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Add moscom(4) - the driver for MosChip Semiconductor MCS7703 USB to
[dragonfly.git] / sys / netproto / ipsec / key.c
bloba6fc2cf6f0db25c440cdf51e21b81c173e1b04bc
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 1.25 2007/05/13 18:33:58 swildner 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 = (struct rtentry *)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 *ia;
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(ia, &in_ifaddrhead, ia_link) {
3521 if (sin->sin_family == ia->ia_addr.sin_family &&
3522 sin->sin_len == ia->ia_addr.sin_len &&
3523 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
3524 {
3525 return 1;
3526 }
3527 }
3528 break;
3529 #endif
3530 #ifdef INET6
3531 case AF_INET6:
3532 return key_ismyaddr6((struct sockaddr_in6 *)sa);
3533 #endif
3534 }
3535
3536 return 0;
3537 }
3538
3539 #ifdef INET6
3540 /*
3541 * compare my own address for IPv6.
3542 * 1: ours
3543 * 0: other
3544 * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
3545 */
3546 #include <netinet6/in6_var.h>
3547
3548 static int
3549 key_ismyaddr6(struct sockaddr_in6 *sin6)
3550 {
3551 struct in6_ifaddr *ia;
3552 struct in6_multi *in6m;
3553
3554 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
3555 if (key_sockaddrcmp((struct sockaddr *)&sin6,
3556 (struct sockaddr *)&ia->ia_addr, 0) == 0)
3557 return 1;
3558
3559 /*
3560 * XXX Multicast
3561 * XXX why do we care about multlicast here while we don't care
3562 * about IPv4 multicast??
3563 * XXX scope
3564 */
3565 in6m = NULL;
3566 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
3567 if (in6m)
3568 return 1;
3569 }
3570
3571 /* loopback, just for safety */
3572 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
3573 return 1;
3574
3575 return 0;
3576 }
3577 #endif /*INET6*/
3578
3579 /*
3580 * compare two secasindex structure.
3581 * flag can specify to compare 2 saidxes.
3582 * compare two secasindex structure without both mode and reqid.
3583 * don't compare port.
3584 * IN:
3585 * saidx0: source, it can be in SAD.
3586 * saidx1: object.
3587 * OUT:
3588 * 1 : equal
3589 * 0 : not equal
3590 */
3591 static int
3592 key_cmpsaidx(
3593 const struct secasindex *saidx0,
3594 const struct secasindex *saidx1,
3595 int flag)
3596 {
3597 /* sanity */
3598 if (saidx0 == NULL && saidx1 == NULL)
3599 return 1;
3600
3601 if (saidx0 == NULL || saidx1 == NULL)
3602 return 0;
3603
3604 if (saidx0->proto != saidx1->proto)
3605 return 0;
3606
3607 if (flag == CMP_EXACTLY) {
3608 if (saidx0->mode != saidx1->mode)
3609 return 0;
3610 if (saidx0->reqid != saidx1->reqid)
3611 return 0;
3612 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 ||
3613 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0)
3614 return 0;
3615 } else {
3616
3617 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */
3618 if (flag == CMP_MODE_REQID
3619 ||flag == CMP_REQID) {
3620 /*
3621 * If reqid of SPD is non-zero, unique SA is required.
3622 * The result must be of same reqid in this case.
3623 */
3624 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid)
3625 return 0;
3626 }
3627
3628 if (flag == CMP_MODE_REQID) {
3629 if (saidx0->mode != IPSEC_MODE_ANY
3630 && saidx0->mode != saidx1->mode)
3631 return 0;
3632 }
3633
3634 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) {
3635 return 0;
3636 }
3637 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) {
3638 return 0;
3639 }
3640 }
3641
3642 return 1;
3643 }
3644
3645 /*
3646 * compare two secindex structure exactly.
3647 * IN:
3648 * spidx0: source, it is often in SPD.
3649 * spidx1: object, it is often from PFKEY message.
3650 * OUT:
3651 * 1 : equal
3652 * 0 : not equal
3653 */
3654 static int
3655 key_cmpspidx_exactly(
3656 struct secpolicyindex *spidx0,
3657 struct secpolicyindex *spidx1)
3658 {
3659 /* sanity */
3660 if (spidx0 == NULL && spidx1 == NULL)
3661 return 1;
3662
3663 if (spidx0 == NULL || spidx1 == NULL)
3664 return 0;
3665
3666 if (spidx0->prefs != spidx1->prefs
3667 || spidx0->prefd != spidx1->prefd
3668 || spidx0->ul_proto != spidx1->ul_proto)
3669 return 0;
3670
3671 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 &&
3672 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0;
3673 }
3674
3675 /*
3676 * compare two secindex structure with mask.
3677 * IN:
3678 * spidx0: source, it is often in SPD.
3679 * spidx1: object, it is often from IP header.
3680 * OUT:
3681 * 1 : equal
3682 * 0 : not equal
3683 */
3684 static int
3685 key_cmpspidx_withmask(
3686 struct secpolicyindex *spidx0,
3687 struct secpolicyindex *spidx1)
3688 {
3689 /* sanity */
3690 if (spidx0 == NULL && spidx1 == NULL)
3691 return 1;
3692
3693 if (spidx0 == NULL || spidx1 == NULL)
3694 return 0;
3695
3696 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family ||
3697 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family ||
3698 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len ||
3699 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len)
3700 return 0;
3701
3702 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */
3703 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY
3704 && spidx0->ul_proto != spidx1->ul_proto)
3705 return 0;
3706
3707 switch (spidx0->src.sa.sa_family) {
3708 case AF_INET:
3709 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY
3710 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port)
3711 return 0;
3712 if (!key_bbcmp(&spidx0->src.sin.sin_addr,
3713 &spidx1->src.sin.sin_addr, spidx0->prefs))
3714 return 0;
3715 break;
3716 case AF_INET6:
3717 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY
3718 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port)
3719 return 0;
3720 /*
3721 * scope_id check. if sin6_scope_id is 0, we regard it
3722 * as a wildcard scope, which matches any scope zone ID.
3723 */
3724 if (spidx0->src.sin6.sin6_scope_id &&
3725 spidx1->src.sin6.sin6_scope_id &&
3726 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id)
3727 return 0;
3728 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr,
3729 &spidx1->src.sin6.sin6_addr, spidx0->prefs))
3730 return 0;
3731 break;
3732 default:
3733 /* XXX */
3734 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0)
3735 return 0;
3736 break;
3737 }
3738
3739 switch (spidx0->dst.sa.sa_family) {
3740 case AF_INET:
3741 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY
3742 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port)
3743 return 0;
3744 if (!key_bbcmp(&spidx0->dst.sin.sin_addr,
3745 &spidx1->dst.sin.sin_addr, spidx0->prefd))
3746 return 0;
3747 break;
3748 case AF_INET6:
3749 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY
3750 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port)
3751 return 0;
3752 /*
3753 * scope_id check. if sin6_scope_id is 0, we regard it
3754 * as a wildcard scope, which matches any scope zone ID.
3755 */
3756 if (spidx0->dst.sin6.sin6_scope_id &&
3757 spidx1->dst.sin6.sin6_scope_id &&
3758 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id)
3759 return 0;
3760 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr,
3761 &spidx1->dst.sin6.sin6_addr, spidx0->prefd))
3762 return 0;
3763 break;
3764 default:
3765 /* XXX */
3766 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0)
3767 return 0;
3768 break;
3769 }
3770
3771 /* XXX Do we check other field ? e.g. flowinfo */
3772
3773 return 1;
3774 }
3775
3776 /* returns 0 on match */
3777 static int
3778 key_sockaddrcmp(
3779 const struct sockaddr *sa1,
3780 const struct sockaddr *sa2,
3781 int port)
3782 {
3783 #ifdef satosin
3784 #undef satosin
3785 #endif
3786 #define satosin(s) ((const struct sockaddr_in *)s)
3787 #ifdef satosin6
3788 #undef satosin6
3789 #endif
3790 #define satosin6(s) ((const struct sockaddr_in6 *)s)
3791 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len)
3792 return 1;
3793
3794 switch (sa1->sa_family) {
3795 case AF_INET:
3796 if (sa1->sa_len != sizeof(struct sockaddr_in))
3797 return 1;
3798 if (satosin(sa1)->sin_addr.s_addr !=
3799 satosin(sa2)->sin_addr.s_addr) {
3800 return 1;
3801 }
3802 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port)
3803 return 1;
3804 break;
3805 case AF_INET6:
3806 if (sa1->sa_len != sizeof(struct sockaddr_in6))
3807 return 1; /*EINVAL*/
3808 if (satosin6(sa1)->sin6_scope_id !=
3809 satosin6(sa2)->sin6_scope_id) {
3810 return 1;
3811 }
3812 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr,
3813 &satosin6(sa2)->sin6_addr)) {
3814 return 1;
3815 }
3816 if (port &&
3817 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) {
3818 return 1;
3819 }
3820 default:
3821 if (bcmp(sa1, sa2, sa1->sa_len) != 0)
3822 return 1;
3823 break;
3824 }
3825
3826 return 0;
3827 #undef satosin
3828 #undef satosin6
3829 }
3830
3831 /*
3832 * compare two buffers with mask.
3833 * IN:
3834 * addr1: source
3835 * addr2: object
3836 * bits: Number of bits to compare
3837 * OUT:
3838 * 1 : equal
3839 * 0 : not equal
3840 */
3841 static int
3842 key_bbcmp(const void *a1, const void *a2, u_int bits)
3843 {
3844 const unsigned char *p1 = a1;
3845 const unsigned char *p2 = a2;
3846
3847 /* XXX: This could be considerably faster if we compare a word
3848 * at a time, but it is complicated on LSB Endian machines */
3849
3850 /* Handle null pointers */
3851 if (p1 == NULL || p2 == NULL)
3852 return (p1 == p2);
3853
3854 while (bits >= 8) {
3855 if (*p1++ != *p2++)
3856 return 0;
3857 bits -= 8;
3858 }
3859
3860 if (bits > 0) {
3861 u_int8_t mask = ~((1<<(8-bits))-1);
3862 if ((*p1 & mask) != (*p2 & mask))
3863 return 0;
3864 }
3865 return 1; /* Match! */
3866 }
3867
3868 /*
3869 * time handler.
3870 * scanning SPD and SAD to check status for each entries,
3871 * and do to remove or to expire.
3872 * XXX: year 2038 problem may remain.
3873 */
3874 void
3875 key_timehandler(void *unused)
3876 {
3877 u_int dir;
3878 time_t now = time_second;
3879 struct secspacq *spacq, *nextspacq;
3880
3881 crit_enter();
3882
3883 /* SPD */
3884 {
3885 struct secpolicy *sp, *nextsp;
3886
3887 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
3888 LIST_FOREACH_MUTABLE(sp, &sptree[dir], chain, nextsp) {
3889 if (sp->state == IPSEC_SPSTATE_DEAD) {
3890 KEY_FREESP(&sp);
3891 continue;
3892 }
3893
3894 if (sp->lifetime == 0 && sp->validtime == 0)
3895 continue;
3896
3897 /* the deletion will occur next time */
3898 if ((sp->lifetime && now - sp->created > sp->lifetime)
3899 || (sp->validtime && now - sp->lastused > sp->validtime)) {
3900 sp->state = IPSEC_SPSTATE_DEAD;
3901 key_spdexpire(sp);
3902 continue;
3903 }
3904 }
3905 }
3906 }
3907
3908 /* SAD */
3909 {
3910 struct secashead *sah, *nextsah;
3911 struct secasvar *sav, *nextsav;
3912
3913 LIST_FOREACH_MUTABLE(sah, &sahtree, chain, nextsah) {
3914 /* if sah has been dead, then delete it and process next sah. */
3915 if (sah->state == SADB_SASTATE_DEAD) {
3916 key_delsah(sah);
3917 continue;
3918 }
3919
3920 /* if LARVAL entry doesn't become MATURE, delete it. */
3921 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_LARVAL],
3922 chain, nextsav) {
3923 if (now - sav->created > key_larval_lifetime) {
3924 KEY_FREESAV(&sav);
3925 }
3926 }
3927
3928 /*
3929 * check MATURE entry to start to send expire message
3930 * whether or not.
3931 */
3932 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_MATURE],
3933 chain, nextsav) {
3934 /* we don't need to check. */
3935 if (sav->lft_s == NULL)
3936 continue;
3937
3938 /* sanity check */
3939 if (sav->lft_c == NULL) {
3940 ipseclog((LOG_DEBUG,"key_timehandler: "
3941 "There is no CURRENT time, why?\n"));
3942 continue;
3943 }
3944
3945 /* check SOFT lifetime */
3946 if (sav->lft_s->sadb_lifetime_addtime != 0
3947 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) {
3948 /*
3949 * check SA to be used whether or not.
3950 * when SA hasn't been used, delete it.
3951 */
3952 if (sav->lft_c->sadb_lifetime_usetime == 0) {
3953 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
3954 KEY_FREESAV(&sav);
3955 } else {
3956 key_sa_chgstate(sav, SADB_SASTATE_DYING);
3957 /*
3958 * XXX If we keep to send expire
3959 * message in the status of
3960 * DYING. Do remove below code.
