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[dragonfly.git] / sys / netproto / ipsec / key.c
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1 /* $FreeBSD: src/sys/netipsec/key.c,v 1.3.2.1 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netproto/ipsec/key.c,v 1.26 2008/06/08 08:38:05 sephe Exp $ */
3 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * This code is referd to RFC 2367
36 */
37
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_ipsec.h"
41
42 #include <sys/types.h>
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/mbuf.h>
47 #include <sys/domain.h>
48 #include <sys/protosw.h>
49 #include <sys/malloc.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/sysctl.h>
53 #include <sys/errno.h>
54 #include <sys/proc.h>
55 #include <sys/queue.h>
56 #include <sys/syslog.h>
57
58 #include <net/if.h>
59 #include <net/route.h>
60 #include <net/raw_cb.h>
61
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/ip.h>
65 #include <netinet/in_var.h>
66
67 #ifdef INET6
68 #include <netinet/ip6.h>
69 #include <netinet6/in6_var.h>
70 #include <netinet6/ip6_var.h>
71 #endif /* INET6 */
72
73 #ifdef INET
74 #include <netinet/in_pcb.h>
75 #endif
76 #ifdef INET6
77 #include <netinet6/in6_pcb.h>
78 #endif /* INET6 */
79
80 #include <net/pfkeyv2.h>
81 #include <netproto/ipsec/keydb.h>
82 #include <netproto/ipsec/key.h>
83 #include <netproto/ipsec/keysock.h>
84 #include <netproto/ipsec/key_debug.h>
85
86 #include <netproto/ipsec/ipsec.h>
87 #ifdef INET6
88 #include <netproto/ipsec/ipsec6.h>
89 #endif
90
91 #include <netproto/ipsec/xform.h>
92
93 #include <machine/stdarg.h>
94
95 /* randomness */
96 #include <sys/random.h>
97
98 #include <net/net_osdep.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 #ifndef IPSEC_DEBUG2
115 static struct callout key_timehandler_ch;
116 #endif
117 u_int32_t key_debug_level = 0;
118 static u_int key_spi_trycnt = 1000;
119 static u_int32_t key_spi_minval = 0x100;
120 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */
121 static u_int32_t policy_id = 0;
122 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/
123 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/
124 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/
125 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/
126 static int key_prefered_oldsa = 1; /* prefered old sa rather than new sa.*/
127
128 static u_int32_t acq_seq = 0;
129 static int key_tick_init_random = 0;
130
131 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */
132 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */
133 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
134 /* registed list */
135 #ifndef IPSEC_NONBLOCK_ACQUIRE
136 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */
137 #endif
138 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */
139
140 /* search order for SAs */
141 static u_int saorder_state_valid[] = {
142 SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
143 /*
144 * This order is important because we must select the oldest SA
145 * for outbound processing. For inbound, This is not important.
146 */
147 };
148 static u_int saorder_state_alive[] = {
149 /* except DEAD */
150 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
151 };
152 static u_int saorder_state_any[] = {
153 SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
154 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
155 };
156
157 static const int minsize[] = {
158 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
159 sizeof(struct sadb_sa), /* SADB_EXT_SA */
160 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
161 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
162 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
163 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
164 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
165 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
166 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
167 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
168 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
169 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
170 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
171 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
172 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
173 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
174 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
175 0, /* SADB_X_EXT_KMPRIVATE */
176 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
177 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
178 };
179 static const int maxsize[] = {
180 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
181 sizeof(struct sadb_sa), /* SADB_EXT_SA */
182 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
183 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
184 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
185 0, /* SADB_EXT_ADDRESS_SRC */
186 0, /* SADB_EXT_ADDRESS_DST */
187 0, /* SADB_EXT_ADDRESS_PROXY */
188 0, /* SADB_EXT_KEY_AUTH */
189 0, /* SADB_EXT_KEY_ENCRYPT */
190 0, /* SADB_EXT_IDENTITY_SRC */
191 0, /* SADB_EXT_IDENTITY_DST */
192 0, /* SADB_EXT_SENSITIVITY */
193 0, /* SADB_EXT_PROPOSAL */
194 0, /* SADB_EXT_SUPPORTED_AUTH */
195 0, /* SADB_EXT_SUPPORTED_ENCRYPT */
196 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
197 0, /* SADB_X_EXT_KMPRIVATE */
198 0, /* SADB_X_EXT_POLICY */
199 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
200 };
201
202 static int ipsec_esp_keymin = 256;
203 static int ipsec_esp_auth = 0;
204 static int ipsec_ah_keymin = 128;
205
206 #ifdef SYSCTL_DECL
207 SYSCTL_DECL(_net_key);
208 #endif
209
210 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \
211 &key_debug_level, 0, "");
212
213 /* max count of trial for the decision of spi value */
214 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \
215 &key_spi_trycnt, 0, "");
216
217 /* minimum spi value to allocate automatically. */
218 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \
219 &key_spi_minval, 0, "");
220
221 /* maximun spi value to allocate automatically. */
222 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \
223 &key_spi_maxval, 0, "");
224
225 /* interval to initialize randseed */
226 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \
227 &key_int_random, 0, "");
228
229 /* lifetime for larval SA */
230 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \
231 &key_larval_lifetime, 0, "");
232
233 /* counter for blocking to send SADB_ACQUIRE to IKEd */
234 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \
235 &key_blockacq_count, 0, "");
236
237 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
238 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \
239 &key_blockacq_lifetime, 0, "");
240
241 /* ESP auth */
242 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \
243 &ipsec_esp_auth, 0, "");
244
245 /* minimum ESP key length */
246 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \
247 &ipsec_esp_keymin, 0, "");
248
249 /* minimum AH key length */
250 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \
251 &ipsec_ah_keymin, 0, "");
252
253 /* perfered old SA rather than new SA */
254 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, prefered_oldsa, CTLFLAG_RW,\
255 &key_prefered_oldsa, 0, "");
256
257 #define __LIST_CHAINED(elm) \
258 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
259 #define LIST_INSERT_TAIL(head, elm, type, field) \
260 do {\
261 struct type *curelm = LIST_FIRST(head); \
262 if (curelm == NULL) {\
263 LIST_INSERT_HEAD(head, elm, field); \
264 } else { \
265 while (LIST_NEXT(curelm, field)) \
266 curelm = LIST_NEXT(curelm, field);\
267 LIST_INSERT_AFTER(curelm, elm, field);\
268 }\
269 } while (0)
270
271 #define KEY_CHKSASTATE(head, sav, name) \
272 do { \
273 if ((head) != (sav)) { \
274 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \
275 (name), (head), (sav))); \
276 continue; \
277 } \
278 } while (0)
279
280 #define KEY_CHKSPDIR(head, sp, name) \
281 do { \
282 if ((head) != (sp)) { \
283 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \
284 "anyway continue.\n", \
285 (name), (head), (sp))); \
286 } \
287 } while (0)
288
289 MALLOC_DEFINE(M_SECA, "key mgmt", "security associations, key management");
290
291 #if 1
292 #define KMALLOC(p, t, n) \
293 ((p) = (t) kmalloc((unsigned long)(n), M_SECA, M_INTWAIT | M_NULLOK))
294 #define KFREE(p) \
295 kfree((caddr_t)(p), M_SECA)
296 #else
297 #define KMALLOC(p, t, n) \
298 do { \
299 ((p) = (t)kmalloc((unsigned long)(n), M_SECA, M_INTWAIT | M_NULLOK)); \
300 kprintf("%s %d: %p <- KMALLOC(%s, %d)\n", \
301 __FILE__, __LINE__, (p), #t, n); \
302 } while (0)
303
304 #define KFREE(p) \
305 do { \
306 kprintf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \
307 kfree((caddr_t)(p), M_SECA); \
308 } while (0)
309 #endif
310
311 /*
312 * set parameters into secpolicyindex buffer.
313 * Must allocate secpolicyindex buffer passed to this function.
314 */
315 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
316 do { \
317 bzero((idx), sizeof(struct secpolicyindex)); \
318 (idx)->dir = (_dir); \
319 (idx)->prefs = (ps); \
320 (idx)->prefd = (pd); \
321 (idx)->ul_proto = (ulp); \
322 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
323 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
324 } while (0)
325
326 /*
327 * set parameters into secasindex buffer.
328 * Must allocate secasindex buffer before calling this function.
329 */
330 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
331 do { \
332 bzero((idx), sizeof(struct secasindex)); \
333 (idx)->proto = (p); \
334 (idx)->mode = (m); \
335 (idx)->reqid = (r); \
336 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
337 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
338 } while (0)
339
340 /* key statistics */
341 struct _keystat {
342 u_long getspi_count; /* the avarage of count to try to get new SPI */
343 } keystat;
344
345 struct sadb_msghdr {
346 struct sadb_msg *msg;
347 struct sadb_ext *ext[SADB_EXT_MAX + 1];
348 int extoff[SADB_EXT_MAX + 1];
349 int extlen[SADB_EXT_MAX + 1];
350 };
351
352 static struct secasvar *key_allocsa_policy (const struct secasindex *);
353 static void key_freesp_so (struct secpolicy **);
354 static struct secasvar *key_do_allocsa_policy (struct secashead *, u_int);
355 static void key_delsp (struct secpolicy *);
356 static struct secpolicy *key_getsp (struct secpolicyindex *);
357 static struct secpolicy *key_getspbyid (u_int32_t);
358 static u_int32_t key_newreqid (void);
359 static struct mbuf *key_gather_mbuf (struct mbuf *,
360 const struct sadb_msghdr *, int, int, ...);
361 static int key_spdadd (struct socket *, struct mbuf *,
362 const struct sadb_msghdr *);
363 static u_int32_t key_getnewspid (void);
364 static int key_spddelete (struct socket *, struct mbuf *,
365 const struct sadb_msghdr *);
366 static int key_spddelete2 (struct socket *, struct mbuf *,
367 const struct sadb_msghdr *);
368 static int key_spdget (struct socket *, struct mbuf *,
369 const struct sadb_msghdr *);
370 static int key_spdflush (struct socket *, struct mbuf *,
371 const struct sadb_msghdr *);
372 static int key_spddump (struct socket *, struct mbuf *,
373 const struct sadb_msghdr *);
374 static struct mbuf *key_setdumpsp (struct secpolicy *,
375 u_int8_t, u_int32_t, u_int32_t);
376 static u_int key_getspreqmsglen (struct secpolicy *);
377 static int key_spdexpire (struct secpolicy *);
378 static struct secashead *key_newsah (struct secasindex *);
379 static void key_delsah (struct secashead *);
380 static struct secasvar *key_newsav (struct mbuf *,
381 const struct sadb_msghdr *, struct secashead *, int *,
382 const char*, int);
383 #define KEY_NEWSAV(m, sadb, sah, e) \
384 key_newsav(m, sadb, sah, e, __FILE__, __LINE__)
385 static void key_delsav (struct secasvar *);
386 static struct secashead *key_getsah (struct secasindex *);
387 static struct secasvar *key_checkspidup (struct secasindex *, u_int32_t);
388 static struct secasvar *key_getsavbyspi (struct secashead *, u_int32_t);
389 static int key_setsaval (struct secasvar *, struct mbuf *,
390 const struct sadb_msghdr *);
391 static int key_mature (struct secasvar *);
392 static struct mbuf *key_setdumpsa (struct secasvar *, u_int8_t,
393 u_int8_t, u_int32_t, u_int32_t);
394 static struct mbuf *key_setsadbmsg (u_int8_t, u_int16_t, u_int8_t,
395 u_int32_t, pid_t, u_int16_t);
396 static struct mbuf *key_setsadbsa (struct secasvar *);
397 static struct mbuf *key_setsadbaddr (u_int16_t,
398 const struct sockaddr *, u_int8_t, u_int16_t);
399 #if 0
400 static struct mbuf *key_setsadbident (u_int16_t, u_int16_t, caddr_t,
401 int, u_int64_t);
402 #endif
403 static struct mbuf *key_setsadbxsa2 (u_int8_t, u_int32_t, u_int32_t);
404 static struct mbuf *key_setsadbxpolicy (u_int16_t, u_int8_t,
405 u_int32_t);
406 static void *key_newbuf (const void *, u_int);
407 #ifdef INET6
408 static int key_ismyaddr6 (struct sockaddr_in6 *);
409 #endif
410
411 /* flags for key_cmpsaidx() */
412 #define CMP_HEAD 1 /* protocol, addresses. */
413 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
414 #define CMP_REQID 3 /* additionally HEAD, reaid. */
415 #define CMP_EXACTLY 4 /* all elements. */
416 static int key_cmpsaidx
417 (const struct secasindex *, const struct secasindex *, int);
418
419 static int key_cmpspidx_exactly
420 (struct secpolicyindex *, struct secpolicyindex *);
421 static int key_cmpspidx_withmask
422 (struct secpolicyindex *, struct secpolicyindex *);
423 static int key_sockaddrcmp (const struct sockaddr *, const struct sockaddr *, int);
424 static int key_bbcmp (const void *, const void *, u_int);
425 static void key_srandom (void);
426 static u_int16_t key_satype2proto (u_int8_t);
427 static u_int8_t key_proto2satype (u_int16_t);
428
429 static int key_getspi (struct socket *, struct mbuf *,
430 const struct sadb_msghdr *);
431 static u_int32_t key_do_getnewspi (struct sadb_spirange *,
432 struct secasindex *);
433 static int key_update (struct socket *, struct mbuf *,
434 const struct sadb_msghdr *);
435 #ifdef IPSEC_DOSEQCHECK
436 static struct secasvar *key_getsavbyseq (struct secashead *, u_int32_t);
437 #endif
438 static int key_add (struct socket *, struct mbuf *,
439 const struct sadb_msghdr *);
440 static int key_setident (struct secashead *, struct mbuf *,
441 const struct sadb_msghdr *);
442 static struct mbuf *key_getmsgbuf_x1 (struct mbuf *,
443 const struct sadb_msghdr *);
444 static int key_delete (struct socket *, struct mbuf *,
445 const struct sadb_msghdr *);
446 static int key_get (struct socket *, struct mbuf *,
447 const struct sadb_msghdr *);
448
449 static void key_getcomb_setlifetime (struct sadb_comb *);
450 static struct mbuf *key_getcomb_esp (void);
451 static struct mbuf *key_getcomb_ah (void);
452 static struct mbuf *key_getcomb_ipcomp (void);
453 static struct mbuf *key_getprop (const struct secasindex *);
454
455 static int key_acquire (const struct secasindex *, struct secpolicy *);
456 #ifndef IPSEC_NONBLOCK_ACQUIRE
457 static struct secacq *key_newacq (const struct secasindex *);
458 static struct secacq *key_getacq (const struct secasindex *);
459 static struct secacq *key_getacqbyseq (u_int32_t);
460 #endif
461 static struct secspacq *key_newspacq (struct secpolicyindex *);
462 static struct secspacq *key_getspacq (struct secpolicyindex *);
463 static int key_acquire2 (struct socket *, struct mbuf *,
464 const struct sadb_msghdr *);
465 static int key_register (struct socket *, struct mbuf *,
466 const struct sadb_msghdr *);
467 static int key_expire (struct secasvar *);
468 static int key_flush (struct socket *, struct mbuf *,
469 const struct sadb_msghdr *);
470 static int key_dump (struct socket *, struct mbuf *,
471 const struct sadb_msghdr *);
472 static int key_promisc (struct socket *, struct mbuf *,
473 const struct sadb_msghdr *);
474 static int key_senderror (struct socket *, struct mbuf *, int);
475 static int key_validate_ext (const struct sadb_ext *, int);
476 static int key_align (struct mbuf *, struct sadb_msghdr *);
477 #if 0
478 static const char *key_getfqdn (void);
479 static const char *key_getuserfqdn (void);
480 #endif
481 static void key_sa_chgstate (struct secasvar *, u_int8_t);
482 static struct mbuf *key_alloc_mbuf (int);
483
484 #define SA_ADDREF(p) do { \
485 (p)->refcnt++; \
486 KASSERT((p)->refcnt != 0, \
487 ("SA refcnt overflow at %s:%u", __FILE__, __LINE__)); \
488 } while (0)
489 #define SA_DELREF(p) do { \
490 KASSERT((p)->refcnt > 0, \
491 ("SA refcnt underflow at %s:%u", __FILE__, __LINE__)); \
492 (p)->refcnt--; \
493 } while (0)
494
495 #define SP_ADDREF(p) do { \
496 (p)->refcnt++; \
497 KASSERT((p)->refcnt != 0, \
498 ("SP refcnt overflow at %s:%u", __FILE__, __LINE__)); \
499 } while (0)
500 #define SP_DELREF(p) do { \
501 KASSERT((p)->refcnt > 0, \
502 ("SP refcnt underflow at %s:%u", __FILE__, __LINE__)); \
503 (p)->refcnt--; \
504 } while (0)
505
506 /*
507 * Return 0 when there are known to be no SP's for the specified
508 * direction. Otherwise return 1. This is used by IPsec code
509 * to optimize performance.
510 */
511 int
512 key_havesp(u_int dir)
513 {
514 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
515 LIST_FIRST(&sptree[dir]) != NULL : 1);
516 }
517
518 /* %%% IPsec policy management */
519 /*
520 * allocating a SP for OUTBOUND or INBOUND packet.
521 * Must call key_freesp() later.
522 * OUT: NULL: not found
523 * others: found and return the pointer.
524 */
525 struct secpolicy *
526 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag)
527 {
528 struct secpolicy *sp;
529
530
531 KASSERT(spidx != NULL, ("key_allocsp: null spidx"));
532 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
533 ("key_allocsp: invalid direction %u", dir));
534
535 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
536 kprintf("DP key_allocsp from %s:%u\n", where, tag));
537
538 /* get a SP entry */
539 crit_enter();
540 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
541 kprintf("*** objects\n"); kdebug_secpolicyindex(spidx));
542
543 LIST_FOREACH(sp, &sptree[dir], chain) {
544 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
545 kprintf("*** in SPD\n");
546 kdebug_secpolicyindex(&sp->spidx));
547
548 if (sp->state == IPSEC_SPSTATE_DEAD)
549 continue;
550 if (key_cmpspidx_withmask(&sp->spidx, spidx))
551 goto found;
552 }
553 sp = NULL;
554 found:
555 if (sp) {
556 /* sanity check */
557 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp");
558
559 /* found a SPD entry */
560 sp->lastused = time_second;
561 SP_ADDREF(sp);
562 }
563 crit_exit();
564
565 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
566 kprintf("DP key_allocsp return SP:%p (ID=%u) refcnt %u\n",
567 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
568 return sp;
569 }
570
571 /*
572 * allocating a SP for OUTBOUND or INBOUND packet.
573 * Must call key_freesp() later.
574 * OUT: NULL: not found
575 * others: found and return the pointer.
576 */
577 struct secpolicy *
578 key_allocsp2(u_int32_t spi,
579 union sockaddr_union *dst,
580 u_int8_t proto,
581 u_int dir,
582 const char* where, int tag)
583 {
584 struct secpolicy *sp;
585
586
587 KASSERT(dst != NULL, ("key_allocsp2: null dst"));
588 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
589 ("key_allocsp2: invalid direction %u", dir));
590
591 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
592 kprintf("DP key_allocsp2 from %s:%u\n", where, tag));
593
594 /* get a SP entry */
595 crit_enter();
596 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
597 kprintf("*** objects\n");
598 kprintf("spi %u proto %u dir %u\n", spi, proto, dir);
599 kdebug_sockaddr(&dst->sa));
600
601 LIST_FOREACH(sp, &sptree[dir], chain) {
602 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
603 kprintf("*** in SPD\n");
604 kdebug_secpolicyindex(&sp->spidx));
605
606 if (sp->state == IPSEC_SPSTATE_DEAD)
607 continue;
608 /* compare simple values, then dst address */
609 if (sp->spidx.ul_proto != proto)
610 continue;
611 /* NB: spi's must exist and match */
612 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi)
613 continue;
614 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0)
615 goto found;
616 }
617 sp = NULL;
618 found:
619 if (sp) {
620 /* sanity check */
621 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp2");
622
623 /* found a SPD entry */
624 sp->lastused = time_second;
625 SP_ADDREF(sp);
626 }
627 crit_exit();
628
629 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
630 kprintf("DP key_allocsp2 return SP:%p (ID=%u) refcnt %u\n",
631 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
632 return sp;
633 }
634
635 /*
636 * return a policy that matches this particular inbound packet.
637 * XXX slow
638 */
639 struct secpolicy *
640 key_gettunnel(const struct sockaddr *osrc,
641 const struct sockaddr *odst,
642 const struct sockaddr *isrc,
643 const struct sockaddr *idst,
644 const char* where, int tag)
645 {
646 struct secpolicy *sp;
647 const int dir = IPSEC_DIR_INBOUND;
648
649 struct ipsecrequest *r1, *r2, *p;
650 struct secpolicyindex spidx;
651
652 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
653 kprintf("DP key_gettunnel from %s:%u\n", where, tag));
654
655 if (isrc->sa_family != idst->sa_family) {
656 ipseclog((LOG_ERR, "protocol family mismatched %d != %d\n.",
657 isrc->sa_family, idst->sa_family));
658 sp = NULL;
659 goto done;
660 }
661
662 crit_enter();
663 LIST_FOREACH(sp, &sptree[dir], chain) {
664 if (sp->state == IPSEC_SPSTATE_DEAD)
665 continue;
666
667 r1 = r2 = NULL;
668 for (p = sp->req; p; p = p->next) {
669 if (p->saidx.mode != IPSEC_MODE_TUNNEL)
670 continue;
671
672 r1 = r2;
673 r2 = p;
674
675 if (!r1) {
676 /* here we look at address matches only */
677 spidx = sp->spidx;
678 if (isrc->sa_len > sizeof(spidx.src) ||
679 idst->sa_len > sizeof(spidx.dst))
680 continue;
681 bcopy(isrc, &spidx.src, isrc->sa_len);
682 bcopy(idst, &spidx.dst, idst->sa_len);
683 if (!key_cmpspidx_withmask(&sp->spidx, &spidx))
684 continue;
685 } else {
686 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) ||
687 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0))
688 continue;
689 }
690
691 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) ||
692 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0))
693 continue;
694
695 goto found;
696 }
697 }
698 sp = NULL;
699 found:
700 if (sp) {
701 sp->lastused = time_second;
702 SP_ADDREF(sp);
703 }
704 crit_exit();
705 done:
706 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
707 kprintf("DP key_gettunnel return SP:%p (ID=%u) refcnt %u\n",
708 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
709 return sp;
710 }
711
712 /*
713 * allocating an SA entry for an *OUTBOUND* packet.
714 * checking each request entries in SP, and acquire an SA if need.
715 * OUT: 0: there are valid requests.
716 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
717 */
718 int
719 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx)
720 {
721 u_int level;
722 int error;
723
724 KASSERT(isr != NULL, ("key_checkrequest: null isr"));
725 KASSERT(saidx != NULL, ("key_checkrequest: null saidx"));
726 KASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
727 saidx->mode == IPSEC_MODE_TUNNEL,
728 ("key_checkrequest: unexpected policy %u", saidx->mode));
729
730 /* get current level */
731 level = ipsec_get_reqlevel(isr);
732
733 /*
734 * XXX guard against protocol callbacks from the crypto
735 * thread as they reference ipsecrequest.sav which we
736 * temporarily null out below. Need to rethink how we
737 * handle bundled SA's in the callback thread.
738 */
739 #if 0
740 /*
741 * We do allocate new SA only if the state of SA in the holder is
742 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest.
743 */
744 if (isr->sav != NULL) {
745 if (isr->sav->sah == NULL)
746 panic("key_checkrequest: sah is null.\n");
747 if (isr->sav == (struct secasvar *)LIST_FIRST(
748 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
749 KEY_FREESAV(&isr->sav);
750 isr->sav = NULL;
751 }
752 }
753 #else
754 /*
755 * we free any SA stashed in the IPsec request because a different
756 * SA may be involved each time this request is checked, either
757 * because new SAs are being configured, or this request is
758 * associated with an unconnected datagram socket, or this request
759 * is associated with a system default policy.
760 *
761 * The operation may have negative impact to performance. We may
762 * want to check cached SA carefully, rather than picking new SA
763 * every time.
764 */
765 if (isr->sav != NULL) {
766 KEY_FREESAV(&isr->sav);
767 isr->sav = NULL;
768 }
769 #endif
770
771 /*
772 * new SA allocation if no SA found.
773 * key_allocsa_policy should allocate the oldest SA available.
774 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
775 */
776 if (isr->sav == NULL)
777 isr->sav = key_allocsa_policy(saidx);
778
779 /* When there is SA. */
780 if (isr->sav != NULL) {
781 if (isr->sav->state != SADB_SASTATE_MATURE &&
782 isr->sav->state != SADB_SASTATE_DYING)
783 return EINVAL;
784 return 0;
785 }
786
787 /* there is no SA */
788 error = key_acquire(saidx, isr->sp);
789 if (error != 0) {
790 /* XXX What should I do ? */
791 ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned "
792 "from key_acquire.\n", error));
793 return error;
794 }
795
796 if (level != IPSEC_LEVEL_REQUIRE) {
797 /* XXX sigh, the interface to this routine is botched */
798 KASSERT(isr->sav == NULL, ("key_checkrequest: unexpected SA"));
799 return 0;
800 } else {
801 return ENOENT;
802 }
803 }
804
805 /*
806 * allocating a SA for policy entry from SAD.
807 * NOTE: searching SAD of aliving state.
808 * OUT: NULL: not found.
809 * others: found and return the pointer.
