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kernel: Disable TCP_SIGNATURE in preparation for removing IPSEC.
[dragonfly.git] / sys / netproto / ipsec / key.c
blob814f9beb4646e513accc781023b55d2f7e6aeb79
1 /* $FreeBSD: src/sys/netipsec/key.c,v 1.3.2.1 2003/01/24 05:11:35 sam Exp $ */
2 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * This code is referd to RFC 2367
35 */
36
37 #include "opt_inet.h"
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
40
41 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/mbuf.h>
46 #include <sys/domain.h>
47 #include <sys/protosw.h>
48 #include <sys/malloc.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
52 #include <sys/errno.h>
53 #include <sys/proc.h>
54 #include <sys/queue.h>
55 #include <sys/syslog.h>
56
57 #include <net/if.h>
58 #include <net/route.h>
59 #include <net/raw_cb.h>
60
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/ip.h>
64 #include <netinet/in_var.h>
65
66 #ifdef INET6
67 #include <netinet/ip6.h>
68 #include <netinet6/in6_var.h>
69 #include <netinet6/ip6_var.h>
70 #endif /* INET6 */
71
72 #ifdef INET
73 #include <netinet/in_pcb.h>
74 #endif
75 #ifdef INET6
76 #include <netinet6/in6_pcb.h>
77 #endif /* INET6 */
78
79 #include <net/pfkeyv2.h>
80 #include <netproto/ipsec/keydb.h>
81 #include <netproto/ipsec/key.h>
82 #include <netproto/ipsec/keysock.h>
83 #include <netproto/ipsec/key_debug.h>
84
85 #include <netproto/ipsec/ipsec.h>
86 #ifdef INET6
87 #include <netproto/ipsec/ipsec6.h>
88 #endif
89
90 #include <netproto/ipsec/xform.h>
91
92 #include <machine/stdarg.h>
93
94 /* randomness */
95 #include <sys/random.h>
96
97 #include <net/net_osdep.h>
98
99 #define FULLMASK 0xff
100 #define _BITS(bytes) ((bytes) << 3)
101
102 /*
103 * Note on SA reference counting:
104 * - SAs that are not in DEAD state will have (total external reference + 1)
105 * following value in reference count field. they cannot be freed and are
106 * referenced from SA header.
107 * - SAs that are in DEAD state will have (total external reference)
108 * in reference count field. they are ready to be freed. reference from
109 * SA header will be removed in key_delsav(), when the reference count
110 * field hits 0 (= no external reference other than from SA header.
111 */
112
113 #ifndef IPSEC_DEBUG2
114 static struct callout key_timehandler_ch;
115 #endif
116 u_int32_t key_debug_level = 0;
117 static u_int key_spi_trycnt = 1000;
118 static u_int32_t key_spi_minval = 0x100;
119 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */
120 static u_int32_t policy_id = 0;
121 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/
122 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/
123 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/
124 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/
125 static int key_prefered_oldsa = 1; /* prefered old sa rather than new sa.*/
126
127 static u_int32_t acq_seq = 0;
128 static int key_tick_init_random = 0;
129
130 static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */
131 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */
132 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1];
133 /* registed list */
134 #ifndef IPSEC_NONBLOCK_ACQUIRE
135 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */
136 #endif
137 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */
138
139 /* search order for SAs */
140 static u_int saorder_state_valid[] = {
141 SADB_SASTATE_DYING, SADB_SASTATE_MATURE,
142 /*
143 * This order is important because we must select the oldest SA
144 * for outbound processing. For inbound, This is not important.
145 */
146 };
147 static u_int saorder_state_alive[] = {
148 /* except DEAD */
149 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL
150 };
151 static u_int saorder_state_any[] = {
152 SADB_SASTATE_MATURE, SADB_SASTATE_DYING,
153 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD
154 };
155
156 static const int minsize[] = {
157 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
158 sizeof(struct sadb_sa), /* SADB_EXT_SA */
159 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
160 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
161 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
162 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */
163 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */
164 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */
165 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */
166 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */
167 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */
168 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */
169 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */
170 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */
171 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */
172 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */
173 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
174 0, /* SADB_X_EXT_KMPRIVATE */
175 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */
176 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
177 };
178 static const int maxsize[] = {
179 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */
180 sizeof(struct sadb_sa), /* SADB_EXT_SA */
181 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */
182 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */
183 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */
184 0, /* SADB_EXT_ADDRESS_SRC */
185 0, /* SADB_EXT_ADDRESS_DST */
186 0, /* SADB_EXT_ADDRESS_PROXY */
187 0, /* SADB_EXT_KEY_AUTH */
188 0, /* SADB_EXT_KEY_ENCRYPT */
189 0, /* SADB_EXT_IDENTITY_SRC */
190 0, /* SADB_EXT_IDENTITY_DST */
191 0, /* SADB_EXT_SENSITIVITY */
192 0, /* SADB_EXT_PROPOSAL */
193 0, /* SADB_EXT_SUPPORTED_AUTH */
194 0, /* SADB_EXT_SUPPORTED_ENCRYPT */
195 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */
196 0, /* SADB_X_EXT_KMPRIVATE */
197 0, /* SADB_X_EXT_POLICY */
198 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */
199 };
200
201 static int ipsec_esp_keymin = 256;
202 static int ipsec_esp_auth = 0;
203 static int ipsec_ah_keymin = 128;
204
205 #ifdef SYSCTL_DECL
206 SYSCTL_DECL(_net_key);
207 #endif
208
209 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \
210 &key_debug_level, 0, "");
211
212 /* max count of trial for the decision of spi value */
213 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \
214 &key_spi_trycnt, 0, "");
215
216 /* minimum spi value to allocate automatically. */
217 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \
218 &key_spi_minval, 0, "");
219
220 /* maximun spi value to allocate automatically. */
221 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \
222 &key_spi_maxval, 0, "");
223
224 /* interval to initialize randseed */
225 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \
226 &key_int_random, 0, "");
227
228 /* lifetime for larval SA */
229 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \
230 &key_larval_lifetime, 0, "");
231
232 /* counter for blocking to send SADB_ACQUIRE to IKEd */
233 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \
234 &key_blockacq_count, 0, "");
235
236 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */
237 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \
238 &key_blockacq_lifetime, 0, "");
239
240 /* ESP auth */
241 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \
242 &ipsec_esp_auth, 0, "");
243
244 /* minimum ESP key length */
245 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \
246 &ipsec_esp_keymin, 0, "");
247
248 /* minimum AH key length */
249 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \
250 &ipsec_ah_keymin, 0, "");
251
252 /* perfered old SA rather than new SA */
253 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, prefered_oldsa, CTLFLAG_RW,\
254 &key_prefered_oldsa, 0, "");
255
256 #define __LIST_CHAINED(elm) \
257 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL))
258 #define LIST_INSERT_TAIL(head, elm, type, field) \
259 do {\
260 struct type *curelm = LIST_FIRST(head); \
261 if (curelm == NULL) {\
262 LIST_INSERT_HEAD(head, elm, field); \
263 } else { \
264 while (LIST_NEXT(curelm, field)) \
265 curelm = LIST_NEXT(curelm, field);\
266 LIST_INSERT_AFTER(curelm, elm, field);\
267 }\
268 } while (0)
269
270 #define KEY_CHKSASTATE(head, sav, name) \
271 do { \
272 if ((head) != (sav)) { \
273 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \
274 (name), (head), (sav))); \
275 continue; \
276 } \
277 } while (0)
278
279 #define KEY_CHKSPDIR(head, sp, name) \
280 do { \
281 if ((head) != (sp)) { \
282 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \
283 "anyway continue.\n", \
284 (name), (head), (sp))); \
285 } \
286 } while (0)
287
288 MALLOC_DEFINE(M_SECA, "key mgmt", "security associations, key management");
289
290 #if 1
291 #define KMALLOC(p, t, n) \
292 ((p) = (t) kmalloc((unsigned long)(n), M_SECA, M_INTWAIT | M_NULLOK))
293 #define KFREE(p) \
294 kfree((caddr_t)(p), M_SECA)
295 #else
296 #define KMALLOC(p, t, n) \
297 do { \
298 ((p) = (t)kmalloc((unsigned long)(n), M_SECA, M_INTWAIT | M_NULLOK)); \
299 kprintf("%s %d: %p <- KMALLOC(%s, %d)\n", \
300 __FILE__, __LINE__, (p), #t, n); \
301 } while (0)
302
303 #define KFREE(p) \
304 do { \
305 kprintf("%s %d: %p -> KFREE()\n", __FILE__, __LINE__, (p)); \
306 kfree((caddr_t)(p), M_SECA); \
307 } while (0)
308 #endif
309
310 /*
311 * set parameters into secpolicyindex buffer.
312 * Must allocate secpolicyindex buffer passed to this function.
313 */
314 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \
315 do { \
316 bzero((idx), sizeof(struct secpolicyindex)); \
317 (idx)->dir = (_dir); \
318 (idx)->prefs = (ps); \
319 (idx)->prefd = (pd); \
320 (idx)->ul_proto = (ulp); \
321 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
322 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
323 } while (0)
324
325 /*
326 * set parameters into secasindex buffer.
327 * Must allocate secasindex buffer before calling this function.
328 */
329 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \
330 do { \
331 bzero((idx), sizeof(struct secasindex)); \
332 (idx)->proto = (p); \
333 (idx)->mode = (m); \
334 (idx)->reqid = (r); \
335 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \
336 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \
337 } while (0)
338
339 /* key statistics */
340 struct _keystat {
341 u_long getspi_count; /* the avarage of count to try to get new SPI */
342 } keystat;
343
344 struct sadb_msghdr {
345 struct sadb_msg *msg;
346 struct sadb_ext *ext[SADB_EXT_MAX + 1];
347 int extoff[SADB_EXT_MAX + 1];
348 int extlen[SADB_EXT_MAX + 1];
349 };
350
351 static struct secasvar *key_allocsa_policy (const struct secasindex *);
352 static void key_freesp_so (struct secpolicy **);
353 static struct secasvar *key_do_allocsa_policy (struct secashead *, u_int);
354 static void key_delsp (struct secpolicy *);
355 static struct secpolicy *key_getsp (struct secpolicyindex *);
356 static struct secpolicy *key_getspbyid (u_int32_t);
357 static u_int32_t key_newreqid (void);
358 static struct mbuf *key_gather_mbuf (struct mbuf *,
359 const struct sadb_msghdr *, int, int, ...);
360 static int key_spdadd (struct socket *, struct mbuf *,
361 const struct sadb_msghdr *);
362 static u_int32_t key_getnewspid (void);
363 static int key_spddelete (struct socket *, struct mbuf *,
364 const struct sadb_msghdr *);
365 static int key_spddelete2 (struct socket *, struct mbuf *,
366 const struct sadb_msghdr *);
367 static int key_spdget (struct socket *, struct mbuf *,
368 const struct sadb_msghdr *);
369 static int key_spdflush (struct socket *, struct mbuf *,
370 const struct sadb_msghdr *);
371 static int key_spddump (struct socket *, struct mbuf *,
372 const struct sadb_msghdr *);
373 static struct mbuf *key_setdumpsp (struct secpolicy *,
374 u_int8_t, u_int32_t, u_int32_t);
375 static u_int key_getspreqmsglen (struct secpolicy *);
376 static int key_spdexpire (struct secpolicy *);
377 static struct secashead *key_newsah (struct secasindex *);
378 static void key_delsah (struct secashead *);
379 static struct secasvar *key_newsav (struct mbuf *,
380 const struct sadb_msghdr *, struct secashead *, int *,
381 const char*, int);
382 #define KEY_NEWSAV(m, sadb, sah, e) \
383 key_newsav(m, sadb, sah, e, __FILE__, __LINE__)
384 static void key_delsav (struct secasvar *);
385 static struct secashead *key_getsah (struct secasindex *);
386 static struct secasvar *key_checkspidup (struct secasindex *, u_int32_t);
387 static struct secasvar *key_getsavbyspi (struct secashead *, u_int32_t);
388 static int key_setsaval (struct secasvar *, struct mbuf *,
389 const struct sadb_msghdr *);
390 static int key_mature (struct secasvar *);
391 static struct mbuf *key_setdumpsa (struct secasvar *, u_int8_t,
392 u_int8_t, u_int32_t, u_int32_t);
393 static struct mbuf *key_setsadbmsg (u_int8_t, u_int16_t, u_int8_t,
394 u_int32_t, pid_t, u_int16_t);
395 static struct mbuf *key_setsadbsa (struct secasvar *);
396 static struct mbuf *key_setsadbaddr (u_int16_t,
397 const struct sockaddr *, u_int8_t, u_int16_t);
398 #if 0
399 static struct mbuf *key_setsadbident (u_int16_t, u_int16_t, caddr_t,
400 int, u_int64_t);
401 #endif
402 static struct mbuf *key_setsadbxsa2 (u_int8_t, u_int32_t, u_int32_t);
403 static struct mbuf *key_setsadbxpolicy (u_int16_t, u_int8_t,
404 u_int32_t);
405 static void *key_newbuf (const void *, u_int);
406 #ifdef INET6
407 static int key_ismyaddr6 (struct sockaddr_in6 *);
408 #endif
409
410 /* flags for key_cmpsaidx() */
411 #define CMP_HEAD 1 /* protocol, addresses. */
412 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */
413 #define CMP_REQID 3 /* additionally HEAD, reaid. */
414 #define CMP_EXACTLY 4 /* all elements. */
415 static int key_cmpsaidx
416 (const struct secasindex *, const struct secasindex *, int);
417
418 static int key_cmpspidx_exactly
419 (struct secpolicyindex *, struct secpolicyindex *);
420 static int key_cmpspidx_withmask
421 (struct secpolicyindex *, struct secpolicyindex *);
422 static int key_sockaddrcmp (const struct sockaddr *, const struct sockaddr *, int);
423 static int key_bbcmp (const void *, const void *, u_int);
424 static void key_srandom (void);
425 static u_int16_t key_satype2proto (u_int8_t);
426 static u_int8_t key_proto2satype (u_int16_t);
427
428 static int key_getspi (struct socket *, struct mbuf *,
429 const struct sadb_msghdr *);
430 static u_int32_t key_do_getnewspi (struct sadb_spirange *,
431 struct secasindex *);
432 static int key_update (struct socket *, struct mbuf *,
433 const struct sadb_msghdr *);
434 #ifdef IPSEC_DOSEQCHECK
435 static struct secasvar *key_getsavbyseq (struct secashead *, u_int32_t);
436 #endif
437 static int key_add (struct socket *, struct mbuf *,
438 const struct sadb_msghdr *);
439 static int key_setident (struct secashead *, struct mbuf *,
440 const struct sadb_msghdr *);
441 static struct mbuf *key_getmsgbuf_x1 (struct mbuf *,
442 const struct sadb_msghdr *);
443 static int key_delete (struct socket *, struct mbuf *,
444 const struct sadb_msghdr *);
445 static int key_get (struct socket *, struct mbuf *,
446 const struct sadb_msghdr *);
447
448 static void key_getcomb_setlifetime (struct sadb_comb *);
449 static struct mbuf *key_getcomb_esp (void);
450 static struct mbuf *key_getcomb_ah (void);
451 static struct mbuf *key_getcomb_ipcomp (void);
452 static struct mbuf *key_getprop (const struct secasindex *);
453
454 static int key_acquire (const struct secasindex *, struct secpolicy *);
455 #ifndef IPSEC_NONBLOCK_ACQUIRE
456 static struct secacq *key_newacq (const struct secasindex *);
457 static struct secacq *key_getacq (const struct secasindex *);
458 static struct secacq *key_getacqbyseq (u_int32_t);
459 #endif
460 static struct secspacq *key_newspacq (struct secpolicyindex *);
461 static struct secspacq *key_getspacq (struct secpolicyindex *);
462 static int key_acquire2 (struct socket *, struct mbuf *,
463 const struct sadb_msghdr *);
464 static int key_register (struct socket *, struct mbuf *,
465 const struct sadb_msghdr *);
466 static int key_expire (struct secasvar *);
467 static int key_flush (struct socket *, struct mbuf *,
468 const struct sadb_msghdr *);
469 static int key_dump (struct socket *, struct mbuf *,
470 const struct sadb_msghdr *);
471 static int key_promisc (struct socket *, struct mbuf *,
472 const struct sadb_msghdr *);
473 static int key_senderror (struct socket *, struct mbuf *, int);
474 static int key_validate_ext (const struct sadb_ext *, int);
475 static int key_align (struct mbuf *, struct sadb_msghdr *);
476 #if 0
477 static const char *key_getfqdn (void);
478 static const char *key_getuserfqdn (void);
479 #endif
480 static void key_sa_chgstate (struct secasvar *, u_int8_t);
481 static struct mbuf *key_alloc_mbuf (int);
482
483 #define SA_ADDREF(p) do { \
484 (p)->refcnt++; \
485 KASSERT((p)->refcnt != 0, \
486 ("SA refcnt overflow at %s:%u", __FILE__, __LINE__)); \
487 } while (0)
488 #define SA_DELREF(p) do { \
489 KASSERT((p)->refcnt > 0, \
490 ("SA refcnt underflow at %s:%u", __FILE__, __LINE__)); \
491 (p)->refcnt--; \
492 } while (0)
493
494 #define SP_ADDREF(p) do { \
495 (p)->refcnt++; \
496 KASSERT((p)->refcnt != 0, \
497 ("SP refcnt overflow at %s:%u", __FILE__, __LINE__)); \
498 } while (0)
499 #define SP_DELREF(p) do { \
500 KASSERT((p)->refcnt > 0, \
501 ("SP refcnt underflow at %s:%u", __FILE__, __LINE__)); \
502 (p)->refcnt--; \
503 } while (0)
504
505 /*
506 * Return 0 when there are known to be no SP's for the specified
507 * direction. Otherwise return 1. This is used by IPsec code
508 * to optimize performance.