3961 */
3962 key_expire(sav);
3963 }
3964 }
3965 /* check SOFT lifetime by bytes */
3966 /*
3967 * XXX I don't know the way to delete this SA
3968 * when new SA is installed. Caution when it's
3969 * installed too big lifetime by time.
3970 */
3971 else if (sav->lft_s->sadb_lifetime_bytes != 0
3972 && sav->lft_s->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
3973
3974 key_sa_chgstate(sav, SADB_SASTATE_DYING);
3975 /*
3976 * XXX If we keep to send expire
3977 * message in the status of
3978 * DYING. Do remove below code.
3979 */
3980 key_expire(sav);
3981 }
3982 }
3983
3984 /* check DYING entry to change status to DEAD. */
3985 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_DYING],
3986 chain, nextsav) {
3987 /* we don't need to check. */
3988 if (sav->lft_h == NULL)
3989 continue;
3990
3991 /* sanity check */
3992 if (sav->lft_c == NULL) {
3993 ipseclog((LOG_DEBUG, "key_timehandler: "
3994 "There is no CURRENT time, why?\n"));
3995 continue;
3996 }
3997
3998 if (sav->lft_h->sadb_lifetime_addtime != 0
3999 && now - sav->created > sav->lft_h->sadb_lifetime_addtime) {
4000 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4001 KEY_FREESAV(&sav);
4002 }
4003 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */
4004 else if (sav->lft_s != NULL
4005 && sav->lft_s->sadb_lifetime_addtime != 0
4006 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) {
4007 /*
4008 * XXX: should be checked to be
4009 * installed the valid SA.
4010 */
4011
4012 /*
4013 * If there is no SA then sending
4014 * expire message.
4015 */
4016 key_expire(sav);
4017 }
4018 #endif
4019 /* check HARD lifetime by bytes */
4020 else if (sav->lft_h->sadb_lifetime_bytes != 0
4021 && sav->lft_h->sadb_lifetime_bytes < sav->lft_c->sadb_lifetime_bytes) {
4022 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4023 KEY_FREESAV(&sav);
4024 }
4025 }
4026
4027 /* delete entry in DEAD */
4028 LIST_FOREACH_MUTABLE(sav, &sah->savtree[SADB_SASTATE_DEAD],
4029 chain, nextsav) {
4030 /* sanity check */
4031 if (sav->state != SADB_SASTATE_DEAD) {
4032 ipseclog((LOG_DEBUG, "key_timehandler: "
4033 "invalid sav->state "
4034 "(queue: %d SA: %d): "
4035 "kill it anyway\n",
4036 SADB_SASTATE_DEAD, sav->state));
4037 }
4038
4039 /*
4040 * do not call key_freesav() here.
4041 * sav should already be freed, and sav->refcnt
4042 * shows other references to sav
4043 * (such as from SPD).
4044 */
4045 }
4046 }
4047 }
4048
4049 #ifndef IPSEC_NONBLOCK_ACQUIRE
4050 /* ACQ tree */
4051 {
4052 struct secacq *acq, *nextacq;
4053
4054 LIST_FOREACH_MUTABLE(acq, &acqtree, chain, nextacq) {
4055 if (now - acq->created > key_blockacq_lifetime &&
4056 __LIST_CHAINED(acq)) {
4057 LIST_REMOVE(acq, chain);
4058 KFREE(acq);
4059 }
4060 }
4061 }
4062 #endif
4063
4064 /* SP ACQ tree */
4065 LIST_FOREACH_MUTABLE(spacq, &spacqtree, chain, nextspacq) {
4066 if (now - spacq->created > key_blockacq_lifetime &&
4067 __LIST_CHAINED(spacq)) {
4068 LIST_REMOVE(spacq, chain);
4069 KFREE(spacq);
4070 }
4071 }
4072
4073 /* initialize random seed */
4074 if (key_tick_init_random++ > key_int_random) {
4075 key_tick_init_random = 0;
4076 key_srandom();
4077 }
4078
4079 #ifndef IPSEC_DEBUG2
4080 /* do exchange to tick time !! */
4081 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL);
4082 #endif
4083
4084 crit_exit();
4085 return;
4086 }
4087
4088 /*
4089 * to initialize a seed for random()
4090 */
4091 static void
4092 key_srandom(void)
4093 {
4094 skrandom(time_second);
4095 }
4096
4097 u_long
4098 key_random(void)
4099 {
4100 u_long value;
4101
4102 key_randomfill(&value, sizeof(value));
4103 return value;
4104 }
4105
4106 void
4107 key_randomfill(void *p, size_t l)
4108 {
4109 size_t n;
4110 u_long v;
4111 static int warn = 1;
4112
4113 n = (size_t)read_random(p, (u_int)l);
4114 /* last resort */
4115 while (n < l) {
4116 v = krandom();
4117 bcopy(&v, (u_int8_t *)p + n,
4118 l - n < sizeof(v) ? l - n : sizeof(v));
4119 n += sizeof(v);
4120
4121 if (warn) {
4122 kprintf("WARNING: pseudo-random number generator "
4123 "used for IPsec processing\n");
4124 warn = 0;
4125 }
4126 }
4127 }
4128
4129 /*
4130 * map SADB_SATYPE_* to IPPROTO_*.
4131 * if satype == SADB_SATYPE then satype is mapped to ~0.
4132 * OUT:
4133 * 0: invalid satype.
4134 */
4135 static u_int16_t
4136 key_satype2proto(u_int8_t satype)
4137 {
4138 switch (satype) {
4139 case SADB_SATYPE_UNSPEC:
4140 return IPSEC_PROTO_ANY;
4141 case SADB_SATYPE_AH:
4142 return IPPROTO_AH;
4143 case SADB_SATYPE_ESP:
4144 return IPPROTO_ESP;
4145 case SADB_X_SATYPE_IPCOMP:
4146 return IPPROTO_IPCOMP;
4147 default:
4148 return 0;
4149 }
4150 /* NOTREACHED */
4151 }
4152
4153 /*
4154 * map IPPROTO_* to SADB_SATYPE_*
4155 * OUT:
4156 * 0: invalid protocol type.
4157 */
4158 static u_int8_t
4159 key_proto2satype(u_int16_t proto)
4160 {
4161 switch (proto) {
4162 case IPPROTO_AH:
4163 return SADB_SATYPE_AH;
4164 case IPPROTO_ESP:
4165 return SADB_SATYPE_ESP;
4166 case IPPROTO_IPCOMP:
4167 return SADB_X_SATYPE_IPCOMP;
4168 default:
4169 return 0;
4170 }
4171 /* NOTREACHED */
4172 }
4173
4174 /* %%% PF_KEY */
4175 /*
4176 * SADB_GETSPI processing is to receive
4177 * <base, (SA2), src address, dst address, (SPI range)>
4178 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND
4179 * tree with the status of LARVAL, and send
4180 * <base, SA(*), address(SD)>
4181 * to the IKMPd.
4182 *
4183 * IN: mhp: pointer to the pointer to each header.
4184 * OUT: NULL if fail.
4185 * other if success, return pointer to the message to send.
4186 */
4187 static int
4188 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4189 {
4190 struct sadb_address *src0, *dst0;
4191 struct secasindex saidx;
4192 struct secashead *newsah;
4193 struct secasvar *newsav;
4194 struct sockaddr *saddr, *daddr;
4195 u_int8_t proto;
4196 u_int32_t spi;
4197 u_int8_t mode;
4198 u_int32_t reqid;
4199 int error;
4200
4201 /* sanity check */
4202 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4203 panic("key_getspi: NULL pointer is passed.\n");
4204
4205 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4206 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
4207 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
4208 return key_senderror(so, m, EINVAL);
4209 }
4210 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4211 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4212 ipseclog((LOG_DEBUG, "key_getspi: invalid message is passed.\n"));
4213 return key_senderror(so, m, EINVAL);
4214 }
4215 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4216 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4217 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4218 } else {
4219 mode = IPSEC_MODE_ANY;
4220 reqid = 0;
4221 }
4222
4223 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4224 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4225
4226 /* map satype to proto */
4227 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4228 ipseclog((LOG_DEBUG, "key_getspi: invalid satype is passed.\n"));
4229 return key_senderror(so, m, EINVAL);
4230 }
4231
4232 /* make sure if port number is zero. */
4233 saddr = (struct sockaddr *)(src0 + 1);
4234 daddr = (struct sockaddr *)(dst0 + 1);
4235 switch (saddr->sa_family) {
4236 case AF_INET:
4237 if (saddr->sa_len != sizeof(struct sockaddr_in))
4238 return key_senderror(so, m, EINVAL);
4239 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0;
4240 break;
4241 case AF_INET6:
4242 if (saddr->sa_len != sizeof(struct sockaddr_in6))
4243 return key_senderror(so, m, EINVAL);
4244 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0;
4245 break;
4246 default:
4247 ; /*???*/
4248 }
4249 switch (daddr->sa_family) {
4250 case AF_INET:
4251 if (daddr->sa_len != sizeof(struct sockaddr_in))
4252 return key_senderror(so, m, EINVAL);
4253 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0;
4254 break;
4255 case AF_INET6:
4256 if (daddr->sa_len != sizeof(struct sockaddr_in6))
4257 return key_senderror(so, m, EINVAL);
4258 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0;
4259 break;
4260 default:
4261 ; /*???*/
4262 }
4263
4264 /* XXX boundary check against sa_len */
4265 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4266
4267 /* SPI allocation */
4268 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE],
4269 &saidx);
4270 if (spi == 0)
4271 return key_senderror(so, m, EINVAL);
4272
4273 /* get a SA index */
4274 if ((newsah = key_getsah(&saidx)) == NULL) {
4275 /* create a new SA index */
4276 if ((newsah = key_newsah(&saidx)) == NULL) {
4277 ipseclog((LOG_DEBUG, "key_getspi: No more memory.\n"));
4278 return key_senderror(so, m, ENOBUFS);
4279 }
4280 }
4281
4282 /* get a new SA */
4283 /* XXX rewrite */
4284 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4285 if (newsav == NULL) {
4286 /* XXX don't free new SA index allocated in above. */
4287 return key_senderror(so, m, error);
4288 }
4289
4290 /* set spi */
4291 newsav->spi = htonl(spi);
4292
4293 #ifndef IPSEC_NONBLOCK_ACQUIRE
4294 /* delete the entry in acqtree */
4295 if (mhp->msg->sadb_msg_seq != 0) {
4296 struct secacq *acq;
4297 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) {
4298 /* reset counter in order to deletion by timehandler. */
4299 acq->created = time_second;
4300 acq->count = 0;
4301 }
4302 }
4303 #endif
4304
4305 {
4306 struct mbuf *n;
4307 struct sadb_sa *m_sa;
4308 struct sadb_msg *newmsg;
4309 int off, len;
4310
4311 /* create new sadb_msg to reply. */
4312 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) +
4313 PFKEY_ALIGN8(sizeof(struct sadb_sa));
4314 if (len > MCLBYTES)
4315 return key_senderror(so, m, ENOBUFS);
4316 n = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
4317 if (!n)
4318 return key_senderror(so, m, ENOBUFS);
4319 n->m_len = len;
4320
4321 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
4322 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
4323
4324 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off);
4325 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa));
4326 m_sa->sadb_sa_exttype = SADB_EXT_SA;
4327 m_sa->sadb_sa_spi = htonl(spi);
4328 off += PFKEY_ALIGN8(sizeof(struct sadb_sa));
4329
4330 #ifdef DIAGNOSTIC
4331 if (off != len)
4332 panic("length inconsistency in key_getspi");
4333 #endif
4334
4335 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC,
4336 SADB_EXT_ADDRESS_DST);
4337 if (!n->m_next) {
4338 m_freem(n);
4339 return key_senderror(so, m, ENOBUFS);
4340 }
4341
4342 if (n->m_len < sizeof(struct sadb_msg)) {
4343 n = m_pullup(n, sizeof(struct sadb_msg));
4344 if (n == NULL)
4345 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
4346 }
4347 n->m_pkthdr.len = m_lengthm(n, NULL);
4348
4349 newmsg = mtod(n, struct sadb_msg *);
4350 newmsg->sadb_msg_seq = newsav->seq;
4351 newmsg->sadb_msg_errno = 0;
4352 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4353
4354 m_freem(m);
4355 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
4356 }
4357 }
4358
4359 /*
4360 * allocating new SPI
4361 * called by key_getspi().
4362 * OUT:
4363 * 0: failure.
4364 * others: success.
