FreeBSD/Linux Kernel Cross Reference
sys/netipsec/key.c
1 /* $FreeBSD: releng/7.4/sys/netipsec/key.c 214891 2010-11-06 15:56:44Z bz $ */
2 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * This code is referd to RFC 2367
35 */
36
37 #include "opt_inet.h"
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
40
41 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/lock.h>
46 #include <sys/mutex.h>
47 #include <sys/mbuf.h>
48 #include <sys/domain.h>
49 #include <sys/protosw.h>
50 #include <sys/malloc.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/sysctl.h>
54 #include <sys/errno.h>
55 #include <sys/proc.h>
56 #include <sys/queue.h>
57 #include <sys/refcount.h>
58 #include <sys/syslog.h>
59
60 #include <net/if.h>
61 #include <net/route.h>
62 #include <net/raw_cb.h>
63
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/ip.h>
67 #include <netinet/in_var.h>
68
69 #ifdef INET6
70 #include <netinet/ip6.h>
71 #include <netinet6/in6_var.h>
72 #include <netinet6/ip6_var.h>
73 #endif /* INET6 */
74
75 #ifdef INET
76 #include <netinet/in_pcb.h>
77 #endif
78 #ifdef INET6
79 #include <netinet6/in6_pcb.h>
80 #endif /* INET6 */
81
82 #include <net/pfkeyv2.h>
83 #include <netipsec/keydb.h>
84 #include <netipsec/key.h>
85 #include <netipsec/keysock.h>
86 #include <netipsec/key_debug.h>
87
88 #include <netipsec/ipsec.h>
89 #ifdef INET6
90 #include <netipsec/ipsec6.h>
91 #endif
92
93 #include <netipsec/xform.h>
94
95 #include <machine/stdarg.h>
96
97 /* randomness */
98 #include <sys/random.h>
99
100 #define FULLMASK 0xff
101 #define _BITS(bytes) ((bytes) << 3)
102
103 /*
104 * Note on SA reference counting:
105 * - SAs that are not in DEAD state will have (total external reference + 1)
106 * following value in reference count field. they cannot be freed and are
107 * referenced from SA header.
108 * - SAs that are in DEAD state will have (total external reference)
109 * in reference count field. they are ready to be freed. reference from
110 * SA header will be removed in key_delsav(), when the reference count
111 * field hits 0 (= no external reference other than from SA header.
112 */
113
114 u_int32_t key_debug_level = 0;
115 static u_int key_spi_trycnt = 1000;
116 static u_int32_t key_spi_minval = 0x100;
117 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */
118 static u_int32_t policy_id = 0;
119 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/
120 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/
121 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/
122 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/
123 static int key_preferred_oldsa = 1; /* preferred old sa rather than new sa.*/
124
125 static u_int32_t acq_seq = 0;
126
127 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */
128 static struct mtx sptree_lock;
129 #define SPTREE_LOCK_INIT() \
130 mtx_init(&sptree_lock, "sptree", \
131 "fast ipsec security policy database", MTX_DEF)
132 #define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock)
133 #define SPTREE_LOCK() mtx_lock(&sptree_lock)
134 #define SPTREE_UNLOCK() mtx_unlock(&sptree_lock)
135 #define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED)
136
137 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */
138 static struct mtx sahtree_lock;
139 #define SAHTREE_LOCK_INIT() \
140 mtx_init(&sahtree_lock, "sahtree", \
141 "fast ipsec security association database", MTX_DEF)
142 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock)
143 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock)
144 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock)
145 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED)
146
147 /* registed list */
148 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
149 static struct mtx regtree_lock;
150 #define REGTREE_LOCK_INIT() \
151 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF)
152 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock)
153 #define REGTREE_LOCK() mtx_lock(®tree_lock)
154 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock)
155 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED)
156
157 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */
158 static struct mtx acq_lock;
159 #define ACQ_LOCK_INIT() \
160 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF)
161 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock)
162 #define ACQ_LOCK() mtx_lock(&acq_lock)
163 #define ACQ_UNLOCK() mtx_unlock(&acq_lock)
164 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED)
165
166 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */
167 static struct mtx spacq_lock;
168 #define SPACQ_LOCK_INIT() \
169 mtx_init(&spacq_lock, "spacqtree", \
170 "fast ipsec security policy acquire list", MTX_DEF)
171 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock)
172 #define SPACQ_LOCK() mtx_lock(&spacq_lock)
173 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock)
174 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED)
175
176 /* search order for SAs */
177 static const u_int saorder_state_valid_prefer_old[] = {
178 SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
179 };
180 static const u_int saorder_state_valid_prefer_new[] = {
181 SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
182 };
183 static u_int saorder_state_alive[] = {
184 /* except DEAD */
185 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
186 };
187 static u_int saorder_state_any[] = {
188 SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
189 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
190 };
191
192 static const int minsize[] = {
193 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
194 sizeof(struct sadb_sa), /* SADB_EXT_SA */
195 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
196 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
197 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
198 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
199 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
200 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
201 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
202 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
203 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
204 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
205 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
206 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
207 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
208 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
209 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
210 0, /* SADB_X_EXT_KMPRIVATE */
211 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
212 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
213 };
214 static const int maxsize[] = {
215 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
216 sizeof(struct sadb_sa), /* SADB_EXT_SA */
217 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
220 0, /* SADB_EXT_ADDRESS_SRC */
221 0, /* SADB_EXT_ADDRESS_DST */
222 0, /* SADB_EXT_ADDRESS_PROXY */
223 0, /* SADB_EXT_KEY_AUTH */
224 0, /* SADB_EXT_KEY_ENCRYPT */
225 0, /* SADB_EXT_IDENTITY_SRC */
226 0, /* SADB_EXT_IDENTITY_DST */
227 0, /* SADB_EXT_SENSITIVITY */
228 0, /* SADB_EXT_PROPOSAL */
229 0, /* SADB_EXT_SUPPORTED_AUTH */
230 0, /* SADB_EXT_SUPPORTED_ENCRYPT */
231 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
232 0, /* SADB_X_EXT_KMPRIVATE */
233 0, /* SADB_X_EXT_POLICY */
234 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
235 };
236
237 static int ipsec_esp_keymin = 256;
238 static int ipsec_esp_auth = 0;
239 static int ipsec_ah_keymin = 128;
240
241 #ifdef SYSCTL_DECL
242 SYSCTL_DECL(_net_key);
243 #endif
244
245 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \
246 &key_debug_level, 0, "");
247
248 /* max count of trial for the decision of spi value */
249 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \
250 &key_spi_trycnt, 0, "");
251
252 /* minimum spi value to allocate automatically. */
253 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \
254 &key_spi_minval, 0, "");
255
256 /* maximun spi value to allocate automatically. */
257 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \
258 &key_spi_maxval, 0, "");
259
260 /* interval to initialize randseed */
261 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \
262 &key_int_random, 0, "");
263
264 /* lifetime for larval SA */
265 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \
266 &key_larval_lifetime, 0, "");
267
268 /* counter for blocking to send SADB_ACQUIRE to IKEd */
269 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \
270 &key_blockacq_count, 0, "");
271
272 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
273 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \
274 &key_blockacq_lifetime, 0, "");
275
276 /* ESP auth */
277 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \
278 &ipsec_esp_auth, 0, "");
279
280 /* minimum ESP key length */
281 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \
282 &ipsec_esp_keymin, 0, "");
283
284 /* minimum AH key length */
285 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \
286 &ipsec_ah_keymin, 0, "");
287
288 /* perfered old SA rather than new SA */
289 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa, CTLFLAG_RW,\
290 &key_preferred_oldsa, 0, "");
291
292 #define __LIST_CHAINED(elm) \
293 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
294 #define LIST_INSERT_TAIL(head, elm, type, field) \
295 do {\
296 struct type *curelm = LIST_FIRST(head); \
297 if (curelm == NULL) {\
298 LIST_INSERT_HEAD(head, elm, field); \
299 } else { \
300 while (LIST_NEXT(curelm, field)) \
301 curelm = LIST_NEXT(curelm, field);\
302 LIST_INSERT_AFTER(curelm, elm, field);\
303 }\
304 } while (0)
305
306 #define KEY_CHKSASTATE(head, sav, name) \
307 do { \
308 if ((head) != (sav)) { \
309 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \
310 (name), (head), (sav))); \
311 continue; \
312 } \
313 } while (0)
314
315 #define KEY_CHKSPDIR(head, sp, name) \
316 do { \
317 if ((head) != (sp)) { \
318 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \
319 "anyway continue.\n", \
320 (name), (head), (sp))); \
321 } \
322 } while (0)
323
324 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association");
325 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head");
326 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy");
327 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request");
328 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous");
329 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire");
330 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire");
331
332 /*
333 * set parameters into secpolicyindex buffer.
334 * Must allocate secpolicyindex buffer passed to this function.
335 */
336 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
337 do { \
338 bzero((idx), sizeof(struct secpolicyindex)); \
339 (idx)->dir = (_dir); \
340 (idx)->prefs = (ps); \
341 (idx)->prefd = (pd); \
342 (idx)->ul_proto = (ulp); \
343 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
344 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
345 } while (0)
346
347 /*
348 * set parameters into secasindex buffer.
349 * Must allocate secasindex buffer before calling this function.
350 */
351 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
352 do { \
353 bzero((idx), sizeof(struct secasindex)); \
354 (idx)->proto = (p); \
355 (idx)->mode = (m); \
356 (idx)->reqid = (r); \
357 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
358 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
359 } while (0)
360
361 /* key statistics */
362 struct _keystat {
363 u_long getspi_count; /* the avarage of count to try to get new SPI */
364 } keystat;
365
366 struct sadb_msghdr {
367 struct sadb_msg *msg;
368 struct sadb_ext *ext[SADB_EXT_MAX + 1];
369 int extoff[SADB_EXT_MAX + 1];
370 int extlen[SADB_EXT_MAX + 1];
371 };
372
373 static struct secasvar *key_allocsa_policy __P((const struct secasindex *));
374 static void key_freesp_so __P((struct secpolicy **));
375 static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int));
376 static void key_delsp __P((struct secpolicy *));
377 static struct secpolicy *key_getsp __P((struct secpolicyindex *));
378 static void _key_delsp(struct secpolicy *sp);
379 static struct secpolicy *key_getspbyid __P((u_int32_t));
380 static u_int32_t key_newreqid __P((void));
381 static struct mbuf *key_gather_mbuf __P((struct mbuf *,
382 const struct sadb_msghdr *, int, int, ...));
383 static int key_spdadd __P((struct socket *, struct mbuf *,
384 const struct sadb_msghdr *));
385 static u_int32_t key_getnewspid __P((void));
386 static int key_spddelete __P((struct socket *, struct mbuf *,
387 const struct sadb_msghdr *));
388 static int key_spddelete2 __P((struct socket *, struct mbuf *,
389 const struct sadb_msghdr *));
390 static int key_spdget __P((struct socket *, struct mbuf *,
391 const struct sadb_msghdr *));
392 static int key_spdflush __P((struct socket *, struct mbuf *,
393 const struct sadb_msghdr *));
394 static int key_spddump __P((struct socket *, struct mbuf *,
395 const struct sadb_msghdr *));
396 static struct mbuf *key_setdumpsp __P((struct secpolicy *,
397 u_int8_t, u_int32_t, u_int32_t));
398 static u_int key_getspreqmsglen __P((struct secpolicy *));
399 static int key_spdexpire __P((struct secpolicy *));
400 static struct secashead *key_newsah __P((struct secasindex *));
401 static void key_delsah __P((struct secashead *));
402 static struct secasvar *key_newsav __P((struct mbuf *,
403 const struct sadb_msghdr *, struct secashead *, int *,
404 const char*, int));
405 #define KEY_NEWSAV(m, sadb, sah, e) \
406 key_newsav(m, sadb, sah, e, __FILE__, __LINE__)
407 static void key_delsav __P((struct secasvar *));
408 static struct secashead *key_getsah __P((struct secasindex *));
409 static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t));
410 static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t));
411 static int key_setsaval __P((struct secasvar *, struct mbuf *,
412 const struct sadb_msghdr *));
413 static int key_mature __P((struct secasvar *));
414 static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t,
415 u_int8_t, u_int32_t, u_int32_t));
416 static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t,
417 u_int32_t, pid_t, u_int16_t));
418 static struct mbuf *key_setsadbsa __P((struct secasvar *));
419 static struct mbuf *key_setsadbaddr __P((u_int16_t,
420 const struct sockaddr *, u_int8_t, u_int16_t));
421 static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t));
422 static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t,
423 u_int32_t));
424 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int,
425 struct malloc_type *);
426 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src,
427 struct malloc_type *type);
428 #ifdef INET6
429 static int key_ismyaddr6 __P((struct sockaddr_in6 *));
430 #endif
431
432 /* flags for key_cmpsaidx() */
433 #define CMP_HEAD 1 /* protocol, addresses. */
434 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
435 #define CMP_REQID 3 /* additionally HEAD, reaid. */
436 #define CMP_EXACTLY 4 /* all elements. */
437 static int key_cmpsaidx
438 __P((const struct secasindex *, const struct secasindex *, int));
439
440 static int key_cmpspidx_exactly
441 __P((struct secpolicyindex *, struct secpolicyindex *));
442 static int key_cmpspidx_withmask
443 __P((struct secpolicyindex *, struct secpolicyindex *));
444 static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int));
445 static int key_bbcmp __P((const void *, const void *, u_int));
446 static u_int16_t key_satype2proto __P((u_int8_t));
447 static u_int8_t key_proto2satype __P((u_int16_t));
448
449 static int key_getspi __P((struct socket *, struct mbuf *,
450 const struct sadb_msghdr *));
451 static u_int32_t key_do_getnewspi __P((struct sadb_spirange *,
452 struct secasindex *));
453 static int key_update __P((struct socket *, struct mbuf *,
454 const struct sadb_msghdr *));
455 #ifdef IPSEC_DOSEQCHECK
456 static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t));
457 #endif
458 static int key_add __P((struct socket *, struct mbuf *,
459 const struct sadb_msghdr *));
460 static int key_setident __P((struct secashead *, struct mbuf *,
461 const struct sadb_msghdr *));
462 static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *,
463 const struct sadb_msghdr *));
464 static int key_delete __P((struct socket *, struct mbuf *,
465 const struct sadb_msghdr *));
466 static int key_get __P((struct socket *, struct mbuf *,
467 const struct sadb_msghdr *));
468
469 static void key_getcomb_setlifetime __P((struct sadb_comb *));
470 static struct mbuf *key_getcomb_esp __P((void));
471 static struct mbuf *key_getcomb_ah __P((void));
472 static struct mbuf *key_getcomb_ipcomp __P((void));
473 static struct mbuf *key_getprop __P((const struct secasindex *));
474
475 static int key_acquire __P((const struct secasindex *, struct secpolicy *));
476 static struct secacq *key_newacq __P((const struct secasindex *));
477 static struct secacq *key_getacq __P((const struct secasindex *));
478 static struct secacq *key_getacqbyseq __P((u_int32_t));
479 static struct secspacq *key_newspacq __P((struct secpolicyindex *));
480 static struct secspacq *key_getspacq __P((struct secpolicyindex *));
481 static int key_acquire2 __P((struct socket *, struct mbuf *,
482 const struct sadb_msghdr *));
483 static int key_register __P((struct socket *, struct mbuf *,
484 const struct sadb_msghdr *));
485 static int key_expire __P((struct secasvar *));
486 static int key_flush __P((struct socket *, struct mbuf *,
487 const struct sadb_msghdr *));
488 static int key_dump __P((struct socket *, struct mbuf *,
489 const struct sadb_msghdr *));
490 static int key_promisc __P((struct socket *, struct mbuf *,
491 const struct sadb_msghdr *));
492 static int key_senderror __P((struct socket *, struct mbuf *, int));
493 static int key_validate_ext __P((const struct sadb_ext *, int));
494 static int key_align __P((struct mbuf *, struct sadb_msghdr *));
495 static struct mbuf *key_setlifetime(struct seclifetime *src,
496 u_int16_t exttype);
497 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype);
498
499 #if 0
500 static const char *key_getfqdn __P((void));
501 static const char *key_getuserfqdn __P((void));
502 #endif
503 static void key_sa_chgstate __P((struct secasvar *, u_int8_t));
504 static struct mbuf *key_alloc_mbuf __P((int));
505
506 static __inline void
507 sa_initref(struct secasvar *sav)
508 {
509
510 refcount_init(&sav->refcnt, 1);
511 }
512 static __inline void
513 sa_addref(struct secasvar *sav)
514 {
515
516 refcount_acquire(&sav->refcnt);
517 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow"));
518 }
519 static __inline int
520 sa_delref(struct secasvar *sav)
521 {
522
523 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow"));
524 return (refcount_release(&sav->refcnt));
525 }
526
527 #define SP_ADDREF(p) do { \
528 (p)->refcnt++; \
529 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \
530 } while (0)
531 #define SP_DELREF(p) do { \
532 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \
533 (p)->refcnt--; \
534 } while (0)
535
536
537 /*
538 * Update the refcnt while holding the SPTREE lock.
539 */
540 void
541 key_addref(struct secpolicy *sp)
542 {
543 SPTREE_LOCK();
544 SP_ADDREF(sp);
545 SPTREE_UNLOCK();
546 }
547
548 /*
549 * Return 0 when there are known to be no SP's for the specified
550 * direction. Otherwise return 1. This is used by IPsec code
551 * to optimize performance.
552 */
553 int
554 key_havesp(u_int dir)
555 {
556 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
557 LIST_FIRST(&sptree[dir]) != NULL : 1);
558 }
559
560 /* %%% IPsec policy management */
561 /*
562 * allocating a SP for OUTBOUND or INBOUND packet.
563 * Must call key_freesp() later.
564 * OUT: NULL: not found
565 * others: found and return the pointer.
566 */
567 struct secpolicy *
568 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag)
569 {
570 struct secpolicy *sp;
571
572 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
573 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
574 ("invalid direction %u", dir));
575
576 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
577 printf("DP %s from %s:%u\n", __func__, where, tag));
578
579 /* get a SP entry */
580 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
581 printf("*** objects\n");
582 kdebug_secpolicyindex(spidx));
583
584 SPTREE_LOCK();
585 LIST_FOREACH(sp, &sptree[dir], chain) {
586 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
587 printf("*** in SPD\n");
588 kdebug_secpolicyindex(&sp->spidx));
589
590 if (sp->state == IPSEC_SPSTATE_DEAD)
591 continue;
592 if (key_cmpspidx_withmask(&sp->spidx, spidx))
593 goto found;
594 }
595 sp = NULL;
596 found:
597 if (sp) {
598 /* sanity check */
599 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__);
600
601 /* found a SPD entry */
602 sp->lastused = time_second;
603 SP_ADDREF(sp);
604 }
605 SPTREE_UNLOCK();
606
607 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
608 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
609 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
610 return sp;
611 }
612
613 /*
614 * allocating a SP for OUTBOUND or INBOUND packet.
615 * Must call key_freesp() later.
616 * OUT: NULL: not found
617 * others: found and return the pointer.
618 */
619 struct secpolicy *
620 key_allocsp2(u_int32_t spi,
621 union sockaddr_union *dst,
622 u_int8_t proto,
623 u_int dir,
624 const char* where, int tag)
625 {
626 struct secpolicy *sp;
627
628 IPSEC_ASSERT(dst != NULL, ("null dst"));
629 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
630 ("invalid direction %u", dir));
631
632 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
633 printf("DP %s from %s:%u\n", __func__, where, tag));
634
635 /* get a SP entry */
636 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
637 printf("*** objects\n");
638 printf("spi %u proto %u dir %u\n", spi, proto, dir);
639 kdebug_sockaddr(&dst->sa));
640
641 SPTREE_LOCK();
642 LIST_FOREACH(sp, &sptree[dir], chain) {
643 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
644 printf("*** in SPD\n");
645 kdebug_secpolicyindex(&sp->spidx));
646
647 if (sp->state == IPSEC_SPSTATE_DEAD)
648 continue;
649 /* compare simple values, then dst address */
650 if (sp->spidx.ul_proto != proto)
651 continue;
652 /* NB: spi's must exist and match */
653 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi)
654 continue;
655 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0)
656 goto found;
657 }
658 sp = NULL;
659 found:
660 if (sp) {
661 /* sanity check */
662 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__);
663
664 /* found a SPD entry */
665 sp->lastused = time_second;
666 SP_ADDREF(sp);
667 }
668 SPTREE_UNLOCK();
669
670 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
671 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
672 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
673 return sp;
674 }
675
676 /*
677 * return a policy that matches this particular inbound packet.
678 * XXX slow
679 */
680 struct secpolicy *
681 key_gettunnel(const struct sockaddr *osrc,
682 const struct sockaddr *odst,
683 const struct sockaddr *isrc,
684 const struct sockaddr *idst,
685 const char* where, int tag)
686 {
687 struct secpolicy *sp;
688 const int dir = IPSEC_DIR_INBOUND;
689 struct ipsecrequest *r1, *r2, *p;
690 struct secpolicyindex spidx;
691
692 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
693 printf("DP %s from %s:%u\n", __func__, where, tag));
694
695 if (isrc->sa_family != idst->sa_family) {
696 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.",
697 __func__, isrc->sa_family, idst->sa_family));
698 sp = NULL;
699 goto done;
700 }
701
702 SPTREE_LOCK();
703 LIST_FOREACH(sp, &sptree[dir], chain) {
704 if (sp->state == IPSEC_SPSTATE_DEAD)
705 continue;
706
707 r1 = r2 = NULL;
708 for (p = sp->req; p; p = p->next) {
709 if (p->saidx.mode != IPSEC_MODE_TUNNEL)
710 continue;
711
712 r1 = r2;
713 r2 = p;
714
715 if (!r1) {
716 /* here we look at address matches only */
717 spidx = sp->spidx;
718 if (isrc->sa_len > sizeof(spidx.src) ||
719 idst->sa_len > sizeof(spidx.dst))
720 continue;
721 bcopy(isrc, &spidx.src, isrc->sa_len);
722 bcopy(idst, &spidx.dst, idst->sa_len);
723 if (!key_cmpspidx_withmask(&sp->spidx, &spidx))
724 continue;
725 } else {
726 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) ||
727 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0))
728 continue;
729 }
730
731 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) ||
732 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0))
733 continue;
734
735 goto found;
736 }
737 }
738 sp = NULL;
739 found:
740 if (sp) {
741 sp->lastused = time_second;
742 SP_ADDREF(sp);
743 }
744 SPTREE_UNLOCK();
745 done:
746 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
747 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__,
748 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
749 return sp;
750 }
751
752 /*
753 * allocating an SA entry for an *OUTBOUND* packet.
754 * checking each request entries in SP, and acquire an SA if need.
755 * OUT: 0: there are valid requests.
756 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
757 */
758 int
759 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx)
760 {
761 u_int level;
762 int error;
763
764 IPSEC_ASSERT(isr != NULL, ("null isr"));
765 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
766 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
767 saidx->mode == IPSEC_MODE_TUNNEL,
768 ("unexpected policy %u", saidx->mode));
769
770 /*
771 * XXX guard against protocol callbacks from the crypto
772 * thread as they reference ipsecrequest.sav which we
773 * temporarily null out below. Need to rethink how we
774 * handle bundled SA's in the callback thread.
775 */
776 IPSECREQUEST_LOCK_ASSERT(isr);
777
778 /* get current level */
779 level = ipsec_get_reqlevel(isr);
780 #if 0
781 /*
782 * We do allocate new SA only if the state of SA in the holder is
783 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest.
784 */
785 if (isr->sav != NULL) {
786 if (isr->sav->sah == NULL)
787 panic("%s: sah is null.\n", __func__);
788 if (isr->sav == (struct secasvar *)LIST_FIRST(
789 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
790 KEY_FREESAV(&isr->sav);
791 isr->sav = NULL;
792 }
793 }
794 #else
795 /*
796 * we free any SA stashed in the IPsec request because a different
797 * SA may be involved each time this request is checked, either
798 * because new SAs are being configured, or this request is
799 * associated with an unconnected datagram socket, or this request
800 * is associated with a system default policy.
801 *
802 * The operation may have negative impact to performance. We may
803 * want to check cached SA carefully, rather than picking new SA
804 * every time.
805 */
806 if (isr->sav != NULL) {
807 KEY_FREESAV(&isr->sav);
808 isr->sav = NULL;
809 }
810 #endif
811
812 /*
813 * new SA allocation if no SA found.
814 * key_allocsa_policy should allocate the oldest SA available.
815 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
816 */
817 if (isr->sav == NULL)
818 isr->sav = key_allocsa_policy(saidx);
819
820 /* When there is SA. */
821 if (isr->sav != NULL) {
822 if (isr->sav->state != SADB_SASTATE_MATURE &&
823 isr->sav->state != SADB_SASTATE_DYING)
824 return EINVAL;
825 return 0;
826 }
827
828 /* there is no SA */
829 error = key_acquire(saidx, isr->sp);
830 if (error != 0) {
831 /* XXX What should I do ? */
832 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n",
833 __func__, error));
834 return error;
835 }
836
837 if (level != IPSEC_LEVEL_REQUIRE) {
838 /* XXX sigh, the interface to this routine is botched */
839 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA"));
840 return 0;
841 } else {
842 return ENOENT;
843 }
844 }
845
846 /*
847 * allocating a SA for policy entry from SAD.
848 * NOTE: searching SAD of aliving state.
849 * OUT: NULL: not found.
850 * others: found and return the pointer.
851 */
852 static struct secasvar *
853 key_allocsa_policy(const struct secasindex *saidx)
854 {
855 #define N(a) _ARRAYLEN(a)
856 struct secashead *sah;
857 struct secasvar *sav;
858 u_int stateidx, arraysize;
859 const u_int *state_valid;
860
861 SAHTREE_LOCK();
862 LIST_FOREACH(sah, &sahtree, chain) {
863 if (sah->state == SADB_SASTATE_DEAD)
864 continue;
865 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) {
866 if (key_preferred_oldsa) {
867 state_valid = saorder_state_valid_prefer_old;
868 arraysize = N(saorder_state_valid_prefer_old);
869 } else {
870 state_valid = saorder_state_valid_prefer_new;
871 arraysize = N(saorder_state_valid_prefer_new);
872 }
873 SAHTREE_UNLOCK();
874 goto found;
875 }
876 }
877 SAHTREE_UNLOCK();
878
879 return NULL;
880
881 found:
882 /* search valid state */
883 for (stateidx = 0; stateidx < arraysize; stateidx++) {
884 sav = key_do_allocsa_policy(sah, state_valid[stateidx]);
885 if (sav != NULL)
886 return sav;
887 }
888
889 return NULL;
890 #undef N
891 }
892
893 /*
894 * searching SAD with direction, protocol, mode and state.