810 */
811 static struct secasvar *
812 key_allocsa_policy(const struct secasindex *saidx)
813 {
814 struct secashead *sah;
815 struct secasvar *sav;
816 u_int stateidx, state;
817
818 LIST_FOREACH(sah, &sahtree, chain) {
819 if (sah->state == SADB_SASTATE_DEAD)
820 continue;
821 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
822 goto found;
823 }
824
825 return NULL;
826
827 found:
828
829 /* search valid state */
830 for (stateidx = 0;
831 stateidx < _ARRAYLEN(saorder_state_valid);
832 stateidx++) {
833
834 state = saorder_state_valid[stateidx];
835
836 sav = key_do_allocsa_policy(sah, state);
837 if (sav != NULL)
838 return sav;
839 }
840
841 return NULL;
842 }
843
844 /*
845 * searching SAD with direction, protocol, mode and state.
846 * called by key_allocsa_policy().
847 * OUT:
848 * NULL : not found
849 * others : found, pointer to a SA.
850 */
851 static struct secasvar *
852 key_do_allocsa_policy(struct secashead *sah, u_int state)
853 {
854 struct secasvar *sav, *nextsav, *candidate = NULL, *d;
855
856 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain, nextsav) {
857 /* sanity check */
858 KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy");
859
860 /* initialize */
861 if (candidate == NULL) {
862 candidate = sav;
863 continue;
864 }
865
866 /* Which SA is the better ? */
867
868 /* sanity check 2 */
869 if (candidate->lft_c == NULL || sav->lft_c == NULL)
870 panic("key_do_allocsa_policy: "
871 "lifetime_current is NULL.\n");
872
873 /* What the best method is to compare ? */
874 if (key_prefered_oldsa) {
875 if (candidate->lft_c->sadb_lifetime_addtime >
876 sav->lft_c->sadb_lifetime_addtime) {
877 candidate = sav;
878 }
879 continue;
880 }
881
882 /* prefered new sa rather than old sa */
883 if (candidate->lft_c->sadb_lifetime_addtime <
884 sav->lft_c->sadb_lifetime_addtime) {
885 d = candidate;
886 candidate = sav;
887 } else
888 d = sav;
889
890 /*
891 * prepared to delete the SA when there is more
892 * suitable candidate and the lifetime of the SA is not
893 * permanent.
894 */
895 if (d->lft_c->sadb_lifetime_addtime != 0) {
896 struct mbuf *m, *result;
897 u_int8_t satype;
898
899 key_sa_chgstate(d, SADB_SASTATE_DEAD);
900
901 KASSERT(d->refcnt > 0,
902 ("key_do_allocsa_policy: bogus ref count"));
903
904 satype = key_proto2satype(d->sah->saidx.proto);
905 if (satype == 0)
906 goto msgfail;
907
908 m = key_setsadbmsg(SADB_DELETE, 0, satype, 0, 0,
909 d->refcnt - 1);
910 if (!m)
911 goto msgfail;
912 result = m;
913
914 /* set sadb_address for saidx's. */
915 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
916 &d->sah->saidx.src.sa,
917 d->sah->saidx.src.sa.sa_len << 3,
918 IPSEC_ULPROTO_ANY);
919 if (!m)
920 goto msgfail;
921 m_cat(result, m);
922
923 /* set sadb_address for saidx's. */
924 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
925 &d->sah->saidx.dst.sa,
926 d->sah->saidx.dst.sa.sa_len << 3,
927 IPSEC_ULPROTO_ANY);
928 if (!m)
929 goto msgfail;
930 m_cat(result, m);
931
932 /* create SA extension */
933 m = key_setsadbsa(d);
934 if (!m)
935 goto msgfail;
936 m_cat(result, m);
937
938 if (result->m_len < sizeof(struct sadb_msg)) {
939 result = m_pullup(result,
940 sizeof(struct sadb_msg));
941 if (result == NULL)
942 goto msgfail;
943 }
944
945 result->m_pkthdr.len = m_lengthm(result, NULL);
946 mtod(result, struct sadb_msg *)->sadb_msg_len =
947 PFKEY_UNIT64(result->m_pkthdr.len);
948
949 if (key_sendup_mbuf(NULL, result,
950 KEY_SENDUP_REGISTERED))
951 goto msgfail;
952 msgfail:
953 KEY_FREESAV(&d);
954 }
955 }
956
957 if (candidate) {
958 SA_ADDREF(candidate);
959 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
960 kprintf("DP allocsa_policy cause refcnt++:%d SA:%p\n",
961 candidate->refcnt, candidate));
962 }
963 return candidate;
964 }
965
966 /*
967 * allocating a usable SA entry for a *INBOUND* packet.
968 * Must call key_freesav() later.
969 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
970 * NULL: not found, or error occured.
971 *
972 * In the comparison, no source address is used--for RFC2401 conformance.
973 * To quote, from section 4.1:
974 * A security association is uniquely identified by a triple consisting
975 * of a Security Parameter Index (SPI), an IP Destination Address, and a
976 * security protocol (AH or ESP) identifier.
977 * Note that, however, we do need to keep source address in IPsec SA.
978 * IKE specification and PF_KEY specification do assume that we
979 * keep source address in IPsec SA. We see a tricky situation here.
980 */
981 struct secasvar *
982 key_allocsa(
983 union sockaddr_union *dst,
984 u_int proto,
985 u_int32_t spi,
986 const char* where, int tag)
987 {
988 struct secashead *sah;
989 struct secasvar *sav;
990 u_int stateidx, state;
991
992
993 KASSERT(dst != NULL, ("key_allocsa: null dst address"));
994
995 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
996 kprintf("DP key_allocsa from %s:%u\n", where, tag));
997
998 /*
999 * searching SAD.
1000 * XXX: to be checked internal IP header somewhere. Also when
1001 * IPsec tunnel packet is received. But ESP tunnel mode is
1002 * encrypted so we can't check internal IP header.
1003 */
1004 crit_enter();
1005 LIST_FOREACH(sah, &sahtree, chain) {
1006 /* search valid state */
1007 for (stateidx = 0;
1008 stateidx < _ARRAYLEN(saorder_state_valid);
1009 stateidx++) {
1010 state = saorder_state_valid[stateidx];
1011 LIST_FOREACH(sav, &sah->savtree[state], chain) {
1012 /* sanity check */
1013 KEY_CHKSASTATE(sav->state, state, "key_allocsav");
1014 /* do not return entries w/ unusable state */
1015 if (sav->state != SADB_SASTATE_MATURE &&
1016 sav->state != SADB_SASTATE_DYING)
1017 continue;
1018 if (proto != sav->sah->saidx.proto)
1019 continue;
1020 if (spi != sav->spi)
1021 continue;
1022 #if 0 /* don't check src */
1023 /* check src address */
1024 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0)
1025 continue;
1026 #endif
1027 /* check dst address */
1028 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0)
1029 continue;
1030 SA_ADDREF(sav);
1031 goto done;
1032 }
1033 }
1034 }
1035 sav = NULL;
1036 done:
1037 crit_exit();
1038
1039 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1040 kprintf("DP key_allocsa return SA:%p; refcnt %u\n",
1041 sav, sav ? sav->refcnt : 0));
1042 return sav;
1043 }
1044
1045 /*
1046 * Must be called after calling key_allocsp().
1047 * For both the packet without socket and key_freeso().
1048 */
1049 void
1050 _key_freesp(struct secpolicy **spp, const char* where, int tag)
1051 {
1052 struct secpolicy *sp = *spp;
1053
1054 KASSERT(sp != NULL, ("key_freesp: null sp"));
1055
1056 SP_DELREF(sp);
1057
1058 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1059 kprintf("DP key_freesp SP:%p (ID=%u) from %s:%u; refcnt now %u\n",
1060 sp, sp->id, where, tag, sp->refcnt));
1061
1062 if (sp->refcnt == 0) {
1063 *spp = NULL;
1064 key_delsp(sp);
1065 }
1066 }
1067
1068 /*
1069 * Must be called after calling key_allocsp().
1070 * For the packet with socket.
1071 */
1072 void
1073 key_freeso(struct socket *so)
1074 {
1075 /* sanity check */
1076 KASSERT(so != NULL, ("key_freeso: null so"));
1077
1078 switch (so->so_proto->pr_domain->dom_family) {
1079 #ifdef INET
1080 case PF_INET:
1081 {
1082 struct inpcb *pcb = so->so_pcb;
1083
1084 /* Does it have a PCB ? */
1085 if (pcb == NULL)
1086 return;
1087 key_freesp_so(&pcb->inp_sp->sp_in);
1088 key_freesp_so(&pcb->inp_sp->sp_out);
1089 }
1090 break;
1091 #endif
1092 #ifdef INET6
1093 case PF_INET6:
1094 {
1095 #ifdef HAVE_NRL_INPCB
1096 struct inpcb *pcb = so->so_pcb;
1097
1098 /* Does it have a PCB ? */
1099 if (pcb == NULL)
1100 return;
1101 key_freesp_so(&pcb->inp_sp->sp_in);
1102 key_freesp_so(&pcb->inp_sp->sp_out);
1103 #else
1104 struct in6pcb *pcb = so->so_pcb;
1105
1106 /* Does it have a PCB ? */
1107 if (pcb == NULL)
1108 return;
1109 key_freesp_so(&pcb->in6p_sp->sp_in);
1110 key_freesp_so(&pcb->in6p_sp->sp_out);
1111 #endif
1112 }
1113 break;
1114 #endif /* INET6 */
1115 default:
1116 ipseclog((LOG_DEBUG, "key_freeso: unknown address family=%d.\n",
1117 so->so_proto->pr_domain->dom_family));
1118 return;
1119 }
1120 }
1121
1122 static void
1123 key_freesp_so(struct secpolicy **sp)
1124 {
1125 KASSERT(sp != NULL && *sp != NULL, ("key_freesp_so: null sp"));
1126
1127 if ((*sp)->policy == IPSEC_POLICY_ENTRUST ||
1128 (*sp)->policy == IPSEC_POLICY_BYPASS)
1129 return;
1130
1131 KASSERT((*sp)->policy == IPSEC_POLICY_IPSEC,
1132 ("key_freesp_so: invalid policy %u", (*sp)->policy));
1133 KEY_FREESP(sp);
1134 }
1135
1136 /*
1137 * Must be called after calling key_allocsa().
1138 * This function is called by key_freesp() to free some SA allocated
1139 * for a policy.
1140 */
1141 void
1142 key_freesav(struct secasvar **psav, const char* where, int tag)
1143 {
1144 struct secasvar *sav = *psav;
1145
1146 KASSERT(sav != NULL, ("key_freesav: null sav"));
1147
1148 SA_DELREF(sav);
1149
1150 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1151 kprintf("DP key_freesav SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
1152 sav, ntohl(sav->spi), where, tag, sav->refcnt));
1153
1154 if (sav->refcnt == 0) {
1155 *psav = NULL;
1156 key_delsav(sav);
1157 }
1158 }
1159
1160 /* %%% SPD management */
1161 /*
1162 * free security policy entry.
1163 */
1164 static void
1165 key_delsp(struct secpolicy *sp)
1166 {
1167
1168
1169 KASSERT(sp != NULL, ("key_delsp: null sp"));
1170
1171 sp->state = IPSEC_SPSTATE_DEAD;
1172
1173 KASSERT(sp->refcnt == 0,
1174 ("key_delsp: SP with references deleted (refcnt %u)",
1175 sp->refcnt));
1176
1177 crit_enter();
1178 /* remove from SP index */
1179 if (__LIST_CHAINED(sp))
1180 LIST_REMOVE(sp, chain);
1181
1182 {
1183 struct ipsecrequest *isr = sp->req, *nextisr;
1184
1185 while (isr != NULL) {
1186 if (isr->sav != NULL) {
1187 KEY_FREESAV(&isr->sav);
1188 isr->sav = NULL;
1189 }
1190
1191 nextisr = isr->next;
1192 KFREE(isr);
1193 isr = nextisr;
1194 }
1195 }
1196
1197 KFREE(sp);
1198
1199 crit_exit();
1200 }
1201
1202 /*
1203 * search SPD
1204 * OUT: NULL : not found
1205 * others : found, pointer to a SP.
1206 */
1207 static struct secpolicy *
1208 key_getsp(struct secpolicyindex *spidx)
1209 {
1210 struct secpolicy *sp;
1211
1212 KASSERT(spidx != NULL, ("key_getsp: null spidx"));
1213
1214 LIST_FOREACH(sp, &sptree[spidx->dir], chain) {
1215 if (sp->state == IPSEC_SPSTATE_DEAD)
1216 continue;
1217 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1218 SP_ADDREF(sp);
1219 return sp;
1220 }
1221 }
1222
1223 return NULL;
1224 }
1225
1226 /*
1227 * get SP by index.
1228 * OUT: NULL : not found
1229 * others : found, pointer to a SP.
1230 */
1231 static struct secpolicy *
1232 key_getspbyid(u_int32_t id)
1233 {
1234 struct secpolicy *sp;
1235
1236 LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) {
1237 if (sp->state == IPSEC_SPSTATE_DEAD)
1238 continue;
1239 if (sp->id == id) {
1240 SP_ADDREF(sp);
1241 return sp;
1242 }
1243 }
1244
1245 LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) {
1246 if (sp->state == IPSEC_SPSTATE_DEAD)
1247 continue;
1248 if (sp->id == id) {
1249 SP_ADDREF(sp);
1250 return sp;
1251 }
1252 }
1253
1254 return NULL;
1255 }
1256
1257 struct secpolicy *
1258 key_newsp(const char* where, int tag)
1259 {
1260 struct secpolicy *newsp = NULL;
1261
1262 newsp = kmalloc(sizeof(struct secpolicy), M_SECA,
1263 M_INTWAIT | M_ZERO | M_NULLOK);
1264 if (newsp) {
1265 newsp->refcnt = 1;
1266 newsp->req = NULL;
1267 }
1268
1269 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1270 kprintf("DP key_newsp from %s:%u return SP:%p\n",
1271 where, tag, newsp));
1272 return newsp;
1273 }
1274
1275 /*
1276 * create secpolicy structure from sadb_x_policy structure.
1277 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
1278 * so must be set properly later.
1279 */
1280 struct secpolicy *
1281 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
1282 {
1283 struct secpolicy *newsp;
1284
1285 /* sanity check */
1286 if (xpl0 == NULL)
1287 panic("key_msg2sp: NULL pointer was passed.\n");
1288 if (len < sizeof(*xpl0))
1289 panic("key_msg2sp: invalid length.\n");
1290 if (len != PFKEY_EXTLEN(xpl0)) {
1291 ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n"));
1292 *error = EINVAL;
1293 return NULL;
1294 }
1295
1296 if ((newsp = KEY_NEWSP()) == NULL) {
1297 *error = ENOBUFS;
1298 return NULL;
1299 }
1300
1301 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1302 newsp->policy = xpl0->sadb_x_policy_type;
1303
1304 /* check policy */
1305 switch (xpl0->sadb_x_policy_type) {
1306 case IPSEC_POLICY_DISCARD:
1307 case IPSEC_POLICY_NONE:
1308 case IPSEC_POLICY_ENTRUST:
1309 case IPSEC_POLICY_BYPASS:
1310 newsp->req = NULL;
1311 break;
1312
1313 case IPSEC_POLICY_IPSEC:
1314 {
1315 int tlen;
1316 struct sadb_x_ipsecrequest *xisr;
1317 struct ipsecrequest **p_isr = &newsp->req;
1318
1319 /* validity check */
1320 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1321 ipseclog((LOG_DEBUG,
1322 "key_msg2sp: Invalid msg length.\n"));
1323 KEY_FREESP(&newsp);
1324 *error = EINVAL;
1325 return NULL;
1326 }
1327
1328 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1329 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1330
1331 while (tlen > 0) {
1332 /* length check */
1333 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
1334 ipseclog((LOG_DEBUG, "key_msg2sp: "
1335 "invalid ipsecrequest length.\n"));
1336 KEY_FREESP(&newsp);
1337 *error = EINVAL;
1338 return NULL;
1339 }
1340
1341 /* allocate request buffer */
1342 KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr));
1343 if ((*p_isr) == NULL) {
1344 ipseclog((LOG_DEBUG,
1345 "key_msg2sp: No more memory.\n"));
1346 KEY_FREESP(&newsp);
1347 *error = ENOBUFS;
1348 return NULL;
1349 }
1350 bzero(*p_isr, sizeof(**p_isr));
1351
1352 /* set values */
1353 (*p_isr)->next = NULL;
1354
1355 switch (xisr->sadb_x_ipsecrequest_proto) {
1356 case IPPROTO_ESP:
1357 case IPPROTO_AH:
1358 case IPPROTO_IPCOMP:
1359 break;
1360 default:
1361 ipseclog((LOG_DEBUG,
1362 "key_msg2sp: invalid proto type=%u\n",
1363 xisr->sadb_x_ipsecrequest_proto));
1364 KEY_FREESP(&newsp);
1365 *error = EPROTONOSUPPORT;
1366 return NULL;
1367 }
1368 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;
1369
1370 switch (xisr->sadb_x_ipsecrequest_mode) {
1371 case IPSEC_MODE_TRANSPORT:
1372 case IPSEC_MODE_TUNNEL:
1373 break;
1374 case IPSEC_MODE_ANY:
1375 default:
1376 ipseclog((LOG_DEBUG,
1377 "key_msg2sp: invalid mode=%u\n",
1378 xisr->sadb_x_ipsecrequest_mode));
1379 KEY_FREESP(&newsp);
1380 *error = EINVAL;
1381 return NULL;
1382 }
1383 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1384
1385 switch (xisr->sadb_x_ipsecrequest_level) {
1386 case IPSEC_LEVEL_DEFAULT:
1387 case IPSEC_LEVEL_USE:
1388 case IPSEC_LEVEL_REQUIRE:
1389 break;
1390 case IPSEC_LEVEL_UNIQUE:
1391 /* validity check */
1392 /*
1393 * If range violation of reqid, kernel will
1394 * update it, don't refuse it.
1395 */
1396 if (xisr->sadb_x_ipsecrequest_reqid
1397 > IPSEC_MANUAL_REQID_MAX) {
1398 ipseclog((LOG_DEBUG,
1399 "key_msg2sp: reqid=%d range "
1400 "violation, updated by kernel.\n",
1401 xisr->sadb_x_ipsecrequest_reqid));
1402 xisr->sadb_x_ipsecrequest_reqid = 0;
1403 }
1404
1405 /* allocate new reqid id if reqid is zero. */
1406 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1407 u_int32_t reqid;
1408 if ((reqid = key_newreqid()) == 0) {
1409 KEY_FREESP(&newsp);
1410 *error = ENOBUFS;
1411 return NULL;
1412 }
1413 (*p_isr)->saidx.reqid = reqid;
1414 xisr->sadb_x_ipsecrequest_reqid = reqid;
1415 } else {
1416 /* set it for manual keying. */
1417 (*p_isr)->saidx.reqid =
1418 xisr->sadb_x_ipsecrequest_reqid;
1419 }
1420 break;
1421
1422 default:
1423 ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n",
1424 xisr->sadb_x_ipsecrequest_level));
1425 KEY_FREESP(&newsp);
1426 *error = EINVAL;
1427 return NULL;
1428 }
1429 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level;
1430
1431 /* set IP addresses if there */
1432 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1433 struct sockaddr *paddr;
1434
1435 paddr = (struct sockaddr *)(xisr + 1);
1436
1437 /* validity check */
1438 if (paddr->sa_len
1439 > sizeof((*p_isr)->saidx.src)) {
1440 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
1441 "address length.\n"));
1442 KEY_FREESP(&newsp);
1443 *error = EINVAL;
1444 return NULL;
1445 }
1446 bcopy(paddr, &(*p_isr)->saidx.src,
1447 paddr->sa_len);
1448
1449 paddr = (struct sockaddr *)((caddr_t)paddr
1450 + paddr->sa_len);
1451
1452 /* validity check */
1453 if (paddr->sa_len
1454 > sizeof((*p_isr)->saidx.dst)) {
1455 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
1456 "address length.\n"));
1457 KEY_FREESP(&newsp);
1458 *error = EINVAL;
1459 return NULL;
1460 }
1461 bcopy(paddr, &(*p_isr)->saidx.dst,
1462 paddr->sa_len);
1463 }
1464
1465 (*p_isr)->sav = NULL;
1466 (*p_isr)->sp = newsp;
1467
1468 /* initialization for the next. */
1469 p_isr = &(*p_isr)->next;
1470 tlen -= xisr->sadb_x_ipsecrequest_len;
1471
1472 /* validity check */
1473 if (tlen < 0) {
1474 ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n"));
1475 KEY_FREESP(&newsp);
1476 *error = EINVAL;
1477 return NULL;
1478 }
1479
1480 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1481 + xisr->sadb_x_ipsecrequest_len);
1482 }
1483 }
1484 break;
1485 default:
1486 ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n"));
1487 KEY_FREESP(&newsp);
1488 *error = EINVAL;
1489 return NULL;
1490 }
1491
1492 *error = 0;
1493 return newsp;
1494 }
1495
1496 static u_int32_t
1497 key_newreqid(void)
1498 {
1499 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1500
1501 auto_reqid = (auto_reqid == ~0
1502 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);
1503
1504 /* XXX should be unique check */
1505
1506 return auto_reqid;
1507 }
1508
1509 /*
1510 * copy secpolicy struct to sadb_x_policy structure indicated.
1511 */
1512 struct mbuf *
1513 key_sp2msg(struct secpolicy *sp)
1514 {
1515 struct sadb_x_policy *xpl;
1516 int tlen;
1517 caddr_t p;
1518 struct mbuf *m;
1519
1520 /* sanity check. */
1521 if (sp == NULL)
1522 panic("key_sp2msg: NULL pointer was passed.\n");
1523
1524 tlen = key_getspreqmsglen(sp);
1525
1526 m = key_alloc_mbuf(tlen);
1527 if (!m || m->m_next) { /*XXX*/
1528 if (m)
1529 m_freem(m);
1530 return NULL;
1531 }
1532
1533 m->m_len = tlen;
1534 m->m_next = NULL;
1535 xpl = mtod(m, struct sadb_x_policy *);
1536 bzero(xpl, tlen);
1537
1538 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
1539 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1540 xpl->sadb_x_policy_type = sp->policy;
1541 xpl->sadb_x_policy_dir = sp->spidx.dir;
1542 xpl->sadb_x_policy_id = sp->id;
1543 p = (caddr_t)xpl + sizeof(*xpl);
1544
1545 /* if is the policy for ipsec ? */
1546 if (sp->policy == IPSEC_POLICY_IPSEC) {
1547 struct sadb_x_ipsecrequest *xisr;
1548 struct ipsecrequest *isr;
1549
1550 for (isr = sp->req; isr != NULL; isr = isr->next) {
1551
1552 xisr = (struct sadb_x_ipsecrequest *)p;
1553
1554 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1555 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1556 xisr->sadb_x_ipsecrequest_level = isr->level;
1557 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1558
1559 p += sizeof(*xisr);
1560 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1561 p += isr->saidx.src.sa.sa_len;
1562 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1563 p += isr->saidx.src.sa.sa_len;
1564
1565 xisr->sadb_x_ipsecrequest_len =
1566 PFKEY_ALIGN8(sizeof(*xisr)
1567 + isr->saidx.src.sa.sa_len
1568 + isr->saidx.dst.sa.sa_len);
1569 }
1570 }
1571
1572 return m;
1573 }
1574
1575 /* m will not be freed nor modified */
1576 static struct mbuf *
1577 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1578 int ndeep, int nitem, ...)
1579 {
1580 __va_list ap;
1581 int idx;
1582 int i;
1583 struct mbuf *result = NULL, *n;
1584 int len;
1585
1586 if (m == NULL || mhp == NULL)
1587 panic("null pointer passed to key_gather");
1588
1589 __va_start(ap, nitem);
1590 for (i = 0; i < nitem; i++) {
1591 idx = __va_arg(ap, int);
1592 if (idx < 0 || idx > SADB_EXT_MAX)
1593 goto fail;
1594 /* don't attempt to pull empty extension */
1595 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1596 continue;
1597 if (idx != SADB_EXT_RESERVED &&
1598 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1599 continue;
1600
1601 if (idx == SADB_EXT_RESERVED) {
1602 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1603 #ifdef DIAGNOSTIC
1604 if (len > MHLEN)
1605 panic("assumption failed");
1606 #endif
1607 MGETHDR(n, MB_DONTWAIT, MT_DATA);
1608 if (!n)
1609 goto fail;
1610 n->m_len = len;
1611 n->m_next = NULL;
1612 m_copydata(m, 0, sizeof(struct sadb_msg),
1613 mtod(n, caddr_t));
1614 } else if (i < ndeep) {
1615 len = mhp->extlen[idx];
1616 n = key_alloc_mbuf(len);
1617 if (!n || n->m_next) { /*XXX*/
1618 if (n)
1619 m_freem(n);
1620 goto fail;
1621 }
1622 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1623 mtod(n, caddr_t));
1624 } else {
1625 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1626 MB_DONTWAIT);
1627 }
1628 if (n == NULL)
1629 goto fail;
1630
1631 if (result)
1632 m_cat(result, n);
1633 else
1634 result = n;
1635 }
1636 __va_end(ap);
1637
1638 if (result->m_flags & M_PKTHDR)
1639 result->m_pkthdr.len = m_lengthm(result, NULL);
1640
1641 return result;
1642
1643 fail:
1644 m_freem(result);
1645 return NULL;
1646 }
1647
1648 /*
1649 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1650 * add an entry to SP database, when received
1651 * <base, address(SD), (lifetime(H),) policy>
1652 * from the user(?).
