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[netbsd-mini2440.git] / sys / netipsec / ipsec.c
blobc0c461069cfe013d7df49e65c92dc4cf62a34924
1 /* $NetBSD: ipsec.c,v 1.45 2009/06/25 17:39:51 christos Exp $ */
2 /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */
3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.45 2009/06/25 17:39:51 christos Exp $");
36
37 /*
38 * IPsec controller part.
39 */
40
41 #include "opt_inet.h"
42 #ifdef __FreeBSD__
43 #include "opt_inet6.h"
44 #endif
45 #include "opt_ipsec.h"
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51 #include <sys/domain.h>
52 #include <sys/protosw.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/errno.h>
56 #include <sys/time.h>
57 #include <sys/kernel.h>
58 #include <sys/syslog.h>
59 #include <sys/sysctl.h>
60 #include <sys/proc.h>
61 #include <sys/kauth.h>
62
63 #include <net/if.h>
64 #include <net/route.h>
65
66 #include <netinet/in.h>
67 #include <netinet/in_systm.h>
68 #include <netinet/ip.h>
69 #include <netinet/ip_var.h>
70 #include <netinet/in_var.h>
71 #include <netinet/udp.h>
72 #include <netinet/udp_var.h>
73 #include <netinet/tcp.h>
74 #include <netinet/udp.h>
75 #include <netinet/ip_icmp.h>
76
77 #include <netinet/ip6.h>
78 #ifdef INET6
79 #include <netinet6/ip6_var.h>
80 #endif
81 #include <netinet/in_pcb.h>
82 #ifdef INET6
83 #include <netinet6/in6_pcb.h>
84 #include <netinet/icmp6.h>
85 #endif
86
87 #include <netipsec/ipsec.h>
88 #include <netipsec/ipsec_var.h>
89 #include <netipsec/ipsec_private.h>
90 #ifdef INET6
91 #include <netipsec/ipsec6.h>
92 #endif
93 #include <netipsec/ah_var.h>
94 #include <netipsec/esp_var.h>
95 #include <netipsec/ipcomp.h> /*XXX*/
96 #include <netipsec/ipcomp_var.h>
97
98 #include <netipsec/key.h>
99 #include <netipsec/keydb.h>
100 #include <netipsec/key_debug.h>
101
102 #include <netipsec/xform.h>
103
104 #include <netipsec/ipsec_osdep.h>
105
106 #include <net/net_osdep.h>
107
108 #ifdef IPSEC_DEBUG
109 int ipsec_debug = 1;
110
111 /*
112 * When set to 1, IPsec will send packets with the same sequence number.
113 * This allows to verify if the other side has proper replay attacks detection.
114 */
115 int ipsec_replay = 0;
116
117 /*
118 * When set 1, IPsec will send packets with corrupted HMAC.
119 * This allows to verify if the other side properly detects modified packets.
120 */
121 int ipsec_integrity = 0;
122 #else
123 int ipsec_debug = 0;
124 #endif
125
126 percpu_t *ipsecstat_percpu;
127 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
128 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */
129 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
130 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
131 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
132 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
133 struct secpolicy ip4_def_policy;
134 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
135 int ip4_esp_randpad = -1;
136
137 #ifdef __NetBSD__
138 u_int ipsec_spdgen = 1; /* SPD generation # */
139
140 static struct secpolicy *ipsec_checkpcbcache (struct mbuf *,
141 struct inpcbpolicy *, int);
142 static int ipsec_fillpcbcache (struct inpcbpolicy *, struct mbuf *,
143 struct secpolicy *, int);
144 static int ipsec_invalpcbcache (struct inpcbpolicy *, int);
145 #endif /* __NetBSD__ */
146
147 /*
148 * Crypto support requirements:
149 *
150 * 1 require hardware support
151 * -1 require software support
152 * 0 take anything
153 */
154 int crypto_support = 0;
155
156 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int,
157 PCB_T *, int *);
158
159 #ifdef __FreeBSD__
160 SYSCTL_DECL(_net_inet_ipsec);
161
162 /* net.inet.ipsec */
163 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
164 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
165 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
166 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
167 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
168 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
169 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
170 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
171 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
172 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
173 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
174 ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, "");
175 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
176 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
177 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
178 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
179 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
180 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
181 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
182 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
183 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
184 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
185 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
186 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
187 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
188 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
189 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
190 "Emulate replay attack");
191 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
192 &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
193 #endif /* __FreeBSD__ */
194
195 #ifdef INET6
196 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
197 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
198 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
199 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
200 struct secpolicy ip6_def_policy;
201 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
202 int ip6_esp_randpad = -1;
203
204
205 #ifdef __FreeBSD__
206 SYSCTL_DECL(_net_inet6_ipsec6);
207
208 /* net.inet6.ipsec6 */
209 #ifdef COMPAT_KAME
210 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
211 0,0, compat_ipsecstats_sysctl, "S", "");
212 #endif /* COMPAT_KAME */
213 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
214 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
215 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
216 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
217 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
218 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
219 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
220 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
221 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
222 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
223 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
224 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
225 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
226 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
227 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
228 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
229 #endif /* INET6 */
230 #endif /* __FreeBSD__ */
231
232 static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *);
233 #ifdef INET6
234 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *);
235 #endif
236 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
237 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
238 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
239 #ifdef INET6
240 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
241 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
242 #endif
243 static void ipsec_delpcbpolicy (struct inpcbpolicy *);
244 static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *);
245 static int ipsec_set_policy (struct secpolicy **,int , void *, size_t ,
246 kauth_cred_t );
247 static int ipsec_get_policy (struct secpolicy *, struct mbuf **);
248 static void vshiftl (unsigned char *, int, int);
249 static size_t ipsec_hdrsiz (struct secpolicy *);
250
251 #ifdef __NetBSD__
252 /*
253 * Try to validate and use cached policy on a PCB.
254 */
255 static struct secpolicy *
256 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir)
257 {
258 struct secpolicyindex spidx;
259
260 switch (dir) {
261 case IPSEC_DIR_INBOUND:
262 case IPSEC_DIR_OUTBOUND:
263 case IPSEC_DIR_ANY:
264 break;
265 default:
266 return NULL;
267 }
268 #ifdef DIAGNOSTIC
269 if (pcbsp == NULL) {
270 printf("ipsec_checkpcbcache: NULL pcbsp\n");
271 /* XXX panic? */
272 return NULL;
273 }
274 #endif
275
276 #ifdef DIAGNOSTIC
277 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
278 panic("dir too big in ipsec_checkpcbcache");
279 #endif
280 /* SPD table change invalidate all the caches. */
281 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) {
282 ipsec_invalpcbcache(pcbsp, dir);
283 return NULL;
284 }
285 if (!pcbsp->sp_cache[dir].cachesp)
286 return NULL;
287 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) {
288 ipsec_invalpcbcache(pcbsp, dir);
289 return NULL;
290 }
291 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
292 if (!pcbsp->sp_cache[dir].cachesp)
293 return NULL;
294 if (ipsec_setspidx(m, &spidx, 1) != 0)
295 return NULL;
296
297 /*
298 * We have to make an exact match here since the cached rule
299 * might have lower priority than a rule that would otherwise
300 * have matched the packet.
301 */
302
303 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx)))
304 return NULL;
305
306 } else {
307 /*
308 * The pcb is connected, and the L4 code is sure that:
309 * - outgoing side uses inp_[lf]addr
310 * - incoming side looks up policy after inpcb lookup
311 * and address pair is know to be stable. We do not need
312 * to generate spidx again, nor check the address match again.
313 *
314 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds
315 * and there are calls to ipsec_pcbconn() from in_pcbconnect().