895 * called by key_allocsa_policy().
896 * OUT:
897 * NULL : not found
898 * others : found, pointer to a SA.
899 */
900 static struct secasvar *
901 key_do_allocsa_policy(struct secashead *sah, u_int state)
902 {
903 struct secasvar *sav, *nextsav, *candidate, *d;
904
905 /* initilize */
906 candidate = NULL;
907
908 SAHTREE_LOCK();
909 for (sav = LIST_FIRST(&sah->savtree[state]);
910 sav != NULL;
911 sav = nextsav) {
912
913 nextsav = LIST_NEXT(sav, chain);
914
915 /* sanity check */
916 KEY_CHKSASTATE(sav->state, state, __func__);
917
918 /* initialize */
919 if (candidate == NULL) {
920 candidate = sav;
921 continue;
922 }
923
924 /* Which SA is the better ? */
925
926 IPSEC_ASSERT(candidate->lft_c != NULL,
927 ("null candidate lifetime"));
928 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime"));
929
930 /* What the best method is to compare ? */
931 if (key_preferred_oldsa) {
932 if (candidate->lft_c->addtime >
933 sav->lft_c->addtime) {
934 candidate = sav;
935 }
936 continue;
937 /*NOTREACHED*/
938 }
939
940 /* preferred new sa rather than old sa */
941 if (candidate->lft_c->addtime <
942 sav->lft_c->addtime) {
943 d = candidate;
944 candidate = sav;
945 } else
946 d = sav;
947
948 /*
949 * prepared to delete the SA when there is more
950 * suitable candidate and the lifetime of the SA is not
951 * permanent.
952 */
953 if (d->lft_h->addtime != 0) {
954 struct mbuf *m, *result;
955 u_int8_t satype;
956
957 key_sa_chgstate(d, SADB_SASTATE_DEAD);
958
959 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count"));
960
961 satype = key_proto2satype(d->sah->saidx.proto);
962 if (satype == 0)
963 goto msgfail;
964
965 m = key_setsadbmsg(SADB_DELETE, 0,
966 satype, 0, 0, d->refcnt - 1);
967 if (!m)
968 goto msgfail;
969 result = m;
970
971 /* set sadb_address for saidx's. */
972 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
973 &d->sah->saidx.src.sa,
974 d->sah->saidx.src.sa.sa_len << 3,
975 IPSEC_ULPROTO_ANY);
976 if (!m)
977 goto msgfail;
978 m_cat(result, m);
979
980 /* set sadb_address for saidx's. */
981 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
982 &d->sah->saidx.dst.sa,
983 d->sah->saidx.dst.sa.sa_len << 3,
984 IPSEC_ULPROTO_ANY);
985 if (!m)
986 goto msgfail;
987 m_cat(result, m);
988
989 /* create SA extension */
990 m = key_setsadbsa(d);
991 if (!m)
992 goto msgfail;
993 m_cat(result, m);
994
995 if (result->m_len < sizeof(struct sadb_msg)) {
996 result = m_pullup(result,
997 sizeof(struct sadb_msg));
998 if (result == NULL)
999 goto msgfail;
1000 }
1001
1002 result->m_pkthdr.len = 0;
1003 for (m = result; m; m = m->m_next)
1004 result->m_pkthdr.len += m->m_len;
1005 mtod(result, struct sadb_msg *)->sadb_msg_len =
1006 PFKEY_UNIT64(result->m_pkthdr.len);
1007
1008 if (key_sendup_mbuf(NULL, result,
1009 KEY_SENDUP_REGISTERED))
1010 goto msgfail;
1011 msgfail:
1012 KEY_FREESAV(&d);
1013 }
1014 }
1015 if (candidate) {
1016 sa_addref(candidate);
1017 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1018 printf("DP %s cause refcnt++:%d SA:%p\n",
1019 __func__, candidate->refcnt, candidate));
1020 }
1021 SAHTREE_UNLOCK();
1022
1023 return candidate;
1024 }
1025
1026 /*
1027 * allocating a usable SA entry for a *INBOUND* packet.
1028 * Must call key_freesav() later.
1029 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
1030 * NULL: not found, or error occured.
1031 *
1032 * In the comparison, no source address is used--for RFC2401 conformance.
1033 * To quote, from section 4.1:
1034 * A security association is uniquely identified by a triple consisting
1035 * of a Security Parameter Index (SPI), an IP Destination Address, and a
1036 * security protocol (AH or ESP) identifier.
1037 * Note that, however, we do need to keep source address in IPsec SA.
1038 * IKE specification and PF_KEY specification do assume that we
1039 * keep source address in IPsec SA. We see a tricky situation here.
1040 */
1041 struct secasvar *
1042 key_allocsa(
1043 union sockaddr_union *dst,
1044 u_int proto,
1045 u_int32_t spi,
1046 const char* where, int tag)
1047 {
1048 struct secashead *sah;
1049 struct secasvar *sav;
1050 u_int stateidx, arraysize, state;
1051 const u_int *saorder_state_valid;
1052
1053 IPSEC_ASSERT(dst != NULL, ("null dst address"));
1054
1055 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1056 printf("DP %s from %s:%u\n", __func__, where, tag));
1057
1058 /*
1059 * searching SAD.
1060 * XXX: to be checked internal IP header somewhere. Also when
1061 * IPsec tunnel packet is received. But ESP tunnel mode is
1062 * encrypted so we can't check internal IP header.
1063 */
1064 SAHTREE_LOCK();
1065 if (key_preferred_oldsa) {
1066 saorder_state_valid = saorder_state_valid_prefer_old;
1067 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old);
1068 } else {
1069 saorder_state_valid = saorder_state_valid_prefer_new;
1070 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new);
1071 }
1072 LIST_FOREACH(sah, &sahtree, chain) {
1073 /* search valid state */
1074 for (stateidx = 0; stateidx < arraysize; stateidx++) {
1075 state = saorder_state_valid[stateidx];
1076 LIST_FOREACH(sav, &sah->savtree[state], chain) {
1077 /* sanity check */
1078 KEY_CHKSASTATE(sav->state, state, __func__);
1079 /* do not return entries w/ unusable state */
1080 if (sav->state != SADB_SASTATE_MATURE &&
1081 sav->state != SADB_SASTATE_DYING)
1082 continue;
1083 if (proto != sav->sah->saidx.proto)
1084 continue;
1085 if (spi != sav->spi)
1086 continue;
1087 #if 0 /* don't check src */
1088 /* check src address */
1089 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0)
1090 continue;
1091 #endif
1092 /* check dst address */
1093 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0)
1094 continue;
1095 sa_addref(sav);
1096 goto done;
1097 }
1098 }
1099 }
1100 sav = NULL;
1101 done:
1102 SAHTREE_UNLOCK();
1103
1104 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1105 printf("DP %s return SA:%p; refcnt %u\n", __func__,
1106 sav, sav ? sav->refcnt : 0));
1107 return sav;
1108 }
1109
1110 /*
1111 * Must be called after calling key_allocsp().
1112 * For both the packet without socket and key_freeso().
1113 */
1114 void
1115 _key_freesp(struct secpolicy **spp, const char* where, int tag)
1116 {
1117 struct secpolicy *sp = *spp;
1118
1119 IPSEC_ASSERT(sp != NULL, ("null sp"));
1120
1121 SPTREE_LOCK();
1122 SP_DELREF(sp);
1123
1124 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1125 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n",
1126 __func__, sp, sp->id, where, tag, sp->refcnt));
1127
1128 if (sp->refcnt == 0) {
1129 *spp = NULL;
1130 key_delsp(sp);
1131 }
1132 SPTREE_UNLOCK();
1133 }
1134
1135 /*
1136 * Must be called after calling key_allocsp().
1137 * For the packet with socket.
1138 */
1139 void
1140 key_freeso(struct socket *so)
1141 {
1142 IPSEC_ASSERT(so != NULL, ("null so"));
1143
1144 switch (so->so_proto->pr_domain->dom_family) {
1145 #if defined(INET) || defined(INET6)
1146 #ifdef INET
1147 case PF_INET:
1148 #endif
1149 #ifdef INET6
1150 case PF_INET6:
1151 #endif
1152 {
1153 struct inpcb *pcb = sotoinpcb(so);
1154
1155 /* Does it have a PCB ? */
1156 if (pcb == NULL)
1157 return;
1158 key_freesp_so(&pcb->inp_sp->sp_in);
1159 key_freesp_so(&pcb->inp_sp->sp_out);
1160 }
1161 break;
1162 #endif /* INET || INET6 */
1163 default:
1164 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n",
1165 __func__, so->so_proto->pr_domain->dom_family));
1166 return;
1167 }
1168 }
1169
1170 static void
1171 key_freesp_so(struct secpolicy **sp)
1172 {
1173 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp"));
1174
1175 if ((*sp)->policy == IPSEC_POLICY_ENTRUST ||
1176 (*sp)->policy == IPSEC_POLICY_BYPASS)
1177 return;
1178
1179 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC,
1180 ("invalid policy %u", (*sp)->policy));
1181 KEY_FREESP(sp);
1182 }
1183
1184 /*
1185 * Must be called after calling key_allocsa().
1186 * This function is called by key_freesp() to free some SA allocated
1187 * for a policy.
1188 */
1189 void
1190 key_freesav(struct secasvar **psav, const char* where, int tag)
1191 {
1192 struct secasvar *sav = *psav;
1193
1194 IPSEC_ASSERT(sav != NULL, ("null sav"));
1195
1196 if (sa_delref(sav)) {
1197 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1198 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
1199 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt));
1200 *psav = NULL;
1201 key_delsav(sav);
1202 } else {
1203 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1204 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
1205 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt));
1206 }
1207 }
1208
1209 /* %%% SPD management */
1210 /*
1211 * free security policy entry.
1212 */
1213 static void
1214 key_delsp(struct secpolicy *sp)
1215 {
1216 struct ipsecrequest *isr, *nextisr;
1217
1218 IPSEC_ASSERT(sp != NULL, ("null sp"));
1219 SPTREE_LOCK_ASSERT();
1220
1221 sp->state = IPSEC_SPSTATE_DEAD;
1222
1223 IPSEC_ASSERT(sp->refcnt == 0,
1224 ("SP with references deleted (refcnt %u)", sp->refcnt));
1225
1226 /* remove from SP index */
1227 if (__LIST_CHAINED(sp))
1228 LIST_REMOVE(sp, chain);
1229
1230 for (isr = sp->req; isr != NULL; isr = nextisr) {
1231 if (isr->sav != NULL) {
1232 KEY_FREESAV(&isr->sav);
1233 isr->sav = NULL;
1234 }
1235
1236 nextisr = isr->next;
1237 ipsec_delisr(isr);
1238 }
1239 _key_delsp(sp);
1240 }
1241
1242 /*
1243 * search SPD
1244 * OUT: NULL : not found
1245 * others : found, pointer to a SP.
1246 */
1247 static struct secpolicy *
1248 key_getsp(struct secpolicyindex *spidx)
1249 {
1250 struct secpolicy *sp;
1251
1252 IPSEC_ASSERT(spidx != NULL, ("null spidx"));
1253
1254 SPTREE_LOCK();
1255 LIST_FOREACH(sp, &sptree[spidx->dir], chain) {
1256 if (sp->state == IPSEC_SPSTATE_DEAD)
1257 continue;
1258 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1259 SP_ADDREF(sp);
1260 break;
1261 }
1262 }
1263 SPTREE_UNLOCK();
1264
1265 return sp;
1266 }
1267
1268 /*
1269 * get SP by index.
1270 * OUT: NULL : not found
1271 * others : found, pointer to a SP.
1272 */
1273 static struct secpolicy *
1274 key_getspbyid(u_int32_t id)
1275 {
1276 struct secpolicy *sp;
1277
1278 SPTREE_LOCK();
1279 LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) {
1280 if (sp->state == IPSEC_SPSTATE_DEAD)
1281 continue;
1282 if (sp->id == id) {
1283 SP_ADDREF(sp);
1284 goto done;
1285 }
1286 }
1287
1288 LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) {
1289 if (sp->state == IPSEC_SPSTATE_DEAD)
1290 continue;
1291 if (sp->id == id) {
1292 SP_ADDREF(sp);
1293 goto done;
1294 }
1295 }
1296 done:
1297 SPTREE_UNLOCK();
1298
1299 return sp;
1300 }
1301
1302 struct secpolicy *
1303 key_newsp(const char* where, int tag)
1304 {
1305 struct secpolicy *newsp = NULL;
1306
1307 newsp = (struct secpolicy *)
1308 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO);
1309 if (newsp) {
1310 SECPOLICY_LOCK_INIT(newsp);
1311 newsp->refcnt = 1;
1312 newsp->req = NULL;
1313 }
1314
1315 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1316 printf("DP %s from %s:%u return SP:%p\n", __func__,
1317 where, tag, newsp));
1318 return newsp;
1319 }
1320
1321 static void
1322 _key_delsp(struct secpolicy *sp)
1323 {
1324 SECPOLICY_LOCK_DESTROY(sp);
1325 free(sp, M_IPSEC_SP);
1326 }
1327
1328 /*
1329 * create secpolicy structure from sadb_x_policy structure.
1330 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
1331 * so must be set properly later.
1332 */
1333 struct secpolicy *
1334 key_msg2sp(xpl0, len, error)
1335 struct sadb_x_policy *xpl0;
1336 size_t len;
1337 int *error;
1338 {
1339 struct secpolicy *newsp;
1340
1341 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0"));
1342 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len));
1343
1344 if (len != PFKEY_EXTLEN(xpl0)) {
1345 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__));
1346 *error = EINVAL;
1347 return NULL;
1348 }
1349
1350 if ((newsp = KEY_NEWSP()) == NULL) {
1351 *error = ENOBUFS;
1352 return NULL;
1353 }
1354
1355 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1356 newsp->policy = xpl0->sadb_x_policy_type;
1357
1358 /* check policy */
1359 switch (xpl0->sadb_x_policy_type) {
1360 case IPSEC_POLICY_DISCARD:
1361 case IPSEC_POLICY_NONE:
1362 case IPSEC_POLICY_ENTRUST:
1363 case IPSEC_POLICY_BYPASS:
1364 newsp->req = NULL;
1365 break;
1366
1367 case IPSEC_POLICY_IPSEC:
1368 {
1369 int tlen;
1370 struct sadb_x_ipsecrequest *xisr;
1371 struct ipsecrequest **p_isr = &newsp->req;
1372
1373 /* validity check */
1374 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1375 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n",
1376 __func__));
1377 KEY_FREESP(&newsp);
1378 *error = EINVAL;
1379 return NULL;
1380 }
1381
1382 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1383 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1384
1385 while (tlen > 0) {
1386 /* length check */
1387 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
1388 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest "
1389 "length.\n", __func__));
1390 KEY_FREESP(&newsp);
1391 *error = EINVAL;
1392 return NULL;
1393 }
1394
1395 /* allocate request buffer */
1396 /* NB: data structure is zero'd */
1397 *p_isr = ipsec_newisr();
1398 if ((*p_isr) == NULL) {
1399 ipseclog((LOG_DEBUG,
1400 "%s: No more memory.\n", __func__));
1401 KEY_FREESP(&newsp);
1402 *error = ENOBUFS;
1403 return NULL;
1404 }
1405
1406 /* set values */
1407 switch (xisr->sadb_x_ipsecrequest_proto) {
1408 case IPPROTO_ESP:
1409 case IPPROTO_AH:
1410 case IPPROTO_IPCOMP:
1411 break;
1412 default:
1413 ipseclog((LOG_DEBUG,
1414 "%s: invalid proto type=%u\n", __func__,
1415 xisr->sadb_x_ipsecrequest_proto));
1416 KEY_FREESP(&newsp);
1417 *error = EPROTONOSUPPORT;
1418 return NULL;
1419 }
1420 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;
1421
1422 switch (xisr->sadb_x_ipsecrequest_mode) {
1423 case IPSEC_MODE_TRANSPORT:
1424 case IPSEC_MODE_TUNNEL:
1425 break;
1426 case IPSEC_MODE_ANY:
1427 default:
1428 ipseclog((LOG_DEBUG,
1429 "%s: invalid mode=%u\n", __func__,
1430 xisr->sadb_x_ipsecrequest_mode));
1431 KEY_FREESP(&newsp);
1432 *error = EINVAL;
1433 return NULL;
1434 }
1435 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1436
1437 switch (xisr->sadb_x_ipsecrequest_level) {
1438 case IPSEC_LEVEL_DEFAULT:
1439 case IPSEC_LEVEL_USE:
1440 case IPSEC_LEVEL_REQUIRE:
1441 break;
1442 case IPSEC_LEVEL_UNIQUE:
1443 /* validity check */
1444 /*
1445 * If range violation of reqid, kernel will
1446 * update it, don't refuse it.
1447 */
1448 if (xisr->sadb_x_ipsecrequest_reqid
1449 > IPSEC_MANUAL_REQID_MAX) {
1450 ipseclog((LOG_DEBUG,
1451 "%s: reqid=%d range "
1452 "violation, updated by kernel.\n",
1453 __func__,
1454 xisr->sadb_x_ipsecrequest_reqid));
1455 xisr->sadb_x_ipsecrequest_reqid = 0;
1456 }
1457
1458 /* allocate new reqid id if reqid is zero. */
1459 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1460 u_int32_t reqid;
1461 if ((reqid = key_newreqid()) == 0) {
1462 KEY_FREESP(&newsp);
1463 *error = ENOBUFS;
1464 return NULL;
1465 }
1466 (*p_isr)->saidx.reqid = reqid;
1467 xisr->sadb_x_ipsecrequest_reqid = reqid;
1468 } else {
1469 /* set it for manual keying. */
1470 (*p_isr)->saidx.reqid =
1471 xisr->sadb_x_ipsecrequest_reqid;
1472 }
1473 break;
1474
1475 default:
1476 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n",
1477 __func__,
1478 xisr->sadb_x_ipsecrequest_level));
1479 KEY_FREESP(&newsp);
1480 *error = EINVAL;
1481 return NULL;
1482 }
1483 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level;
1484
1485 /* set IP addresses if there */
1486 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1487 struct sockaddr *paddr;
1488
1489 paddr = (struct sockaddr *)(xisr + 1);
1490
1491 /* validity check */
1492 if (paddr->sa_len
1493 > sizeof((*p_isr)->saidx.src)) {
1494 ipseclog((LOG_DEBUG, "%s: invalid "
1495 "request address length.\n",
1496 __func__));
1497 KEY_FREESP(&newsp);
1498 *error = EINVAL;
1499 return NULL;
1500 }
1501 bcopy(paddr, &(*p_isr)->saidx.src,
1502 paddr->sa_len);
1503
1504 paddr = (struct sockaddr *)((caddr_t)paddr
1505 + paddr->sa_len);
1506
1507 /* validity check */
1508 if (paddr->sa_len
1509 > sizeof((*p_isr)->saidx.dst)) {
1510 ipseclog((LOG_DEBUG, "%s: invalid "
1511 "request address length.\n",
1512 __func__));
1513 KEY_FREESP(&newsp);
1514 *error = EINVAL;
1515 return NULL;
1516 }
1517 bcopy(paddr, &(*p_isr)->saidx.dst,
1518 paddr->sa_len);
1519 }
1520
1521 (*p_isr)->sp = newsp;
1522
1523 /* initialization for the next. */
1524 p_isr = &(*p_isr)->next;
1525 tlen -= xisr->sadb_x_ipsecrequest_len;
1526
1527 /* validity check */
1528 if (tlen < 0) {
1529 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n",
1530 __func__));
1531 KEY_FREESP(&newsp);
1532 *error = EINVAL;
1533 return NULL;
1534 }
1535
1536 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1537 + xisr->sadb_x_ipsecrequest_len);
1538 }
1539 }
1540 break;
1541 default:
1542 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__));
1543 KEY_FREESP(&newsp);
1544 *error = EINVAL;
1545 return NULL;
1546 }
1547
1548 *error = 0;
1549 return newsp;
1550 }
1551
1552 static u_int32_t
1553 key_newreqid()
1554 {
1555 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1556
1557 auto_reqid = (auto_reqid == ~0
1558 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);
1559
1560 /* XXX should be unique check */
1561
1562 return auto_reqid;
1563 }
1564
1565 /*
1566 * copy secpolicy struct to sadb_x_policy structure indicated.
1567 */
1568 struct mbuf *
1569 key_sp2msg(sp)
1570 struct secpolicy *sp;
1571 {
1572 struct sadb_x_policy *xpl;
1573 int tlen;
1574 caddr_t p;
1575 struct mbuf *m;
1576
1577 IPSEC_ASSERT(sp != NULL, ("null policy"));
1578
1579 tlen = key_getspreqmsglen(sp);
1580
1581 m = key_alloc_mbuf(tlen);
1582 if (!m || m->m_next) { /*XXX*/
1583 if (m)
1584 m_freem(m);
1585 return NULL;
1586 }
1587
1588 m->m_len = tlen;
1589 m->m_next = NULL;
1590 xpl = mtod(m, struct sadb_x_policy *);
1591 bzero(xpl, tlen);
1592
1593 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
1594 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1595 xpl->sadb_x_policy_type = sp->policy;
1596 xpl->sadb_x_policy_dir = sp->spidx.dir;
1597 xpl->sadb_x_policy_id = sp->id;
1598 p = (caddr_t)xpl + sizeof(*xpl);
1599
1600 /* if is the policy for ipsec ? */
1601 if (sp->policy == IPSEC_POLICY_IPSEC) {
1602 struct sadb_x_ipsecrequest *xisr;
1603 struct ipsecrequest *isr;
1604
1605 for (isr = sp->req; isr != NULL; isr = isr->next) {
1606
1607 xisr = (struct sadb_x_ipsecrequest *)p;
1608
1609 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1610 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1611 xisr->sadb_x_ipsecrequest_level = isr->level;
1612 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1613
1614 p += sizeof(*xisr);
1615 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1616 p += isr->saidx.src.sa.sa_len;
1617 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1618 p += isr->saidx.src.sa.sa_len;
1619
1620 xisr->sadb_x_ipsecrequest_len =
1621 PFKEY_ALIGN8(sizeof(*xisr)
1622 + isr->saidx.src.sa.sa_len
1623 + isr->saidx.dst.sa.sa_len);
1624 }
1625 }
1626
1627 return m;
1628 }
1629
1630 /* m will not be freed nor modified */
1631 static struct mbuf *
1632 #ifdef __STDC__
1633 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1634 int ndeep, int nitem, ...)
1635 #else
1636 key_gather_mbuf(m, mhp, ndeep, nitem, va_alist)
1637 struct mbuf *m;
1638 const struct sadb_msghdr *mhp;
1639 int ndeep;
1640 int nitem;
1641 va_dcl
1642 #endif
1643 {
1644 va_list ap;
1645 int idx;
1646 int i;
1647 struct mbuf *result = NULL, *n;
1648 int len;
1649
1650 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1651 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1652
1653 va_start(ap, nitem);
1654 for (i = 0; i < nitem; i++) {
1655 idx = va_arg(ap, int);
1656 if (idx < 0 || idx > SADB_EXT_MAX)
1657 goto fail;
1658 /* don't attempt to pull empty extension */
1659 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1660 continue;
1661 if (idx != SADB_EXT_RESERVED &&
1662 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1663 continue;
1664
1665 if (idx == SADB_EXT_RESERVED) {
1666 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1667
1668 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len));
1669
1670 MGETHDR(n, M_DONTWAIT, MT_DATA);
1671 if (!n)
1672 goto fail;
1673 n->m_len = len;
1674 n->m_next = NULL;
1675 m_copydata(m, 0, sizeof(struct sadb_msg),
1676 mtod(n, caddr_t));
1677 } else if (i < ndeep) {
1678 len = mhp->extlen[idx];
1679 n = key_alloc_mbuf(len);
1680 if (!n || n->m_next) { /*XXX*/
1681 if (n)
1682 m_freem(n);
1683 goto fail;
1684 }
1685 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1686 mtod(n, caddr_t));
1687 } else {
1688 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1689 M_DONTWAIT);
1690 }
1691 if (n == NULL)
1692 goto fail;
1693
1694 if (result)
1695 m_cat(result, n);
1696 else
1697 result = n;
1698 }
1699 va_end(ap);
1700
1701 if ((result->m_flags & M_PKTHDR) != 0) {
1702 result->m_pkthdr.len = 0;
1703 for (n = result; n; n = n->m_next)
1704 result->m_pkthdr.len += n->m_len;
1705 }
1706
1707 return result;
1708
1709 fail:
1710 m_freem(result);
1711 return NULL;
1712 }
1713
1714 /*
1715 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1716 * add an entry to SP database, when received
1717 * <base, address(SD), (lifetime(H),) policy>
1718 * from the user(?).
1719 * Adding to SP database,
1720 * and send
1721 * <base, address(SD), (lifetime(H),) policy>
1722 * to the socket which was send.
1723 *
1724 * SPDADD set a unique policy entry.
1725 * SPDSETIDX like SPDADD without a part of policy requests.
1726 * SPDUPDATE replace a unique policy entry.
1727 *
1728 * m will always be freed.
1729 */
1730 static int
1731 key_spdadd(so, m, mhp)
1732 struct socket *so;
1733 struct mbuf *m;
1734 const struct sadb_msghdr *mhp;
1735 {
1736 struct sadb_address *src0, *dst0;
1737 struct sadb_x_policy *xpl0, *xpl;
1738 struct sadb_lifetime *lft = NULL;
1739 struct secpolicyindex spidx;
1740 struct secpolicy *newsp;
1741 int error;
1742
1743 IPSEC_ASSERT(so != NULL, ("null socket"));
1744 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1745 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
1746 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
1747
1748 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
1749 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
1750 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
1751 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1752 return key_senderror(so, m, EINVAL);
1753 }
1754 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
1755 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
1756 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
1757 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
1758 __func__));
1759 return key_senderror(so, m, EINVAL);
1760 }
1761 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
1762 if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
1763 < sizeof(struct sadb_lifetime)) {
1764 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
1765 __func__));
1766 return key_senderror(so, m, EINVAL);
1767 }
1768 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
1769 }
1770
1771 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1772 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1773 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1774
1775 /* make secindex */
1776 /* XXX boundary check against sa_len */
1777 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1778 src0 + 1,
1779 dst0 + 1,
1780 src0->sadb_address_prefixlen,
1781 dst0->sadb_address_prefixlen,
1782 src0->sadb_address_proto,
1783 &spidx);
1784
1785 /* checking the direciton. */
1786 switch (xpl0->sadb_x_policy_dir) {
1787 case IPSEC_DIR_INBOUND:
1788 case IPSEC_DIR_OUTBOUND:
1789 break;
1790 default:
1791 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__));
1792 mhp->msg->sadb_msg_errno = EINVAL;
1793 return 0;
1794 }
1795
1796 /* check policy */
1797 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
1798 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST
1799 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1800 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__));
1801 return key_senderror(so, m, EINVAL);
1802 }
1803
1804 /* policy requests are mandatory when action is ipsec. */
1805 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX
1806 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC
1807 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
1808 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n",
1809 __func__));
1810 return key_senderror(so, m, EINVAL);
1811 }
1812
1813 /*
1814 * checking there is SP already or not.