4365 */
4366 static u_int32_t
4367 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx)
4368 {
4369 u_int32_t newspi;
4370 u_int32_t min, max;
4371 int count = key_spi_trycnt;
4372
4373 /* set spi range to allocate */
4374 if (spirange != NULL) {
4375 min = spirange->sadb_spirange_min;
4376 max = spirange->sadb_spirange_max;
4377 } else {
4378 min = key_spi_minval;
4379 max = key_spi_maxval;
4380 }
4381 /* IPCOMP needs 2-byte SPI */
4382 if (saidx->proto == IPPROTO_IPCOMP) {
4383 u_int32_t t;
4384 if (min >= 0x10000)
4385 min = 0xffff;
4386 if (max >= 0x10000)
4387 max = 0xffff;
4388 if (min > max) {
4389 t = min; min = max; max = t;
4390 }
4391 }
4392
4393 if (min == max) {
4394 if (key_checkspidup(saidx, min) != NULL) {
4395 ipseclog((LOG_DEBUG, "key_do_getnewspi: SPI %u exists already.\n", min));
4396 return 0;
4397 }
4398
4399 count--; /* taking one cost. */
4400 newspi = min;
4401
4402 } else {
4403
4404 /* init SPI */
4405 newspi = 0;
4406
4407 /* when requesting to allocate spi ranged */
4408 while (count--) {
4409 /* generate pseudo-random SPI value ranged. */
4410 newspi = min + (key_random() % (max - min + 1));
4411
4412 if (key_checkspidup(saidx, newspi) == NULL)
4413 break;
4414 }
4415
4416 if (count == 0 || newspi == 0) {
4417 ipseclog((LOG_DEBUG, "key_do_getnewspi: to allocate spi is failed.\n"));
4418 return 0;
4419 }
4420 }
4421
4422 /* statistics */
4423 keystat.getspi_count =
4424 (keystat.getspi_count + key_spi_trycnt - count) / 2;
4425
4426 return newspi;
4427 }
4428
4429 /*
4430 * SADB_UPDATE processing
4431 * receive
4432 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4433 * key(AE), (identity(SD),) (sensitivity)>
4434 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL.
4435 * and send
4436 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4437 * (identity(SD),) (sensitivity)>
4438 * to the ikmpd.
4439 *
4440 * m will always be freed.
4441 */
4442 static int
4443 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4444 {
4445 struct sadb_sa *sa0;
4446 struct sadb_address *src0, *dst0;
4447 struct secasindex saidx;
4448 struct secashead *sah;
4449 struct secasvar *sav;
4450 u_int16_t proto;
4451 u_int8_t mode;
4452 u_int32_t reqid;
4453 int error;
4454
4455 /* sanity check */
4456 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4457 panic("key_update: NULL pointer is passed.\n");
4458
4459 /* map satype to proto */
4460 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4461 ipseclog((LOG_DEBUG, "key_update: invalid satype is passed.\n"));
4462 return key_senderror(so, m, EINVAL);
4463 }
4464
4465 if (mhp->ext[SADB_EXT_SA] == NULL ||
4466 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4467 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4468 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4469 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4470 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4471 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4472 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4473 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4474 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4475 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4476 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
4477 return key_senderror(so, m, EINVAL);
4478 }
4479 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4480 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4481 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4482 ipseclog((LOG_DEBUG, "key_update: invalid message is passed.\n"));
4483 return key_senderror(so, m, EINVAL);
4484 }
4485 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4486 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4487 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4488 } else {
4489 mode = IPSEC_MODE_ANY;
4490 reqid = 0;
4491 }
4492 /* XXX boundary checking for other extensions */
4493
4494 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4495 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4496 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4497
4498 /* XXX boundary check against sa_len */
4499 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4500
4501 /* get a SA header */
4502 if ((sah = key_getsah(&saidx)) == NULL) {
4503 ipseclog((LOG_DEBUG, "key_update: no SA index found.\n"));
4504 return key_senderror(so, m, ENOENT);
4505 }
4506
4507 /* set spidx if there */
4508 /* XXX rewrite */
4509 error = key_setident(sah, m, mhp);
4510 if (error)
4511 return key_senderror(so, m, error);
4512
4513 /* find a SA with sequence number. */
4514 #ifdef IPSEC_DOSEQCHECK
4515 if (mhp->msg->sadb_msg_seq != 0
4516 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) {
4517 ipseclog((LOG_DEBUG,
4518 "key_update: no larval SA with sequence %u exists.\n",
4519 mhp->msg->sadb_msg_seq));
4520 return key_senderror(so, m, ENOENT);
4521 }
4522 #else
4523 if ((sav = key_getsavbyspi(sah, sa0->sadb_sa_spi)) == NULL) {
4524 ipseclog((LOG_DEBUG,
4525 "key_update: no such a SA found (spi:%u)\n",
4526 (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4527 return key_senderror(so, m, EINVAL);
4528 }
4529 #endif
4530
4531 /* validity check */
4532 if (sav->sah->saidx.proto != proto) {
4533 ipseclog((LOG_DEBUG,
4534 "key_update: protocol mismatched (DB=%u param=%u)\n",
4535 sav->sah->saidx.proto, proto));
4536 return key_senderror(so, m, EINVAL);
4537 }
4538 #ifdef IPSEC_DOSEQCHECK
4539 if (sav->spi != sa0->sadb_sa_spi) {
4540 ipseclog((LOG_DEBUG,
4541 "key_update: SPI mismatched (DB:%u param:%u)\n",
4542 (u_int32_t)ntohl(sav->spi),
4543 (u_int32_t)ntohl(sa0->sadb_sa_spi)));
4544 return key_senderror(so, m, EINVAL);
4545 }
4546 #endif
4547 if (sav->pid != mhp->msg->sadb_msg_pid) {
4548 ipseclog((LOG_DEBUG,
4549 "key_update: pid mismatched (DB:%u param:%u)\n",
4550 sav->pid, mhp->msg->sadb_msg_pid));
4551 return key_senderror(so, m, EINVAL);
4552 }
4553
4554 /* copy sav values */
4555 error = key_setsaval(sav, m, mhp);
4556 if (error) {
4557 KEY_FREESAV(&sav);
4558 return key_senderror(so, m, error);
4559 }
4560
4561 /* check SA values to be mature. */
4562 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) {
4563 KEY_FREESAV(&sav);
4564 return key_senderror(so, m, 0);
4565 }
4566
4567 {
4568 struct mbuf *n;
4569
4570 /* set msg buf from mhp */
4571 n = key_getmsgbuf_x1(m, mhp);
4572 if (n == NULL) {
4573 ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
4574 return key_senderror(so, m, ENOBUFS);
4575 }
4576
4577 m_freem(m);
4578 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4579 }
4580 }
4581
4582 /*
4583 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL.
4584 * only called by key_update().
4585 * OUT:
4586 * NULL : not found
4587 * others : found, pointer to a SA.
4588 */
4589 #ifdef IPSEC_DOSEQCHECK
4590 static struct secasvar *
4591 key_getsavbyseq(struct secashead *sah, u_int32_t seq)
4592 {
4593 struct secasvar *sav;
4594 u_int state;
4595
4596 state = SADB_SASTATE_LARVAL;
4597
4598 /* search SAD with sequence number ? */
4599 LIST_FOREACH(sav, &sah->savtree[state], chain) {
4600
4601 KEY_CHKSASTATE(state, sav->state, "key_getsabyseq");
4602
4603 if (sav->seq == seq) {
4604 SA_ADDREF(sav);
4605 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
4606 kprintf("DP key_getsavbyseq cause "
4607 "refcnt++:%d SA:%p\n",
4608 sav->refcnt, sav));
4609 return sav;
4610 }
4611 }
4612
4613 return NULL;
4614 }
4615 #endif
4616
4617 /*
4618 * SADB_ADD processing
4619 * add an entry to SA database, when received
4620 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4621 * key(AE), (identity(SD),) (sensitivity)>
4622 * from the ikmpd,
4623 * and send
4624 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),)
4625 * (identity(SD),) (sensitivity)>
4626 * to the ikmpd.
4627 *
4628 * IGNORE identity and sensitivity messages.
4629 *
4630 * m will always be freed.
4631 */
4632 static int
4633 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4634 {
4635 struct sadb_sa *sa0;
4636 struct sadb_address *src0, *dst0;
4637 struct secasindex saidx;
4638 struct secashead *newsah;
4639 struct secasvar *newsav;
4640 u_int16_t proto;
4641 u_int8_t mode;
4642 u_int32_t reqid;
4643 int error;
4644
4645 /* sanity check */
4646 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4647 panic("key_add: NULL pointer is passed.\n");
4648
4649 /* map satype to proto */
4650 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4651 ipseclog((LOG_DEBUG, "key_add: invalid satype is passed.\n"));
4652 return key_senderror(so, m, EINVAL);
4653 }
4654
4655 if (mhp->ext[SADB_EXT_SA] == NULL ||
4656 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4657 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
4658 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP &&
4659 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) ||
4660 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH &&
4661 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) ||
4662 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL &&
4663 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) ||
4664 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL &&
4665 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) {
4666 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
4667 return key_senderror(so, m, EINVAL);
4668 }
4669 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
4670 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4671 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4672 /* XXX need more */
4673 ipseclog((LOG_DEBUG, "key_add: invalid message is passed.\n"));
4674 return key_senderror(so, m, EINVAL);
4675 }
4676 if (mhp->ext[SADB_X_EXT_SA2] != NULL) {
4677 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode;
4678 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid;
4679 } else {
4680 mode = IPSEC_MODE_ANY;
4681 reqid = 0;
4682 }
4683
4684 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4685 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
4686 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
4687
4688 /* XXX boundary check against sa_len */
4689 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx);
4690
4691 /* get a SA header */
4692 if ((newsah = key_getsah(&saidx)) == NULL) {
4693 /* create a new SA header */
4694 if ((newsah = key_newsah(&saidx)) == NULL) {
4695 ipseclog((LOG_DEBUG, "key_add: No more memory.\n"));
4696 return key_senderror(so, m, ENOBUFS);
4697 }
4698 }
4699
4700 /* set spidx if there */
4701 /* XXX rewrite */
4702 error = key_setident(newsah, m, mhp);
4703 if (error) {
4704 return key_senderror(so, m, error);
4705 }
4706
4707 /* create new SA entry. */
4708 /* We can create new SA only if SPI is differenct. */
4709 if (key_getsavbyspi(newsah, sa0->sadb_sa_spi)) {
4710 ipseclog((LOG_DEBUG, "key_add: SA already exists.\n"));
4711 return key_senderror(so, m, EEXIST);
4712 }
4713 newsav = KEY_NEWSAV(m, mhp, newsah, &error);
4714 if (newsav == NULL) {
4715 return key_senderror(so, m, error);
4716 }
4717
4718 /* check SA values to be mature. */
4719 if ((error = key_mature(newsav)) != 0) {
4720 KEY_FREESAV(&newsav);
4721 return key_senderror(so, m, error);
4722 }
4723
4724 /*
4725 * don't call key_freesav() here, as we would like to keep the SA
4726 * in the database on success.
4727 */
4728
4729 {
4730 struct mbuf *n;
4731
4732 /* set msg buf from mhp */
4733 n = key_getmsgbuf_x1(m, mhp);
4734 if (n == NULL) {
4735 ipseclog((LOG_DEBUG, "key_update: No more memory.\n"));
4736 return key_senderror(so, m, ENOBUFS);
4737 }
4738
4739 m_freem(m);
4740 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4741 }
4742 }
4743
4744 /* m is retained */
4745 static int
4746 key_setident(struct secashead *sah, struct mbuf *m,
4747 const struct sadb_msghdr *mhp)
4748 {
4749 const struct sadb_ident *idsrc, *iddst;
4750 int idsrclen, iddstlen;
4751
4752 /* sanity check */
4753 if (sah == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4754 panic("key_setident: NULL pointer is passed.\n");
4755
4756 /* don't make buffer if not there */
4757 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL &&
4758 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
4759 sah->idents = NULL;
4760 sah->identd = NULL;
4761 return 0;
4762 }
4763
4764 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL ||
4765 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) {
4766 ipseclog((LOG_DEBUG, "key_setident: invalid identity.\n"));
4767 return EINVAL;
4768 }
4769
4770 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC];
4771 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST];
4772 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC];
4773 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST];
4774
4775 /* validity check */
4776 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) {
4777 ipseclog((LOG_DEBUG, "key_setident: ident type mismatch.\n"));
4778 return EINVAL;
4779 }
4780
4781 switch (idsrc->sadb_ident_type) {
4782 case SADB_IDENTTYPE_PREFIX:
4783 case SADB_IDENTTYPE_FQDN:
4784 case SADB_IDENTTYPE_USERFQDN:
4785 default:
4786 /* XXX do nothing */
4787 sah->idents = NULL;
4788 sah->identd = NULL;
4789 return 0;
4790 }
4791
4792 /* make structure */
4793 KMALLOC(sah->idents, struct sadb_ident *, idsrclen);
4794 if (sah->idents == NULL) {
4795 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
4796 return ENOBUFS;
4797 }
4798 KMALLOC(sah->identd, struct sadb_ident *, iddstlen);
4799 if (sah->identd == NULL) {
4800 KFREE(sah->idents);
4801 sah->idents = NULL;
4802 ipseclog((LOG_DEBUG, "key_setident: No more memory.\n"));
4803 return ENOBUFS;
4804 }
4805 bcopy(idsrc, sah->idents, idsrclen);
4806 bcopy(iddst, sah->identd, iddstlen);
4807
4808 return 0;
4809 }
4810
4811 /*
4812 * m will not be freed on return.
4813 * it is caller's responsibility to free the result.