316 */
317 }
318
319 pcbsp->sp_cache[dir].cachesp->lastused = time_second;
320 pcbsp->sp_cache[dir].cachesp->refcnt++;
321 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
322 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
323 pcbsp->sp_cache[dir].cachesp->refcnt,
324 pcbsp->sp_cache[dir].cachesp));
325 return pcbsp->sp_cache[dir].cachesp;
326 }
327
328 static int
329 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m,
330 struct secpolicy *sp, int dir)
331 {
332
333 switch (dir) {
334 case IPSEC_DIR_INBOUND:
335 case IPSEC_DIR_OUTBOUND:
336 break;
337 default:
338 return EINVAL;
339 }
340 #ifdef DIAGNOSTIC
341 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
342 panic("dir too big in ipsec_fillpcbcache");
343 #endif
344
345 if (pcbsp->sp_cache[dir].cachesp)
346 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp);
347 pcbsp->sp_cache[dir].cachesp = NULL;
348 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE;
349 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
350 return EINVAL;
351 }
352 pcbsp->sp_cache[dir].cachesp = sp;
353 if (pcbsp->sp_cache[dir].cachesp) {
354 pcbsp->sp_cache[dir].cachesp->refcnt++;
355 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
356 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
357 pcbsp->sp_cache[dir].cachesp->refcnt,
358 pcbsp->sp_cache[dir].cachesp));
359
360 /*
361 * If the PCB is connected, we can remember a hint to
362 * possibly short-circuit IPsec processing in other places.
363 */
364 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) {
365 switch (pcbsp->sp_cache[dir].cachesp->policy) {
366 case IPSEC_POLICY_NONE:
367 case IPSEC_POLICY_BYPASS:
368 pcbsp->sp_cache[dir].cachehint =
369 IPSEC_PCBHINT_NO;
370 break;
371 default:
372 pcbsp->sp_cache[dir].cachehint =
373 IPSEC_PCBHINT_YES;
374 }
375 }
376 }
377 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen;
378
379 return 0;
380 }
381
382 static int
383 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir)
384 {
385 int i;
386
387 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) {
388 if (dir != IPSEC_DIR_ANY && i != dir)
389 continue;
390 if (pcbsp->sp_cache[i].cachesp)
391 KEY_FREESP(&pcbsp->sp_cache[i].cachesp);
392 pcbsp->sp_cache[i].cachesp = NULL;
393 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE;
394 pcbsp->sp_cache[i].cachegen = 0;
395 memset(&pcbsp->sp_cache[i].cacheidx, 0,
396 sizeof(pcbsp->sp_cache[i].cacheidx));
397 }
398 return 0;
399 }
400
401 void
402 ipsec_pcbconn(struct inpcbpolicy *pcbsp)
403 {
404
405 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED;
406 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
407 }
408
409 void
410 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp)
411 {
412
413 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED;
414 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
415 }
416
417 void
418 ipsec_invalpcbcacheall(void)
419 {
420
421 if (ipsec_spdgen == UINT_MAX)
422 ipsec_spdgen = 1;
423 else
424 ipsec_spdgen++;
425 }
426 #endif /* __NetBSD__ */
427
428 /*
429 * Return a held reference to the default SP.
430 */
431 static struct secpolicy *
432 key_allocsp_default(int af, const char* where, int tag)
433 {
434 struct secpolicy *sp;
435
436 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
437 printf("DP key_allocsp_default from %s:%u\n", where, tag));
438
439 switch(af) {
440 case AF_INET:
441 sp = &ip4_def_policy;
442 break;
443 #ifdef INET6
444 case AF_INET6:
445 sp = &ip6_def_policy;
446 break;
447 #endif
448 default:
449 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
450 printf("key_allocsp_default : unexpected protocol family %u\n",
451 af));
452 return NULL;
453 }
454
455 if (sp->policy != IPSEC_POLICY_DISCARD &&
456 sp->policy != IPSEC_POLICY_NONE) {
457 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
458 sp->policy, IPSEC_POLICY_NONE));
459 sp->policy = IPSEC_POLICY_NONE;
460 }
461 sp->refcnt++;
462
463 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
464 printf("DP key_allocsp_default returns SP:%p (%u)\n",
465 sp, sp->refcnt));
466 return sp;
467 }
468 #define KEY_ALLOCSP_DEFAULT(af) \
469 key_allocsp_default((af),__FILE__, __LINE__)
470
471 /*
472 * For OUTBOUND packet having a socket. Searching SPD for packet,
473 * and return a pointer to SP.
474 * OUT: NULL: no apropreate SP found, the following value is set to error.
475 * 0 : bypass
476 * EACCES : discard packet.
477 * ENOENT : ipsec_acquire() in progress, maybe.
478 * others : error occurred.
479 * others: a pointer to SP
480 *
481 * NOTE: IPv6 mapped address concern is implemented here.
482 */
483 struct secpolicy *
484 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
485 {
486 struct secpolicy *sp;
487
488 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
489 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
490 ("ipsec_getpolicy: invalid direction %u", dir));
491
492 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
493 if (sp == NULL) /*XXX????*/
494 sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family);
495 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
496 return sp;
497 }
498
499 /*
500 * For OUTBOUND packet having a socket. Searching SPD for packet,
501 * and return a pointer to SP.
502 * OUT: NULL: no apropreate SP found, the following value is set to error.
503 * 0 : bypass
504 * EACCES : discard packet.
505 * ENOENT : ipsec_acquire() in progress, maybe.
506 * others : error occurred.
507 * others: a pointer to SP
508 *
509 * NOTE: IPv6 mapped address concern is implemented here.
510 */
511 static struct secpolicy *
512 ipsec_getpolicybysock(struct mbuf *m, u_int dir, PCB_T *inp, int *error)
513 {
514 struct inpcbpolicy *pcbsp = NULL;
515 struct secpolicy *currsp = NULL; /* policy on socket */
516 struct secpolicy *sp;
517 int af;
518
519 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
520 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
521 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
522 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
523 ("ipsec_getpolicybysock: invalid direction %u", dir));
524
525 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL,
526 ("ipsec_getppolicybysock: null socket\n"));
527
528 /* XXX FIXME inpcb/in6pcb vs socket*/
529 af = PCB_FAMILY(inp);
530 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
531 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
532
533 #ifdef __NetBSD__
534 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache"));
535 /* If we have a cached entry, and if it is still valid, use it. */
536 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP);
537 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir);
538 if (currsp) {
539 *error = 0;
540 return currsp;
541 }
542 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS);
543 #endif /* __NetBSD__ */
544
545 switch (af) {
546 case AF_INET: {
547 struct inpcb *in4p = PCB_TO_IN4PCB(inp);
548 /* set spidx in pcb */
549 *error = ipsec4_setspidx_inpcb(m, in4p);
550 pcbsp = in4p->inp_sp;
551 break;
552 }
553
554 #if defined(INET6)
555 case AF_INET6: {
556 struct in6pcb *in6p = PCB_TO_IN6PCB(inp);
557 /* set spidx in pcb */
558 *error = ipsec6_setspidx_in6pcb(m, in6p);
559 pcbsp = in6p->in6p_sp;
560 break;
561 }
562 #endif
563 default:
564 *error = EPFNOSUPPORT;
565 break;
566 }
567 if (*error)
568 return NULL;
569
570 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
571 switch (dir) {
572 case IPSEC_DIR_INBOUND:
573 currsp = pcbsp->sp_in;
574 break;
575 case IPSEC_DIR_OUTBOUND:
576 currsp = pcbsp->sp_out;
577 break;
578 }
579 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
580
581 if (pcbsp->priv) { /* when privilieged socket */
582 switch (currsp->policy) {
583 case IPSEC_POLICY_BYPASS:
584 case IPSEC_POLICY_IPSEC:
585 currsp->refcnt++;
586 sp = currsp;
587 break;
588
589 case IPSEC_POLICY_ENTRUST:
590 /* look for a policy in SPD */
591 sp = KEY_ALLOCSP(&currsp->spidx, dir);
592 if (sp == NULL) /* no SP found */
593 sp = KEY_ALLOCSP_DEFAULT(af);
594 break;
595
596 default:
597 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
598 "Invalid policy for PCB %d\n", currsp->policy));
599 *error = EINVAL;
600 return NULL;
601 }
602 } else { /* unpriv, SPD has policy */
603 sp = KEY_ALLOCSP(&currsp->spidx, dir);
604 if (sp == NULL) { /* no SP found */
605 switch (currsp->policy) {
606 case IPSEC_POLICY_BYPASS:
607 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
608 "Illegal policy for non-priviliged defined %d\n",
609 currsp->policy));
610 *error = EINVAL;
611 return NULL;
612
613 case IPSEC_POLICY_ENTRUST:
614 sp = KEY_ALLOCSP_DEFAULT(af);
615 break;
616
617 case IPSEC_POLICY_IPSEC:
618 currsp->refcnt++;
619 sp = currsp;
620 break;
621
622 default:
623 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
624 "Invalid policy for PCB %d\n", currsp->policy));
625 *error = EINVAL;
626 return NULL;
627 }
628 }
629 }
630 IPSEC_ASSERT(sp != NULL,
631 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
632 pcbsp->priv, currsp->policy));
633 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
634 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
635 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
636 sp, sp->refcnt));
637 #ifdef __NetBSD__
638 ipsec_fillpcbcache(pcbsp, m, sp, dir);
639 #endif /* __NetBSD__ */
640 return sp;
641 }
642
643 /*
644 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
645 * and return a pointer to SP.