509 */
510 int
511 key_havesp(u_int dir)
512 {
513 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ?
514 LIST_FIRST(&sptree[dir]) != NULL : 1);
515 }
516
517 /* %%% IPsec policy management */
518 /*
519 * allocating a SP for OUTBOUND or INBOUND packet.
520 * Must call key_freesp() later.
521 * OUT: NULL: not found
522 * others: found and return the pointer.
523 */
524 struct secpolicy *
525 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag)
526 {
527 struct secpolicy *sp;
528
529
530 KASSERT(spidx != NULL, ("key_allocsp: null spidx"));
531 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
532 ("key_allocsp: invalid direction %u", dir));
533
534 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
535 kprintf("DP key_allocsp from %s:%u\n", where, tag));
536
537 /* get a SP entry */
538 crit_enter();
539 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
540 kprintf("*** objects\n"); kdebug_secpolicyindex(spidx));
541
542 LIST_FOREACH(sp, &sptree[dir], chain) {
543 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
544 kprintf("*** in SPD\n");
545 kdebug_secpolicyindex(&sp->spidx));
546
547 if (sp->state == IPSEC_SPSTATE_DEAD)
548 continue;
549 if (key_cmpspidx_withmask(&sp->spidx, spidx))
550 goto found;
551 }
552 sp = NULL;
553 found:
554 if (sp) {
555 /* sanity check */
556 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp");
557
558 /* found a SPD entry */
559 sp->lastused = time_second;
560 SP_ADDREF(sp);
561 }
562 crit_exit();
563
564 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
565 kprintf("DP key_allocsp return SP:%p (ID=%u) refcnt %u\n",
566 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
567 return sp;
568 }
569
570 /*
571 * allocating a SP for OUTBOUND or INBOUND packet.
572 * Must call key_freesp() later.
573 * OUT: NULL: not found
574 * others: found and return the pointer.
575 */
576 struct secpolicy *
577 key_allocsp2(u_int32_t spi,
578 union sockaddr_union *dst,
579 u_int8_t proto,
580 u_int dir,
581 const char* where, int tag)
582 {
583 struct secpolicy *sp;
584
585
586 KASSERT(dst != NULL, ("key_allocsp2: null dst"));
587 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
588 ("key_allocsp2: invalid direction %u", dir));
589
590 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
591 kprintf("DP key_allocsp2 from %s:%u\n", where, tag));
592
593 /* get a SP entry */
594 crit_enter();
595 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
596 kprintf("*** objects\n");
597 kprintf("spi %u proto %u dir %u\n", spi, proto, dir);
598 kdebug_sockaddr(&dst->sa));
599
600 LIST_FOREACH(sp, &sptree[dir], chain) {
601 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
602 kprintf("*** in SPD\n");
603 kdebug_secpolicyindex(&sp->spidx));
604
605 if (sp->state == IPSEC_SPSTATE_DEAD)
606 continue;
607 /* compare simple values, then dst address */
608 if (sp->spidx.ul_proto != proto)
609 continue;
610 /* NB: spi's must exist and match */
611 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi)
612 continue;
613 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0)
614 goto found;
615 }
616 sp = NULL;
617 found:
618 if (sp) {
619 /* sanity check */
620 KEY_CHKSPDIR(sp->spidx.dir, dir, "key_allocsp2");
621
622 /* found a SPD entry */
623 sp->lastused = time_second;
624 SP_ADDREF(sp);
625 }
626 crit_exit();
627
628 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
629 kprintf("DP key_allocsp2 return SP:%p (ID=%u) refcnt %u\n",
630 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
631 return sp;
632 }
633
634 /*
635 * return a policy that matches this particular inbound packet.
636 * XXX slow
637 */
638 struct secpolicy *
639 key_gettunnel(const struct sockaddr *osrc,
640 const struct sockaddr *odst,
641 const struct sockaddr *isrc,
642 const struct sockaddr *idst,
643 const char* where, int tag)
644 {
645 struct secpolicy *sp;
646 const int dir = IPSEC_DIR_INBOUND;
647
648 struct ipsecrequest *r1, *r2, *p;
649 struct secpolicyindex spidx;
650
651 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
652 kprintf("DP key_gettunnel from %s:%u\n", where, tag));
653
654 if (isrc->sa_family != idst->sa_family) {
655 ipseclog((LOG_ERR, "protocol family mismatched %d != %d\n.",
656 isrc->sa_family, idst->sa_family));
657 sp = NULL;
658 goto done;
659 }
660
661 crit_enter();
662 LIST_FOREACH(sp, &sptree[dir], chain) {
663 if (sp->state == IPSEC_SPSTATE_DEAD)
664 continue;
665
666 r1 = r2 = NULL;
667 for (p = sp->req; p; p = p->next) {
668 if (p->saidx.mode != IPSEC_MODE_TUNNEL)
669 continue;
670
671 r1 = r2;
672 r2 = p;
673
674 if (!r1) {
675 /* here we look at address matches only */
676 spidx = sp->spidx;
677 if (isrc->sa_len > sizeof(spidx.src) ||
678 idst->sa_len > sizeof(spidx.dst))
679 continue;
680 bcopy(isrc, &spidx.src, isrc->sa_len);
681 bcopy(idst, &spidx.dst, idst->sa_len);
682 if (!key_cmpspidx_withmask(&sp->spidx, &spidx))
683 continue;
684 } else {
685 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) ||
686 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0))
687 continue;
688 }
689
690 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) ||
691 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0))
692 continue;
693
694 goto found;
695 }
696 }
697 sp = NULL;
698 found:
699 if (sp) {
700 sp->lastused = time_second;
701 SP_ADDREF(sp);
702 }
703 crit_exit();
704 done:
705 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
706 kprintf("DP key_gettunnel return SP:%p (ID=%u) refcnt %u\n",
707 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0));
708 return sp;
709 }
710
711 /*
712 * allocating an SA entry for an *OUTBOUND* packet.
713 * checking each request entries in SP, and acquire an SA if need.
714 * OUT: 0: there are valid requests.
715 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring.
716 */
717 int
718 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx)
719 {
720 u_int level;
721 int error;
722
723 KASSERT(isr != NULL, ("key_checkrequest: null isr"));
724 KASSERT(saidx != NULL, ("key_checkrequest: null saidx"));
725 KASSERT(saidx->mode == IPSEC_MODE_TRANSPORT ||
726 saidx->mode == IPSEC_MODE_TUNNEL,
727 ("key_checkrequest: unexpected policy %u", saidx->mode));
728
729 /* get current level */
730 level = ipsec_get_reqlevel(isr);
731
732 /*
733 * XXX guard against protocol callbacks from the crypto
734 * thread as they reference ipsecrequest.sav which we
735 * temporarily null out below. Need to rethink how we
736 * handle bundled SA's in the callback thread.
737 */
738 #if 0
739 /*
740 * We do allocate new SA only if the state of SA in the holder is
741 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest.
742 */
743 if (isr->sav != NULL) {
744 if (isr->sav->sah == NULL)
745 panic("key_checkrequest: sah is null.");
746 if (isr->sav == (struct secasvar *)LIST_FIRST(
747 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) {
748 KEY_FREESAV(&isr->sav);
749 isr->sav = NULL;
750 }
751 }
752 #else
753 /*
754 * we free any SA stashed in the IPsec request because a different
755 * SA may be involved each time this request is checked, either
756 * because new SAs are being configured, or this request is
757 * associated with an unconnected datagram socket, or this request
758 * is associated with a system default policy.
759 *
760 * The operation may have negative impact to performance. We may
761 * want to check cached SA carefully, rather than picking new SA
762 * every time.
763 */
764 if (isr->sav != NULL) {
765 KEY_FREESAV(&isr->sav);
766 isr->sav = NULL;
767 }
768 #endif
769
770 /*
771 * new SA allocation if no SA found.
772 * key_allocsa_policy should allocate the oldest SA available.
773 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt.
774 */
775 if (isr->sav == NULL)
776 isr->sav = key_allocsa_policy(saidx);
777
778 /* When there is SA. */
779 if (isr->sav != NULL) {
780 if (isr->sav->state != SADB_SASTATE_MATURE &&
781 isr->sav->state != SADB_SASTATE_DYING)
782 return EINVAL;
783 return 0;
784 }
785
786 /* there is no SA */
787 error = key_acquire(saidx, isr->sp);
788 if (error != 0) {
789 /* XXX What should I do ? */
790 ipseclog((LOG_DEBUG, "key_checkrequest: error %d returned "
791 "from key_acquire.\n", error));
792 return error;
793 }
794
795 if (level != IPSEC_LEVEL_REQUIRE) {
796 /* XXX sigh, the interface to this routine is botched */
797 KASSERT(isr->sav == NULL, ("key_checkrequest: unexpected SA"));
798 return 0;
799 } else {
800 return ENOENT;
801 }
802 }
803
804 /*
805 * allocating a SA for policy entry from SAD.
806 * NOTE: searching SAD of aliving state.
807 * OUT: NULL: not found.
808 * others: found and return the pointer.
809 */
810 static struct secasvar *
811 key_allocsa_policy(const struct secasindex *saidx)
812 {
813 struct secashead *sah;
814 struct secasvar *sav;
815 u_int stateidx, state;
816
817 LIST_FOREACH(sah, &sahtree, chain) {
818 if (sah->state == SADB_SASTATE_DEAD)
819 continue;
820 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID))
821 goto found;
822 }
823
824 return NULL;
825
826 found:
827
828 /* search valid state */
829 for (stateidx = 0;
830 stateidx < NELEM(saorder_state_valid);
831 stateidx++) {
832
833 state = saorder_state_valid[stateidx];
834
835 sav = key_do_allocsa_policy(sah, state);
836 if (sav != NULL)
837 return sav;
838 }
839
840 return NULL;
841 }
842
843 /*
844 * searching SAD with direction, protocol, mode and state.
845 * called by key_allocsa_policy().
846 * OUT:
847 * NULL : not found
848 * others : found, pointer to a SA.
849 */
850 static struct secasvar *
851 key_do_allocsa_policy(struct secashead *sah, u_int state)
852 {
853 struct secasvar *sav, *nextsav, *candidate = NULL, *d;
854
855 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain, nextsav) {
856 /* sanity check */
857 KEY_CHKSASTATE(sav->state, state, "key_do_allocsa_policy");
858
859 /* initialize */
860 if (candidate == NULL) {
861 candidate = sav;
862 continue;
863 }
864
865 /* Which SA is the better ? */
866
867 /* sanity check 2 */
868 if (candidate->lft_c == NULL || sav->lft_c == NULL)
869 panic("key_do_allocsa_policy: "
870 "lifetime_current is NULL.\n");
871
872 /* What the best method is to compare ? */
873 if (key_prefered_oldsa) {
874 if (candidate->lft_c->sadb_lifetime_addtime >
875 sav->lft_c->sadb_lifetime_addtime) {
876 candidate = sav;
877 }
878 continue;
879 }
880
881 /* prefered new sa rather than old sa */
882 if (candidate->lft_c->sadb_lifetime_addtime <
883 sav->lft_c->sadb_lifetime_addtime) {
884 d = candidate;
885 candidate = sav;
886 } else
887 d = sav;
888
889 /*
890 * prepared to delete the SA when there is more
891 * suitable candidate and the lifetime of the SA is not
892 * permanent.
893 */
894 if (d->lft_c->sadb_lifetime_addtime != 0) {
895 struct mbuf *m, *result;
896 u_int8_t satype;
897
898 key_sa_chgstate(d, SADB_SASTATE_DEAD);
899
900 KASSERT(d->refcnt > 0,
901 ("key_do_allocsa_policy: bogus ref count"));
902
903 satype = key_proto2satype(d->sah->saidx.proto);
904 if (satype == 0)
905 goto msgfail;
906
907 m = key_setsadbmsg(SADB_DELETE, 0, satype, 0, 0,
908 d->refcnt - 1);
909 if (!m)
910 goto msgfail;
911 result = m;
912
913 /* set sadb_address for saidx's. */
914 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
915 &d->sah->saidx.src.sa,
916 d->sah->saidx.src.sa.sa_len << 3,
917 IPSEC_ULPROTO_ANY);
918 if (!m)
919 goto msgfail;
920 m_cat(result, m);
921
922 /* set sadb_address for saidx's. */
923 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
924 &d->sah->saidx.dst.sa,
925 d->sah->saidx.dst.sa.sa_len << 3,
926 IPSEC_ULPROTO_ANY);
927 if (!m)
928 goto msgfail;
929 m_cat(result, m);
930
931 /* create SA extension */
932 m = key_setsadbsa(d);
933 if (!m)
934 goto msgfail;
935 m_cat(result, m);
936
937 if (result->m_len < sizeof(struct sadb_msg)) {
938 result = m_pullup(result,
939 sizeof(struct sadb_msg));
940 if (result == NULL)
941 goto msgfail;
942 }
943
944 result->m_pkthdr.len = m_lengthm(result, NULL);
945 mtod(result, struct sadb_msg *)->sadb_msg_len =
946 PFKEY_UNIT64(result->m_pkthdr.len);
947
948 if (key_sendup_mbuf(NULL, result,
949 KEY_SENDUP_REGISTERED))
950 goto msgfail;
951 msgfail:
952 KEY_FREESAV(&d);
953 }
954 }
955
956 if (candidate) {
957 SA_ADDREF(candidate);
958 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
959 kprintf("DP allocsa_policy cause refcnt++:%d SA:%p\n",
960 candidate->refcnt, candidate));
961 }
962 return candidate;
963 }
964
965 /*
966 * allocating a usable SA entry for a *INBOUND* packet.
967 * Must call key_freesav() later.
968 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state).
969 * NULL: not found, or error occured.
970 *
971 * In the comparison, no source address is used--for RFC2401 conformance.
972 * To quote, from section 4.1:
973 * A security association is uniquely identified by a triple consisting
974 * of a Security Parameter Index (SPI), an IP Destination Address, and a
975 * security protocol (AH or ESP) identifier.
976 * Note that, however, we do need to keep source address in IPsec SA.
977 * IKE specification and PF_KEY specification do assume that we
978 * keep source address in IPsec SA. We see a tricky situation here.
979 */
980 struct secasvar *
981 key_allocsa(
982 union sockaddr_union *dst,
983 u_int proto,
984 u_int32_t spi,
985 const char* where, int tag)
986 {
987 struct secashead *sah;
988 struct secasvar *sav;
989 u_int stateidx, state;
990
991
992 KASSERT(dst != NULL, ("key_allocsa: null dst address"));
993
994 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
995 kprintf("DP key_allocsa from %s:%u\n", where, tag));
996
997 /*
998 * searching SAD.
999 * XXX: to be checked internal IP header somewhere. Also when
1000 * IPsec tunnel packet is received. But ESP tunnel mode is
1001 * encrypted so we can't check internal IP header.
1002 */
1003 crit_enter();
1004 LIST_FOREACH(sah, &sahtree, chain) {
1005 /* search valid state */
1006 for (stateidx = 0;
1007 stateidx < NELEM(saorder_state_valid);
1008 stateidx++) {
1009 state = saorder_state_valid[stateidx];
1010 LIST_FOREACH(sav, &sah->savtree[state], chain) {
1011 /* sanity check */
1012 KEY_CHKSASTATE(sav->state, state, "key_allocsav");
1013 /* do not return entries w/ unusable state */
1014 if (sav->state != SADB_SASTATE_MATURE &&
1015 sav->state != SADB_SASTATE_DYING)
1016 continue;
1017 if (proto != sav->sah->saidx.proto)
1018 continue;
1019 if (spi != sav->spi)
1020 continue;
1021 #if 0 /* don't check src */
1022 /* check src address */
1023 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0)
1024 continue;
1025 #endif
1026 /* check dst address */
1027 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0)
1028 continue;
1029 SA_ADDREF(sav);
1030 goto done;
1031 }
1032 }
1033 }
1034 sav = NULL;
1035 done:
1036 crit_exit();
1037
1038 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1039 kprintf("DP key_allocsa return SA:%p; refcnt %u\n",
1040 sav, sav ? sav->refcnt : 0));
1041 return sav;
1042 }
1043
1044 /*
1045 * Must be called after calling key_allocsp().
1046 * For both the packet without socket and key_freeso().
1047 */
1048 void
1049 _key_freesp(struct secpolicy **spp, const char* where, int tag)
1050 {
1051 struct secpolicy *sp = *spp;
1052
1053 KASSERT(sp != NULL, ("key_freesp: null sp"));
1054
1055 SP_DELREF(sp);
1056
1057 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1058 kprintf("DP key_freesp SP:%p (ID=%u) from %s:%u; refcnt now %u\n",
1059 sp, sp->id, where, tag, sp->refcnt));
1060
1061 if (sp->refcnt == 0) {
1062 *spp = NULL;
1063 key_delsp(sp);
1064 }
1065 }
1066
1067 /*
1068 * Must be called after calling key_allocsp().
1069 * For the packet with socket.