4814 */
4815 static struct mbuf *
4816 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp)
4817 {
4818 struct mbuf *n;
4819
4820 /* sanity check */
4821 if (m == NULL || mhp == NULL || mhp->msg == NULL)
4822 panic("key_getmsgbuf_x1: NULL pointer is passed.\n");
4823
4824 /* create new sadb_msg to reply. */
4825 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED,
4826 SADB_EXT_SA, SADB_X_EXT_SA2,
4827 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST,
4828 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
4829 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST);
4830 if (!n)
4831 return NULL;
4832
4833 if (n->m_len < sizeof(struct sadb_msg)) {
4834 n = m_pullup(n, sizeof(struct sadb_msg));
4835 if (n == NULL)
4836 return NULL;
4837 }
4838 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0;
4839 mtod(n, struct sadb_msg *)->sadb_msg_len =
4840 PFKEY_UNIT64(n->m_pkthdr.len);
4841
4842 return n;
4843 }
4844
4845 static int key_delete_all (struct socket *, struct mbuf *,
4846 const struct sadb_msghdr *, u_int16_t);
4847
4848 /*
4849 * SADB_DELETE processing
4850 * receive
4851 * <base, SA(*), address(SD)>
4852 * from the ikmpd, and set SADB_SASTATE_DEAD,
4853 * and send,
4854 * <base, SA(*), address(SD)>
4855 * to the ikmpd.
4856 *
4857 * m will always be freed.
4858 */
4859 static int
4860 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
4861 {
4862 struct sadb_sa *sa0;
4863 struct sadb_address *src0, *dst0;
4864 struct secasindex saidx;
4865 struct secashead *sah;
4866 struct secasvar *sav = NULL;
4867 u_int16_t proto;
4868
4869 /* sanity check */
4870 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
4871 panic("key_delete: NULL pointer is passed.\n");
4872
4873 /* map satype to proto */
4874 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
4875 ipseclog((LOG_DEBUG, "key_delete: invalid satype is passed.\n"));
4876 return key_senderror(so, m, EINVAL);
4877 }
4878
4879 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
4880 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
4881 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4882 return key_senderror(so, m, EINVAL);
4883 }
4884
4885 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
4886 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
4887 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4888 return key_senderror(so, m, EINVAL);
4889 }
4890
4891 if (mhp->ext[SADB_EXT_SA] == NULL) {
4892 /*
4893 * Caller wants us to delete all non-LARVAL SAs
4894 * that match the src/dst. This is used during
4895 * IKE INITIAL-CONTACT.
4896 */
4897 ipseclog((LOG_DEBUG, "key_delete: doing delete all.\n"));
4898 return key_delete_all(so, m, mhp, proto);
4899 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) {
4900 ipseclog((LOG_DEBUG, "key_delete: invalid message is passed.\n"));
4901 return key_senderror(so, m, EINVAL);
4902 }
4903
4904 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
4905 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4906 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4907
4908 /* XXX boundary check against sa_len */
4909 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
4910
4911 /* get a SA header */
4912 LIST_FOREACH(sah, &sahtree, chain) {
4913 if (sah->state == SADB_SASTATE_DEAD)
4914 continue;
4915 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
4916 continue;
4917
4918 /* get a SA with SPI. */
4919 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
4920 if (sav)
4921 break;
4922 }
4923 if (sah == NULL) {
4924 ipseclog((LOG_DEBUG, "key_delete: no SA found.\n"));
4925 return key_senderror(so, m, ENOENT);
4926 }
4927
4928 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
4929 KEY_FREESAV(&sav);
4930
4931 {
4932 struct mbuf *n;
4933 struct sadb_msg *newmsg;
4934
4935 /* create new sadb_msg to reply. */
4936 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
4937 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
4938 if (!n)
4939 return key_senderror(so, m, ENOBUFS);
4940
4941 if (n->m_len < sizeof(struct sadb_msg)) {
4942 n = m_pullup(n, sizeof(struct sadb_msg));
4943 if (n == NULL)
4944 return key_senderror(so, m, ENOBUFS);
4945 }
4946 newmsg = mtod(n, struct sadb_msg *);
4947 newmsg->sadb_msg_errno = 0;
4948 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
4949
4950 m_freem(m);
4951 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
4952 }
4953 }
4954
4955 /*
4956 * delete all SAs for src/dst. Called from key_delete().
4957 */
4958 static int
4959 key_delete_all(struct socket *so, struct mbuf *m,
4960 const struct sadb_msghdr *mhp, u_int16_t proto)
4961 {
4962 struct sadb_address *src0, *dst0;
4963 struct secasindex saidx;
4964 struct secashead *sah;
4965 struct secasvar *sav, *nextsav;
4966 u_int stateidx, state;
4967 struct mbuf *n;
4968 struct sadb_msg *newmsg;
4969
4970 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]);
4971 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]);
4972
4973 /* XXX boundary check against sa_len */
4974 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
4975
4976 LIST_FOREACH(sah, &sahtree, chain) {
4977 if (sah->state == SADB_SASTATE_DEAD)
4978 continue;
4979 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
4980 continue;
4981
4982 /* Delete all non-LARVAL SAs. */
4983 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive);
4984 stateidx++) {
4985 state = saorder_state_alive[stateidx];
4986 if (state == SADB_SASTATE_LARVAL)
4987 continue;
4988 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain,
4989 nextsav) {
4990 /* sanity check */
4991 if (sav->state != state) {
4992 ipseclog((LOG_DEBUG, "key_delete_all: "
4993 "invalid sav->state "
4994 "(queue: %d SA: %d)\n",
4995 state, sav->state));
4996 continue;
4997 }
4998
4999 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
5000 KEY_FREESAV(&sav);
5001 }
5002 }
5003 }
5004
5005 /* create new sadb_msg to reply. */
5006 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED,
5007 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
5008 if (!n)
5009 return key_senderror(so, m, ENOBUFS);
5010
5011 if (n->m_len < sizeof(struct sadb_msg)) {
5012 n = m_pullup(n, sizeof(struct sadb_msg));
5013 if (n == NULL)
5014 return key_senderror(so, m, ENOBUFS);
5015 }
5016 newmsg = mtod(n, struct sadb_msg *);
5017 newmsg->sadb_msg_errno = 0;
5018 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
5019
5020 m_freem(m);
5021 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
5022 }
5023
5024 /*
5025 * SADB_GET processing
5026 * receive
5027 * <base, SA(*), address(SD)>
5028 * from the ikmpd, and get a SP and a SA to respond,
5029 * and send,
5030 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE),
5031 * (identity(SD),) (sensitivity)>
5032 * to the ikmpd.
5033 *
5034 * m will always be freed.
5035 */
5036 static int
5037 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5038 {
5039 struct sadb_sa *sa0;
5040 struct sadb_address *src0, *dst0;
5041 struct secasindex saidx;
5042 struct secashead *sah;
5043 struct secasvar *sav = NULL;
5044 u_int16_t proto;
5045
5046 /* sanity check */
5047 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5048 panic("key_get: NULL pointer is passed.\n");
5049
5050 /* map satype to proto */
5051 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5052 ipseclog((LOG_DEBUG, "key_get: invalid satype is passed.\n"));
5053 return key_senderror(so, m, EINVAL);
5054 }
5055
5056 if (mhp->ext[SADB_EXT_SA] == NULL ||
5057 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5058 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) {
5059 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
5060 return key_senderror(so, m, EINVAL);
5061 }
5062 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) ||
5063 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5064 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) {
5065 ipseclog((LOG_DEBUG, "key_get: invalid message is passed.\n"));
5066 return key_senderror(so, m, EINVAL);
5067 }
5068
5069 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA];
5070 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5071 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5072
5073 /* XXX boundary check against sa_len */
5074 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5075
5076 /* get a SA header */
5077 LIST_FOREACH(sah, &sahtree, chain) {
5078 if (sah->state == SADB_SASTATE_DEAD)
5079 continue;
5080 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0)
5081 continue;
5082
5083 /* get a SA with SPI. */
5084 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi);
5085 if (sav)
5086 break;
5087 }
5088 if (sah == NULL) {
5089 ipseclog((LOG_DEBUG, "key_get: no SA found.\n"));
5090 return key_senderror(so, m, ENOENT);
5091 }
5092
5093 {
5094 struct mbuf *n;
5095 u_int8_t satype;
5096
5097 /* map proto to satype */
5098 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
5099 ipseclog((LOG_DEBUG, "key_get: there was invalid proto in SAD.\n"));
5100 return key_senderror(so, m, EINVAL);
5101 }
5102
5103 /* create new sadb_msg to reply. */
5104 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq,
5105 mhp->msg->sadb_msg_pid);
5106 if (!n)
5107 return key_senderror(so, m, ENOBUFS);
5108
5109 m_freem(m);
5110 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
5111 }
5112 }
5113
5114 /* XXX make it sysctl-configurable? */
5115 static void
5116 key_getcomb_setlifetime(struct sadb_comb *comb)
5117 {
5118
5119 comb->sadb_comb_soft_allocations = 1;
5120 comb->sadb_comb_hard_allocations = 1;
5121 comb->sadb_comb_soft_bytes = 0;
5122 comb->sadb_comb_hard_bytes = 0;
5123 comb->sadb_comb_hard_addtime = 86400; /* 1 day */
5124 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100;
5125 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */
5126 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100;
5127 }
5128
5129 /*
5130 * XXX reorder combinations by preference
5131 * XXX no idea if the user wants ESP authentication or not
5132 */
5133 static struct mbuf *
5134 key_getcomb_esp(void)
5135 {
5136 struct sadb_comb *comb;
5137 struct enc_xform *algo;
5138 struct mbuf *result = NULL, *m, *n;
5139 int encmin;
5140 int i, off, o;
5141 int totlen;
5142 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5143
5144 m = NULL;
5145 for (i = 1; i <= SADB_EALG_MAX; i++) {
5146 algo = esp_algorithm_lookup(i);
5147 if (algo == NULL)
5148 continue;
5149
5150 /* discard algorithms with key size smaller than system min */
5151 if (_BITS(algo->maxkey) < ipsec_esp_keymin)
5152 continue;
5153 if (_BITS(algo->minkey) < ipsec_esp_keymin)
5154 encmin = ipsec_esp_keymin;
5155 else
5156 encmin = _BITS(algo->minkey);
5157
5158 if (ipsec_esp_auth)
5159 m = key_getcomb_ah();
5160 else {
5161 KASSERT(l <= MLEN,
5162 ("key_getcomb_esp: l=%u > MLEN=%lu",
5163 l, (u_long) MLEN));
5164 MGET(m, MB_DONTWAIT, MT_DATA);
5165 if (m) {
5166 M_ALIGN(m, l);
5167 m->m_len = l;
5168 m->m_next = NULL;
5169 bzero(mtod(m, caddr_t), m->m_len);
5170 }
5171 }
5172 if (!m)
5173 goto fail;
5174
5175 totlen = m_lengthm(m, NULL);
5176 KASSERT((totlen % l) == 0,
5177 ("key_getcomb_esp: totlen=%u, l=%u", totlen, l));
5178
5179 for (off = 0; off < totlen; off += l) {
5180 n = m_pulldown(m, off, l, &o);
5181 if (!n) {
5182 /* m is already freed */
5183 goto fail;
5184 }
5185 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o);
5186 bzero(comb, sizeof(*comb));
5187 key_getcomb_setlifetime(comb);
5188 comb->sadb_comb_encrypt = i;
5189 comb->sadb_comb_encrypt_minbits = encmin;
5190 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey);
5191 }
5192
5193 if (!result)
5194 result = m;
5195 else
5196 m_cat(result, m);
5197 }
5198
5199 return result;
5200
5201 fail:
5202 if (result)
5203 m_freem(result);
5204 return NULL;
5205 }
5206
5207 static void
5208 key_getsizes_ah(
5209 const struct auth_hash *ah,
5210 int alg,
5211 u_int16_t* min,
5212 u_int16_t* max)
5213 {
5214 *min = *max = ah->keysize;
5215 if (ah->keysize == 0) {
5216 /*
5217 * Transform takes arbitrary key size but algorithm
5218 * key size is restricted. Enforce this here.
5219 */
5220 switch (alg) {
5221 case SADB_X_AALG_MD5: *min = *max = 16; break;
5222 case SADB_X_AALG_SHA: *min = *max = 20; break;
5223 case SADB_X_AALG_NULL: *min = 1; *max = 256; break;
5224 default:
5225 DPRINTF(("key_getsizes_ah: unknown AH algorithm %u\n",
5226 alg));
5227 break;
5228 }
5229 }
5230 }
5231
5232 /*
5233 * XXX reorder combinations by preference
5234 */
5235 static struct mbuf *
5236 key_getcomb_ah(void)
5237 {
5238 struct sadb_comb *comb;
5239 struct auth_hash *algo;
5240 struct mbuf *m;
5241 u_int16_t minkeysize, maxkeysize;
5242 int i;
5243 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5244
5245 m = NULL;
5246 for (i = 1; i <= SADB_AALG_MAX; i++) {
5247 #if 1
5248 /* we prefer HMAC algorithms, not old algorithms */
5249 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC)
5250 continue;
5251 #endif
5252 algo = ah_algorithm_lookup(i);
5253 if (!algo)
5254 continue;
5255 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize);
5256 /* discard algorithms with key size smaller than system min */
5257 if (_BITS(minkeysize) < ipsec_ah_keymin)
5258 continue;
5259
5260 if (!m) {
5261 KASSERT(l <= MLEN,
5262 ("key_getcomb_ah: l=%u > MLEN=%lu",
5263 l, (u_long) MLEN));
5264 MGET(m, MB_DONTWAIT, MT_DATA);
5265 if (m) {
5266 M_ALIGN(m, l);
5267 m->m_len = l;
5268 m->m_next = NULL;
5269 }
5270 } else
5271 M_PREPEND(m, l, MB_DONTWAIT);
5272 if (!m)
5273 return NULL;
5274
5275 comb = mtod(m, struct sadb_comb *);
5276 bzero(comb, sizeof(*comb));
5277 key_getcomb_setlifetime(comb);
5278 comb->sadb_comb_auth = i;
5279 comb->sadb_comb_auth_minbits = _BITS(minkeysize);
5280 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize);
5281 }
5282
5283 return m;
5284 }
5285
5286 /*
5287 * not really an official behavior. discussed in pf_key@inner.net in Sep2000.