646 * OUT: positive: a pointer to the entry for security policy leaf matched.
647 * NULL: no apropreate SP found, the following value is set to error.
648 * 0 : bypass
649 * EACCES : discard packet.
650 * ENOENT : ipsec_acquire() in progress, maybe.
651 * others : error occurred.
652 */
653 struct secpolicy *
654 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error)
655 {
656 struct secpolicyindex spidx;
657 struct secpolicy *sp;
658
659 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
660 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
661 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
662 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
663
664 sp = NULL;
665
666 /* Make an index to look for a policy. */
667 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1);
668 if (*error != 0) {
669 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
670 " dir %u flag %u\n", dir, flag));
671 memset(&spidx, 0, sizeof (spidx));
672 return NULL;
673 }
674
675 spidx.dir = dir;
676
677 if (key_havesp(dir)) {
678 sp = KEY_ALLOCSP(&spidx, dir);
679 }
680
681 if (sp == NULL) /* no SP found, use system default */
682 sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family);
683 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
684 return sp;
685 }
686
687 struct secpolicy *
688 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
689 struct inpcb *inp)
690 {
691 struct secpolicy *sp;
692
693 *error = 0;
694
695
696 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
697 if (inp == NULL || inp->inp_socket == NULL) {
698 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
699 } else
700 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error);
701 if (sp == NULL) {
702 IPSEC_ASSERT(*error != 0,
703 ("ipsec4_checkpolicy: getpolicy failed w/o error"));
704 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL);
705 return NULL;
706 }
707 IPSEC_ASSERT(*error == 0,
708 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
709 switch (sp->policy) {
710 case IPSEC_POLICY_ENTRUST:
711 default:
712 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
713 /* fall thru... */
714 case IPSEC_POLICY_DISCARD:
715 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO);
716 *error = -EINVAL; /* packet is discarded by caller */
717 break;
718 case IPSEC_POLICY_BYPASS:
719 case IPSEC_POLICY_NONE:
720 KEY_FREESP(&sp);
721 sp = NULL; /* NB: force NULL result */
722 break;
723 case IPSEC_POLICY_IPSEC:
724 if (sp->req == NULL) /* acquire an SA */
725 *error = key_spdacquire(sp);
726 break;
727 }
728 if (*error != 0) {
729 KEY_FREESP(&sp);
730 sp = NULL;
731 DPRINTF(("%s: done, error %d\n", __func__, *error));
732 }
733 return sp;
734 }
735
736 #ifdef INET6
737 struct secpolicy *
738 ipsec6_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error,
739 struct in6pcb *in6p)
740 {
741 struct secpolicy *sp;
742
743 *error = 0;
744
745
746 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
747 if (in6p == NULL || in6p->in6p_socket == NULL) {
748 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
749 } else
750 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error);
751 if (sp == NULL) {
752 IPSEC_ASSERT(*error != 0,
753 ("ipsec6_checkpolicy: getpolicy failed w/o error"));
754 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL);
755 return NULL;
756 }
757 IPSEC_ASSERT(*error == 0,
758 ("ipsec6_checkpolicy: sp w/ error set to %u", *error));
759 switch (sp->policy) {
760 case IPSEC_POLICY_ENTRUST:
761 default:
762 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy);
763 /* fall thru... */
764 case IPSEC_POLICY_DISCARD:
765 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO);
766 *error = -EINVAL; /* packet is discarded by caller */
767 break;
768 case IPSEC_POLICY_BYPASS:
769 case IPSEC_POLICY_NONE:
770 KEY_FREESP(&sp);
771 sp = NULL; /* NB: force NULL result */
772 break;
773 case IPSEC_POLICY_IPSEC:
774 if (sp->req == NULL) /* acquire an SA */
775 *error = key_spdacquire(sp);
776 break;
777 }
778 if (*error != 0) {
779 KEY_FREESP(&sp);
780 sp = NULL;
781 DPRINTF(("%s: done, error %d\n", __func__, *error));
782 }
783 return sp;
784 }
785 #endif /* INET6 */
786
787 static int
788 ipsec4_setspidx_inpcb(struct mbuf *m ,struct inpcb *pcb)
789 {
790 int error;
791
792 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
793 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
794 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
795 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
796
797 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
798 if (error == 0) {
799 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
800 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
801 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
802 } else {
803 memset(&pcb->inp_sp->sp_in->spidx, 0,
804 sizeof (pcb->inp_sp->sp_in->spidx));
805 memset(&pcb->inp_sp->sp_out->spidx, 0,
806 sizeof (pcb->inp_sp->sp_in->spidx));
807 }
808 return error;
809 }
810
811 #ifdef INET6
812 static int
813 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb)
814 {
815 struct secpolicyindex *spidx;
816 int error;
817
818 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
819 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
820 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
821 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
822
823 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx));
824 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx));
825
826 spidx = &pcb->in6p_sp->sp_in->spidx;
827 error = ipsec_setspidx(m, spidx, 1);
828 if (error)
829 goto bad;
830 spidx->dir = IPSEC_DIR_INBOUND;
831
832 spidx = &pcb->in6p_sp->sp_out->spidx;
833 error = ipsec_setspidx(m, spidx, 1);
834 if (error)
835 goto bad;
836 spidx->dir = IPSEC_DIR_OUTBOUND;
837
838 return 0;
839
840 bad:
841 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx));
842 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx));
843 return error;
844 }
845 #endif
846
847 /*
848 * configure security policy index (src/dst/proto/sport/dport)
849 * by looking at the content of mbuf.
850 * the caller is responsible for error recovery (like clearing up spidx).