1653 * Adding to SP database,
1654 * and send
1655 * <base, address(SD), (lifetime(H),) policy>
1656 * to the socket which was send.
1657 *
1658 * SPDADD set a unique policy entry.
1659 * SPDSETIDX like SPDADD without a part of policy requests.
1660 * SPDUPDATE replace a unique policy entry.
1661 *
1662 * m will always be freed.
1663 */
1664 static int
1665 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1666 {
1667 struct sadb_address *src0, *dst0;
1668 struct sadb_x_policy *xpl0, *xpl;
1669 struct sadb_lifetime *lft = NULL;
1670 struct secpolicyindex spidx;
1671 struct secpolicy *newsp;
1672 struct sockaddr *saddr, *daddr;
1673 int error;
1674
1675 /* sanity check */
1676 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
1677 panic("key_spdadd: NULL pointer is passed.\n");
1678
1679 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
1680 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
1681 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
1682 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1683 return key_senderror(so, m, EINVAL);
1684 }
1685 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
1686 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
1687 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
1688 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1689 return key_senderror(so, m, EINVAL);
1690 }
1691 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
1692 if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
1693 < sizeof(struct sadb_lifetime)) {
1694 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1695 return key_senderror(so, m, EINVAL);
1696 }
1697 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
1698 }
1699
1700 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1701 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1702 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1703
1704 /* make secindex */
1705 /* XXX boundary check against sa_len */
1706 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1707 src0 + 1,
1708 dst0 + 1,
1709 src0->sadb_address_prefixlen,
1710 dst0->sadb_address_prefixlen,
1711 src0->sadb_address_proto,
1712 &spidx);
1713
1714 /* checking the direciton. */
1715 switch (xpl0->sadb_x_policy_dir) {
1716 case IPSEC_DIR_INBOUND:
1717 case IPSEC_DIR_OUTBOUND:
1718 break;
1719 default:
1720 ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n"));
1721 mhp->msg->sadb_msg_errno = EINVAL;
1722 return 0;
1723 }
1724
1725 /* check policy */
1726 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
1727 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST
1728 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1729 ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n"));
1730 return key_senderror(so, m, EINVAL);
1731 }
1732
1733 /* policy requests are mandatory when action is ipsec. */
1734 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX
1735 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC
1736 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
1737 ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part required.\n"));
1738 return key_senderror(so, m, EINVAL);
1739 }
1740
1741 /*
1742 * checking there is SP already or not.
1743 * SPDUPDATE doesn't depend on whether there is a SP or not.
1744 * If the type is either SPDADD or SPDSETIDX AND a SP is found,
1745 * then error.
1746 */
1747 newsp = key_getsp(&spidx);
1748 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1749 if (newsp) {
1750 newsp->state = IPSEC_SPSTATE_DEAD;
1751 KEY_FREESP(&newsp);
1752 }
1753 } else {
1754 if (newsp != NULL) {
1755 KEY_FREESP(&newsp);
1756 ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists already.\n"));
1757 return key_senderror(so, m, EEXIST);
1758 }
1759 }
1760
1761 /* allocation new SP entry */
1762 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
1763 return key_senderror(so, m, error);
1764 }
1765
1766 if ((newsp->id = key_getnewspid()) == 0) {
1767 KFREE(newsp);
1768 return key_senderror(so, m, ENOBUFS);
1769 }
1770
1771 /* XXX boundary check against sa_len */
1772 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1773 src0 + 1,
1774 dst0 + 1,
1775 src0->sadb_address_prefixlen,
1776 dst0->sadb_address_prefixlen,
1777 src0->sadb_address_proto,
1778 &newsp->spidx);
1779
1780 /* sanity check on addr pair */
1781 saddr = (struct sockaddr *)(src0 + 1);
1782 daddr = (struct sockaddr *)(dst0 + 1);
1783 if (saddr->sa_family != daddr->sa_family) {
1784 KFREE(newsp);
1785 return key_senderror(so, m, EINVAL);
1786 }
1787 if (saddr->sa_len != daddr->sa_len) {
1788 KFREE(newsp);
1789 return key_senderror(so, m, EINVAL);
1790 }
1791 #if 1
1792 if (newsp->req && newsp->req->saidx.src.sa.sa_family) {
1793 if (saddr->sa_family != newsp->req->saidx.src.sa.sa_family) {
1794 KFREE(newsp);
1795 return key_senderror(so, m, EINVAL);
1796 }
1797 }
1798 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) {
1799 if (daddr->sa_family != newsp->req->saidx.dst.sa.sa_family) {
1800 KFREE(newsp);
1801 return key_senderror(so, m, EINVAL);
1802 }
1803 }
1804 #endif
1805
1806 newsp->created = time_second;
1807 newsp->lastused = newsp->created;
1808 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
1809 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
1810
1811 newsp->refcnt = 1; /* do not reclaim until I say I do */
1812 newsp->state = IPSEC_SPSTATE_ALIVE;
1813 LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain);
1814
1815 /* delete the entry in spacqtree */
1816 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1817 struct secspacq *spacq;
1818 if ((spacq = key_getspacq(&spidx)) != NULL) {
1819 /* reset counter in order to deletion by timehandler. */
1820 spacq->created = time_second;
1821 spacq->count = 0;
1822 }
1823 }
1824
1825 {
1826 struct mbuf *n, *mpolicy;
1827 struct sadb_msg *newmsg;
1828 int off;
1829
1830 /* create new sadb_msg to reply. */
1831 if (lft) {
1832 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
1833 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
1834 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1835 } else {
1836 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
1837 SADB_X_EXT_POLICY,
1838 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1839 }
1840 if (!n)
1841 return key_senderror(so, m, ENOBUFS);
1842
1843 if (n->m_len < sizeof(*newmsg)) {
1844 n = m_pullup(n, sizeof(*newmsg));
1845 if (!n)
1846 return key_senderror(so, m, ENOBUFS);
1847 }
1848 newmsg = mtod(n, struct sadb_msg *);
1849 newmsg->sadb_msg_errno = 0;
1850 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
1851
1852 off = 0;
1853 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
1854 sizeof(*xpl), &off);
1855 if (mpolicy == NULL) {
1856 /* n is already freed */
1857 return key_senderror(so, m, ENOBUFS);
1858 }
1859 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
1860 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
1861 m_freem(n);
1862 return key_senderror(so, m, EINVAL);
1863 }
1864 xpl->sadb_x_policy_id = newsp->id;
1865
1866 m_freem(m);
1867 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
1868 }
1869 }
1870
1871 /*
1872 * get new policy id.
1873 * OUT:
1874 * 0: failure.
1875 * others: success.
1876 */
1877 static u_int32_t
1878 key_getnewspid(void)
1879 {
1880 u_int32_t newid = 0;
1881 int count = key_spi_trycnt; /* XXX */
1882 struct secpolicy *sp;
1883
1884 /* when requesting to allocate spi ranged */
1885 while (count--) {
1886 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1));
1887
1888 if ((sp = key_getspbyid(newid)) == NULL)
1889 break;
1890
1891 KEY_FREESP(&sp);
1892 }
1893
1894 if (count == 0 || newid == 0) {
1895 ipseclog((LOG_DEBUG, "key_getnewspid: to allocate policy id is failed.\n"));
1896 return 0;
1897 }
1898
1899 return newid;
1900 }
1901
1902 /*
1903 * SADB_SPDDELETE processing
1904 * receive
1905 * <base, address(SD), policy(*)>
1906 * from the user(?), and set SADB_SASTATE_DEAD,
1907 * and send,
1908 * <base, address(SD), policy(*)>
1909 * to the ikmpd.
1910 * policy(*) including direction of policy.
1911 *
1912 * m will always be freed.
1913 */
1914 static int
1915 key_spddelete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1916 {
1917 struct sadb_address *src0, *dst0;
1918 struct sadb_x_policy *xpl0;
1919 struct secpolicyindex spidx;
1920 struct secpolicy *sp;
1921
1922 /* sanity check */
1923 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
1924 panic("key_spddelete: NULL pointer is passed.\n");
1925
1926 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
1927 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
1928 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
1929 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
1930 return key_senderror(so, m, EINVAL);
1931 }
1932 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
1933 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
1934 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
1935 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
1936 return key_senderror(so, m, EINVAL);
1937 }
1938
1939 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1940 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1941 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1942
1943 /* make secindex */
1944 /* XXX boundary check against sa_len */
1945 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1946 src0 + 1,
1947 dst0 + 1,
1948 src0->sadb_address_prefixlen,
1949 dst0->sadb_address_prefixlen,
1950 src0->sadb_address_proto,
1951 &spidx);
1952
1953 /* checking the direciton. */
1954 switch (xpl0->sadb_x_policy_dir) {
1955 case IPSEC_DIR_INBOUND:
1956 case IPSEC_DIR_OUTBOUND:
1957 break;
1958 default:
1959 ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n"));
1960 return key_senderror(so, m, EINVAL);
1961 }
1962
1963 /* Is there SP in SPD ? */
1964 if ((sp = key_getsp(&spidx)) == NULL) {
1965 ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n"));
1966 return key_senderror(so, m, EINVAL);
1967 }
1968
1969 /* save policy id to buffer to be returned. */
1970 xpl0->sadb_x_policy_id = sp->id;
1971
1972 sp->state = IPSEC_SPSTATE_DEAD;
1973 KEY_FREESP(&sp);
1974
1975 {
1976 struct mbuf *n;
1977 struct sadb_msg *newmsg;
1978
1979 /* create new sadb_msg to reply. */
1980 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
1981 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1982 if (!n)
1983 return key_senderror(so, m, ENOBUFS);
1984
1985 newmsg = mtod(n, struct sadb_msg *);
1986 newmsg->sadb_msg_errno = 0;
1987 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
1988
1989 m_freem(m);
1990 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
1991 }
1992 }
1993
1994 /*
1995 * SADB_SPDDELETE2 processing
1996 * receive
1997 * <base, policy(*)>
1998 * from the user(?), and set SADB_SASTATE_DEAD,
1999 * and send,
2000 * <base, policy(*)>
2001 * to the ikmpd.
2002 * policy(*) including direction of policy.
2003 *
2004 * m will always be freed.
2005 */
2006 static int
2007 key_spddelete2(struct socket *so, struct mbuf *m,
2008 const struct sadb_msghdr *mhp)
2009 {
2010 u_int32_t id;
2011 struct secpolicy *sp;
2012
2013 /* sanity check */
2014 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2015 panic("key_spddelete2: NULL pointer is passed.\n");
2016
2017 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2018 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2019 ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is passed.\n"));
2020 key_senderror(so, m, EINVAL);
2021 return 0;
2022 }
2023
2024 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2025
2026 /* Is there SP in SPD ? */
2027 if ((sp = key_getspbyid(id)) == NULL) {
2028 ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n", id));
2029 key_senderror(so, m, EINVAL);
2030 }
2031
2032 sp->state = IPSEC_SPSTATE_DEAD;
2033 KEY_FREESP(&sp);
2034
2035 {
2036 struct mbuf *n;
2037 struct sadb_msg *newmsg;
2038 int off, len;
2039
2040 /* create new sadb_msg to reply. */
2041 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2042
2043 if (len > MCLBYTES)
2044 return key_senderror(so, m, ENOBUFS);
2045 n = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
2046 if (!n)
2047 return key_senderror(so, m, ENOBUFS);
2048 n->m_len = len;
2049
2050 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
2051 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2052
2053 #ifdef DIAGNOSTIC
2054 if (off != len)
2055 panic("length inconsistency in key_spddelete2");
2056 #endif
2057
2058 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2059 mhp->extlen[SADB_X_EXT_POLICY], MB_DONTWAIT);
2060 if (!n->m_next) {
2061 m_freem(n);
2062 return key_senderror(so, m, ENOBUFS);
2063 }
2064 n->m_pkthdr.len = m_lengthm(n, NULL);
2065
2066 newmsg = mtod(n, struct sadb_msg *);
2067 newmsg->sadb_msg_errno = 0;
2068 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2069
2070 m_freem(m);
2071 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2072 }
2073 }
2074
2075 /*
2076 * SADB_X_GET processing
2077 * receive
2078 * <base, policy(*)>
2079 * from the user(?),
2080 * and send,
2081 * <base, address(SD), policy>
2082 * to the ikmpd.
2083 * policy(*) including direction of policy.
2084 *
2085 * m will always be freed.
2086 */
2087 static int
2088 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2089 {
2090 u_int32_t id;
2091 struct secpolicy *sp;
2092 struct mbuf *n;
2093
2094 /* sanity check */
2095 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2096 panic("key_spdget: NULL pointer is passed.\n");
2097
2098 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2099 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2100 ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n"));
2101 return key_senderror(so, m, EINVAL);
2102 }
2103
2104 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2105
2106 /* Is there SP in SPD ? */
2107 if ((sp = key_getspbyid(id)) == NULL) {
2108 ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id));
2109 return key_senderror(so, m, ENOENT);
2110 }
2111
2112 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
2113 if (n != NULL) {
2114 m_freem(m);
2115 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2116 } else
2117 return key_senderror(so, m, ENOBUFS);
2118 }
2119
2120 /*
2121 * SADB_X_SPDACQUIRE processing.
2122 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2123 * send
2124 * <base, policy(*)>
2125 * to KMD, and expect to receive
2126 * <base> with SADB_X_SPDACQUIRE if error occured,
2127 * or
2128 * <base, policy>
2129 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2130 * policy(*) is without policy requests.
2131 *
2132 * 0 : succeed
2133 * others: error number
2134 */
2135 int
2136 key_spdacquire(struct secpolicy *sp)
2137 {
2138 struct mbuf *result = NULL, *m;
2139 struct secspacq *newspacq;
2140 int error;
2141
2142 /* sanity check */
2143 if (sp == NULL)
2144 panic("key_spdacquire: NULL pointer is passed.\n");
2145 if (sp->req != NULL)
2146 panic("key_spdacquire: called but there is request.\n");
2147 if (sp->policy != IPSEC_POLICY_IPSEC)
2148 panic("key_spdacquire: policy mismatched. IPsec is expected.\n");
2149
2150 /* Get an entry to check whether sent message or not. */
2151 if ((newspacq = key_getspacq(&sp->spidx)) != NULL) {
2152 if (key_blockacq_count < newspacq->count) {
2153 /* reset counter and do send message. */
2154 newspacq->count = 0;
2155 } else {
2156 /* increment counter and do nothing. */
2157 newspacq->count++;
2158 return 0;
2159 }
2160 } else {
2161 /* make new entry for blocking to send SADB_ACQUIRE. */
2162 if ((newspacq = key_newspacq(&sp->spidx)) == NULL)
2163 return ENOBUFS;
2164
2165 /* add to acqtree */
2166 LIST_INSERT_HEAD(&spacqtree, newspacq, chain);
2167 }
2168
2169 /* create new sadb_msg to reply. */
2170 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2171 if (!m) {
2172 error = ENOBUFS;
2173 goto fail;
2174 }
2175 result = m;
2176 result->m_pkthdr.len = m_lengthm(result, NULL);
2177 mtod(result, struct sadb_msg *)->sadb_msg_len =
2178 PFKEY_UNIT64(result->m_pkthdr.len);
2179
2180 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2181
2182 fail:
2183 if (result)
2184 m_freem(result);
2185 return error;
2186 }
2187
2188 /*
2189 * SADB_SPDFLUSH processing
2190 * receive
2191 * <base>
2192 * from the user, and free all entries in secpctree.
2193 * and send,
2194 * <base>
2195 * to the user.
2196 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2197 *
2198 * m will always be freed.
2199 */
2200 static int
2201 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2202 {
2203 struct sadb_msg *newmsg;
2204 struct secpolicy *sp;
2205 u_int dir;
2206
2207 /* sanity check */
2208 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2209 panic("key_spdflush: NULL pointer is passed.\n");
2210
2211 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2212 return key_senderror(so, m, EINVAL);
2213
2214 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2215 LIST_FOREACH(sp, &sptree[dir], chain) {
2216 sp->state = IPSEC_SPSTATE_DEAD;
2217 }
2218 }
2219
2220 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2221 ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n"));
2222 return key_senderror(so, m, ENOBUFS);
2223 }
2224
2225 if (m->m_next)
2226 m_freem(m->m_next);
2227 m->m_next = NULL;
2228 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2229 newmsg = mtod(m, struct sadb_msg *);
2230 newmsg->sadb_msg_errno = 0;
2231 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2232
2233 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2234 }
2235
2236 /*
2237 * SADB_SPDDUMP processing
2238 * receive
2239 * <base>
2240 * from the user, and dump all SP leaves
2241 * and send,
2242 * <base> .....
2243 * to the ikmpd.
2244 *
2245 * m will always be freed.
2246 */
2247 static int
2248 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2249 {
2250 struct secpolicy *sp;
2251 int cnt;
2252 u_int dir;
2253 struct mbuf *n;
2254
2255 /* sanity check */
2256 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2257 panic("key_spddump: NULL pointer is passed.\n");
2258
2259 /* search SPD entry and get buffer size. */
2260 cnt = 0;
2261 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2262 LIST_FOREACH(sp, &sptree[dir], chain) {
2263 cnt++;
2264 }
2265 }
2266
2267 if (cnt == 0)
2268 return key_senderror(so, m, ENOENT);
2269
2270 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2271 LIST_FOREACH(sp, &sptree[dir], chain) {
2272 --cnt;
2273 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2274 mhp->msg->sadb_msg_pid);
2275
2276 if (n)
2277 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2278 }
2279 }
2280
2281 m_freem(m);
2282 return 0;
2283 }
2284
2285 static struct mbuf *
2286 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
2287 u_int32_t pid)
2288 {
2289 struct mbuf *result = NULL, *m;
2290
2291 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2292 if (!m)
2293 goto fail;
2294 result = m;
2295
2296 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2297 &sp->spidx.src.sa, sp->spidx.prefs,
2298 sp->spidx.ul_proto);
2299 if (!m)
2300 goto fail;
2301 m_cat(result, m);
2302
2303 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2304 &sp->spidx.dst.sa, sp->spidx.prefd,
2305 sp->spidx.ul_proto);
2306 if (!m)
2307 goto fail;
2308 m_cat(result, m);
2309
2310 m = key_sp2msg(sp);
2311 if (!m)
2312 goto fail;
2313 m_cat(result, m);
2314
2315 if ((result->m_flags & M_PKTHDR) == 0)
2316 goto fail;
2317
2318 if (result->m_len < sizeof(struct sadb_msg)) {
2319 result = m_pullup(result, sizeof(struct sadb_msg));
2320 if (result == NULL)
2321 goto fail;
2322 }
2323 result->m_pkthdr.len = m_lengthm(result, NULL);
2324 mtod(result, struct sadb_msg *)->sadb_msg_len =
2325 PFKEY_UNIT64(result->m_pkthdr.len);
2326
2327 return result;
2328
2329 fail:
2330 m_freem(result);
2331 return NULL;
2332 }
2333
2334 /*
2335 * get PFKEY message length for security policy and request.
2336 */
2337 static u_int
2338 key_getspreqmsglen(struct secpolicy *sp)
2339 {
2340 struct ipsecrequest *isr;
2341 u_int tlen, len;
2342
2343 tlen = sizeof(struct sadb_x_policy);
2344
2345 /* if is the policy for ipsec ? */
2346 if (sp->policy != IPSEC_POLICY_IPSEC)
2347 return tlen;
2348
2349 /* get length of ipsec requests */
2350 for (isr = sp->req; isr != NULL; isr = isr->next) {
2351 len = sizeof(struct sadb_x_ipsecrequest) +
2352 isr->saidx.src.sa.sa_len + isr->saidx.dst.sa.sa_len;
2353
2354 tlen += PFKEY_ALIGN8(len);
2355 }
2356
2357 return tlen;
2358 }
2359
2360 /*
2361 * SADB_SPDEXPIRE processing
2362 * send
2363 * <base, address(SD), lifetime(CH), policy>
2364 * to KMD by PF_KEY.
2365 *
2366 * OUT: 0 : succeed
2367 * others : error number
2368 */
2369 static int
2370 key_spdexpire(struct secpolicy *sp)
2371 {
2372
2373 struct mbuf *result = NULL, *m;
2374 int len;
2375 int error = -1;
2376 struct sadb_lifetime *lt;
2377
2378 /* XXX: Why do we lock ? */
2379 crit_enter();
2380
2381 /* sanity check */
2382 if (sp == NULL)
2383 panic("key_spdexpire: NULL pointer is passed.\n");
2384
2385 /* set msg header */
2386 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2387 if (!m) {
2388 error = ENOBUFS;
2389 goto fail;
2390 }
2391 result = m;
2392
2393 /* create lifetime extension (current and hard) */
2394 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2395 m = key_alloc_mbuf(len);
2396 if (!m || m->m_next) { /*XXX*/
2397 if (m)
2398 m_freem(m);
2399 error = ENOBUFS;
2400 goto fail;
2401 }
2402 bzero(mtod(m, caddr_t), len);
2403 lt = mtod(m, struct sadb_lifetime *);
2404 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2405 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2406 lt->sadb_lifetime_allocations = 0;
2407 lt->sadb_lifetime_bytes = 0;
2408 lt->sadb_lifetime_addtime = sp->created;
2409 lt->sadb_lifetime_usetime = sp->lastused;
2410 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2411 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2412 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2413 lt->sadb_lifetime_allocations = 0;
2414 lt->sadb_lifetime_bytes = 0;
2415 lt->sadb_lifetime_addtime = sp->lifetime;
2416 lt->sadb_lifetime_usetime = sp->validtime;
2417 m_cat(result, m);
2418
2419 /* set sadb_address for source */
2420 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2421 &sp->spidx.src.sa,
2422 sp->spidx.prefs, sp->spidx.ul_proto);
2423 if (!m) {
2424 error = ENOBUFS;
2425 goto fail;
2426 }
2427 m_cat(result, m);
2428
2429 /* set sadb_address for destination */
2430 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2431 &sp->spidx.dst.sa,
2432 sp->spidx.prefd, sp->spidx.ul_proto);
2433 if (!m) {
2434 error = ENOBUFS;
2435 goto fail;
2436 }
2437 m_cat(result, m);
2438
2439 /* set secpolicy */
2440 m = key_sp2msg(sp);
2441 if (!m) {
2442 error = ENOBUFS;
2443 goto fail;
2444 }
2445 m_cat(result, m);
2446
2447 if ((result->m_flags & M_PKTHDR) == 0) {
2448 error = EINVAL;
2449 goto fail;
2450 }
2451
2452 if (result->m_len < sizeof(struct sadb_msg)) {
2453 result = m_pullup(result, sizeof(struct sadb_msg));
2454 if (result == NULL) {
2455 error = ENOBUFS;
2456 goto fail;
2457 }
2458 }
2459 result->m_pkthdr.len = m_lengthm(result, NULL);
2460 mtod(result, struct sadb_msg *)->sadb_msg_len =
2461 PFKEY_UNIT64(result->m_pkthdr.len);
2462
2463 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2464
2465 fail:
2466 if (result)
2467 m_freem(result);
2468 crit_exit();
2469 return error;
2470 }
2471
2472 /* %%% SAD management */
2473 /*
2474 * allocating a memory for new SA head, and copy from the values of mhp.
2475 * OUT: NULL : failure due to the lack of memory.
2476 * others : pointer to new SA head.
2477 */
2478 static struct secashead *
2479 key_newsah(struct secasindex *saidx)
2480 {
2481 struct secashead *newsah;
2482
2483 KASSERT(saidx != NULL, ("key_newsaidx: null saidx"));
2484
2485 newsah = kmalloc(sizeof(struct secashead), M_SECA,
2486 M_INTWAIT | M_ZERO | M_NULLOK);
2487 if (newsah != NULL) {
2488 int i;
2489 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++)
2490 LIST_INIT(&newsah->savtree[i]);
2491 newsah->saidx = *saidx;
2492
2493 /* add to saidxtree */
2494 newsah->state = SADB_SASTATE_MATURE;
2495 LIST_INSERT_HEAD(&sahtree, newsah, chain);
2496 }
2497 return(newsah);
2498 }
2499
2500 /*
2501 * Delete SA index and all registered SAs.
2502 */
2503 static void
2504 key_delsah(struct secashead *sah)
2505 {
2506 struct secasvar *sav, *nextsav;
2507 u_int stateidx;
2508 int nzombies = 0;
2509
2510 /* sanity check */
2511 if (sah == NULL)
2512 panic("key_delsah: NULL pointer is passed.\n");
2513
2514 crit_enter();
2515
2516 /* searching all SA registerd in the secindex. */
2517 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any);
2518 stateidx++) {
2519 u_int state = saorder_state_any[stateidx];
2520
2521 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain, nextsav)
2522 if (sav->refcnt == 0) {
2523 /* sanity check */
2524 KEY_CHKSASTATE(state, sav->state, __func__);
2525 KEY_FREESAV(&sav);
2526 } else {
2527 /* give up to delete this SA */
2528 nzombies++;
2529 }
2530 }
2531
2532 /* Delete sah it has are no savs. */
2533 if (nzombies == 0) {
2534 /* remove from tree of SA index */
2535 if (__LIST_CHAINED(sah))
2536 LIST_REMOVE(sah, chain);
2537 if (sah->sa_route.ro_rt) {
2538 RTFREE(sah->sa_route.ro_rt);
2539 sah->sa_route.ro_rt = NULL;
2540 }
2541 KFREE(sah);
2542 }
2543
2544 crit_exit();
2545 return;
2546 }
2547
2548 /*
2549 * allocating a new SA with LARVAL state. key_add() and key_getspi() call,
2550 * and copy the values of mhp into new buffer.