1815 * SPDUPDATE doesn't depend on whether there is a SP or not.
1816 * If the type is either SPDADD or SPDSETIDX AND a SP is found,
1817 * then error.
1818 */
1819 newsp = key_getsp(&spidx);
1820 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1821 if (newsp) {
1822 newsp->state = IPSEC_SPSTATE_DEAD;
1823 KEY_FREESP(&newsp);
1824 }
1825 } else {
1826 if (newsp != NULL) {
1827 KEY_FREESP(&newsp);
1828 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n",
1829 __func__));
1830 return key_senderror(so, m, EEXIST);
1831 }
1832 }
1833
1834 /* allocation new SP entry */
1835 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
1836 return key_senderror(so, m, error);
1837 }
1838
1839 if ((newsp->id = key_getnewspid()) == 0) {
1840 _key_delsp(newsp);
1841 return key_senderror(so, m, ENOBUFS);
1842 }
1843
1844 /* XXX boundary check against sa_len */
1845 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1846 src0 + 1,
1847 dst0 + 1,
1848 src0->sadb_address_prefixlen,
1849 dst0->sadb_address_prefixlen,
1850 src0->sadb_address_proto,
1851 &newsp->spidx);
1852
1853 /* sanity check on addr pair */
1854 if (((struct sockaddr *)(src0 + 1))->sa_family !=
1855 ((struct sockaddr *)(dst0+ 1))->sa_family) {
1856 _key_delsp(newsp);
1857 return key_senderror(so, m, EINVAL);
1858 }
1859 if (((struct sockaddr *)(src0 + 1))->sa_len !=
1860 ((struct sockaddr *)(dst0+ 1))->sa_len) {
1861 _key_delsp(newsp);
1862 return key_senderror(so, m, EINVAL);
1863 }
1864 #if 1
1865 if (newsp->req && newsp->req->saidx.src.sa.sa_family) {
1866 struct sockaddr *sa;
1867 sa = (struct sockaddr *)(src0 + 1);
1868 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) {
1869 _key_delsp(newsp);
1870 return key_senderror(so, m, EINVAL);
1871 }
1872 }
1873 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) {
1874 struct sockaddr *sa;
1875 sa = (struct sockaddr *)(dst0 + 1);
1876 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) {
1877 _key_delsp(newsp);
1878 return key_senderror(so, m, EINVAL);
1879 }
1880 }
1881 #endif
1882
1883 newsp->created = time_second;
1884 newsp->lastused = newsp->created;
1885 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
1886 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
1887
1888 newsp->refcnt = 1; /* do not reclaim until I say I do */
1889 newsp->state = IPSEC_SPSTATE_ALIVE;
1890 LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain);
1891
1892 /* delete the entry in spacqtree */
1893 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1894 struct secspacq *spacq = key_getspacq(&spidx);
1895 if (spacq != NULL) {
1896 /* reset counter in order to deletion by timehandler. */
1897 spacq->created = time_second;
1898 spacq->count = 0;
1899 SPACQ_UNLOCK();
1900 }
1901 }
1902
1903 {
1904 struct mbuf *n, *mpolicy;
1905 struct sadb_msg *newmsg;
1906 int off;
1907
1908 /* create new sadb_msg to reply. */
1909 if (lft) {
1910 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
1911 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
1912 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1913 } else {
1914 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
1915 SADB_X_EXT_POLICY,
1916 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1917 }
1918 if (!n)
1919 return key_senderror(so, m, ENOBUFS);
1920
1921 if (n->m_len < sizeof(*newmsg)) {
1922 n = m_pullup(n, sizeof(*newmsg));
1923 if (!n)
1924 return key_senderror(so, m, ENOBUFS);
1925 }
1926 newmsg = mtod(n, struct sadb_msg *);
1927 newmsg->sadb_msg_errno = 0;
1928 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
1929
1930 off = 0;
1931 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
1932 sizeof(*xpl), &off);
1933 if (mpolicy == NULL) {
1934 /* n is already freed */
1935 return key_senderror(so, m, ENOBUFS);
1936 }
1937 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
1938 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
1939 m_freem(n);
1940 return key_senderror(so, m, EINVAL);
1941 }
1942 xpl->sadb_x_policy_id = newsp->id;
1943
1944 m_freem(m);
1945 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
1946 }
1947 }
1948
1949 /*
1950 * get new policy id.
1951 * OUT:
1952 * 0: failure.
1953 * others: success.
1954 */
1955 static u_int32_t
1956 key_getnewspid()
1957 {
1958 u_int32_t newid = 0;
1959 int count = key_spi_trycnt; /* XXX */
1960 struct secpolicy *sp;
1961
1962 /* when requesting to allocate spi ranged */
1963 while (count--) {
1964 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1));
1965
1966 if ((sp = key_getspbyid(newid)) == NULL)
1967 break;
1968
1969 KEY_FREESP(&sp);
1970 }
1971
1972 if (count == 0 || newid == 0) {
1973 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n",
1974 __func__));
1975 return 0;
1976 }
1977
1978 return newid;
1979 }
1980
1981 /*
1982 * SADB_SPDDELETE processing
1983 * receive
1984 * <base, address(SD), policy(*)>
1985 * from the user(?), and set SADB_SASTATE_DEAD,
1986 * and send,
1987 * <base, address(SD), policy(*)>
1988 * to the ikmpd.
1989 * policy(*) including direction of policy.
1990 *
1991 * m will always be freed.
1992 */
1993 static int
1994 key_spddelete(so, m, mhp)
1995 struct socket *so;
1996 struct mbuf *m;
1997 const struct sadb_msghdr *mhp;
1998 {
1999 struct sadb_address *src0, *dst0;
2000 struct sadb_x_policy *xpl0;
2001 struct secpolicyindex spidx;
2002 struct secpolicy *sp;
2003
2004 IPSEC_ASSERT(so != NULL, ("null so"));
2005 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2006 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2007 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2008
2009 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
2010 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
2011 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
2012 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2013 __func__));
2014 return key_senderror(so, m, EINVAL);
2015 }
2016 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
2017 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
2018 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2019 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2020 __func__));
2021 return key_senderror(so, m, EINVAL);
2022 }
2023
2024 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
2025 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
2026 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
2027
2028 /* make secindex */
2029 /* XXX boundary check against sa_len */
2030 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
2031 src0 + 1,
2032 dst0 + 1,
2033 src0->sadb_address_prefixlen,
2034 dst0->sadb_address_prefixlen,
2035 src0->sadb_address_proto,
2036 &spidx);
2037
2038 /* checking the direciton. */
2039 switch (xpl0->sadb_x_policy_dir) {
2040 case IPSEC_DIR_INBOUND:
2041 case IPSEC_DIR_OUTBOUND:
2042 break;
2043 default:
2044 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__));
2045 return key_senderror(so, m, EINVAL);
2046 }
2047
2048 /* Is there SP in SPD ? */
2049 if ((sp = key_getsp(&spidx)) == NULL) {
2050 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__));
2051 return key_senderror(so, m, EINVAL);
2052 }
2053
2054 /* save policy id to buffer to be returned. */
2055 xpl0->sadb_x_policy_id = sp->id;
2056
2057 sp->state = IPSEC_SPSTATE_DEAD;
2058 KEY_FREESP(&sp);
2059
2060 {
2061 struct mbuf *n;
2062 struct sadb_msg *newmsg;
2063
2064 /* create new sadb_msg to reply. */
2065 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
2066 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
2067 if (!n)
2068 return key_senderror(so, m, ENOBUFS);
2069
2070 newmsg = mtod(n, struct sadb_msg *);
2071 newmsg->sadb_msg_errno = 0;
2072 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2073
2074 m_freem(m);
2075 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2076 }
2077 }
2078
2079 /*
2080 * SADB_SPDDELETE2 processing
2081 * receive
2082 * <base, policy(*)>
2083 * from the user(?), and set SADB_SASTATE_DEAD,
2084 * and send,
2085 * <base, policy(*)>
2086 * to the ikmpd.
2087 * policy(*) including direction of policy.
2088 *
2089 * m will always be freed.
2090 */
2091 static int
2092 key_spddelete2(so, m, mhp)
2093 struct socket *so;
2094 struct mbuf *m;
2095 const struct sadb_msghdr *mhp;
2096 {
2097 u_int32_t id;
2098 struct secpolicy *sp;
2099
2100 IPSEC_ASSERT(so != NULL, ("null socket"));
2101 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2102 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2103 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2104
2105 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2106 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2107 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__));
2108 return key_senderror(so, m, EINVAL);
2109 }
2110
2111 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2112
2113 /* Is there SP in SPD ? */
2114 if ((sp = key_getspbyid(id)) == NULL) {
2115 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id));
2116 return key_senderror(so, m, EINVAL);
2117 }
2118
2119 sp->state = IPSEC_SPSTATE_DEAD;
2120 KEY_FREESP(&sp);
2121
2122 {
2123 struct mbuf *n, *nn;
2124 struct sadb_msg *newmsg;
2125 int off, len;
2126
2127 /* create new sadb_msg to reply. */
2128 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2129
2130 MGETHDR(n, M_DONTWAIT, MT_DATA);
2131 if (n && len > MHLEN) {
2132 MCLGET(n, M_DONTWAIT);
2133 if ((n->m_flags & M_EXT) == 0) {
2134 m_freem(n);
2135 n = NULL;
2136 }
2137 }
2138 if (!n)
2139 return key_senderror(so, m, ENOBUFS);
2140
2141 n->m_len = len;
2142 n->m_next = NULL;
2143 off = 0;
2144
2145 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
2146 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
2147
2148 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)",
2149 off, len));
2150
2151 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2152 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT);
2153 if (!n->m_next) {
2154 m_freem(n);
2155 return key_senderror(so, m, ENOBUFS);
2156 }
2157
2158 n->m_pkthdr.len = 0;
2159 for (nn = n; nn; nn = nn->m_next)
2160 n->m_pkthdr.len += nn->m_len;
2161
2162 newmsg = mtod(n, struct sadb_msg *);
2163 newmsg->sadb_msg_errno = 0;
2164 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2165
2166 m_freem(m);
2167 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2168 }
2169 }
2170
2171 /*
2172 * SADB_X_GET processing
2173 * receive
2174 * <base, policy(*)>
2175 * from the user(?),
2176 * and send,
2177 * <base, address(SD), policy>
2178 * to the ikmpd.
2179 * policy(*) including direction of policy.
2180 *
2181 * m will always be freed.
2182 */
2183 static int
2184 key_spdget(so, m, mhp)
2185 struct socket *so;
2186 struct mbuf *m;
2187 const struct sadb_msghdr *mhp;
2188 {
2189 u_int32_t id;
2190 struct secpolicy *sp;
2191 struct mbuf *n;
2192
2193 IPSEC_ASSERT(so != NULL, ("null socket"));
2194 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2195 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2196 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2197
2198 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2199 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2200 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2201 __func__));
2202 return key_senderror(so, m, EINVAL);
2203 }
2204
2205 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2206
2207 /* Is there SP in SPD ? */
2208 if ((sp = key_getspbyid(id)) == NULL) {
2209 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id));
2210 return key_senderror(so, m, ENOENT);
2211 }
2212
2213 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
2214 if (n != NULL) {
2215 m_freem(m);
2216 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2217 } else
2218 return key_senderror(so, m, ENOBUFS);
2219 }
2220
2221 /*
2222 * SADB_X_SPDACQUIRE processing.
2223 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2224 * send
2225 * <base, policy(*)>
2226 * to KMD, and expect to receive
2227 * <base> with SADB_X_SPDACQUIRE if error occured,
2228 * or
2229 * <base, policy>
2230 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2231 * policy(*) is without policy requests.
2232 *
2233 * 0 : succeed
2234 * others: error number
2235 */
2236 int
2237 key_spdacquire(sp)
2238 struct secpolicy *sp;
2239 {
2240 struct mbuf *result = NULL, *m;
2241 struct secspacq *newspacq;
2242
2243 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2244 IPSEC_ASSERT(sp->req == NULL, ("policy exists"));
2245 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
2246 ("policy not IPSEC %u", sp->policy));
2247
2248 /* Get an entry to check whether sent message or not. */
2249 newspacq = key_getspacq(&sp->spidx);
2250 if (newspacq != NULL) {
2251 if (key_blockacq_count < newspacq->count) {
2252 /* reset counter and do send message. */
2253 newspacq->count = 0;
2254 } else {
2255 /* increment counter and do nothing. */
2256 newspacq->count++;
2257 return 0;
2258 }
2259 SPACQ_UNLOCK();
2260 } else {
2261 /* make new entry for blocking to send SADB_ACQUIRE. */
2262 newspacq = key_newspacq(&sp->spidx);
2263 if (newspacq == NULL)
2264 return ENOBUFS;
2265 }
2266
2267 /* create new sadb_msg to reply. */
2268 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2269 if (!m)
2270 return ENOBUFS;
2271
2272 result = m;
2273
2274 result->m_pkthdr.len = 0;
2275 for (m = result; m; m = m->m_next)
2276 result->m_pkthdr.len += m->m_len;
2277
2278 mtod(result, struct sadb_msg *)->sadb_msg_len =
2279 PFKEY_UNIT64(result->m_pkthdr.len);
2280
2281 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2282 }
2283
2284 /*
2285 * SADB_SPDFLUSH processing
2286 * receive
2287 * <base>
2288 * from the user, and free all entries in secpctree.
2289 * and send,
2290 * <base>
2291 * to the user.
2292 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2293 *
2294 * m will always be freed.
2295 */
2296 static int
2297 key_spdflush(so, m, mhp)
2298 struct socket *so;
2299 struct mbuf *m;
2300 const struct sadb_msghdr *mhp;
2301 {
2302 struct sadb_msg *newmsg;
2303 struct secpolicy *sp;
2304 u_int dir;
2305
2306 IPSEC_ASSERT(so != NULL, ("null socket"));
2307 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2308 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2309 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2310
2311 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2312 return key_senderror(so, m, EINVAL);
2313
2314 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2315 SPTREE_LOCK();
2316 LIST_FOREACH(sp, &sptree[dir], chain)
2317 sp->state = IPSEC_SPSTATE_DEAD;
2318 SPTREE_UNLOCK();
2319 }
2320
2321 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2322 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
2323 return key_senderror(so, m, ENOBUFS);
2324 }
2325
2326 if (m->m_next)
2327 m_freem(m->m_next);
2328 m->m_next = NULL;
2329 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2330 newmsg = mtod(m, struct sadb_msg *);
2331 newmsg->sadb_msg_errno = 0;
2332 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2333
2334 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2335 }
2336
2337 /*
2338 * SADB_SPDDUMP processing
2339 * receive
2340 * <base>
2341 * from the user, and dump all SP leaves
2342 * and send,
2343 * <base> .....
2344 * to the ikmpd.
2345 *
2346 * m will always be freed.
2347 */
2348 static int
2349 key_spddump(so, m, mhp)
2350 struct socket *so;
2351 struct mbuf *m;
2352 const struct sadb_msghdr *mhp;
2353 {
2354 struct secpolicy *sp;
2355 int cnt;
2356 u_int dir;
2357 struct mbuf *n;
2358
2359 IPSEC_ASSERT(so != NULL, ("null socket"));
2360 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2361 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2362 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2363
2364 /* search SPD entry and get buffer size. */
2365 cnt = 0;
2366 SPTREE_LOCK();
2367 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2368 LIST_FOREACH(sp, &sptree[dir], chain) {
2369 cnt++;
2370 }
2371 }
2372
2373 if (cnt == 0) {
2374 SPTREE_UNLOCK();
2375 return key_senderror(so, m, ENOENT);
2376 }
2377
2378 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2379 LIST_FOREACH(sp, &sptree[dir], chain) {
2380 --cnt;
2381 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2382 mhp->msg->sadb_msg_pid);
2383
2384 if (n)
2385 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2386 }
2387 }
2388
2389 SPTREE_UNLOCK();
2390 m_freem(m);
2391 return 0;
2392 }
2393
2394 static struct mbuf *
2395 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid)
2396 {
2397 struct mbuf *result = NULL, *m;
2398 struct seclifetime lt;
2399
2400 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2401 if (!m)
2402 goto fail;
2403 result = m;
2404
2405 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2406 &sp->spidx.src.sa, sp->spidx.prefs,
2407 sp->spidx.ul_proto);
2408 if (!m)
2409 goto fail;
2410 m_cat(result, m);
2411
2412 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2413 &sp->spidx.dst.sa, sp->spidx.prefd,
2414 sp->spidx.ul_proto);
2415 if (!m)
2416 goto fail;
2417 m_cat(result, m);
2418
2419 m = key_sp2msg(sp);
2420 if (!m)
2421 goto fail;
2422 m_cat(result, m);
2423
2424 if(sp->lifetime){
2425 lt.addtime=sp->created;
2426 lt.usetime= sp->lastused;
2427 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT);
2428 if (!m)
2429 goto fail;
2430 m_cat(result, m);
2431
2432 lt.addtime=sp->lifetime;
2433 lt.usetime= sp->validtime;
2434 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD);
2435 if (!m)
2436 goto fail;
2437 m_cat(result, m);
2438 }
2439
2440 if ((result->m_flags & M_PKTHDR) == 0)
2441 goto fail;
2442
2443 if (result->m_len < sizeof(struct sadb_msg)) {
2444 result = m_pullup(result, sizeof(struct sadb_msg));
2445 if (result == NULL)
2446 goto fail;
2447 }
2448
2449 result->m_pkthdr.len = 0;
2450 for (m = result; m; m = m->m_next)
2451 result->m_pkthdr.len += m->m_len;
2452
2453 mtod(result, struct sadb_msg *)->sadb_msg_len =
2454 PFKEY_UNIT64(result->m_pkthdr.len);
2455
2456 return result;
2457
2458 fail:
2459 m_freem(result);
2460 return NULL;
2461 }
2462
2463 /*
2464 * get PFKEY message length for security policy and request.
2465 */
2466 static u_int
2467 key_getspreqmsglen(sp)
2468 struct secpolicy *sp;
2469 {
2470 u_int tlen;
2471
2472 tlen = sizeof(struct sadb_x_policy);
2473
2474 /* if is the policy for ipsec ? */
2475 if (sp->policy != IPSEC_POLICY_IPSEC)
2476 return tlen;
2477
2478 /* get length of ipsec requests */
2479 {
2480 struct ipsecrequest *isr;
2481 int len;
2482
2483 for (isr = sp->req; isr != NULL; isr = isr->next) {
2484 len = sizeof(struct sadb_x_ipsecrequest)
2485 + isr->saidx.src.sa.sa_len
2486 + isr->saidx.dst.sa.sa_len;
2487
2488 tlen += PFKEY_ALIGN8(len);
2489 }
2490 }
2491
2492 return tlen;
2493 }
2494
2495 /*
2496 * SADB_SPDEXPIRE processing
2497 * send
2498 * <base, address(SD), lifetime(CH), policy>
2499 * to KMD by PF_KEY.
2500 *
2501 * OUT: 0 : succeed
2502 * others : error number
2503 */
2504 static int
2505 key_spdexpire(sp)
2506 struct secpolicy *sp;
2507 {
2508 struct mbuf *result = NULL, *m;
2509 int len;
2510 int error = -1;
2511 struct sadb_lifetime *lt;
2512
2513 /* XXX: Why do we lock ? */
2514
2515 IPSEC_ASSERT(sp != NULL, ("null secpolicy"));
2516
2517 /* set msg header */
2518 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2519 if (!m) {
2520 error = ENOBUFS;
2521 goto fail;
2522 }
2523 result = m;
2524
2525 /* create lifetime extension (current and hard) */
2526 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2527 m = key_alloc_mbuf(len);
2528 if (!m || m->m_next) { /*XXX*/
2529 if (m)
2530 m_freem(m);
2531 error = ENOBUFS;
2532 goto fail;
2533 }
2534 bzero(mtod(m, caddr_t), len);
2535 lt = mtod(m, struct sadb_lifetime *);
2536 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2537 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2538 lt->sadb_lifetime_allocations = 0;
2539 lt->sadb_lifetime_bytes = 0;
2540 lt->sadb_lifetime_addtime = sp->created;
2541 lt->sadb_lifetime_usetime = sp->lastused;
2542 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2543 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2544 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2545 lt->sadb_lifetime_allocations = 0;
2546 lt->sadb_lifetime_bytes = 0;
2547 lt->sadb_lifetime_addtime = sp->lifetime;
2548 lt->sadb_lifetime_usetime = sp->validtime;
2549 m_cat(result, m);
2550
2551 /* set sadb_address for source */
2552 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2553 &sp->spidx.src.sa,
2554 sp->spidx.prefs, sp->spidx.ul_proto);
2555 if (!m) {
2556 error = ENOBUFS;
2557 goto fail;
2558 }
2559 m_cat(result, m);
2560
2561 /* set sadb_address for destination */
2562 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2563 &sp->spidx.dst.sa,
2564 sp->spidx.prefd, sp->spidx.ul_proto);
2565 if (!m) {
2566 error = ENOBUFS;
2567 goto fail;
2568 }
2569 m_cat(result, m);
2570
2571 /* set secpolicy */
2572 m = key_sp2msg(sp);
2573 if (!m) {
2574 error = ENOBUFS;
2575 goto fail;
2576 }
2577 m_cat(result, m);
2578
2579 if ((result->m_flags & M_PKTHDR) == 0) {
2580 error = EINVAL;
2581 goto fail;
2582 }
2583
2584 if (result->m_len < sizeof(struct sadb_msg)) {
2585 result = m_pullup(result, sizeof(struct sadb_msg));
2586 if (result == NULL) {
2587 error = ENOBUFS;
2588 goto fail;
2589 }
2590 }
2591
2592 result->m_pkthdr.len = 0;
2593 for (m = result; m; m = m->m_next)
2594 result->m_pkthdr.len += m->m_len;
2595
2596 mtod(result, struct sadb_msg *)->sadb_msg_len =
2597 PFKEY_UNIT64(result->m_pkthdr.len);
2598
2599 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2600
2601 fail:
2602 if (result)
2603 m_freem(result);
2604 return error;
2605 }
2606
2607 /* %%% SAD management */
2608 /*
2609 * allocating a memory for new SA head, and copy from the values of mhp.
2610 * OUT: NULL : failure due to the lack of memory.
2611 * others : pointer to new SA head.
2612 */
2613 static struct secashead *
2614 key_newsah(saidx)
2615 struct secasindex *saidx;
2616 {
2617 struct secashead *newsah;
2618
2619 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
2620
2621 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO);
2622 if (newsah != NULL) {
2623 int i;
2624 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++)
2625 LIST_INIT(&newsah->savtree[i]);
2626 newsah->saidx = *saidx;
2627
2628 /* add to saidxtree */
2629 newsah->state = SADB_SASTATE_MATURE;
2630
2631 SAHTREE_LOCK();
2632 LIST_INSERT_HEAD(&sahtree, newsah, chain);
2633 SAHTREE_UNLOCK();
2634 }
2635 return(newsah);
2636 }
2637
2638 /*
2639 * delete SA index and all SA registerd.
2640 */
2641 static void
2642 key_delsah(sah)
2643 struct secashead *sah;
2644 {
2645 struct secasvar *sav, *nextsav;
2646 u_int stateidx;
2647 int zombie = 0;
2648
2649 IPSEC_ASSERT(sah != NULL, ("NULL sah"));
2650 SAHTREE_LOCK_ASSERT();
2651
2652 /* searching all SA registerd in the secindex. */
2653 for (stateidx = 0;
2654 stateidx < _ARRAYLEN(saorder_state_any);
2655 stateidx++) {
2656 u_int state = saorder_state_any[stateidx];
2657 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) {
2658 if (sav->refcnt == 0) {
2659 /* sanity check */
2660 KEY_CHKSASTATE(state, sav->state, __func__);
2661 /*
2662 * do NOT call KEY_FREESAV here:
2663 * it will only delete the sav if refcnt == 1,
2664 * where we already know that refcnt == 0
2665 */
2666 key_delsav(sav);
2667 } else {
2668 /* give up to delete this sa */
2669 zombie++;
2670 }
2671 }
2672 }
2673 if (!zombie) { /* delete only if there are savs */
2674 /* remove from tree of SA index */
2675 if (__LIST_CHAINED(sah))
2676 LIST_REMOVE(sah, chain);
2677 if (sah->route_cache.sa_route.ro_rt) {
2678 RTFREE(sah->route_cache.sa_route.ro_rt);
2679 sah->route_cache.sa_route.ro_rt = (struct rtentry *)NULL;
2680 }
2681 free(sah, M_IPSEC_SAH);
2682 }
2683 }
2684
2685 /*
2686 * allocating a new SA with LARVAL state. key_add() and key_getspi() call,
2687 * and copy the values of mhp into new buffer.
2688 * When SAD message type is GETSPI:
2689 * to set sequence number from acq_seq++,
2690 * to set zero to SPI.
2691 * not to call key_setsava().
2692 * OUT: NULL : fail
2693 * others : pointer to new secasvar.
2694 *
2695 * does not modify mbuf. does not free mbuf on error.
2696 */
2697 static struct secasvar *
2698 key_newsav(m, mhp, sah, errp, where, tag)
2699 struct mbuf *m;
2700 const struct sadb_msghdr *mhp;
2701 struct secashead *sah;
2702 int *errp;
2703 const char* where;
2704 int tag;
2705 {
2706 struct secasvar *newsav;
2707 const struct sadb_sa *xsa;
2708
2709 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2710 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2711 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2712 IPSEC_ASSERT(sah != NULL, ("null secashead"));
2713
2714 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO);
2715 if (newsav == NULL) {
2716 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
2717 *errp = ENOBUFS;
2718 goto done;
2719 }
2720
2721 switch (mhp->msg->sadb_msg_type) {
2722 case SADB_GETSPI:
2723 newsav->spi = 0;
2724
2725 #ifdef IPSEC_DOSEQCHECK
2726 /* sync sequence number */
2727 if (mhp->msg->sadb_msg_seq == 0)
2728 newsav->seq =
2729 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
2730 else
2731 #endif
2732 newsav->seq = mhp->msg->sadb_msg_seq;
2733 break;
2734
2735 case SADB_ADD:
2736 /* sanity check */
2737 if (mhp->ext[SADB_EXT_SA] == NULL) {
2738 free(newsav, M_IPSEC_SA);
2739 newsav = NULL;
2740 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
2741 __func__));
2742 *errp = EINVAL;
2743 goto done;
2744 }
2745 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
2746 newsav->spi = xsa->sadb_sa_spi;
2747 newsav->seq = mhp->msg->sadb_msg_seq;
2748 break;
2749 default:
2750 free(newsav, M_IPSEC_SA);
2751 newsav = NULL;
2752 *errp = EINVAL;
2753 goto done;
2754 }
2755
2756
2757 /* copy sav values */
2758 if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
2759 *errp = key_setsaval(newsav, m, mhp);
2760 if (*errp) {
2761 free(newsav, M_IPSEC_SA);
2762 newsav = NULL;
2763 goto done;
2764 }
2765 }
2766
2767 SECASVAR_LOCK_INIT(newsav);
2768
2769 /* reset created */
2770 newsav->created = time_second;
2771 newsav->pid = mhp->msg->sadb_msg_pid;
2772
2773 /* add to satree */
2774 newsav->sah = sah;
2775 sa_initref(newsav);
2776 newsav->state = SADB_SASTATE_LARVAL;
2777
2778 /* XXX locking??? */
2779 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
2780 secasvar, chain);
2781 done:
2782 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
2783 printf("DP %s from %s:%u return SP:%p\n", __func__,
2784 where, tag, newsav));
2785
2786 return newsav;
2787 }
2788
2789 /*
2790 * free() SA variable entry.