851 */
852 static int
853 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport)
854 {
855 struct ip *ip = NULL;
856 struct ip ipbuf;
857 u_int v;
858 struct mbuf *n;
859 int len;
860 int error;
861
862 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
863
864 /*
865 * validate m->m_pkthdr.len. we see incorrect length if we
866 * mistakenly call this function with inconsistent mbuf chain
867 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
868 */
869 len = 0;
870 for (n = m; n; n = n->m_next)
871 len += n->m_len;
872 if (m->m_pkthdr.len != len) {
873 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
874 printf("ipsec_setspidx: "
875 "total of m_len(%d) != pkthdr.len(%d), "
876 "ignored.\n",
877 len, m->m_pkthdr.len));
878 return EINVAL;
879 }
880
881 if (m->m_pkthdr.len < sizeof(struct ip)) {
882 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
883 printf("ipsec_setspidx: "
884 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
885 m->m_pkthdr.len));
886 return EINVAL;
887 }
888
889 if (m->m_len >= sizeof(*ip))
890 ip = mtod(m, struct ip *);
891 else {
892 m_copydata(m, 0, sizeof(ipbuf), &ipbuf);
893 ip = &ipbuf;
894 }
895 v = ip->ip_v;
896 switch (v) {
897 case 4:
898 error = ipsec4_setspidx_ipaddr(m, spidx);
899 if (error)
900 return error;
901 ipsec4_get_ulp(m, spidx, needport);
902 return 0;
903 #ifdef INET6
904 case 6:
905 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
906 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
907 printf("ipsec_setspidx: "
908 "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
909 "ignored.\n", m->m_pkthdr.len));
910 return EINVAL;
911 }
912 error = ipsec6_setspidx_ipaddr(m, spidx);
913 if (error)
914 return error;
915 ipsec6_get_ulp(m, spidx, needport);
916 return 0;
917 #endif
918 default:
919 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
920 printf("ipsec_setspidx: "
921 "unknown IP version %u, ignored.\n", v));
922 return EINVAL;
923 }
924 }
925
926 static void
927 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
928 {
929 u_int8_t nxt;
930 int off;
931
932 /* sanity check */
933 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
934 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),
935 ("ipsec4_get_ulp: packet too short"));
936
937 /* NB: ip_input() flips it into host endian XXX need more checking */
938 if (m->m_len >= sizeof(struct ip)) {
939 struct ip *ip = mtod(m, struct ip *);
940 if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
941 goto done;
942 off = ip->ip_hl << 2;
943 nxt = ip->ip_p;
944 } else {
945 struct ip ih;
946
947 m_copydata(m, 0, sizeof (struct ip), &ih);
948 if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
949 goto done;
950 off = ih.ip_hl << 2;
951 nxt = ih.ip_p;
952 }
953
954 while (off < m->m_pkthdr.len) {
955 struct ip6_ext ip6e;
956 struct tcphdr th;
957 struct udphdr uh;
958 struct icmp icmph;
959
960 switch (nxt) {
961 case IPPROTO_TCP:
962 spidx->ul_proto = nxt;
963 if (!needport)
964 goto done_proto;
965 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
966 goto done;
967 m_copydata(m, off, sizeof (th), &th);
968 spidx->src.sin.sin_port = th.th_sport;
969 spidx->dst.sin.sin_port = th.th_dport;
970 return;
971 case IPPROTO_UDP:
972 spidx->ul_proto = nxt;
973 if (!needport)
974 goto done_proto;
975 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
976 goto done;
977 m_copydata(m, off, sizeof (uh), &uh);
978 spidx->src.sin.sin_port = uh.uh_sport;
979 spidx->dst.sin.sin_port = uh.uh_dport;
980 return;
981 case IPPROTO_AH:
982 if (m->m_pkthdr.len > off + sizeof(ip6e))
983 goto done;
984 /* XXX sigh, this works but is totally bogus */
985 m_copydata(m, off, sizeof(ip6e), &ip6e);
986 off += (ip6e.ip6e_len + 2) << 2;
987 nxt = ip6e.ip6e_nxt;
988 break;
989 case IPPROTO_ICMP:
990 spidx->ul_proto = nxt;
991 if (off + sizeof(struct icmp) > m->m_pkthdr.len)
992 return;
993 m_copydata(m, off, sizeof(icmph), &icmph);
994 ((struct sockaddr_in *)&spidx->src)->sin_port =
995 htons((uint16_t)icmph.icmp_type);
996 ((struct sockaddr_in *)&spidx->dst)->sin_port =
997 htons((uint16_t)icmph.icmp_code);
998 return;
999 default:
1000 /* XXX intermediate headers??? */
1001 spidx->ul_proto = nxt;
1002 goto done_proto;
1003 }
1004 }
1005 done:
1006 spidx->ul_proto = IPSEC_ULPROTO_ANY;
1007 done_proto:
1008 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
1009 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
1010 }
1011
1012 /* assumes that m is sane */
1013 static int
1014 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
1015 {
1016 static const struct sockaddr_in template = {
1017 sizeof (struct sockaddr_in),
1018 AF_INET,
1019 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
1020 };
1021
1022 spidx->src.sin = template;
1023 spidx->dst.sin = template;
1024
1025 if (m->m_len < sizeof (struct ip)) {
1026 m_copydata(m, offsetof(struct ip, ip_src),
1027 sizeof (struct in_addr),
1028 &spidx->src.sin.sin_addr);
1029 m_copydata(m, offsetof(struct ip, ip_dst),
1030 sizeof (struct in_addr),
1031 &spidx->dst.sin.sin_addr);
1032 } else {
1033 struct ip *ip = mtod(m, struct ip *);
1034 spidx->src.sin.sin_addr = ip->ip_src;
1035 spidx->dst.sin.sin_addr = ip->ip_dst;
1036 }
1037
1038 spidx->prefs = sizeof(struct in_addr) << 3;
1039 spidx->prefd = sizeof(struct in_addr) << 3;
1040
1041 return 0;
1042 }
1043
1044 #ifdef INET6
1045 static void
1046 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx,
1047 int needport)
1048 {
1049 int off, nxt;
1050 struct tcphdr th;
1051 struct udphdr uh;
1052 struct icmp6_hdr icmph;
1053
1054 /* sanity check */
1055 if (m == NULL)
1056 panic("ipsec6_get_ulp: NULL pointer was passed");
1057
1058 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1059 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
1060
1061 /* set default */
1062 spidx->ul_proto = IPSEC_ULPROTO_ANY;
1063 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
1064 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
1065
1066 nxt = -1;
1067 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
1068 if (off < 0 || m->m_pkthdr.len < off)
1069 return;
1070
1071 switch (nxt) {
1072 case IPPROTO_TCP:
1073 spidx->ul_proto = nxt;
1074 if (!needport)
1075 break;
1076 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
1077 break;
1078 m_copydata(m, off, sizeof(th), &th);
1079 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
1080 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
1081 break;
1082 case IPPROTO_UDP:
1083 spidx->ul_proto = nxt;
1084 if (!needport)
1085 break;
1086 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
1087 break;
1088 m_copydata(m, off, sizeof(uh), &uh);
1089 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
1090 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
1091 break;
1092 case IPPROTO_ICMPV6:
1093 spidx->ul_proto = nxt;
1094 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
1095 break;
1096 m_copydata(m, off, sizeof(icmph), &icmph);
1097 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
1098 htons((uint16_t)icmph.icmp6_type);
1099 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
1100 htons((uint16_t)icmph.icmp6_code);
1101 break;
1102 default:
1103 /* XXX intermediate headers??? */
1104 spidx->ul_proto = nxt;
1105 break;
1106 }
1107 }
1108
1109 /* assumes that m is sane */
1110 static int
1111 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
1112 {
1113 struct ip6_hdr *ip6 = NULL;
1114 struct ip6_hdr ip6buf;
1115 struct sockaddr_in6 *sin6;
1116
1117 if (m->m_len >= sizeof(*ip6))
1118 ip6 = mtod(m, struct ip6_hdr *);
1119 else {
1120 m_copydata(m, 0, sizeof(ip6buf), &ip6buf);
1121 ip6 = &ip6buf;
1122 }
1123
1124 sin6 = (struct sockaddr_in6 *)&spidx->src;
1125 memset(sin6, 0, sizeof(*sin6));
1126 sin6->sin6_family = AF_INET6;
1127 sin6->sin6_len = sizeof(struct sockaddr_in6);
1128 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src));
1129 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
1130 sin6->sin6_addr.s6_addr16[1] = 0;
1131 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
1132 }
1133 spidx->prefs = sizeof(struct in6_addr) << 3;
1134
1135 sin6 = (struct sockaddr_in6 *)&spidx->dst;
1136 memset(sin6, 0, sizeof(*sin6));
1137 sin6->sin6_family = AF_INET6;
1138 sin6->sin6_len = sizeof(struct sockaddr_in6);
1139 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst));
1140 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
1141 sin6->sin6_addr.s6_addr16[1] = 0;
1142 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
1143 }
1144 spidx->prefd = sizeof(struct in6_addr) << 3;
1145
1146 return 0;
1147 }
1148 #endif
1149
1150 static void
1151 ipsec_delpcbpolicy(struct inpcbpolicy *p)
1152 {
1153 free(p, M_SECA);
1154 }
1155
1156 /* initialize policy in PCB */
1157 int
1158 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp)
1159 {
1160 struct inpcbpolicy *new;
1161
1162 /* sanity check. */
1163 if (so == NULL || pcb_sp == NULL)
1164 panic("ipsec_init_policy: NULL pointer was passed");
1165
1166 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
1167 M_SECA, M_NOWAIT|M_ZERO);
1168 if (new == NULL) {
1169 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
1170 return ENOBUFS;
1171 }
1172
1173 if (IPSEC_PRIVILEGED_SO(so))
1174 new->priv = 1;
1175 else
1176 new->priv = 0;
1177
1178 if ((new->sp_in = KEY_NEWSP()) == NULL) {
1179 ipsec_delpcbpolicy(new);
1180 return ENOBUFS;
1181 }
1182 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
1183 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
1184
1185 if ((new->sp_out = KEY_NEWSP()) == NULL) {
1186 KEY_FREESP(&new->sp_in);
1187 ipsec_delpcbpolicy(new);
1188 return ENOBUFS;
1189 }
1190 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
1191 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
1192
1193 *pcb_sp = new;
1194
1195 return 0;
1196 }
1197
1198 /* copy old ipsec policy into new */
1199 int
1200 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new)
1201 {
1202 struct secpolicy *sp;
1203
1204 sp = ipsec_deepcopy_policy(old->sp_in);
1205 if (sp) {
1206 KEY_FREESP(&new->sp_in);
1207 new->sp_in = sp;
1208 } else
1209 return ENOBUFS;
1210
1211 sp = ipsec_deepcopy_policy(old->sp_out);
1212 if (sp) {
1213 KEY_FREESP(&new->sp_out);
1214 new->sp_out = sp;
1215 } else
1216 return ENOBUFS;
1217
1218 new->priv = old->priv;
1219
1220 return 0;
1221 }
1222
1223 /* deep-copy a policy in PCB */
1224 static struct secpolicy *
1225 ipsec_deepcopy_policy(struct secpolicy *src)
1226 {
1227 struct ipsecrequest *newchain = NULL;
1228 struct ipsecrequest *p;
1229 struct ipsecrequest **q;
1230 struct ipsecrequest *r;
1231 struct secpolicy *dst;
1232
1233 if (src == NULL)
1234 return NULL;
1235 dst = KEY_NEWSP();
1236 if (dst == NULL)
1237 return NULL;
1238
1239 /*
1240 * deep-copy IPsec request chain. This is required since struct
1241 * ipsecrequest is not reference counted.