5288 * XXX reorder combinations by preference
5289 */
5290 static struct mbuf *
5291 key_getcomb_ipcomp(void)
5292 {
5293 struct sadb_comb *comb;
5294 struct comp_algo *algo;
5295 struct mbuf *m;
5296 int i;
5297 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb));
5298
5299 m = NULL;
5300 for (i = 1; i <= SADB_X_CALG_MAX; i++) {
5301 algo = ipcomp_algorithm_lookup(i);
5302 if (!algo)
5303 continue;
5304
5305 if (!m) {
5306 KASSERT(l <= MLEN,
5307 ("key_getcomb_ipcomp: l=%u > MLEN=%lu",
5308 l, (u_long) MLEN));
5309 MGET(m, MB_DONTWAIT, MT_DATA);
5310 if (m) {
5311 M_ALIGN(m, l);
5312 m->m_len = l;
5313 m->m_next = NULL;
5314 }
5315 } else
5316 M_PREPEND(m, l, MB_DONTWAIT);
5317 if (!m)
5318 return NULL;
5319
5320 comb = mtod(m, struct sadb_comb *);
5321 bzero(comb, sizeof(*comb));
5322 key_getcomb_setlifetime(comb);
5323 comb->sadb_comb_encrypt = i;
5324 /* what should we set into sadb_comb_*_{min,max}bits? */
5325 }
5326
5327 return m;
5328 }
5329
5330 /*
5331 * XXX no way to pass mode (transport/tunnel) to userland
5332 * XXX replay checking?
5333 * XXX sysctl interface to ipsec_{ah,esp}_keymin
5334 */
5335 static struct mbuf *
5336 key_getprop(const struct secasindex *saidx)
5337 {
5338 struct sadb_prop *prop;
5339 struct mbuf *m;
5340 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop));
5341
5342 switch (saidx->proto) {
5343 case IPPROTO_ESP:
5344 m = key_getcomb_esp();
5345 break;
5346 case IPPROTO_AH:
5347 m = key_getcomb_ah();
5348 break;
5349 case IPPROTO_IPCOMP:
5350 m = key_getcomb_ipcomp();
5351 break;
5352 default:
5353 return NULL;
5354 }
5355
5356 if (!m)
5357 return NULL;
5358 M_PREPEND(m, l, MB_DONTWAIT);
5359 if (!m)
5360 return NULL;
5361
5362 prop = mtod(m, struct sadb_prop *);
5363 bzero(prop, sizeof(*prop));
5364 prop->sadb_prop_len = PFKEY_UNIT64(m_lengthm(m, NULL));
5365 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL;
5366 prop->sadb_prop_replay = 32; /* XXX */
5367
5368 return m;
5369 }
5370
5371 /*
5372 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2().
5373 * send
5374 * <base, SA, address(SD), (address(P)), x_policy,
5375 * (identity(SD),) (sensitivity,) proposal>
5376 * to KMD, and expect to receive
5377 * <base> with SADB_ACQUIRE if error occured,
5378 * or
5379 * <base, src address, dst address, (SPI range)> with SADB_GETSPI
5380 * from KMD by PF_KEY.
5381 *
5382 * XXX x_policy is outside of RFC2367 (KAME extension).
5383 * XXX sensitivity is not supported.
5384 * XXX for ipcomp, RFC2367 does not define how to fill in proposal.
5385 * see comment for key_getcomb_ipcomp().
5386 *
5387 * OUT:
5388 * 0 : succeed
5389 * others: error number
5390 */
5391 static int
5392 key_acquire(const struct secasindex *saidx, struct secpolicy *sp)
5393 {
5394 struct mbuf *result = NULL, *m;
5395 #ifndef IPSEC_NONBLOCK_ACQUIRE
5396 struct secacq *newacq;
5397 #endif
5398 u_int8_t satype;
5399 int error = -1;
5400 u_int32_t seq;
5401
5402 /* sanity check */
5403 KASSERT(saidx != NULL, ("key_acquire: null saidx"));
5404 satype = key_proto2satype(saidx->proto);
5405 KASSERT(satype != 0,
5406 ("key_acquire: null satype, protocol %u", saidx->proto));
5407
5408 #ifndef IPSEC_NONBLOCK_ACQUIRE
5409 /*
5410 * We never do anything about acquirng SA. There is anather
5411 * solution that kernel blocks to send SADB_ACQUIRE message until
5412 * getting something message from IKEd. In later case, to be
5413 * managed with ACQUIRING list.
5414 */
5415 /* Get an entry to check whether sending message or not. */
5416 if ((newacq = key_getacq(saidx)) != NULL) {
5417 if (key_blockacq_count < newacq->count) {
5418 /* reset counter and do send message. */
5419 newacq->count = 0;
5420 } else {
5421 /* increment counter and do nothing. */
5422 newacq->count++;
5423 return 0;
5424 }
5425 } else {
5426 /* make new entry for blocking to send SADB_ACQUIRE. */
5427 if ((newacq = key_newacq(saidx)) == NULL)
5428 return ENOBUFS;
5429
5430 /* add to acqtree */
5431 LIST_INSERT_HEAD(&acqtree, newacq, chain);
5432 }
5433 #endif
5434
5435
5436 #ifndef IPSEC_NONBLOCK_ACQUIRE
5437 seq = newacq->seq;
5438 #else
5439 seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
5440 #endif
5441 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0);
5442 if (!m) {
5443 error = ENOBUFS;
5444 goto fail;
5445 }
5446 result = m;
5447
5448 /* set sadb_address for saidx's. */
5449 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
5450 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5451 if (!m) {
5452 error = ENOBUFS;
5453 goto fail;
5454 }
5455 m_cat(result, m);
5456
5457 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
5458 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY);
5459 if (!m) {
5460 error = ENOBUFS;
5461 goto fail;
5462 }
5463 m_cat(result, m);
5464
5465 /* XXX proxy address (optional) */
5466
5467 /* set sadb_x_policy */
5468 if (sp) {
5469 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id);
5470 if (!m) {
5471 error = ENOBUFS;
5472 goto fail;
5473 }
5474 m_cat(result, m);
5475 }
5476
5477 /* XXX identity (optional) */
5478 #if 0
5479 if (idexttype && fqdn) {
5480 /* create identity extension (FQDN) */
5481 struct sadb_ident *id;
5482 int fqdnlen;
5483
5484 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */
5485 id = (struct sadb_ident *)p;
5486 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5487 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen));
5488 id->sadb_ident_exttype = idexttype;
5489 id->sadb_ident_type = SADB_IDENTTYPE_FQDN;
5490 bcopy(fqdn, id + 1, fqdnlen);
5491 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen);
5492 }
5493
5494 if (idexttype) {
5495 /* create identity extension (USERFQDN) */
5496 struct sadb_ident *id;
5497 int userfqdnlen;
5498
5499 if (userfqdn) {
5500 /* +1 for terminating-NUL */
5501 userfqdnlen = strlen(userfqdn) + 1;
5502 } else
5503 userfqdnlen = 0;
5504 id = (struct sadb_ident *)p;
5505 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5506 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen));
5507 id->sadb_ident_exttype = idexttype;
5508 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN;
5509 /* XXX is it correct? */
5510 if (curproc && curproc->p_cred)
5511 id->sadb_ident_id = curproc->p_cred->p_ruid;
5512 if (userfqdn && userfqdnlen)
5513 bcopy(userfqdn, id + 1, userfqdnlen);
5514 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen);
5515 }
5516 #endif
5517
5518 /* XXX sensitivity (optional) */
5519
5520 /* create proposal/combination extension */
5521 m = key_getprop(saidx);
5522 #if 0
5523 /*
5524 * spec conformant: always attach proposal/combination extension,
5525 * the problem is that we have no way to attach it for ipcomp,
5526 * due to the way sadb_comb is declared in RFC2367.
5527 */
5528 if (!m) {
5529 error = ENOBUFS;
5530 goto fail;
5531 }
5532 m_cat(result, m);
5533 #else
5534 /*
5535 * outside of spec; make proposal/combination extension optional.
5536 */
5537 if (m)
5538 m_cat(result, m);
5539 #endif
5540
5541 if ((result->m_flags & M_PKTHDR) == 0) {
5542 error = EINVAL;
5543 goto fail;
5544 }
5545
5546 if (result->m_len < sizeof(struct sadb_msg)) {
5547 result = m_pullup(result, sizeof(struct sadb_msg));
5548 if (result == NULL) {
5549 error = ENOBUFS;
5550 goto fail;
5551 }
5552 }
5553 result->m_pkthdr.len = m_lengthm(result, NULL);
5554 mtod(result, struct sadb_msg *)->sadb_msg_len =
5555 PFKEY_UNIT64(result->m_pkthdr.len);
5556
5557 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
5558
5559 fail:
5560 if (result)
5561 m_freem(result);
5562 return error;
5563 }
5564
5565 #ifndef IPSEC_NONBLOCK_ACQUIRE
5566 static struct secacq *
5567 key_newacq(const struct secasindex *saidx)
5568 {
5569 struct secacq *newacq;
5570
5571 /* get new entry */
5572 KMALLOC(newacq, struct secacq *, sizeof(struct secacq));
5573 if (newacq == NULL) {
5574 ipseclog((LOG_DEBUG, "key_newacq: No more memory.\n"));
5575 return NULL;
5576 }
5577 bzero(newacq, sizeof(*newacq));
5578
5579 /* copy secindex */
5580 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx));
5581 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq);
5582 newacq->created = time_second;
5583 newacq->count = 0;
5584
5585 return newacq;
5586 }
5587
5588 static struct secacq *
5589 key_getacq(const struct secasindex *saidx)
5590 {
5591 struct secacq *acq;
5592
5593 LIST_FOREACH(acq, &acqtree, chain) {
5594 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY))
5595 return acq;
5596 }
5597
5598 return NULL;
5599 }
5600
5601 static struct secacq *
5602 key_getacqbyseq(u_int32_t seq)
5603 {
5604 struct secacq *acq;
5605
5606 LIST_FOREACH(acq, &acqtree, chain) {
5607 if (acq->seq == seq)
5608 return acq;
5609 }
5610
5611 return NULL;
5612 }
5613 #endif
5614
5615 static struct secspacq *
5616 key_newspacq(struct secpolicyindex *spidx)
5617 {
5618 struct secspacq *acq;
5619
5620 /* get new entry */
5621 KMALLOC(acq, struct secspacq *, sizeof(struct secspacq));
5622 if (acq == NULL) {
5623 ipseclog((LOG_DEBUG, "key_newspacq: No more memory.\n"));
5624 return NULL;
5625 }
5626 bzero(acq, sizeof(*acq));
5627
5628 /* copy secindex */
5629 bcopy(spidx, &acq->spidx, sizeof(acq->spidx));
5630 acq->created = time_second;
5631 acq->count = 0;
5632
5633 return acq;
5634 }
5635
5636 static struct secspacq *
5637 key_getspacq(struct secpolicyindex *spidx)
5638 {
5639 struct secspacq *acq;
5640
5641 LIST_FOREACH(acq, &spacqtree, chain) {
5642 if (key_cmpspidx_exactly(spidx, &acq->spidx))
5643 return acq;
5644 }
5645
5646 return NULL;
5647 }
5648
5649 /*
5650 * SADB_ACQUIRE processing,
5651 * in first situation, is receiving
5652 * <base>
5653 * from the ikmpd, and clear sequence of its secasvar entry.
5654 *
5655 * In second situation, is receiving
5656 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5657 * from a user land process, and return
5658 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal>
5659 * to the socket.
5660 *
5661 * m will always be freed.
5662 */
5663 static int
5664 key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
5665 {
5666 const struct sadb_address *src0, *dst0;
5667 struct secasindex saidx;
5668 struct secashead *sah;
5669 u_int16_t proto;
5670 int error;
5671
5672 /* sanity check */
5673 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5674 panic("key_acquire2: NULL pointer is passed.\n");
5675
5676 /*
5677 * Error message from KMd.
5678 * We assume that if error was occured in IKEd, the length of PFKEY
5679 * message is equal to the size of sadb_msg structure.
5680 * We do not raise error even if error occured in this function.
5681 */
5682 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) {
5683 #ifndef IPSEC_NONBLOCK_ACQUIRE
5684 struct secacq *acq;
5685
5686 /* check sequence number */
5687 if (mhp->msg->sadb_msg_seq == 0) {
5688 ipseclog((LOG_DEBUG, "key_acquire2: must specify sequence number.\n"));
5689 m_freem(m);
5690 return 0;
5691 }
5692
5693 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) {
5694 /*
5695 * the specified larval SA is already gone, or we got
5696 * a bogus sequence number. we can silently ignore it.