2791 */
2792 static void
2793 key_cleansav(struct secasvar *sav)
2794 {
2795 /*
2796 * Cleanup xform state. Note that zeroize'ing causes the
2797 * keys to be cleared; otherwise we must do it ourself.
2798 */
2799 if (sav->tdb_xform != NULL) {
2800 sav->tdb_xform->xf_zeroize(sav);
2801 sav->tdb_xform = NULL;
2802 } else {
2803 KASSERT(sav->iv == NULL, ("iv but no xform"));
2804 if (sav->key_auth != NULL)
2805 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth));
2806 if (sav->key_enc != NULL)
2807 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc));
2808 }
2809 if (sav->key_auth != NULL) {
2810 if (sav->key_auth->key_data != NULL)
2811 free(sav->key_auth->key_data, M_IPSEC_MISC);
2812 free(sav->key_auth, M_IPSEC_MISC);
2813 sav->key_auth = NULL;
2814 }
2815 if (sav->key_enc != NULL) {
2816 if (sav->key_enc->key_data != NULL)
2817 free(sav->key_enc->key_data, M_IPSEC_MISC);
2818 free(sav->key_enc, M_IPSEC_MISC);
2819 sav->key_enc = NULL;
2820 }
2821 if (sav->sched) {
2822 bzero(sav->sched, sav->schedlen);
2823 free(sav->sched, M_IPSEC_MISC);
2824 sav->sched = NULL;
2825 }
2826 if (sav->replay != NULL) {
2827 free(sav->replay, M_IPSEC_MISC);
2828 sav->replay = NULL;
2829 }
2830 if (sav->lft_c != NULL) {
2831 free(sav->lft_c, M_IPSEC_MISC);
2832 sav->lft_c = NULL;
2833 }
2834 if (sav->lft_h != NULL) {
2835 free(sav->lft_h, M_IPSEC_MISC);
2836 sav->lft_h = NULL;
2837 }
2838 if (sav->lft_s != NULL) {
2839 free(sav->lft_s, M_IPSEC_MISC);
2840 sav->lft_s = NULL;
2841 }
2842 }
2843
2844 /*
2845 * free() SA variable entry.
2846 */
2847 static void
2848 key_delsav(sav)
2849 struct secasvar *sav;
2850 {
2851 IPSEC_ASSERT(sav != NULL, ("null sav"));
2852 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt));
2853
2854 /* remove from SA header */
2855 if (__LIST_CHAINED(sav))
2856 LIST_REMOVE(sav, chain);
2857 key_cleansav(sav);
2858 SECASVAR_LOCK_DESTROY(sav);
2859 free(sav, M_IPSEC_SA);
2860 }
2861
2862 /*
2863 * search SAD.
2864 * OUT:
2865 * NULL : not found
2866 * others : found, pointer to a SA.
2867 */
2868 static struct secashead *
2869 key_getsah(saidx)
2870 struct secasindex *saidx;
2871 {
2872 struct secashead *sah;
2873
2874 SAHTREE_LOCK();
2875 LIST_FOREACH(sah, &sahtree, chain) {
2876 if (sah->state == SADB_SASTATE_DEAD)
2877 continue;
2878 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID))
2879 break;
2880 }
2881 SAHTREE_UNLOCK();
2882
2883 return sah;
2884 }
2885
2886 /*
2887 * check not to be duplicated SPI.
2888 * NOTE: this function is too slow due to searching all SAD.
2889 * OUT:
2890 * NULL : not found
2891 * others : found, pointer to a SA.
2892 */
2893 static struct secasvar *
2894 key_checkspidup(saidx, spi)
2895 struct secasindex *saidx;
2896 u_int32_t spi;
2897 {
2898 struct secashead *sah;
2899 struct secasvar *sav;
2900
2901 /* check address family */
2902 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) {
2903 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
2904 __func__));
2905 return NULL;
2906 }
2907
2908 sav = NULL;
2909 /* check all SAD */
2910 SAHTREE_LOCK();
2911 LIST_FOREACH(sah, &sahtree, chain) {
2912 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst))
2913 continue;
2914 sav = key_getsavbyspi(sah, spi);
2915 if (sav != NULL)
2916 break;
2917 }
2918 SAHTREE_UNLOCK();
2919
2920 return sav;
2921 }
2922
2923 /*
2924 * search SAD litmited alive SA, protocol, SPI.
2925 * OUT:
2926 * NULL : not found
2927 * others : found, pointer to a SA.
2928 */
2929 static struct secasvar *
2930 key_getsavbyspi(sah, spi)
2931 struct secashead *sah;
2932 u_int32_t spi;
2933 {
2934 struct secasvar *sav;
2935 u_int stateidx, state;
2936
2937 sav = NULL;
2938 SAHTREE_LOCK_ASSERT();
2939 /* search all status */
2940 for (stateidx = 0;
2941 stateidx < _ARRAYLEN(saorder_state_alive);
2942 stateidx++) {
2943
2944 state = saorder_state_alive[stateidx];
2945 LIST_FOREACH(sav, &sah->savtree[state], chain) {
2946
2947 /* sanity check */
2948 if (sav->state != state) {
2949 ipseclog((LOG_DEBUG, "%s: "
2950 "invalid sav->state (queue: %d SA: %d)\n",
2951 __func__, state, sav->state));
2952 continue;
2953 }
2954
2955 if (sav->spi == spi)
2956 return sav;
2957 }
2958 }
2959
2960 return NULL;
2961 }
2962
2963 /*
2964 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*.
2965 * You must update these if need.
2966 * OUT: 0: success.
2967 * !0: failure.
2968 *
2969 * does not modify mbuf. does not free mbuf on error.
2970 */
2971 static int
2972 key_setsaval(sav, m, mhp)
2973 struct secasvar *sav;
2974 struct mbuf *m;
2975 const struct sadb_msghdr *mhp;
2976 {
2977 int error = 0;
2978
2979 IPSEC_ASSERT(m != NULL, ("null mbuf"));
2980 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
2981 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
2982
2983 /* initialization */
2984 sav->replay = NULL;
2985 sav->key_auth = NULL;
2986 sav->key_enc = NULL;
2987 sav->sched = NULL;
2988 sav->schedlen = 0;
2989 sav->iv = NULL;
2990 sav->lft_c = NULL;
2991 sav->lft_h = NULL;
2992 sav->lft_s = NULL;
2993 sav->tdb_xform = NULL; /* transform */
2994 sav->tdb_encalgxform = NULL; /* encoding algorithm */
2995 sav->tdb_authalgxform = NULL; /* authentication algorithm */
2996 sav->tdb_compalgxform = NULL; /* compression algorithm */
2997
2998 /* SA */
2999 if (mhp->ext[SADB_EXT_SA] != NULL) {
3000 const struct sadb_sa *sa0;
3001
3002 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
3003 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
3004 error = EINVAL;
3005 goto fail;
3006 }
3007
3008 sav->alg_auth = sa0->sadb_sa_auth;
3009 sav->alg_enc = sa0->sadb_sa_encrypt;
3010 sav->flags = sa0->sadb_sa_flags;
3011
3012 /* replay window */
3013 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
3014 sav->replay = (struct secreplay *)
3015 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO);
3016 if (sav->replay == NULL) {
3017 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3018 __func__));
3019 error = ENOBUFS;
3020 goto fail;
3021 }
3022 if (sa0->sadb_sa_replay != 0)
3023 sav->replay->bitmap = (caddr_t)(sav->replay+1);
3024 sav->replay->wsize = sa0->sadb_sa_replay;
3025 }
3026 }
3027
3028 /* Authentication keys */
3029 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
3030 const struct sadb_key *key0;
3031 int len;
3032
3033 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
3034 len = mhp->extlen[SADB_EXT_KEY_AUTH];
3035
3036 error = 0;
3037 if (len < sizeof(*key0)) {
3038 error = EINVAL;
3039 goto fail;
3040 }
3041 switch (mhp->msg->sadb_msg_satype) {
3042 case SADB_SATYPE_AH:
3043 case SADB_SATYPE_ESP:
3044 case SADB_X_SATYPE_TCPSIGNATURE:
3045 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3046 sav->alg_auth != SADB_X_AALG_NULL)
3047 error = EINVAL;
3048 break;
3049 case SADB_X_SATYPE_IPCOMP:
3050 default:
3051 error = EINVAL;
3052 break;
3053 }
3054 if (error) {
3055 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n",
3056 __func__));
3057 goto fail;
3058 }
3059
3060 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len,
3061 M_IPSEC_MISC);
3062 if (sav->key_auth == NULL ) {
3063 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3064 __func__));
3065 error = ENOBUFS;
3066 goto fail;
3067 }
3068 }
3069
3070 /* Encryption key */
3071 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
3072 const struct sadb_key *key0;
3073 int len;
3074
3075 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
3076 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
3077
3078 error = 0;
3079 if (len < sizeof(*key0)) {
3080 error = EINVAL;
3081 goto fail;
3082 }
3083 switch (mhp->msg->sadb_msg_satype) {
3084 case SADB_SATYPE_ESP:
3085 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
3086 sav->alg_enc != SADB_EALG_NULL) {
3087 error = EINVAL;
3088 break;
3089 }
3090 sav->key_enc = (struct seckey *)key_dup_keymsg(key0,
3091 len,
3092 M_IPSEC_MISC);
3093 if (sav->key_enc == NULL) {
3094 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3095 __func__));
3096 error = ENOBUFS;
3097 goto fail;
3098 }
3099 break;
3100 case SADB_X_SATYPE_IPCOMP:
3101 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
3102 error = EINVAL;
3103 sav->key_enc = NULL; /*just in case*/
3104 break;
3105 case SADB_SATYPE_AH:
3106 case SADB_X_SATYPE_TCPSIGNATURE:
3107 default:
3108 error = EINVAL;
3109 break;
3110 }
3111 if (error) {
3112 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n",
3113 __func__));
3114 goto fail;
3115 }
3116 }
3117
3118 /* set iv */
3119 sav->ivlen = 0;
3120
3121 switch (mhp->msg->sadb_msg_satype) {
3122 case SADB_SATYPE_AH:
3123 error = xform_init(sav, XF_AH);
3124 break;
3125 case SADB_SATYPE_ESP:
3126 error = xform_init(sav, XF_ESP);
3127 break;
3128 case SADB_X_SATYPE_IPCOMP:
3129 error = xform_init(sav, XF_IPCOMP);
3130 break;
3131 case SADB_X_SATYPE_TCPSIGNATURE:
3132 error = xform_init(sav, XF_TCPSIGNATURE);
3133 break;
3134 }
3135 if (error) {
3136 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n",
3137 __func__, mhp->msg->sadb_msg_satype));
3138 goto fail;
3139 }
3140
3141 /* reset created */
3142 sav->created = time_second;
3143
3144 /* make lifetime for CURRENT */
3145 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT);
3146 if (sav->lft_c == NULL) {
3147 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3148 error = ENOBUFS;
3149 goto fail;
3150 }
3151
3152 sav->lft_c->allocations = 0;
3153 sav->lft_c->bytes = 0;
3154 sav->lft_c->addtime = time_second;
3155 sav->lft_c->usetime = 0;
3156
3157 /* lifetimes for HARD and SOFT */
3158 {
3159 const struct sadb_lifetime *lft0;
3160
3161 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
3162 if (lft0 != NULL) {
3163 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
3164 error = EINVAL;
3165 goto fail;
3166 }
3167 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC);
3168 if (sav->lft_h == NULL) {
3169 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
3170 error = ENOBUFS;
3171 goto fail;
3172 }
3173 /* to be initialize ? */
3174 }
3175
3176 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
3177 if (lft0 != NULL) {
3178 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
3179 error = EINVAL;
3180 goto fail;
3181 }
3182 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC);
3183 if (sav->lft_s == NULL) {
3184 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
3185 error = ENOBUFS;
3186 goto fail;
3187 }
3188 /* to be initialize ? */
3189 }
3190 }
3191
3192 return 0;
3193
3194 fail:
3195 /* initialization */
3196 key_cleansav(sav);
3197
3198 return error;
3199 }
3200
3201 /*
3202 * validation with a secasvar entry, and set SADB_SATYPE_MATURE.
3203 * OUT: 0: valid
3204 * other: errno
3205 */
3206 static int
3207 key_mature(struct secasvar *sav)
3208 {
3209 int error;
3210
3211 /* check SPI value */
3212 switch (sav->sah->saidx.proto) {
3213 case IPPROTO_ESP:
3214 case IPPROTO_AH:
3215 /*
3216 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values
3217 * 1-255 reserved by IANA for future use,
3218 * 0 for implementation specific, local use.
3219 */
3220 if (ntohl(sav->spi) <= 255) {
3221 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n",
3222 __func__, (u_int32_t)ntohl(sav->spi)));
3223 return EINVAL;
3224 }
3225 break;
3226 }
3227
3228 /* check satype */
3229 switch (sav->sah->saidx.proto) {
3230 case IPPROTO_ESP:
3231 /* check flags */
3232 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) ==
3233 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) {
3234 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3235 "given to old-esp.\n", __func__));
3236 return EINVAL;
3237 }
3238 error = xform_init(sav, XF_ESP);
3239 break;
3240 case IPPROTO_AH:
3241 /* check flags */
3242 if (sav->flags & SADB_X_EXT_DERIV) {
3243 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) "
3244 "given to AH SA.\n", __func__));
3245 return EINVAL;
3246 }
3247 if (sav->alg_enc != SADB_EALG_NONE) {
3248 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3249 "mismated.\n", __func__));
3250 return(EINVAL);
3251 }
3252 error = xform_init(sav, XF_AH);
3253 break;
3254 case IPPROTO_IPCOMP:
3255 if (sav->alg_auth != SADB_AALG_NONE) {
3256 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3257 "mismated.\n", __func__));
3258 return(EINVAL);
3259 }
3260 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0
3261 && ntohl(sav->spi) >= 0x10000) {
3262 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n",
3263 __func__));
3264 return(EINVAL);
3265 }
3266 error = xform_init(sav, XF_IPCOMP);
3267 break;
3268 case IPPROTO_TCP:
3269 if (sav->alg_enc != SADB_EALG_NONE) {
3270 ipseclog((LOG_DEBUG, "%s: protocol and algorithm "
3271 "mismated.\n", __func__));
3272 return(EINVAL);
3273 }
3274 error = xform_init(sav, XF_TCPSIGNATURE);
3275 break;
3276 default:
3277 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__));
3278 error = EPROTONOSUPPORT;
3279 break;
3280 }
3281 if (error == 0) {
3282 SAHTREE_LOCK();
3283 key_sa_chgstate(sav, SADB_SASTATE_MATURE);
3284 SAHTREE_UNLOCK();
3285 }
3286 return (error);
3287 }
3288
3289 /*
3290 * subroutine for SADB_GET and SADB_DUMP.
3291 */
3292 static struct mbuf *
3293 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype,
3294 u_int32_t seq, u_int32_t pid)
3295 {
3296 struct mbuf *result = NULL, *tres = NULL, *m;
3297 int i;
3298 int dumporder[] = {
3299 SADB_EXT_SA, SADB_X_EXT_SA2,
3300 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3301 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3302 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
3303 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
3304 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
3305 };
3306
3307 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3308 if (m == NULL)
3309 goto fail;
3310 result = m;
3311
3312 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) {
3313 m = NULL;
3314 switch (dumporder[i]) {
3315 case SADB_EXT_SA:
3316 m = key_setsadbsa(sav);
3317 if (!m)
3318 goto fail;
3319 break;
3320
3321 case SADB_X_EXT_SA2:
3322 m = key_setsadbxsa2(sav->sah->saidx.mode,
3323 sav->replay ? sav->replay->count : 0,
3324 sav->sah->saidx.reqid);
3325 if (!m)
3326 goto fail;
3327 break;
3328
3329 case SADB_EXT_ADDRESS_SRC:
3330 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3331 &sav->sah->saidx.src.sa,
3332 FULLMASK, IPSEC_ULPROTO_ANY);
3333 if (!m)
3334 goto fail;
3335 break;
3336
3337 case SADB_EXT_ADDRESS_DST:
3338 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3339 &sav->sah->saidx.dst.sa,
3340 FULLMASK, IPSEC_ULPROTO_ANY);
3341 if (!m)
3342 goto fail;
3343 break;
3344
3345 case SADB_EXT_KEY_AUTH:
3346 if (!sav->key_auth)
3347 continue;
3348 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH);
3349 if (!m)
3350 goto fail;
3351 break;
3352
3353 case SADB_EXT_KEY_ENCRYPT:
3354 if (!sav->key_enc)
3355 continue;
3356 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT);
3357 if (!m)
3358 goto fail;
3359 break;
3360
3361 case SADB_EXT_LIFETIME_CURRENT:
3362 if (!sav->lft_c)
3363 continue;
3364 m = key_setlifetime(sav->lft_c,
3365 SADB_EXT_LIFETIME_CURRENT);
3366 if (!m)
3367 goto fail;
3368 break;
3369
3370 case SADB_EXT_LIFETIME_HARD:
3371 if (!sav->lft_h)
3372 continue;
3373 m = key_setlifetime(sav->lft_h,
3374 SADB_EXT_LIFETIME_HARD);
3375 if (!m)
3376 goto fail;
3377 break;
3378
3379 case SADB_EXT_LIFETIME_SOFT:
3380 if (!sav->lft_s)
3381 continue;
3382 m = key_setlifetime(sav->lft_s,
3383 SADB_EXT_LIFETIME_SOFT);
3384
3385 if (!m)
3386 goto fail;
3387 break;
3388
3389 case SADB_EXT_ADDRESS_PROXY:
3390 case SADB_EXT_IDENTITY_SRC:
3391 case SADB_EXT_IDENTITY_DST:
3392 /* XXX: should we brought from SPD ? */
3393 case SADB_EXT_SENSITIVITY:
3394 default:
3395 continue;
3396 }
3397
3398 if (!m)
3399 goto fail;
3400 if (tres)
3401 m_cat(m, tres);
3402 tres = m;
3403
3404 }
3405
3406 m_cat(result, tres);
3407 if (result->m_len < sizeof(struct sadb_msg)) {
3408 result = m_pullup(result, sizeof(struct sadb_msg));
3409 if (result == NULL)
3410 goto fail;
3411 }
3412
3413 result->m_pkthdr.len = 0;
3414 for (m = result; m; m = m->m_next)
3415 result->m_pkthdr.len += m->m_len;
3416
3417 mtod(result, struct sadb_msg *)->sadb_msg_len =
3418 PFKEY_UNIT64(result->m_pkthdr.len);
3419
3420 return result;
3421
3422 fail:
3423 m_freem(result);
3424 m_freem(tres);
3425 return NULL;
3426 }
3427
3428 /*
3429 * set data into sadb_msg.
3430 */
3431 static struct mbuf *
3432 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3433 pid_t pid, u_int16_t reserved)
3434 {
3435 struct mbuf *m;
3436 struct sadb_msg *p;
3437 int len;
3438
3439 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3440 if (len > MCLBYTES)
3441 return NULL;
3442 MGETHDR(m, M_DONTWAIT, MT_DATA);
3443 if (m && len > MHLEN) {
3444 MCLGET(m, M_DONTWAIT);
3445 if ((m->m_flags & M_EXT) == 0) {
3446 m_freem(m);
3447 m = NULL;
3448 }
3449 }
3450 if (!m)
3451 return NULL;
3452 m->m_pkthdr.len = m->m_len = len;
3453 m->m_next = NULL;
3454
3455 p = mtod(m, struct sadb_msg *);
3456
3457 bzero(p, len);
3458 p->sadb_msg_version = PF_KEY_V2;
3459 p->sadb_msg_type = type;
3460 p->sadb_msg_errno = 0;
3461 p->sadb_msg_satype = satype;
3462 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3463 p->sadb_msg_reserved = reserved;
3464 p->sadb_msg_seq = seq;
3465 p->sadb_msg_pid = (u_int32_t)pid;
3466
3467 return m;
3468 }
3469
3470 /*
3471 * copy secasvar data into sadb_address.
3472 */
3473 static struct mbuf *
3474 key_setsadbsa(sav)
3475 struct secasvar *sav;
3476 {
3477 struct mbuf *m;
3478 struct sadb_sa *p;
3479 int len;
3480
3481 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3482 m = key_alloc_mbuf(len);
3483 if (!m || m->m_next) { /*XXX*/
3484 if (m)
3485 m_freem(m);
3486 return NULL;
3487 }
3488
3489 p = mtod(m, struct sadb_sa *);
3490
3491 bzero(p, len);
3492 p->sadb_sa_len = PFKEY_UNIT64(len);
3493 p->sadb_sa_exttype = SADB_EXT_SA;
3494 p->sadb_sa_spi = sav->spi;
3495 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
3496 p->sadb_sa_state = sav->state;
3497 p->sadb_sa_auth = sav->alg_auth;
3498 p->sadb_sa_encrypt = sav->alg_enc;
3499 p->sadb_sa_flags = sav->flags;
3500
3501 return m;
3502 }
3503
3504 /*
3505 * set data into sadb_address.
3506 */
3507 static struct mbuf *
3508 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto)
3509 {
3510 struct mbuf *m;
3511 struct sadb_address *p;
3512 size_t len;
3513
3514 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3515 PFKEY_ALIGN8(saddr->sa_len);
3516 m = key_alloc_mbuf(len);
3517 if (!m || m->m_next) { /*XXX*/
3518 if (m)
3519 m_freem(m);
3520 return NULL;
3521 }
3522
3523 p = mtod(m, struct sadb_address *);
3524
3525 bzero(p, len);
3526 p->sadb_address_len = PFKEY_UNIT64(len);
3527 p->sadb_address_exttype = exttype;
3528 p->sadb_address_proto = ul_proto;
3529 if (prefixlen == FULLMASK) {
3530 switch (saddr->sa_family) {
3531 case AF_INET:
3532 prefixlen = sizeof(struct in_addr) << 3;
3533 break;
3534 case AF_INET6:
3535 prefixlen = sizeof(struct in6_addr) << 3;
3536 break;
3537 default:
3538 ; /*XXX*/
3539 }
3540 }
3541 p->sadb_address_prefixlen = prefixlen;
3542 p->sadb_address_reserved = 0;
3543
3544 bcopy(saddr,
3545 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3546 saddr->sa_len);
3547
3548 return m;
3549 }
3550
3551 /*
3552 * set data into sadb_x_sa2.
3553 */
3554 static struct mbuf *
3555 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3556 {
3557 struct mbuf *m;
3558 struct sadb_x_sa2 *p;
3559 size_t len;
3560
3561 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3562 m = key_alloc_mbuf(len);
3563 if (!m || m->m_next) { /*XXX*/
3564 if (m)
3565 m_freem(m);
3566 return NULL;
3567 }
3568
3569 p = mtod(m, struct sadb_x_sa2 *);
3570
3571 bzero(p, len);
3572 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3573 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3574 p->sadb_x_sa2_mode = mode;
3575 p->sadb_x_sa2_reserved1 = 0;
3576 p->sadb_x_sa2_reserved2 = 0;
3577 p->sadb_x_sa2_sequence = seq;
3578 p->sadb_x_sa2_reqid = reqid;
3579
3580 return m;
3581 }
3582
3583 /*
3584 * set data into sadb_x_policy
3585 */
3586 static struct mbuf *
3587 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id)
3588 {
3589 struct mbuf *m;
3590 struct sadb_x_policy *p;
3591 size_t len;
3592
3593 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
3594 m = key_alloc_mbuf(len);
3595 if (!m || m->m_next) { /*XXX*/
3596 if (m)
3597 m_freem(m);
3598 return NULL;
3599 }
3600
3601 p = mtod(m, struct sadb_x_policy *);
3602
3603 bzero(p, len);
3604 p->sadb_x_policy_len = PFKEY_UNIT64(len);
3605 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3606 p->sadb_x_policy_type = type;
3607 p->sadb_x_policy_dir = dir;
3608 p->sadb_x_policy_id = id;
3609
3610 return m;
3611 }
3612
3613 /* %%% utilities */
3614 /* Take a key message (sadb_key) from the socket and turn it into one
3615 * of the kernel's key structures (seckey).
3616 *
3617 * IN: pointer to the src
3618 * OUT: NULL no more memory
3619 */
3620 struct seckey *
3621 key_dup_keymsg(const struct sadb_key *src, u_int len,
3622 struct malloc_type *type)
3623 {
3624 struct seckey *dst;
3625 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT);
3626 if (dst != NULL) {
3627 dst->bits = src->sadb_key_bits;
3628 dst->key_data = (char *)malloc(len, type, M_NOWAIT);
3629 if (dst->key_data != NULL) {
3630 bcopy((const char *)src + sizeof(struct sadb_key),
3631 dst->key_data, len);
3632 } else {
3633 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3634 __func__));
3635 free(dst, type);
3636 dst = NULL;
3637 }
3638 } else {
3639 ipseclog((LOG_DEBUG, "%s: No more memory.\n",
3640 __func__));
3641
3642 }
3643 return dst;
3644 }
3645
3646 /* Take a lifetime message (sadb_lifetime) passed in on a socket and
3647 * turn it into one of the kernel's lifetime structures (seclifetime).