2551 * When SAD message type is GETSPI:
2552 * to set sequence number from acq_seq++,
2553 * to set zero to SPI.
2554 * not to call key_setsava().
2555 * OUT: NULL : fail
2556 * others : pointer to new secasvar.
2557 *
2558 * does not modify mbuf. does not free mbuf on error.
2559 */
2560 static struct secasvar *
2561 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, struct secashead *sah,
2562 int *errp, const char *where, int tag)
2563 {
2564 struct secasvar *newsav;
2565 const struct sadb_sa *xsa;
2566
2567 /* sanity check */
2568 if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL)
2569 panic("key_newsa: NULL pointer is passed.\n");
2570
2571 KMALLOC(newsav, struct secasvar *, sizeof(struct secasvar));
2572 if (newsav == NULL) {
2573 ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n"));
2574 *errp = ENOBUFS;
2575 goto done;
2576 }
2577 bzero((caddr_t)newsav, sizeof(struct secasvar));
2578
2579 switch (mhp->msg->sadb_msg_type) {
2580 case SADB_GETSPI:
2581 newsav->spi = 0;
2582
2583 #ifdef IPSEC_DOSEQCHECK
2584 /* sync sequence number */
2585 if (mhp->msg->sadb_msg_seq == 0)
2586 newsav->seq =
2587 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
2588 else
2589 #endif
2590 newsav->seq = mhp->msg->sadb_msg_seq;
2591 break;
2592
2593 case SADB_ADD:
2594 /* sanity check */
2595 if (mhp->ext[SADB_EXT_SA] == NULL) {
2596 KFREE(newsav), newsav = NULL;
2597 ipseclog((LOG_DEBUG, "key_newsa: invalid message is passed.\n"));
2598 *errp = EINVAL;
2599 goto done;
2600 }
2601 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
2602 newsav->spi = xsa->sadb_sa_spi;
2603 newsav->seq = mhp->msg->sadb_msg_seq;
2604 break;
2605 default:
2606 KFREE(newsav), newsav = NULL;
2607 *errp = EINVAL;
2608 goto done;
2609 }
2610
2611 /* copy sav values */
2612 if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
2613 *errp = key_setsaval(newsav, m, mhp);
2614 if (*errp) {
2615 KFREE(newsav), newsav = NULL;
2616 goto done;
2617 }
2618 }
2619
2620 /* reset created */
2621 newsav->created = time_second;
2622 newsav->pid = mhp->msg->sadb_msg_pid;
2623
2624 /* add to satree */
2625 newsav->sah = sah;
2626 newsav->refcnt = 1;
2627 newsav->state = SADB_SASTATE_LARVAL;
2628 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
2629 secasvar, chain);
2630 done:
2631 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
2632 kprintf("DP key_newsav from %s:%u return SP:%p\n",
2633 where, tag, newsav));
2634
2635 return newsav;
2636 }
2637
2638 /*
2639 * free() SA variable entry.
2640 */
2641 static void
2642 key_delsav(struct secasvar *sav)
2643 {
2644 KASSERT(sav != NULL, ("key_delsav: null sav"));
2645 KASSERT(sav->refcnt == 0,
2646 ("key_delsav: reference count %u > 0", sav->refcnt));
2647
2648 /* remove from SA header */
2649 if (__LIST_CHAINED(sav))
2650 LIST_REMOVE(sav, chain);
2651
2652 /*
2653 * Cleanup xform state. Note that zeroize'ing causes the
2654 * keys to be cleared; otherwise we must do it ourself.
2655 */
2656 if (sav->tdb_xform != NULL) {
2657 sav->tdb_xform->xf_zeroize(sav);
2658 sav->tdb_xform = NULL;
2659 } else {
2660 if (sav->key_auth != NULL)
2661 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
2662 if (sav->key_enc != NULL)
2663 bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
2664 }
2665 if (sav->key_auth != NULL) {
2666 KFREE(sav->key_auth);
2667 sav->key_auth = NULL;
2668 }
2669 if (sav->key_enc != NULL) {
2670 KFREE(sav->key_enc);
2671 sav->key_enc = NULL;
2672 }
2673 if (sav->sched) {
2674 bzero(sav->sched, sav->schedlen);
2675 KFREE(sav->sched);
2676 sav->sched = NULL;
2677 }
2678 if (sav->replay != NULL) {
2679 KFREE(sav->replay);
2680 sav->replay = NULL;
2681 }
2682 if (sav->lft_c != NULL) {
2683 KFREE(sav->lft_c);
2684 sav->lft_c = NULL;
2685 }
2686 if (sav->lft_h != NULL) {
2687 KFREE(sav->lft_h);
2688 sav->lft_h = NULL;
2689 }
2690 if (sav->lft_s != NULL) {
2691 KFREE(sav->lft_s);
2692 sav->lft_s = NULL;
2693 }
2694 if (sav->iv != NULL) {
2695 KFREE(sav->iv);
2696 sav->iv = NULL;
2697 }
2698
2699 KFREE(sav);
2700
2701 return;
2702 }
2703
2704 /*
2705 * search SAD.
2706 * OUT:
2707 * NULL : not found
2708 * others : found, pointer to a SA.
2709 */
2710 static struct secashead *
2711 key_getsah(struct secasindex *saidx)
2712 {
2713 struct secashead *sah;
2714
2715 LIST_FOREACH(sah, &sahtree, chain) {
2716 if (sah->state == SADB_SASTATE_DEAD)
2717 continue;
2718 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID))
2719 return sah;
2720 }
2721
2722 return NULL;
2723 }
2724
2725 /*
2726 * check not to be duplicated SPI.
2727 * NOTE: this function is too slow due to searching all SAD.
2728 * OUT:
2729 * NULL : not found
2730 * others : found, pointer to a SA.
2731 */
2732 static struct secasvar *
2733 key_checkspidup(struct secasindex *saidx, u_int32_t spi)
2734 {
2735 struct secashead *sah;
2736 struct secasvar *sav;
2737
2738 /* check address family */
2739 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) {
2740 ipseclog((LOG_DEBUG, "key_checkspidup: address family mismatched.\n"));
2741 return NULL;
2742 }
2743
2744 /* check all SAD */
2745 LIST_FOREACH(sah, &sahtree, chain) {
2746 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst))
2747 continue;
2748 sav = key_getsavbyspi(sah, spi);
2749 if (sav != NULL)
2750 return sav;
2751 }
2752
2753 return NULL;
2754 }
2755
2756 /*
2757 * search SAD litmited alive SA, protocol, SPI.
2758 * OUT:
2759 * NULL : not found
2760 * others : found, pointer to a SA.
2761 */
2762 static struct secasvar *
2763 key_getsavbyspi(struct secashead *sah, u_int32_t spi)
2764 {
2765 struct secasvar *sav;
2766 u_int stateidx;
2767
2768 /* search all status */
2769 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive);
2770 stateidx++) {
2771 u_int state = saorder_state_alive[stateidx];
2772
2773 LIST_FOREACH(sav, &sah->savtree[state], chain) {
2774 /* sanity check */
2775 if (sav->state != state) {
2776 ipseclog((LOG_DEBUG, "key_getsavbyspi: "
2777 "invalid sav->state (queue: %d SA: %d)\n",
2778 state, sav->state));
2779 continue;
2780 }
2781
2782 if (sav->spi == spi)
2783 return sav;
2784 }
2785 }
2786
2787 return NULL;
2788 }
2789
2790 /*
2791 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*.
2792 * You must update these if need.
2793 * OUT: 0: success.
2794 * !0: failure.
2795 *
2796 * does not modify mbuf. does not free mbuf on error.
2797 */
2798 static int
2799 key_setsaval(struct secasvar *sav, struct mbuf *m,
2800 const struct sadb_msghdr *mhp)
2801 {
2802 int error = 0;
2803
2804 /* sanity check */
2805 if (m == NULL || mhp == NULL || mhp->msg == NULL)
2806 panic("key_setsaval: NULL pointer is passed.\n");
2807
2808 /* initialization */
2809 sav->replay = NULL;
2810 sav->key_auth = NULL;
2811 sav->key_enc = NULL;
2812 sav->sched = NULL;
2813 sav->schedlen = 0;
2814 sav->iv = NULL;
2815 sav->lft_c = NULL;
2816 sav->lft_h = NULL;
2817 sav->lft_s = NULL;
2818 sav->tdb_xform = NULL; /* transform */
2819 sav->tdb_encalgxform = NULL; /* encoding algorithm */
2820 sav->tdb_authalgxform = NULL; /* authentication algorithm */
2821 sav->tdb_compalgxform = NULL; /* compression algorithm */
2822
2823 /* SA */
2824 if (mhp->ext[SADB_EXT_SA] != NULL) {
2825 const struct sadb_sa *sa0;
2826
2827 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
2828 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
2829 error = EINVAL;
2830 goto fail;
2831 }
2832
2833 sav->alg_auth = sa0->sadb_sa_auth;
2834 sav->alg_enc = sa0->sadb_sa_encrypt;
2835 sav->flags = sa0->sadb_sa_flags;
2836
2837 /* replay window */
2838 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
2839 sav->replay =
2840 kmalloc(sizeof(struct secreplay)+sa0->sadb_sa_replay,
2841 M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
2842 if (sav->replay == NULL) {
2843 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2844 error = ENOBUFS;
2845 goto fail;
2846 }
2847 if (sa0->sadb_sa_replay != 0)
2848 sav->replay->bitmap = (caddr_t)(sav->replay+1);
2849 sav->replay->wsize = sa0->sadb_sa_replay;
2850 }
2851 }
2852
2853 /* Authentication keys */
2854 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
2855 const struct sadb_key *key0;
2856 int len;
2857
2858 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
2859 len = mhp->extlen[SADB_EXT_KEY_AUTH];
2860
2861 error = 0;
2862 if (len < sizeof(*key0)) {
2863 error = EINVAL;
2864 goto fail;
2865 }
2866 switch (mhp->msg->sadb_msg_satype) {
2867 case SADB_SATYPE_AH:
2868 case SADB_SATYPE_ESP:
2869 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
2870 sav->alg_auth != SADB_X_AALG_NULL)
2871 error = EINVAL;
2872 break;
2873 case SADB_X_SATYPE_IPCOMP:
2874 default:
2875 error = EINVAL;
2876 break;
2877 }
2878 if (error) {
2879 ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth values.\n"));
2880 goto fail;
2881 }
2882
2883 sav->key_auth = (struct sadb_key *)key_newbuf(key0, len);
2884 if (sav->key_auth == NULL) {
2885 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2886 error = ENOBUFS;
2887 goto fail;
2888 }
2889 }
2890
2891 /* Encryption key */
2892 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
2893 const struct sadb_key *key0;
2894 int len;
2895
2896 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
2897 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
2898
2899 error = 0;
2900 if (len < sizeof(*key0)) {
2901 error = EINVAL;
2902 goto fail;
2903 }
2904 switch (mhp->msg->sadb_msg_satype) {
2905 case SADB_SATYPE_ESP:
2906 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
2907 sav->alg_enc != SADB_EALG_NULL) {
2908 error = EINVAL;
2909 break;
2910 }
2911 sav->key_enc = (struct sadb_key *)key_newbuf(key0, len);
2912 if (sav->key_enc == NULL) {
2913 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2914 error = ENOBUFS;
2915 goto fail;
2916 }
2917 break;
2918 case SADB_X_SATYPE_IPCOMP:
2919 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
2920 error = EINVAL;
2921 sav->key_enc = NULL; /*just in case*/
2922 break;
2923 case SADB_SATYPE_AH:
2924 default:
2925 error = EINVAL;
2926 break;
2927 }
2928 if (error) {
2929 ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc value.\n"));
2930 goto fail;
2931 }
2932 }
2933
2934 /* set iv */
2935 sav->ivlen = 0;
2936
2937 switch (mhp->msg->sadb_msg_satype) {
2938 case SADB_SATYPE_AH:
2939 error = xform_init(sav, XF_AH);
2940 break;
2941 case SADB_SATYPE_ESP:
2942 error = xform_init(sav, XF_ESP);
2943 break;
2944 case SADB_X_SATYPE_IPCOMP:
2945 error = xform_init(sav, XF_IPCOMP);
2946 break;
2947 }
2948 if (error) {
2949 ipseclog((LOG_DEBUG,
2950 "key_setsaval: unable to initialize SA type %u.\n",
2951 mhp->msg->sadb_msg_satype));
2952 goto fail;
2953 }
2954
2955 /* reset created */
2956 sav->created = time_second;
2957
2958 /* make lifetime for CURRENT */
2959 KMALLOC(sav->lft_c, struct sadb_lifetime *,
2960 sizeof(struct sadb_lifetime));
2961 if (sav->lft_c == NULL) {
2962 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2963 error = ENOBUFS;
2964 goto fail;
2965 }
2966
2967 sav->lft_c->sadb_lifetime_len =
2968 PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2969 sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2970 sav->lft_c->sadb_lifetime_allocations = 0;
2971 sav->lft_c->sadb_lifetime_bytes = 0;
2972 sav->lft_c->sadb_lifetime_addtime = time_second;
2973 sav->lft_c->sadb_lifetime_usetime = 0;
2974
2975 /* lifetimes for HARD and SOFT */
2976 {
2977 const struct sadb_lifetime *lft0;
2978
2979 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
2980 if (lft0 != NULL) {
2981 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
2982 error = EINVAL;
2983 goto fail;
2984 }
2985 sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0,
2986 sizeof(*lft0));
2987 if (sav->lft_h == NULL) {
2988 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2989 error = ENOBUFS;
2990 goto fail;
2991 }
2992 /* to be initialize ? */
2993 }
2994
2995 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
2996 if (lft0 != NULL) {
2997 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
2998 error = EINVAL;
2999 goto fail;
3000 }
3001 sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0,
3002 sizeof(*lft0));
3003 if (sav->lft_s == NULL) {
3004 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
3005 error = ENOBUFS;
3006 goto fail;
3007 }
3008 /* to be initialize ? */
3009 }
3010 }
3011
3012 return 0;
3013
3014 fail:
3015 /* initialization */
3016 if (sav->replay != NULL) {
3017 KFREE(sav->replay);
3018 sav->replay = NULL;
3019 }
3020 if (sav->key_auth != NULL) {
3021 KFREE(sav->key_auth);
3022 sav->key_auth = NULL;
3023 }
3024 if (sav->key_enc != NULL) {
3025 KFREE(sav->key_enc);
3026 sav->key_enc = NULL;
3027 }
3028 if (sav->sched) {
3029 KFREE(sav->sched);
3030 sav->sched = NULL;
3031 }
3032 if (sav->iv != NULL) {
3033 KFREE(sav->iv);
3034 sav->iv = NULL;
3035 }
3036 if (sav->lft_c != NULL) {
3037 KFREE(sav->lft_c);
3038 sav->lft_c = NULL;
3039 }
3040 if (sav->lft_h != NULL) {
3041 KFREE(sav->lft_h);
3042 sav->lft_h = NULL;
3043 }
3044 if (sav->lft_s != NULL) {
3045 KFREE(sav->lft_s);
3046 sav->lft_s = NULL;
3047 }
3048
3049 return error;
3050 }
3051
3052 /*
3053 * validation with a secasvar entry, and set SADB_SATYPE_MATURE.
3054 * OUT: 0: valid
3055 * other: errno
3056 */
3057 static int
3058 key_mature(struct secasvar *sav)
3059 {
3060 int error;
3061
3062 /* check SPI value */
3063 switch (sav->sah->saidx.proto) {
3064 case IPPROTO_ESP:
3065 case IPPROTO_AH:
3066 if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) {
3067 ipseclog((LOG_DEBUG,
3068 "key_mature: illegal range of SPI %u.\n",
3069 (u_int32_t)ntohl(sav->spi)));
3070 return EINVAL;
3071 }
3072 break;
3073 }
3074
3075 /* check satype */
3076 switch (sav->sah->saidx.proto) {
3077 case IPPROTO_ESP:
3078 /* check flags */
3079 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) ==
3080 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) {
3081 ipseclog((LOG_DEBUG, "key_mature: "
3082 "invalid flag (derived) given to old-esp.\n"));
3083 return EINVAL;
3084 }
3085 error = xform_init(sav, XF_ESP);
3086 break;
3087 case IPPROTO_AH:
3088 /* check flags */
3089 if (sav->flags & SADB_X_EXT_DERIV) {
3090 ipseclog((LOG_DEBUG, "key_mature: "
3091 "invalid flag (derived) given to AH SA.\n"));
3092 return EINVAL;
3093 }
3094 if (sav->alg_enc != SADB_EALG_NONE) {
3095 ipseclog((LOG_DEBUG, "key_mature: "
3096 "protocol and algorithm mismated.\n"));
3097 return(EINVAL);
3098 }
3099 error = xform_init(sav, XF_AH);
3100 break;
3101 case IPPROTO_IPCOMP:
3102 if (sav->alg_auth != SADB_AALG_NONE) {
3103 ipseclog((LOG_DEBUG, "key_mature: "
3104 "protocol and algorithm mismated.\n"));
3105 return(EINVAL);
3106 }
3107 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0
3108 && ntohl(sav->spi) >= 0x10000) {
3109 ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n"));
3110 return(EINVAL);
3111 }
3112 error = xform_init(sav, XF_IPCOMP);
3113 break;
3114 default:
3115 ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n"));
3116 error = EPROTONOSUPPORT;
3117 break;
3118 }
3119 if (error == 0)
3120 key_sa_chgstate(sav, SADB_SASTATE_MATURE);
3121 return (error);
3122 }
3123
3124 /*
3125 * subroutine for SADB_GET and SADB_DUMP.
3126 */
3127 static struct mbuf *
3128 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype,
3129 u_int32_t seq, u_int32_t pid)
3130 {
3131 struct mbuf *result = NULL, *tres = NULL, *m;
3132 int l = 0;
3133 int i;
3134 void *p;
3135 int dumporder[] = {
3136 SADB_EXT_SA, SADB_X_EXT_SA2,
3137 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3138 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3139 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
3140 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
3141 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
3142 };
3143
3144 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3145 if (m == NULL)
3146 goto fail;
3147 result = m;
3148
3149 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) {
3150 m = NULL;
3151 p = NULL;
3152 switch (dumporder[i]) {
3153 case SADB_EXT_SA:
3154 m = key_setsadbsa(sav);
3155 if (!m)
3156 goto fail;
3157 break;
3158
3159 case SADB_X_EXT_SA2:
3160 m = key_setsadbxsa2(sav->sah->saidx.mode,
3161 sav->replay ? sav->replay->count : 0,
3162 sav->sah->saidx.reqid);
3163 if (!m)
3164 goto fail;
3165 break;
3166
3167 case SADB_EXT_ADDRESS_SRC:
3168 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3169 &sav->sah->saidx.src.sa,
3170 FULLMASK, IPSEC_ULPROTO_ANY);
3171 if (!m)
3172 goto fail;
3173 break;
3174
3175 case SADB_EXT_ADDRESS_DST:
3176 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3177 &sav->sah->saidx.dst.sa,
3178 FULLMASK, IPSEC_ULPROTO_ANY);
3179 if (!m)
3180 goto fail;
3181 break;
3182
3183 case SADB_EXT_KEY_AUTH:
3184 if (!sav->key_auth)
3185 continue;
3186 l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len);
3187 p = sav->key_auth;
3188 break;
3189
3190 case SADB_EXT_KEY_ENCRYPT:
3191 if (!sav->key_enc)
3192 continue;
3193 l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len);
3194 p = sav->key_enc;
3195 break;
3196
3197 case SADB_EXT_LIFETIME_CURRENT:
3198 if (!sav->lft_c)
3199 continue;
3200 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len);
3201 p = sav->lft_c;
3202 break;
3203
3204 case SADB_EXT_LIFETIME_HARD:
3205 if (!sav->lft_h)
3206 continue;
3207 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len);
3208 p = sav->lft_h;
3209 break;
3210
3211 case SADB_EXT_LIFETIME_SOFT:
3212 if (!sav->lft_s)
3213 continue;
3214 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len);
3215 p = sav->lft_s;
3216 break;
3217
3218 case SADB_EXT_ADDRESS_PROXY:
3219 case SADB_EXT_IDENTITY_SRC:
3220 case SADB_EXT_IDENTITY_DST:
3221 /* XXX: should we brought from SPD ? */
3222 case SADB_EXT_SENSITIVITY:
3223 default:
3224 continue;
3225 }
3226
3227 if ((!m && !p) || (m && p))
3228 goto fail;
3229 if (p && tres) {
3230 M_PREPEND(tres, l, MB_DONTWAIT);
3231 if (!tres)
3232 goto fail;
3233 bcopy(p, mtod(tres, caddr_t), l);
3234 continue;
3235 }
3236 if (p) {
3237 m = key_alloc_mbuf(l);
3238 if (!m)
3239 goto fail;
3240 m_copyback(m, 0, l, p);
3241 }
3242
3243 if (tres)
3244 m_cat(m, tres);
3245 tres = m;
3246 }
3247
3248 m_cat(result, tres);
3249
3250 if (result->m_len < sizeof(struct sadb_msg)) {
3251 result = m_pullup(result, sizeof(struct sadb_msg));
3252 if (result == NULL)
3253 goto fail;
3254 }
3255 result->m_pkthdr.len = m_lengthm(result, NULL);
3256 mtod(result, struct sadb_msg *)->sadb_msg_len =
3257 PFKEY_UNIT64(result->m_pkthdr.len);
3258
3259 return result;
3260
3261 fail:
3262 m_freem(result);
3263 m_freem(tres);
3264 return NULL;
3265 }
3266
3267 /*
3268 * set data into sadb_msg.
3269 */
3270 static struct mbuf *
3271 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3272 pid_t pid, u_int16_t reserved)
3273 {
3274 struct mbuf *m;
3275 struct sadb_msg *p;
3276 int len;
3277
3278 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3279 if (len > MCLBYTES)
3280 return NULL;
3281 m = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
3282 if (!m)
3283 return NULL;
3284 m->m_pkthdr.len = m->m_len = len;
3285
3286 p = mtod(m, struct sadb_msg *);
3287
3288 bzero(p, len);
3289 p->sadb_msg_version = PF_KEY_V2;
3290 p->sadb_msg_type = type;
3291 p->sadb_msg_errno = 0;
3292 p->sadb_msg_satype = satype;
3293 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3294 p->sadb_msg_reserved = reserved;
3295 p->sadb_msg_seq = seq;
3296 p->sadb_msg_pid = (u_int32_t)pid;
3297
3298 return m;
3299 }
3300
3301 /*
3302 * copy secasvar data into sadb_address.
3303 */
3304 static struct mbuf *
3305 key_setsadbsa(struct secasvar *sav)
3306 {
3307 struct mbuf *m;
3308 struct sadb_sa *p;
3309 int len;
3310
3311 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3312 m = key_alloc_mbuf(len);
3313 if (!m || m->m_next) { /*XXX*/
3314 if (m)
3315 m_freem(m);
3316 return NULL;
3317 }
3318
3319 p = mtod(m, struct sadb_sa *);
3320
3321 bzero(p, len);
3322 p->sadb_sa_len = PFKEY_UNIT64(len);
3323 p->sadb_sa_exttype = SADB_EXT_SA;
3324 p->sadb_sa_spi = sav->spi;
3325 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
3326 p->sadb_sa_state = sav->state;
3327 p->sadb_sa_auth = sav->alg_auth;
3328 p->sadb_sa_encrypt = sav->alg_enc;
3329 p->sadb_sa_flags = sav->flags;
3330
3331 return m;
3332 }
3333
3334 /*
3335 * set data into sadb_address.
3336 */
3337 static struct mbuf *
3338 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen,
3339 u_int16_t ul_proto)
3340 {
3341 struct mbuf *m;
3342 struct sadb_address *p;
3343 size_t len;
3344
3345 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3346 PFKEY_ALIGN8(saddr->sa_len);
3347 m = key_alloc_mbuf(len);
3348 if (!m || m->m_next) { /*XXX*/
3349 if (m)
3350 m_freem(m);
3351 return NULL;
3352 }
3353
3354 p = mtod(m, struct sadb_address *);
3355
3356 bzero(p, len);
3357 p->sadb_address_len = PFKEY_UNIT64(len);
3358 p->sadb_address_exttype = exttype;
3359 p->sadb_address_proto = ul_proto;
3360 if (prefixlen == FULLMASK) {
3361 switch (saddr->sa_family) {
3362 case AF_INET:
3363 prefixlen = sizeof(struct in_addr) << 3;
3364 break;
3365 case AF_INET6:
3366 prefixlen = sizeof(struct in6_addr) << 3;
3367 break;
3368 default:
3369 ; /*XXX*/
3370 }
3371 }
3372 p->sadb_address_prefixlen = prefixlen;
3373 p->sadb_address_reserved = 0;
3374
3375 bcopy(saddr,
3376 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3377 saddr->sa_len);
3378
3379 return m;
3380 }
3381
3382 #if 0
3383 /*
3384 * set data into sadb_ident.
3385 */
3386 static struct mbuf *
3387 key_setsadbident(u_int16_t exttype, u_int16_t idtype, caddr_t string,
3388 int stringlen, u_int64_t id)
3389 {
3390 struct mbuf *m;
3391 struct sadb_ident *p;
3392 size_t len;
3393
3394 len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen);
3395 m = key_alloc_mbuf(len);
3396 if (!m || m->m_next) { /*XXX*/
3397 if (m)
3398 m_freem(m);
3399 return NULL;
3400 }
3401
3402 p = mtod(m, struct sadb_ident *);
3403
3404 bzero(p, len);
3405 p->sadb_ident_len = PFKEY_UNIT64(len);
3406 p->sadb_ident_exttype = exttype;
3407 p->sadb_ident_type = idtype;
3408 p->sadb_ident_reserved = 0;
3409 p->sadb_ident_id = id;
3410
3411 bcopy(string,
3412 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_ident)),
3413 stringlen);
3414
3415 return m;
3416 }
3417 #endif
3418
3419 /*
3420 * set data into sadb_x_sa2.