1242 */
1243 q = &newchain;
1244 for (p = src->req; p; p = p->next) {
1245 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
1246 M_SECA, M_NOWAIT);
1247 if (*q == NULL)
1248 goto fail;
1249 memset(*q, 0, sizeof(**q));
1250 (*q)->next = NULL;
1251
1252 (*q)->saidx.proto = p->saidx.proto;
1253 (*q)->saidx.mode = p->saidx.mode;
1254 (*q)->level = p->level;
1255 (*q)->saidx.reqid = p->saidx.reqid;
1256
1257 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src));
1258 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst));
1259
1260 (*q)->sav = NULL;
1261 (*q)->sp = dst;
1262
1263 q = &((*q)->next);
1264 }
1265
1266 dst->req = newchain;
1267 dst->state = src->state;
1268 dst->policy = src->policy;
1269 /* do not touch the refcnt fields */
1270
1271 return dst;
1272
1273 fail:
1274 for (p = newchain; p; p = r) {
1275 r = p->next;
1276 free(p, M_SECA);
1277 p = NULL;
1278 }
1279 return NULL;
1280 }
1281
1282 /* set policy and ipsec request if present. */
1283 static int
1284 ipsec_set_policy(
1285 struct secpolicy **pcb_sp,
1286 int optname,
1287 void *request,
1288 size_t len,
1289 kauth_cred_t cred
1290 )
1291 {
1292 struct sadb_x_policy *xpl;
1293 struct secpolicy *newsp = NULL;
1294 int error;
1295
1296 /* sanity check. */
1297 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1298 return EINVAL;
1299 if (len < sizeof(*xpl))
1300 return EINVAL;
1301 xpl = (struct sadb_x_policy *)request;
1302
1303 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1304 printf("ipsec_set_policy: passed policy\n");
1305 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1306
1307 /* check policy type */
1308 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1309 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1310 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1311 return EINVAL;
1312
1313 /* check privileged socket */
1314 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1315 error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER,
1316 NULL);
1317 if (error)
1318 return (error);
1319 }
1320
1321 /* allocation new SP entry */
1322 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1323 return error;
1324
1325 newsp->state = IPSEC_SPSTATE_ALIVE;
1326
1327 /* clear old SP and set new SP */
1328 KEY_FREESP(pcb_sp);
1329 *pcb_sp = newsp;
1330 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1331 printf("ipsec_set_policy: new policy\n");
1332 kdebug_secpolicy(newsp));
1333
1334 return 0;
1335 }
1336
1337 static int
1338 ipsec_get_policy(struct secpolicy *pcb_sp, struct mbuf **mp)
1339 {
1340
1341 /* sanity check. */
1342 if (pcb_sp == NULL || mp == NULL)
1343 return EINVAL;
1344
1345 *mp = key_sp2msg(pcb_sp);
1346 if (!*mp) {
1347 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1348 return ENOBUFS;
1349 }
1350
1351 (*mp)->m_type = MT_DATA;
1352 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1353 printf("ipsec_get_policy:\n");
1354 kdebug_mbuf(*mp));
1355
1356 return 0;
1357 }
1358
1359 int
1360 ipsec4_set_policy(struct inpcb *inp, int optname ,void *request,
1361 size_t len, kauth_cred_t cred)
1362 {
1363 struct sadb_x_policy *xpl;
1364 struct secpolicy **pcb_sp;
1365
1366 /* sanity check. */
1367 if (inp == NULL || request == NULL)
1368 return EINVAL;
1369 if (len < sizeof(*xpl))
1370 return EINVAL;
1371 xpl = (struct sadb_x_policy *)request;
1372
1373 IPSEC_ASSERT(inp->inp_sp != NULL,
1374 ("ipsec4_set_policy(): null inp->in_sp"));
1375
1376 /* select direction */
1377 switch (xpl->sadb_x_policy_dir) {
1378 case IPSEC_DIR_INBOUND:
1379 pcb_sp = &inp->inp_sp->sp_in;
1380 break;
1381 case IPSEC_DIR_OUTBOUND:
1382 pcb_sp = &inp->inp_sp->sp_out;
1383 break;
1384 default:
1385 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1386 xpl->sadb_x_policy_dir));
1387 return EINVAL;
1388 }
1389
1390 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1391 }
1392
1393 int
1394 ipsec4_get_policy(struct inpcb *inp, void *request, size_t len,
1395 struct mbuf **mp)
1396 {
1397 struct sadb_x_policy *xpl;
1398 struct secpolicy *pcb_sp;
1399
1400 /* sanity check. */
1401 if (inp == NULL || request == NULL || mp == NULL)
1402 return EINVAL;
1403 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1404 if (len < sizeof(*xpl))
1405 return EINVAL;
1406 xpl = (struct sadb_x_policy *)request;
1407
1408 /* select direction */
1409 switch (xpl->sadb_x_policy_dir) {
1410 case IPSEC_DIR_INBOUND:
1411 pcb_sp = inp->inp_sp->sp_in;
1412 break;
1413 case IPSEC_DIR_OUTBOUND:
1414 pcb_sp = inp->inp_sp->sp_out;
1415 break;
1416 default:
1417 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1418 xpl->sadb_x_policy_dir));
1419 return EINVAL;
1420 }
1421
1422 return ipsec_get_policy(pcb_sp, mp);
1423 }
1424
1425 /* delete policy in PCB */
1426 int
1427 ipsec4_delete_pcbpolicy(struct inpcb *inp)
1428 {
1429 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1430
1431 if (inp->inp_sp == NULL)
1432 return 0;
1433
1434 if (inp->inp_sp->sp_in != NULL)
1435 KEY_FREESP(&inp->inp_sp->sp_in);
1436
1437 if (inp->inp_sp->sp_out != NULL)
1438 KEY_FREESP(&inp->inp_sp->sp_out);
1439
1440 ipsec_delpcbpolicy(inp->inp_sp);
1441 inp->inp_sp = NULL;
1442
1443 return 0;
1444 }
1445
1446 #ifdef INET6
1447 int
1448 ipsec6_set_policy(struct in6pcb *in6p, int optname, void *request,
1449 size_t len, kauth_cred_t cred)
1450 {
1451 struct sadb_x_policy *xpl;
1452 struct secpolicy **pcb_sp;
1453
1454 /* sanity check. */
1455 if (in6p == NULL || request == NULL)
1456 return EINVAL;
1457 if (len < sizeof(*xpl))
1458 return EINVAL;
1459 xpl = (struct sadb_x_policy *)request;
1460
1461 /* select direction */
1462 switch (xpl->sadb_x_policy_dir) {
1463 case IPSEC_DIR_INBOUND:
1464 pcb_sp = &in6p->in6p_sp->sp_in;
1465 break;
1466 case IPSEC_DIR_OUTBOUND:
1467 pcb_sp = &in6p->in6p_sp->sp_out;
1468 break;
1469 default:
1470 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1471 xpl->sadb_x_policy_dir));
1472 return EINVAL;
1473 }
1474
1475 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1476 }
1477
1478 int
1479 ipsec6_get_policy(struct in6pcb *in6p, void *request, size_t len,
1480 struct mbuf **mp)
1481 {
1482 struct sadb_x_policy *xpl;