1070 */
1071 void
1072 key_freeso(struct socket *so)
1073 {
1074 /* sanity check */
1075 KASSERT(so != NULL, ("key_freeso: null so"));
1076
1077 switch (so->so_proto->pr_domain->dom_family) {
1078 #ifdef INET
1079 case PF_INET:
1080 {
1081 struct inpcb *pcb = so->so_pcb;
1082
1083 /* Does it have a PCB ? */
1084 if (pcb == NULL)
1085 return;
1086 key_freesp_so(&pcb->inp_sp->sp_in);
1087 key_freesp_so(&pcb->inp_sp->sp_out);
1088 }
1089 break;
1090 #endif
1091 #ifdef INET6
1092 case PF_INET6:
1093 {
1094 #ifdef HAVE_NRL_INPCB
1095 struct inpcb *pcb = so->so_pcb;
1096
1097 /* Does it have a PCB ? */
1098 if (pcb == NULL)
1099 return;
1100 key_freesp_so(&pcb->inp_sp->sp_in);
1101 key_freesp_so(&pcb->inp_sp->sp_out);
1102 #else
1103 struct in6pcb *pcb = so->so_pcb;
1104
1105 /* Does it have a PCB ? */
1106 if (pcb == NULL)
1107 return;
1108 key_freesp_so(&pcb->in6p_sp->sp_in);
1109 key_freesp_so(&pcb->in6p_sp->sp_out);
1110 #endif
1111 }
1112 break;
1113 #endif /* INET6 */
1114 default:
1115 ipseclog((LOG_DEBUG, "key_freeso: unknown address family=%d.\n",
1116 so->so_proto->pr_domain->dom_family));
1117 return;
1118 }
1119 }
1120
1121 static void
1122 key_freesp_so(struct secpolicy **sp)
1123 {
1124 KASSERT(sp != NULL && *sp != NULL, ("key_freesp_so: null sp"));
1125
1126 if ((*sp)->policy == IPSEC_POLICY_ENTRUST ||
1127 (*sp)->policy == IPSEC_POLICY_BYPASS)
1128 return;
1129
1130 KASSERT((*sp)->policy == IPSEC_POLICY_IPSEC,
1131 ("key_freesp_so: invalid policy %u", (*sp)->policy));
1132 KEY_FREESP(sp);
1133 }
1134
1135 /*
1136 * Must be called after calling key_allocsa().
1137 * This function is called by key_freesp() to free some SA allocated
1138 * for a policy.
1139 */
1140 void
1141 key_freesav(struct secasvar **psav, const char* where, int tag)
1142 {
1143 struct secasvar *sav = *psav;
1144
1145 KASSERT(sav != NULL, ("key_freesav: null sav"));
1146
1147 SA_DELREF(sav);
1148
1149 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1150 kprintf("DP key_freesav SA:%p (SPI %u) from %s:%u; refcnt now %u\n",
1151 sav, ntohl(sav->spi), where, tag, sav->refcnt));
1152
1153 if (sav->refcnt == 0) {
1154 *psav = NULL;
1155 key_delsav(sav);
1156 }
1157 }
1158
1159 /* %%% SPD management */
1160 /*
1161 * free security policy entry.
1162 */
1163 static void
1164 key_delsp(struct secpolicy *sp)
1165 {
1166
1167
1168 KASSERT(sp != NULL, ("key_delsp: null sp"));
1169
1170 sp->state = IPSEC_SPSTATE_DEAD;
1171
1172 KASSERT(sp->refcnt == 0,
1173 ("key_delsp: SP with references deleted (refcnt %u)",
1174 sp->refcnt));
1175
1176 crit_enter();
1177 /* remove from SP index */
1178 if (__LIST_CHAINED(sp))
1179 LIST_REMOVE(sp, chain);
1180
1181 {
1182 struct ipsecrequest *isr = sp->req, *nextisr;
1183
1184 while (isr != NULL) {
1185 if (isr->sav != NULL) {
1186 KEY_FREESAV(&isr->sav);
1187 isr->sav = NULL;
1188 }
1189
1190 nextisr = isr->next;
1191 KFREE(isr);
1192 isr = nextisr;
1193 }
1194 }
1195
1196 KFREE(sp);
1197
1198 crit_exit();
1199 }
1200
1201 /*
1202 * search SPD
1203 * OUT: NULL : not found
1204 * others : found, pointer to a SP.
1205 */
1206 static struct secpolicy *
1207 key_getsp(struct secpolicyindex *spidx)
1208 {
1209 struct secpolicy *sp;
1210
1211 KASSERT(spidx != NULL, ("key_getsp: null spidx"));
1212
1213 LIST_FOREACH(sp, &sptree[spidx->dir], chain) {
1214 if (sp->state == IPSEC_SPSTATE_DEAD)
1215 continue;
1216 if (key_cmpspidx_exactly(spidx, &sp->spidx)) {
1217 SP_ADDREF(sp);
1218 return sp;
1219 }
1220 }
1221
1222 return NULL;
1223 }
1224
1225 /*
1226 * get SP by index.
1227 * OUT: NULL : not found
1228 * others : found, pointer to a SP.
1229 */
1230 static struct secpolicy *
1231 key_getspbyid(u_int32_t id)
1232 {
1233 struct secpolicy *sp;
1234
1235 LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) {
1236 if (sp->state == IPSEC_SPSTATE_DEAD)
1237 continue;
1238 if (sp->id == id) {
1239 SP_ADDREF(sp);
1240 return sp;
1241 }
1242 }
1243
1244 LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) {
1245 if (sp->state == IPSEC_SPSTATE_DEAD)
1246 continue;
1247 if (sp->id == id) {
1248 SP_ADDREF(sp);
1249 return sp;
1250 }
1251 }
1252
1253 return NULL;
1254 }
1255
1256 struct secpolicy *
1257 key_newsp(const char* where, int tag)
1258 {
1259 struct secpolicy *newsp = NULL;
1260
1261 newsp = kmalloc(sizeof(struct secpolicy), M_SECA,
1262 M_INTWAIT | M_ZERO | M_NULLOK);
1263 if (newsp) {
1264 newsp->refcnt = 1;
1265 newsp->req = NULL;
1266 }
1267
1268 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
1269 kprintf("DP key_newsp from %s:%u return SP:%p\n",
1270 where, tag, newsp));
1271 return newsp;
1272 }
1273
1274 /*
1275 * create secpolicy structure from sadb_x_policy structure.
1276 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set,
1277 * so must be set properly later.
1278 */
1279 struct secpolicy *
1280 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error)
1281 {
1282 struct secpolicy *newsp;
1283
1284 /* sanity check */
1285 if (xpl0 == NULL)
1286 panic("key_msg2sp: NULL pointer was passed.");
1287 if (len < sizeof(*xpl0))
1288 panic("key_msg2sp: invalid length.");
1289 if (len != PFKEY_EXTLEN(xpl0)) {
1290 ipseclog((LOG_DEBUG, "key_msg2sp: Invalid msg length.\n"));
1291 *error = EINVAL;
1292 return NULL;
1293 }
1294
1295 if ((newsp = KEY_NEWSP()) == NULL) {
1296 *error = ENOBUFS;
1297 return NULL;
1298 }
1299
1300 newsp->spidx.dir = xpl0->sadb_x_policy_dir;
1301 newsp->policy = xpl0->sadb_x_policy_type;
1302
1303 /* check policy */
1304 switch (xpl0->sadb_x_policy_type) {
1305 case IPSEC_POLICY_DISCARD:
1306 case IPSEC_POLICY_NONE:
1307 case IPSEC_POLICY_ENTRUST:
1308 case IPSEC_POLICY_BYPASS:
1309 newsp->req = NULL;
1310 break;
1311
1312 case IPSEC_POLICY_IPSEC:
1313 {
1314 int tlen;
1315 struct sadb_x_ipsecrequest *xisr;
1316 struct ipsecrequest **p_isr = &newsp->req;
1317
1318 /* validity check */
1319 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) {
1320 ipseclog((LOG_DEBUG,
1321 "key_msg2sp: Invalid msg length.\n"));
1322 KEY_FREESP(&newsp);
1323 *error = EINVAL;
1324 return NULL;
1325 }
1326
1327 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0);
1328 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1);
1329
1330 while (tlen > 0) {
1331 /* length check */
1332 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) {
1333 ipseclog((LOG_DEBUG, "key_msg2sp: "
1334 "invalid ipsecrequest length.\n"));
1335 KEY_FREESP(&newsp);
1336 *error = EINVAL;
1337 return NULL;
1338 }
1339
1340 /* allocate request buffer */
1341 KMALLOC(*p_isr, struct ipsecrequest *, sizeof(**p_isr));
1342 if ((*p_isr) == NULL) {
1343 ipseclog((LOG_DEBUG,
1344 "key_msg2sp: No more memory.\n"));
1345 KEY_FREESP(&newsp);
1346 *error = ENOBUFS;
1347 return NULL;
1348 }
1349 bzero(*p_isr, sizeof(**p_isr));
1350
1351 /* set values */
1352 (*p_isr)->next = NULL;
1353
1354 switch (xisr->sadb_x_ipsecrequest_proto) {
1355 case IPPROTO_ESP:
1356 case IPPROTO_AH:
1357 case IPPROTO_IPCOMP:
1358 break;
1359 default:
1360 ipseclog((LOG_DEBUG,
1361 "key_msg2sp: invalid proto type=%u\n",
1362 xisr->sadb_x_ipsecrequest_proto));
1363 KEY_FREESP(&newsp);
1364 *error = EPROTONOSUPPORT;
1365 return NULL;
1366 }
1367 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto;
1368
1369 switch (xisr->sadb_x_ipsecrequest_mode) {
1370 case IPSEC_MODE_TRANSPORT:
1371 case IPSEC_MODE_TUNNEL:
1372 break;
1373 case IPSEC_MODE_ANY:
1374 default:
1375 ipseclog((LOG_DEBUG,
1376 "key_msg2sp: invalid mode=%u\n",
1377 xisr->sadb_x_ipsecrequest_mode));
1378 KEY_FREESP(&newsp);
1379 *error = EINVAL;
1380 return NULL;
1381 }
1382 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode;
1383
1384 switch (xisr->sadb_x_ipsecrequest_level) {
1385 case IPSEC_LEVEL_DEFAULT:
1386 case IPSEC_LEVEL_USE:
1387 case IPSEC_LEVEL_REQUIRE:
1388 break;
1389 case IPSEC_LEVEL_UNIQUE:
1390 /* validity check */
1391 /*
1392 * If range violation of reqid, kernel will
1393 * update it, don't refuse it.
1394 */
1395 if (xisr->sadb_x_ipsecrequest_reqid
1396 > IPSEC_MANUAL_REQID_MAX) {
1397 ipseclog((LOG_DEBUG,
1398 "key_msg2sp: reqid=%d range "
1399 "violation, updated by kernel.\n",
1400 xisr->sadb_x_ipsecrequest_reqid));
1401 xisr->sadb_x_ipsecrequest_reqid = 0;
1402 }
1403
1404 /* allocate new reqid id if reqid is zero. */
1405 if (xisr->sadb_x_ipsecrequest_reqid == 0) {
1406 u_int32_t reqid;
1407 if ((reqid = key_newreqid()) == 0) {
1408 KEY_FREESP(&newsp);
1409 *error = ENOBUFS;
1410 return NULL;
1411 }
1412 (*p_isr)->saidx.reqid = reqid;
1413 xisr->sadb_x_ipsecrequest_reqid = reqid;
1414 } else {
1415 /* set it for manual keying. */
1416 (*p_isr)->saidx.reqid =
1417 xisr->sadb_x_ipsecrequest_reqid;
1418 }
1419 break;
1420
1421 default:
1422 ipseclog((LOG_DEBUG, "key_msg2sp: invalid level=%u\n",
1423 xisr->sadb_x_ipsecrequest_level));
1424 KEY_FREESP(&newsp);
1425 *error = EINVAL;
1426 return NULL;
1427 }
1428 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level;
1429
1430 /* set IP addresses if there */
1431 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
1432 struct sockaddr *paddr;
1433
1434 paddr = (struct sockaddr *)(xisr + 1);
1435
1436 /* validity check */
1437 if (paddr->sa_len
1438 > sizeof((*p_isr)->saidx.src)) {
1439 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
1440 "address length.\n"));
1441 KEY_FREESP(&newsp);
1442 *error = EINVAL;
1443 return NULL;
1444 }
1445 bcopy(paddr, &(*p_isr)->saidx.src,
1446 paddr->sa_len);
1447
1448 paddr = (struct sockaddr *)((caddr_t)paddr
1449 + paddr->sa_len);
1450
1451 /* validity check */
1452 if (paddr->sa_len
1453 > sizeof((*p_isr)->saidx.dst)) {
1454 ipseclog((LOG_DEBUG, "key_msg2sp: invalid request "
1455 "address length.\n"));
1456 KEY_FREESP(&newsp);
1457 *error = EINVAL;
1458 return NULL;
1459 }
1460 bcopy(paddr, &(*p_isr)->saidx.dst,
1461 paddr->sa_len);
1462 }
1463
1464 (*p_isr)->sav = NULL;
1465 (*p_isr)->sp = newsp;
1466
1467 /* initialization for the next. */
1468 p_isr = &(*p_isr)->next;
1469 tlen -= xisr->sadb_x_ipsecrequest_len;
1470
1471 /* validity check */
1472 if (tlen < 0) {
1473 ipseclog((LOG_DEBUG, "key_msg2sp: becoming tlen < 0.\n"));
1474 KEY_FREESP(&newsp);
1475 *error = EINVAL;
1476 return NULL;
1477 }
1478
1479 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr
1480 + xisr->sadb_x_ipsecrequest_len);
1481 }
1482 }
1483 break;
1484 default:
1485 ipseclog((LOG_DEBUG, "key_msg2sp: invalid policy type.\n"));
1486 KEY_FREESP(&newsp);
1487 *error = EINVAL;
1488 return NULL;
1489 }
1490
1491 *error = 0;
1492 return newsp;
1493 }
1494
1495 static u_int32_t
1496 key_newreqid(void)
1497 {
1498 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1;
1499
1500 auto_reqid = (auto_reqid == ~0
1501 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1);
1502
1503 /* XXX should be unique check */
1504
1505 return auto_reqid;
1506 }
1507
1508 /*
1509 * copy secpolicy struct to sadb_x_policy structure indicated.
1510 */
1511 struct mbuf *
1512 key_sp2msg(struct secpolicy *sp)
1513 {
1514 struct sadb_x_policy *xpl;
1515 int tlen;
1516 caddr_t p;
1517 struct mbuf *m;
1518
1519 /* sanity check. */
1520 if (sp == NULL)
1521 panic("key_sp2msg: NULL pointer was passed.");
1522
1523 tlen = key_getspreqmsglen(sp);
1524
1525 m = key_alloc_mbuf(tlen);
1526 if (!m || m->m_next) { /*XXX*/
1527 if (m)
1528 m_freem(m);
1529 return NULL;
1530 }
1531
1532 m->m_len = tlen;
1533 m->m_next = NULL;
1534 xpl = mtod(m, struct sadb_x_policy *);
1535 bzero(xpl, tlen);
1536
1537 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen);
1538 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
1539 xpl->sadb_x_policy_type = sp->policy;
1540 xpl->sadb_x_policy_dir = sp->spidx.dir;
1541 xpl->sadb_x_policy_id = sp->id;
1542 p = (caddr_t)xpl + sizeof(*xpl);
1543
1544 /* if is the policy for ipsec ? */
1545 if (sp->policy == IPSEC_POLICY_IPSEC) {
1546 struct sadb_x_ipsecrequest *xisr;
1547 struct ipsecrequest *isr;
1548
1549 for (isr = sp->req; isr != NULL; isr = isr->next) {
1550
1551 xisr = (struct sadb_x_ipsecrequest *)p;
1552
1553 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto;
1554 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode;
1555 xisr->sadb_x_ipsecrequest_level = isr->level;
1556 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid;
1557
1558 p += sizeof(*xisr);
1559 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len);
1560 p += isr->saidx.src.sa.sa_len;
1561 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len);
1562 p += isr->saidx.src.sa.sa_len;
1563
1564 xisr->sadb_x_ipsecrequest_len =
1565 PFKEY_ALIGN8(sizeof(*xisr)
1566 + isr->saidx.src.sa.sa_len
1567 + isr->saidx.dst.sa.sa_len);
1568 }
1569 }
1570
1571 return m;
1572 }
1573
1574 /* m will not be freed nor modified */
1575 static struct mbuf *
1576 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp,
1577 int ndeep, int nitem, ...)
1578 {
1579 __va_list ap;
1580 int idx;
1581 int i;
1582 struct mbuf *result = NULL, *n;
1583 int len;
1584
1585 if (m == NULL || mhp == NULL)
1586 panic("null pointer passed to key_gather");
1587
1588 __va_start(ap, nitem);
1589 for (i = 0; i < nitem; i++) {
1590 idx = __va_arg(ap, int);
1591 if (idx < 0 || idx > SADB_EXT_MAX)
1592 goto fail;
1593 /* don't attempt to pull empty extension */
1594 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL)
1595 continue;
1596 if (idx != SADB_EXT_RESERVED &&
1597 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0))
1598 continue;
1599
1600 if (idx == SADB_EXT_RESERVED) {
1601 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
1602 #ifdef DIAGNOSTIC
1603 if (len > MHLEN)
1604 panic("assumption failed");
1605 #endif
1606 MGETHDR(n, M_NOWAIT, MT_DATA);
1607 if (!n)
1608 goto fail;
1609 n->m_len = len;
1610 n->m_next = NULL;
1611 m_copydata(m, 0, sizeof(struct sadb_msg),
1612 mtod(n, caddr_t));
1613 } else if (i < ndeep) {
1614 len = mhp->extlen[idx];
1615 n = key_alloc_mbuf(len);
1616 if (!n || n->m_next) { /*XXX*/
1617 if (n)
1618 m_freem(n);
1619 goto fail;
1620 }
1621 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx],
1622 mtod(n, caddr_t));
1623 } else {
1624 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx],
1625 M_NOWAIT);
1626 }
1627 if (n == NULL)
1628 goto fail;
1629
1630 if (result)
1631 m_cat(result, n);
1632 else
1633 result = n;
1634 }
1635 __va_end(ap);
1636
1637 if (result->m_flags & M_PKTHDR)
1638 result->m_pkthdr.len = m_lengthm(result, NULL);
1639
1640 return result;
1641
1642 fail:
1643 m_freem(result);
1644 return NULL;
1645 }
1646
1647 /*
1648 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing
1649 * add an entry to SP database, when received
1650 * <base, address(SD), (lifetime(H),) policy>
1651 * from the user(?).