3648 *
3649 * IN: pointer to the destination, source and malloc type
3650 * OUT: NULL, no more memory
3651 */
3652
3653 static struct seclifetime *
3654 key_dup_lifemsg(const struct sadb_lifetime *src,
3655 struct malloc_type *type)
3656 {
3657 struct seclifetime *dst = NULL;
3658
3659 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime),
3660 type, M_NOWAIT);
3661 if (dst == NULL) {
3662 /* XXX counter */
3663 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
3664 } else {
3665 dst->allocations = src->sadb_lifetime_allocations;
3666 dst->bytes = src->sadb_lifetime_bytes;
3667 dst->addtime = src->sadb_lifetime_addtime;
3668 dst->usetime = src->sadb_lifetime_usetime;
3669 }
3670 return dst;
3671 }
3672
3673 /* compare my own address
3674 * OUT: 1: true, i.e. my address.
3675 * 0: false
3676 */
3677 int
3678 key_ismyaddr(sa)
3679 struct sockaddr *sa;
3680 {
3681 #ifdef INET
3682 struct sockaddr_in *sin;
3683 struct in_ifaddr *ia;
3684 #endif
3685
3686 IPSEC_ASSERT(sa != NULL, ("null sockaddr"));
3687
3688 switch (sa->sa_family) {
3689 #ifdef INET
3690 case AF_INET:
3691 sin = (struct sockaddr_in *)sa;
3692 for (ia = in_ifaddrhead.tqh_first; ia;
3693 ia = ia->ia_link.tqe_next)
3694 {
3695 if (sin->sin_family == ia->ia_addr.sin_family &&
3696 sin->sin_len == ia->ia_addr.sin_len &&
3697 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
3698 {
3699 return 1;
3700 }
3701 }
3702 break;
3703 #endif
3704 #ifdef INET6
3705 case AF_INET6:
3706 return key_ismyaddr6((struct sockaddr_in6 *)sa);
3707 #endif
3708 }
3709
3710 return 0;
3711 }
3712
3713 #ifdef INET6
3714 /*
3715 * compare my own address for IPv6.
3716 * 1: ours
3717 * 0: other
3718 * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
3719 */
3720 #include <netinet6/in6_var.h>
3721
3722 static int
3723 key_ismyaddr6(sin6)
3724 struct sockaddr_in6 *sin6;
3725 {
3726 struct in6_ifaddr *ia;
3727 struct in6_multi *in6m;
3728
3729 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
3730 if (key_sockaddrcmp((struct sockaddr *)&sin6,
3731 (struct sockaddr *)&ia->ia_addr, 0) == 0)
3732 return 1;
3733
3734 /*
3735 * XXX Multicast
3736 * XXX why do we care about multlicast here while we don't care
3737 * about IPv4 multicast??
3738 * XXX scope
3739 */
3740 in6m = NULL;
3741 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
3742 if (in6m)
3743 return 1;
3744 }
3745
3746 /* loopback, just for safety */
3747 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
3748 return 1;
3749
3750 return 0;
3751 }
3752 #endif /*INET6*/
3753
3754 /*
3755 * compare two secasindex structure.
3756 * flag can specify to compare 2 saidxes.
3757 * compare two secasindex structure without both mode and reqid.
3758 * don't compare port.
3759 * IN:
3760 * saidx0: source, it can be in SAD.
3761 * saidx1: object.
3762 * OUT:
3763 * 1 : equal
3764 * 0 : not equal
3765 */
3766 static int
3767 key_cmpsaidx(
3768 const struct secasindex *saidx0,
3769 const struct secasindex *saidx1,
3770 int flag)
3771 {
3772 /* sanity */
3773 if (saidx0 == NULL && saidx1 == NULL)
3774 return 1;
3775
3776 if (saidx0 == NULL || saidx1 == NULL)
3777 return 0;
3778
3779 if (saidx0->proto != saidx1->proto)
3780 return 0;
3781
3782 if (flag == CMP_EXACTLY) {
3783 if (saidx0->mode != saidx1->mode)
3784 return 0;
3785 if (saidx0->reqid != saidx1->reqid)
3786 return 0;
3787 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 ||
3788 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0)
3789 return 0;
3790 } else {
3791
3792 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
3793 if (flag == CMP_MODE_REQID
3794 ||flag == CMP_REQID) {
3795 /*
3796 * If reqid of SPD is non-zero, unique SA is required.
3797 * The result must be of same reqid in this case.
3798 */
3799 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
3800 return 0;
3801 }
3802
3803 if (flag == CMP_MODE_REQID) {
3804 if (saidx0->mode != IPSEC_MODE_ANY
3805 && saidx0->mode != saidx1->mode)
3806 return 0;
3807 }
3808
3809 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) {
3810 return 0;
3811 }
3812 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) {
3813 return 0;
3814 }
3815 }
3816
3817 return 1;
3818 }
3819
3820 /*
3821 * compare two secindex structure exactly.
3822 * IN:
3823 * spidx0: source, it is often in SPD.
3824 * spidx1: object, it is often from PFKEY message.
3825 * OUT:
3826 * 1 : equal
3827 * 0 : not equal
3828 */
3829 static int
3830 key_cmpspidx_exactly(
3831 struct secpolicyindex *spidx0,
3832 struct secpolicyindex *spidx1)
3833 {
3834 /* sanity */
3835 if (spidx0 == NULL && spidx1 == NULL)
3836 return 1;
3837
3838 if (spidx0 == NULL || spidx1 == NULL)
3839 return 0;
3840
3841 if (spidx0->prefs != spidx1->prefs
3842 || spidx0->prefd != spidx1->prefd
3843 || spidx0->ul_proto != spidx1->ul_proto)
3844 return 0;
3845
3846 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
3847 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
3848 }
3849
3850 /*
3851 * compare two secindex structure with mask.
3852 * IN:
3853 * spidx0: source, it is often in SPD.
3854 * spidx1: object, it is often from IP header.
3855 * OUT:
3856 * 1 : equal
3857 * 0 : not equal
3858 */
3859 static int
3860 key_cmpspidx_withmask(
3861 struct secpolicyindex *spidx0,
3862 struct secpolicyindex *spidx1)
3863 {
3864 /* sanity */
3865 if (spidx0 == NULL && spidx1 == NULL)
3866 return 1;
3867
3868 if (spidx0 == NULL || spidx1 == NULL)
3869 return 0;
3870
3871 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
3872 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
3873 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
3874 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
3875 return 0;
3876
3877 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
3878 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
3879 && spidx0->ul_proto != spidx1->ul_proto)
3880 return 0;
3881
3882 switch (spidx0->src.sa.sa_family) {
3883 case AF_INET:
3884 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
3885 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
3886 return 0;
3887 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
3888 &spidx1->src.sin.sin_addr, spidx0->prefs))
3889 return 0;
3890 break;
3891 case AF_INET6:
3892 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
3893 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
3894 return 0;
3895 /*
3896 * scope_id check. if sin6_scope_id is 0, we regard it
3897 * as a wildcard scope, which matches any scope zone ID.
3898 */
3899 if (spidx0->src.sin6.sin6_scope_id &&
3900 spidx1->src.sin6.sin6_scope_id &&
3901 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
3902 return 0;
3903 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
3904 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
3905 return 0;
3906 break;
3907 default:
3908 /* XXX */
3909 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
3910 return 0;
3911 break;
3912 }
3913
3914 switch (spidx0->dst.sa.sa_family) {
3915 case AF_INET:
3916 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
3917 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
3918 return 0;
3919 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
3920 &spidx1->dst.sin.sin_addr, spidx0->prefd))
3921 return 0;
3922 break;
3923 case AF_INET6:
3924 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
3925 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
3926 return 0;
3927 /*
3928 * scope_id check. if sin6_scope_id is 0, we regard it
3929 * as a wildcard scope, which matches any scope zone ID.
3930 */
3931 if (spidx0->dst.sin6.sin6_scope_id &&
3932 spidx1->dst.sin6.sin6_scope_id &&
3933 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
3934 return 0;
3935 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
3936 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
3937 return 0;
3938 break;
3939 default:
3940 /* XXX */
3941 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
3942 return 0;
3943 break;
3944 }
3945
3946 /* XXX Do we check other field ? e.g. flowinfo */
3947
3948 return 1;
3949 }
3950
3951 /* returns 0 on match */
3952 static int
3953 key_sockaddrcmp(
3954 const struct sockaddr *sa1,
3955 const struct sockaddr *sa2,
3956 int port)
3957 {
3958 #ifdef satosin
3959 #undef satosin
3960 #endif
3961 #define satosin(s) ((const struct sockaddr_in *)s)
3962 #ifdef satosin6
3963 #undef satosin6
3964 #endif
3965 #define satosin6(s) ((const struct sockaddr_in6 *)s)
3966 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
3967 return 1;
3968
3969 switch (sa1->sa_family) {
3970 case AF_INET:
3971 if (sa1->sa_len != sizeof(struct sockaddr_in))
3972 return 1;
3973 if (satosin(sa1)->sin_addr.s_addr !=
3974 satosin(sa2)->sin_addr.s_addr) {
3975 return 1;
3976 }
3977 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
3978 return 1;
3979 break;
3980 case AF_INET6:
3981 if (sa1->sa_len != sizeof(struct sockaddr_in6))
3982 return 1; /*EINVAL*/
3983 if (satosin6(sa1)->sin6_scope_id !=
3984 satosin6(sa2)->sin6_scope_id) {
3985 return 1;
3986 }
3987 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
3988 &satosin6(sa2)->sin6_addr)) {
3989 return 1;
3990 }
3991 if (port &&
3992 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
3993 return 1;
3994 }
3995 break;
3996 default:
3997 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
3998 return 1;
3999 break;
4000 }
4001
4002 return 0;
4003 #undef satosin
4004 #undef satosin6
4005 }
4006
4007 /*
4008 * compare two buffers with mask.
4009 * IN:
4010 * addr1: source
4011 * addr2: object
4012 * bits: Number of bits to compare
4013 * OUT:
4014 * 1 : equal
4015 * 0 : not equal
4016 */
4017 static int
4018 key_bbcmp(const void *a1, const void *a2, u_int bits)
4019 {
4020 const unsigned char *p1 = a1;
4021 const unsigned char *p2 = a2;
4022
4023 /* XXX: This could be considerably faster if we compare a word
4024 * at a time, but it is complicated on LSB Endian machines */
4025
4026 /* Handle null pointers */
4027 if (p1 == NULL || p2 == NULL)
4028 return (p1 == p2);
4029
4030 while (bits >= 8) {
4031 if (*p1++ != *p2++)
4032 return 0;
4033 bits -= 8;
4034 }
4035
4036 if (bits > 0) {
4037 u_int8_t mask = ~((1<<(8-bits))-1);
4038 if ((*p1 & mask) != (*p2 & mask))
4039 return 0;
4040 }
4041 return 1; /* Match! */
4042 }
4043
4044 static void
4045 key_flush_spd(time_t now)
4046 {
4047 static u_int16_t sptree_scangen = 0;
4048 u_int16_t gen = sptree_scangen++;
4049 struct secpolicy *sp;
4050 u_int dir;
4051
4052 /* SPD */
4053 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
4054 restart:
4055 SPTREE_LOCK();
4056 LIST_FOREACH(sp, &sptree[dir], chain) {
4057 if (sp->scangen == gen) /* previously handled */
4058 continue;
4059 sp->scangen = gen;
4060 if (sp->state == IPSEC_SPSTATE_DEAD &&
4061 sp->refcnt == 1) {
4062 /*
4063 * Ensure that we only decrease refcnt once,
4064 * when we're the last consumer.
4065 * Directly call SP_DELREF/key_delsp instead
4066 * of KEY_FREESP to avoid unlocking/relocking
4067 * SPTREE_LOCK before key_delsp: may refcnt
4068 * be increased again during that time ?
4069 * NB: also clean entries created by
4070 * key_spdflush
4071 */
4072 SP_DELREF(sp);
4073 key_delsp(sp);
4074 SPTREE_UNLOCK();
4075 goto restart;
4076 }
4077 if (sp->lifetime == 0 && sp->validtime == 0)
4078 continue;
4079 if ((sp->lifetime && now - sp->created > sp->lifetime)
4080 || (sp->validtime && now - sp->lastused > sp->validtime)) {
4081 sp->state = IPSEC_SPSTATE_DEAD;
4082 SPTREE_UNLOCK();
4083 key_spdexpire(sp);
4084 goto restart;
4085 }
4086 }
4087 SPTREE_UNLOCK();
4088 }
4089 }
4090
4091 static void
4092 key_flush_sad(time_t now)
4093 {
4094 struct secashead *sah, *nextsah;
4095 struct secasvar *sav, *nextsav;
4096
4097 /* SAD */
4098 SAHTREE_LOCK();
4099 LIST_FOREACH_SAFE(sah, &sahtree, chain, nextsah) {
4100 /* if sah has been dead, then delete it and process next sah. */
4101 if (sah->state == SADB_SASTATE_DEAD) {
4102 key_delsah(sah);
4103 continue;
4104 }
4105
4106 /* if LARVAL entry doesn't become MATURE, delete it. */
4107 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) {
4108 /* Need to also check refcnt for a larval SA ??? */
4109 if (now - sav->created > key_larval_lifetime)
4110 KEY_FREESAV(&sav);
4111 }
4112
4113 /*
4114 * check MATURE entry to start to send expire message
4115 * whether or not.
4116 */
4117 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) {
4118 /* we don't need to check. */
4119 if (sav->lft_s == NULL)
4120 continue;
4121
4122 /* sanity check */
4123 if (sav->lft_c == NULL) {
4124 ipseclog((LOG_DEBUG,"%s: there is no CURRENT "
4125 "time, why?\n", __func__));
4126 continue;
4127 }
4128
4129 /* check SOFT lifetime */
4130 if (sav->lft_s->addtime != 0 &&
4131 now - sav->created > sav->lft_s->addtime) {
4132 key_sa_chgstate(sav, SADB_SASTATE_DYING);
4133 /*
4134 * Actually, only send expire message if
4135 * SA has been used, as it was done before,
4136 * but should we always send such message,
4137 * and let IKE daemon decide if it should be
4138 * renegotiated or not ?
4139 * XXX expire message will actually NOT be
4140 * sent if SA is only used after soft
4141 * lifetime has been reached, see below
4142 * (DYING state)
4143 */
4144 if (sav->lft_c->usetime != 0)
4145 key_expire(sav);
4146 }
4147 /* check SOFT lifetime by bytes */
4148 /*
4149 * XXX I don't know the way to delete this SA
4150 * when new SA is installed. Caution when it's
4151 * installed too big lifetime by time.
4152 */
4153 else if (sav->lft_s->bytes != 0 &&
4154 sav->lft_s->bytes < sav->lft_c->bytes) {
4155
4156 key_sa_chgstate(sav, SADB_SASTATE_DYING);
4157 /*
4158 * XXX If we keep to send expire
4159 * message in the status of
4160 * DYING. Do remove below code.
4161 */
4162 key_expire(sav);
4163 }
4164 }
4165
4166 /* check DYING entry to change status to DEAD. */
4167 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) {
4168 /* we don't need to check. */
4169 if (sav->lft_h == NULL)
4170 continue;
4171
4172 /* sanity check */
4173 if (sav->lft_c == NULL) {
4174 ipseclog((LOG_DEBUG, "%s: there is no CURRENT "
4175 "time, why?\n", __func__));
4176 continue;
4177 }
4178
4179 if (sav->lft_h->addtime != 0 &&
4180 now - sav->created > sav->lft_h->addtime) {
4181 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4182 KEY_FREESAV(&sav);
4183 }
4184 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */
4185 else if (sav->lft_s != NULL
4186 && sav->lft_s->addtime != 0
4187 && now - sav->created > sav->lft_s->addtime) {
4188 /*
4189 * XXX: should be checked to be
4190 * installed the valid SA.
4191 */
4192
4193 /*
4194 * If there is no SA then sending
4195 * expire message.
4196 */
4197 key_expire(sav);
4198 }
4199 #endif
4200 /* check HARD lifetime by bytes */
4201 else if (sav->lft_h->bytes != 0 &&
4202 sav->lft_h->bytes < sav->lft_c->bytes) {
4203 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4204 KEY_FREESAV(&sav);
4205 }
4206 }
4207
4208 /* delete entry in DEAD */
4209 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) {
4210 /* sanity check */
4211 if (sav->state != SADB_SASTATE_DEAD) {
4212 ipseclog((LOG_DEBUG, "%s: invalid sav->state "
4213 "(queue: %d SA: %d): kill it anyway\n",
4214 __func__,
4215 SADB_SASTATE_DEAD, sav->state));
4216 }
4217 /*
4218 * do not call key_freesav() here.
4219 * sav should already be freed, and sav->refcnt
4220 * shows other references to sav
4221 * (such as from SPD).
4222 */
4223 }
4224 }
4225 SAHTREE_UNLOCK();
4226 }
4227
4228 static void
4229 key_flush_acq(time_t now)
4230 {
4231 struct secacq *acq, *nextacq;
4232
4233 /* ACQ tree */
4234 ACQ_LOCK();
4235 for (acq = LIST_FIRST(&acqtree); acq != NULL; acq = nextacq) {
4236 nextacq = LIST_NEXT(acq, chain);
4237 if (now - acq->created > key_blockacq_lifetime
4238 && __LIST_CHAINED(acq)) {
4239 LIST_REMOVE(acq, chain);
4240 free(acq, M_IPSEC_SAQ);
4241 }
4242 }
4243 ACQ_UNLOCK();
4244 }
4245
4246 static void
4247 key_flush_spacq(time_t now)
4248 {
4249 struct secspacq *acq, *nextacq;
4250
4251 /* SP ACQ tree */
4252 SPACQ_LOCK();
4253 for (acq = LIST_FIRST(&spacqtree); acq != NULL; acq = nextacq) {
4254 nextacq = LIST_NEXT(acq, chain);
4255 if (now - acq->created > key_blockacq_lifetime
4256 && __LIST_CHAINED(acq)) {
4257 LIST_REMOVE(acq, chain);
4258 free(acq, M_IPSEC_SAQ);
4259 }
4260 }
4261 SPACQ_UNLOCK();
4262 }
4263
4264 /*
4265 * time handler.
4266 * scanning SPD and SAD to check status for each entries,
4267 * and do to remove or to expire.
4268 * XXX: year 2038 problem may remain.
4269 */
4270 void
4271 key_timehandler(void)
4272 {
4273 time_t now = time_second;
4274
4275 key_flush_spd(now);
4276 key_flush_sad(now);
4277 key_flush_acq(now);
4278 key_flush_spacq(now);
4279
4280 #ifndef IPSEC_DEBUG2
4281 /* do exchange to tick time !! */
4282 (void)timeout((void *)key_timehandler, (void *)0, hz);
4283 #endif /* IPSEC_DEBUG2 */
4284 }
4285
4286 u_long
4287 key_random()
4288 {
4289 u_long value;
4290
4291 key_randomfill(&value, sizeof(value));
4292 return value;
4293 }
4294
4295 void
4296 key_randomfill(p, l)
4297 void *p;
4298 size_t l;
4299 {
4300 size_t n;
4301 u_long v;
4302 static int warn = 1;
4303
4304 n = 0;
4305 n = (size_t)read_random(p, (u_int)l);
4306 /* last resort */
4307 while (n < l) {
4308 v = random();
4309 bcopy(&v, (u_int8_t *)p + n,
4310 l - n < sizeof(v) ? l - n : sizeof(v));
4311 n += sizeof(v);
4312
4313 if (warn) {
4314 printf("WARNING: pseudo-random number generator "
4315 "used for IPsec processing\n");
4316 warn = 0;
4317 }
4318 }
4319 }
4320
4321 /*
4322 * map SADB_SATYPE_* to IPPROTO_*.
4323 * if satype == SADB_SATYPE then satype is mapped to ~0.
4324 * OUT:
4325 * 0: invalid satype.
4326 */
4327 static u_int16_t
4328 key_satype2proto(u_int8_t satype)
4329 {
4330 switch (satype) {
4331 case SADB_SATYPE_UNSPEC:
4332 return IPSEC_PROTO_ANY;
4333 case SADB_SATYPE_AH:
4334 return IPPROTO_AH;
4335 case SADB_SATYPE_ESP:
4336 return IPPROTO_ESP;
4337 case SADB_X_SATYPE_IPCOMP:
4338 return IPPROTO_IPCOMP;
4339 case SADB_X_SATYPE_TCPSIGNATURE:
4340 return IPPROTO_TCP;
4341 default:
4342 return 0;
4343 }
4344 /* NOTREACHED */
4345 }
4346
4347 /*
4348 * map IPPROTO_* to SADB_SATYPE_*
4349 * OUT:
4350 * 0: invalid protocol type.
4351 */
4352 static u_int8_t
4353 key_proto2satype(u_int16_t proto)
4354 {
4355 switch (proto) {
4356 case IPPROTO_AH:
4357 return SADB_SATYPE_AH;
4358 case IPPROTO_ESP:
4359 return SADB_SATYPE_ESP;
4360 case IPPROTO_IPCOMP:
4361 return SADB_X_SATYPE_IPCOMP;
4362 case IPPROTO_TCP:
4363 return SADB_X_SATYPE_TCPSIGNATURE;
4364 default:
4365 return 0;
4366 }
4367 /* NOTREACHED */
4368 }
4369
4370 /* %%% PF_KEY */
4371 /*
4372 * SADB_GETSPI processing is to receive
4373 * <base, (SA2), src address, dst address, (SPI range)>
4374 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4375 * tree with the status of LARVAL, and send
4376 * <base, SA(*), address(SD)>
4377 * to the IKMPd.
4378 *
4379 * IN: mhp: pointer to the pointer to each header.
4380 * OUT: NULL if fail.
4381 * other if success, return pointer to the message to send.
4382 */
4383 static int
4384 key_getspi(so, m, mhp)
4385 struct socket *so;
4386 struct mbuf *m;
4387 const struct sadb_msghdr *mhp;
4388 {
4389 struct sadb_address *src0, *dst0;
4390 struct secasindex saidx;
4391 struct secashead *newsah;
4392 struct secasvar *newsav;
4393 u_int8_t proto;
4394 u_int32_t spi;
4395 u_int8_t mode;
4396 u_int32_t reqid;
4397 int error;
4398
4399 IPSEC_ASSERT(so != NULL, ("null socket"));
4400 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4401 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4402 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4403
4404 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4405 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
4406 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4407 __func__));
4408 return key_senderror(so, m, EINVAL);
4409 }
4410 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4411 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4412 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4413 __func__));
4414 return key_senderror(so, m, EINVAL);
4415 }
4416 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4417 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4418 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4419 } else {
4420 mode = IPSEC_MODE_ANY;
4421 reqid = 0;
4422 }
4423
4424 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4425 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4426
4427 /* map satype to proto */
4428 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4429 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4430 __func__));
4431 return key_senderror(so, m, EINVAL);
4432 }
4433
4434 /* make sure if port number is zero. */
4435 switch (((struct sockaddr *)(src0 + 1))->sa_family) {
4436 case AF_INET:
4437 if (((struct sockaddr *)(src0 + 1))->sa_len !=
4438 sizeof(struct sockaddr_in))
4439 return key_senderror(so, m, EINVAL);
4440 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
4441 break;
4442 case AF_INET6:
4443 if (((struct sockaddr *)(src0 + 1))->sa_len !=
4444 sizeof(struct sockaddr_in6))
4445 return key_senderror(so, m, EINVAL);
4446 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
4447 break;
4448 default:
4449 ; /*???*/
4450 }
4451 switch (((struct sockaddr *)(dst0 + 1))->sa_family) {
4452 case AF_INET:
4453 if (((struct sockaddr *)(dst0 + 1))->sa_len !=
4454 sizeof(struct sockaddr_in))
4455 return key_senderror(so, m, EINVAL);
4456 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
4457 break;
4458 case AF_INET6:
4459 if (((struct sockaddr *)(dst0 + 1))->sa_len !=
4460 sizeof(struct sockaddr_in6))
4461 return key_senderror(so, m, EINVAL);
4462 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
4463 break;
4464 default:
4465 ; /*???*/
4466 }
4467
4468 /* XXX boundary check against sa_len */
4469 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4470
4471 /* SPI allocation */
4472 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE],
4473 &saidx);
4474 if (spi == 0)
4475 return key_senderror(so, m, EINVAL);
4476
4477 /* get a SA index */
4478 if ((newsah = key_getsah(&saidx)) == NULL) {
4479 /* create a new SA index */
4480 if ((newsah = key_newsah(&saidx)) == NULL) {
4481 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
4482 return key_senderror(so, m, ENOBUFS);
4483 }
4484 }
4485
4486 /* get a new SA */
4487 /* XXX rewrite */
4488 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4489 if (newsav == NULL) {
4490 /* XXX don't free new SA index allocated in above. */
4491 return key_senderror(so, m, error);
4492 }
4493
4494 /* set spi */
4495 newsav->spi = htonl(spi);
4496
4497 /* delete the entry in acqtree */
4498 if (mhp->msg->sadb_msg_seq != 0) {
4499 struct secacq *acq;
4500 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
4501 /* reset counter in order to deletion by timehandler. */
4502 acq->created = time_second;
4503 acq->count = 0;
4504 }
4505 }
4506
4507 {
4508 struct mbuf *n, *nn;
4509 struct sadb_sa *m_sa;
4510 struct sadb_msg *newmsg;
4511 int off, len;
4512
4513 /* create new sadb_msg to reply. */
4514 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4515 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4516
4517 MGETHDR(n, M_DONTWAIT, MT_DATA);
4518 if (len > MHLEN) {
4519 MCLGET(n, M_DONTWAIT);
4520 if ((n->m_flags & M_EXT) == 0) {
4521 m_freem(n);
4522 n = NULL;
4523 }
4524 }
4525 if (!n)
4526 return key_senderror(so, m, ENOBUFS);
4527
4528 n->m_len = len;
4529 n->m_next = NULL;
4530 off = 0;
4531
4532 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
4533 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
4534
4535 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
4536 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
4537 m_sa->sadb_sa_exttype = SADB_EXT_SA;
4538 m_sa->sadb_sa_spi = htonl(spi);
4539 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
4540
4541 IPSEC_ASSERT(off == len,
4542 ("length inconsistency (off %u len %u)", off, len));
4543
4544 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
4545 SADB_EXT_ADDRESS_DST);
4546 if (!n->m_next) {
4547 m_freem(n);
4548 return key_senderror(so, m, ENOBUFS);
4549 }
4550
4551 if (n->m_len < sizeof(struct sadb_msg)) {
4552 n = m_pullup(n, sizeof(struct sadb_msg));
4553 if (n == NULL)
4554 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
4555 }
4556
4557 n->m_pkthdr.len = 0;
4558 for (nn = n; nn; nn = nn->m_next)
4559 n->m_pkthdr.len += nn->m_len;
4560
4561 newmsg = mtod(n, struct sadb_msg *);
4562 newmsg->sadb_msg_seq = newsav->seq;
4563 newmsg->sadb_msg_errno = 0;
4564 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4565
4566 m_freem(m);
4567 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
4568 }
4569 }
4570
4571 /*
4572 * allocating new SPI
4573 * called by key_getspi().