5697 */
5698 m_freem(m);
5699 return 0;
5700 }
5701
5702 /* reset acq counter in order to deletion by timehander. */
5703 acq->created = time_second;
5704 acq->count = 0;
5705 #endif
5706 m_freem(m);
5707 return 0;
5708 }
5709
5710 /*
5711 * This message is from user land.
5712 */
5713
5714 /* map satype to proto */
5715 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
5716 ipseclog((LOG_DEBUG, "key_acquire2: invalid satype is passed.\n"));
5717 return key_senderror(so, m, EINVAL);
5718 }
5719
5720 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
5721 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
5722 mhp->ext[SADB_EXT_PROPOSAL] == NULL) {
5723 /* error */
5724 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
5725 return key_senderror(so, m, EINVAL);
5726 }
5727 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
5728 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
5729 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) {
5730 /* error */
5731 ipseclog((LOG_DEBUG, "key_acquire2: invalid message is passed.\n"));
5732 return key_senderror(so, m, EINVAL);
5733 }
5734
5735 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
5736 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
5737
5738 /* XXX boundary check against sa_len */
5739 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx);
5740
5741 /* get a SA index */
5742 LIST_FOREACH(sah, &sahtree, chain) {
5743 if (sah->state == SADB_SASTATE_DEAD)
5744 continue;
5745 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID))
5746 break;
5747 }
5748 if (sah != NULL) {
5749 ipseclog((LOG_DEBUG, "key_acquire2: a SA exists already.\n"));
5750 return key_senderror(so, m, EEXIST);
5751 }
5752
5753 error = key_acquire(&saidx, NULL);
5754 if (error != 0) {
5755 ipseclog((LOG_DEBUG, "key_acquire2: error %d returned "
5756 "from key_acquire.\n", mhp->msg->sadb_msg_errno));
5757 return key_senderror(so, m, error);
5758 }
5759
5760 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED);
5761 }
5762
5763 /*
5764 * SADB_REGISTER processing.
5765 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported.
5766 * receive
5767 * <base>
5768 * from the ikmpd, and register a socket to send PF_KEY messages,
5769 * and send
5770 * <base, supported>
5771 * to KMD by PF_KEY.
5772 * If socket is detached, must free from regnode.
5773 *
5774 * m will always be freed.
5775 */
5776 static int
5777 key_register(struct socket *so, struct mbuf *m,
5778 const struct sadb_msghdr *mhp)
5779 {
5780 struct secreg *reg, *newreg = 0;
5781
5782 /* sanity check */
5783 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5784 panic("key_register: NULL pointer is passed.\n");
5785
5786 /* check for invalid register message */
5787 if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0]))
5788 return key_senderror(so, m, EINVAL);
5789
5790 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */
5791 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC)
5792 goto setmsg;
5793
5794 /* check whether existing or not */
5795 LIST_FOREACH(reg, &regtree[mhp->msg->sadb_msg_satype], chain) {
5796 if (reg->so == so) {
5797 ipseclog((LOG_DEBUG, "key_register: socket exists already.\n"));
5798 return key_senderror(so, m, EEXIST);
5799 }
5800 }
5801
5802 /* create regnode */
5803 KMALLOC(newreg, struct secreg *, sizeof(*newreg));
5804 if (newreg == NULL) {
5805 ipseclog((LOG_DEBUG, "key_register: No more memory.\n"));
5806 return key_senderror(so, m, ENOBUFS);
5807 }
5808 bzero((caddr_t)newreg, sizeof(*newreg));
5809
5810 newreg->so = so;
5811 ((struct keycb *)sotorawcb(so))->kp_registered++;
5812
5813 /* add regnode to regtree. */
5814 LIST_INSERT_HEAD(&regtree[mhp->msg->sadb_msg_satype], newreg, chain);
5815
5816 setmsg:
5817 {
5818 struct mbuf *n;
5819 struct sadb_msg *newmsg;
5820 struct sadb_supported *sup;
5821 u_int len, alen, elen;
5822 int off;
5823 int i;
5824 struct sadb_alg *alg;
5825
5826 /* create new sadb_msg to reply. */
5827 alen = 0;
5828 for (i = 1; i <= SADB_AALG_MAX; i++) {
5829 if (ah_algorithm_lookup(i))
5830 alen += sizeof(struct sadb_alg);
5831 }
5832 if (alen)
5833 alen += sizeof(struct sadb_supported);
5834 elen = 0;
5835 for (i = 1; i <= SADB_EALG_MAX; i++) {
5836 if (esp_algorithm_lookup(i))
5837 elen += sizeof(struct sadb_alg);
5838 }
5839 if (elen)
5840 elen += sizeof(struct sadb_supported);
5841
5842 len = sizeof(struct sadb_msg) + alen + elen;
5843
5844 if (len > MCLBYTES)
5845 return key_senderror(so, m, ENOBUFS);
5846 n = m_getb(len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
5847 if (!n)
5848 return key_senderror(so, m, ENOBUFS);
5849 n->m_pkthdr.len = n->m_len = len;
5850
5851 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
5852 newmsg = mtod(n, struct sadb_msg *);
5853 newmsg->sadb_msg_errno = 0;
5854 newmsg->sadb_msg_len = PFKEY_UNIT64(len);
5855 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
5856
5857 /* for authentication algorithm */
5858 if (alen) {
5859 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
5860 sup->sadb_supported_len = PFKEY_UNIT64(alen);
5861 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH;
5862 off += PFKEY_ALIGN8(sizeof(*sup));
5863
5864 for (i = 1; i <= SADB_AALG_MAX; i++) {
5865 struct auth_hash *aalgo;
5866 u_int16_t minkeysize, maxkeysize;
5867
5868 aalgo = ah_algorithm_lookup(i);
5869 if (!aalgo)
5870 continue;
5871 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
5872 alg->sadb_alg_id = i;
5873 alg->sadb_alg_ivlen = 0;
5874 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize);
5875 alg->sadb_alg_minbits = _BITS(minkeysize);
5876 alg->sadb_alg_maxbits = _BITS(maxkeysize);
5877 off += PFKEY_ALIGN8(sizeof(*alg));
5878 }
5879 }
5880
5881 /* for encryption algorithm */
5882 if (elen) {
5883 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off);
5884 sup->sadb_supported_len = PFKEY_UNIT64(elen);
5885 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT;
5886 off += PFKEY_ALIGN8(sizeof(*sup));
5887
5888 for (i = 1; i <= SADB_EALG_MAX; i++) {
5889 struct enc_xform *ealgo;
5890
5891 ealgo = esp_algorithm_lookup(i);
5892 if (!ealgo)
5893 continue;
5894 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off);
5895 alg->sadb_alg_id = i;
5896 alg->sadb_alg_ivlen = ealgo->blocksize;
5897 alg->sadb_alg_minbits = _BITS(ealgo->minkey);
5898 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey);
5899 off += PFKEY_ALIGN8(sizeof(struct sadb_alg));
5900 }
5901 }
5902
5903 #ifdef DIGAGNOSTIC
5904 if (off != len)
5905 panic("length assumption failed in key_register");
5906 #endif
5907
5908 m_freem(m);
5909 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED);
5910 }
5911 }
5912
5913 /*
5914 * free secreg entry registered.
5915 * XXX: I want to do free a socket marked done SADB_RESIGER to socket.
5916 */
5917 void
5918 key_freereg(struct socket *so)
5919 {
5920 struct secreg *reg;
5921 int i;
5922
5923 /* sanity check */
5924 if (so == NULL)
5925 panic("key_freereg: NULL pointer is passed.\n");
5926
5927 /*
5928 * check whether existing or not.
5929 * check all type of SA, because there is a potential that
5930 * one socket is registered to multiple type of SA.
5931 */
5932 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
5933 LIST_FOREACH(reg, &regtree[i], chain) {
5934 if (reg->so == so
5935 && __LIST_CHAINED(reg)) {
5936 LIST_REMOVE(reg, chain);
5937 KFREE(reg);
5938 break;
5939 }
5940 }
5941 }
5942
5943 return;
5944 }
5945
5946 /*
5947 * SADB_EXPIRE processing
5948 * send
5949 * <base, SA, SA2, lifetime(C and one of HS), address(SD)>
5950 * to KMD by PF_KEY.
5951 * NOTE: We send only soft lifetime extension.
5952 *
5953 * OUT: 0 : succeed
5954 * others : error number
5955 */
5956 static int
5957 key_expire(struct secasvar *sav)
5958 {
5959
5960 int satype;
5961 struct mbuf *result = NULL, *m;
5962 int len;
5963 int error = -1;
5964 struct sadb_lifetime *lt;
5965
5966 /* XXX: Why do we lock ? */
5967 crit_enter();
5968
5969 /* sanity check */
5970 if (sav == NULL)
5971 panic("key_expire: NULL pointer is passed.\n");
5972 if (sav->sah == NULL)
5973 panic("key_expire: Why was SA index in SA NULL.\n");
5974 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0)
5975 panic("key_expire: invalid proto is passed.\n");
5976
5977 /* set msg header */
5978 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt);
5979 if (!m) {
5980 error = ENOBUFS;
5981 goto fail;
5982 }
5983 result = m;
5984
5985 /* create SA extension */
5986 m = key_setsadbsa(sav);
5987 if (!m) {
5988 error = ENOBUFS;
5989 goto fail;
5990 }
5991 m_cat(result, m);
5992
5993 /* create SA extension */
5994 m = key_setsadbxsa2(sav->sah->saidx.mode,
5995 sav->replay ? sav->replay->count : 0,
5996 sav->sah->saidx.reqid);
5997 if (!m) {
5998 error = ENOBUFS;
5999 goto fail;
6000 }
6001 m_cat(result, m);
6002
6003 /* create lifetime extension (current and soft) */
6004 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
6005 m = key_alloc_mbuf(len);
6006 if (!m || m->m_next) { /*XXX*/
6007 if (m)
6008 m_freem(m);
6009 error = ENOBUFS;
6010 goto fail;
6011 }
6012 bzero(mtod(m, caddr_t), len);
6013 lt = mtod(m, struct sadb_lifetime *);
6014 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
6015 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
6016 lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations;
6017 lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes;
6018 lt->sadb_lifetime_addtime = sav->lft_c->sadb_lifetime_addtime;
6019 lt->sadb_lifetime_usetime = sav->lft_c->sadb_lifetime_usetime;
6020 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
6021 bcopy(sav->lft_s, lt, sizeof(*lt));
6022 m_cat(result, m);
6023
6024 /* set sadb_address for source */
6025 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
6026 &sav->sah->saidx.src.sa,
6027 FULLMASK, IPSEC_ULPROTO_ANY);
6028 if (!m) {
6029 error = ENOBUFS;
6030 goto fail;
6031 }
6032 m_cat(result, m);
6033
6034 /* set sadb_address for destination */
6035 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
6036 &sav->sah->saidx.dst.sa,
6037 FULLMASK, IPSEC_ULPROTO_ANY);
6038 if (!m) {
6039 error = ENOBUFS;
6040 goto fail;
6041 }
6042 m_cat(result, m);
6043
6044 if ((result->m_flags & M_PKTHDR) == 0) {
6045 error = EINVAL;
6046 goto fail;
6047 }
6048
6049 if (result->m_len < sizeof(struct sadb_msg)) {
6050 result = m_pullup(result, sizeof(struct sadb_msg));
6051 if (result == NULL) {
6052 error = ENOBUFS;
6053 goto fail;
6054 }
6055 }
6056 result->m_pkthdr.len = m_lengthm(result, NULL);
6057 mtod(result, struct sadb_msg *)->sadb_msg_len =
6058 PFKEY_UNIT64(result->m_pkthdr.len);
6059
6060 crit_exit();
6061 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
6062
6063 fail:
6064 if (result)
6065 m_freem(result);
6066 crit_exit();
6067 return error;
6068 }
6069
6070 /*
6071 * SADB_FLUSH processing
6072 * receive
6073 * <base>
6074 * from the ikmpd, and free all entries in secastree.
6075 * and send,
6076 * <base>
6077 * to the ikmpd.
6078 * NOTE: to do is only marking SADB_SASTATE_DEAD.
6079 *
6080 * m will always be freed.