3421 */
3422 static struct mbuf *
3423 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3424 {
3425 struct mbuf *m;
3426 struct sadb_x_sa2 *p;
3427 size_t len;
3428
3429 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3430 m = key_alloc_mbuf(len);
3431 if (!m || m->m_next) { /*XXX*/
3432 if (m)
3433 m_freem(m);
3434 return NULL;
3435 }
3436
3437 p = mtod(m, struct sadb_x_sa2 *);
3438
3439 bzero(p, len);
3440 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3441 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3442 p->sadb_x_sa2_mode = mode;
3443 p->sadb_x_sa2_reserved1 = 0;
3444 p->sadb_x_sa2_reserved2 = 0;
3445 p->sadb_x_sa2_sequence = seq;
3446 p->sadb_x_sa2_reqid = reqid;
3447
3448 return m;
3449 }
3450
3451 /*
3452 * set data into sadb_x_policy
3453 */
3454 static struct mbuf *
3455 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id)
3456 {
3457 struct mbuf *m;
3458 struct sadb_x_policy *p;
3459 size_t len;
3460
3461 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
3462 m = key_alloc_mbuf(len);
3463 if (!m || m->m_next) { /*XXX*/
3464 if (m)
3465 m_freem(m);
3466 return NULL;
3467 }
3468
3469 p = mtod(m, struct sadb_x_policy *);
3470
3471 bzero(p, len);
3472 p->sadb_x_policy_len = PFKEY_UNIT64(len);
3473 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3474 p->sadb_x_policy_type = type;
3475 p->sadb_x_policy_dir = dir;
3476 p->sadb_x_policy_id = id;
3477
3478 return m;
3479 }
3480
3481 /* %%% utilities */
3482 /*
3483 * copy a buffer into the new buffer allocated.
3484 */
3485 static void *
3486 key_newbuf(const void *src, u_int len)
3487 {
3488 caddr_t new;
3489
3490 KMALLOC(new, caddr_t, len);
3491 if (new == NULL) {
3492 ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n"));
3493 return NULL;
3494 }
3495 bcopy(src, new, len);
3496
3497 return new;
3498 }
3499
3500 /* compare my own address
3501 * OUT: 1: true, i.e. my address.
3502 * 0: false
3503 */
3504 int
3505 key_ismyaddr(struct sockaddr *sa)
3506 {
3507 #ifdef INET
3508 struct sockaddr_in *sin;
3509 struct in_ifaddr_container *iac;
3510 #endif
3511
3512 /* sanity check */
3513 if (sa == NULL)
3514 panic("key_ismyaddr: NULL pointer is passed.\n");
3515
3516 switch (sa->sa_family) {
3517 #ifdef INET
3518 case AF_INET:
3519 sin = (struct sockaddr_in *)sa;
3520 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3521 struct in_ifaddr *ia = iac->ia;
3522
3523 if (sin->sin_family == ia->ia_addr.sin_family &&
3524 sin->sin_len == ia->ia_addr.sin_len &&
3525 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
3526 {
3527 return 1;
3528 }
3529 }
3530 break;
3531 #endif
3532 #ifdef INET6
3533 case AF_INET6:
3534 return key_ismyaddr6((struct sockaddr_in6 *)sa);
3535 #endif
3536 }
3537
3538 return 0;
3539 }
3540
3541 #ifdef INET6
3542 /*
3543 * compare my own address for IPv6.
3544 * 1: ours
3545 * 0: other
3546 * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
3547 */
3548 #include <netinet6/in6_var.h>
3549
3550 static int
3551 key_ismyaddr6(struct sockaddr_in6 *sin6)
3552 {
3553 struct in6_ifaddr *ia;
3554 struct in6_multi *in6m;
3555
3556 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
3557 if (key_sockaddrcmp((struct sockaddr *)&sin6,
3558 (struct sockaddr *)&ia->ia_addr, 0) == 0)
3559 return 1;
3560
3561 /*
3562 * XXX Multicast
3563 * XXX why do we care about multlicast here while we don't care
3564 * about IPv4 multicast??
3565 * XXX scope
3566 */
3567 in6m = NULL;
3568 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
3569 if (in6m)
3570 return 1;
3571 }
3572
3573 /* loopback, just for safety */
3574 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
3575 return 1;
3576
3577 return 0;
3578 }
3579 #endif /*INET6*/
3580
3581 /*
3582 * compare two secasindex structure.
3583 * flag can specify to compare 2 saidxes.
3584 * compare two secasindex structure without both mode and reqid.
3585 * don't compare port.
3586 * IN:
3587 * saidx0: source, it can be in SAD.
3588 * saidx1: object.
3589 * OUT:
3590 * 1 : equal
3591 * 0 : not equal
3592 */
3593 static int
3594 key_cmpsaidx(
3595 const struct secasindex *saidx0,
3596 const struct secasindex *saidx1,
3597 int flag)
3598 {
3599 /* sanity */
3600 if (saidx0 == NULL && saidx1 == NULL)
3601 return 1;
3602
3603 if (saidx0 == NULL || saidx1 == NULL)
3604 return 0;
3605
3606 if (saidx0->proto != saidx1->proto)
3607 return 0;
3608
3609 if (flag == CMP_EXACTLY) {
3610 if (saidx0->mode != saidx1->mode)
3611 return 0;
3612 if (saidx0->reqid != saidx1->reqid)
3613 return 0;
3614 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 ||
3615 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0)
3616 return 0;
3617 } else {
3618
3619 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
3620 if (flag == CMP_MODE_REQID
3621 ||flag == CMP_REQID) {
3622 /*
3623 * If reqid of SPD is non-zero, unique SA is required.
3624 * The result must be of same reqid in this case.
3625 */
3626 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
3627 return 0;
3628 }
3629
3630 if (flag == CMP_MODE_REQID) {
3631 if (saidx0->mode != IPSEC_MODE_ANY
3632 && saidx0->mode != saidx1->mode)
3633 return 0;
3634 }
3635
3636 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) {
3637 return 0;
3638 }
3639 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) {
3640 return 0;
3641 }
3642 }
3643
3644 return 1;
3645 }
3646
3647 /*
3648 * compare two secindex structure exactly.
3649 * IN:
3650 * spidx0: source, it is often in SPD.
3651 * spidx1: object, it is often from PFKEY message.
3652 * OUT:
3653 * 1 : equal
3654 * 0 : not equal
3655 */
3656 static int
3657 key_cmpspidx_exactly(
3658 struct secpolicyindex *spidx0,
3659 struct secpolicyindex *spidx1)
3660 {
3661 /* sanity */
3662 if (spidx0 == NULL && spidx1 == NULL)
3663 return 1;
3664
3665 if (spidx0 == NULL || spidx1 == NULL)
3666 return 0;
3667
3668 if (spidx0->prefs != spidx1->prefs
3669 || spidx0->prefd != spidx1->prefd
3670 || spidx0->ul_proto != spidx1->ul_proto)
3671 return 0;
3672
3673 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
3674 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
3675 }
3676
3677 /*
3678 * compare two secindex structure with mask.
3679 * IN:
3680 * spidx0: source, it is often in SPD.
3681 * spidx1: object, it is often from IP header.
3682 * OUT:
3683 * 1 : equal
3684 * 0 : not equal
3685 */
3686 static int
3687 key_cmpspidx_withmask(
3688 struct secpolicyindex *spidx0,
3689 struct secpolicyindex *spidx1)
3690 {
3691 /* sanity */
3692 if (spidx0 == NULL && spidx1 == NULL)
3693 return 1;
3694
3695 if (spidx0 == NULL || spidx1 == NULL)
3696 return 0;
3697
3698 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
3699 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
3700 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
3701 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
3702 return 0;
3703
3704 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
3705 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
3706 && spidx0->ul_proto != spidx1->ul_proto)
3707 return 0;
3708
3709 switch (spidx0->src.sa.sa_family) {
3710 case AF_INET:
3711 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
3712 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
3713 return 0;
3714 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
3715 &spidx1->src.sin.sin_addr, spidx0->prefs))
3716 return 0;
3717 break;
3718 case AF_INET6:
3719 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
3720 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
3721 return 0;
3722 /*
3723 * scope_id check. if sin6_scope_id is 0, we regard it
3724 * as a wildcard scope, which matches any scope zone ID.
3725 */
3726 if (spidx0->src.sin6.sin6_scope_id &&
3727 spidx1->src.sin6.sin6_scope_id &&
3728 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
3729 return 0;
3730 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
3731 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
3732 return 0;
3733 break;
3734 default:
3735 /* XXX */
3736 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
3737 return 0;
3738 break;
3739 }
3740
3741 switch (spidx0->dst.sa.sa_family) {
3742 case AF_INET:
3743 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
3744 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
3745 return 0;
3746 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
3747 &spidx1->dst.sin.sin_addr, spidx0->prefd))
3748 return 0;
3749 break;
3750 case AF_INET6:
3751 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
3752 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
3753 return 0;
3754 /*
3755 * scope_id check. if sin6_scope_id is 0, we regard it
3756 * as a wildcard scope, which matches any scope zone ID.
3757 */
3758 if (spidx0->dst.sin6.sin6_scope_id &&
3759 spidx1->dst.sin6.sin6_scope_id &&
3760 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
3761 return 0;
3762 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
3763 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
3764 return 0;
3765 break;
3766 default:
3767 /* XXX */
3768 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
3769 return 0;
3770 break;
3771 }
3772
3773 /* XXX Do we check other field ? e.g. flowinfo */
3774
3775 return 1;
3776 }
3777
3778 /* returns 0 on match */
3779 static int
3780 key_sockaddrcmp(
3781 const struct sockaddr *sa1,
3782 const struct sockaddr *sa2,
3783 int port)
3784 {
3785 #ifdef satosin
3786 #undef satosin
3787 #endif
3788 #define satosin(s) ((const struct sockaddr_in *)s)
3789 #ifdef satosin6
3790 #undef satosin6
3791 #endif
3792 #define satosin6(s) ((const struct sockaddr_in6 *)s)
3793 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
3794 return 1;
3795
3796 switch (sa1->sa_family) {
3797 case AF_INET:
3798 if (sa1->sa_len != sizeof(struct sockaddr_in))
3799 return 1;
3800 if (satosin(sa1)->sin_addr.s_addr !=
3801 satosin(sa2)->sin_addr.s_addr) {
3802 return 1;
3803 }
3804 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
3805 return 1;
3806 break;
3807 case AF_INET6:
3808 if (sa1->sa_len != sizeof(struct sockaddr_in6))
3809 return 1; /*EINVAL*/
3810 if (satosin6(sa1)->sin6_scope_id !=
3811 satosin6(sa2)->sin6_scope_id) {
3812 return 1;
3813 }
3814 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
3815 &satosin6(sa2)->sin6_addr)) {
3816 return 1;
3817 }
3818 if (port &&
3819 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
3820 return 1;
3821 }
3822 default:
3823 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
3824 return 1;
3825 break;
3826 }
3827
3828 return 0;
3829 #undef satosin
3830 #undef satosin6
3831 }
3832
3833 /*
3834 * compare two buffers with mask.
3835 * IN:
3836 * addr1: source
3837 * addr2: object
3838 * bits: Number of bits to compare
3839 * OUT:
3840 * 1 : equal
3841 * 0 : not equal
3842 */
3843 static int
3844 key_bbcmp(const void *a1, const void *a2, u_int bits)
3845 {
3846 const unsigned char *p1 = a1;
3847 const unsigned char *p2 = a2;
3848
3849 /* XXX: This could be considerably faster if we compare a word
3850 * at a time, but it is complicated on LSB Endian machines */
3851
3852 /* Handle null pointers */
3853 if (p1 == NULL || p2 == NULL)
3854 return (p1 == p2);
3855
3856 while (bits >= 8) {
3857 if (*p1++ != *p2++)
3858 return 0;
3859 bits -= 8;
3860 }
3861
3862 if (bits > 0) {
3863 u_int8_t mask = ~((1<<(8-bits))-1);
3864 if ((*p1 & mask) != (*p2 & mask))
3865 return 0;
3866 }
3867 return 1; /* Match! */
3868 }
3869
3870 /*
3871 * time handler.
3872 * scanning SPD and SAD to check status for each entries,
3873 * and do to remove or to expire.
3874 * XXX: year 2038 problem may remain.
3875 */
3876 void
3877 key_timehandler(void *unused)
3878 {
3879 u_int dir;
3880 time_t now = time_second;
3881 struct secspacq *spacq, *nextspacq;
3882
3883 crit_enter();
3884
3885 /* SPD */
3886 {
3887 struct secpolicy *sp, *nextsp;
3888
3889 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
3890 LIST_FOREACH_MUTABLE(sp, &sptree[dir], chain, nextsp) {
3891 if (sp->state == IPSEC_SPSTATE_DEAD) {
3892 KEY_FREESP(&sp);
3893 continue;
3894 }
3895
3896 if (sp->lifetime == 0 && sp->validtime == 0)
3897 continue;
3898
3899 /* the deletion will occur next time */
3900 if ((sp->lifetime && now - sp->created > sp->lifetime)
3901 || (sp->validtime && now - sp->lastused > sp->validtime)) {
3902 sp->state = IPSEC_SPSTATE_DEAD;
3903 key_spdexpire(sp);
3904 continue;
3905 }
3906 }
3907 }
3908 }
3909
3910 /* SAD */
3911 {
3912 struct secashead *sah, *nextsah;
3913 struct secasvar *sav, *nextsav;
3914
3915 LIST_FOREACH_MUTABLE(sah, &sahtree, chain, nextsah) {
3916 /* if sah has been dead, then delete it and process next sah. */
3917 if (sah->state == SADB_SASTATE_DEAD) {
3918 key_delsah(sah);
3919 continue;
3920 }
3921
3922 /* if LARVAL entry doesn't become MATURE, delete it. */
3923 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_LARVAL],
3924 chain, nextsav) {
3925 if (now - sav->created > key_larval_lifetime) {
3926 KEY_FREESAV(&sav);
3927 }
3928 }
3929
3930 /*
3931 * check MATURE entry to start to send expire message
3932 * whether or not.
3933 */
3934 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_MATURE],
3935 chain, nextsav) {
3936 /* we don't need to check. */
3937 if (sav->lft_s == NULL)
3938 continue;
3939
3940 /* sanity check */
3941 if (sav->lft_c == NULL) {
3942 ipseclog((LOG_DEBUG,"key_timehandler: "
3943 "There is no CURRENT time, why?\n"));
3944 continue;
3945 }
3946
3947 /* check SOFT lifetime */
3948 if (sav->lft_s->sadb_lifetime_addtime != 0
3949 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) {
3950 /*
3951 * check SA to be used whether or not.
3952 * when SA hasn't been used, delete it.
3953 */
3954 if (sav->lft_c->sadb_lifetime_usetime == 0) {
3955 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
3956 KEY_FREESAV(&sav);
3957 } else {
3958 key_sa_chgstate(sav, SADB_SASTATE_DYING);
3959 /*
3960 * XXX If we keep to send expire
3961 * message in the status of
3962 * DYING. Do remove below code.
3963 */
3964 key_expire(sav);
3965 }
3966 }
3967 /* check SOFT lifetime by bytes */
3968 /*
3969 * XXX I don't know the way to delete this SA
3970 * when new SA is installed. Caution when it's
3971 * installed too big lifetime by time.
3972 */
3973 else if (sav->lft_s->sadb_lifetime_bytes != 0
3974 && sav->lft_s->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
3975
3976 key_sa_chgstate(sav, SADB_SASTATE_DYING);
3977 /*
3978 * XXX If we keep to send expire
3979 * message in the status of
3980 * DYING. Do remove below code.
3981 */
3982 key_expire(sav);
3983 }
3984 }
3985
3986 /* check DYING entry to change status to DEAD. */
3987 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_DYING],
3988 chain, nextsav) {
3989 /* we don't need to check. */
3990 if (sav->lft_h == NULL)
3991 continue;
3992
3993 /* sanity check */
3994 if (sav->lft_c == NULL) {
3995 ipseclog((LOG_DEBUG, "key_timehandler: "
3996 "There is no CURRENT time, why?\n"));
3997 continue;
3998 }
3999
4000 if (sav->lft_h->sadb_lifetime_addtime != 0
4001 && now - sav->created > sav->lft_h->sadb_lifetime_addtime) {
4002 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4003 KEY_FREESAV(&sav);
4004 }
4005 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */
4006 else if (sav->lft_s != NULL
4007 && sav->lft_s->sadb_lifetime_addtime != 0
4008 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) {
4009 /*
4010 * XXX: should be checked to be
4011 * installed the valid SA.
4012 */
4013
4014 /*
4015 * If there is no SA then sending
4016 * expire message.
4017 */
4018 key_expire(sav);
4019 }
4020 #endif
4021 /* check HARD lifetime by bytes */
4022 else if (sav->lft_h->sadb_lifetime_bytes != 0
4023 && sav->lft_h->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
4024 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4025 KEY_FREESAV(&sav);
4026 }
4027 }
4028
4029 /* delete entry in DEAD */
4030 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_DEAD],
4031 chain, nextsav) {
4032 /* sanity check */
4033 if (sav->state != SADB_SASTATE_DEAD) {
4034 ipseclog((LOG_DEBUG, "key_timehandler: "
4035 "invalid sav->state "
4036 "(queue: %d SA: %d): "
4037 "kill it anyway\n",
4038 SADB_SASTATE_DEAD, sav->state));
4039 }
4040
4041 /*
4042 * do not call key_freesav() here.
4043 * sav should already be freed, and sav->refcnt
4044 * shows other references to sav
4045 * (such as from SPD).
4046 */
4047 }
4048 }
4049 }
4050
4051 #ifndef IPSEC_NONBLOCK_ACQUIRE
4052 /* ACQ tree */
4053 {
4054 struct secacq *acq, *nextacq;
4055
4056 LIST_FOREACH_MUTABLE(acq, &acqtree, chain, nextacq) {
4057 if (now - acq->created > key_blockacq_lifetime &&
4058 __LIST_CHAINED(acq)) {
4059 LIST_REMOVE(acq, chain);
4060 KFREE(acq);
4061 }
4062 }
4063 }
4064 #endif
4065
4066 /* SP ACQ tree */
4067 LIST_FOREACH_MUTABLE(spacq, &spacqtree, chain, nextspacq) {
4068 if (now - spacq->created > key_blockacq_lifetime &&
4069 __LIST_CHAINED(spacq)) {
4070 LIST_REMOVE(spacq, chain);
4071 KFREE(spacq);
4072 }
4073 }
4074
4075 /* initialize random seed */
4076 if (key_tick_init_random++ > key_int_random) {
4077 key_tick_init_random = 0;
4078 key_srandom();
4079 }
4080
4081 #ifndef IPSEC_DEBUG2
4082 /* do exchange to tick time !! */
4083 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL);
4084 #endif
4085
4086 crit_exit();
4087 return;
4088 }
4089
4090 /*
4091 * to initialize a seed for random()
4092 */
4093 static void
4094 key_srandom(void)
4095 {
4096 skrandom(time_second);
4097 }
4098
4099 u_long
4100 key_random(void)
4101 {
4102 u_long value;
4103
4104 key_randomfill(&value, sizeof(value));
4105 return value;
4106 }
4107
4108 void
4109 key_randomfill(void *p, size_t l)
4110 {
4111 size_t n;
4112 u_long v;
4113 static int warn = 1;
4114
4115 n = (size_t)read_random(p, (u_int)l);
4116 /* last resort */
4117 while (n < l) {
4118 v = krandom();
4119 bcopy(&v, (u_int8_t *)p + n,
4120 l - n < sizeof(v) ? l - n : sizeof(v));
4121 n += sizeof(v);
4122
4123 if (warn) {
4124 kprintf("WARNING: pseudo-random number generator "
4125 "used for IPsec processing\n");
4126 warn = 0;
4127 }
4128 }
4129 }
4130
4131 /*
4132 * map SADB_SATYPE_* to IPPROTO_*.
4133 * if satype == SADB_SATYPE then satype is mapped to ~0.
4134 * OUT:
4135 * 0: invalid satype.
4136 */
4137 static u_int16_t
4138 key_satype2proto(u_int8_t satype)
4139 {
4140 switch (satype) {
4141 case SADB_SATYPE_UNSPEC:
4142 return IPSEC_PROTO_ANY;
4143 case SADB_SATYPE_AH:
4144 return IPPROTO_AH;
4145 case SADB_SATYPE_ESP:
4146 return IPPROTO_ESP;
4147 case SADB_X_SATYPE_IPCOMP:
4148 return IPPROTO_IPCOMP;
4149 default:
4150 return 0;
4151 }
4152 /* NOTREACHED */
4153 }
4154
4155 /*
4156 * map IPPROTO_* to SADB_SATYPE_*
4157 * OUT:
4158 * 0: invalid protocol type.
4159 */
4160 static u_int8_t
4161 key_proto2satype(u_int16_t proto)
4162 {
4163 switch (proto) {
4164 case IPPROTO_AH:
4165 return SADB_SATYPE_AH;
4166 case IPPROTO_ESP:
4167 return SADB_SATYPE_ESP;
4168 case IPPROTO_IPCOMP:
4169 return SADB_X_SATYPE_IPCOMP;
4170 default:
4171 return 0;
4172 }
4173 /* NOTREACHED */
4174 }
4175
4176 /* %%% PF_KEY */
4177 /*
4178 * SADB_GETSPI processing is to receive
4179 * <base, (SA2), src address, dst address, (SPI range)>
4180 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4181 * tree with the status of LARVAL, and send
4182 * <base, SA(*), address(SD)>
4183 * to the IKMPd.
4184 *
4185 * IN: mhp: pointer to the pointer to each header.
4186 * OUT: NULL if fail.
4187 * other if success, return pointer to the message to send.
4188 */
4189 static int
4190 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4191 {
4192 struct sadb_address *src0, *dst0;
4193 struct secasindex saidx;
4194 struct secashead *newsah;
4195 struct secasvar *newsav;
4196 struct sockaddr *saddr, *daddr;
4197 u_int8_t proto;
4198 u_int32_t spi;
4199 u_int8_t mode;
4200 u_int32_t reqid;
4201 int error;
4202
4203 /* sanity check */
4204 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4205 panic("key_getspi: NULL pointer is passed.\n");
4206
4207 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4208 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
4209 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
4210 return key_senderror(so, m, EINVAL);
4211 }
4212 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4213 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4214 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
4215 return key_senderror(so, m, EINVAL);
4216 }
4217 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4218 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4219 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4220 } else {
4221 mode = IPSEC_MODE_ANY;
4222 reqid = 0;
4223 }
4224
4225 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4226 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4227
4228 /* map satype to proto */
4229 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4230 ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n"));
4231 return key_senderror(so, m, EINVAL);
4232 }
4233
4234 /* make sure if port number is zero. */
4235 saddr = (struct sockaddr *)(src0 + 1);
4236 daddr = (struct sockaddr *)(dst0 + 1);
4237 switch (saddr->sa_family) {
4238 case AF_INET:
4239 if (saddr->sa_len != sizeof(struct sockaddr_in))
4240 return key_senderror(so, m, EINVAL);
4241 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
4242 break;
4243 case AF_INET6:
4244 if (saddr->sa_len != sizeof(struct sockaddr_in6))
4245 return key_senderror(so, m, EINVAL);
4246 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
4247 break;
4248 default:
4249 ; /*???*/
4250 }
4251 switch (daddr->sa_family) {
4252 case AF_INET:
4253 if (daddr->sa_len != sizeof(struct sockaddr_in))
4254 return key_senderror(so, m, EINVAL);
4255 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
4256 break;
4257 case AF_INET6:
4258 if (daddr->sa_len != sizeof(struct sockaddr_in6))
4259 return key_senderror(so, m, EINVAL);
4260 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
4261 break;
4262 default:
4263 ; /*???*/
4264 }
4265
4266 /* XXX boundary check against sa_len */
4267 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4268
4269 /* SPI allocation */
4270 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE],
4271 &saidx);
4272 if (spi == 0)
4273 return key_senderror(so, m, EINVAL);
4274
4275 /* get a SA index */
4276 if ((newsah = key_getsah(&saidx)) == NULL) {
4277 /* create a new SA index */
4278 if ((newsah = key_newsah(&saidx)) == NULL) {
4279 ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n"));
4280 return key_senderror(so, m, ENOBUFS);
4281 }
4282 }
4283
4284 /* get a new SA */
4285 /* XXX rewrite */
4286 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4287 if (newsav == NULL) {
4288 /* XXX don't free new SA index allocated in above. */
4289 return key_senderror(so, m, error);
4290 }
4291
4292 /* set spi */
4293 newsav->spi = htonl(spi);
4294
4295 #ifndef IPSEC_NONBLOCK_ACQUIRE
4296 /* delete the entry in acqtree */
4297 if (mhp->msg->sadb_msg_seq != 0) {
4298 struct secacq *acq;
4299 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
4300 /* reset counter in order to deletion by timehandler. */
4301 acq->created = time_second;
4302 acq->count = 0;
4303 }
4304 }
4305 #endif
4306
4307 {
4308 struct mbuf *n;
4309 struct sadb_sa *m_sa;
4310 struct sadb_msg *newmsg;
4311 int off, len;
4312
4313 /* create new sadb_msg to reply. */
4314 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4315 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4316 if (len > MCLBYTES)
4317 return key_senderror(so, m, ENOBUFS);
4318 n = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
4319 if (!n)
4320 return key_senderror(so, m, ENOBUFS);
4321 n->m_len = len;
4322
4323 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
4324 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
4325
4326 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
4327 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
4328 m_sa->sadb_sa_exttype = SADB_EXT_SA;
4329 m_sa->sadb_sa_spi = htonl(spi);
4330 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
4331
4332 #ifdef DIAGNOSTIC
4333 if (off != len)
4334 panic("length inconsistency in key_getspi");
4335 #endif
4336
4337 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
4338 SADB_EXT_ADDRESS_DST);
4339 if (!n->m_next) {
4340 m_freem(n);
4341 return key_senderror(so, m, ENOBUFS);
4342 }
4343
4344 if (n->m_len < sizeof(struct sadb_msg)) {
4345 n = m_pullup(n, sizeof(struct sadb_msg));
4346 if (n == NULL)
4347 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
4348 }
4349 n->m_pkthdr.len = m_lengthm(n, NULL);
4350
4351 newmsg = mtod(n, struct sadb_msg *);
4352 newmsg->sadb_msg_seq = newsav->seq;
4353 newmsg->sadb_msg_errno = 0;
4354 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4355
4356 m_freem(m);
4357 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
4358 }
4359 }
4360
4361 /*
4362 * allocating new SPI
4363 * called by key_getspi().