4574 * OUT:
4575 * 0: failure.
4576 * others: success.
4577 */
4578 static u_int32_t
4579 key_do_getnewspi(spirange, saidx)
4580 struct sadb_spirange *spirange;
4581 struct secasindex *saidx;
4582 {
4583 u_int32_t newspi;
4584 u_int32_t min, max;
4585 int count = key_spi_trycnt;
4586
4587 /* set spi range to allocate */
4588 if (spirange != NULL) {
4589 min = spirange->sadb_spirange_min;
4590 max = spirange->sadb_spirange_max;
4591 } else {
4592 min = key_spi_minval;
4593 max = key_spi_maxval;
4594 }
4595 /* IPCOMP needs 2-byte SPI */
4596 if (saidx->proto == IPPROTO_IPCOMP) {
4597 u_int32_t t;
4598 if (min >= 0x10000)
4599 min = 0xffff;
4600 if (max >= 0x10000)
4601 max = 0xffff;
4602 if (min > max) {
4603 t = min; min = max; max = t;
4604 }
4605 }
4606
4607 if (min == max) {
4608 if (key_checkspidup(saidx, min) != NULL) {
4609 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n",
4610 __func__, min));
4611 return 0;
4612 }
4613
4614 count--; /* taking one cost. */
4615 newspi = min;
4616
4617 } else {
4618
4619 /* init SPI */
4620 newspi = 0;
4621
4622 /* when requesting to allocate spi ranged */
4623 while (count--) {
4624 /* generate pseudo-random SPI value ranged. */
4625 newspi = min + (key_random() % (max - min + 1));
4626
4627 if (key_checkspidup(saidx, newspi) == NULL)
4628 break;
4629 }
4630
4631 if (count == 0 || newspi == 0) {
4632 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n",
4633 __func__));
4634 return 0;
4635 }
4636 }
4637
4638 /* statistics */
4639 keystat.getspi_count =
4640 (keystat.getspi_count + key_spi_trycnt - count) / 2;
4641
4642 return newspi;
4643 }
4644
4645 /*
4646 * SADB_UPDATE processing
4647 * receive
4648 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4649 * key(AE), (identity(SD),) (sensitivity)>
4650 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
4651 * and send
4652 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4653 * (identity(SD),) (sensitivity)>
4654 * to the ikmpd.
4655 *
4656 * m will always be freed.
4657 */
4658 static int
4659 key_update(so, m, mhp)
4660 struct socket *so;
4661 struct mbuf *m;
4662 const struct sadb_msghdr *mhp;
4663 {
4664 struct sadb_sa *sa0;
4665 struct sadb_address *src0, *dst0;
4666 struct secasindex saidx;
4667 struct secashead *sah;
4668 struct secasvar *sav;
4669 u_int16_t proto;
4670 u_int8_t mode;
4671 u_int32_t reqid;
4672 int error;
4673
4674 IPSEC_ASSERT(so != NULL, ("null socket"));
4675 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4676 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4677 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4678
4679 /* map satype to proto */
4680 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4681 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4682 __func__));
4683 return key_senderror(so, m, EINVAL);
4684 }
4685
4686 if (mhp->ext[SADB_EXT_SA] == NULL ||
4687 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4688 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4689 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4690 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4691 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4692 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4693 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4694 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4695 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4696 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4697 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4698 __func__));
4699 return key_senderror(so, m, EINVAL);
4700 }
4701 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4702 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4703 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4704 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4705 __func__));
4706 return key_senderror(so, m, EINVAL);
4707 }
4708 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4709 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4710 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4711 } else {
4712 mode = IPSEC_MODE_ANY;
4713 reqid = 0;
4714 }
4715 /* XXX boundary checking for other extensions */
4716
4717 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4718 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4719 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4720
4721 /* XXX boundary check against sa_len */
4722 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4723
4724 /* get a SA header */
4725 if ((sah = key_getsah(&saidx)) == NULL) {
4726 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__));
4727 return key_senderror(so, m, ENOENT);
4728 }
4729
4730 /* set spidx if there */
4731 /* XXX rewrite */
4732 error = key_setident(sah, m, mhp);
4733 if (error)
4734 return key_senderror(so, m, error);
4735
4736 /* find a SA with sequence number. */
4737 #ifdef IPSEC_DOSEQCHECK
4738 if (mhp->msg->sadb_msg_seq != 0
4739 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
4740 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u "
4741 "exists.\n", __func__, mhp->msg->sadb_msg_seq));
4742 return key_senderror(so, m, ENOENT);
4743 }
4744 #else
4745 SAHTREE_LOCK();
4746 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
4747 SAHTREE_UNLOCK();
4748 if (sav == NULL) {
4749 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n",
4750 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4751 return key_senderror(so, m, EINVAL);
4752 }
4753 #endif
4754
4755 /* validity check */
4756 if (sav->sah->saidx.proto != proto) {
4757 ipseclog((LOG_DEBUG, "%s: protocol mismatched "
4758 "(DB=%u param=%u)\n", __func__,
4759 sav->sah->saidx.proto, proto));
4760 return key_senderror(so, m, EINVAL);
4761 }
4762 #ifdef IPSEC_DOSEQCHECK
4763 if (sav->spi != sa0->sadb_sa_spi) {
4764 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n",
4765 __func__,
4766 (u_int32_t)ntohl(sav->spi),
4767 (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4768 return key_senderror(so, m, EINVAL);
4769 }
4770 #endif
4771 if (sav->pid != mhp->msg->sadb_msg_pid) {
4772 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n",
4773 __func__, sav->pid, mhp->msg->sadb_msg_pid));
4774 return key_senderror(so, m, EINVAL);
4775 }
4776
4777 /* copy sav values */
4778 error = key_setsaval(sav, m, mhp);
4779 if (error) {
4780 KEY_FREESAV(&sav);
4781 return key_senderror(so, m, error);
4782 }
4783
4784 /* check SA values to be mature. */
4785 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) {
4786 KEY_FREESAV(&sav);
4787 return key_senderror(so, m, 0);
4788 }
4789
4790 {
4791 struct mbuf *n;
4792
4793 /* set msg buf from mhp */
4794 n = key_getmsgbuf_x1(m, mhp);
4795 if (n == NULL) {
4796 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4797 return key_senderror(so, m, ENOBUFS);
4798 }
4799
4800 m_freem(m);
4801 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4802 }
4803 }
4804
4805 /*
4806 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
4807 * only called by key_update().
4808 * OUT:
4809 * NULL : not found
4810 * others : found, pointer to a SA.
4811 */
4812 #ifdef IPSEC_DOSEQCHECK
4813 static struct secasvar *
4814 key_getsavbyseq(sah, seq)
4815 struct secashead *sah;
4816 u_int32_t seq;
4817 {
4818 struct secasvar *sav;
4819 u_int state;
4820
4821 state = SADB_SASTATE_LARVAL;
4822
4823 /* search SAD with sequence number ? */
4824 LIST_FOREACH(sav, &sah->savtree[state], chain) {
4825
4826 KEY_CHKSASTATE(state, sav->state, __func__);
4827
4828 if (sav->seq == seq) {
4829 sa_addref(sav);
4830 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
4831 printf("DP %s cause refcnt++:%d SA:%p\n",
4832 __func__, sav->refcnt, sav));
4833 return sav;
4834 }
4835 }
4836
4837 return NULL;
4838 }
4839 #endif
4840
4841 /*
4842 * SADB_ADD processing
4843 * add an entry to SA database, when received
4844 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4845 * key(AE), (identity(SD),) (sensitivity)>
4846 * from the ikmpd,
4847 * and send
4848 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4849 * (identity(SD),) (sensitivity)>
4850 * to the ikmpd.
4851 *
4852 * IGNORE identity and sensitivity messages.
4853 *
4854 * m will always be freed.
4855 */
4856 static int
4857 key_add(so, m, mhp)
4858 struct socket *so;
4859 struct mbuf *m;
4860 const struct sadb_msghdr *mhp;
4861 {
4862 struct sadb_sa *sa0;
4863 struct sadb_address *src0, *dst0;
4864 struct secasindex saidx;
4865 struct secashead *newsah;
4866 struct secasvar *newsav;
4867 u_int16_t proto;
4868 u_int8_t mode;
4869 u_int32_t reqid;
4870 int error;
4871
4872 IPSEC_ASSERT(so != NULL, ("null socket"));
4873 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4874 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4875 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4876
4877 /* map satype to proto */
4878 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4879 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
4880 __func__));
4881 return key_senderror(so, m, EINVAL);
4882 }
4883
4884 if (mhp->ext[SADB_EXT_SA] == NULL ||
4885 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4886 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4887 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4888 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4889 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4890 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4891 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4892 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4893 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4894 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4895 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4896 __func__));
4897 return key_senderror(so, m, EINVAL);
4898 }
4899 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4900 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4901 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4902 /* XXX need more */
4903 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
4904 __func__));
4905 return key_senderror(so, m, EINVAL);
4906 }
4907 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4908 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4909 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4910 } else {
4911 mode = IPSEC_MODE_ANY;
4912 reqid = 0;
4913 }
4914
4915 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4916 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
4917 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
4918
4919 /* XXX boundary check against sa_len */
4920 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4921
4922 /* get a SA header */
4923 if ((newsah = key_getsah(&saidx)) == NULL) {
4924 /* create a new SA header */
4925 if ((newsah = key_newsah(&saidx)) == NULL) {
4926 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__));
4927 return key_senderror(so, m, ENOBUFS);
4928 }
4929 }
4930
4931 /* set spidx if there */
4932 /* XXX rewrite */
4933 error = key_setident(newsah, m, mhp);
4934 if (error) {
4935 return key_senderror(so, m, error);
4936 }
4937
4938 /* create new SA entry. */
4939 /* We can create new SA only if SPI is differenct. */
4940 SAHTREE_LOCK();
4941 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi);
4942 SAHTREE_UNLOCK();
4943 if (newsav != NULL) {
4944 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__));
4945 return key_senderror(so, m, EEXIST);
4946 }
4947 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4948 if (newsav == NULL) {
4949 return key_senderror(so, m, error);
4950 }
4951
4952 /* check SA values to be mature. */
4953 if ((error = key_mature(newsav)) != 0) {
4954 KEY_FREESAV(&newsav);
4955 return key_senderror(so, m, error);
4956 }
4957
4958 /*
4959 * don't call key_freesav() here, as we would like to keep the SA
4960 * in the database on success.
4961 */
4962
4963 {
4964 struct mbuf *n;
4965
4966 /* set msg buf from mhp */
4967 n = key_getmsgbuf_x1(m, mhp);
4968 if (n == NULL) {
4969 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
4970 return key_senderror(so, m, ENOBUFS);
4971 }
4972
4973 m_freem(m);
4974 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4975 }
4976 }
4977
4978 /* m is retained */
4979 static int
4980 key_setident(sah, m, mhp)
4981 struct secashead *sah;
4982 struct mbuf *m;
4983 const struct sadb_msghdr *mhp;
4984 {
4985 const struct sadb_ident *idsrc, *iddst;
4986 int idsrclen, iddstlen;
4987
4988 IPSEC_ASSERT(sah != NULL, ("null secashead"));
4989 IPSEC_ASSERT(m != NULL, ("null mbuf"));
4990 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
4991 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
4992
4993 /* don't make buffer if not there */
4994 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
4995 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
4996 sah->idents = NULL;
4997 sah->identd = NULL;
4998 return 0;
4999 }
5000
5001 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
5002 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
5003 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__));
5004 return EINVAL;
5005 }
5006
5007 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
5008 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
5009 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
5010 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];
5011
5012 /* validity check */
5013 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
5014 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__));
5015 return EINVAL;
5016 }
5017
5018 switch (idsrc->sadb_ident_type) {
5019 case SADB_IDENTTYPE_PREFIX:
5020 case SADB_IDENTTYPE_FQDN:
5021 case SADB_IDENTTYPE_USERFQDN:
5022 default:
5023 /* XXX do nothing */
5024 sah->idents = NULL;
5025 sah->identd = NULL;
5026 return 0;
5027 }
5028
5029 /* make structure */
5030 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5031 if (sah->idents == NULL) {
5032 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5033 return ENOBUFS;
5034 }
5035 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT);
5036 if (sah->identd == NULL) {
5037 free(sah->idents, M_IPSEC_MISC);
5038 sah->idents = NULL;
5039 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5040 return ENOBUFS;
5041 }
5042 sah->idents->type = idsrc->sadb_ident_type;
5043 sah->idents->id = idsrc->sadb_ident_id;
5044
5045 sah->identd->type = iddst->sadb_ident_type;
5046 sah->identd->id = iddst->sadb_ident_id;
5047
5048 return 0;
5049 }
5050
5051 /*
5052 * m will not be freed on return.
5053 * it is caller's responsibility to free the result.
5054 */
5055 static struct mbuf *
5056 key_getmsgbuf_x1(m, mhp)
5057 struct mbuf *m;
5058 const struct sadb_msghdr *mhp;
5059 {
5060 struct mbuf *n;
5061
5062 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5063 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5064 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5065
5066 /* create new sadb_msg to reply. */
5067 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
5068 SADB_EXT_SA, SADB_X_EXT_SA2,
5069 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
5070 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
5071 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
5072 if (!n)
5073 return NULL;
5074
5075 if (n->m_len < sizeof(struct sadb_msg)) {
5076 n = m_pullup(n, sizeof(struct sadb_msg));
5077 if (n == NULL)
5078 return NULL;
5079 }
5080 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
5081 mtod(n, struct sadb_msg *)->sadb_msg_len =
5082 PFKEY_UNIT64(n->m_pkthdr.len);
5083
5084 return n;
5085 }
5086
5087 static int key_delete_all __P((struct socket *, struct mbuf *,
5088 const struct sadb_msghdr *, u_int16_t));
5089
5090 /*
5091 * SADB_DELETE processing
5092 * receive
5093 * <base, SA(*), address(SD)>
5094 * from the ikmpd, and set SADB_SASTATE_DEAD,
5095 * and send,
5096 * <base, SA(*), address(SD)>
5097 * to the ikmpd.
5098 *
5099 * m will always be freed.
5100 */
5101 static int
5102 key_delete(so, m, mhp)
5103 struct socket *so;
5104 struct mbuf *m;
5105 const struct sadb_msghdr *mhp;
5106 {
5107 struct sadb_sa *sa0;
5108 struct sadb_address *src0, *dst0;
5109 struct secasindex saidx;
5110 struct secashead *sah;
5111 struct secasvar *sav = NULL;
5112 u_int16_t proto;
5113
5114 IPSEC_ASSERT(so != NULL, ("null socket"));
5115 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5116 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5117 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5118
5119 /* map satype to proto */
5120 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5121 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5122 __func__));
5123 return key_senderror(so, m, EINVAL);
5124 }
5125
5126 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5127 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
5128 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5129 __func__));
5130 return key_senderror(so, m, EINVAL);
5131 }
5132
5133 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5134 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
5135 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5136 __func__));
5137 return key_senderror(so, m, EINVAL);
5138 }
5139
5140 if (mhp->ext[SADB_EXT_SA] == NULL) {
5141 /*
5142 * Caller wants us to delete all non-LARVAL SAs
5143 * that match the src/dst. This is used during
5144 * IKE INITIAL-CONTACT.
5145 */
5146 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__));
5147 return key_delete_all(so, m, mhp, proto);
5148 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
5149 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5150 __func__));
5151 return key_senderror(so, m, EINVAL);
5152 }
5153
5154 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5155 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5156 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5157
5158 /* XXX boundary check against sa_len */
5159 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5160
5161 /* get a SA header */
5162 SAHTREE_LOCK();
5163 LIST_FOREACH(sah, &sahtree, chain) {
5164 if (sah->state == SADB_SASTATE_DEAD)
5165 continue;
5166 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
5167 continue;
5168
5169 /* get a SA with SPI. */
5170 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
5171 if (sav)
5172 break;
5173 }
5174 if (sah == NULL) {
5175 SAHTREE_UNLOCK();
5176 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
5177 return key_senderror(so, m, ENOENT);
5178 }
5179
5180 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
5181 SAHTREE_UNLOCK();
5182 KEY_FREESAV(&sav);
5183
5184 {
5185 struct mbuf *n;
5186 struct sadb_msg *newmsg;
5187
5188 /* create new sadb_msg to reply. */
5189 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
5190 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
5191 if (!n)
5192 return key_senderror(so, m, ENOBUFS);
5193
5194 if (n->m_len < sizeof(struct sadb_msg)) {
5195 n = m_pullup(n, sizeof(struct sadb_msg));
5196 if (n == NULL)
5197 return key_senderror(so, m, ENOBUFS);
5198 }
5199 newmsg = mtod(n, struct sadb_msg *);
5200 newmsg->sadb_msg_errno = 0;
5201 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5202
5203 m_freem(m);
5204 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5205 }
5206 }
5207
5208 /*
5209 * delete all SAs for src/dst. Called from key_delete().
5210 */
5211 static int
5212 key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp,
5213 u_int16_t proto)
5214 {
5215 struct sadb_address *src0, *dst0;
5216 struct secasindex saidx;
5217 struct secashead *sah;
5218 struct secasvar *sav, *nextsav;
5219 u_int stateidx, state;
5220
5221 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
5222 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
5223
5224 /* XXX boundary check against sa_len */
5225 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5226
5227 SAHTREE_LOCK();
5228 LIST_FOREACH(sah, &sahtree, chain) {
5229 if (sah->state == SADB_SASTATE_DEAD)
5230 continue;
5231 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
5232 continue;
5233
5234 /* Delete all non-LARVAL SAs. */
5235 for (stateidx = 0;
5236 stateidx < _ARRAYLEN(saorder_state_alive);
5237 stateidx++) {
5238 state = saorder_state_alive[stateidx];
5239 if (state == SADB_SASTATE_LARVAL)
5240 continue;
5241 for (sav = LIST_FIRST(&sah->savtree[state]);
5242 sav != NULL; sav = nextsav) {
5243 nextsav = LIST_NEXT(sav, chain);
5244 /* sanity check */
5245 if (sav->state != state) {
5246 ipseclog((LOG_DEBUG, "%s: invalid "
5247 "sav->state (queue %d SA %d)\n",
5248 __func__, state, sav->state));
5249 continue;
5250 }
5251
5252 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
5253 KEY_FREESAV(&sav);
5254 }
5255 }
5256 }
5257 SAHTREE_UNLOCK();
5258 {
5259 struct mbuf *n;
5260 struct sadb_msg *newmsg;
5261
5262 /* create new sadb_msg to reply. */
5263 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
5264 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
5265 if (!n)
5266 return key_senderror(so, m, ENOBUFS);
5267
5268 if (n->m_len < sizeof(struct sadb_msg)) {
5269 n = m_pullup(n, sizeof(struct sadb_msg));
5270 if (n == NULL)
5271 return key_senderror(so, m, ENOBUFS);
5272 }
5273 newmsg = mtod(n, struct sadb_msg *);
5274 newmsg->sadb_msg_errno = 0;
5275 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5276
5277 m_freem(m);
5278 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5279 }
5280 }
5281
5282 /*
5283 * SADB_GET processing
5284 * receive
5285 * <base, SA(*), address(SD)>
5286 * from the ikmpd, and get a SP and a SA to respond,
5287 * and send,
5288 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
5289 * (identity(SD),) (sensitivity)>
5290 * to the ikmpd.
5291 *
5292 * m will always be freed.
5293 */
5294 static int
5295 key_get(so, m, mhp)
5296 struct socket *so;
5297 struct mbuf *m;
5298 const struct sadb_msghdr *mhp;
5299 {
5300 struct sadb_sa *sa0;
5301 struct sadb_address *src0, *dst0;
5302 struct secasindex saidx;
5303 struct secashead *sah;
5304 struct secasvar *sav = NULL;
5305 u_int16_t proto;
5306
5307 IPSEC_ASSERT(so != NULL, ("null socket"));
5308 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5309 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5310 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5311
5312 /* map satype to proto */
5313 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5314 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
5315 __func__));
5316 return key_senderror(so, m, EINVAL);
5317 }
5318
5319 if (mhp->ext[SADB_EXT_SA] == NULL ||
5320 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5321 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
5322 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5323 __func__));
5324 return key_senderror(so, m, EINVAL);
5325 }
5326 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
5327 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5328 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
5329 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
5330 __func__));
5331 return key_senderror(so, m, EINVAL);
5332 }
5333
5334 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5335 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5336 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5337
5338 /* XXX boundary check against sa_len */
5339 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5340
5341 /* get a SA header */
5342 SAHTREE_LOCK();
5343 LIST_FOREACH(sah, &sahtree, chain) {
5344 if (sah->state == SADB_SASTATE_DEAD)
5345 continue;
5346 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
5347 continue;
5348
5349 /* get a SA with SPI. */
5350 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
5351 if (sav)
5352 break;
5353 }
5354 SAHTREE_UNLOCK();
5355 if (sah == NULL) {
5356 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__));
5357 return key_senderror(so, m, ENOENT);
5358 }
5359
5360 {
5361 struct mbuf *n;
5362 u_int8_t satype;
5363
5364 /* map proto to satype */
5365 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
5366 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n",
5367 __func__));
5368 return key_senderror(so, m, EINVAL);
5369 }
5370
5371 /* create new sadb_msg to reply. */
5372 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
5373 mhp->msg->sadb_msg_pid);
5374 if (!n)
5375 return key_senderror(so, m, ENOBUFS);
5376
5377 m_freem(m);
5378 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5379 }
5380 }
5381
5382 /* XXX make it sysctl-configurable? */
5383 static void
5384 key_getcomb_setlifetime(comb)
5385 struct sadb_comb *comb;
5386 {
5387
5388 comb->sadb_comb_soft_allocations = 1;
5389 comb->sadb_comb_hard_allocations = 1;
5390 comb->sadb_comb_soft_bytes = 0;
5391 comb->sadb_comb_hard_bytes = 0;
5392 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
5393 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
5394 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
5395 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
5396 }
5397
5398 /*
5399 * XXX reorder combinations by preference
5400 * XXX no idea if the user wants ESP authentication or not
5401 */
5402 static struct mbuf *
5403 key_getcomb_esp()
5404 {
5405 struct sadb_comb *comb;
5406 struct enc_xform *algo;
5407 struct mbuf *result = NULL, *m, *n;
5408 int encmin;
5409 int i, off, o;
5410 int totlen;
5411 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5412
5413 m = NULL;
5414 for (i = 1; i <= SADB_EALG_MAX; i++) {
5415 algo = esp_algorithm_lookup(i);
5416 if (algo == NULL)
5417 continue;
5418
5419 /* discard algorithms with key size smaller than system min */
5420 if (_BITS(algo->maxkey) < ipsec_esp_keymin)
5421 continue;
5422 if (_BITS(algo->minkey) < ipsec_esp_keymin)
5423 encmin = ipsec_esp_keymin;
5424 else
5425 encmin = _BITS(algo->minkey);
5426
5427 if (ipsec_esp_auth)
5428 m = key_getcomb_ah();
5429 else {
5430 IPSEC_ASSERT(l <= MLEN,
5431 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
5432 MGET(m, M_DONTWAIT, MT_DATA);
5433 if (m) {
5434 M_ALIGN(m, l);
5435 m->m_len = l;
5436 m->m_next = NULL;
5437 bzero(mtod(m, caddr_t), m->m_len);
5438 }
5439 }
5440 if (!m)
5441 goto fail;
5442
5443 totlen = 0;
5444 for (n = m; n; n = n->m_next)
5445 totlen += n->m_len;
5446 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l));
5447
5448 for (off = 0; off < totlen; off += l) {
5449 n = m_pulldown(m, off, l, &o);
5450 if (!n) {
5451 /* m is already freed */
5452 goto fail;
5453 }
5454 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
5455 bzero(comb, sizeof(*comb));
5456 key_getcomb_setlifetime(comb);
5457 comb->sadb_comb_encrypt = i;
5458 comb->sadb_comb_encrypt_minbits = encmin;
5459 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
5460 }
5461
5462 if (!result)
5463 result = m;
5464 else
5465 m_cat(result, m);
5466 }
5467
5468 return result;
5469
5470 fail:
5471 if (result)
5472 m_freem(result);
5473 return NULL;
5474 }
5475
5476 static void
5477 key_getsizes_ah(
5478 const struct auth_hash *ah,
5479 int alg,
5480 u_int16_t* min,
5481 u_int16_t* max)
5482 {
5483 *min = *max = ah->keysize;
5484 if (ah->keysize == 0) {
5485 /*
5486 * Transform takes arbitrary key size but algorithm
5487 * key size is restricted. Enforce this here.
5488 */
5489 switch (alg) {
5490 case SADB_X_AALG_MD5: *min = *max = 16; break;
5491 case SADB_X_AALG_SHA: *min = *max = 20; break;
5492 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
5493 default:
5494 DPRINTF(("%s: unknown AH algorithm %u\n",
5495 __func__, alg));
5496 break;
5497 }
5498 }
5499 }
5500
5501 /*
5502 * XXX reorder combinations by preference
5503 */
5504 static struct mbuf *
5505 key_getcomb_ah()
5506 {
5507 struct sadb_comb *comb;
5508 struct auth_hash *algo;
5509 struct mbuf *m;
5510 u_int16_t minkeysize, maxkeysize;
5511 int i;
5512 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5513
5514 m = NULL;
5515 for (i = 1; i <= SADB_AALG_MAX; i++) {
5516 #if 1
5517 /* we prefer HMAC algorithms, not old algorithms */
5518 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC)
5519 continue;
5520 #endif
5521 algo = ah_algorithm_lookup(i);
5522 if (!algo)
5523 continue;
5524 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
5525 /* discard algorithms with key size smaller than system min */
5526 if (_BITS(minkeysize) < ipsec_ah_keymin)
5527 continue;
5528
5529 if (!m) {
5530 IPSEC_ASSERT(l <= MLEN,
5531 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
5532 MGET(m, M_DONTWAIT, MT_DATA);
5533 if (m) {
5534 M_ALIGN(m, l);
5535 m->m_len = l;
5536 m->m_next = NULL;
5537 }
5538 } else
5539 M_PREPEND(m, l, M_DONTWAIT);
5540 if (!m)
5541 return NULL;
5542
5543 comb = mtod(m, struct sadb_comb *);
5544 bzero(comb, sizeof(*comb));
5545 key_getcomb_setlifetime(comb);
5546 comb->sadb_comb_auth = i;
5547 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
5548 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
5549 }
5550
5551 return m;
5552 }
5553
5554 /*
5555 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
5556 * XXX reorder combinations by preference
5557 */
5558 static struct mbuf *
5559 key_getcomb_ipcomp()
5560 {
5561 struct sadb_comb *comb;
5562 struct comp_algo *algo;
5563 struct mbuf *m;
5564 int i;
5565 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5566
5567 m = NULL;
5568 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
5569 algo = ipcomp_algorithm_lookup(i);
5570 if (!algo)
5571 continue;
5572
5573 if (!m) {
5574 IPSEC_ASSERT(l <= MLEN,
5575 ("l=%u > MLEN=%lu", l, (u_long) MLEN));
5576 MGET(m, M_DONTWAIT, MT_DATA);
5577 if (m) {
5578 M_ALIGN(m, l);
5579 m->m_len = l;
5580 m->m_next = NULL;
5581 }
5582 } else
5583 M_PREPEND(m, l, M_DONTWAIT);
5584 if (!m)
5585 return NULL;
5586
5587 comb = mtod(m, struct sadb_comb *);
5588 bzero(comb, sizeof(*comb));
5589 key_getcomb_setlifetime(comb);
5590 comb->sadb_comb_encrypt = i;
5591 /* what should we set into sadb_comb_*_{min,max}bits? */
5592 }
5593
5594 return m;
5595 }
5596
5597 /*
5598 * XXX no way to pass mode (transport/tunnel) to userland
5599 * XXX replay checking?