6081 */
6082 static int
6083 key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6084 {
6085 struct sadb_msg *newmsg;
6086 struct secashead *sah;
6087 u_int16_t proto;
6088 u_int stateidx;
6089
6090 /* sanity check */
6091 if (so == NULL || mhp == NULL || mhp->msg == NULL)
6092 panic("key_flush: NULL pointer is passed.\n");
6093
6094 /* map satype to proto */
6095 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6096 ipseclog((LOG_DEBUG, "key_flush: invalid satype is passed.\n"));
6097 return key_senderror(so, m, EINVAL);
6098 }
6099
6100 /* no SATYPE specified, i.e. flushing all SA. */
6101 LIST_FOREACH(sah, &sahtree, chain) {
6102 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
6103 proto != sah->saidx.proto)
6104 continue;
6105
6106 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_alive);
6107 stateidx++) {
6108 struct secasvar *sav, *nextsav;
6109 u_int8_t state = saorder_state_any[stateidx];
6110
6111 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain,
6112 nextsav) {
6113 key_sa_chgstate(sav, SADB_SASTATE_DEAD);
6114 KEY_FREESAV(&sav);
6115 }
6116 }
6117
6118 sah->state = SADB_SASTATE_DEAD;
6119 }
6120
6121 if (m->m_len < sizeof(struct sadb_msg) ||
6122 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
6123 ipseclog((LOG_DEBUG, "key_flush: No more memory.\n"));
6124 return key_senderror(so, m, ENOBUFS);
6125 }
6126
6127 if (m->m_next)
6128 m_freem(m->m_next);
6129 m->m_next = NULL;
6130 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg);
6131 newmsg = mtod(m, struct sadb_msg *);
6132 newmsg->sadb_msg_errno = 0;
6133 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
6134
6135 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6136 }
6137
6138 /*
6139 * SADB_DUMP processing
6140 * dump all entries including status of DEAD in SAD.
6141 * receive
6142 * <base>
6143 * from the ikmpd, and dump all secasvar leaves
6144 * and send,
6145 * <base> .....
6146 * to the ikmpd.
6147 *
6148 * m will always be freed.
6149 */
6150 static int
6151 key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6152 {
6153 struct secashead *sah;
6154 struct secasvar *sav;
6155 u_int16_t proto;
6156 u_int stateidx;
6157 u_int8_t satype;
6158 u_int8_t state;
6159 int cnt;
6160 struct sadb_msg *newmsg;
6161 struct mbuf *n;
6162
6163 /* sanity check */
6164 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6165 panic("key_dump: NULL pointer is passed.\n");
6166
6167 /* map satype to proto */
6168 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6169 ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n"));
6170 return key_senderror(so, m, EINVAL);
6171 }
6172
6173 /* count sav entries to be sent to the userland. */
6174 cnt = 0;
6175 LIST_FOREACH(sah, &sahtree, chain) {
6176 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
6177 proto != sah->saidx.proto)
6178 continue;
6179
6180 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any);
6181 stateidx++) {
6182 state = saorder_state_any[stateidx];
6183 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6184 cnt++;
6185 }
6186 }
6187 }
6188
6189 if (cnt == 0)
6190 return key_senderror(so, m, ENOENT);
6191
6192 /* send this to the userland, one at a time. */
6193 newmsg = NULL;
6194 LIST_FOREACH(sah, &sahtree, chain) {
6195 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6196 && proto != sah->saidx.proto)
6197 continue;
6198
6199 /* map proto to satype */
6200 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
6201 ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in SAD.\n"));
6202 return key_senderror(so, m, EINVAL);
6203 }
6204
6205 for (stateidx = 0; stateidx < _ARRAYLEN(saorder_state_any);
6206 stateidx++) {
6207 state = saorder_state_any[stateidx];
6208 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6209 n = key_setdumpsa(sav, SADB_DUMP, satype,
6210 --cnt, mhp->msg->sadb_msg_pid);
6211 if (!n)
6212 return key_senderror(so, m, ENOBUFS);
6213
6214 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6215 }
6216 }
6217 }
6218
6219 m_freem(m);
6220 return 0;
6221 }
6222
6223 /*
6224 * SADB_X_PROMISC processing
6225 *
6226 * m will always be freed.
6227 */
6228 static int
6229 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6230 {
6231 int olen;
6232
6233 /* sanity check */
6234 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6235 panic("key_promisc: NULL pointer is passed.\n");
6236
6237 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6238
6239 if (olen < sizeof(struct sadb_msg)) {
6240 #if 1
6241 return key_senderror(so, m, EINVAL);
6242 #else
6243 m_freem(m);
6244 return 0;
6245 #endif
6246 } else if (olen == sizeof(struct sadb_msg)) {
6247 /* enable/disable promisc mode */
6248 struct keycb *kp;
6249
6250 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
6251 return key_senderror(so, m, EINVAL);
6252 mhp->msg->sadb_msg_errno = 0;
6253 switch (mhp->msg->sadb_msg_satype) {
6254 case 0:
6255 case 1:
6256 kp->kp_promisc = mhp->msg->sadb_msg_satype;
6257 break;
6258 default:
6259 return key_senderror(so, m, EINVAL);
6260 }
6261
6262 /* send the original message back to everyone */
6263 mhp->msg->sadb_msg_errno = 0;
6264 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6265 } else {
6266 /* send packet as is */
6267
6268 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
6269
6270 /* TODO: if sadb_msg_seq is specified, send to specific pid */
6271 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6272 }
6273 }
6274
6275 static int (*key_typesw[]) (struct socket *, struct mbuf *,
6276 const struct sadb_msghdr *) = {
6277 NULL, /* SADB_RESERVED */
6278 key_getspi, /* SADB_GETSPI */
6279 key_update, /* SADB_UPDATE */
6280 key_add, /* SADB_ADD */
6281 key_delete, /* SADB_DELETE */
6282 key_get, /* SADB_GET */
6283 key_acquire2, /* SADB_ACQUIRE */
6284 key_register, /* SADB_REGISTER */
6285 NULL, /* SADB_EXPIRE */
6286 key_flush, /* SADB_FLUSH */
6287 key_dump, /* SADB_DUMP */
6288 key_promisc, /* SADB_X_PROMISC */
6289 NULL, /* SADB_X_PCHANGE */
6290 key_spdadd, /* SADB_X_SPDUPDATE */
6291 key_spdadd, /* SADB_X_SPDADD */
6292 key_spddelete, /* SADB_X_SPDDELETE */
6293 key_spdget, /* SADB_X_SPDGET */
6294 NULL, /* SADB_X_SPDACQUIRE */
6295 key_spddump, /* SADB_X_SPDDUMP */
6296 key_spdflush, /* SADB_X_SPDFLUSH */
6297 key_spdadd, /* SADB_X_SPDSETIDX */
6298 NULL, /* SADB_X_SPDEXPIRE */
6299 key_spddelete2, /* SADB_X_SPDDELETE2 */
6300 };
6301
6302 /*
6303 * parse sadb_msg buffer to process PFKEYv2,
6304 * and create a data to response if needed.
6305 * I think to be dealed with mbuf directly.
6306 * IN:
6307 * msgp : pointer to pointer to a received buffer pulluped.
6308 * This is rewrited to response.
6309 * so : pointer to socket.
6310 * OUT:
6311 * length for buffer to send to user process.
6312 */
6313 int
6314 key_parse(struct mbuf *m, struct socket *so)
6315 {
6316 struct sadb_msg *msg;
6317 struct sadb_msghdr mh;
6318 u_int orglen;
6319 int error;
6320 int target;
6321
6322 /* sanity check */
6323 if (m == NULL || so == NULL)
6324 panic("key_parse: NULL pointer is passed.\n");
6325
6326 #if 0 /*kdebug_sadb assumes msg in linear buffer*/
6327 KEYDEBUG(KEYDEBUG_KEY_DUMP,
6328 ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n"));
6329 kdebug_sadb(msg));
6330 #endif
6331
6332 if (m->m_len < sizeof(struct sadb_msg)) {
6333 m = m_pullup(m, sizeof(struct sadb_msg));
6334 if (!m)
6335 return ENOBUFS;
6336 }
6337 msg = mtod(m, struct sadb_msg *);
6338 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
6339 target = KEY_SENDUP_ONE;
6340
6341 if ((m->m_flags & M_PKTHDR) == 0 ||
6342 m->m_pkthdr.len != m->m_pkthdr.len) {
6343 ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n"));
6344 pfkeystat.out_invlen++;
6345 error = EINVAL;
6346 goto senderror;
6347 }
6348
6349 if (msg->sadb_msg_version != PF_KEY_V2) {
6350 ipseclog((LOG_DEBUG,
6351 "key_parse: PF_KEY version %u is mismatched.\n",
6352 msg->sadb_msg_version));
6353 pfkeystat.out_invver++;
6354 error = EINVAL;
6355 goto senderror;
6356 }
6357
6358 if (msg->sadb_msg_type > SADB_MAX) {
6359 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6360 msg->sadb_msg_type));
6361 pfkeystat.out_invmsgtype++;
6362 error = EINVAL;
6363 goto senderror;
6364 }
6365
6366 /* for old-fashioned code - should be nuked */
6367 if (m->m_pkthdr.len > MCLBYTES) {
6368 m_freem(m);
6369 return ENOBUFS;
6370 }
6371 if (m->m_next) {
6372 struct mbuf *n;
6373
6374 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_DATA, M_PKTHDR);
6375 if (!n) {
6376 m_freem(m);
6377 return ENOBUFS;
6378 }
6379 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
6380 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
6381 m_freem(m);
6382 m = n;
6383 }
6384
6385 /* align the mbuf chain so that extensions are in contiguous region. */
6386 error = key_align(m, &mh);
6387 if (error)
6388 return error;
6389
6390 msg = mh.msg;
6391
6392 /* check SA type */
6393 switch (msg->sadb_msg_satype) {
6394 case SADB_SATYPE_UNSPEC:
6395 switch (msg->sadb_msg_type) {
6396 case SADB_GETSPI:
6397 case SADB_UPDATE:
6398 case SADB_ADD:
6399 case SADB_DELETE:
6400 case SADB_GET:
6401 case SADB_ACQUIRE:
6402 case SADB_EXPIRE:
6403 ipseclog((LOG_DEBUG, "key_parse: must specify satype "
6404 "when msg type=%u.\n", msg->sadb_msg_type));
6405 pfkeystat.out_invsatype++;
6406 error = EINVAL;
6407 goto senderror;
6408 }
6409 break;
6410 case SADB_SATYPE_AH:
6411 case SADB_SATYPE_ESP:
6412 case SADB_X_SATYPE_IPCOMP:
6413 switch (msg->sadb_msg_type) {
6414 case SADB_X_SPDADD:
6415 case SADB_X_SPDDELETE:
6416 case SADB_X_SPDGET:
6417 case SADB_X_SPDDUMP:
6418 case SADB_X_SPDFLUSH:
6419 case SADB_X_SPDSETIDX:
6420 case SADB_X_SPDUPDATE:
6421 case SADB_X_SPDDELETE2:
6422 ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n",
6423 msg->sadb_msg_type));
6424 pfkeystat.out_invsatype++;
6425 error = EINVAL;
6426 goto senderror;
6427 }
6428 break;
6429 case SADB_SATYPE_RSVP:
6430 case SADB_SATYPE_OSPFV2:
6431 case SADB_SATYPE_RIPV2:
6432 case SADB_SATYPE_MIP:
6433 ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n",
6434 msg->sadb_msg_satype));
6435 pfkeystat.out_invsatype++;
6436 error = EOPNOTSUPP;
6437 goto senderror;
6438 case 1: /* XXX: What does it do? */
6439 if (msg->sadb_msg_type == SADB_X_PROMISC)
6440 break;
6441 /*FALLTHROUGH*/
6442 default:
6443 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6444 msg->sadb_msg_satype));
6445 pfkeystat.out_invsatype++;
6446 error = EINVAL;
6447 goto senderror;
6448 }
6449
6450 /* check field of upper layer protocol and address family */
6451 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
6452 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
6453 struct sadb_address *src0, *dst0;
6454 u_int plen;
6455
6456 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
6457 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
6458
6459 /* check upper layer protocol */
6460 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
6461 ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n"));
6462 pfkeystat.out_invaddr++;
6463 error = EINVAL;
6464 goto senderror;
6465 }
6466
6467 /* check family */
6468 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
6469 PFKEY_ADDR_SADDR(dst0)->sa_family) {
6470 ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n"));
6471 pfkeystat.out_invaddr++;
6472 error = EINVAL;
6473 goto senderror;
6474 }
6475 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6476 PFKEY_ADDR_SADDR(dst0)->sa_len) {
6477 ipseclog((LOG_DEBUG,
6478 "key_parse: address struct size mismatched.\n"));
6479 pfkeystat.out_invaddr++;
6480 error = EINVAL;
6481 goto senderror;
6482 }
6483
6484 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6485 case AF_INET:
6486 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6487 sizeof(struct sockaddr_in)) {
6488 pfkeystat.out_invaddr++;
6489 error = EINVAL;
6490 goto senderror;
6491 }
6492 break;
6493 case AF_INET6:
6494 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6495 sizeof(struct sockaddr_in6)) {
6496 pfkeystat.out_invaddr++;
6497 error = EINVAL;
6498 goto senderror;
6499 }
6500 break;
6501 default:
6502 ipseclog((LOG_DEBUG,
6503 "key_parse: unsupported address family.\n"));
6504 pfkeystat.out_invaddr++;
6505 error = EAFNOSUPPORT;
6506 goto senderror;
6507 }
6508
6509 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6510 case AF_INET:
6511 plen = sizeof(struct in_addr) << 3;
6512 break;
6513 case AF_INET6:
6514 plen = sizeof(struct in6_addr) << 3;
6515 break;
6516 default:
6517 plen = 0; /*fool gcc*/
6518 break;
6519 }
6520
6521 /* check max prefix length */
6522 if (src0->sadb_address_prefixlen > plen ||
6523 dst0->sadb_address_prefixlen > plen) {
6524 ipseclog((LOG_DEBUG,
6525 "key_parse: illegal prefixlen.\n"));
6526 pfkeystat.out_invaddr++;
6527 error = EINVAL;
6528 goto senderror;
6529 }
6530
6531 /*
6532 * prefixlen == 0 is valid because there can be a case when
6533 * all addresses are matched.