1652 * Adding to SP database,
1653 * and send
1654 * <base, address(SD), (lifetime(H),) policy>
1655 * to the socket which was send.
1656 *
1657 * SPDADD set a unique policy entry.
1658 * SPDSETIDX like SPDADD without a part of policy requests.
1659 * SPDUPDATE replace a unique policy entry.
1660 *
1661 * m will always be freed.
1662 */
1663 static int
1664 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1665 {
1666 struct sadb_address *src0, *dst0;
1667 struct sadb_x_policy *xpl0, *xpl;
1668 struct sadb_lifetime *lft = NULL;
1669 struct secpolicyindex spidx;
1670 struct secpolicy *newsp;
1671 struct sockaddr *saddr, *daddr;
1672 int error;
1673
1674 /* sanity check */
1675 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
1676 panic("key_spdadd: NULL pointer is passed.");
1677
1678 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
1679 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
1680 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
1681 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1682 return key_senderror(so, m, EINVAL);
1683 }
1684 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
1685 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
1686 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
1687 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1688 return key_senderror(so, m, EINVAL);
1689 }
1690 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) {
1691 if (mhp->extlen[SADB_EXT_LIFETIME_HARD]
1692 < sizeof(struct sadb_lifetime)) {
1693 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n"));
1694 return key_senderror(so, m, EINVAL);
1695 }
1696 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
1697 }
1698
1699 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1700 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1701 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1702
1703 /* make secindex */
1704 /* XXX boundary check against sa_len */
1705 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1706 src0 + 1,
1707 dst0 + 1,
1708 src0->sadb_address_prefixlen,
1709 dst0->sadb_address_prefixlen,
1710 src0->sadb_address_proto,
1711 &spidx);
1712
1713 /* checking the direciton. */
1714 switch (xpl0->sadb_x_policy_dir) {
1715 case IPSEC_DIR_INBOUND:
1716 case IPSEC_DIR_OUTBOUND:
1717 break;
1718 default:
1719 ipseclog((LOG_DEBUG, "key_spdadd: Invalid SP direction.\n"));
1720 mhp->msg->sadb_msg_errno = EINVAL;
1721 return 0;
1722 }
1723
1724 /* check policy */
1725 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */
1726 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST
1727 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1728 ipseclog((LOG_DEBUG, "key_spdadd: Invalid policy type.\n"));
1729 return key_senderror(so, m, EINVAL);
1730 }
1731
1732 /* policy requests are mandatory when action is ipsec. */
1733 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX
1734 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC
1735 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) {
1736 ipseclog((LOG_DEBUG, "key_spdadd: some policy requests part required.\n"));
1737 return key_senderror(so, m, EINVAL);
1738 }
1739
1740 /*
1741 * checking there is SP already or not.
1742 * SPDUPDATE doesn't depend on whether there is a SP or not.
1743 * If the type is either SPDADD or SPDSETIDX AND a SP is found,
1744 * then error.
1745 */
1746 newsp = key_getsp(&spidx);
1747 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1748 if (newsp) {
1749 newsp->state = IPSEC_SPSTATE_DEAD;
1750 KEY_FREESP(&newsp);
1751 }
1752 } else {
1753 if (newsp != NULL) {
1754 KEY_FREESP(&newsp);
1755 ipseclog((LOG_DEBUG, "key_spdadd: a SP entry exists already.\n"));
1756 return key_senderror(so, m, EEXIST);
1757 }
1758 }
1759
1760 /* allocation new SP entry */
1761 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) {
1762 return key_senderror(so, m, error);
1763 }
1764
1765 if ((newsp->id = key_getnewspid()) == 0) {
1766 KFREE(newsp);
1767 return key_senderror(so, m, ENOBUFS);
1768 }
1769
1770 /* XXX boundary check against sa_len */
1771 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1772 src0 + 1,
1773 dst0 + 1,
1774 src0->sadb_address_prefixlen,
1775 dst0->sadb_address_prefixlen,
1776 src0->sadb_address_proto,
1777 &newsp->spidx);
1778
1779 /* sanity check on addr pair */
1780 saddr = (struct sockaddr *)(src0 + 1);
1781 daddr = (struct sockaddr *)(dst0 + 1);
1782 if (saddr->sa_family != daddr->sa_family) {
1783 KFREE(newsp);
1784 return key_senderror(so, m, EINVAL);
1785 }
1786 if (saddr->sa_len != daddr->sa_len) {
1787 KFREE(newsp);
1788 return key_senderror(so, m, EINVAL);
1789 }
1790 #if 1
1791 if (newsp->req && newsp->req->saidx.src.sa.sa_family) {
1792 if (saddr->sa_family != newsp->req->saidx.src.sa.sa_family) {
1793 KFREE(newsp);
1794 return key_senderror(so, m, EINVAL);
1795 }
1796 }
1797 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) {
1798 if (daddr->sa_family != newsp->req->saidx.dst.sa.sa_family) {
1799 KFREE(newsp);
1800 return key_senderror(so, m, EINVAL);
1801 }
1802 }
1803 #endif
1804
1805 newsp->created = time_second;
1806 newsp->lastused = newsp->created;
1807 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0;
1808 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0;
1809
1810 newsp->refcnt = 1; /* do not reclaim until I say I do */
1811 newsp->state = IPSEC_SPSTATE_ALIVE;
1812 LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain);
1813
1814 /* delete the entry in spacqtree */
1815 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) {
1816 struct secspacq *spacq;
1817 if ((spacq = key_getspacq(&spidx)) != NULL) {
1818 /* reset counter in order to deletion by timehandler. */
1819 spacq->created = time_second;
1820 spacq->count = 0;
1821 }
1822 }
1823
1824 {
1825 struct mbuf *n, *mpolicy;
1826 struct sadb_msg *newmsg;
1827 int off;
1828
1829 /* create new sadb_msg to reply. */
1830 if (lft) {
1831 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED,
1832 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD,
1833 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1834 } else {
1835 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED,
1836 SADB_X_EXT_POLICY,
1837 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1838 }
1839 if (!n)
1840 return key_senderror(so, m, ENOBUFS);
1841
1842 if (n->m_len < sizeof(*newmsg)) {
1843 n = m_pullup(n, sizeof(*newmsg));
1844 if (!n)
1845 return key_senderror(so, m, ENOBUFS);
1846 }
1847 newmsg = mtod(n, struct sadb_msg *);
1848 newmsg->sadb_msg_errno = 0;
1849 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
1850
1851 off = 0;
1852 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)),
1853 sizeof(*xpl), &off);
1854 if (mpolicy == NULL) {
1855 /* n is already freed */
1856 return key_senderror(so, m, ENOBUFS);
1857 }
1858 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off);
1859 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
1860 m_freem(n);
1861 return key_senderror(so, m, EINVAL);
1862 }
1863 xpl->sadb_x_policy_id = newsp->id;
1864
1865 m_freem(m);
1866 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
1867 }
1868 }
1869
1870 /*
1871 * get new policy id.
1872 * OUT:
1873 * 0: failure.
1874 * others: success.
1875 */
1876 static u_int32_t
1877 key_getnewspid(void)
1878 {
1879 u_int32_t newid = 0;
1880 int count = key_spi_trycnt; /* XXX */
1881 struct secpolicy *sp;
1882
1883 /* when requesting to allocate spi ranged */
1884 while (count--) {
1885 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1));
1886
1887 if ((sp = key_getspbyid(newid)) == NULL)
1888 break;
1889
1890 KEY_FREESP(&sp);
1891 }
1892
1893 if (count == 0 || newid == 0) {
1894 ipseclog((LOG_DEBUG, "key_getnewspid: to allocate policy id is failed.\n"));
1895 return 0;
1896 }
1897
1898 return newid;
1899 }
1900
1901 /*
1902 * SADB_SPDDELETE processing
1903 * receive
1904 * <base, address(SD), policy(*)>
1905 * from the user(?), and set SADB_SASTATE_DEAD,
1906 * and send,
1907 * <base, address(SD), policy(*)>
1908 * to the ikmpd.
1909 * policy(*) including direction of policy.
1910 *
1911 * m will always be freed.
1912 */
1913 static int
1914 key_spddelete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
1915 {
1916 struct sadb_address *src0, *dst0;
1917 struct sadb_x_policy *xpl0;
1918 struct secpolicyindex spidx;
1919 struct secpolicy *sp;
1920
1921 /* sanity check */
1922 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
1923 panic("key_spddelete: NULL pointer is passed.");
1924
1925 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL ||
1926 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL ||
1927 mhp->ext[SADB_X_EXT_POLICY] == NULL) {
1928 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
1929 return key_senderror(so, m, EINVAL);
1930 }
1931 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) ||
1932 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) ||
1933 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
1934 ipseclog((LOG_DEBUG, "key_spddelete: invalid message is passed.\n"));
1935 return key_senderror(so, m, EINVAL);
1936 }
1937
1938 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC];
1939 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST];
1940 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY];
1941
1942 /* make secindex */
1943 /* XXX boundary check against sa_len */
1944 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir,
1945 src0 + 1,
1946 dst0 + 1,
1947 src0->sadb_address_prefixlen,
1948 dst0->sadb_address_prefixlen,
1949 src0->sadb_address_proto,
1950 &spidx);
1951
1952 /* checking the direciton. */
1953 switch (xpl0->sadb_x_policy_dir) {
1954 case IPSEC_DIR_INBOUND:
1955 case IPSEC_DIR_OUTBOUND:
1956 break;
1957 default:
1958 ipseclog((LOG_DEBUG, "key_spddelete: Invalid SP direction.\n"));
1959 return key_senderror(so, m, EINVAL);
1960 }
1961
1962 /* Is there SP in SPD ? */
1963 if ((sp = key_getsp(&spidx)) == NULL) {
1964 ipseclog((LOG_DEBUG, "key_spddelete: no SP found.\n"));
1965 return key_senderror(so, m, EINVAL);
1966 }
1967
1968 /* save policy id to buffer to be returned. */
1969 xpl0->sadb_x_policy_id = sp->id;
1970
1971 sp->state = IPSEC_SPSTATE_DEAD;
1972 KEY_FREESP(&sp);
1973
1974 {
1975 struct mbuf *n;
1976 struct sadb_msg *newmsg;
1977
1978 /* create new sadb_msg to reply. */
1979 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED,
1980 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST);
1981 if (!n)
1982 return key_senderror(so, m, ENOBUFS);
1983
1984 newmsg = mtod(n, struct sadb_msg *);
1985 newmsg->sadb_msg_errno = 0;
1986 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
1987
1988 m_freem(m);
1989 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
1990 }
1991 }
1992
1993 /*
1994 * SADB_SPDDELETE2 processing
1995 * receive
1996 * <base, policy(*)>
1997 * from the user(?), and set SADB_SASTATE_DEAD,
1998 * and send,
1999 * <base, policy(*)>
2000 * to the ikmpd.
2001 * policy(*) including direction of policy.
2002 *
2003 * m will always be freed.
2004 */
2005 static int
2006 key_spddelete2(struct socket *so, struct mbuf *m,
2007 const struct sadb_msghdr *mhp)
2008 {
2009 u_int32_t id;
2010 struct secpolicy *sp;
2011
2012 /* sanity check */
2013 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2014 panic("key_spddelete2: NULL pointer is passed.");
2015
2016 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2017 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2018 ipseclog((LOG_DEBUG, "key_spddelete2: invalid message is passed.\n"));
2019 key_senderror(so, m, EINVAL);
2020 return 0;
2021 }
2022
2023 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2024
2025 /* Is there SP in SPD ? */
2026 if ((sp = key_getspbyid(id)) == NULL) {
2027 ipseclog((LOG_DEBUG, "key_spddelete2: no SP found id:%u.\n", id));
2028 key_senderror(so, m, EINVAL);
2029 }
2030
2031 sp->state = IPSEC_SPSTATE_DEAD;
2032 KEY_FREESP(&sp);
2033
2034 {
2035 struct mbuf *n;
2036 struct sadb_msg *newmsg;
2037 int off, len;
2038
2039 /* create new sadb_msg to reply. */
2040 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2041
2042 if (len > MCLBYTES)
2043 return key_senderror(so, m, ENOBUFS);
2044 n = m_getb(len, M_NOWAIT, MT_DATA, M_PKTHDR);
2045 if (!n)
2046 return key_senderror(so, m, ENOBUFS);
2047 n->m_len = len;
2048
2049 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t));
2050 off = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2051
2052 #ifdef DIAGNOSTIC
2053 if (off != len)
2054 panic("length inconsistency in key_spddelete2");
2055 #endif
2056
2057 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY],
2058 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT);
2059 if (!n->m_next) {
2060 m_freem(n);
2061 return key_senderror(so, m, ENOBUFS);
2062 }
2063 n->m_pkthdr.len = m_lengthm(n, NULL);
2064
2065 newmsg = mtod(n, struct sadb_msg *);
2066 newmsg->sadb_msg_errno = 0;
2067 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len);
2068
2069 m_freem(m);
2070 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL);
2071 }
2072 }
2073
2074 /*
2075 * SADB_X_GET processing
2076 * receive
2077 * <base, policy(*)>
2078 * from the user(?),
2079 * and send,
2080 * <base, address(SD), policy>
2081 * to the ikmpd.
2082 * policy(*) including direction of policy.
2083 *
2084 * m will always be freed.
2085 */
2086 static int
2087 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2088 {
2089 u_int32_t id;
2090 struct secpolicy *sp;
2091 struct mbuf *n;
2092
2093 /* sanity check */
2094 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2095 panic("key_spdget: NULL pointer is passed.");
2096
2097 if (mhp->ext[SADB_X_EXT_POLICY] == NULL ||
2098 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) {
2099 ipseclog((LOG_DEBUG, "key_spdget: invalid message is passed.\n"));
2100 return key_senderror(so, m, EINVAL);
2101 }
2102
2103 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id;
2104
2105 /* Is there SP in SPD ? */
2106 if ((sp = key_getspbyid(id)) == NULL) {
2107 ipseclog((LOG_DEBUG, "key_spdget: no SP found id:%u.\n", id));
2108 return key_senderror(so, m, ENOENT);
2109 }
2110
2111 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid);
2112 if (n != NULL) {
2113 m_freem(m);
2114 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2115 } else
2116 return key_senderror(so, m, ENOBUFS);
2117 }
2118
2119 /*
2120 * SADB_X_SPDACQUIRE processing.
2121 * Acquire policy and SA(s) for a *OUTBOUND* packet.
2122 * send
2123 * <base, policy(*)>
2124 * to KMD, and expect to receive
2125 * <base> with SADB_X_SPDACQUIRE if error occured,
2126 * or
2127 * <base, policy>
2128 * with SADB_X_SPDUPDATE from KMD by PF_KEY.
2129 * policy(*) is without policy requests.
2130 *
2131 * 0 : succeed
2132 * others: error number
2133 */
2134 int
2135 key_spdacquire(struct secpolicy *sp)
2136 {
2137 struct mbuf *result = NULL, *m;
2138 struct secspacq *newspacq;
2139 int error;
2140
2141 /* sanity check */
2142 if (sp == NULL)
2143 panic("key_spdacquire: NULL pointer is passed.");
2144 if (sp->req != NULL)
2145 panic("key_spdacquire: called but there is request.");
2146 if (sp->policy != IPSEC_POLICY_IPSEC)
2147 panic("key_spdacquire: policy mismatched. IPsec is expected.");
2148
2149 /* Get an entry to check whether sent message or not. */
2150 if ((newspacq = key_getspacq(&sp->spidx)) != NULL) {
2151 if (key_blockacq_count < newspacq->count) {
2152 /* reset counter and do send message. */
2153 newspacq->count = 0;
2154 } else {
2155 /* increment counter and do nothing. */
2156 newspacq->count++;
2157 return 0;
2158 }
2159 } else {
2160 /* make new entry for blocking to send SADB_ACQUIRE. */
2161 if ((newspacq = key_newspacq(&sp->spidx)) == NULL)
2162 return ENOBUFS;
2163
2164 /* add to acqtree */
2165 LIST_INSERT_HEAD(&spacqtree, newspacq, chain);
2166 }
2167
2168 /* create new sadb_msg to reply. */
2169 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0);
2170 if (!m) {
2171 error = ENOBUFS;
2172 goto fail;
2173 }
2174 result = m;
2175 result->m_pkthdr.len = m_lengthm(result, NULL);
2176 mtod(result, struct sadb_msg *)->sadb_msg_len =
2177 PFKEY_UNIT64(result->m_pkthdr.len);
2178
2179 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED);
2180
2181 fail:
2182 if (result)
2183 m_freem(result);
2184 return error;
2185 }
2186
2187 /*
2188 * SADB_SPDFLUSH processing
2189 * receive
2190 * <base>
2191 * from the user, and free all entries in secpctree.