5600 * XXX sysctl interface to ipsec_{ah,esp}_keymin
5601 */
5602 static struct mbuf *
5603 key_getprop(saidx)
5604 const struct secasindex *saidx;
5605 {
5606 struct sadb_prop *prop;
5607 struct mbuf *m, *n;
5608 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
5609 int totlen;
5610
5611 switch (saidx->proto) {
5612 case IPPROTO_ESP:
5613 m = key_getcomb_esp();
5614 break;
5615 case IPPROTO_AH:
5616 m = key_getcomb_ah();
5617 break;
5618 case IPPROTO_IPCOMP:
5619 m = key_getcomb_ipcomp();
5620 break;
5621 default:
5622 return NULL;
5623 }
5624
5625 if (!m)
5626 return NULL;
5627 M_PREPEND(m, l, M_DONTWAIT);
5628 if (!m)
5629 return NULL;
5630
5631 totlen = 0;
5632 for (n = m; n; n = n->m_next)
5633 totlen += n->m_len;
5634
5635 prop = mtod(m, struct sadb_prop *);
5636 bzero(prop, sizeof(*prop));
5637 prop->sadb_prop_len = PFKEY_UNIT64(totlen);
5638 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
5639 prop->sadb_prop_replay = 32; /* XXX */
5640
5641 return m;
5642 }
5643
5644 /*
5645 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
5646 * send
5647 * <base, SA, address(SD), (address(P)), x_policy,
5648 * (identity(SD),) (sensitivity,) proposal>
5649 * to KMD, and expect to receive
5650 * <base> with SADB_ACQUIRE if error occured,
5651 * or
5652 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
5653 * from KMD by PF_KEY.
5654 *
5655 * XXX x_policy is outside of RFC2367 (KAME extension).
5656 * XXX sensitivity is not supported.
5657 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
5658 * see comment for key_getcomb_ipcomp().
5659 *
5660 * OUT:
5661 * 0 : succeed
5662 * others: error number
5663 */
5664 static int
5665 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
5666 {
5667 struct mbuf *result = NULL, *m;
5668 struct secacq *newacq;
5669 u_int8_t satype;
5670 int error = -1;
5671 u_int32_t seq;
5672
5673 IPSEC_ASSERT(saidx != NULL, ("null saidx"));
5674 satype = key_proto2satype(saidx->proto);
5675 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto));
5676
5677 /*
5678 * We never do anything about acquirng SA. There is anather
5679 * solution that kernel blocks to send SADB_ACQUIRE message until
5680 * getting something message from IKEd. In later case, to be
5681 * managed with ACQUIRING list.
5682 */
5683 /* Get an entry to check whether sending message or not. */
5684 if ((newacq = key_getacq(saidx)) != NULL) {
5685 if (key_blockacq_count < newacq->count) {
5686 /* reset counter and do send message. */
5687 newacq->count = 0;
5688 } else {
5689 /* increment counter and do nothing. */
5690 newacq->count++;
5691 return 0;
5692 }
5693 } else {
5694 /* make new entry for blocking to send SADB_ACQUIRE. */
5695 if ((newacq = key_newacq(saidx)) == NULL)
5696 return ENOBUFS;
5697 }
5698
5699
5700 seq = newacq->seq;
5701 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
5702 if (!m) {
5703 error = ENOBUFS;
5704 goto fail;
5705 }
5706 result = m;
5707
5708 /* set sadb_address for saidx's. */
5709 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
5710 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5711 if (!m) {
5712 error = ENOBUFS;
5713 goto fail;
5714 }
5715 m_cat(result, m);
5716
5717 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
5718 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5719 if (!m) {
5720 error = ENOBUFS;
5721 goto fail;
5722 }
5723 m_cat(result, m);
5724
5725 /* XXX proxy address (optional) */
5726
5727 /* set sadb_x_policy */
5728 if (sp) {
5729 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id);
5730 if (!m) {
5731 error = ENOBUFS;
5732 goto fail;
5733 }
5734 m_cat(result, m);
5735 }
5736
5737 /* XXX identity (optional) */
5738 #if 0
5739 if (idexttype && fqdn) {
5740 /* create identity extension (FQDN) */
5741 struct sadb_ident *id;
5742 int fqdnlen;
5743
5744 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
5745 id = (struct sadb_ident *)p;
5746 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5747 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5748 id->sadb_ident_exttype = idexttype;
5749 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
5750 bcopy(fqdn, id + 1, fqdnlen);
5751 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
5752 }
5753
5754 if (idexttype) {
5755 /* create identity extension (USERFQDN) */
5756 struct sadb_ident *id;
5757 int userfqdnlen;
5758
5759 if (userfqdn) {
5760 /* +1 for terminating-NUL */
5761 userfqdnlen = strlen(userfqdn) + 1;
5762 } else
5763 userfqdnlen = 0;
5764 id = (struct sadb_ident *)p;
5765 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5766 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5767 id->sadb_ident_exttype = idexttype;
5768 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
5769 /* XXX is it correct? */
5770 if (curproc && curproc->p_cred)
5771 id->sadb_ident_id = curproc->p_cred->p_ruid;
5772 if (userfqdn && userfqdnlen)
5773 bcopy(userfqdn, id + 1, userfqdnlen);
5774 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
5775 }
5776 #endif
5777
5778 /* XXX sensitivity (optional) */
5779
5780 /* create proposal/combination extension */
5781 m = key_getprop(saidx);
5782 #if 0
5783 /*
5784 * spec conformant: always attach proposal/combination extension,
5785 * the problem is that we have no way to attach it for ipcomp,
5786 * due to the way sadb_comb is declared in RFC2367.
5787 */
5788 if (!m) {
5789 error = ENOBUFS;
5790 goto fail;
5791 }
5792 m_cat(result, m);
5793 #else
5794 /*
5795 * outside of spec; make proposal/combination extension optional.
5796 */
5797 if (m)
5798 m_cat(result, m);
5799 #endif
5800
5801 if ((result->m_flags & M_PKTHDR) == 0) {
5802 error = EINVAL;
5803 goto fail;
5804 }
5805
5806 if (result->m_len < sizeof(struct sadb_msg)) {
5807 result = m_pullup(result, sizeof(struct sadb_msg));
5808 if (result == NULL) {
5809 error = ENOBUFS;
5810 goto fail;
5811 }
5812 }
5813
5814 result->m_pkthdr.len = 0;
5815 for (m = result; m; m = m->m_next)
5816 result->m_pkthdr.len += m->m_len;
5817
5818 mtod(result, struct sadb_msg *)->sadb_msg_len =
5819 PFKEY_UNIT64(result->m_pkthdr.len);
5820
5821 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
5822
5823 fail:
5824 if (result)
5825 m_freem(result);
5826 return error;
5827 }
5828
5829 static struct secacq *
5830 key_newacq(const struct secasindex *saidx)
5831 {
5832 struct secacq *newacq;
5833
5834 /* get new entry */
5835 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
5836 if (newacq == NULL) {
5837 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5838 return NULL;
5839 }
5840
5841 /* copy secindex */
5842 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
5843 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq);
5844 newacq->created = time_second;
5845 newacq->count = 0;
5846
5847 /* add to acqtree */
5848 ACQ_LOCK();
5849 LIST_INSERT_HEAD(&acqtree, newacq, chain);
5850 ACQ_UNLOCK();
5851
5852 return newacq;
5853 }
5854
5855 static struct secacq *
5856 key_getacq(const struct secasindex *saidx)
5857 {
5858 struct secacq *acq;
5859
5860 ACQ_LOCK();
5861 LIST_FOREACH(acq, &acqtree, chain) {
5862 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
5863 break;
5864 }
5865 ACQ_UNLOCK();
5866
5867 return acq;
5868 }
5869
5870 static struct secacq *
5871 key_getacqbyseq(seq)
5872 u_int32_t seq;
5873 {
5874 struct secacq *acq;
5875
5876 ACQ_LOCK();
5877 LIST_FOREACH(acq, &acqtree, chain) {
5878 if (acq->seq == seq)
5879 break;
5880 }
5881 ACQ_UNLOCK();
5882
5883 return acq;
5884 }
5885
5886 static struct secspacq *
5887 key_newspacq(spidx)
5888 struct secpolicyindex *spidx;
5889 {
5890 struct secspacq *acq;
5891
5892 /* get new entry */
5893 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO);
5894 if (acq == NULL) {
5895 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
5896 return NULL;
5897 }
5898
5899 /* copy secindex */
5900 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
5901 acq->created = time_second;
5902 acq->count = 0;
5903
5904 /* add to spacqtree */
5905 SPACQ_LOCK();
5906 LIST_INSERT_HEAD(&spacqtree, acq, chain);
5907 SPACQ_UNLOCK();
5908
5909 return acq;
5910 }
5911
5912 static struct secspacq *
5913 key_getspacq(spidx)
5914 struct secpolicyindex *spidx;
5915 {
5916 struct secspacq *acq;
5917
5918 SPACQ_LOCK();
5919 LIST_FOREACH(acq, &spacqtree, chain) {
5920 if (key_cmpspidx_exactly(spidx, &acq->spidx)) {
5921 /* NB: return holding spacq_lock */
5922 return acq;
5923 }
5924 }
5925 SPACQ_UNLOCK();
5926
5927 return NULL;
5928 }
5929
5930 /*
5931 * SADB_ACQUIRE processing,
5932 * in first situation, is receiving
5933 * <base>
5934 * from the ikmpd, and clear sequence of its secasvar entry.
5935 *
5936 * In second situation, is receiving
5937 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5938 * from a user land process, and return
5939 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5940 * to the socket.
5941 *
5942 * m will always be freed.
5943 */
5944 static int
5945 key_acquire2(so, m, mhp)
5946 struct socket *so;
5947 struct mbuf *m;
5948 const struct sadb_msghdr *mhp;
5949 {
5950 const struct sadb_address *src0, *dst0;
5951 struct secasindex saidx;
5952 struct secashead *sah;
5953 u_int16_t proto;
5954 int error;
5955
5956 IPSEC_ASSERT(so != NULL, ("null socket"));
5957 IPSEC_ASSERT(m != NULL, ("null mbuf"));
5958 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
5959 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
5960
5961 /*
5962 * Error message from KMd.
5963 * We assume that if error was occured in IKEd, the length of PFKEY
5964 * message is equal to the size of sadb_msg structure.
5965 * We do not raise error even if error occured in this function.
5966 */
5967 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
5968 struct secacq *acq;
5969
5970 /* check sequence number */
5971 if (mhp->msg->sadb_msg_seq == 0) {
5972 ipseclog((LOG_DEBUG, "%s: must specify sequence "
5973 "number.\n", __func__));
5974 m_freem(m);
5975 return 0;
5976 }
5977
5978 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
5979 /*
5980 * the specified larval SA is already gone, or we got
5981 * a bogus sequence number. we can silently ignore it.
5982 */
5983 m_freem(m);
5984 return 0;
5985 }
5986
5987 /* reset acq counter in order to deletion by timehander. */
5988 acq->created = time_second;
5989 acq->count = 0;
5990 m_freem(m);
5991 return 0;
5992 }
5993
5994 /*
5995 * This message is from user land.
5996 */
5997
5998 /* map satype to proto */
5999 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6000 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6001 __func__));
6002 return key_senderror(so, m, EINVAL);
6003 }
6004
6005 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
6006 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
6007 mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
6008 /* error */
6009 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
6010 __func__));
6011 return key_senderror(so, m, EINVAL);
6012 }
6013 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
6014 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
6015 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
6016 /* error */
6017 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n",
6018 __func__));
6019 return key_senderror(so, m, EINVAL);
6020 }
6021
6022 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
6023 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
6024
6025 /* XXX boundary check against sa_len */
6026 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
6027
6028 /* get a SA index */
6029 SAHTREE_LOCK();
6030 LIST_FOREACH(sah, &sahtree, chain) {
6031 if (sah->state == SADB_SASTATE_DEAD)
6032 continue;
6033 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
6034 break;
6035 }
6036 SAHTREE_UNLOCK();
6037 if (sah != NULL) {
6038 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__));
6039 return key_senderror(so, m, EEXIST);
6040 }
6041
6042 error = key_acquire(&saidx, NULL);
6043 if (error != 0) {
6044 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n",
6045 __func__, mhp->msg->sadb_msg_errno));
6046 return key_senderror(so, m, error);
6047 }
6048
6049 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
6050 }
6051
6052 /*
6053 * SADB_REGISTER processing.
6054 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
6055 * receive
6056 * <base>
6057 * from the ikmpd, and register a socket to send PF_KEY messages,
6058 * and send
6059 * <base, supported>
6060 * to KMD by PF_KEY.
6061 * If socket is detached, must free from regnode.
6062 *
6063 * m will always be freed.
6064 */
6065 static int
6066 key_register(so, m, mhp)
6067 struct socket *so;
6068 struct mbuf *m;
6069 const struct sadb_msghdr *mhp;
6070 {
6071 struct secreg *reg, *newreg = 0;
6072
6073 IPSEC_ASSERT(so != NULL, ("null socket"));
6074 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6075 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6076 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6077
6078 /* check for invalid register message */
6079 if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0]))
6080 return key_senderror(so, m, EINVAL);
6081
6082 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
6083 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
6084 goto setmsg;
6085
6086 /* check whether existing or not */
6087 REGTREE_LOCK();
6088 LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) {
6089 if (reg->so == so) {
6090 REGTREE_UNLOCK();
6091 ipseclog((LOG_DEBUG, "%s: socket exists already.\n",
6092 __func__));
6093 return key_senderror(so, m, EEXIST);
6094 }
6095 }
6096
6097 /* create regnode */
6098 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO);
6099 if (newreg == NULL) {
6100 REGTREE_UNLOCK();
6101 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6102 return key_senderror(so, m, ENOBUFS);
6103 }
6104
6105 newreg->so = so;
6106 ((struct keycb *)sotorawcb(so))->kp_registered++;
6107
6108 /* add regnode to regtree. */
6109 LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain);
6110 REGTREE_UNLOCK();
6111
6112 setmsg:
6113 {
6114 struct mbuf *n;
6115 struct sadb_msg *newmsg;
6116 struct sadb_supported *sup;
6117 u_int len, alen, elen;
6118 int off;
6119 int i;
6120 struct sadb_alg *alg;
6121
6122 /* create new sadb_msg to reply. */
6123 alen = 0;
6124 for (i = 1; i <= SADB_AALG_MAX; i++) {
6125 if (ah_algorithm_lookup(i))
6126 alen += sizeof(struct sadb_alg);
6127 }
6128 if (alen)
6129 alen += sizeof(struct sadb_supported);
6130 elen = 0;
6131 for (i = 1; i <= SADB_EALG_MAX; i++) {
6132 if (esp_algorithm_lookup(i))
6133 elen += sizeof(struct sadb_alg);
6134 }
6135 if (elen)
6136 elen += sizeof(struct sadb_supported);
6137
6138 len = sizeof(struct sadb_msg) + alen + elen;
6139
6140 if (len > MCLBYTES)
6141 return key_senderror(so, m, ENOBUFS);
6142
6143 MGETHDR(n, M_DONTWAIT, MT_DATA);
6144 if (len > MHLEN) {
6145 MCLGET(n, M_DONTWAIT);
6146 if ((n->m_flags & M_EXT) == 0) {
6147 m_freem(n);
6148 n = NULL;
6149 }
6150 }
6151 if (!n)
6152 return key_senderror(so, m, ENOBUFS);
6153
6154 n->m_pkthdr.len = n->m_len = len;
6155 n->m_next = NULL;
6156 off = 0;
6157
6158 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off);
6159 newmsg = mtod(n, struct sadb_msg *);
6160 newmsg->sadb_msg_errno = 0;
6161 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
6162 off += PFKEY_ALIGN8(sizeof(struct sadb_msg));
6163
6164 /* for authentication algorithm */
6165 if (alen) {
6166 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
6167 sup->sadb_supported_len = PFKEY_UNIT64(alen);
6168 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
6169 off += PFKEY_ALIGN8(sizeof(*sup));
6170
6171 for (i = 1; i <= SADB_AALG_MAX; i++) {
6172 struct auth_hash *aalgo;
6173 u_int16_t minkeysize, maxkeysize;
6174
6175 aalgo = ah_algorithm_lookup(i);
6176 if (!aalgo)
6177 continue;
6178 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
6179 alg->sadb_alg_id = i;
6180 alg->sadb_alg_ivlen = 0;
6181 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
6182 alg->sadb_alg_minbits = _BITS(minkeysize);
6183 alg->sadb_alg_maxbits = _BITS(maxkeysize);
6184 off += PFKEY_ALIGN8(sizeof(*alg));
6185 }
6186 }
6187
6188 /* for encryption algorithm */
6189 if (elen) {
6190 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
6191 sup->sadb_supported_len = PFKEY_UNIT64(elen);
6192 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
6193 off += PFKEY_ALIGN8(sizeof(*sup));
6194
6195 for (i = 1; i <= SADB_EALG_MAX; i++) {
6196 struct enc_xform *ealgo;
6197
6198 ealgo = esp_algorithm_lookup(i);
6199 if (!ealgo)
6200 continue;
6201 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
6202 alg->sadb_alg_id = i;
6203 alg->sadb_alg_ivlen = ealgo->blocksize;
6204 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
6205 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
6206 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
6207 }
6208 }
6209
6210 IPSEC_ASSERT(off == len,
6211 ("length assumption failed (off %u len %u)", off, len));
6212
6213 m_freem(m);
6214 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
6215 }
6216 }
6217
6218 /*
6219 * free secreg entry registered.
6220 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
6221 */
6222 void
6223 key_freereg(struct socket *so)
6224 {
6225 struct secreg *reg;
6226 int i;
6227
6228 IPSEC_ASSERT(so != NULL, ("NULL so"));
6229
6230 /*
6231 * check whether existing or not.
6232 * check all type of SA, because there is a potential that
6233 * one socket is registered to multiple type of SA.
6234 */
6235 REGTREE_LOCK();
6236 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
6237 LIST_FOREACH(reg, ®tree[i], chain) {
6238 if (reg->so == so && __LIST_CHAINED(reg)) {
6239 LIST_REMOVE(reg, chain);
6240 free(reg, M_IPSEC_SAR);
6241 break;
6242 }
6243 }
6244 }
6245 REGTREE_UNLOCK();
6246 }
6247
6248 /*
6249 * SADB_EXPIRE processing
6250 * send
6251 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
6252 * to KMD by PF_KEY.
6253 * NOTE: We send only soft lifetime extension.
6254 *
6255 * OUT: 0 : succeed
6256 * others : error number
6257 */
6258 static int
6259 key_expire(struct secasvar *sav)
6260 {
6261 int s;
6262 int satype;
6263 struct mbuf *result = NULL, *m;
6264 int len;
6265 int error = -1;
6266 struct sadb_lifetime *lt;
6267
6268 /* XXX: Why do we lock ? */
6269 s = splnet(); /*called from softclock()*/
6270
6271 IPSEC_ASSERT (sav != NULL, ("null sav"));
6272 IPSEC_ASSERT (sav->sah != NULL, ("null sa header"));
6273
6274 /* set msg header */
6275 satype = key_proto2satype(sav->sah->saidx.proto);
6276 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype));
6277 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
6278 if (!m) {
6279 error = ENOBUFS;
6280 goto fail;
6281 }
6282 result = m;
6283
6284 /* create SA extension */
6285 m = key_setsadbsa(sav);
6286 if (!m) {
6287 error = ENOBUFS;
6288 goto fail;
6289 }
6290 m_cat(result, m);
6291
6292 /* create SA extension */
6293 m = key_setsadbxsa2(sav->sah->saidx.mode,
6294 sav->replay ? sav->replay->count : 0,
6295 sav->sah->saidx.reqid);
6296 if (!m) {
6297 error = ENOBUFS;
6298 goto fail;
6299 }
6300 m_cat(result, m);
6301
6302 /* create lifetime extension (current and soft) */
6303 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
6304 m = key_alloc_mbuf(len);
6305 if (!m || m->m_next) { /*XXX*/
6306 if (m)
6307 m_freem(m);
6308 error = ENOBUFS;
6309 goto fail;
6310 }
6311 bzero(mtod(m, caddr_t), len);
6312 lt = mtod(m, struct sadb_lifetime *);
6313 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
6314 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
6315 lt->sadb_lifetime_allocations = sav->lft_c->allocations;
6316 lt->sadb_lifetime_bytes = sav->lft_c->bytes;
6317 lt->sadb_lifetime_addtime = sav->lft_c->addtime;
6318 lt->sadb_lifetime_usetime = sav->lft_c->usetime;
6319 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
6320 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
6321 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT;
6322 lt->sadb_lifetime_allocations = sav->lft_s->allocations;
6323 lt->sadb_lifetime_bytes = sav->lft_s->bytes;
6324 lt->sadb_lifetime_addtime = sav->lft_s->addtime;
6325 lt->sadb_lifetime_usetime = sav->lft_s->usetime;
6326 m_cat(result, m);
6327
6328 /* set sadb_address for source */
6329 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
6330 &sav->sah->saidx.src.sa,
6331 FULLMASK, IPSEC_ULPROTO_ANY);
6332 if (!m) {
6333 error = ENOBUFS;
6334 goto fail;
6335 }
6336 m_cat(result, m);
6337
6338 /* set sadb_address for destination */
6339 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
6340 &sav->sah->saidx.dst.sa,
6341 FULLMASK, IPSEC_ULPROTO_ANY);
6342 if (!m) {
6343 error = ENOBUFS;
6344 goto fail;
6345 }
6346 m_cat(result, m);
6347
6348 if ((result->m_flags & M_PKTHDR) == 0) {
6349 error = EINVAL;
6350 goto fail;
6351 }
6352
6353 if (result->m_len < sizeof(struct sadb_msg)) {
6354 result = m_pullup(result, sizeof(struct sadb_msg));
6355 if (result == NULL) {
6356 error = ENOBUFS;
6357 goto fail;
6358 }
6359 }
6360
6361 result->m_pkthdr.len = 0;
6362 for (m = result; m; m = m->m_next)
6363 result->m_pkthdr.len += m->m_len;
6364
6365 mtod(result, struct sadb_msg *)->sadb_msg_len =
6366 PFKEY_UNIT64(result->m_pkthdr.len);
6367
6368 splx(s);
6369 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6370
6371 fail:
6372 if (result)
6373 m_freem(result);
6374 splx(s);
6375 return error;
6376 }
6377
6378 /*
6379 * SADB_FLUSH processing
6380 * receive
6381 * <base>
6382 * from the ikmpd, and free all entries in secastree.
6383 * and send,
6384 * <base>
6385 * to the ikmpd.
6386 * NOTE: to do is only marking SADB_SASTATE_DEAD.
6387 *
6388 * m will always be freed.
6389 */
6390 static int
6391 key_flush(so, m, mhp)
6392 struct socket *so;
6393 struct mbuf *m;
6394 const struct sadb_msghdr *mhp;
6395 {
6396 struct sadb_msg *newmsg;
6397 struct secashead *sah, *nextsah;
6398 struct secasvar *sav, *nextsav;
6399 u_int16_t proto;
6400 u_int8_t state;
6401 u_int stateidx;
6402
6403 IPSEC_ASSERT(so != NULL, ("null socket"));
6404 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6405 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6406
6407 /* map satype to proto */
6408 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6409 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6410 __func__));
6411 return key_senderror(so, m, EINVAL);
6412 }
6413
6414 /* no SATYPE specified, i.e. flushing all SA. */
6415 SAHTREE_LOCK();
6416 for (sah = LIST_FIRST(&sahtree);
6417 sah != NULL;
6418 sah = nextsah) {
6419 nextsah = LIST_NEXT(sah, chain);
6420
6421 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6422 && proto != sah->saidx.proto)
6423 continue;
6424
6425 for (stateidx = 0;
6426 stateidx < _ARRAYLEN(saorder_state_alive);
6427 stateidx++) {
6428 state = saorder_state_any[stateidx];
6429 for (sav = LIST_FIRST(&sah->savtree[state]);
6430 sav != NULL;
6431 sav = nextsav) {
6432
6433 nextsav = LIST_NEXT(sav, chain);
6434
6435 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
6436 KEY_FREESAV(&sav);
6437 }
6438 }
6439
6440 sah->state = SADB_SASTATE_DEAD;
6441 }
6442 SAHTREE_UNLOCK();
6443
6444 if (m->m_len < sizeof(struct sadb_msg) ||
6445 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
6446 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
6447 return key_senderror(so, m, ENOBUFS);
6448 }
6449
6450 if (m->m_next)
6451 m_freem(m->m_next);
6452 m->m_next = NULL;
6453 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
6454 newmsg = mtod(m, struct sadb_msg *);
6455 newmsg->sadb_msg_errno = 0;
6456 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
6457
6458 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6459 }
6460
6461 /*
6462 * SADB_DUMP processing
6463 * dump all entries including status of DEAD in SAD.
6464 * receive
6465 * <base>
6466 * from the ikmpd, and dump all secasvar leaves
6467 * and send,
6468 * <base> .....
6469 * to the ikmpd.
6470 *
6471 * m will always be freed.
