FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $NetBSD: ipsec.c,v 1.25.2.3 2007/10/31 12:39:29 liamjfoy 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 1.25.2.3 2007/10/31 12:39:29 liamjfoy 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
62 #include <net/if.h>
63 #include <net/route.h>
64
65 #include <netinet/in.h>
66 #include <netinet/in_systm.h>
67 #include <netinet/ip.h>
68 #include <netinet/ip_var.h>
69 #include <netinet/in_var.h>
70 #include <netinet/udp.h>
71 #include <netinet/udp_var.h>
72 #include <netinet/tcp.h>
73 #include <netinet/udp.h>
74
75 #include <netinet/ip6.h>
76 #ifdef INET6
77 #include <netinet6/ip6_var.h>
78 #endif
79 #include <netinet/in_pcb.h>
80 #ifdef INET6
81 #include <netinet6/in6_pcb.h>
82 #include <netinet/icmp6.h>
83 #endif
84
85 #include <netipsec/ipsec.h>
86 #include <netipsec/ipsec_var.h>
87 #ifdef INET6
88 #include <netipsec/ipsec6.h>
89 #endif
90 #include <netipsec/ah_var.h>
91 #include <netipsec/esp_var.h>
92 #include <netipsec/ipcomp.h> /*XXX*/
93 #include <netipsec/ipcomp_var.h>
94
95 #include <netipsec/key.h>
96 #include <netipsec/keydb.h>
97 #include <netipsec/key_debug.h>
98
99 #include <netipsec/xform.h>
100
101 #include <netipsec/ipsec_osdep.h>
102
103 #include <net/net_osdep.h>
104
105 #ifdef IPSEC_DEBUG
106 int ipsec_debug = 1;
107
108 /*
109 * When set to 1, IPsec will send packets with the same sequence number.
110 * This allows to verify if the other side has proper replay attacks detection.
111 */
112 int ipsec_replay = 0;
113
114 /*
115 * When set 1, IPsec will send packets with corrupted HMAC.
116 * This allows to verify if the other side properly detects modified packets.
117 */
118 int ipsec_integrity = 0;
119 #else
120 int ipsec_debug = 0;
121 #endif
122
123 /* NB: name changed so netstat doesn't use it */
124 struct newipsecstat newipsecstat;
125 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
126 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */
127 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
128 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
129 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
130 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
131 struct secpolicy ip4_def_policy;
132 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
133 int ip4_esp_randpad = -1;
134
135 #ifdef __NetBSD__
136 u_int ipsec_spdgen = 1; /* SPD generation # */
137
138 static struct secpolicy *ipsec_checkpcbcache __P((struct mbuf *,
139 struct inpcbpolicy *, int));
140 static int ipsec_fillpcbcache __P((struct inpcbpolicy *, struct mbuf *,
141 struct secpolicy *, int));
142 static int ipsec_invalpcbcache __P((struct inpcbpolicy *, int));
143 #endif /* __NetBSD__ */
144
145 /*
146 * Crypto support requirements:
147 *
148 * 1 require hardware support
149 * -1 require software support
150 * 0 take anything
151 */
152 int crypto_support = 0;
153
154 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int,
155 PCB_T *, int *);
156
157 #ifdef __FreeBSD__
158 SYSCTL_DECL(_net_inet_ipsec);
159
160 /* net.inet.ipsec */
161 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
162 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
163 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
164 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
165 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
166 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
167 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
168 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
169 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
170 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
171 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
172 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
173 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
174 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
175 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
176 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
177 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
178 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
179 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
180 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
181 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
182 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
183 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
184 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
185 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
186 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
187 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
188 "Emulate replay attack");
189 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
190 &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
191 #endif /* __FreeBSD__ */
192
193 #ifdef INET6
194 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
195 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
196 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
197 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
198 struct secpolicy ip6_def_policy;
199 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
200 int ip6_esp_randpad = -1;
201
202
203 #ifdef __FreeBSD__
204 SYSCTL_DECL(_net_inet6_ipsec6);
205
206 /* net.inet6.ipsec6 */
207 #ifdef COMPAT_KAME
208 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
209 0,0, compat_ipsecstats_sysctl, "S", "");
210 #endif /* COMPAT_KAME */
211 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
212 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
213 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
214 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
215 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
216 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
217 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
218 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
219 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
220 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
221 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
222 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
223 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
224 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
225 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
226 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
227 #endif /* INET6 */
228 #endif /* __FreeBSD__ */
229
230 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
231 #ifdef INET6
232 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
233 #endif
234 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
235 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
236 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
237 #ifdef INET6
238 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
239 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
240 #endif
241 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
242 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
243 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
244 int optname, caddr_t request, size_t len, int priv));
245 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
246 static void vshiftl __P((unsigned char *, int, int));
247 static size_t ipsec_hdrsiz __P((struct secpolicy *));
248
249 #ifdef __NetBSD__
250 /*
251 * Try to validate and use cached policy on a PCB.