1483 struct secpolicy *pcb_sp;
1484
1485 /* sanity check. */
1486 if (in6p == NULL || request == NULL || mp == NULL)
1487 return EINVAL;
1488 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1489 if (len < sizeof(*xpl))
1490 return EINVAL;
1491 xpl = (struct sadb_x_policy *)request;
1492
1493 /* select direction */
1494 switch (xpl->sadb_x_policy_dir) {
1495 case IPSEC_DIR_INBOUND:
1496 pcb_sp = in6p->in6p_sp->sp_in;
1497 break;
1498 case IPSEC_DIR_OUTBOUND:
1499 pcb_sp = in6p->in6p_sp->sp_out;
1500 break;
1501 default:
1502 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1503 xpl->sadb_x_policy_dir));
1504 return EINVAL;
1505 }
1506
1507 return ipsec_get_policy(pcb_sp, mp);
1508 }
1509
1510 int
1511 ipsec6_delete_pcbpolicy(struct in6pcb *in6p)
1512 {
1513 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1514
1515 if (in6p->in6p_sp == NULL)
1516 return 0;
1517
1518 if (in6p->in6p_sp->sp_in != NULL)
1519 KEY_FREESP(&in6p->in6p_sp->sp_in);
1520
1521 if (in6p->in6p_sp->sp_out != NULL)
1522 KEY_FREESP(&in6p->in6p_sp->sp_out);
1523
1524 ipsec_delpcbpolicy(in6p->in6p_sp);
1525 in6p->in6p_sp = NULL;
1526
1527 return 0;
1528 }
1529 #endif
1530
1531 /*
1532 * return current level.
1533 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1534 */
1535 u_int
1536 ipsec_get_reqlevel(struct ipsecrequest *isr)
1537 {
1538 u_int level = 0;
1539 u_int esp_trans_deflev, esp_net_deflev;
1540 u_int ah_trans_deflev, ah_net_deflev;
1541
1542 IPSEC_ASSERT(isr != NULL && isr->sp != NULL,
1543 ("ipsec_get_reqlevel: null argument"));
1544 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1545 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1546 isr->sp->spidx.src.sa.sa_family,
1547 isr->sp->spidx.dst.sa.sa_family));
1548
1549 /* XXX note that we have ipseclog() expanded here - code sync issue */
1550 #define IPSEC_CHECK_DEFAULT(lev) \
1551 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1552 && (lev) != IPSEC_LEVEL_UNIQUE) \
1553 ? (ipsec_debug \
1554 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1555 (lev), IPSEC_LEVEL_REQUIRE) \
1556 : 0), \
1557 (lev) = IPSEC_LEVEL_REQUIRE, \
1558 (lev) \
1559 : (lev))
1560
1561 /* set default level */
1562 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1563 #ifdef INET
1564 case AF_INET:
1565 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1566 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1567 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1568 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1569 break;
1570 #endif
1571 #ifdef INET6
1572 case AF_INET6:
1573 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1574 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1575 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1576 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1577 break;
1578 #endif /* INET6 */
1579 default:
1580 panic("key_get_reqlevel: unknown af %u",
1581 isr->sp->spidx.src.sa.sa_family);
1582 }
1583
1584 #undef IPSEC_CHECK_DEFAULT
1585
1586 /* set level */
1587 switch (isr->level) {
1588 case IPSEC_LEVEL_DEFAULT:
1589 switch (isr->saidx.proto) {
1590 case IPPROTO_ESP:
1591 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1592 level = esp_net_deflev;
1593 else
1594 level = esp_trans_deflev;
1595 break;
1596 case IPPROTO_AH:
1597 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1598 level = ah_net_deflev;
1599 else
1600 level = ah_trans_deflev;
1601 break;
1602 case IPPROTO_IPCOMP:
1603 /*
1604 * we don't really care, as IPcomp document says that
1605 * we shouldn't compress small packets
1606 */
1607 level = IPSEC_LEVEL_USE;
1608 break;
1609 default:
1610 panic("ipsec_get_reqlevel: Illegal protocol defined %u",
1611 isr->saidx.proto);
1612 }
1613 break;
1614
1615 case IPSEC_LEVEL_USE:
1616 case IPSEC_LEVEL_REQUIRE:
1617 level = isr->level;
1618 break;
1619 case IPSEC_LEVEL_UNIQUE:
1620 level = IPSEC_LEVEL_REQUIRE;
1621 break;
1622
1623 default:
1624 panic("ipsec_get_reqlevel: Illegal IPsec level %u",
1625 isr->level);
1626 }
1627
1628 return level;
1629 }
1630
1631 /*
1632 * Check security policy requirements against the actual
1633 * packet contents. Return one if the packet should be
1634 * reject as "invalid"; otherwiser return zero to have the
1635 * packet treated as "valid".
1636 *
1637 * OUT:
1638 * 0: valid
1639 * 1: invalid
1640 */
1641 int
1642 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1643 {
1644 struct ipsecrequest *isr;
1645 int need_auth;
1646
1647 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1648 printf("ipsec_in_reject: using SP\n");
1649 kdebug_secpolicy(sp));
1650
1651 /* check policy */
1652 switch (sp->policy) {
1653 case IPSEC_POLICY_DISCARD:
1654 return 1;
1655 case IPSEC_POLICY_BYPASS:
1656 case IPSEC_POLICY_NONE:
1657 return 0;
1658 }
1659
1660 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1661 ("ipsec_in_reject: invalid policy %u", sp->policy));
1662
1663 /* XXX should compare policy against ipsec header history */
1664
1665 need_auth = 0;
1666 for (isr = sp->req; isr != NULL; isr = isr->next) {
1667 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1668 continue;
1669 switch (isr->saidx.proto) {
1670 case IPPROTO_ESP:
1671 if ((m->m_flags & M_DECRYPTED) == 0) {
1672 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1673 printf("ipsec_in_reject: ESP m_flags:%x\n",
1674 m->m_flags));
1675 return 1;
1676 }
1677
1678 if (!need_auth &&
1679 isr->sav != NULL &&
1680 isr->sav->tdb_authalgxform != NULL &&
1681 (m->m_flags & M_AUTHIPDGM) == 0) {
1682 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1683 printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1684 m->m_flags));
1685 return 1;
1686 }
1687 break;
1688 case IPPROTO_AH:
1689 need_auth = 1;
1690 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1691 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1692 printf("ipsec_in_reject: AH m_flags:%x\n",
1693 m->m_flags));
1694 return 1;
1695 }
1696 break;
1697 case IPPROTO_IPCOMP:
1698 /*
1699 * we don't really care, as IPcomp document
1700 * says that we shouldn't compress small
1701 * packets, IPComp policy should always be
1702 * treated as being in "use" level.