4364 * OUT:
4365 * 0: failure.
4366 * others: success.
4367 */
4368 static u_int32_t
4369 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
4370 {
4371 u_int32_t newspi;
4372 u_int32_t min, max;
4373 int count = key_spi_trycnt;
4374
4375 /* set spi range to allocate */
4376 if (spirange != NULL) {
4377 min = spirange->sadb_spirange_min;
4378 max = spirange->sadb_spirange_max;
4379 } else {
4380 min = key_spi_minval;
4381 max = key_spi_maxval;
4382 }
4383 /* IPCOMP needs 2-byte SPI */
4384 if (saidx->proto == IPPROTO_IPCOMP) {
4385 u_int32_t t;
4386 if (min >= 0x10000)
4387 min = 0xffff;
4388 if (max >= 0x10000)
4389 max = 0xffff;
4390 if (min > max) {
4391 t = min; min = max; max = t;
4392 }
4393 }
4394
4395 if (min == max) {
4396 if (key_checkspidup(saidx, min) != NULL) {
4397 ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists already.\n", min));
4398 return 0;
4399 }
4400
4401 count--; /* taking one cost. */
4402 newspi = min;
4403
4404 } else {
4405
4406 /* init SPI */
4407 newspi = 0;
4408
4409 /* when requesting to allocate spi ranged */
4410 while (count--) {
4411 /* generate pseudo-random SPI value ranged. */
4412 newspi = min + (key_random() % (max - min + 1));
4413
4414 if (key_checkspidup(saidx, newspi) == NULL)
4415 break;
4416 }
4417
4418 if (count == 0 || newspi == 0) {
4419 ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is failed.\n"));
4420 return 0;
4421 }
4422 }
4423
4424 /* statistics */
4425 keystat.getspi_count =
4426 (keystat.getspi_count + key_spi_trycnt - count) / 2;
4427
4428 return newspi;
4429 }
4430
4431 /*
4432 * SADB_UPDATE processing
4433 * receive
4434 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4435 * key(AE), (identity(SD),) (sensitivity)>
4436 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
4437 * and send
4438 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4439 * (identity(SD),) (sensitivity)>
4440 * to the ikmpd.
4441 *
4442 * m will always be freed.
4443 */
4444 static int
4445 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4446 {
4447 struct sadb_sa *sa0;
4448 struct sadb_address *src0, *dst0;
4449 struct secasindex saidx;
4450 struct secashead *sah;
4451 struct secasvar *sav;
4452 u_int16_t proto;
4453 u_int8_t mode;
4454 u_int32_t reqid;
4455 int error;
4456
4457 /* sanity check */
4458 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4459 panic("key_update: NULL pointer is passed.\n");
4460
4461 /* map satype to proto */
4462 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4463 ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n"));
4464 return key_senderror(so, m, EINVAL);
4465 }
4466
4467 if (mhp->ext[SADB_EXT_SA] == NULL ||
4468 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4469 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4470 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4471 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4472 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4473 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4474 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4475 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4476 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4477 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4478 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
4479 return key_senderror(so, m, EINVAL);
4480 }
4481 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4482 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4483 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4484 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
4485 return key_senderror(so, m, EINVAL);
4486 }
4487 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4488 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4489 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4490 } else {
4491 mode = IPSEC_MODE_ANY;
4492 reqid = 0;
4493 }
4494 /* XXX boundary checking for other extensions */
4495
4496 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4497 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4498 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4499
4500 /* XXX boundary check against sa_len */
4501 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4502
4503 /* get a SA header */
4504 if ((sah = key_getsah(&saidx)) == NULL) {
4505 ipseclog((LOG_DEBUG, "key_update: no SA index found.\n"));
4506 return key_senderror(so, m, ENOENT);
4507 }
4508
4509 /* set spidx if there */
4510 /* XXX rewrite */
4511 error = key_setident(sah, m, mhp);
4512 if (error)
4513 return key_senderror(so, m, error);
4514
4515 /* find a SA with sequence number. */
4516 #ifdef IPSEC_DOSEQCHECK
4517 if (mhp->msg->sadb_msg_seq != 0
4518 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
4519 ipseclog((LOG_DEBUG,
4520 "key_update: no larval SA with sequence %u exists.\n",
4521 mhp->msg->sadb_msg_seq));
4522 return key_senderror(so, m, ENOENT);
4523 }
4524 #else
4525 if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) {
4526 ipseclog((LOG_DEBUG,
4527 "key_update: no such a SA found (spi:%u)\n",
4528 (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4529 return key_senderror(so, m, EINVAL);
4530 }
4531 #endif
4532
4533 /* validity check */
4534 if (sav->sah->saidx.proto != proto) {
4535 ipseclog((LOG_DEBUG,
4536 "key_update: protocol mismatched (DB=%u param=%u)\n",
4537 sav->sah->saidx.proto, proto));
4538 return key_senderror(so, m, EINVAL);
4539 }
4540 #ifdef IPSEC_DOSEQCHECK
4541 if (sav->spi != sa0->sadb_sa_spi) {
4542 ipseclog((LOG_DEBUG,
4543 "key_update: SPI mismatched (DB:%u param:%u)\n",
4544 (u_int32_t)ntohl(sav->spi),
4545 (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4546 return key_senderror(so, m, EINVAL);
4547 }
4548 #endif
4549 if (sav->pid != mhp->msg->sadb_msg_pid) {
4550 ipseclog((LOG_DEBUG,
4551 "key_update: pid mismatched (DB:%u param:%u)\n",
4552 sav->pid, mhp->msg->sadb_msg_pid));
4553 return key_senderror(so, m, EINVAL);
4554 }
4555
4556 /* copy sav values */
4557 error = key_setsaval(sav, m, mhp);
4558 if (error) {
4559 KEY_FREESAV(&sav);
4560 return key_senderror(so, m, error);
4561 }
4562
4563 /* check SA values to be mature. */
4564 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) {
4565 KEY_FREESAV(&sav);
4566 return key_senderror(so, m, 0);
4567 }
4568
4569 {
4570 struct mbuf *n;
4571
4572 /* set msg buf from mhp */
4573 n = key_getmsgbuf_x1(m, mhp);
4574 if (n == NULL) {
4575 ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
4576 return key_senderror(so, m, ENOBUFS);
4577 }
4578
4579 m_freem(m);
4580 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4581 }
4582 }
4583
4584 /*
4585 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
4586 * only called by key_update().
4587 * OUT:
4588 * NULL : not found
4589 * others : found, pointer to a SA.
4590 */
4591 #ifdef IPSEC_DOSEQCHECK
4592 static struct secasvar *
4593 key_getsavbyseq(struct secashead *sah, u_int32_t seq)
4594 {
4595 struct secasvar *sav;
4596 u_int state;
4597
4598 state = SADB_SASTATE_LARVAL;
4599
4600 /* search SAD with sequence number ? */
4601 LIST_FOREACH(sav, &sah->savtree[state], chain) {
4602
4603 KEY_CHKSASTATE(state, sav->state, "key_getsabyseq");
4604
4605 if (sav->seq == seq) {
4606 SA_ADDREF(sav);
4607 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
4608 kprintf("DP key_getsavbyseq cause "
4609 "refcnt++:%d SA:%p\n",
4610 sav->refcnt, sav));
4611 return sav;
4612 }
4613 }
4614
4615 return NULL;
4616 }
4617 #endif
4618
4619 /*
4620 * SADB_ADD processing
4621 * add an entry to SA database, when received
4622 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4623 * key(AE), (identity(SD),) (sensitivity)>
4624 * from the ikmpd,
4625 * and send
4626 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4627 * (identity(SD),) (sensitivity)>
4628 * to the ikmpd.
4629 *
4630 * IGNORE identity and sensitivity messages.
4631 *
4632 * m will always be freed.
4633 */
4634 static int
4635 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4636 {
4637 struct sadb_sa *sa0;
4638 struct sadb_address *src0, *dst0;
4639 struct secasindex saidx;
4640 struct secashead *newsah;
4641 struct secasvar *newsav;
4642 u_int16_t proto;
4643 u_int8_t mode;
4644 u_int32_t reqid;
4645 int error;
4646
4647 /* sanity check */
4648 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4649 panic("key_add: NULL pointer is passed.\n");
4650
4651 /* map satype to proto */
4652 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4653 ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n"));
4654 return key_senderror(so, m, EINVAL);
4655 }
4656
4657 if (mhp->ext[SADB_EXT_SA] == NULL ||
4658 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4659 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4660 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4661 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4662 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4663 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4664 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4665 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4666 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4667 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4668 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
4669 return key_senderror(so, m, EINVAL);
4670 }
4671 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4672 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4673 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4674 /* XXX need more */
4675 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
4676 return key_senderror(so, m, EINVAL);
4677 }
4678 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4679 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4680 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4681 } else {
4682 mode = IPSEC_MODE_ANY;
4683 reqid = 0;
4684 }
4685
4686 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4687 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
4688 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
4689
4690 /* XXX boundary check against sa_len */
4691 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4692
4693 /* get a SA header */
4694 if ((newsah = key_getsah(&saidx)) == NULL) {
4695 /* create a new SA header */
4696 if ((newsah = key_newsah(&saidx)) == NULL) {
4697 ipseclog((LOG_DEBUG, "key_add: No more memory.\n"));
4698 return key_senderror(so, m, ENOBUFS);
4699 }
4700 }
4701
4702 /* set spidx if there */
4703 /* XXX rewrite */
4704 error = key_setident(newsah, m, mhp);
4705 if (error) {
4706 return key_senderror(so, m, error);
4707 }
4708
4709 /* create new SA entry. */
4710 /* We can create new SA only if SPI is differenct. */
4711 if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) {
4712 ipseclog((LOG_DEBUG, "key_add: SA already exists.\n"));
4713 return key_senderror(so, m, EEXIST);
4714 }
4715 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4716 if (newsav == NULL) {
4717 return key_senderror(so, m, error);
4718 }
4719
4720 /* check SA values to be mature. */
4721 if ((error = key_mature(newsav)) != 0) {
4722 KEY_FREESAV(&newsav);
4723 return key_senderror(so, m, error);
4724 }
4725
4726 /*
4727 * don't call key_freesav() here, as we would like to keep the SA
4728 * in the database on success.
4729 */
4730
4731 {
4732 struct mbuf *n;
4733
4734 /* set msg buf from mhp */
4735 n = key_getmsgbuf_x1(m, mhp);
4736 if (n == NULL) {
4737 ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
4738 return key_senderror(so, m, ENOBUFS);
4739 }
4740
4741 m_freem(m);
4742 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4743 }
4744 }
4745
4746 /* m is retained */
4747 static int
4748 key_setident(struct secashead *sah, struct mbuf *m,
4749 const struct sadb_msghdr *mhp)
4750 {
4751 const struct sadb_ident *idsrc, *iddst;
4752 int idsrclen, iddstlen;
4753
4754 /* sanity check */
4755 if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4756 panic("key_setident: NULL pointer is passed.\n");
4757
4758 /* don't make buffer if not there */
4759 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
4760 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
4761 sah->idents = NULL;
4762 sah->identd = NULL;
4763 return 0;
4764 }
4765
4766 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
4767 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
4768 ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n"));
4769 return EINVAL;
4770 }
4771
4772 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
4773 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
4774 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
4775 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];
4776
4777 /* validity check */
4778 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
4779 ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n"));
4780 return EINVAL;
4781 }
4782
4783 switch (idsrc->sadb_ident_type) {
4784 case SADB_IDENTTYPE_PREFIX:
4785 case SADB_IDENTTYPE_FQDN:
4786 case SADB_IDENTTYPE_USERFQDN:
4787 default:
4788 /* XXX do nothing */
4789 sah->idents = NULL;
4790 sah->identd = NULL;
4791 return 0;
4792 }
4793
4794 /* make structure */
4795 KMALLOC(sah->idents, struct sadb_ident *, idsrclen);
4796 if (sah->idents == NULL) {
4797 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
4798 return ENOBUFS;
4799 }
4800 KMALLOC(sah->identd, struct sadb_ident *, iddstlen);
4801 if (sah->identd == NULL) {
4802 KFREE(sah->idents);
4803 sah->idents = NULL;
4804 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
4805 return ENOBUFS;
4806 }
4807 bcopy(idsrc, sah->idents, idsrclen);
4808 bcopy(iddst, sah->identd, iddstlen);
4809
4810 return 0;
4811 }
4812
4813 /*
4814 * m will not be freed on return.
4815 * it is caller's responsibility to free the result.
4816 */
4817 static struct mbuf *
4818 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
4819 {
4820 struct mbuf *n;
4821
4822 /* sanity check */
4823 if (m == NULL || mhp == NULL || mhp->msg == NULL)
4824 panic("key_getmsgbuf_x1: NULL pointer is passed.\n");
4825
4826 /* create new sadb_msg to reply. */
4827 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
4828 SADB_EXT_SA, SADB_X_EXT_SA2,
4829 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
4830 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
4831 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
4832 if (!n)
4833 return NULL;
4834
4835 if (n->m_len < sizeof(struct sadb_msg)) {
4836 n = m_pullup(n, sizeof(struct sadb_msg));
4837 if (n == NULL)
4838 return NULL;
4839 }
4840 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
4841 mtod(n, struct sadb_msg *)->sadb_msg_len =
4842 PFKEY_UNIT64(n->m_pkthdr.len);
4843
4844 return n;
4845 }
4846
4847 static int key_delete_all (struct socket *, struct mbuf *,
4848 const struct sadb_msghdr *, u_int16_t);
4849
4850 /*
4851 * SADB_DELETE processing
4852 * receive
4853 * <base, SA(*), address(SD)>
4854 * from the ikmpd, and set SADB_SASTATE_DEAD,
4855 * and send,
4856 * <base, SA(*), address(SD)>
4857 * to the ikmpd.
4858 *
4859 * m will always be freed.
4860 */
4861 static int
4862 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4863 {
4864 struct sadb_sa *sa0;
4865 struct sadb_address *src0, *dst0;
4866 struct secasindex saidx;
4867 struct secashead *sah;
4868 struct secasvar *sav = NULL;
4869 u_int16_t proto;
4870
4871 /* sanity check */
4872 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4873 panic("key_delete: NULL pointer is passed.\n");
4874
4875 /* map satype to proto */
4876 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4877 ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n"));
4878 return key_senderror(so, m, EINVAL);
4879 }
4880
4881 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4882 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
4883 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4884 return key_senderror(so, m, EINVAL);
4885 }
4886
4887 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4888 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4889 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4890 return key_senderror(so, m, EINVAL);
4891 }
4892
4893 if (mhp->ext[SADB_EXT_SA] == NULL) {
4894 /*
4895 * Caller wants us to delete all non-LARVAL SAs
4896 * that match the src/dst. This is used during
4897 * IKE INITIAL-CONTACT.
4898 */
4899 ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n"));
4900 return key_delete_all(so, m, mhp, proto);
4901 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
4902 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4903 return key_senderror(so, m, EINVAL);
4904 }
4905
4906 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4907 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4908 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4909
4910 /* XXX boundary check against sa_len */
4911 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
4912
4913 /* get a SA header */
4914 LIST_FOREACH(sah, &sahtree, chain) {
4915 if (sah->state == SADB_SASTATE_DEAD)
4916 continue;
4917 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
4918 continue;
4919
4920 /* get a SA with SPI. */
4921 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
4922 if (sav)
4923 break;
4924 }
4925 if (sah == NULL) {
4926 ipseclog((LOG_DEBUG, "key_delete: no SA found.\n"));
4927 return key_senderror(so, m, ENOENT);
4928 }
4929
4930 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4931 KEY_FREESAV(&sav);
4932
4933 {
4934 struct mbuf *n;
4935 struct sadb_msg *newmsg;
4936
4937 /* create new sadb_msg to reply. */
4938 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
4939 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
4940 if (!n)
4941 return key_senderror(so, m, ENOBUFS);
4942
4943 if (n->m_len < sizeof(struct sadb_msg)) {
4944 n = m_pullup(n, sizeof(struct sadb_msg));
4945 if (n == NULL)
4946 return key_senderror(so, m, ENOBUFS);
4947 }
4948 newmsg = mtod(n, struct sadb_msg *);
4949 newmsg->sadb_msg_errno = 0;
4950 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4951
4952 m_freem(m);
4953 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4954 }
4955 }
4956
4957 /*
4958 * delete all SAs for src/dst. Called from key_delete().
4959 */
4960 static int
4961 key_delete_all(struct socket *so, struct mbuf *m,
4962 const struct sadb_msghdr *mhp, u_int16_t proto)
4963 {
4964 struct sadb_address *src0, *dst0;
4965 struct secasindex saidx;
4966 struct secashead *sah;
4967 struct secasvar *sav, *nextsav;
4968 u_int stateidx, state;
4969 struct mbuf *n;
4970 struct sadb_msg *newmsg;
4971
4972 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4973 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4974
4975 /* XXX boundary check against sa_len */
4976 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
4977
4978 LIST_FOREACH(sah, &sahtree, chain) {
4979 if (sah->state == SADB_SASTATE_DEAD)
4980 continue;
4981 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
4982 continue;
4983
4984 /* Delete all non-LARVAL SAs. */
4985 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive);
4986 stateidx++) {
4987 state = saorder_state_alive[stateidx];
4988 if (state == SADB_SASTATE_LARVAL)
4989 continue;
4990 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain,
4991 nextsav) {
4992 /* sanity check */
4993 if (sav->state != state) {
4994 ipseclog((LOG_DEBUG, "key_delete_all: "
4995 "invalid sav->state "
4996 "(queue: %d SA: %d)\n",
4997 state, sav->state));
4998 continue;
4999 }
5000
5001 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
5002 KEY_FREESAV(&sav);
5003 }
5004 }
5005 }
5006
5007 /* create new sadb_msg to reply. */
5008 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
5009 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
5010 if (!n)
5011 return key_senderror(so, m, ENOBUFS);
5012
5013 if (n->m_len < sizeof(struct sadb_msg)) {
5014 n = m_pullup(n, sizeof(struct sadb_msg));
5015 if (n == NULL)
5016 return key_senderror(so, m, ENOBUFS);
5017 }
5018 newmsg = mtod(n, struct sadb_msg *);
5019 newmsg->sadb_msg_errno = 0;
5020 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5021
5022 m_freem(m);
5023 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5024 }
5025
5026 /*
5027 * SADB_GET processing
5028 * receive
5029 * <base, SA(*), address(SD)>
5030 * from the ikmpd, and get a SP and a SA to respond,
5031 * and send,
5032 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
5033 * (identity(SD),) (sensitivity)>
5034 * to the ikmpd.
5035 *
5036 * m will always be freed.
5037 */
5038 static int
5039 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5040 {
5041 struct sadb_sa *sa0;
5042 struct sadb_address *src0, *dst0;
5043 struct secasindex saidx;
5044 struct secashead *sah;
5045 struct secasvar *sav = NULL;
5046 u_int16_t proto;
5047
5048 /* sanity check */
5049 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5050 panic("key_get: NULL pointer is passed.\n");
5051
5052 /* map satype to proto */
5053 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5054 ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n"));
5055 return key_senderror(so, m, EINVAL);
5056 }
5057
5058 if (mhp->ext[SADB_EXT_SA] == NULL ||
5059 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5060 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
5061 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
5062 return key_senderror(so, m, EINVAL);
5063 }
5064 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
5065 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5066 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
5067 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
5068 return key_senderror(so, m, EINVAL);
5069 }
5070
5071 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5072 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5073 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5074
5075 /* XXX boundary check against sa_len */
5076 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5077
5078 /* get a SA header */
5079 LIST_FOREACH(sah, &sahtree, chain) {
5080 if (sah->state == SADB_SASTATE_DEAD)
5081 continue;
5082 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
5083 continue;
5084
5085 /* get a SA with SPI. */
5086 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
5087 if (sav)
5088 break;
5089 }
5090 if (sah == NULL) {
5091 ipseclog((LOG_DEBUG, "key_get: no SA found.\n"));
5092 return key_senderror(so, m, ENOENT);
5093 }
5094
5095 {
5096 struct mbuf *n;
5097 u_int8_t satype;
5098
5099 /* map proto to satype */
5100 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
5101 ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n"));
5102 return key_senderror(so, m, EINVAL);
5103 }
5104
5105 /* create new sadb_msg to reply. */
5106 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
5107 mhp->msg->sadb_msg_pid);
5108 if (!n)
5109 return key_senderror(so, m, ENOBUFS);
5110
5111 m_freem(m);
5112 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5113 }
5114 }
5115
5116 /* XXX make it sysctl-configurable? */
5117 static void
5118 key_getcomb_setlifetime(struct sadb_comb *comb)
5119 {
5120
5121 comb->sadb_comb_soft_allocations = 1;
5122 comb->sadb_comb_hard_allocations = 1;
5123 comb->sadb_comb_soft_bytes = 0;
5124 comb->sadb_comb_hard_bytes = 0;
5125 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
5126 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
5127 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
5128 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
5129 }
5130
5131 /*
5132 * XXX reorder combinations by preference
5133 * XXX no idea if the user wants ESP authentication or not
5134 */
5135 static struct mbuf *
5136 key_getcomb_esp(void)
5137 {
5138 struct sadb_comb *comb;
5139 struct enc_xform *algo;
5140 struct mbuf *result = NULL, *m, *n;
5141 int encmin;
5142 int i, off, o;
5143 int totlen;
5144 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5145
5146 m = NULL;
5147 for (i = 1; i <= SADB_EALG_MAX; i++) {
5148 algo = esp_algorithm_lookup(i);
5149 if (algo == NULL)
5150 continue;
5151
5152 /* discard algorithms with key size smaller than system min */
5153 if (_BITS(algo->maxkey) < ipsec_esp_keymin)
5154 continue;
5155 if (_BITS(algo->minkey) < ipsec_esp_keymin)
5156 encmin = ipsec_esp_keymin;
5157 else
5158 encmin = _BITS(algo->minkey);
5159
5160 if (ipsec_esp_auth)
5161 m = key_getcomb_ah();
5162 else {
5163 KASSERT(l <= MLEN,
5164 ("key_getcomb_esp: l=%u > MLEN=%lu",
5165 l, (u_long) MLEN));
5166 MGET(m, MB_DONTWAIT, MT_DATA);
5167 if (m) {
5168 M_ALIGN(m, l);
5169 m->m_len = l;
5170 m->m_next = NULL;
5171 bzero(mtod(m, caddr_t), m->m_len);
5172 }
5173 }
5174 if (!m)
5175 goto fail;
5176
5177 totlen = m_lengthm(m, NULL);
5178 KASSERT((totlen % l) == 0,
5179 ("key_getcomb_esp: totlen=%u, l=%u", totlen, l));
5180
5181 for (off = 0; off < totlen; off += l) {
5182 n = m_pulldown(m, off, l, &o);
5183 if (!n) {
5184 /* m is already freed */
5185 goto fail;
5186 }
5187 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
5188 bzero(comb, sizeof(*comb));
5189 key_getcomb_setlifetime(comb);
5190 comb->sadb_comb_encrypt = i;
5191 comb->sadb_comb_encrypt_minbits = encmin;
5192 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
5193 }
5194
5195 if (!result)
5196 result = m;
5197 else
5198 m_cat(result, m);
5199 }
5200
5201 return result;
5202
5203 fail:
5204 if (result)
5205 m_freem(result);
5206 return NULL;
5207 }
5208
5209 static void
5210 key_getsizes_ah(
5211 const struct auth_hash *ah,
5212 int alg,
5213 u_int16_t* min,
5214 u_int16_t* max)
5215 {
5216 *min = *max = ah->keysize;
5217 if (ah->keysize == 0) {
5218 /*
5219 * Transform takes arbitrary key size but algorithm
5220 * key size is restricted. Enforce this here.