6534 */
6535 }
6536
6537 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) ||
6538 key_typesw[msg->sadb_msg_type] == NULL) {
6539 pfkeystat.out_invmsgtype++;
6540 error = EINVAL;
6541 goto senderror;
6542 }
6543
6544 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
6545
6546 senderror:
6547 msg->sadb_msg_errno = error;
6548 return key_sendup_mbuf(so, m, target);
6549 }
6550
6551 static int
6552 key_senderror(struct socket *so, struct mbuf *m, int code)
6553 {
6554 struct sadb_msg *msg;
6555
6556 if (m->m_len < sizeof(struct sadb_msg))
6557 panic("invalid mbuf passed to key_senderror");
6558
6559 msg = mtod(m, struct sadb_msg *);
6560 msg->sadb_msg_errno = code;
6561 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
6562 }
6563
6564 /*
6565 * set the pointer to each header into message buffer.
6566 * m will be freed on error.
6567 * XXX larger-than-MCLBYTES extension?
6568 */
6569 static int
6570 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
6571 {
6572 struct mbuf *n;
6573 struct sadb_ext *ext;
6574 size_t off, end;
6575 int extlen;
6576 int toff;
6577
6578 /* sanity check */
6579 if (m == NULL || mhp == NULL)
6580 panic("key_align: NULL pointer is passed.\n");
6581 if (m->m_len < sizeof(struct sadb_msg))
6582 panic("invalid mbuf passed to key_align");
6583
6584 /* initialize */
6585 bzero(mhp, sizeof(*mhp));
6586
6587 mhp->msg = mtod(m, struct sadb_msg *);
6588 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
6589
6590 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6591 extlen = end; /*just in case extlen is not updated*/
6592 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
6593 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
6594 if (!n) {
6595 /* m is already freed */
6596 return ENOBUFS;
6597 }
6598 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6599
6600 /* set pointer */
6601 switch (ext->sadb_ext_type) {
6602 case SADB_EXT_SA:
6603 case SADB_EXT_ADDRESS_SRC:
6604 case SADB_EXT_ADDRESS_DST:
6605 case SADB_EXT_ADDRESS_PROXY:
6606 case SADB_EXT_LIFETIME_CURRENT:
6607 case SADB_EXT_LIFETIME_HARD:
6608 case SADB_EXT_LIFETIME_SOFT:
6609 case SADB_EXT_KEY_AUTH:
6610 case SADB_EXT_KEY_ENCRYPT:
6611 case SADB_EXT_IDENTITY_SRC:
6612 case SADB_EXT_IDENTITY_DST:
6613 case SADB_EXT_SENSITIVITY:
6614 case SADB_EXT_PROPOSAL:
6615 case SADB_EXT_SUPPORTED_AUTH:
6616 case SADB_EXT_SUPPORTED_ENCRYPT:
6617 case SADB_EXT_SPIRANGE:
6618 case SADB_X_EXT_POLICY:
6619 case SADB_X_EXT_SA2:
6620 /* duplicate check */
6621 /*
6622 * XXX Are there duplication payloads of either
6623 * KEY_AUTH or KEY_ENCRYPT ?
6624 */
6625 if (mhp->ext[ext->sadb_ext_type] != NULL) {
6626 ipseclog((LOG_DEBUG,
6627 "key_align: duplicate ext_type %u "
6628 "is passed.\n", ext->sadb_ext_type));
6629 m_freem(m);
6630 pfkeystat.out_dupext++;
6631 return EINVAL;
6632 }
6633 break;
6634 default:
6635 ipseclog((LOG_DEBUG,
6636 "key_align: invalid ext_type %u is passed.\n",
6637 ext->sadb_ext_type));
6638 m_freem(m);
6639 pfkeystat.out_invexttype++;
6640 return EINVAL;
6641 }
6642
6643 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
6644
6645 if (key_validate_ext(ext, extlen)) {
6646 m_freem(m);
6647 pfkeystat.out_invlen++;
6648 return EINVAL;
6649 }
6650
6651 n = m_pulldown(m, off, extlen, &toff);
6652 if (!n) {
6653 /* m is already freed */
6654 return ENOBUFS;
6655 }
6656 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6657
6658 mhp->ext[ext->sadb_ext_type] = ext;
6659 mhp->extoff[ext->sadb_ext_type] = off;
6660 mhp->extlen[ext->sadb_ext_type] = extlen;
6661 }
6662
6663 if (off != end) {
6664 m_freem(m);
6665 pfkeystat.out_invlen++;
6666 return EINVAL;
6667 }
6668
6669 return 0;
6670 }
6671
6672 static int
6673 key_validate_ext(const struct sadb_ext *ext, int len)
6674 {
6675 const struct sockaddr *sa;
6676 enum { NONE, ADDR } checktype = NONE;
6677 int baselen = 0;
6678 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
6679
6680 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
6681 return EINVAL;
6682
6683 /* if it does not match minimum/maximum length, bail */
6684 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) ||
6685 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0]))
6686 return EINVAL;
6687 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
6688 return EINVAL;
6689 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
6690 return EINVAL;
6691
6692 /* more checks based on sadb_ext_type XXX need more */
6693 switch (ext->sadb_ext_type) {
6694 case SADB_EXT_ADDRESS_SRC:
6695 case SADB_EXT_ADDRESS_DST:
6696 case SADB_EXT_ADDRESS_PROXY:
6697 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
6698 checktype = ADDR;
6699 break;
6700 case SADB_EXT_IDENTITY_SRC:
6701 case SADB_EXT_IDENTITY_DST:
6702 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
6703 SADB_X_IDENTTYPE_ADDR) {
6704 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
6705 checktype = ADDR;
6706 } else
6707 checktype = NONE;
6708 break;
6709 default:
6710 checktype = NONE;
6711 break;
6712 }
6713
6714 switch (checktype) {
6715 case NONE:
6716 break;
6717 case ADDR:
6718 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
6719 if (len < baselen + sal)
6720 return EINVAL;
6721 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
6722 return EINVAL;
6723 break;
6724 }
6725
6726 return 0;
6727 }
6728
6729 void
6730 key_init(void)
6731 {
6732 int i;
6733
6734 for (i = 0; i < IPSEC_DIR_MAX; i++) {
6735 LIST_INIT(&sptree[i]);
6736 }
6737
6738 LIST_INIT(&sahtree);
6739
6740 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
6741 LIST_INIT(&regtree[i]);
6742 }
6743
6744 #ifndef IPSEC_NONBLOCK_ACQUIRE
6745 LIST_INIT(&acqtree);
6746 #endif
6747 LIST_INIT(&spacqtree);
6748
6749 /* system default */
6750 ip4_def_policy.policy = IPSEC_POLICY_NONE;
6751 ip4_def_policy.refcnt++; /*never reclaim this*/
6752
6753 #ifndef IPSEC_DEBUG2
6754 callout_init(&key_timehandler_ch);
6755 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL);
6756 #endif /*IPSEC_DEBUG2*/
6757
6758 /* initialize key statistics */
6759 keystat.getspi_count = 1;
6760
6761 kprintf("IPsec: Initialized Security Association Processing.\n");
6762
6763 return;
6764 }
6765
6766 /*
6767 * XXX: maybe This function is called after INBOUND IPsec processing.
6768 *
6769 * Special check for tunnel-mode packets.
6770 * We must make some checks for consistency between inner and outer IP header.
6771 *
6772 * xxx more checks to be provided
6773 */
6774 int
6775 key_checktunnelsanity(struct secasvar *sav, u_int family, caddr_t src,
6776 caddr_t dst)
6777 {
6778 /* sanity check */
6779 if (sav->sah == NULL)
6780 panic("sav->sah == NULL at key_checktunnelsanity");
6781
6782 /* XXX: check inner IP header */
6783
6784 return 1;
6785 }
6786
6787 #if 0
6788 #define hostnamelen strlen(hostname)
6789
6790 /*
6791 * Get FQDN for the host.
6792 * If the administrator configured hostname (by hostname(1)) without
6793 * domain name, returns nothing.
6794 */
6795 static const char *
6796 key_getfqdn(void)
6797 {
6798 int i;
6799 int hasdot;
6800 static char fqdn[MAXHOSTNAMELEN + 1];
6801
6802 if (!hostnamelen)
6803 return NULL;
6804
6805 /* check if it comes with domain name. */
6806 hasdot = 0;
6807 for (i = 0; i < hostnamelen; i++) {
6808 if (hostname[i] == '.')
6809 hasdot++;
6810 }
6811 if (!hasdot)
6812 return NULL;
6813
6814 /* NOTE: hostname may not be NUL-terminated. */
6815 bzero(fqdn, sizeof(fqdn));
6816 bcopy(hostname, fqdn, hostnamelen);
6817 fqdn[hostnamelen] = '\0';
6818 return fqdn;
6819 }
6820
6821 /*
6822 * get username@FQDN for the host/user.
6823 */
6824 static const char *
6825 key_getuserfqdn(void)
6826 {
6827 const char *host;
6828 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2];
6829 struct proc *p = curproc;
6830 char *q;
6831
6832 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session)
6833 return NULL;
6834 if (!(host = key_getfqdn()))
6835 return NULL;
6836
6837 /* NOTE: s_login may not be-NUL terminated. */
6838 bzero(userfqdn, sizeof(userfqdn));
6839 bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME);
6840 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */
6841 q = userfqdn + strlen(userfqdn);
6842 *q++ = '@';
6843 bcopy(host, q, strlen(host));
6844 q += strlen(host);
6845 *q++ = '\0';
6846
6847 return userfqdn;
6848 }
6849 #endif
6850
6851 /* record data transfer on SA, and update timestamps */
6852 void
6853 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
6854 {
6855 KASSERT(sav != NULL, ("key_sa_recordxfer: Null secasvar"));
6856 KASSERT(m != NULL, ("key_sa_recordxfer: Null mbuf"));
6857 if (!sav->lft_c)
6858 return;
6859
6860 /*
6861 * XXX Currently, there is a difference of bytes size
6862 * between inbound and outbound processing.
6863 */
6864 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len;
6865 /* to check bytes lifetime is done in key_timehandler(). */
6866
6867 /*
6868 * We use the number of packets as the unit of
6869 * sadb_lifetime_allocations. We increment the variable
6870 * whenever {esp,ah}_{in,out}put is called.
6871 */
6872 sav->lft_c->sadb_lifetime_allocations++;
6873 /* XXX check for expires? */
6874
6875 /*
6876 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock,
6877 * in seconds. HARD and SOFT lifetime are measured by the time
6878 * difference (again in seconds) from sadb_lifetime_usetime.
6879 *
6880 * usetime
6881 * v expire expire
6882 * -----+-----+--------+---> t
6883 * <--------------> HARD
6884 * <-----> SOFT
6885 */
6886 sav->lft_c->sadb_lifetime_usetime = time_second;
6887 /* XXX check for expires? */
6888
6889 return;
6890 }
6891
6892 /* dumb version */
6893 void
6894 key_sa_routechange(struct sockaddr *dst)
6895 {
6896 struct secashead *sah;
6897 struct route *ro;
6898
6899 LIST_FOREACH(sah, &sahtree, chain) {
6900 ro = &sah->sa_route;
6901 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len
6902 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
6903 RTFREE(ro->ro_rt);
6904 ro->ro_rt = (struct rtentry *)NULL;
6905 }
6906 }
6907
6908 return;
6909 }
6910
6911 static void
6912 key_sa_chgstate(struct secasvar *sav, u_int8_t state)
6913 {
6914 if (sav == NULL)
6915 panic("key_sa_chgstate called with sav == NULL");
6916
6917 if (sav->state == state)
6918 return;
6919
6920 if (__LIST_CHAINED(sav))
6921 LIST_REMOVE(sav, chain);
6922
6923 sav->state = state;
6924 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
6925 }
6926
6927 void
6928 key_sa_stir_iv(struct secasvar *sav)
6929 {
6930
6931 if (!sav->iv)
6932 panic("key_sa_stir_iv called with sav == NULL");
6933 key_randomfill(sav->iv, sav->ivlen);
6934 }
6935
6936 /* XXX too much? */
6937 static struct mbuf *
6938 key_alloc_mbuf(int l)
6939 {
6940 struct mbuf *m = NULL, *n;
6941 int len, t;
6942
6943 len = l;
6944 while (len > 0) {
6945 n = m_getb(len, MB_DONTWAIT, MT_DATA, 0);
6946 if (!n) {
6947 m_freem(m);
6948 return NULL;
6949 }
6950 n->m_len = 0;
6951 n->m_len = M_TRAILINGSPACE(n);
6952 /* use the bottom of mbuf, hoping we can prepend afterwards */
6953 if (n->m_len > len) {
6954 t = (n->m_len - len) & ~(sizeof(long) - 1);
6955 n->m_data += t;
6956 n->m_len = len;
6957 }
6958
6959 len -= n->m_len;
6960
6961 if (m)
6962 m_cat(m, n);
6963 else
6964 m = n;
6965 }
6966
6967 return m;
6968 }
DragonFly BSD