2192 * and send,
2193 * <base>
2194 * to the user.
2195 * NOTE: what to do is only marking SADB_SASTATE_DEAD.
2196 *
2197 * m will always be freed.
2198 */
2199 static int
2200 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2201 {
2202 struct sadb_msg *newmsg;
2203 struct secpolicy *sp;
2204 u_int dir;
2205
2206 /* sanity check */
2207 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2208 panic("key_spdflush: NULL pointer is passed.");
2209
2210 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg)))
2211 return key_senderror(so, m, EINVAL);
2212
2213 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2214 LIST_FOREACH(sp, &sptree[dir], chain) {
2215 sp->state = IPSEC_SPSTATE_DEAD;
2216 }
2217 }
2218
2219 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) {
2220 ipseclog((LOG_DEBUG, "key_spdflush: No more memory.\n"));
2221 return key_senderror(so, m, ENOBUFS);
2222 }
2223
2224 if (m->m_next)
2225 m_freem(m->m_next);
2226 m->m_next = NULL;
2227 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
2228 newmsg = mtod(m, struct sadb_msg *);
2229 newmsg->sadb_msg_errno = 0;
2230 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len);
2231
2232 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
2233 }
2234
2235 /*
2236 * SADB_SPDDUMP processing
2237 * receive
2238 * <base>
2239 * from the user, and dump all SP leaves
2240 * and send,
2241 * <base> .....
2242 * to the ikmpd.
2243 *
2244 * m will always be freed.
2245 */
2246 static int
2247 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
2248 {
2249 struct secpolicy *sp;
2250 int cnt;
2251 u_int dir;
2252 struct mbuf *n;
2253
2254 /* sanity check */
2255 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
2256 panic("key_spddump: NULL pointer is passed.");
2257
2258 /* search SPD entry and get buffer size. */
2259 cnt = 0;
2260 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2261 LIST_FOREACH(sp, &sptree[dir], chain) {
2262 cnt++;
2263 }
2264 }
2265
2266 if (cnt == 0)
2267 return key_senderror(so, m, ENOENT);
2268
2269 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) {
2270 LIST_FOREACH(sp, &sptree[dir], chain) {
2271 --cnt;
2272 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt,
2273 mhp->msg->sadb_msg_pid);
2274
2275 if (n)
2276 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
2277 }
2278 }
2279
2280 m_freem(m);
2281 return 0;
2282 }
2283
2284 static struct mbuf *
2285 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq,
2286 u_int32_t pid)
2287 {
2288 struct mbuf *result = NULL, *m;
2289
2290 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt);
2291 if (!m)
2292 goto fail;
2293 result = m;
2294
2295 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2296 &sp->spidx.src.sa, sp->spidx.prefs,
2297 sp->spidx.ul_proto);
2298 if (!m)
2299 goto fail;
2300 m_cat(result, m);
2301
2302 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2303 &sp->spidx.dst.sa, sp->spidx.prefd,
2304 sp->spidx.ul_proto);
2305 if (!m)
2306 goto fail;
2307 m_cat(result, m);
2308
2309 m = key_sp2msg(sp);
2310 if (!m)
2311 goto fail;
2312 m_cat(result, m);
2313
2314 if ((result->m_flags & M_PKTHDR) == 0)
2315 goto fail;
2316
2317 if (result->m_len < sizeof(struct sadb_msg)) {
2318 result = m_pullup(result, sizeof(struct sadb_msg));
2319 if (result == NULL)
2320 goto fail;
2321 }
2322 result->m_pkthdr.len = m_lengthm(result, NULL);
2323 mtod(result, struct sadb_msg *)->sadb_msg_len =
2324 PFKEY_UNIT64(result->m_pkthdr.len);
2325
2326 return result;
2327
2328 fail:
2329 m_freem(result);
2330 return NULL;
2331 }
2332
2333 /*
2334 * get PFKEY message length for security policy and request.
2335 */
2336 static u_int
2337 key_getspreqmsglen(struct secpolicy *sp)
2338 {
2339 struct ipsecrequest *isr;
2340 u_int tlen, len;
2341
2342 tlen = sizeof(struct sadb_x_policy);
2343
2344 /* if is the policy for ipsec ? */
2345 if (sp->policy != IPSEC_POLICY_IPSEC)
2346 return tlen;
2347
2348 /* get length of ipsec requests */
2349 for (isr = sp->req; isr != NULL; isr = isr->next) {
2350 len = sizeof(struct sadb_x_ipsecrequest) +
2351 isr->saidx.src.sa.sa_len + isr->saidx.dst.sa.sa_len;
2352
2353 tlen += PFKEY_ALIGN8(len);
2354 }
2355
2356 return tlen;
2357 }
2358
2359 /*
2360 * SADB_SPDEXPIRE processing
2361 * send
2362 * <base, address(SD), lifetime(CH), policy>
2363 * to KMD by PF_KEY.
2364 *
2365 * OUT: 0 : succeed
2366 * others : error number
2367 */
2368 static int
2369 key_spdexpire(struct secpolicy *sp)
2370 {
2371
2372 struct mbuf *result = NULL, *m;
2373 int len;
2374 int error = -1;
2375 struct sadb_lifetime *lt;
2376
2377 /* XXX: Why do we lock ? */
2378 crit_enter();
2379
2380 /* sanity check */
2381 if (sp == NULL)
2382 panic("key_spdexpire: NULL pointer is passed.");
2383
2384 /* set msg header */
2385 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0);
2386 if (!m) {
2387 error = ENOBUFS;
2388 goto fail;
2389 }
2390 result = m;
2391
2392 /* create lifetime extension (current and hard) */
2393 len = PFKEY_ALIGN8(sizeof(*lt)) * 2;
2394 m = key_alloc_mbuf(len);
2395 if (!m || m->m_next) { /*XXX*/
2396 if (m)
2397 m_freem(m);
2398 error = ENOBUFS;
2399 goto fail;
2400 }
2401 bzero(mtod(m, caddr_t), len);
2402 lt = mtod(m, struct sadb_lifetime *);
2403 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2404 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2405 lt->sadb_lifetime_allocations = 0;
2406 lt->sadb_lifetime_bytes = 0;
2407 lt->sadb_lifetime_addtime = sp->created;
2408 lt->sadb_lifetime_usetime = sp->lastused;
2409 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2);
2410 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2411 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD;
2412 lt->sadb_lifetime_allocations = 0;
2413 lt->sadb_lifetime_bytes = 0;
2414 lt->sadb_lifetime_addtime = sp->lifetime;
2415 lt->sadb_lifetime_usetime = sp->validtime;
2416 m_cat(result, m);
2417
2418 /* set sadb_address for source */
2419 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
2420 &sp->spidx.src.sa,
2421 sp->spidx.prefs, sp->spidx.ul_proto);
2422 if (!m) {
2423 error = ENOBUFS;
2424 goto fail;
2425 }
2426 m_cat(result, m);
2427
2428 /* set sadb_address for destination */
2429 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
2430 &sp->spidx.dst.sa,
2431 sp->spidx.prefd, sp->spidx.ul_proto);
2432 if (!m) {
2433 error = ENOBUFS;
2434 goto fail;
2435 }
2436 m_cat(result, m);
2437
2438 /* set secpolicy */
2439 m = key_sp2msg(sp);
2440 if (!m) {
2441 error = ENOBUFS;
2442 goto fail;
2443 }
2444 m_cat(result, m);
2445
2446 if ((result->m_flags & M_PKTHDR) == 0) {
2447 error = EINVAL;
2448 goto fail;
2449 }
2450
2451 if (result->m_len < sizeof(struct sadb_msg)) {
2452 result = m_pullup(result, sizeof(struct sadb_msg));
2453 if (result == NULL) {
2454 error = ENOBUFS;
2455 goto fail;
2456 }
2457 }
2458 result->m_pkthdr.len = m_lengthm(result, NULL);
2459 mtod(result, struct sadb_msg *)->sadb_msg_len =
2460 PFKEY_UNIT64(result->m_pkthdr.len);
2461
2462 error = key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED);
2463 crit_exit();
2464 return error;
2465
2466 fail:
2467 if (result)
2468 m_freem(result);
2469 crit_exit();
2470 return error;
2471 }
2472
2473 /* %%% SAD management */
2474 /*
2475 * allocating a memory for new SA head, and copy from the values of mhp.
2476 * OUT: NULL : failure due to the lack of memory.
2477 * others : pointer to new SA head.
2478 */
2479 static struct secashead *
2480 key_newsah(struct secasindex *saidx)
2481 {
2482 struct secashead *newsah;
2483
2484 KASSERT(saidx != NULL, ("key_newsaidx: null saidx"));
2485
2486 newsah = kmalloc(sizeof(struct secashead), M_SECA,
2487 M_INTWAIT | M_ZERO | M_NULLOK);
2488 if (newsah != NULL) {
2489 int i;
2490 for (i = 0; i < NELEM(newsah->savtree); i++)
2491 LIST_INIT(&newsah->savtree[i]);
2492 newsah->saidx = *saidx;
2493
2494 /* add to saidxtree */
2495 newsah->state = SADB_SASTATE_MATURE;
2496 LIST_INSERT_HEAD(&sahtree, newsah, chain);
2497 }
2498 return(newsah);
2499 }
2500
2501 /*
2502 * Delete SA index and all registered SAs.
2503 */
2504 static void
2505 key_delsah(struct secashead *sah)
2506 {
2507 struct secasvar *sav, *nextsav;
2508 u_int stateidx;
2509 int nzombies = 0;
2510
2511 /* sanity check */
2512 if (sah == NULL)
2513 panic("key_delsah: NULL pointer is passed.");
2514
2515 crit_enter();
2516
2517 /* searching all SA registerd in the secindex. */
2518 for (stateidx = 0; stateidx < NELEM(saorder_state_any);
2519 stateidx++) {
2520 u_int state = saorder_state_any[stateidx];
2521
2522 LIST_FOREACH_MUTABLE(sav, &sah->savtree[state], chain, nextsav)
2523 if (sav->refcnt == 0) {
2524 /* sanity check */
2525 KEY_CHKSASTATE(state, sav->state, __func__);
2526 KEY_FREESAV(&sav);
2527 } else {
2528 /* give up to delete this SA */
2529 nzombies++;
2530 }
2531 }
2532
2533 /* Delete sah it has are no savs. */
2534 if (nzombies == 0) {
2535 /* remove from tree of SA index */
2536 if (__LIST_CHAINED(sah))
2537 LIST_REMOVE(sah, chain);
2538 if (sah->sa_route.ro_rt) {
2539 RTFREE(sah->sa_route.ro_rt);
2540 sah->sa_route.ro_rt = NULL;
2541 }
2542 KFREE(sah);
2543 }
2544
2545 crit_exit();
2546 return;
2547 }
2548
2549 /*
2550 * allocating a new SA with LARVAL state. key_add() and key_getspi() call,
2551 * and copy the values of mhp into new buffer.
2552 * When SAD message type is GETSPI:
2553 * to set sequence number from acq_seq++,
2554 * to set zero to SPI.
2555 * not to call key_setsava().
2556 * OUT: NULL : fail
2557 * others : pointer to new secasvar.
2558 *
2559 * does not modify mbuf. does not free mbuf on error.
2560 */
2561 static struct secasvar *
2562 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, struct secashead *sah,
2563 int *errp, const char *where, int tag)
2564 {
2565 struct secasvar *newsav;
2566 const struct sadb_sa *xsa;
2567
2568 /* sanity check */
2569 if (m == NULL || mhp == NULL || mhp->msg == NULL || sah == NULL)
2570 panic("key_newsa: NULL pointer is passed.");
2571
2572 KMALLOC(newsav, struct secasvar *, sizeof(struct secasvar));
2573 if (newsav == NULL) {
2574 ipseclog((LOG_DEBUG, "key_newsa: No more memory.\n"));
2575 *errp = ENOBUFS;
2576 goto done;
2577 }
2578 bzero((caddr_t)newsav, sizeof(struct secasvar));
2579
2580 switch (mhp->msg->sadb_msg_type) {
2581 case SADB_GETSPI:
2582 newsav->spi = 0;
2583
2584 #ifdef IPSEC_DOSEQCHECK
2585 /* sync sequence number */
2586 if (mhp->msg->sadb_msg_seq == 0)
2587 newsav->seq =
2588 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq));
2589 else
2590 #endif
2591 newsav->seq = mhp->msg->sadb_msg_seq;
2592 break;
2593
2594 case SADB_ADD:
2595 /* sanity check */
2596 if (mhp->ext[SADB_EXT_SA] == NULL) {
2597 KFREE(newsav), newsav = NULL;
2598 ipseclog((LOG_DEBUG, "key_newsa: invalid message is passed.\n"));
2599 *errp = EINVAL;
2600 goto done;
2601 }
2602 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
2603 newsav->spi = xsa->sadb_sa_spi;
2604 newsav->seq = mhp->msg->sadb_msg_seq;
2605 break;
2606 default:
2607 KFREE(newsav), newsav = NULL;
2608 *errp = EINVAL;
2609 goto done;
2610 }
2611
2612 /* copy sav values */
2613 if (mhp->msg->sadb_msg_type != SADB_GETSPI) {
2614 *errp = key_setsaval(newsav, m, mhp);
2615 if (*errp) {
2616 KFREE(newsav), newsav = NULL;
2617 goto done;
2618 }
2619 }
2620
2621 /* reset created */
2622 newsav->created = time_second;
2623 newsav->pid = mhp->msg->sadb_msg_pid;
2624
2625 /* add to satree */
2626 newsav->sah = sah;
2627 newsav->refcnt = 1;
2628 newsav->state = SADB_SASTATE_LARVAL;
2629 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav,
2630 secasvar, chain);
2631 done:
2632 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
2633 kprintf("DP key_newsav from %s:%u return SP:%p\n",
2634 where, tag, newsav));
2635
2636 return newsav;
2637 }
2638
2639 /*
2640 * free() SA variable entry.
2641 */
2642 static void
2643 key_delsav(struct secasvar *sav)
2644 {
2645 KASSERT(sav != NULL, ("key_delsav: null sav"));
2646 KASSERT(sav->refcnt == 0,
2647 ("key_delsav: reference count %u > 0", sav->refcnt));
2648
2649 /* remove from SA header */
2650 if (__LIST_CHAINED(sav))
2651 LIST_REMOVE(sav, chain);
2652
2653 /*
2654 * Cleanup xform state. Note that zeroize'ing causes the
2655 * keys to be cleared; otherwise we must do it ourself.
2656 */
2657 if (sav->tdb_xform != NULL) {
2658 sav->tdb_xform->xf_zeroize(sav);
2659 sav->tdb_xform = NULL;
2660 } else {
2661 if (sav->key_auth != NULL)
2662 bzero(_KEYBUF(sav->key_auth), _KEYLEN(sav->key_auth));
2663 if (sav->key_enc != NULL)
2664 bzero(_KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc));
2665 }
2666 if (sav->key_auth != NULL) {
2667 KFREE(sav->key_auth);
2668 sav->key_auth = NULL;
2669 }
2670 if (sav->key_enc != NULL) {
2671 KFREE(sav->key_enc);
2672 sav->key_enc = NULL;
2673 }
2674 if (sav->sched) {
2675 bzero(sav->sched, sav->schedlen);
2676 KFREE(sav->sched);
2677 sav->sched = NULL;
2678 }
2679 if (sav->replay != NULL) {
2680 KFREE(sav->replay);
2681 sav->replay = NULL;
2682 }
2683 if (sav->lft_c != NULL) {
2684 KFREE(sav->lft_c);
2685 sav->lft_c = NULL;
2686 }
2687 if (sav->lft_h != NULL) {
2688 KFREE(sav->lft_h);
2689 sav->lft_h = NULL;
2690 }
2691 if (sav->lft_s != NULL) {
2692 KFREE(sav->lft_s);
2693 sav->lft_s = NULL;
2694 }
2695 if (sav->iv != NULL) {
2696 KFREE(sav->iv);
2697 sav->iv = NULL;
2698 }
2699
2700 KFREE(sav);
2701
2702 return;
2703 }
2704
2705 /*
2706 * search SAD.
2707 * OUT:
2708 * NULL : not found
2709 * others : found, pointer to a SA.
2710 */
2711 static struct secashead *
2712 key_getsah(struct secasindex *saidx)
2713 {
2714 struct secashead *sah;
2715
2716 LIST_FOREACH(sah, &sahtree, chain) {
2717 if (sah->state == SADB_SASTATE_DEAD)
2718 continue;
2719 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID))
2720 return sah;
2721 }
2722
2723 return NULL;
2724 }
2725
2726 /*
2727 * check not to be duplicated SPI.
2728 * NOTE: this function is too slow due to searching all SAD.
2729 * OUT:
2730 * NULL : not found
2731 * others : found, pointer to a SA.
2732 */
2733 static struct secasvar *
2734 key_checkspidup(struct secasindex *saidx, u_int32_t spi)
2735 {
2736 struct secashead *sah;
2737 struct secasvar *sav;
2738
2739 /* check address family */
2740 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) {
2741 ipseclog((LOG_DEBUG, "key_checkspidup: address family mismatched.\n"));
2742 return NULL;
2743 }
2744
2745 /* check all SAD */
2746 LIST_FOREACH(sah, &sahtree, chain) {
2747 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst))
2748 continue;
2749 sav = key_getsavbyspi(sah, spi);
2750 if (sav != NULL)
2751 return sav;
2752 }
2753
2754 return NULL;
2755 }
2756
2757 /*
2758 * search SAD litmited alive SA, protocol, SPI.
2759 * OUT:
2760 * NULL : not found
2761 * others : found, pointer to a SA.