5221 */
5222 switch (alg) {
5223 case SADB_X_AALG_MD5: *min = *max = 16; break;
5224 case SADB_X_AALG_SHA: *min = *max = 20; break;
5225 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
5226 default:
5227 DPRINTF(("key_getsizes_ah: unknown AH algorithm %u\n",
5228 alg));
5229 break;
5230 }
5231 }
5232 }
5233
5234 /*
5235 * XXX reorder combinations by preference
5236 */
5237 static struct mbuf *
5238 key_getcomb_ah(void)
5239 {
5240 struct sadb_comb *comb;
5241 struct auth_hash *algo;
5242 struct mbuf *m;
5243 u_int16_t minkeysize, maxkeysize;
5244 int i;
5245 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5246
5247 m = NULL;
5248 for (i = 1; i <= SADB_AALG_MAX; i++) {
5249 #if 1
5250 /* we prefer HMAC algorithms, not old algorithms */
5251 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC)
5252 continue;
5253 #endif
5254 algo = ah_algorithm_lookup(i);
5255 if (!algo)
5256 continue;
5257 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
5258 /* discard algorithms with key size smaller than system min */
5259 if (_BITS(minkeysize) < ipsec_ah_keymin)
5260 continue;
5261
5262 if (!m) {
5263 KASSERT(l <= MLEN,
5264 ("key_getcomb_ah: l=%u > MLEN=%lu",
5265 l, (u_long) MLEN));
5266 MGET(m, MB_DONTWAIT, MT_DATA);
5267 if (m) {
5268 M_ALIGN(m, l);
5269 m->m_len = l;
5270 m->m_next = NULL;
5271 }
5272 } else
5273 M_PREPEND(m, l, MB_DONTWAIT);
5274 if (!m)
5275 return NULL;
5276
5277 comb = mtod(m, struct sadb_comb *);
5278 bzero(comb, sizeof(*comb));
5279 key_getcomb_setlifetime(comb);
5280 comb->sadb_comb_auth = i;
5281 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
5282 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
5283 }
5284
5285 return m;
5286 }
5287
5288 /*
5289 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
5290 * XXX reorder combinations by preference
5291 */
5292 static struct mbuf *
5293 key_getcomb_ipcomp(void)
5294 {
5295 struct sadb_comb *comb;
5296 struct comp_algo *algo;
5297 struct mbuf *m;
5298 int i;
5299 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5300
5301 m = NULL;
5302 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
5303 algo = ipcomp_algorithm_lookup(i);
5304 if (!algo)
5305 continue;
5306
5307 if (!m) {
5308 KASSERT(l <= MLEN,
5309 ("key_getcomb_ipcomp: l=%u > MLEN=%lu",
5310 l, (u_long) MLEN));
5311 MGET(m, MB_DONTWAIT, MT_DATA);
5312 if (m) {
5313 M_ALIGN(m, l);
5314 m->m_len = l;
5315 m->m_next = NULL;
5316 }
5317 } else
5318 M_PREPEND(m, l, MB_DONTWAIT);
5319 if (!m)
5320 return NULL;
5321
5322 comb = mtod(m, struct sadb_comb *);
5323 bzero(comb, sizeof(*comb));
5324 key_getcomb_setlifetime(comb);
5325 comb->sadb_comb_encrypt = i;
5326 /* what should we set into sadb_comb_*_{min,max}bits? */
5327 }
5328
5329 return m;
5330 }
5331
5332 /*
5333 * XXX no way to pass mode (transport/tunnel) to userland
5334 * XXX replay checking?
5335 * XXX sysctl interface to ipsec_{ah,esp}_keymin
5336 */
5337 static struct mbuf *
5338 key_getprop(const struct secasindex *saidx)
5339 {
5340 struct sadb_prop *prop;
5341 struct mbuf *m;
5342 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
5343
5344 switch (saidx->proto) {
5345 case IPPROTO_ESP:
5346 m = key_getcomb_esp();
5347 break;
5348 case IPPROTO_AH:
5349 m = key_getcomb_ah();
5350 break;
5351 case IPPROTO_IPCOMP:
5352 m = key_getcomb_ipcomp();
5353 break;
5354 default:
5355 return NULL;
5356 }
5357
5358 if (!m)
5359 return NULL;
5360 M_PREPEND(m, l, MB_DONTWAIT);
5361 if (!m)
5362 return NULL;
5363
5364 prop = mtod(m, struct sadb_prop *);
5365 bzero(prop, sizeof(*prop));
5366 prop->sadb_prop_len = PFKEY_UNIT64(m_lengthm(m, NULL));
5367 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
5368 prop->sadb_prop_replay = 32; /* XXX */
5369
5370 return m;
5371 }
5372
5373 /*
5374 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
5375 * send
5376 * <base, SA, address(SD), (address(P)), x_policy,
5377 * (identity(SD),) (sensitivity,) proposal>
5378 * to KMD, and expect to receive
5379 * <base> with SADB_ACQUIRE if error occured,
5380 * or
5381 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
5382 * from KMD by PF_KEY.
5383 *
5384 * XXX x_policy is outside of RFC2367 (KAME extension).
5385 * XXX sensitivity is not supported.
5386 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
5387 * see comment for key_getcomb_ipcomp().
5388 *
5389 * OUT:
5390 * 0 : succeed
5391 * others: error number
5392 */
5393 static int
5394 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
5395 {
5396 struct mbuf *result = NULL, *m;
5397 #ifndef IPSEC_NONBLOCK_ACQUIRE
5398 struct secacq *newacq;
5399 #endif
5400 u_int8_t satype;
5401 int error = -1;
5402 u_int32_t seq;
5403
5404 /* sanity check */
5405 KASSERT(saidx != NULL, ("key_acquire: null saidx"));
5406 satype = key_proto2satype(saidx->proto);
5407 KASSERT(satype != 0,
5408 ("key_acquire: null satype, protocol %u", saidx->proto));
5409
5410 #ifndef IPSEC_NONBLOCK_ACQUIRE
5411 /*
5412 * We never do anything about acquirng SA. There is anather
5413 * solution that kernel blocks to send SADB_ACQUIRE message until
5414 * getting something message from IKEd. In later case, to be
5415 * managed with ACQUIRING list.
5416 */
5417 /* Get an entry to check whether sending message or not. */
5418 if ((newacq = key_getacq(saidx)) != NULL) {
5419 if (key_blockacq_count < newacq->count) {
5420 /* reset counter and do send message. */
5421 newacq->count = 0;
5422 } else {
5423 /* increment counter and do nothing. */
5424 newacq->count++;
5425 return 0;
5426 }
5427 } else {
5428 /* make new entry for blocking to send SADB_ACQUIRE. */
5429 if ((newacq = key_newacq(saidx)) == NULL)
5430 return ENOBUFS;
5431
5432 /* add to acqtree */
5433 LIST_INSERT_HEAD(&acqtree, newacq, chain);
5434 }
5435 #endif
5436
5437
5438 #ifndef IPSEC_NONBLOCK_ACQUIRE
5439 seq = newacq->seq;
5440 #else
5441 seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
5442 #endif
5443 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
5444 if (!m) {
5445 error = ENOBUFS;
5446 goto fail;
5447 }
5448 result = m;
5449
5450 /* set sadb_address for saidx's. */
5451 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
5452 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5453 if (!m) {
5454 error = ENOBUFS;
5455 goto fail;
5456 }
5457 m_cat(result, m);
5458
5459 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
5460 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5461 if (!m) {
5462 error = ENOBUFS;
5463 goto fail;
5464 }
5465 m_cat(result, m);
5466
5467 /* XXX proxy address (optional) */
5468
5469 /* set sadb_x_policy */
5470 if (sp) {
5471 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id);
5472 if (!m) {
5473 error = ENOBUFS;
5474 goto fail;
5475 }
5476 m_cat(result, m);
5477 }
5478
5479 /* XXX identity (optional) */
5480 #if 0
5481 if (idexttype && fqdn) {
5482 /* create identity extension (FQDN) */
5483 struct sadb_ident *id;
5484 int fqdnlen;
5485
5486 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
5487 id = (struct sadb_ident *)p;
5488 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5489 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5490 id->sadb_ident_exttype = idexttype;
5491 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
5492 bcopy(fqdn, id + 1, fqdnlen);
5493 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
5494 }
5495
5496 if (idexttype) {
5497 /* create identity extension (USERFQDN) */
5498 struct sadb_ident *id;
5499 int userfqdnlen;
5500
5501 if (userfqdn) {
5502 /* +1 for terminating-NUL */
5503 userfqdnlen = strlen(userfqdn) + 1;
5504 } else
5505 userfqdnlen = 0;
5506 id = (struct sadb_ident *)p;
5507 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5508 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5509 id->sadb_ident_exttype = idexttype;
5510 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
5511 /* XXX is it correct? */
5512 if (curproc && curproc->p_cred)
5513 id->sadb_ident_id = curproc->p_cred->p_ruid;
5514 if (userfqdn && userfqdnlen)
5515 bcopy(userfqdn, id + 1, userfqdnlen);
5516 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
5517 }
5518 #endif
5519
5520 /* XXX sensitivity (optional) */
5521
5522 /* create proposal/combination extension */
5523 m = key_getprop(saidx);
5524 #if 0
5525 /*
5526 * spec conformant: always attach proposal/combination extension,
5527 * the problem is that we have no way to attach it for ipcomp,
5528 * due to the way sadb_comb is declared in RFC2367.
5529 */
5530 if (!m) {
5531 error = ENOBUFS;
5532 goto fail;
5533 }
5534 m_cat(result, m);
5535 #else
5536 /*
5537 * outside of spec; make proposal/combination extension optional.
5538 */
5539 if (m)
5540 m_cat(result, m);
5541 #endif
5542
5543 if ((result->m_flags & M_PKTHDR) == 0) {
5544 error = EINVAL;
5545 goto fail;
5546 }
5547
5548 if (result->m_len < sizeof(struct sadb_msg)) {
5549 result = m_pullup(result, sizeof(struct sadb_msg));
5550 if (result == NULL) {
5551 error = ENOBUFS;
5552 goto fail;
5553 }
5554 }
5555 result->m_pkthdr.len = m_lengthm(result, NULL);
5556 mtod(result, struct sadb_msg *)->sadb_msg_len =
5557 PFKEY_UNIT64(result->m_pkthdr.len);
5558
5559 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
5560
5561 fail:
5562 if (result)
5563 m_freem(result);
5564 return error;
5565 }
5566
5567 #ifndef IPSEC_NONBLOCK_ACQUIRE
5568 static struct secacq *
5569 key_newacq(const struct secasindex *saidx)
5570 {
5571 struct secacq *newacq;
5572
5573 /* get new entry */
5574 KMALLOC(newacq, struct secacq *, sizeof(struct secacq));
5575 if (newacq == NULL) {
5576 ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n"));
5577 return NULL;
5578 }
5579 bzero(newacq, sizeof(*newacq));
5580
5581 /* copy secindex */
5582 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
5583 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq);
5584 newacq->created = time_second;
5585 newacq->count = 0;
5586
5587 return newacq;
5588 }
5589
5590 static struct secacq *
5591 key_getacq(const struct secasindex *saidx)
5592 {
5593 struct secacq *acq;
5594
5595 LIST_FOREACH(acq, &acqtree, chain) {
5596 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
5597 return acq;
5598 }
5599
5600 return NULL;
5601 }
5602
5603 static struct secacq *
5604 key_getacqbyseq(u_int32_t seq)
5605 {
5606 struct secacq *acq;
5607
5608 LIST_FOREACH(acq, &acqtree, chain) {
5609 if (acq->seq == seq)
5610 return acq;
5611 }
5612
5613 return NULL;
5614 }
5615 #endif
5616
5617 static struct secspacq *
5618 key_newspacq(struct secpolicyindex *spidx)
5619 {
5620 struct secspacq *acq;
5621
5622 /* get new entry */
5623 KMALLOC(acq, struct secspacq *, sizeof(struct secspacq));
5624 if (acq == NULL) {
5625 ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n"));
5626 return NULL;
5627 }
5628 bzero(acq, sizeof(*acq));
5629
5630 /* copy secindex */
5631 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
5632 acq->created = time_second;
5633 acq->count = 0;
5634
5635 return acq;
5636 }
5637
5638 static struct secspacq *
5639 key_getspacq(struct secpolicyindex *spidx)
5640 {
5641 struct secspacq *acq;
5642
5643 LIST_FOREACH(acq, &spacqtree, chain) {
5644 if (key_cmpspidx_exactly(spidx, &acq->spidx))
5645 return acq;
5646 }
5647
5648 return NULL;
5649 }
5650
5651 /*
5652 * SADB_ACQUIRE processing,
5653 * in first situation, is receiving
5654 * <base>
5655 * from the ikmpd, and clear sequence of its secasvar entry.
5656 *
5657 * In second situation, is receiving
5658 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5659 * from a user land process, and return
5660 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5661 * to the socket.
5662 *
5663 * m will always be freed.
5664 */
5665 static int
5666 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5667 {
5668 const struct sadb_address *src0, *dst0;
5669 struct secasindex saidx;
5670 struct secashead *sah;
5671 u_int16_t proto;
5672 int error;
5673
5674 /* sanity check */
5675 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5676 panic("key_acquire2: NULL pointer is passed.\n");
5677
5678 /*
5679 * Error message from KMd.
5680 * We assume that if error was occured in IKEd, the length of PFKEY
5681 * message is equal to the size of sadb_msg structure.
5682 * We do not raise error even if error occured in this function.
5683 */
5684 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
5685 #ifndef IPSEC_NONBLOCK_ACQUIRE
5686 struct secacq *acq;
5687
5688 /* check sequence number */
5689 if (mhp->msg->sadb_msg_seq == 0) {
5690 ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence number.\n"));
5691 m_freem(m);
5692 return 0;
5693 }
5694
5695 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
5696 /*
5697 * the specified larval SA is already gone, or we got
5698 * a bogus sequence number. we can silently ignore it.
5699 */
5700 m_freem(m);
5701 return 0;
5702 }
5703
5704 /* reset acq counter in order to deletion by timehander. */
5705 acq->created = time_second;
5706 acq->count = 0;
5707 #endif
5708 m_freem(m);
5709 return 0;
5710 }
5711
5712 /*
5713 * This message is from user land.
5714 */
5715
5716 /* map satype to proto */
5717 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5718 ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n"));
5719 return key_senderror(so, m, EINVAL);
5720 }
5721
5722 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5723 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
5724 mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
5725 /* error */
5726 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
5727 return key_senderror(so, m, EINVAL);
5728 }
5729 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5730 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
5731 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
5732 /* error */
5733 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
5734 return key_senderror(so, m, EINVAL);
5735 }
5736
5737 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5738 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5739
5740 /* XXX boundary check against sa_len */
5741 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5742
5743 /* get a SA index */
5744 LIST_FOREACH(sah, &sahtree, chain) {
5745 if (sah->state == SADB_SASTATE_DEAD)
5746 continue;
5747 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
5748 break;
5749 }
5750 if (sah != NULL) {
5751 ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n"));
5752 return key_senderror(so, m, EEXIST);
5753 }
5754
5755 error = key_acquire(&saidx, NULL);
5756 if (error != 0) {
5757 ipseclog((LOG_DEBUG, "key_acquire2: error %d returned "
5758 "from key_acquire.\n", mhp->msg->sadb_msg_errno));
5759 return key_senderror(so, m, error);
5760 }
5761
5762 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
5763 }
5764
5765 /*
5766 * SADB_REGISTER processing.
5767 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
5768 * receive
5769 * <base>
5770 * from the ikmpd, and register a socket to send PF_KEY messages,
5771 * and send
5772 * <base, supported>
5773 * to KMD by PF_KEY.
5774 * If socket is detached, must free from regnode.
5775 *
5776 * m will always be freed.
5777 */
5778 static int
5779 key_register(struct socket *so, struct mbuf *m,
5780 const struct sadb_msghdr *mhp)
5781 {
5782 struct secreg *reg, *newreg = 0;
5783
5784 /* sanity check */
5785 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5786 panic("key_register: NULL pointer is passed.\n");
5787
5788 /* check for invalid register message */
5789 if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0]))
5790 return key_senderror(so, m, EINVAL);
5791
5792 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
5793 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
5794 goto setmsg;
5795
5796 /* check whether existing or not */
5797 LIST_FOREACH(reg, &regtree[mhp->msg->sadb_msg_satype], chain) {
5798 if (reg->so == so) {
5799 ipseclog((LOG_DEBUG, "key_register: socket exists already.\n"));
5800 return key_senderror(so, m, EEXIST);
5801 }
5802 }
5803
5804 /* create regnode */
5805 KMALLOC(newreg, struct secreg *, sizeof(*newreg));
5806 if (newreg == NULL) {
5807 ipseclog((LOG_DEBUG, "key_register: No more memory.\n"));
5808 return key_senderror(so, m, ENOBUFS);
5809 }
5810 bzero((caddr_t)newreg, sizeof(*newreg));
5811
5812 newreg->so = so;
5813 ((struct keycb *)sotorawcb(so))->kp_registered++;
5814
5815 /* add regnode to regtree. */
5816 LIST_INSERT_HEAD(&regtree[mhp->msg->sadb_msg_satype], newreg, chain);
5817
5818 setmsg:
5819 {
5820 struct mbuf *n;
5821 struct sadb_msg *newmsg;
5822 struct sadb_supported *sup;
5823 u_int len, alen, elen;
5824 int off;
5825 int i;
5826 struct sadb_alg *alg;
5827
5828 /* create new sadb_msg to reply. */
5829 alen = 0;
5830 for (i = 1; i <= SADB_AALG_MAX; i++) {
5831 if (ah_algorithm_lookup(i))
5832 alen += sizeof(struct sadb_alg);
5833 }
5834 if (alen)
5835 alen += sizeof(struct sadb_supported);
5836 elen = 0;
5837 for (i = 1; i <= SADB_EALG_MAX; i++) {
5838 if (esp_algorithm_lookup(i))
5839 elen += sizeof(struct sadb_alg);
5840 }
5841 if (elen)
5842 elen += sizeof(struct sadb_supported);
5843
5844 len = sizeof(struct sadb_msg) + alen + elen;
5845
5846 if (len > MCLBYTES)
5847 return key_senderror(so, m, ENOBUFS);
5848 n = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
5849 if (!n)
5850 return key_senderror(so, m, ENOBUFS);
5851 n->m_pkthdr.len = n->m_len = len;
5852
5853 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
5854 newmsg = mtod(n, struct sadb_msg *);
5855 newmsg->sadb_msg_errno = 0;
5856 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
5857 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
5858
5859 /* for authentication algorithm */
5860 if (alen) {
5861 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
5862 sup->sadb_supported_len = PFKEY_UNIT64(alen);
5863 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
5864 off += PFKEY_ALIGN8(sizeof(*sup));
5865
5866 for (i = 1; i <= SADB_AALG_MAX; i++) {
5867 struct auth_hash *aalgo;
5868 u_int16_t minkeysize, maxkeysize;
5869
5870 aalgo = ah_algorithm_lookup(i);
5871 if (!aalgo)
5872 continue;
5873 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
5874 alg->sadb_alg_id = i;
5875 alg->sadb_alg_ivlen = 0;
5876 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
5877 alg->sadb_alg_minbits = _BITS(minkeysize);
5878 alg->sadb_alg_maxbits = _BITS(maxkeysize);
5879 off += PFKEY_ALIGN8(sizeof(*alg));
5880 }
5881 }
5882
5883 /* for encryption algorithm */
5884 if (elen) {
5885 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
5886 sup->sadb_supported_len = PFKEY_UNIT64(elen);
5887 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
5888 off += PFKEY_ALIGN8(sizeof(*sup));
5889
5890 for (i = 1; i <= SADB_EALG_MAX; i++) {
5891 struct enc_xform *ealgo;
5892
5893 ealgo = esp_algorithm_lookup(i);
5894 if (!ealgo)
5895 continue;
5896 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
5897 alg->sadb_alg_id = i;
5898 alg->sadb_alg_ivlen = ealgo->blocksize;
5899 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
5900 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
5901 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
5902 }
5903 }
5904
5905 #ifdef DIGAGNOSTIC
5906 if (off != len)
5907 panic("length assumption failed in key_register");
5908 #endif
5909
5910 m_freem(m);
5911 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
5912 }
5913 }
5914
5915 /*
5916 * free secreg entry registered.
5917 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
5918 */
5919 void
5920 key_freereg(struct socket *so)
5921 {
5922 struct secreg *reg;
5923 int i;
5924
5925 /* sanity check */
5926 if (so == NULL)
5927 panic("key_freereg: NULL pointer is passed.\n");
5928
5929 /*
5930 * check whether existing or not.
5931 * check all type of SA, because there is a potential that
5932 * one socket is registered to multiple type of SA.
5933 */
5934 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
5935 LIST_FOREACH(reg, &regtree[i], chain) {
5936 if (reg->so == so
5937 && __LIST_CHAINED(reg)) {
5938 LIST_REMOVE(reg, chain);
5939 KFREE(reg);
5940 break;
5941 }
5942 }
5943 }
5944
5945 return;
5946 }
5947
5948 /*
5949 * SADB_EXPIRE processing
5950 * send
5951 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
5952 * to KMD by PF_KEY.
5953 * NOTE: We send only soft lifetime extension.
5954 *
5955 * OUT: 0 : succeed
5956 * others : error number
5957 */
5958 static int
5959 key_expire(struct secasvar *sav)
5960 {
5961
5962 int satype;
5963 struct mbuf *result = NULL, *m;
5964 int len;
5965 int error = -1;
5966 struct sadb_lifetime *lt;
5967
5968 /* XXX: Why do we lock ? */
5969 crit_enter();
5970
5971 /* sanity check */
5972 if (sav == NULL)
5973 panic("key_expire: NULL pointer is passed.\n");
5974 if (sav->sah == NULL)
5975 panic("key_expire: Why was SA index in SA NULL.\n");
5976 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0)
5977 panic("key_expire: invalid proto is passed.\n");
5978
5979 /* set msg header */
5980 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
5981 if (!m) {
5982 error = ENOBUFS;
5983 goto fail;
5984 }
5985 result = m;
5986
5987 /* create SA extension */
5988 m = key_setsadbsa(sav);
5989 if (!m) {
5990 error = ENOBUFS;
5991 goto fail;
5992 }
5993 m_cat(result, m);
5994
5995 /* create SA extension */
5996 m = key_setsadbxsa2(sav->sah->saidx.mode,
5997 sav->replay ? sav->replay->count : 0,
5998 sav->sah->saidx.reqid);
5999 if (!m) {
6000 error = ENOBUFS;
6001 goto fail;
6002 }
6003 m_cat(result, m);
6004
6005 /* create lifetime extension (current and soft) */
6006 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
6007 m = key_alloc_mbuf(len);
6008 if (!m || m->m_next) { /*XXX*/
6009 if (m)
6010 m_freem(m);
6011 error = ENOBUFS;
6012 goto fail;
6013 }
6014 bzero(mtod(m, caddr_t), len);
6015 lt = mtod(m, struct sadb_lifetime *);
6016 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
6017 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
6018 lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations;
6019 lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes;
6020 lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime;
6021 lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime;
6022 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
6023 bcopy(sav->lft_s, lt, sizeof(*lt));
6024 m_cat(result, m);
6025
6026 /* set sadb_address for source */
6027 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
6028 &sav->sah->saidx.src.sa,
6029 FULLMASK, IPSEC_ULPROTO_ANY);
6030 if (!m) {
6031 error = ENOBUFS;
6032 goto fail;
6033 }
6034 m_cat(result, m);
6035
6036 /* set sadb_address for destination */
6037 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
6038 &sav->sah->saidx.dst.sa,
6039 FULLMASK, IPSEC_ULPROTO_ANY);
6040 if (!m) {
6041 error = ENOBUFS;
6042 goto fail;
6043 }
6044 m_cat(result, m);
6045
6046 if ((result->m_flags & M_PKTHDR) == 0) {
6047 error = EINVAL;
6048 goto fail;
6049 }
6050
6051 if (result->m_len < sizeof(struct sadb_msg)) {
6052 result = m_pullup(result, sizeof(struct sadb_msg));
6053 if (result == NULL) {
6054 error = ENOBUFS;
6055 goto fail;
6056 }
6057 }
6058 result->m_pkthdr.len = m_lengthm(result, NULL);
6059 mtod(result, struct sadb_msg *)->sadb_msg_len =
6060 PFKEY_UNIT64(result->m_pkthdr.len);
6061
6062 crit_exit();
6063 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6064
6065 fail:
6066 if (result)
6067 m_freem(result);
6068 crit_exit();
6069 return error;
6070 }
6071
6072 /*
6073 * SADB_FLUSH processing
6074 * receive
6075 * <base>
6076 * from the ikmpd, and free all entries in secastree.
6077 * and send,
6078 * <base>
6079 * to the ikmpd.
6080 * NOTE: to do is only marking SADB_SASTATE_DEAD.
6081 *
6082 * m will always be freed.
6083 */
6084 static int
6085 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6086 {
6087 struct sadb_msg *newmsg;
6088 struct secashead *sah;
6089 u_int16_t proto;
6090 u_int stateidx;
6091
6092 /* sanity check */
6093 if (so == NULL || mhp == NULL || mhp->msg == NULL)
6094 panic("key_flush: NULL pointer is passed.\n");
6095
6096 /* map satype to proto */
6097 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6098 ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n"));
6099 return key_senderror(so, m, EINVAL);
6100 }
6101
6102 /* no SATYPE specified, i.e. flushing all SA. */
6103 LIST_FOREACH(sah, &sahtree, chain) {
6104 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
6105 proto != sah->saidx.proto)
6106 continue;
6107
6108 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive);
6109 stateidx++) {
6110 struct secasvar *sav, *nextsav;
6111 u_int8_t state = saorder_state_any[stateidx];
6112
6113 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain,
6114 nextsav) {
6115 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
6116 KEY_FREESAV(&sav);
6117 }
6118 }
6119
6120 sah->state = SADB_SASTATE_DEAD;
6121 }
6122
6123 if (m->m_len < sizeof(struct sadb_msg) ||
6124 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
6125 ipseclog((LOG_DEBUG, "key_flush: No more memory.\n"));
6126 return key_senderror(so, m, ENOBUFS);
6127 }
6128
6129 if (m->m_next)
6130 m_freem(m->m_next);
6131 m->m_next = NULL;
6132 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
6133 newmsg = mtod(m, struct sadb_msg *);
6134 newmsg->sadb_msg_errno = 0;
6135 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
6136
6137 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6138 }
6139
6140 /*
6141 * SADB_DUMP processing
6142 * dump all entries including status of DEAD in SAD.