6472 */
6473 static int
6474 key_dump(so, m, mhp)
6475 struct socket *so;
6476 struct mbuf *m;
6477 const struct sadb_msghdr *mhp;
6478 {
6479 struct secashead *sah;
6480 struct secasvar *sav;
6481 u_int16_t proto;
6482 u_int stateidx;
6483 u_int8_t satype;
6484 u_int8_t state;
6485 int cnt;
6486 struct sadb_msg *newmsg;
6487 struct mbuf *n;
6488
6489 IPSEC_ASSERT(so != NULL, ("null socket"));
6490 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6491 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6492 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6493
6494 /* map satype to proto */
6495 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6496 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n",
6497 __func__));
6498 return key_senderror(so, m, EINVAL);
6499 }
6500
6501 /* count sav entries to be sent to the userland. */
6502 cnt = 0;
6503 SAHTREE_LOCK();
6504 LIST_FOREACH(sah, &sahtree, chain) {
6505 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6506 && proto != sah->saidx.proto)
6507 continue;
6508
6509 for (stateidx = 0;
6510 stateidx < _ARRAYLEN(saorder_state_any);
6511 stateidx++) {
6512 state = saorder_state_any[stateidx];
6513 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6514 cnt++;
6515 }
6516 }
6517 }
6518
6519 if (cnt == 0) {
6520 SAHTREE_UNLOCK();
6521 return key_senderror(so, m, ENOENT);
6522 }
6523
6524 /* send this to the userland, one at a time. */
6525 newmsg = NULL;
6526 LIST_FOREACH(sah, &sahtree, chain) {
6527 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6528 && proto != sah->saidx.proto)
6529 continue;
6530
6531 /* map proto to satype */
6532 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
6533 SAHTREE_UNLOCK();
6534 ipseclog((LOG_DEBUG, "%s: there was invalid proto in "
6535 "SAD.\n", __func__));
6536 return key_senderror(so, m, EINVAL);
6537 }
6538
6539 for (stateidx = 0;
6540 stateidx < _ARRAYLEN(saorder_state_any);
6541 stateidx++) {
6542 state = saorder_state_any[stateidx];
6543 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6544 n = key_setdumpsa(sav, SADB_DUMP, satype,
6545 --cnt, mhp->msg->sadb_msg_pid);
6546 if (!n) {
6547 SAHTREE_UNLOCK();
6548 return key_senderror(so, m, ENOBUFS);
6549 }
6550 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6551 }
6552 }
6553 }
6554 SAHTREE_UNLOCK();
6555
6556 m_freem(m);
6557 return 0;
6558 }
6559
6560 /*
6561 * SADB_X_PROMISC processing
6562 *
6563 * m will always be freed.
6564 */
6565 static int
6566 key_promisc(so, m, mhp)
6567 struct socket *so;
6568 struct mbuf *m;
6569 const struct sadb_msghdr *mhp;
6570 {
6571 int olen;
6572
6573 IPSEC_ASSERT(so != NULL, ("null socket"));
6574 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6575 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6576 IPSEC_ASSERT(mhp->msg != NULL, ("null msg"));
6577
6578 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6579
6580 if (olen < sizeof(struct sadb_msg)) {
6581 #if 1
6582 return key_senderror(so, m, EINVAL);
6583 #else
6584 m_freem(m);
6585 return 0;
6586 #endif
6587 } else if (olen == sizeof(struct sadb_msg)) {
6588 /* enable/disable promisc mode */
6589 struct keycb *kp;
6590
6591 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
6592 return key_senderror(so, m, EINVAL);
6593 mhp->msg->sadb_msg_errno = 0;
6594 switch (mhp->msg->sadb_msg_satype) {
6595 case 0:
6596 case 1:
6597 kp->kp_promisc = mhp->msg->sadb_msg_satype;
6598 break;
6599 default:
6600 return key_senderror(so, m, EINVAL);
6601 }
6602
6603 /* send the original message back to everyone */
6604 mhp->msg->sadb_msg_errno = 0;
6605 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6606 } else {
6607 /* send packet as is */
6608
6609 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
6610
6611 /* TODO: if sadb_msg_seq is specified, send to specific pid */
6612 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6613 }
6614 }
6615
6616 static int (*key_typesw[]) __P((struct socket *, struct mbuf *,
6617 const struct sadb_msghdr *)) = {
6618 NULL, /* SADB_RESERVED */
6619 key_getspi, /* SADB_GETSPI */
6620 key_update, /* SADB_UPDATE */
6621 key_add, /* SADB_ADD */
6622 key_delete, /* SADB_DELETE */
6623 key_get, /* SADB_GET */
6624 key_acquire2, /* SADB_ACQUIRE */
6625 key_register, /* SADB_REGISTER */
6626 NULL, /* SADB_EXPIRE */
6627 key_flush, /* SADB_FLUSH */
6628 key_dump, /* SADB_DUMP */
6629 key_promisc, /* SADB_X_PROMISC */
6630 NULL, /* SADB_X_PCHANGE */
6631 key_spdadd, /* SADB_X_SPDUPDATE */
6632 key_spdadd, /* SADB_X_SPDADD */
6633 key_spddelete, /* SADB_X_SPDDELETE */
6634 key_spdget, /* SADB_X_SPDGET */
6635 NULL, /* SADB_X_SPDACQUIRE */
6636 key_spddump, /* SADB_X_SPDDUMP */
6637 key_spdflush, /* SADB_X_SPDFLUSH */
6638 key_spdadd, /* SADB_X_SPDSETIDX */
6639 NULL, /* SADB_X_SPDEXPIRE */
6640 key_spddelete2, /* SADB_X_SPDDELETE2 */
6641 };
6642
6643 /*
6644 * parse sadb_msg buffer to process PFKEYv2,
6645 * and create a data to response if needed.
6646 * I think to be dealed with mbuf directly.
6647 * IN:
6648 * msgp : pointer to pointer to a received buffer pulluped.
6649 * This is rewrited to response.
6650 * so : pointer to socket.
6651 * OUT:
6652 * length for buffer to send to user process.
6653 */
6654 int
6655 key_parse(m, so)
6656 struct mbuf *m;
6657 struct socket *so;
6658 {
6659 struct sadb_msg *msg;
6660 struct sadb_msghdr mh;
6661 u_int orglen;
6662 int error;
6663 int target;
6664
6665 IPSEC_ASSERT(so != NULL, ("null socket"));
6666 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6667
6668 #if 0 /*kdebug_sadb assumes msg in linear buffer*/
6669 KEYDEBUG(KEYDEBUG_KEY_DUMP,
6670 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__));
6671 kdebug_sadb(msg));
6672 #endif
6673
6674 if (m->m_len < sizeof(struct sadb_msg)) {
6675 m = m_pullup(m, sizeof(struct sadb_msg));
6676 if (!m)
6677 return ENOBUFS;
6678 }
6679 msg = mtod(m, struct sadb_msg *);
6680 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
6681 target = KEY_SENDUP_ONE;
6682
6683 if ((m->m_flags & M_PKTHDR) == 0 ||
6684 m->m_pkthdr.len != m->m_pkthdr.len) {
6685 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__));
6686 pfkeystat.out_invlen++;
6687 error = EINVAL;
6688 goto senderror;
6689 }
6690
6691 if (msg->sadb_msg_version != PF_KEY_V2) {
6692 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n",
6693 __func__, msg->sadb_msg_version));
6694 pfkeystat.out_invver++;
6695 error = EINVAL;
6696 goto senderror;
6697 }
6698
6699 if (msg->sadb_msg_type > SADB_MAX) {
6700 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
6701 __func__, msg->sadb_msg_type));
6702 pfkeystat.out_invmsgtype++;
6703 error = EINVAL;
6704 goto senderror;
6705 }
6706
6707 /* for old-fashioned code - should be nuked */
6708 if (m->m_pkthdr.len > MCLBYTES) {
6709 m_freem(m);
6710 return ENOBUFS;
6711 }
6712 if (m->m_next) {
6713 struct mbuf *n;
6714
6715 MGETHDR(n, M_DONTWAIT, MT_DATA);
6716 if (n && m->m_pkthdr.len > MHLEN) {
6717 MCLGET(n, M_DONTWAIT);
6718 if ((n->m_flags & M_EXT) == 0) {
6719 m_free(n);
6720 n = NULL;
6721 }
6722 }
6723 if (!n) {
6724 m_freem(m);
6725 return ENOBUFS;
6726 }
6727 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
6728 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
6729 n->m_next = NULL;
6730 m_freem(m);
6731 m = n;
6732 }
6733
6734 /* align the mbuf chain so that extensions are in contiguous region. */
6735 error = key_align(m, &mh);
6736 if (error)
6737 return error;
6738
6739 msg = mh.msg;
6740
6741 /* check SA type */
6742 switch (msg->sadb_msg_satype) {
6743 case SADB_SATYPE_UNSPEC:
6744 switch (msg->sadb_msg_type) {
6745 case SADB_GETSPI:
6746 case SADB_UPDATE:
6747 case SADB_ADD:
6748 case SADB_DELETE:
6749 case SADB_GET:
6750 case SADB_ACQUIRE:
6751 case SADB_EXPIRE:
6752 ipseclog((LOG_DEBUG, "%s: must specify satype "
6753 "when msg type=%u.\n", __func__,
6754 msg->sadb_msg_type));
6755 pfkeystat.out_invsatype++;
6756 error = EINVAL;
6757 goto senderror;
6758 }
6759 break;
6760 case SADB_SATYPE_AH:
6761 case SADB_SATYPE_ESP:
6762 case SADB_X_SATYPE_IPCOMP:
6763 case SADB_X_SATYPE_TCPSIGNATURE:
6764 switch (msg->sadb_msg_type) {
6765 case SADB_X_SPDADD:
6766 case SADB_X_SPDDELETE:
6767 case SADB_X_SPDGET:
6768 case SADB_X_SPDDUMP:
6769 case SADB_X_SPDFLUSH:
6770 case SADB_X_SPDSETIDX:
6771 case SADB_X_SPDUPDATE:
6772 case SADB_X_SPDDELETE2:
6773 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n",
6774 __func__, msg->sadb_msg_type));
6775 pfkeystat.out_invsatype++;
6776 error = EINVAL;
6777 goto senderror;
6778 }
6779 break;
6780 case SADB_SATYPE_RSVP:
6781 case SADB_SATYPE_OSPFV2:
6782 case SADB_SATYPE_RIPV2:
6783 case SADB_SATYPE_MIP:
6784 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n",
6785 __func__, msg->sadb_msg_satype));
6786 pfkeystat.out_invsatype++;
6787 error = EOPNOTSUPP;
6788 goto senderror;
6789 case 1: /* XXX: What does it do? */
6790 if (msg->sadb_msg_type == SADB_X_PROMISC)
6791 break;
6792 /*FALLTHROUGH*/
6793 default:
6794 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n",
6795 __func__, msg->sadb_msg_satype));
6796 pfkeystat.out_invsatype++;
6797 error = EINVAL;
6798 goto senderror;
6799 }
6800
6801 /* check field of upper layer protocol and address family */
6802 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
6803 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
6804 struct sadb_address *src0, *dst0;
6805 u_int plen;
6806
6807 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
6808 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
6809
6810 /* check upper layer protocol */
6811 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
6812 ipseclog((LOG_DEBUG, "%s: upper layer protocol "
6813 "mismatched.\n", __func__));
6814 pfkeystat.out_invaddr++;
6815 error = EINVAL;
6816 goto senderror;
6817 }
6818
6819 /* check family */
6820 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
6821 PFKEY_ADDR_SADDR(dst0)->sa_family) {
6822 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n",
6823 __func__));
6824 pfkeystat.out_invaddr++;
6825 error = EINVAL;
6826 goto senderror;
6827 }
6828 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6829 PFKEY_ADDR_SADDR(dst0)->sa_len) {
6830 ipseclog((LOG_DEBUG, "%s: address struct size "
6831 "mismatched.\n", __func__));
6832 pfkeystat.out_invaddr++;
6833 error = EINVAL;
6834 goto senderror;
6835 }
6836
6837 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6838 case AF_INET:
6839 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6840 sizeof(struct sockaddr_in)) {
6841 pfkeystat.out_invaddr++;
6842 error = EINVAL;
6843 goto senderror;
6844 }
6845 break;
6846 case AF_INET6:
6847 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6848 sizeof(struct sockaddr_in6)) {
6849 pfkeystat.out_invaddr++;
6850 error = EINVAL;
6851 goto senderror;
6852 }
6853 break;
6854 default:
6855 ipseclog((LOG_DEBUG, "%s: unsupported address family\n",
6856 __func__));
6857 pfkeystat.out_invaddr++;
6858 error = EAFNOSUPPORT;
6859 goto senderror;
6860 }
6861
6862 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6863 case AF_INET:
6864 plen = sizeof(struct in_addr) << 3;
6865 break;
6866 case AF_INET6:
6867 plen = sizeof(struct in6_addr) << 3;
6868 break;
6869 default:
6870 plen = 0; /*fool gcc*/
6871 break;
6872 }
6873
6874 /* check max prefix length */
6875 if (src0->sadb_address_prefixlen > plen ||
6876 dst0->sadb_address_prefixlen > plen) {
6877 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n",
6878 __func__));
6879 pfkeystat.out_invaddr++;
6880 error = EINVAL;
6881 goto senderror;
6882 }
6883
6884 /*
6885 * prefixlen == 0 is valid because there can be a case when
6886 * all addresses are matched.
6887 */
6888 }
6889
6890 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
6891 key_typesw[msg->sadb_msg_type] == NULL) {
6892 pfkeystat.out_invmsgtype++;
6893 error = EINVAL;
6894 goto senderror;
6895 }
6896
6897 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
6898
6899 senderror:
6900 msg->sadb_msg_errno = error;
6901 return key_sendup_mbuf(so, m, target);
6902 }
6903
6904 static int
6905 key_senderror(so, m, code)
6906 struct socket *so;
6907 struct mbuf *m;
6908 int code;
6909 {
6910 struct sadb_msg *msg;
6911
6912 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
6913 ("mbuf too small, len %u", m->m_len));
6914
6915 msg = mtod(m, struct sadb_msg *);
6916 msg->sadb_msg_errno = code;
6917 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
6918 }
6919
6920 /*
6921 * set the pointer to each header into message buffer.
6922 * m will be freed on error.
6923 * XXX larger-than-MCLBYTES extension?
6924 */
6925 static int
6926 key_align(m, mhp)
6927 struct mbuf *m;
6928 struct sadb_msghdr *mhp;
6929 {
6930 struct mbuf *n;
6931 struct sadb_ext *ext;
6932 size_t off, end;
6933 int extlen;
6934 int toff;
6935
6936 IPSEC_ASSERT(m != NULL, ("null mbuf"));
6937 IPSEC_ASSERT(mhp != NULL, ("null msghdr"));
6938 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg),
6939 ("mbuf too small, len %u", m->m_len));
6940
6941 /* initialize */
6942 bzero(mhp, sizeof(*mhp));
6943
6944 mhp->msg = mtod(m, struct sadb_msg *);
6945 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
6946
6947 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6948 extlen = end; /*just in case extlen is not updated*/
6949 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
6950 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
6951 if (!n) {
6952 /* m is already freed */
6953 return ENOBUFS;
6954 }
6955 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6956
6957 /* set pointer */
6958 switch (ext->sadb_ext_type) {
6959 case SADB_EXT_SA:
6960 case SADB_EXT_ADDRESS_SRC:
6961 case SADB_EXT_ADDRESS_DST:
6962 case SADB_EXT_ADDRESS_PROXY:
6963 case SADB_EXT_LIFETIME_CURRENT:
6964 case SADB_EXT_LIFETIME_HARD:
6965 case SADB_EXT_LIFETIME_SOFT:
6966 case SADB_EXT_KEY_AUTH:
6967 case SADB_EXT_KEY_ENCRYPT:
6968 case SADB_EXT_IDENTITY_SRC:
6969 case SADB_EXT_IDENTITY_DST:
6970 case SADB_EXT_SENSITIVITY:
6971 case SADB_EXT_PROPOSAL:
6972 case SADB_EXT_SUPPORTED_AUTH:
6973 case SADB_EXT_SUPPORTED_ENCRYPT:
6974 case SADB_EXT_SPIRANGE:
6975 case SADB_X_EXT_POLICY:
6976 case SADB_X_EXT_SA2:
6977 /* duplicate check */
6978 /*
6979 * XXX Are there duplication payloads of either
6980 * KEY_AUTH or KEY_ENCRYPT ?
6981 */
6982 if (mhp->ext[ext->sadb_ext_type] != NULL) {
6983 ipseclog((LOG_DEBUG, "%s: duplicate ext_type "
6984 "%u\n", __func__, ext->sadb_ext_type));
6985 m_freem(m);
6986 pfkeystat.out_dupext++;
6987 return EINVAL;
6988 }
6989 break;
6990 default:
6991 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n",
6992 __func__, ext->sadb_ext_type));
6993 m_freem(m);
6994 pfkeystat.out_invexttype++;
6995 return EINVAL;
6996 }
6997
6998 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
6999
7000 if (key_validate_ext(ext, extlen)) {
7001 m_freem(m);
7002 pfkeystat.out_invlen++;
7003 return EINVAL;
7004 }
7005
7006 n = m_pulldown(m, off, extlen, &toff);
7007 if (!n) {
7008 /* m is already freed */
7009 return ENOBUFS;
7010 }
7011 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
7012
7013 mhp->ext[ext->sadb_ext_type] = ext;
7014 mhp->extoff[ext->sadb_ext_type] = off;
7015 mhp->extlen[ext->sadb_ext_type] = extlen;
7016 }
7017
7018 if (off != end) {
7019 m_freem(m);
7020 pfkeystat.out_invlen++;
7021 return EINVAL;
7022 }
7023
7024 return 0;
7025 }
7026
7027 static int
7028 key_validate_ext(ext, len)
7029 const struct sadb_ext *ext;
7030 int len;
7031 {
7032 const struct sockaddr *sa;
7033 enum { NONE, ADDR } checktype = NONE;
7034 int baselen = 0;
7035 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
7036
7037 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
7038 return EINVAL;
7039
7040 /* if it does not match minimum/maximum length, bail */
7041 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
7042 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
7043 return EINVAL;
7044 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
7045 return EINVAL;
7046 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
7047 return EINVAL;
7048
7049 /* more checks based on sadb_ext_type XXX need more */
7050 switch (ext->sadb_ext_type) {
7051 case SADB_EXT_ADDRESS_SRC:
7052 case SADB_EXT_ADDRESS_DST:
7053 case SADB_EXT_ADDRESS_PROXY:
7054 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
7055 checktype = ADDR;
7056 break;
7057 case SADB_EXT_IDENTITY_SRC:
7058 case SADB_EXT_IDENTITY_DST:
7059 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
7060 SADB_X_IDENTTYPE_ADDR) {
7061 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
7062 checktype = ADDR;
7063 } else
7064 checktype = NONE;
7065 break;
7066 default:
7067 checktype = NONE;
7068 break;
7069 }
7070
7071 switch (checktype) {
7072 case NONE:
7073 break;
7074 case ADDR:
7075 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
7076 if (len < baselen + sal)
7077 return EINVAL;
7078 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
7079 return EINVAL;
7080 break;
7081 }
7082
7083 return 0;
7084 }
7085
7086 void
7087 key_init()
7088 {
7089 int i;
7090
7091 SPTREE_LOCK_INIT();
7092 REGTREE_LOCK_INIT();
7093 SAHTREE_LOCK_INIT();
7094 ACQ_LOCK_INIT();
7095 SPACQ_LOCK_INIT();
7096
7097 for (i = 0; i < IPSEC_DIR_MAX; i++)
7098 LIST_INIT(&sptree[i]);
7099
7100 LIST_INIT(&sahtree);
7101
7102 for (i = 0; i <= SADB_SATYPE_MAX; i++)
7103 LIST_INIT(®tree[i]);
7104
7105 LIST_INIT(&acqtree);
7106 LIST_INIT(&spacqtree);
7107
7108 /* system default */
7109 ip4_def_policy.policy = IPSEC_POLICY_NONE;
7110 ip4_def_policy.refcnt++; /*never reclaim this*/
7111
7112 #ifndef IPSEC_DEBUG2
7113 timeout((void *)key_timehandler, (void *)0, hz);
7114 #endif /*IPSEC_DEBUG2*/
7115
7116 /* initialize key statistics */
7117 keystat.getspi_count = 1;
7118
7119 printf("IPsec: Initialized Security Association Processing.\n");
7120
7121 return;
7122 }
7123
7124 /*
7125 * XXX: maybe This function is called after INBOUND IPsec processing.
7126 *
7127 * Special check for tunnel-mode packets.
7128 * We must make some checks for consistency between inner and outer IP header.
7129 *
7130 * xxx more checks to be provided
7131 */
7132 int
7133 key_checktunnelsanity(sav, family, src, dst)
7134 struct secasvar *sav;
7135 u_int family;
7136 caddr_t src;
7137 caddr_t dst;
7138 {
7139 IPSEC_ASSERT(sav->sah != NULL, ("null SA header"));
7140
7141 /* XXX: check inner IP header */
7142
7143 return 1;
7144 }
7145
7146 /* record data transfer on SA, and update timestamps */
7147 void
7148 key_sa_recordxfer(sav, m)
7149 struct secasvar *sav;
7150 struct mbuf *m;
7151 {
7152 IPSEC_ASSERT(sav != NULL, ("Null secasvar"));
7153 IPSEC_ASSERT(m != NULL, ("Null mbuf"));
7154 if (!sav->lft_c)
7155 return;
7156
7157 /*
7158 * XXX Currently, there is a difference of bytes size
7159 * between inbound and outbound processing.
7160 */
7161 sav->lft_c->bytes += m->m_pkthdr.len;
7162 /* to check bytes lifetime is done in key_timehandler(). */
7163
7164 /*
7165 * We use the number of packets as the unit of
7166 * allocations. We increment the variable
7167 * whenever {esp,ah}_{in,out}put is called.
7168 */
7169 sav->lft_c->allocations++;
7170 /* XXX check for expires? */
7171
7172 /*
7173 * NOTE: We record CURRENT usetime by using wall clock,
7174 * in seconds. HARD and SOFT lifetime are measured by the time
7175 * difference (again in seconds) from usetime.
7176 *
7177 * usetime
7178 * v expire expire
7179 * -----+-----+--------+---> t
7180 * <--------------> HARD
7181 * <-----> SOFT
7182 */
7183 sav->lft_c->usetime = time_second;
7184 /* XXX check for expires? */
7185
7186 return;
7187 }
7188
7189 /* dumb version */
7190 void
7191 key_sa_routechange(dst)
7192 struct sockaddr *dst;
7193 {
7194 struct secashead *sah;
7195 struct route *ro;
7196
7197 SAHTREE_LOCK();
7198 LIST_FOREACH(sah, &sahtree, chain) {
7199 ro = &sah->route_cache.sa_route;
7200 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len
7201 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
7202 RTFREE(ro->ro_rt);
7203 ro->ro_rt = (struct rtentry *)NULL;
7204 }
7205 }
7206 SAHTREE_UNLOCK();
7207 }
7208
7209 static void
7210 key_sa_chgstate(struct secasvar *sav, u_int8_t state)
7211 {
7212 IPSEC_ASSERT(sav != NULL, ("NULL sav"));
7213 SAHTREE_LOCK_ASSERT();
7214
7215 if (sav->state != state) {
7216 if (__LIST_CHAINED(sav))
7217 LIST_REMOVE(sav, chain);
7218 sav->state = state;
7219 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
7220 }
7221 }
7222
7223 void
7224 key_sa_stir_iv(sav)
7225 struct secasvar *sav;
7226 {
7227
7228 IPSEC_ASSERT(sav->iv != NULL, ("null IV"));
7229 key_randomfill(sav->iv, sav->ivlen);
7230 }
7231
7232 /* XXX too much? */
7233 static struct mbuf *
7234 key_alloc_mbuf(l)
7235 int l;
7236 {
7237 struct mbuf *m = NULL, *n;
7238 int len, t;
7239
7240 len = l;
7241 while (len > 0) {
7242 MGET(n, M_DONTWAIT, MT_DATA);
7243 if (n && len > MLEN)
7244 MCLGET(n, M_DONTWAIT);
7245 if (!n) {
7246 m_freem(m);
7247 return NULL;
7248 }
7249
7250 n->m_next = NULL;
7251 n->m_len = 0;
7252 n->m_len = M_TRAILINGSPACE(n);
7253 /* use the bottom of mbuf, hoping we can prepend afterwards */
7254 if (n->m_len > len) {
7255 t = (n->m_len - len) & ~(sizeof(long) - 1);
7256 n->m_data += t;
7257 n->m_len = len;
7258 }
7259
7260 len -= n->m_len;
7261
7262 if (m)
7263 m_cat(m, n);
7264 else
7265 m = n;
7266 }
7267
7268 return m;
7269 }
7270
7271 /*
7272 * Take one of the kernel's security keys and convert it into a PF_KEY
7273 * structure within an mbuf, suitable for sending up to a waiting
7274 * application in user land.
7275 *
7276 * IN:
7277 * src: A pointer to a kernel security key.
7278 * exttype: Which type of key this is. Refer to the PF_KEY data structures.
7279 * OUT:
7280 * a valid mbuf or NULL indicating an error
7281 *
7282 */
7283
7284 static struct mbuf *
7285 key_setkey(struct seckey *src, u_int16_t exttype)
7286 {
7287 struct mbuf *m;
7288 struct sadb_key *p;
7289 int len;
7290
7291 if (src == NULL)
7292 return NULL;
7293
7294 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src));
7295 m = key_alloc_mbuf(len);
7296 if (m == NULL)
7297 return NULL;
7298 p = mtod(m, struct sadb_key *);
7299 bzero(p, len);
7300 p->sadb_key_len = PFKEY_UNIT64(len);
7301 p->sadb_key_exttype = exttype;
7302 p->sadb_key_bits = src->bits;
7303 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src));
7304
7305 return m;
7306 }
7307
7308 /*
7309 * Take one of the kernel's lifetime data structures and convert it
7310 * into a PF_KEY structure within an mbuf, suitable for sending up to
7311 * a waiting application in user land.
7312 *
7313 * IN:
7314 * src: A pointer to a kernel lifetime structure.
7315 * exttype: Which type of lifetime this is. Refer to the PF_KEY
7316 * data structures for more information.
7317 * OUT:
7318 * a valid mbuf or NULL indicating an error
7319 *
7320 */
7321
7322 static struct mbuf *
7323 key_setlifetime(struct seclifetime *src, u_int16_t exttype)
7324 {
7325 struct mbuf *m = NULL;
7326 struct sadb_lifetime *p;
7327 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime));
7328
7329 if (src == NULL)
7330 return NULL;
7331
7332 m = key_alloc_mbuf(len);
7333 if (m == NULL)
7334 return m;
7335 p = mtod(m, struct sadb_lifetime *);
7336
7337 bzero(p, len);
7338 p->sadb_lifetime_len = PFKEY_UNIT64(len);
7339 p->sadb_lifetime_exttype = exttype;
7340 p->sadb_lifetime_allocations = src->allocations;
7341 p->sadb_lifetime_bytes = src->bytes;
7342 p->sadb_lifetime_addtime = src->addtime;
7343 p->sadb_lifetime_usetime = src->usetime;
7344
7345 return m;
7346
7347 }
Cache object: 8e20ecb72ef6fb9917d73529b061b56a
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