2762 */
2763 static struct secasvar *
2764 key_getsavbyspi(struct secashead *sah, u_int32_t spi)
2765 {
2766 struct secasvar *sav;
2767 u_int stateidx;
2768
2769 /* search all status */
2770 for (stateidx = 0; stateidx < NELEM(saorder_state_alive);
2771 stateidx++) {
2772 u_int state = saorder_state_alive[stateidx];
2773
2774 LIST_FOREACH(sav, &sah->savtree[state], chain) {
2775 /* sanity check */
2776 if (sav->state != state) {
2777 ipseclog((LOG_DEBUG, "key_getsavbyspi: "
2778 "invalid sav->state (queue: %d SA: %d)\n",
2779 state, sav->state));
2780 continue;
2781 }
2782
2783 if (sav->spi == spi)
2784 return sav;
2785 }
2786 }
2787
2788 return NULL;
2789 }
2790
2791 /*
2792 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*.
2793 * You must update these if need.
2794 * OUT: 0: success.
2795 * !0: failure.
2796 *
2797 * does not modify mbuf. does not free mbuf on error.
2798 */
2799 static int
2800 key_setsaval(struct secasvar *sav, struct mbuf *m,
2801 const struct sadb_msghdr *mhp)
2802 {
2803 int error = 0;
2804
2805 /* sanity check */
2806 if (m == NULL || mhp == NULL || mhp->msg == NULL)
2807 panic("key_setsaval: NULL pointer is passed.");
2808
2809 /* initialization */
2810 sav->replay = NULL;
2811 sav->key_auth = NULL;
2812 sav->key_enc = NULL;
2813 sav->sched = NULL;
2814 sav->schedlen = 0;
2815 sav->iv = NULL;
2816 sav->lft_c = NULL;
2817 sav->lft_h = NULL;
2818 sav->lft_s = NULL;
2819 sav->tdb_xform = NULL; /* transform */
2820 sav->tdb_encalgxform = NULL; /* encoding algorithm */
2821 sav->tdb_authalgxform = NULL; /* authentication algorithm */
2822 sav->tdb_compalgxform = NULL; /* compression algorithm */
2823
2824 /* SA */
2825 if (mhp->ext[SADB_EXT_SA] != NULL) {
2826 const struct sadb_sa *sa0;
2827
2828 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA];
2829 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) {
2830 error = EINVAL;
2831 goto fail;
2832 }
2833
2834 sav->alg_auth = sa0->sadb_sa_auth;
2835 sav->alg_enc = sa0->sadb_sa_encrypt;
2836 sav->flags = sa0->sadb_sa_flags;
2837
2838 /* replay window */
2839 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) {
2840 sav->replay =
2841 kmalloc(sizeof(struct secreplay)+sa0->sadb_sa_replay,
2842 M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
2843 if (sav->replay == NULL) {
2844 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2845 error = ENOBUFS;
2846 goto fail;
2847 }
2848 if (sa0->sadb_sa_replay != 0)
2849 sav->replay->bitmap = (caddr_t)(sav->replay+1);
2850 sav->replay->wsize = sa0->sadb_sa_replay;
2851 }
2852 }
2853
2854 /* Authentication keys */
2855 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) {
2856 const struct sadb_key *key0;
2857 int len;
2858
2859 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH];
2860 len = mhp->extlen[SADB_EXT_KEY_AUTH];
2861
2862 error = 0;
2863 if (len < sizeof(*key0)) {
2864 error = EINVAL;
2865 goto fail;
2866 }
2867 switch (mhp->msg->sadb_msg_satype) {
2868 case SADB_SATYPE_AH:
2869 case SADB_SATYPE_ESP:
2870 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
2871 sav->alg_auth != SADB_X_AALG_NULL)
2872 error = EINVAL;
2873 break;
2874 case SADB_X_SATYPE_IPCOMP:
2875 default:
2876 error = EINVAL;
2877 break;
2878 }
2879 if (error) {
2880 ipseclog((LOG_DEBUG, "key_setsaval: invalid key_auth values.\n"));
2881 goto fail;
2882 }
2883
2884 sav->key_auth = (struct sadb_key *)key_newbuf(key0, len);
2885 if (sav->key_auth == NULL) {
2886 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2887 error = ENOBUFS;
2888 goto fail;
2889 }
2890 }
2891
2892 /* Encryption key */
2893 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) {
2894 const struct sadb_key *key0;
2895 int len;
2896
2897 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT];
2898 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT];
2899
2900 error = 0;
2901 if (len < sizeof(*key0)) {
2902 error = EINVAL;
2903 goto fail;
2904 }
2905 switch (mhp->msg->sadb_msg_satype) {
2906 case SADB_SATYPE_ESP:
2907 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) &&
2908 sav->alg_enc != SADB_EALG_NULL) {
2909 error = EINVAL;
2910 break;
2911 }
2912 sav->key_enc = (struct sadb_key *)key_newbuf(key0, len);
2913 if (sav->key_enc == NULL) {
2914 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2915 error = ENOBUFS;
2916 goto fail;
2917 }
2918 break;
2919 case SADB_X_SATYPE_IPCOMP:
2920 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key)))
2921 error = EINVAL;
2922 sav->key_enc = NULL; /*just in case*/
2923 break;
2924 case SADB_SATYPE_AH:
2925 default:
2926 error = EINVAL;
2927 break;
2928 }
2929 if (error) {
2930 ipseclog((LOG_DEBUG, "key_setsatval: invalid key_enc value.\n"));
2931 goto fail;
2932 }
2933 }
2934
2935 /* set iv */
2936 sav->ivlen = 0;
2937
2938 switch (mhp->msg->sadb_msg_satype) {
2939 case SADB_SATYPE_AH:
2940 error = xform_init(sav, XF_AH);
2941 break;
2942 case SADB_SATYPE_ESP:
2943 error = xform_init(sav, XF_ESP);
2944 break;
2945 case SADB_X_SATYPE_IPCOMP:
2946 error = xform_init(sav, XF_IPCOMP);
2947 break;
2948 }
2949 if (error) {
2950 ipseclog((LOG_DEBUG,
2951 "key_setsaval: unable to initialize SA type %u.\n",
2952 mhp->msg->sadb_msg_satype));
2953 goto fail;
2954 }
2955
2956 /* reset created */
2957 sav->created = time_second;
2958
2959 /* make lifetime for CURRENT */
2960 KMALLOC(sav->lft_c, struct sadb_lifetime *,
2961 sizeof(struct sadb_lifetime));
2962 if (sav->lft_c == NULL) {
2963 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2964 error = ENOBUFS;
2965 goto fail;
2966 }
2967
2968 sav->lft_c->sadb_lifetime_len =
2969 PFKEY_UNIT64(sizeof(struct sadb_lifetime));
2970 sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT;
2971 sav->lft_c->sadb_lifetime_allocations = 0;
2972 sav->lft_c->sadb_lifetime_bytes = 0;
2973 sav->lft_c->sadb_lifetime_addtime = time_second;
2974 sav->lft_c->sadb_lifetime_usetime = 0;
2975
2976 /* lifetimes for HARD and SOFT */
2977 {
2978 const struct sadb_lifetime *lft0;
2979
2980 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD];
2981 if (lft0 != NULL) {
2982 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) {
2983 error = EINVAL;
2984 goto fail;
2985 }
2986 sav->lft_h = (struct sadb_lifetime *)key_newbuf(lft0,
2987 sizeof(*lft0));
2988 if (sav->lft_h == NULL) {
2989 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
2990 error = ENOBUFS;
2991 goto fail;
2992 }
2993 /* to be initialize ? */
2994 }
2995
2996 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT];
2997 if (lft0 != NULL) {
2998 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) {
2999 error = EINVAL;
3000 goto fail;
3001 }
3002 sav->lft_s = (struct sadb_lifetime *)key_newbuf(lft0,
3003 sizeof(*lft0));
3004 if (sav->lft_s == NULL) {
3005 ipseclog((LOG_DEBUG, "key_setsaval: No more memory.\n"));
3006 error = ENOBUFS;
3007 goto fail;
3008 }
3009 /* to be initialize ? */
3010 }
3011 }
3012
3013 return 0;
3014
3015 fail:
3016 /* initialization */
3017 if (sav->replay != NULL) {
3018 KFREE(sav->replay);
3019 sav->replay = NULL;
3020 }
3021 if (sav->key_auth != NULL) {
3022 KFREE(sav->key_auth);
3023 sav->key_auth = NULL;
3024 }
3025 if (sav->key_enc != NULL) {
3026 KFREE(sav->key_enc);
3027 sav->key_enc = NULL;
3028 }
3029 if (sav->sched) {
3030 KFREE(sav->sched);
3031 sav->sched = NULL;
3032 }
3033 if (sav->iv != NULL) {
3034 KFREE(sav->iv);
3035 sav->iv = NULL;
3036 }
3037 if (sav->lft_c != NULL) {
3038 KFREE(sav->lft_c);
3039 sav->lft_c = NULL;
3040 }
3041 if (sav->lft_h != NULL) {
3042 KFREE(sav->lft_h);
3043 sav->lft_h = NULL;
3044 }
3045 if (sav->lft_s != NULL) {
3046 KFREE(sav->lft_s);
3047 sav->lft_s = NULL;
3048 }
3049
3050 return error;
3051 }
3052
3053 /*
3054 * validation with a secasvar entry, and set SADB_SATYPE_MATURE.
3055 * OUT: 0: valid
3056 * other: errno
3057 */
3058 static int
3059 key_mature(struct secasvar *sav)
3060 {
3061 int error;
3062
3063 /* check SPI value */
3064 switch (sav->sah->saidx.proto) {
3065 case IPPROTO_ESP:
3066 case IPPROTO_AH:
3067 if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) {
3068 ipseclog((LOG_DEBUG,
3069 "key_mature: illegal range of SPI %u.\n",
3070 (u_int32_t)ntohl(sav->spi)));
3071 return EINVAL;
3072 }
3073 break;
3074 }
3075
3076 /* check satype */
3077 switch (sav->sah->saidx.proto) {
3078 case IPPROTO_ESP:
3079 /* check flags */
3080 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) ==
3081 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) {
3082 ipseclog((LOG_DEBUG, "key_mature: "
3083 "invalid flag (derived) given to old-esp.\n"));
3084 return EINVAL;
3085 }
3086 error = xform_init(sav, XF_ESP);
3087 break;
3088 case IPPROTO_AH:
3089 /* check flags */
3090 if (sav->flags & SADB_X_EXT_DERIV) {
3091 ipseclog((LOG_DEBUG, "key_mature: "
3092 "invalid flag (derived) given to AH SA.\n"));
3093 return EINVAL;
3094 }
3095 if (sav->alg_enc != SADB_EALG_NONE) {
3096 ipseclog((LOG_DEBUG, "key_mature: "
3097 "protocol and algorithm mismated.\n"));
3098 return(EINVAL);
3099 }
3100 error = xform_init(sav, XF_AH);
3101 break;
3102 case IPPROTO_IPCOMP:
3103 if (sav->alg_auth != SADB_AALG_NONE) {
3104 ipseclog((LOG_DEBUG, "key_mature: "
3105 "protocol and algorithm mismated.\n"));
3106 return(EINVAL);
3107 }
3108 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0
3109 && ntohl(sav->spi) >= 0x10000) {
3110 ipseclog((LOG_DEBUG, "key_mature: invalid cpi for IPComp.\n"));
3111 return(EINVAL);
3112 }
3113 error = xform_init(sav, XF_IPCOMP);
3114 break;
3115 default:
3116 ipseclog((LOG_DEBUG, "key_mature: Invalid satype.\n"));
3117 error = EPROTONOSUPPORT;
3118 break;
3119 }
3120 if (error == 0)
3121 key_sa_chgstate(sav, SADB_SASTATE_MATURE);
3122 return (error);
3123 }
3124
3125 /*
3126 * subroutine for SADB_GET and SADB_DUMP.
3127 */
3128 static struct mbuf *
3129 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype,
3130 u_int32_t seq, u_int32_t pid)
3131 {
3132 struct mbuf *result = NULL, *tres = NULL, *m;
3133 int l = 0;
3134 int i;
3135 void *p;
3136 int dumporder[] = {
3137 SADB_EXT_SA, SADB_X_EXT_SA2,
3138 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT,
3139 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC,
3140 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH,
3141 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC,
3142 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY,
3143 };
3144
3145 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt);
3146 if (m == NULL)
3147 goto fail;
3148 result = m;
3149
3150 for (i = NELEM(dumporder) - 1; i >= 0; i--) {
3151 m = NULL;
3152 p = NULL;
3153 switch (dumporder[i]) {
3154 case SADB_EXT_SA:
3155 m = key_setsadbsa(sav);
3156 if (!m)
3157 goto fail;
3158 break;
3159
3160 case SADB_X_EXT_SA2:
3161 m = key_setsadbxsa2(sav->sah->saidx.mode,
3162 sav->replay ? sav->replay->count : 0,
3163 sav->sah->saidx.reqid);
3164 if (!m)
3165 goto fail;
3166 break;
3167
3168 case SADB_EXT_ADDRESS_SRC:
3169 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC,
3170 &sav->sah->saidx.src.sa,
3171 FULLMASK, IPSEC_ULPROTO_ANY);
3172 if (!m)
3173 goto fail;
3174 break;
3175
3176 case SADB_EXT_ADDRESS_DST:
3177 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST,
3178 &sav->sah->saidx.dst.sa,
3179 FULLMASK, IPSEC_ULPROTO_ANY);
3180 if (!m)
3181 goto fail;
3182 break;
3183
3184 case SADB_EXT_KEY_AUTH:
3185 if (!sav->key_auth)
3186 continue;
3187 l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len);
3188 p = sav->key_auth;
3189 break;
3190
3191 case SADB_EXT_KEY_ENCRYPT:
3192 if (!sav->key_enc)
3193 continue;
3194 l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len);
3195 p = sav->key_enc;
3196 break;
3197
3198 case SADB_EXT_LIFETIME_CURRENT:
3199 if (!sav->lft_c)
3200 continue;
3201 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len);
3202 p = sav->lft_c;
3203 break;
3204
3205 case SADB_EXT_LIFETIME_HARD:
3206 if (!sav->lft_h)
3207 continue;
3208 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len);
3209 p = sav->lft_h;
3210 break;
3211
3212 case SADB_EXT_LIFETIME_SOFT:
3213 if (!sav->lft_s)
3214 continue;
3215 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len);
3216 p = sav->lft_s;
3217 break;
3218
3219 case SADB_EXT_ADDRESS_PROXY:
3220 case SADB_EXT_IDENTITY_SRC:
3221 case SADB_EXT_IDENTITY_DST:
3222 /* XXX: should we brought from SPD ? */
3223 case SADB_EXT_SENSITIVITY:
3224 default:
3225 continue;
3226 }
3227
3228 if ((!m && !p) || (m && p))
3229 goto fail;
3230 if (p && tres) {
3231 M_PREPEND(tres, l, M_NOWAIT);
3232 if (!tres)
3233 goto fail;
3234 bcopy(p, mtod(tres, caddr_t), l);
3235 continue;
3236 }
3237 if (p) {
3238 m = key_alloc_mbuf(l);
3239 if (!m)
3240 goto fail;
3241 m_copyback(m, 0, l, p);
3242 }
3243
3244 if (tres)
3245 m_cat(m, tres);
3246 tres = m;
3247 }
3248
3249 m_cat(result, tres);
3250
3251 if (result->m_len < sizeof(struct sadb_msg)) {
3252 result = m_pullup(result, sizeof(struct sadb_msg));
3253 if (result == NULL)
3254 goto fail;
3255 }
3256 result->m_pkthdr.len = m_lengthm(result, NULL);
3257 mtod(result, struct sadb_msg *)->sadb_msg_len =
3258 PFKEY_UNIT64(result->m_pkthdr.len);
3259
3260 return result;
3261
3262 fail:
3263 m_freem(result);
3264 m_freem(tres);
3265 return NULL;
3266 }
3267
3268 /*
3269 * set data into sadb_msg.
3270 */
3271 static struct mbuf *
3272 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq,
3273 pid_t pid, u_int16_t reserved)
3274 {
3275 struct mbuf *m;
3276 struct sadb_msg *p;
3277 int len;
3278
3279 len = PFKEY_ALIGN8(sizeof(struct sadb_msg));
3280 if (len > MCLBYTES)
3281 return NULL;
3282 m = m_getb(len, M_NOWAIT, MT_DATA, M_PKTHDR);
3283 if (!m)
3284 return NULL;
3285 m->m_pkthdr.len = m->m_len = len;
3286
3287 p = mtod(m, struct sadb_msg *);
3288
3289 bzero(p, len);
3290 p->sadb_msg_version = PF_KEY_V2;
3291 p->sadb_msg_type = type;
3292 p->sadb_msg_errno = 0;
3293 p->sadb_msg_satype = satype;
3294 p->sadb_msg_len = PFKEY_UNIT64(tlen);
3295 p->sadb_msg_reserved = reserved;
3296 p->sadb_msg_seq = seq;
3297 p->sadb_msg_pid = (u_int32_t)pid;
3298
3299 return m;
3300 }
3301
3302 /*
3303 * copy secasvar data into sadb_address.