6143 * receive
6144 * <base>
6145 * from the ikmpd, and dump all secasvar leaves
6146 * and send,
6147 * <base> .....
6148 * to the ikmpd.
6149 *
6150 * m will always be freed.
6151 */
6152 static int
6153 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6154 {
6155 struct secashead *sah;
6156 struct secasvar *sav;
6157 u_int16_t proto;
6158 u_int stateidx;
6159 u_int8_t satype;
6160 u_int8_t state;
6161 int cnt;
6162 struct sadb_msg *newmsg;
6163 struct mbuf *n;
6164
6165 /* sanity check */
6166 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6167 panic("key_dump: NULL pointer is passed.\n");
6168
6169 /* map satype to proto */
6170 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6171 ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n"));
6172 return key_senderror(so, m, EINVAL);
6173 }
6174
6175 /* count sav entries to be sent to the userland. */
6176 cnt = 0;
6177 LIST_FOREACH(sah, &sahtree, chain) {
6178 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
6179 proto != sah->saidx.proto)
6180 continue;
6181
6182 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any);
6183 stateidx++) {
6184 state = saorder_state_any[stateidx];
6185 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6186 cnt++;
6187 }
6188 }
6189 }
6190
6191 if (cnt == 0)
6192 return key_senderror(so, m, ENOENT);
6193
6194 /* send this to the userland, one at a time. */
6195 newmsg = NULL;
6196 LIST_FOREACH(sah, &sahtree, chain) {
6197 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6198 && proto != sah->saidx.proto)
6199 continue;
6200
6201 /* map proto to satype */
6202 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
6203 ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in SAD.\n"));
6204 return key_senderror(so, m, EINVAL);
6205 }
6206
6207 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any);
6208 stateidx++) {
6209 state = saorder_state_any[stateidx];
6210 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6211 n = key_setdumpsa(sav, SADB_DUMP, satype,
6212 --cnt, mhp->msg->sadb_msg_pid);
6213 if (!n)
6214 return key_senderror(so, m, ENOBUFS);
6215
6216 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6217 }
6218 }
6219 }
6220
6221 m_freem(m);
6222 return 0;
6223 }
6224
6225 /*
6226 * SADB_X_PROMISC processing
6227 *
6228 * m will always be freed.
6229 */
6230 static int
6231 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6232 {
6233 int olen;
6234
6235 /* sanity check */
6236 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6237 panic("key_promisc: NULL pointer is passed.\n");
6238
6239 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6240
6241 if (olen < sizeof(struct sadb_msg)) {
6242 #if 1
6243 return key_senderror(so, m, EINVAL);
6244 #else
6245 m_freem(m);
6246 return 0;
6247 #endif
6248 } else if (olen == sizeof(struct sadb_msg)) {
6249 /* enable/disable promisc mode */
6250 struct keycb *kp;
6251
6252 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
6253 return key_senderror(so, m, EINVAL);
6254 mhp->msg->sadb_msg_errno = 0;
6255 switch (mhp->msg->sadb_msg_satype) {
6256 case 0:
6257 case 1:
6258 kp->kp_promisc = mhp->msg->sadb_msg_satype;
6259 break;
6260 default:
6261 return key_senderror(so, m, EINVAL);
6262 }
6263
6264 /* send the original message back to everyone */
6265 mhp->msg->sadb_msg_errno = 0;
6266 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6267 } else {
6268 /* send packet as is */
6269
6270 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
6271
6272 /* TODO: if sadb_msg_seq is specified, send to specific pid */
6273 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6274 }
6275 }
6276
6277 static int (*key_typesw[]) (struct socket *, struct mbuf *,
6278 const struct sadb_msghdr *) = {
6279 NULL, /* SADB_RESERVED */
6280 key_getspi, /* SADB_GETSPI */
6281 key_update, /* SADB_UPDATE */
6282 key_add, /* SADB_ADD */
6283 key_delete, /* SADB_DELETE */
6284 key_get, /* SADB_GET */
6285 key_acquire2, /* SADB_ACQUIRE */
6286 key_register, /* SADB_REGISTER */
6287 NULL, /* SADB_EXPIRE */
6288 key_flush, /* SADB_FLUSH */
6289 key_dump, /* SADB_DUMP */
6290 key_promisc, /* SADB_X_PROMISC */
6291 NULL, /* SADB_X_PCHANGE */
6292 key_spdadd, /* SADB_X_SPDUPDATE */
6293 key_spdadd, /* SADB_X_SPDADD */
6294 key_spddelete, /* SADB_X_SPDDELETE */
6295 key_spdget, /* SADB_X_SPDGET */
6296 NULL, /* SADB_X_SPDACQUIRE */
6297 key_spddump, /* SADB_X_SPDDUMP */
6298 key_spdflush, /* SADB_X_SPDFLUSH */
6299 key_spdadd, /* SADB_X_SPDSETIDX */
6300 NULL, /* SADB_X_SPDEXPIRE */
6301 key_spddelete2, /* SADB_X_SPDDELETE2 */
6302 };
6303
6304 /*
6305 * parse sadb_msg buffer to process PFKEYv2,
6306 * and create a data to response if needed.
6307 * I think to be dealed with mbuf directly.
6308 * IN:
6309 * msgp : pointer to pointer to a received buffer pulluped.
6310 * This is rewrited to response.
6311 * so : pointer to socket.
6312 * OUT:
6313 * length for buffer to send to user process.
6314 */
6315 int
6316 key_parse(struct mbuf *m, struct socket *so)
6317 {
6318 struct sadb_msg *msg;
6319 struct sadb_msghdr mh;
6320 u_int orglen;
6321 int error;
6322 int target;
6323
6324 /* sanity check */
6325 if (m == NULL || so == NULL)
6326 panic("key_parse: NULL pointer is passed.\n");
6327
6328 #if 0 /*kdebug_sadb assumes msg in linear buffer*/
6329 KEYDEBUG(KEYDEBUG_KEY_DUMP,
6330 ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n"));
6331 kdebug_sadb(msg));
6332 #endif
6333
6334 if (m->m_len < sizeof(struct sadb_msg)) {
6335 m = m_pullup(m, sizeof(struct sadb_msg));
6336 if (!m)
6337 return ENOBUFS;
6338 }
6339 msg = mtod(m, struct sadb_msg *);
6340 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
6341 target = KEY_SENDUP_ONE;
6342
6343 if ((m->m_flags & M_PKTHDR) == 0 ||
6344 m->m_pkthdr.len != m->m_pkthdr.len) {
6345 ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n"));
6346 pfkeystat.out_invlen++;
6347 error = EINVAL;
6348 goto senderror;
6349 }
6350
6351 if (msg->sadb_msg_version != PF_KEY_V2) {
6352 ipseclog((LOG_DEBUG,
6353 "key_parse: PF_KEY version %u is mismatched.\n",
6354 msg->sadb_msg_version));
6355 pfkeystat.out_invver++;
6356 error = EINVAL;
6357 goto senderror;
6358 }
6359
6360 if (msg->sadb_msg_type > SADB_MAX) {
6361 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6362 msg->sadb_msg_type));
6363 pfkeystat.out_invmsgtype++;
6364 error = EINVAL;
6365 goto senderror;
6366 }
6367
6368 /* for old-fashioned code - should be nuked */
6369 if (m->m_pkthdr.len > MCLBYTES) {
6370 m_freem(m);
6371 return ENOBUFS;
6372 }
6373 if (m->m_next) {
6374 struct mbuf *n;
6375
6376 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
6377 if (!n) {
6378 m_freem(m);
6379 return ENOBUFS;
6380 }
6381 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
6382 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
6383 m_freem(m);
6384 m = n;
6385 }
6386
6387 /* align the mbuf chain so that extensions are in contiguous region. */
6388 error = key_align(m, &mh);
6389 if (error)
6390 return error;
6391
6392 msg = mh.msg;
6393
6394 /* check SA type */
6395 switch (msg->sadb_msg_satype) {
6396 case SADB_SATYPE_UNSPEC:
6397 switch (msg->sadb_msg_type) {
6398 case SADB_GETSPI:
6399 case SADB_UPDATE:
6400 case SADB_ADD:
6401 case SADB_DELETE:
6402 case SADB_GET:
6403 case SADB_ACQUIRE:
6404 case SADB_EXPIRE:
6405 ipseclog((LOG_DEBUG, "key_parse: must specify satype "
6406 "when msg type=%u.\n", msg->sadb_msg_type));
6407 pfkeystat.out_invsatype++;
6408 error = EINVAL;
6409 goto senderror;
6410 }
6411 break;
6412 case SADB_SATYPE_AH:
6413 case SADB_SATYPE_ESP:
6414 case SADB_X_SATYPE_IPCOMP:
6415 switch (msg->sadb_msg_type) {
6416 case SADB_X_SPDADD:
6417 case SADB_X_SPDDELETE:
6418 case SADB_X_SPDGET:
6419 case SADB_X_SPDDUMP:
6420 case SADB_X_SPDFLUSH:
6421 case SADB_X_SPDSETIDX:
6422 case SADB_X_SPDUPDATE:
6423 case SADB_X_SPDDELETE2:
6424 ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n",
6425 msg->sadb_msg_type));
6426 pfkeystat.out_invsatype++;
6427 error = EINVAL;
6428 goto senderror;
6429 }
6430 break;
6431 case SADB_SATYPE_RSVP:
6432 case SADB_SATYPE_OSPFV2:
6433 case SADB_SATYPE_RIPV2:
6434 case SADB_SATYPE_MIP:
6435 ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n",
6436 msg->sadb_msg_satype));
6437 pfkeystat.out_invsatype++;
6438 error = EOPNOTSUPP;
6439 goto senderror;
6440 case 1: /* XXX: What does it do? */
6441 if (msg->sadb_msg_type == SADB_X_PROMISC)
6442 break;
6443 /*FALLTHROUGH*/
6444 default:
6445 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6446 msg->sadb_msg_satype));
6447 pfkeystat.out_invsatype++;
6448 error = EINVAL;
6449 goto senderror;
6450 }
6451
6452 /* check field of upper layer protocol and address family */
6453 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
6454 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
6455 struct sadb_address *src0, *dst0;
6456 u_int plen;
6457
6458 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
6459 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
6460
6461 /* check upper layer protocol */
6462 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
6463 ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n"));
6464 pfkeystat.out_invaddr++;
6465 error = EINVAL;
6466 goto senderror;
6467 }
6468
6469 /* check family */
6470 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
6471 PFKEY_ADDR_SADDR(dst0)->sa_family) {
6472 ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n"));
6473 pfkeystat.out_invaddr++;
6474 error = EINVAL;
6475 goto senderror;
6476 }
6477 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6478 PFKEY_ADDR_SADDR(dst0)->sa_len) {
6479 ipseclog((LOG_DEBUG,
6480 "key_parse: address struct size mismatched.\n"));
6481 pfkeystat.out_invaddr++;
6482 error = EINVAL;
6483 goto senderror;
6484 }
6485
6486 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6487 case AF_INET:
6488 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6489 sizeof(struct sockaddr_in)) {
6490 pfkeystat.out_invaddr++;
6491 error = EINVAL;
6492 goto senderror;
6493 }
6494 break;
6495 case AF_INET6:
6496 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6497 sizeof(struct sockaddr_in6)) {
6498 pfkeystat.out_invaddr++;
6499 error = EINVAL;
6500 goto senderror;
6501 }
6502 break;
6503 default:
6504 ipseclog((LOG_DEBUG,
6505 "key_parse: unsupported address family.\n"));
6506 pfkeystat.out_invaddr++;
6507 error = EAFNOSUPPORT;
6508 goto senderror;
6509 }
6510
6511 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6512 case AF_INET:
6513 plen = sizeof(struct in_addr) << 3;
6514 break;
6515 case AF_INET6:
6516 plen = sizeof(struct in6_addr) << 3;
6517 break;
6518 default:
6519 plen = 0; /*fool gcc*/
6520 break;
6521 }
6522
6523 /* check max prefix length */
6524 if (src0->sadb_address_prefixlen > plen ||
6525 dst0->sadb_address_prefixlen > plen) {
6526 ipseclog((LOG_DEBUG,
6527 "key_parse: illegal prefixlen.\n"));
6528 pfkeystat.out_invaddr++;
6529 error = EINVAL;
6530 goto senderror;
6531 }
6532
6533 /*
6534 * prefixlen == 0 is valid because there can be a case when
6535 * all addresses are matched.
6536 */
6537 }
6538
6539 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
6540 key_typesw[msg->sadb_msg_type] == NULL) {
6541 pfkeystat.out_invmsgtype++;
6542 error = EINVAL;
6543 goto senderror;
6544 }
6545
6546 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
6547
6548 senderror:
6549 msg->sadb_msg_errno = error;
6550 return key_sendup_mbuf(so, m, target);
6551 }
6552
6553 static int
6554 key_senderror(struct socket *so, struct mbuf *m, int code)
6555 {
6556 struct sadb_msg *msg;
6557
6558 if (m->m_len < sizeof(struct sadb_msg))
6559 panic("invalid mbuf passed to key_senderror");
6560
6561 msg = mtod(m, struct sadb_msg *);
6562 msg->sadb_msg_errno = code;
6563 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
6564 }
6565
6566 /*
6567 * set the pointer to each header into message buffer.
6568 * m will be freed on error.
6569 * XXX larger-than-MCLBYTES extension?
6570 */
6571 static int
6572 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
6573 {
6574 struct mbuf *n;
6575 struct sadb_ext *ext;
6576 size_t off, end;
6577 int extlen;
6578 int toff;
6579
6580 /* sanity check */
6581 if (m == NULL || mhp == NULL)
6582 panic("key_align: NULL pointer is passed.\n");
6583 if (m->m_len < sizeof(struct sadb_msg))
6584 panic("invalid mbuf passed to key_align");
6585
6586 /* initialize */
6587 bzero(mhp, sizeof(*mhp));
6588
6589 mhp->msg = mtod(m, struct sadb_msg *);
6590 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
6591
6592 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6593 extlen = end; /*just in case extlen is not updated*/
6594 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
6595 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
6596 if (!n) {
6597 /* m is already freed */
6598 return ENOBUFS;
6599 }
6600 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6601
6602 /* set pointer */
6603 switch (ext->sadb_ext_type) {
6604 case SADB_EXT_SA:
6605 case SADB_EXT_ADDRESS_SRC:
6606 case SADB_EXT_ADDRESS_DST:
6607 case SADB_EXT_ADDRESS_PROXY:
6608 case SADB_EXT_LIFETIME_CURRENT:
6609 case SADB_EXT_LIFETIME_HARD:
6610 case SADB_EXT_LIFETIME_SOFT:
6611 case SADB_EXT_KEY_AUTH:
6612 case SADB_EXT_KEY_ENCRYPT:
6613 case SADB_EXT_IDENTITY_SRC:
6614 case SADB_EXT_IDENTITY_DST:
6615 case SADB_EXT_SENSITIVITY:
6616 case SADB_EXT_PROPOSAL:
6617 case SADB_EXT_SUPPORTED_AUTH:
6618 case SADB_EXT_SUPPORTED_ENCRYPT:
6619 case SADB_EXT_SPIRANGE:
6620 case SADB_X_EXT_POLICY:
6621 case SADB_X_EXT_SA2:
6622 /* duplicate check */
6623 /*
6624 * XXX Are there duplication payloads of either
6625 * KEY_AUTH or KEY_ENCRYPT ?
6626 */
6627 if (mhp->ext[ext->sadb_ext_type] != NULL) {
6628 ipseclog((LOG_DEBUG,
6629 "key_align: duplicate ext_type %u "
6630 "is passed.\n", ext->sadb_ext_type));
6631 m_freem(m);
6632 pfkeystat.out_dupext++;
6633 return EINVAL;
6634 }
6635 break;
6636 default:
6637 ipseclog((LOG_DEBUG,
6638 "key_align: invalid ext_type %u is passed.\n",
6639 ext->sadb_ext_type));
6640 m_freem(m);
6641 pfkeystat.out_invexttype++;
6642 return EINVAL;
6643 }
6644
6645 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
6646
6647 if (key_validate_ext(ext, extlen)) {
6648 m_freem(m);
6649 pfkeystat.out_invlen++;
6650 return EINVAL;
6651 }
6652
6653 n = m_pulldown(m, off, extlen, &toff);
6654 if (!n) {
6655 /* m is already freed */
6656 return ENOBUFS;
6657 }
6658 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6659
6660 mhp->ext[ext->sadb_ext_type] = ext;
6661 mhp->extoff[ext->sadb_ext_type] = off;
6662 mhp->extlen[ext->sadb_ext_type] = extlen;
6663 }
6664
6665 if (off != end) {
6666 m_freem(m);
6667 pfkeystat.out_invlen++;
6668 return EINVAL;
6669 }
6670
6671 return 0;
6672 }
6673
6674 static int
6675 key_validate_ext(const struct sadb_ext *ext, int len)
6676 {
6677 const struct sockaddr *sa;
6678 enum { NONE, ADDR } checktype = NONE;
6679 int baselen = 0;
6680 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
6681
6682 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
6683 return EINVAL;
6684
6685 /* if it does not match minimum/maximum length, bail */
6686 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
6687 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
6688 return EINVAL;
6689 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
6690 return EINVAL;
6691 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
6692 return EINVAL;
6693
6694 /* more checks based on sadb_ext_type XXX need more */
6695 switch (ext->sadb_ext_type) {
6696 case SADB_EXT_ADDRESS_SRC:
6697 case SADB_EXT_ADDRESS_DST:
6698 case SADB_EXT_ADDRESS_PROXY:
6699 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
6700 checktype = ADDR;
6701 break;
6702 case SADB_EXT_IDENTITY_SRC:
6703 case SADB_EXT_IDENTITY_DST:
6704 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
6705 SADB_X_IDENTTYPE_ADDR) {
6706 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
6707 checktype = ADDR;
6708 } else
6709 checktype = NONE;
6710 break;
6711 default:
6712 checktype = NONE;
6713 break;
6714 }
6715
6716 switch (checktype) {
6717 case NONE:
6718 break;
6719 case ADDR:
6720 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
6721 if (len < baselen + sal)
6722 return EINVAL;
6723 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
6724 return EINVAL;
6725 break;
6726 }
6727
6728 return 0;
6729 }
6730
6731 void
6732 key_init(void)
6733 {
6734 int i;
6735
6736 for (i = 0; i < IPSEC_DIR_MAX; i++) {
6737 LIST_INIT(&sptree[i]);
6738 }
6739
6740 LIST_INIT(&sahtree);
6741
6742 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
6743 LIST_INIT(&regtree[i]);
6744 }
6745
6746 #ifndef IPSEC_NONBLOCK_ACQUIRE
6747 LIST_INIT(&acqtree);
6748 #endif
6749 LIST_INIT(&spacqtree);
6750
6751 /* system default */
6752 ip4_def_policy.policy = IPSEC_POLICY_NONE;
6753 ip4_def_policy.refcnt++; /*never reclaim this*/
6754
6755 #ifndef IPSEC_DEBUG2
6756 callout_init(&key_timehandler_ch);
6757 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL);
6758 #endif /*IPSEC_DEBUG2*/
6759
6760 /* initialize key statistics */
6761 keystat.getspi_count = 1;
6762
6763 kprintf("IPsec: Initialized Security Association Processing.\n");
6764
6765 return;
6766 }
6767
6768 /*
6769 * XXX: maybe This function is called after INBOUND IPsec processing.
6770 *
6771 * Special check for tunnel-mode packets.
6772 * We must make some checks for consistency between inner and outer IP header.
6773 *
6774 * xxx more checks to be provided
6775 */
6776 int
6777 key_checktunnelsanity(struct secasvar *sav, u_int family, caddr_t src,
6778 caddr_t dst)
6779 {
6780 /* sanity check */
6781 if (sav->sah == NULL)
6782 panic("sav->sah == NULL at key_checktunnelsanity");
6783
6784 /* XXX: check inner IP header */
6785
6786 return 1;
6787 }
6788
6789 #if 0
6790 #define hostnamelen strlen(hostname)
6791
6792 /*
6793 * Get FQDN for the host.
6794 * If the administrator configured hostname (by hostname(1)) without
6795 * domain name, returns nothing.
6796 */
6797 static const char *
6798 key_getfqdn(void)
6799 {
6800 int i;
6801 int hasdot;
6802 static char fqdn[MAXHOSTNAMELEN + 1];
6803
6804 if (!hostnamelen)
6805 return NULL;
6806
6807 /* check if it comes with domain name. */
6808 hasdot = 0;
6809 for (i = 0; i < hostnamelen; i++) {
6810 if (hostname[i] == '.')
6811 hasdot++;
6812 }
6813 if (!hasdot)
6814 return NULL;
6815
6816 /* NOTE: hostname may not be NUL-terminated. */
6817 bzero(fqdn, sizeof(fqdn));
6818 bcopy(hostname, fqdn, hostnamelen);
6819 fqdn[hostnamelen] = '\0';
6820 return fqdn;
6821 }
6822
6823 /*
6824 * get username@FQDN for the host/user.
6825 */
6826 static const char *
6827 key_getuserfqdn(void)
6828 {
6829 const char *host;
6830 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2];
6831 struct proc *p = curproc;
6832 char *q;
6833
6834 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session)
6835 return NULL;
6836 if (!(host = key_getfqdn()))
6837 return NULL;
6838
6839 /* NOTE: s_login may not be-NUL terminated. */
6840 bzero(userfqdn, sizeof(userfqdn));
6841 bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME);
6842 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */
6843 q = userfqdn + strlen(userfqdn);
6844 *q++ = '@';
6845 bcopy(host, q, strlen(host));
6846 q += strlen(host);
6847 *q++ = '\0';
6848
6849 return userfqdn;
6850 }
6851 #endif
6852
6853 /* record data transfer on SA, and update timestamps */
6854 void
6855 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
6856 {
6857 KASSERT(sav != NULL, ("key_sa_recordxfer: Null secasvar"));
6858 KASSERT(m != NULL, ("key_sa_recordxfer: Null mbuf"));
6859 if (!sav->lft_c)
6860 return;
6861
6862 /*
6863 * XXX Currently, there is a difference of bytes size
6864 * between inbound and outbound processing.
6865 */
6866 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len;
6867 /* to check bytes lifetime is done in key_timehandler(). */
6868
6869 /*
6870 * We use the number of packets as the unit of
6871 * sadb_lifetime_allocations. We increment the variable
6872 * whenever {esp,ah}_{in,out}put is called.
6873 */
6874 sav->lft_c->sadb_lifetime_allocations++;
6875 /* XXX check for expires? */
6876
6877 /*
6878 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock,
6879 * in seconds. HARD and SOFT lifetime are measured by the time
6880 * difference (again in seconds) from sadb_lifetime_usetime.
6881 *
6882 * usetime
6883 * v expire expire
6884 * -----+-----+--------+---> t
6885 * <--------------> HARD
6886 * <-----> SOFT
6887 */
6888 sav->lft_c->sadb_lifetime_usetime = time_second;
6889 /* XXX check for expires? */
6890
6891 return;
6892 }
6893
6894 /* dumb version */
6895 void
6896 key_sa_routechange(struct sockaddr *dst)
6897 {
6898 struct secashead *sah;
6899 struct route *ro;
6900
6901 LIST_FOREACH(sah, &sahtree, chain) {
6902 ro = &sah->sa_route;
6903 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len
6904 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
6905 RTFREE(ro->ro_rt);
6906 ro->ro_rt = NULL;
6907 }
6908 }
6909
6910 return;
6911 }
6912
6913 static void
6914 key_sa_chgstate(struct secasvar *sav, u_int8_t state)
6915 {
6916 if (sav == NULL)
6917 panic("key_sa_chgstate called with sav == NULL");
6918
6919 if (sav->state == state)
6920 return;
6921
6922 if (__LIST_CHAINED(sav))
6923 LIST_REMOVE(sav, chain);
6924
6925 sav->state = state;
6926 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
6927 }
6928
6929 void
6930 key_sa_stir_iv(struct secasvar *sav)
6931 {
6932
6933 if (!sav->iv)
6934 panic("key_sa_stir_iv called with sav == NULL");
6935 key_randomfill(sav->iv, sav->ivlen);
6936 }
6937
6938 /* XXX too much? */
6939 static struct mbuf *
6940 key_alloc_mbuf(int l)
6941 {
6942 struct mbuf *m = NULL, *n;
6943 int len, t;
6944
6945 len = l;
6946 while (len > 0) {
6947 n = m_getb(len, MB_DONTWAIT, MT_DATA, 0);
6948 if (!n) {
6949 m_freem(m);
6950 return NULL;
6951 }
6952 n->m_len = 0;
6953 n->m_len = M_TRAILINGSPACE(n);
6954 /* use the bottom of mbuf, hoping we can prepend afterwards */
6955 if (n->m_len > len) {
6956 t = (n->m_len - len) & ~(sizeof(long) - 1);
6957 n->m_data += t;
6958 n->m_len = len;
6959 }
6960
6961 len -= n->m_len;
6962
6963 if (m)
6964 m_cat(m, n);
6965 else
6966 m = n;
6967 }
6968
6969 return m;
6970 }
DragonFly BSD