1703 */
1704 break;
1705 }
1706 }
1707 return 0; /* valid */
1708 }
1709
1710 /*
1711 * Check AH/ESP integrity.
1712 * This function is called from tcp_input(), udp_input(),
1713 * and {ah,esp}4_input for tunnel mode
1714 */
1715 int
1716 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp)
1717 {
1718 struct secpolicy *sp;
1719 int error;
1720 int result;
1721
1722 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1723
1724 /* get SP for this packet.
1725 * When we are called from ip_forward(), we call
1726 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1727 */
1728 if (inp == NULL)
1729 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1730 else
1731 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1732 IN4PCB_TO_PCB(inp), &error);
1733
1734 if (sp != NULL) {
1735 result = ipsec_in_reject(sp, m);
1736 if (result)
1737 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1738 KEY_FREESP(&sp);
1739 } else {
1740 result = 0; /* XXX should be panic ?
1741 * -> No, there may be error. */
1742 }
1743 return result;
1744 }
1745
1746
1747 #ifdef INET6
1748 /*
1749 * Check AH/ESP integrity.
1750 * This function is called from tcp6_input(), udp6_input(),
1751 * and {ah,esp}6_input for tunnel mode
1752 */
1753 int
1754 ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p)
1755 {
1756 struct secpolicy *sp = NULL;
1757 int error;
1758 int result;
1759
1760 /* sanity check */
1761 if (m == NULL)
1762 return 0; /* XXX should be panic ? */
1763
1764 /* get SP for this packet.
1765 * When we are called from ip_forward(), we call
1766 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1767 */
1768 if (in6p == NULL)
1769 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1770 else
1771 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1772 IN6PCB_TO_PCB(in6p),
1773 &error);
1774
1775 if (sp != NULL) {
1776 result = ipsec_in_reject(sp, m);
1777 if (result)
1778 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
1779 KEY_FREESP(&sp);
1780 } else {
1781 result = 0;
1782 }
1783 return result;
1784 }
1785 #endif
1786
1787 /*
1788 * compute the byte size to be occupied by IPsec header.
1789 * in case it is tunneled, it includes the size of outer IP header.
1790 * NOTE: SP passed is free in this function.
1791 */
1792 static size_t
1793 ipsec_hdrsiz(struct secpolicy *sp)
1794 {
1795 struct ipsecrequest *isr;
1796 size_t siz;
1797
1798 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1799 printf("ipsec_hdrsiz: using SP\n");
1800 kdebug_secpolicy(sp));
1801
1802 switch (sp->policy) {
1803 case IPSEC_POLICY_DISCARD:
1804 case IPSEC_POLICY_BYPASS:
1805 case IPSEC_POLICY_NONE:
1806 return 0;
1807 }
1808
1809 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1810 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1811
1812 siz = 0;
1813 for (isr = sp->req; isr != NULL; isr = isr->next) {
1814 size_t clen = 0;
1815
1816 switch (isr->saidx.proto) {
1817 case IPPROTO_ESP:
1818 clen = esp_hdrsiz(isr->sav);
1819 break;
1820 case IPPROTO_AH:
1821 clen = ah_hdrsiz(isr->sav);
1822 break;
1823 case IPPROTO_IPCOMP:
1824 clen = sizeof(struct ipcomp);
1825 break;
1826 }
1827
1828 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1829 switch (isr->saidx.dst.sa.sa_family) {
1830 case AF_INET:
1831 clen += sizeof(struct ip);
1832 break;
1833 #ifdef INET6
1834 case AF_INET6:
1835 clen += sizeof(struct ip6_hdr);
1836 break;
1837 #endif
1838 default:
1839 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1840 "unknown AF %d in IPsec tunnel SA\n",
1841 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1842 break;
1843 }
1844 }
1845 siz += clen;
1846 }
1847
1848 return siz;
1849 }
1850
1851 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1852 size_t
1853 ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp)
1854 {
1855 struct secpolicy *sp;
1856 int error;
1857 size_t size;
1858
1859 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1860 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL,
1861 ("ipsec4_hdrsize: socket w/o inpcb"));
1862
1863 /* get SP for this packet.
1864 * When we are called from ip_forward(), we call
1865 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1866 */
1867 if (inp == NULL)
1868 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1869 else
1870 sp = ipsec_getpolicybysock(m, dir,
1871 IN4PCB_TO_PCB(inp), &error);
1872
1873 if (sp != NULL) {
1874 size = ipsec_hdrsiz(sp);
1875 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1876 printf("ipsec4_hdrsiz: size:%lu.\n",
1877 (unsigned long)size));
1878
1879 KEY_FREESP(&sp);
1880 } else {
1881 size = 0; /* XXX should be panic ? */
1882 }
1883 return size;
1884 }
1885
1886 #ifdef INET6
1887 /* This function is called from ipsec6_hdrsize_tcp(),
1888 * and maybe from ip6_forward.()
1889 */
1890 size_t
1891 ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p)
1892 {
1893 struct secpolicy *sp;
1894 int error;
1895 size_t size;
1896
1897 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1898 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1899 ("ipsec6_hdrsize: socket w/o inpcb"));
1900
1901 /* get SP for this packet */
1902 /* XXX Is it right to call with IP_FORWARDING. */
1903 if (in6p == NULL)
1904 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1905 else
1906 sp = ipsec_getpolicybysock(m, dir,
1907 IN6PCB_TO_PCB(in6p),
1908 &error);
1909
1910 if (sp == NULL)
1911 return 0;
1912 size = ipsec_hdrsiz(sp);
1913 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1914 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1915 KEY_FREESP(&sp);
1916
1917 return size;
1918 }
1919 #endif /*INET6*/
1920
1921 /*
1922 * Check the variable replay window.
1923 * ipsec_chkreplay() performs replay check before ICV verification.
1924 * ipsec_updatereplay() updates replay bitmap. This must be called after
1925 * ICV verification (it also performs replay check, which is usually done
1926 * beforehand).
1927 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1928 *
1929 * based on RFC 2401.
1930 */
1931 int
1932 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav)
1933 {
1934 const struct secreplay *replay;
1935 u_int32_t diff;
1936 int fr;
1937 u_int32_t wsizeb; /* constant: bits of window size */
1938 int frlast; /* constant: last frame */
1939
1940 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay");
1941
1942 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1943 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1944
1945 replay = sav->replay;
1946
1947 if (replay->wsize == 0)
1948 return 1; /* no need to check replay. */
1949
1950 /* constant */
1951 frlast = replay->wsize - 1;
1952 wsizeb = replay->wsize << 3;
1953
1954 /* sequence number of 0 is invalid */
1955 if (seq == 0)
1956 return 0;
1957
1958 /* first time is always okay */
1959 if (replay->count == 0)
1960 return 1;
1961
1962 if (seq > replay->lastseq) {
1963 /* larger sequences are okay */
1964 return 1;
1965 } else {
1966 /* seq is equal or less than lastseq. */
1967 diff = replay->lastseq - seq;
1968
1969 /* over range to check, i.e. too old or wrapped */
1970 if (diff >= wsizeb)
1971 return 0;
1972
1973 fr = frlast - diff / 8;
1974
1975 /* this packet already seen ? */
1976 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1977 return 0;
1978
1979 /* out of order but good */
1980 return 1;
1981 }
1982 }
1983
1984 /*
1985 * check replay counter whether to update or not.