3304 */
3305 static struct mbuf *
3306 key_setsadbsa(struct secasvar *sav)
3307 {
3308 struct mbuf *m;
3309 struct sadb_sa *p;
3310 int len;
3311
3312 len = PFKEY_ALIGN8(sizeof(struct sadb_sa));
3313 m = key_alloc_mbuf(len);
3314 if (!m || m->m_next) { /*XXX*/
3315 if (m)
3316 m_freem(m);
3317 return NULL;
3318 }
3319
3320 p = mtod(m, struct sadb_sa *);
3321
3322 bzero(p, len);
3323 p->sadb_sa_len = PFKEY_UNIT64(len);
3324 p->sadb_sa_exttype = SADB_EXT_SA;
3325 p->sadb_sa_spi = sav->spi;
3326 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0);
3327 p->sadb_sa_state = sav->state;
3328 p->sadb_sa_auth = sav->alg_auth;
3329 p->sadb_sa_encrypt = sav->alg_enc;
3330 p->sadb_sa_flags = sav->flags;
3331
3332 return m;
3333 }
3334
3335 /*
3336 * set data into sadb_address.
3337 */
3338 static struct mbuf *
3339 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen,
3340 u_int16_t ul_proto)
3341 {
3342 struct mbuf *m;
3343 struct sadb_address *p;
3344 size_t len;
3345
3346 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) +
3347 PFKEY_ALIGN8(saddr->sa_len);
3348 m = key_alloc_mbuf(len);
3349 if (!m || m->m_next) { /*XXX*/
3350 if (m)
3351 m_freem(m);
3352 return NULL;
3353 }
3354
3355 p = mtod(m, struct sadb_address *);
3356
3357 bzero(p, len);
3358 p->sadb_address_len = PFKEY_UNIT64(len);
3359 p->sadb_address_exttype = exttype;
3360 p->sadb_address_proto = ul_proto;
3361 if (prefixlen == FULLMASK) {
3362 switch (saddr->sa_family) {
3363 case AF_INET:
3364 prefixlen = sizeof(struct in_addr) << 3;
3365 break;
3366 case AF_INET6:
3367 prefixlen = sizeof(struct in6_addr) << 3;
3368 break;
3369 default:
3370 ; /*XXX*/
3371 }
3372 }
3373 p->sadb_address_prefixlen = prefixlen;
3374 p->sadb_address_reserved = 0;
3375
3376 bcopy(saddr,
3377 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)),
3378 saddr->sa_len);
3379
3380 return m;
3381 }
3382
3383 #if 0
3384 /*
3385 * set data into sadb_ident.
3386 */
3387 static struct mbuf *
3388 key_setsadbident(u_int16_t exttype, u_int16_t idtype, caddr_t string,
3389 int stringlen, u_int64_t id)
3390 {
3391 struct mbuf *m;
3392 struct sadb_ident *p;
3393 size_t len;
3394
3395 len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen);
3396 m = key_alloc_mbuf(len);
3397 if (!m || m->m_next) { /*XXX*/
3398 if (m)
3399 m_freem(m);
3400 return NULL;
3401 }
3402
3403 p = mtod(m, struct sadb_ident *);
3404
3405 bzero(p, len);
3406 p->sadb_ident_len = PFKEY_UNIT64(len);
3407 p->sadb_ident_exttype = exttype;
3408 p->sadb_ident_type = idtype;
3409 p->sadb_ident_reserved = 0;
3410 p->sadb_ident_id = id;
3411
3412 bcopy(string,
3413 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_ident)),
3414 stringlen);
3415
3416 return m;
3417 }
3418 #endif
3419
3420 /*
3421 * set data into sadb_x_sa2.
3422 */
3423 static struct mbuf *
3424 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid)
3425 {
3426 struct mbuf *m;
3427 struct sadb_x_sa2 *p;
3428 size_t len;
3429
3430 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2));
3431 m = key_alloc_mbuf(len);
3432 if (!m || m->m_next) { /*XXX*/
3433 if (m)
3434 m_freem(m);
3435 return NULL;
3436 }
3437
3438 p = mtod(m, struct sadb_x_sa2 *);
3439
3440 bzero(p, len);
3441 p->sadb_x_sa2_len = PFKEY_UNIT64(len);
3442 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2;
3443 p->sadb_x_sa2_mode = mode;
3444 p->sadb_x_sa2_reserved1 = 0;
3445 p->sadb_x_sa2_reserved2 = 0;
3446 p->sadb_x_sa2_sequence = seq;
3447 p->sadb_x_sa2_reqid = reqid;
3448
3449 return m;
3450 }
3451
3452 /*
3453 * set data into sadb_x_policy
3454 */
3455 static struct mbuf *
3456 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id)
3457 {
3458 struct mbuf *m;
3459 struct sadb_x_policy *p;
3460 size_t len;
3461
3462 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy));
3463 m = key_alloc_mbuf(len);
3464 if (!m || m->m_next) { /*XXX*/
3465 if (m)
3466 m_freem(m);
3467 return NULL;
3468 }
3469
3470 p = mtod(m, struct sadb_x_policy *);
3471
3472 bzero(p, len);
3473 p->sadb_x_policy_len = PFKEY_UNIT64(len);
3474 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
3475 p->sadb_x_policy_type = type;
3476 p->sadb_x_policy_dir = dir;
3477 p->sadb_x_policy_id = id;
3478
3479 return m;
3480 }
3481
3482 /* %%% utilities */
3483 /*
3484 * copy a buffer into the new buffer allocated.
3485 */
3486 static void *
3487 key_newbuf(const void *src, u_int len)
3488 {
3489 caddr_t new;
3490
3491 KMALLOC(new, caddr_t, len);
3492 if (new == NULL) {
3493 ipseclog((LOG_DEBUG, "key_newbuf: No more memory.\n"));
3494 return NULL;
3495 }
3496 bcopy(src, new, len);
3497
3498 return new;
3499 }
3500
3501 /* compare my own address
3502 * OUT: 1: true, i.e. my address.
3503 * 0: false
3504 */
3505 int
3506 key_ismyaddr(struct sockaddr *sa)
3507 {
3508 #ifdef INET
3509 struct sockaddr_in *sin;
3510 struct in_ifaddr_container *iac;
3511 #endif
3512
3513 /* sanity check */
3514 if (sa == NULL)
3515 panic("key_ismyaddr: NULL pointer is passed.");
3516
3517 switch (sa->sa_family) {
3518 #ifdef INET
3519 case AF_INET:
3520 sin = (struct sockaddr_in *)sa;
3521 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
3522 struct in_ifaddr *ia = iac->ia;
3523
3524 if (sin->sin_family == ia->ia_addr.sin_family &&
3525 sin->sin_len == ia->ia_addr.sin_len &&
3526 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
3527 {
3528 return 1;
3529 }
3530 }
3531 break;
3532 #endif
3533 #ifdef INET6
3534 case AF_INET6:
3535 return key_ismyaddr6((struct sockaddr_in6 *)sa);
3536 #endif
3537 }
3538
3539 return 0;
3540 }
3541
3542 #ifdef INET6
3543 /*
3544 * compare my own address for IPv6.
3545 * 1: ours
3546 * 0: other
3547 * NOTE: derived ip6_input() in KAME. This is necessary to modify more.
3548 */
3549 static int
3550 key_ismyaddr6(struct sockaddr_in6 *sin6)
3551 {
3552 struct in6_ifaddr *ia;
3553 struct in6_multi *in6m;
3554
3555 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
3556 if (key_sockaddrcmp((struct sockaddr *)&sin6,
3557 (struct sockaddr *)&ia->ia_addr, 0) == 0)
3558 return 1;
3559
3560 /*
3561 * XXX Multicast
3562 * XXX why do we care about multlicast here while we don't care
3563 * about IPv4 multicast??
3564 * XXX scope
3565 */
3566 in6m = IN6_LOOKUP_MULTI(&sin6->sin6_addr, ia->ia_ifp);
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.");
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, M_NOWAIT, 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.");
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.");
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.");
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.");
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.");
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 < NELEM(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.");
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, M_NOWAIT, 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, M_NOWAIT, 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, M_NOWAIT);
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, M_NOWAIT, 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, M_NOWAIT);
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, M_NOWAIT);
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.");
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 = NULL;
5781
5782 /* sanity check */
5783 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
5784 panic("key_register: NULL pointer is passed.");
5785
5786 /* check for invalid register message */
5787 if (mhp->msg->sadb_msg_satype >= NELEM(regtree))
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, M_NOWAIT, 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.");
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.");
5972 if (sav->sah == NULL)
5973 panic("key_expire: Why was SA index in SA NULL.");
5974 if ((satype = key_proto2satype(sav->sah->saidx.proto)) == 0)
5975 panic("key_expire: invalid proto is passed.");
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.");
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 < NELEM(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 mbuf *n;
6161
6162 /* sanity check */
6163 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6164 panic("key_dump: NULL pointer is passed.");
6165
6166 /* map satype to proto */
6167 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) {
6168 ipseclog((LOG_DEBUG, "key_dump: invalid satype is passed.\n"));
6169 return key_senderror(so, m, EINVAL);
6170 }
6171
6172 /* count sav entries to be sent to the userland. */
6173 cnt = 0;
6174 LIST_FOREACH(sah, &sahtree, chain) {
6175 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC &&
6176 proto != sah->saidx.proto)
6177 continue;
6178
6179 for (stateidx = 0; stateidx < NELEM(saorder_state_any);
6180 stateidx++) {
6181 state = saorder_state_any[stateidx];
6182 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6183 cnt++;
6184 }
6185 }
6186 }
6187
6188 if (cnt == 0)
6189 return key_senderror(so, m, ENOENT);
6190
6191 /* send this to the userland, one at a time. */
6192 LIST_FOREACH(sah, &sahtree, chain) {
6193 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC
6194 && proto != sah->saidx.proto)
6195 continue;
6196
6197 /* map proto to satype */
6198 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) {
6199 ipseclog((LOG_DEBUG, "key_dump: there was invalid proto in SAD.\n"));
6200 return key_senderror(so, m, EINVAL);
6201 }
6202
6203 for (stateidx = 0; stateidx < NELEM(saorder_state_any);
6204 stateidx++) {
6205 state = saorder_state_any[stateidx];
6206 LIST_FOREACH(sav, &sah->savtree[state], chain) {
6207 n = key_setdumpsa(sav, SADB_DUMP, satype,
6208 --cnt, mhp->msg->sadb_msg_pid);
6209 if (!n)
6210 return key_senderror(so, m, ENOBUFS);
6211
6212 key_sendup_mbuf(so, n, KEY_SENDUP_ONE);
6213 }
6214 }
6215 }
6216
6217 m_freem(m);
6218 return 0;
6219 }
6220
6221 /*
6222 * SADB_X_PROMISC processing
6223 *
6224 * m will always be freed.
6225 */
6226 static int
6227 key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp)
6228 {
6229 int olen;
6230
6231 /* sanity check */
6232 if (so == NULL || m == NULL || mhp == NULL || mhp->msg == NULL)
6233 panic("key_promisc: NULL pointer is passed.");
6234
6235 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6236
6237 if (olen < sizeof(struct sadb_msg)) {
6238 #if 1
6239 return key_senderror(so, m, EINVAL);
6240 #else
6241 m_freem(m);
6242 return 0;
6243 #endif
6244 } else if (olen == sizeof(struct sadb_msg)) {
6245 /* enable/disable promisc mode */
6246 struct keycb *kp;
6247
6248 if ((kp = (struct keycb *)sotorawcb(so)) == NULL)
6249 return key_senderror(so, m, EINVAL);
6250 mhp->msg->sadb_msg_errno = 0;
6251 switch (mhp->msg->sadb_msg_satype) {
6252 case 0:
6253 case 1:
6254 kp->kp_promisc = mhp->msg->sadb_msg_satype;
6255 break;
6256 default:
6257 return key_senderror(so, m, EINVAL);
6258 }
6259
6260 /* send the original message back to everyone */
6261 mhp->msg->sadb_msg_errno = 0;
6262 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6263 } else {
6264 /* send packet as is */
6265
6266 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg)));
6267
6268 /* TODO: if sadb_msg_seq is specified, send to specific pid */
6269 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL);
6270 }
6271 }
6272
6273 static int (*key_typesw[]) (struct socket *, struct mbuf *,
6274 const struct sadb_msghdr *) = {
6275 NULL, /* SADB_RESERVED */
6276 key_getspi, /* SADB_GETSPI */
6277 key_update, /* SADB_UPDATE */
6278 key_add, /* SADB_ADD */
6279 key_delete, /* SADB_DELETE */
6280 key_get, /* SADB_GET */
6281 key_acquire2, /* SADB_ACQUIRE */
6282 key_register, /* SADB_REGISTER */
6283 NULL, /* SADB_EXPIRE */
6284 key_flush, /* SADB_FLUSH */
6285 key_dump, /* SADB_DUMP */
6286 key_promisc, /* SADB_X_PROMISC */
6287 NULL, /* SADB_X_PCHANGE */
6288 key_spdadd, /* SADB_X_SPDUPDATE */
6289 key_spdadd, /* SADB_X_SPDADD */
6290 key_spddelete, /* SADB_X_SPDDELETE */
6291 key_spdget, /* SADB_X_SPDGET */
6292 NULL, /* SADB_X_SPDACQUIRE */
6293 key_spddump, /* SADB_X_SPDDUMP */
6294 key_spdflush, /* SADB_X_SPDFLUSH */
6295 key_spdadd, /* SADB_X_SPDSETIDX */
6296 NULL, /* SADB_X_SPDEXPIRE */
6297 key_spddelete2, /* SADB_X_SPDDELETE2 */
6298 };
6299
6300 /*
6301 * parse sadb_msg buffer to process PFKEYv2,
6302 * and create a data to response if needed.
6303 * I think to be dealed with mbuf directly.
6304 * IN:
6305 * msgp : pointer to pointer to a received buffer pulluped.
6306 * This is rewrited to response.
6307 * so : pointer to socket.
6308 * OUT:
6309 * length for buffer to send to user process.
6310 */
6311 int
6312 key_parse(struct mbuf *m, struct socket *so)
6313 {
6314 struct sadb_msg *msg;
6315 struct sadb_msghdr mh;
6316 u_int orglen;
6317 int error;
6318 int target;
6319
6320 /* sanity check */
6321 if (m == NULL || so == NULL)
6322 panic("key_parse: NULL pointer is passed.");
6323
6324 #if 0 /*kdebug_sadb assumes msg in linear buffer*/
6325 KEYDEBUG(KEYDEBUG_KEY_DUMP,
6326 ipseclog((LOG_DEBUG, "key_parse: passed sadb_msg\n"));
6327 kdebug_sadb(msg));
6328 #endif
6329
6330 if (m->m_len < sizeof(struct sadb_msg)) {
6331 m = m_pullup(m, sizeof(struct sadb_msg));
6332 if (!m)
6333 return ENOBUFS;
6334 }
6335 msg = mtod(m, struct sadb_msg *);
6336 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len);
6337 target = KEY_SENDUP_ONE;
6338
6339 if ((m->m_flags & M_PKTHDR) == 0 ||
6340 m->m_pkthdr.len != m->m_pkthdr.len) {
6341 ipseclog((LOG_DEBUG, "key_parse: invalid message length.\n"));
6342 pfkeystat.out_invlen++;
6343 error = EINVAL;
6344 goto senderror;
6345 }
6346
6347 if (msg->sadb_msg_version != PF_KEY_V2) {
6348 ipseclog((LOG_DEBUG,
6349 "key_parse: PF_KEY version %u is mismatched.\n",
6350 msg->sadb_msg_version));
6351 pfkeystat.out_invver++;
6352 error = EINVAL;
6353 goto senderror;
6354 }
6355
6356 if (msg->sadb_msg_type > SADB_MAX) {
6357 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6358 msg->sadb_msg_type));
6359 pfkeystat.out_invmsgtype++;
6360 error = EINVAL;
6361 goto senderror;
6362 }
6363
6364 /* for old-fashioned code - should be nuked */
6365 if (m->m_pkthdr.len > MCLBYTES) {
6366 m_freem(m);
6367 return ENOBUFS;
6368 }
6369 if (m->m_next) {
6370 struct mbuf *n;
6371
6372 n = m_getb(m->m_pkthdr.len, M_NOWAIT, MT_DATA, M_PKTHDR);
6373 if (!n) {
6374 m_freem(m);
6375 return ENOBUFS;
6376 }
6377 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
6378 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len;
6379 m_freem(m);
6380 m = n;
6381 }
6382
6383 /* align the mbuf chain so that extensions are in contiguous region. */
6384 error = key_align(m, &mh);
6385 if (error)
6386 return error;
6387
6388 msg = mh.msg;
6389
6390 /* check SA type */
6391 switch (msg->sadb_msg_satype) {
6392 case SADB_SATYPE_UNSPEC:
6393 switch (msg->sadb_msg_type) {
6394 case SADB_GETSPI:
6395 case SADB_UPDATE:
6396 case SADB_ADD:
6397 case SADB_DELETE:
6398 case SADB_GET:
6399 case SADB_ACQUIRE:
6400 case SADB_EXPIRE:
6401 ipseclog((LOG_DEBUG, "key_parse: must specify satype "
6402 "when msg type=%u.\n", msg->sadb_msg_type));
6403 pfkeystat.out_invsatype++;
6404 error = EINVAL;
6405 goto senderror;
6406 }
6407 break;
6408 case SADB_SATYPE_AH:
6409 case SADB_SATYPE_ESP:
6410 case SADB_X_SATYPE_IPCOMP:
6411 switch (msg->sadb_msg_type) {
6412 case SADB_X_SPDADD:
6413 case SADB_X_SPDDELETE:
6414 case SADB_X_SPDGET:
6415 case SADB_X_SPDDUMP:
6416 case SADB_X_SPDFLUSH:
6417 case SADB_X_SPDSETIDX:
6418 case SADB_X_SPDUPDATE:
6419 case SADB_X_SPDDELETE2:
6420 ipseclog((LOG_DEBUG, "key_parse: illegal satype=%u\n",
6421 msg->sadb_msg_type));
6422 pfkeystat.out_invsatype++;
6423 error = EINVAL;
6424 goto senderror;
6425 }
6426 break;
6427 case SADB_SATYPE_RSVP:
6428 case SADB_SATYPE_OSPFV2:
6429 case SADB_SATYPE_RIPV2:
6430 case SADB_SATYPE_MIP:
6431 ipseclog((LOG_DEBUG, "key_parse: type %u isn't supported.\n",
6432 msg->sadb_msg_satype));
6433 pfkeystat.out_invsatype++;
6434 error = EOPNOTSUPP;
6435 goto senderror;
6436 case 1: /* XXX: What does it do? */
6437 if (msg->sadb_msg_type == SADB_X_PROMISC)
6438 break;
6439 /*FALLTHROUGH*/
6440 default:
6441 ipseclog((LOG_DEBUG, "key_parse: invalid type %u is passed.\n",
6442 msg->sadb_msg_satype));
6443 pfkeystat.out_invsatype++;
6444 error = EINVAL;
6445 goto senderror;
6446 }
6447
6448 /* check field of upper layer protocol and address family */
6449 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL
6450 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) {
6451 struct sadb_address *src0, *dst0;
6452 u_int plen;
6453
6454 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]);
6455 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]);
6456
6457 /* check upper layer protocol */
6458 if (src0->sadb_address_proto != dst0->sadb_address_proto) {
6459 ipseclog((LOG_DEBUG, "key_parse: upper layer protocol mismatched.\n"));
6460 pfkeystat.out_invaddr++;
6461 error = EINVAL;
6462 goto senderror;
6463 }
6464
6465 /* check family */
6466 if (PFKEY_ADDR_SADDR(src0)->sa_family !=
6467 PFKEY_ADDR_SADDR(dst0)->sa_family) {
6468 ipseclog((LOG_DEBUG, "key_parse: address family mismatched.\n"));
6469 pfkeystat.out_invaddr++;
6470 error = EINVAL;
6471 goto senderror;
6472 }
6473 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6474 PFKEY_ADDR_SADDR(dst0)->sa_len) {
6475 ipseclog((LOG_DEBUG,
6476 "key_parse: address struct size mismatched.\n"));
6477 pfkeystat.out_invaddr++;
6478 error = EINVAL;
6479 goto senderror;
6480 }
6481
6482 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6483 case AF_INET:
6484 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6485 sizeof(struct sockaddr_in)) {
6486 pfkeystat.out_invaddr++;
6487 error = EINVAL;
6488 goto senderror;
6489 }
6490 break;
6491 case AF_INET6:
6492 if (PFKEY_ADDR_SADDR(src0)->sa_len !=
6493 sizeof(struct sockaddr_in6)) {
6494 pfkeystat.out_invaddr++;
6495 error = EINVAL;
6496 goto senderror;
6497 }
6498 break;
6499 default:
6500 ipseclog((LOG_DEBUG,
6501 "key_parse: unsupported address family.\n"));
6502 pfkeystat.out_invaddr++;
6503 error = EAFNOSUPPORT;
6504 goto senderror;
6505 }
6506
6507 switch (PFKEY_ADDR_SADDR(src0)->sa_family) {
6508 case AF_INET:
6509 plen = sizeof(struct in_addr) << 3;
6510 break;
6511 case AF_INET6:
6512 plen = sizeof(struct in6_addr) << 3;
6513 break;
6514 default:
6515 plen = 0; /*fool gcc*/
6516 break;
6517 }
6518
6519 /* check max prefix length */
6520 if (src0->sadb_address_prefixlen > plen ||
6521 dst0->sadb_address_prefixlen > plen) {
6522 ipseclog((LOG_DEBUG,
6523 "key_parse: illegal prefixlen.\n"));
6524 pfkeystat.out_invaddr++;
6525 error = EINVAL;
6526 goto senderror;
6527 }
6528
6529 /*
6530 * prefixlen == 0 is valid because there can be a case when
6531 * all addresses are matched.
6532 */
6533 }
6534
6535 if (msg->sadb_msg_type >= NELEM(key_typesw) ||
6536 key_typesw[msg->sadb_msg_type] == NULL) {
6537 pfkeystat.out_invmsgtype++;
6538 error = EINVAL;
6539 goto senderror;
6540 }
6541
6542 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh);
6543
6544 senderror:
6545 msg->sadb_msg_errno = error;
6546 return key_sendup_mbuf(so, m, target);
6547 }
6548
6549 static int
6550 key_senderror(struct socket *so, struct mbuf *m, int code)
6551 {
6552 struct sadb_msg *msg;
6553
6554 if (m->m_len < sizeof(struct sadb_msg))
6555 panic("invalid mbuf passed to key_senderror");
6556
6557 msg = mtod(m, struct sadb_msg *);
6558 msg->sadb_msg_errno = code;
6559 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE);
6560 }
6561
6562 /*
6563 * set the pointer to each header into message buffer.
6564 * m will be freed on error.
6565 * XXX larger-than-MCLBYTES extension?
6566 */
6567 static int
6568 key_align(struct mbuf *m, struct sadb_msghdr *mhp)
6569 {
6570 struct mbuf *n;
6571 struct sadb_ext *ext;
6572 size_t off, end;
6573 int extlen;
6574 int toff;
6575
6576 /* sanity check */
6577 if (m == NULL || mhp == NULL)
6578 panic("key_align: NULL pointer is passed.");
6579 if (m->m_len < sizeof(struct sadb_msg))
6580 panic("invalid mbuf passed to key_align");
6581
6582 /* initialize */
6583 bzero(mhp, sizeof(*mhp));
6584
6585 mhp->msg = mtod(m, struct sadb_msg *);
6586 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */
6587
6588 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len);
6589 extlen = end; /*just in case extlen is not updated*/
6590 for (off = sizeof(struct sadb_msg); off < end; off += extlen) {
6591 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff);
6592 if (!n) {
6593 /* m is already freed */
6594 return ENOBUFS;
6595 }
6596 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6597
6598 /* set pointer */
6599 switch (ext->sadb_ext_type) {
6600 case SADB_EXT_SA:
6601 case SADB_EXT_ADDRESS_SRC:
6602 case SADB_EXT_ADDRESS_DST:
6603 case SADB_EXT_ADDRESS_PROXY:
6604 case SADB_EXT_LIFETIME_CURRENT:
6605 case SADB_EXT_LIFETIME_HARD:
6606 case SADB_EXT_LIFETIME_SOFT:
6607 case SADB_EXT_KEY_AUTH:
6608 case SADB_EXT_KEY_ENCRYPT:
6609 case SADB_EXT_IDENTITY_SRC:
6610 case SADB_EXT_IDENTITY_DST:
6611 case SADB_EXT_SENSITIVITY:
6612 case SADB_EXT_PROPOSAL:
6613 case SADB_EXT_SUPPORTED_AUTH:
6614 case SADB_EXT_SUPPORTED_ENCRYPT:
6615 case SADB_EXT_SPIRANGE:
6616 case SADB_X_EXT_POLICY:
6617 case SADB_X_EXT_SA2:
6618 /* duplicate check */
6619 /*
6620 * XXX Are there duplication payloads of either
6621 * KEY_AUTH or KEY_ENCRYPT ?
6622 */
6623 if (mhp->ext[ext->sadb_ext_type] != NULL) {
6624 ipseclog((LOG_DEBUG,
6625 "key_align: duplicate ext_type %u "
6626 "is passed.\n", ext->sadb_ext_type));
6627 m_freem(m);
6628 pfkeystat.out_dupext++;
6629 return EINVAL;
6630 }
6631 break;
6632 default:
6633 ipseclog((LOG_DEBUG,
6634 "key_align: invalid ext_type %u is passed.\n",
6635 ext->sadb_ext_type));
6636 m_freem(m);
6637 pfkeystat.out_invexttype++;
6638 return EINVAL;
6639 }
6640
6641 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len);
6642
6643 if (key_validate_ext(ext, extlen)) {
6644 m_freem(m);
6645 pfkeystat.out_invlen++;
6646 return EINVAL;
6647 }
6648
6649 n = m_pulldown(m, off, extlen, &toff);
6650 if (!n) {
6651 /* m is already freed */
6652 return ENOBUFS;
6653 }
6654 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff);
6655
6656 mhp->ext[ext->sadb_ext_type] = ext;
6657 mhp->extoff[ext->sadb_ext_type] = off;
6658 mhp->extlen[ext->sadb_ext_type] = extlen;
6659 }
6660
6661 if (off != end) {
6662 m_freem(m);
6663 pfkeystat.out_invlen++;
6664 return EINVAL;
6665 }
6666
6667 return 0;
6668 }
6669
6670 static int
6671 key_validate_ext(const struct sadb_ext *ext, int len)
6672 {
6673 const struct sockaddr *sa;
6674 enum { NONE, ADDR } checktype = NONE;
6675 int baselen = 0;
6676 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len);
6677
6678 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len))
6679 return EINVAL;
6680
6681 /* if it does not match minimum/maximum length, bail */
6682 if (ext->sadb_ext_type >= NELEM(minsize) ||
6683 ext->sadb_ext_type >= NELEM(maxsize))
6684 return EINVAL;
6685 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type])
6686 return EINVAL;
6687 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type])
6688 return EINVAL;
6689
6690 /* more checks based on sadb_ext_type XXX need more */
6691 switch (ext->sadb_ext_type) {
6692 case SADB_EXT_ADDRESS_SRC:
6693 case SADB_EXT_ADDRESS_DST:
6694 case SADB_EXT_ADDRESS_PROXY:
6695 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address));
6696 checktype = ADDR;
6697 break;
6698 case SADB_EXT_IDENTITY_SRC:
6699 case SADB_EXT_IDENTITY_DST:
6700 if (((const struct sadb_ident *)ext)->sadb_ident_type ==
6701 SADB_X_IDENTTYPE_ADDR) {
6702 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident));
6703 checktype = ADDR;
6704 } else
6705 checktype = NONE;
6706 break;
6707 default:
6708 checktype = NONE;
6709 break;
6710 }
6711
6712 switch (checktype) {
6713 case NONE:
6714 break;
6715 case ADDR:
6716 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen);
6717 if (len < baselen + sal)
6718 return EINVAL;
6719 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len)
6720 return EINVAL;
6721 break;
6722 }
6723
6724 return 0;
6725 }
6726
6727 void
6728 key_init(void)
6729 {
6730 int i;
6731
6732 for (i = 0; i < IPSEC_DIR_MAX; i++) {
6733 LIST_INIT(&sptree[i]);
6734 }
6735
6736 LIST_INIT(&sahtree);
6737
6738 for (i = 0; i <= SADB_SATYPE_MAX; i++) {
6739 LIST_INIT(&regtree[i]);
6740 }
6741
6742 #ifndef IPSEC_NONBLOCK_ACQUIRE
6743 LIST_INIT(&acqtree);
6744 #endif
6745 LIST_INIT(&spacqtree);
6746
6747 /* system default */
6748 ip4_def_policy.policy = IPSEC_POLICY_NONE;
6749 ip4_def_policy.refcnt++; /*never reclaim this*/
6750
6751 #ifndef IPSEC_DEBUG2
6752 callout_init(&key_timehandler_ch);
6753 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL);
6754 #endif /*IPSEC_DEBUG2*/
6755
6756 /* initialize key statistics */
6757 keystat.getspi_count = 1;
6758
6759 kprintf("IPsec: Initialized Security Association Processing.\n");
6760
6761 return;
6762 }
6763
6764 /*
6765 * XXX: maybe This function is called after INBOUND IPsec processing.
6766 *
6767 * Special check for tunnel-mode packets.
6768 * We must make some checks for consistency between inner and outer IP header.
6769 *
6770 * xxx more checks to be provided
6771 */
6772 int
6773 key_checktunnelsanity(struct secasvar *sav, u_int family, caddr_t src,
6774 caddr_t dst)
6775 {
6776 /* sanity check */
6777 if (sav->sah == NULL)
6778 panic("sav->sah == NULL at key_checktunnelsanity");
6779
6780 /* XXX: check inner IP header */
6781
6782 return 1;
6783 }
6784
6785 #if 0
6786 #define hostnamelen strlen(hostname)
6787
6788 /*
6789 * Get FQDN for the host.
6790 * If the administrator configured hostname (by hostname(1)) without
6791 * domain name, returns nothing.
6792 */
6793 static const char *
6794 key_getfqdn(void)
6795 {
6796 int i;
6797 int hasdot;
6798 static char fqdn[MAXHOSTNAMELEN + 1];
6799
6800 if (!hostnamelen)
6801 return NULL;
6802
6803 /* check if it comes with domain name. */
6804 hasdot = 0;
6805 for (i = 0; i < hostnamelen; i++) {
6806 if (hostname[i] == '.')
6807 hasdot++;
6808 }
6809 if (!hasdot)
6810 return NULL;
6811
6812 /* NOTE: hostname may not be NUL-terminated. */
6813 bzero(fqdn, sizeof(fqdn));
6814 bcopy(hostname, fqdn, hostnamelen);
6815 fqdn[hostnamelen] = '\0';
6816 return fqdn;
6817 }
6818
6819 /*
6820 * get username@FQDN for the host/user.
6821 */
6822 static const char *
6823 key_getuserfqdn(void)
6824 {
6825 const char *host;
6826 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2];
6827 struct proc *p = curproc;
6828 char *q;
6829
6830 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session)
6831 return NULL;
6832 if (!(host = key_getfqdn()))
6833 return NULL;
6834
6835 /* NOTE: s_login may not be-NUL terminated. */
6836 bzero(userfqdn, sizeof(userfqdn));
6837 bcopy(p->p_pgrp->pg_session->s_login, userfqdn, MAXLOGNAME);
6838 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */
6839 q = userfqdn + strlen(userfqdn);
6840 *q++ = '@';
6841 bcopy(host, q, strlen(host));
6842 q += strlen(host);
6843 *q++ = '\0';
6844
6845 return userfqdn;
6846 }
6847 #endif
6848
6849 /* record data transfer on SA, and update timestamps */
6850 void
6851 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m)
6852 {
6853 KASSERT(sav != NULL, ("key_sa_recordxfer: Null secasvar"));
6854 KASSERT(m != NULL, ("key_sa_recordxfer: Null mbuf"));
6855 if (!sav->lft_c)
6856 return;
6857
6858 /*
6859 * XXX Currently, there is a difference of bytes size
6860 * between inbound and outbound processing.
6861 */
6862 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len;
6863 /* to check bytes lifetime is done in key_timehandler(). */
6864
6865 /*
6866 * We use the number of packets as the unit of
6867 * sadb_lifetime_allocations. We increment the variable
6868 * whenever {esp,ah}_{in,out}put is called.
6869 */
6870 sav->lft_c->sadb_lifetime_allocations++;
6871 /* XXX check for expires? */
6872
6873 /*
6874 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock,
6875 * in seconds. HARD and SOFT lifetime are measured by the time
6876 * difference (again in seconds) from sadb_lifetime_usetime.
6877 *
6878 * usetime
6879 * v expire expire
6880 * -----+-----+--------+---> t
6881 * <--------------> HARD
6882 * <-----> SOFT
6883 */
6884 sav->lft_c->sadb_lifetime_usetime = time_second;
6885 /* XXX check for expires? */
6886
6887 return;
6888 }
6889
6890 /* dumb version */
6891 void
6892 key_sa_routechange(struct sockaddr *dst)
6893 {
6894 struct secashead *sah;
6895 struct route *ro;
6896
6897 LIST_FOREACH(sah, &sahtree, chain) {
6898 ro = &sah->sa_route;
6899 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len
6900 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) {
6901 RTFREE(ro->ro_rt);
6902 ro->ro_rt = NULL;
6903 }
6904 }
6905
6906 return;
6907 }
6908
6909 static void
6910 key_sa_chgstate(struct secasvar *sav, u_int8_t state)
6911 {
6912 if (sav == NULL)
6913 panic("key_sa_chgstate called with sav == NULL");
6914
6915 if (sav->state == state)
6916 return;
6917
6918 if (__LIST_CHAINED(sav))
6919 LIST_REMOVE(sav, chain);
6920
6921 sav->state = state;
6922 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain);
6923 }
6924
6925 void
6926 key_sa_stir_iv(struct secasvar *sav)
6927 {
6928
6929 if (!sav->iv)
6930 panic("key_sa_stir_iv called with sav == NULL");
6931 key_randomfill(sav->iv, sav->ivlen);
6932 }
6933
6934 /* XXX too much? */
6935 static struct mbuf *
6936 key_alloc_mbuf(int l)
6937 {
6938 struct mbuf *m = NULL, *n;
6939 int len, t;
6940
6941 len = l;
6942 while (len > 0) {
6943 n = m_getb(len, M_NOWAIT, MT_DATA, 0);
6944 if (!n) {
6945 m_freem(m);
6946 return NULL;
6947 }
6948 n->m_len = 0;
6949 n->m_len = M_TRAILINGSPACE(n);
6950 /* use the bottom of mbuf, hoping we can prepend afterwards */
6951 if (n->m_len > len) {
6952 t = (n->m_len - len) & ~(sizeof(long) - 1);
6953 n->m_data += t;
6954 n->m_len = len;
6955 }
6956
6957 len -= n->m_len;
6958
6959 if (m)
6960 m_cat(m, n);
6961 else
6962 m = n;
6963 }
6964
6965 return m;
6966 }
DragonFly BSD