1986 * OUT: 0: OK
1987 * 1: NG
1988 */
1989 int
1990 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav)
1991 {
1992 struct secreplay *replay;
1993 u_int32_t diff;
1994 int fr;
1995 u_int32_t wsizeb; /* constant: bits of window size */
1996 int frlast; /* constant: last frame */
1997
1998 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay");
1999
2000 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
2001 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
2002
2003 replay = sav->replay;
2004
2005 if (replay->wsize == 0)
2006 goto ok; /* no need to check replay. */
2007
2008 /* constant */
2009 frlast = replay->wsize - 1;
2010 wsizeb = replay->wsize << 3;
2011
2012 /* sequence number of 0 is invalid */
2013 if (seq == 0)
2014 return 1;
2015
2016 /* first time */
2017 if (replay->count == 0) {
2018 replay->lastseq = seq;
2019 memset(replay->bitmap, 0, replay->wsize);
2020 (replay->bitmap)[frlast] = 1;
2021 goto ok;
2022 }
2023
2024 if (seq > replay->lastseq) {
2025 /* seq is larger than lastseq. */
2026 diff = seq - replay->lastseq;
2027
2028 /* new larger sequence number */
2029 if (diff < wsizeb) {
2030 /* In window */
2031 /* set bit for this packet */
2032 vshiftl(replay->bitmap, diff, replay->wsize);
2033 (replay->bitmap)[frlast] |= 1;
2034 } else {
2035 /* this packet has a "way larger" */
2036 memset(replay->bitmap, 0, replay->wsize);
2037 (replay->bitmap)[frlast] = 1;
2038 }
2039 replay->lastseq = seq;
2040
2041 /* larger is good */
2042 } else {
2043 /* seq is equal or less than lastseq. */
2044 diff = replay->lastseq - seq;
2045
2046 /* over range to check, i.e. too old or wrapped */
2047 if (diff >= wsizeb)
2048 return 1;
2049
2050 fr = frlast - diff / 8;
2051
2052 /* this packet already seen ? */
2053 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2054 return 1;
2055
2056 /* mark as seen */
2057 (replay->bitmap)[fr] |= (1 << (diff % 8));
2058
2059 /* out of order but good */
2060 }
2061
2062 ok:
2063 if (replay->count == ~0) {
2064
2065 /* set overflow flag */
2066 replay->overflow++;
2067
2068 /* don't increment, no more packets accepted */
2069 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
2070 return 1;
2071
2072 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
2073 replay->overflow, ipsec_logsastr(sav)));
2074 }
2075
2076 replay->count++;
2077
2078 return 0;
2079 }
2080
2081 /*
2082 * shift variable length bunffer to left.
2083 * IN: bitmap: pointer to the buffer
2084 * nbit: the number of to shift.
2085 * wsize: buffer size (bytes).
2086 */
2087 static void
2088 vshiftl(unsigned char *bitmap, int nbit, int wsize)
2089 {
2090 int s, j, i;
2091 unsigned char over;
2092
2093 for (j = 0; j < nbit; j += 8) {
2094 s = (nbit - j < 8) ? (nbit - j): 8;
2095 bitmap[0] <<= s;
2096 for (i = 1; i < wsize; i++) {
2097 over = (bitmap[i] >> (8 - s));
2098 bitmap[i] <<= s;
2099 bitmap[i-1] |= over;
2100 }
2101 }
2102
2103 return;
2104 }
2105
2106 /* Return a printable string for the IPv4 address. */
2107 static char *
2108 inet_ntoa4(struct in_addr ina)
2109 {
2110 static char buf[4][4 * sizeof "123" + 4];
2111 unsigned char *ucp = (unsigned char *) &ina;
2112 static int i = 3;
2113
2114 i = (i + 1) % 4;
2115 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d",
2116 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff);
2117 return (buf[i]);
2118 }
2119
2120 /* Return a printable string for the address. */
2121 const char *
2122 ipsec_address(union sockaddr_union* sa)
2123 {
2124 switch (sa->sa.sa_family) {
2125 #if INET
2126 case AF_INET:
2127 return inet_ntoa4(sa->sin.sin_addr);
2128 #endif /* INET */
2129
2130 #if INET6
2131 case AF_INET6:
2132 return ip6_sprintf(&sa->sin6.sin6_addr);
2133 #endif /* INET6 */
2134
2135 default:
2136 return "(unknown address family)";
2137 }
2138 }
2139
2140 const char *
2141 ipsec_logsastr(struct secasvar *sav)
2142 {
2143 static char buf[256];
2144 char *p;
2145 struct secasindex *saidx = &sav->sah->saidx;
2146
2147 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
2148 ("ipsec_logsastr: address family mismatch"));
2149
2150 p = buf;
2151 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
2152 while (p && *p)
2153 p++;
2154 /* NB: only use ipsec_address on one address at a time */
2155 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
2156 ipsec_address(&saidx->src));
2157 while (p && *p)
2158 p++;
2159 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
2160 ipsec_address(&saidx->dst));
2161
2162 return buf;
2163 }
2164
2165 void
2166 ipsec_dumpmbuf(struct mbuf *m)
2167 {
2168 int totlen;
2169 int i;
2170 u_char *p;
2171
2172 totlen = 0;
2173 printf("---\n");
2174 while (m) {
2175 p = mtod(m, u_char *);
2176 for (i = 0; i < m->m_len; i++) {
2177 printf("%02x ", p[i]);
2178 totlen++;
2179 if (totlen % 16 == 0)
2180 printf("\n");
2181 }
2182 m = m->m_next;
2183 }
2184 if (totlen % 16 != 0)
2185 printf("\n");
2186 printf("---\n");
2187 }
2188
2189 #ifdef INET6
2190 struct secpolicy *
2191 ipsec6_check_policy(struct mbuf * m, const struct socket * so,
2192 int flags, int * needipsecp, int * errorp)
2193 {
2194 struct in6pcb *in6p = NULL;
2195 struct secpolicy *sp = NULL;
2196 int s;
2197 int error = 0;
2198 int needipsec = 0;
2199
2200 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6)
2201 in6p = sotoin6pcb(so);
2202
2203 if (!ipsec_outdone(m)) {
2204 s = splsoftnet();
2205 if (in6p != NULL &&
2206 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) {
2207 splx(s);
2208 goto skippolicycheck;
2209 }
2210 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p);
2211
2212 /*
2213 * There are four return cases:
2214 * sp != NULL apply IPsec policy
2215 * sp == NULL, error == 0 no IPsec handling needed
2216 * sp == NULL, error == -EINVAL discard packet w/o error
2217 * sp == NULL, error != 0 discard packet, report error
2218 */
2219
2220 splx(s);
2221 if (sp == NULL) {
2222 /*
2223 * Caller must check the error return to see if it needs to discard
2224 * the packet.
2225 */
2226 needipsec = 0;
2227 } else {
2228 needipsec = 1;
2229 }
2230 }
2231 skippolicycheck:;
2232
2233 *errorp = error;
2234 *needipsecp = needipsec;
2235 return sp;
2236 }
2237 #endif
2238
2239
2240
2241 /* XXX this stuff doesn't belong here... */
2242
2243 static struct xformsw* xforms = NULL;
2244
2245 /*
2246 * Register a transform; typically at system startup.
2247 */
2248 void
2249 xform_register(struct xformsw* xsp)
2250 {
2251 xsp->xf_next = xforms;
2252 xforms = xsp;
2253 }
2254
2255 /*
2256 * Initialize transform support in an sav.
2257 */
2258 int
2259 xform_init(struct secasvar *sav, int xftype)
2260 {
2261 struct xformsw *xsp;
2262
2263 if (sav->tdb_xform != NULL) /* previously initialized */
2264 return 0;
2265 for (xsp = xforms; xsp; xsp = xsp->xf_next)
2266 if (xsp->xf_type == xftype)
2267 return (*xsp->xf_init)(sav, xsp);
2268
2269 DPRINTF(("xform_init: no match for xform type %d\n", xftype));
2270 return EINVAL;
2271 }
2272
2273 #ifdef __NetBSD__
2274 /*
2275 * XXXJRT This should be done as a protosw init call.
2276 */
2277 void
2278 ipsec_attach(void)
2279 {
2280
2281 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS);
2282
2283 printf("initializing IPsec...");
2284 ah_attach();
2285 esp_attach();
2286 ipcomp_attach();
2287 ipe4_attach();
2288 #ifdef TCP_SIGNATURE
2289 tcpsignature_attach();
2290 #endif
2291 printf(" done\n");
2292 }
2293 #endif /* __NetBSD__ */
NetBSD on the FriendlyARM MINI2440