252 */
253 static struct secpolicy *
254 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir)
255 {
256 struct secpolicyindex spidx;
257
258 switch (dir) {
259 case IPSEC_DIR_INBOUND:
260 case IPSEC_DIR_OUTBOUND:
261 case IPSEC_DIR_ANY:
262 break;
263 default:
264 return NULL;
265 }
266 #ifdef DIAGNOSTIC
267 if (pcbsp == NULL) {
268 printf("ipsec_checkpcbcache: NULL pcbsp\n");
269 /* XXX panic? */
270 return NULL;
271 }
272 #endif
273
274 #ifdef DIAGNOSTIC
275 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
276 panic("dir too big in ipsec_checkpcbcache");
277 #endif
278 /* SPD table change invalidate all the caches. */
279 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) {
280 ipsec_invalpcbcache(pcbsp, dir);
281 return NULL;
282 }
283 if (!pcbsp->sp_cache[dir].cachesp)
284 return NULL;
285 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) {
286 ipsec_invalpcbcache(pcbsp, dir);
287 return NULL;
288 }
289 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
290 if (!pcbsp->sp_cache[dir].cachesp)
291 return NULL;
292 if (ipsec_setspidx(m, &spidx, 1) != 0)
293 return NULL;
294
295 /*
296 * We have to make an exact match here since the cached rule
297 * might have lower priority than a rule that would otherwise
298 * have matched the packet.
299 */
300
301 if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx)))
302 return NULL;
303
304 } else {
305 /*
306 * The pcb is connected, and the L4 code is sure that:
307 * - outgoing side uses inp_[lf]addr
308 * - incoming side looks up policy after inpcb lookup
309 * and address pair is know to be stable. We do not need
310 * to generate spidx again, nor check the address match again.
311 *
312 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds
313 * and there are calls to ipsec_pcbconn() from in_pcbconnect().
314 */
315 }
316
317 pcbsp->sp_cache[dir].cachesp->lastused = time_second;
318 pcbsp->sp_cache[dir].cachesp->refcnt++;
319 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
320 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
321 pcbsp->sp_cache[dir].cachesp->refcnt,
322 pcbsp->sp_cache[dir].cachesp));
323 return pcbsp->sp_cache[dir].cachesp;
324 }
325
326 static int
327 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m,
328 struct secpolicy *sp, int dir)
329 {
330
331 switch (dir) {
332 case IPSEC_DIR_INBOUND:
333 case IPSEC_DIR_OUTBOUND:
334 break;
335 default:
336 return EINVAL;
337 }
338 #ifdef DIAGNOSTIC
339 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
340 panic("dir too big in ipsec_fillpcbcache");
341 #endif
342
343 if (pcbsp->sp_cache[dir].cachesp)
344 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp);
345 pcbsp->sp_cache[dir].cachesp = NULL;
346 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE;
347 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
348 return EINVAL;
349 }
350 pcbsp->sp_cache[dir].cachesp = sp;
351 if (pcbsp->sp_cache[dir].cachesp) {
352 pcbsp->sp_cache[dir].cachesp->refcnt++;
353 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
354 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
355 pcbsp->sp_cache[dir].cachesp->refcnt,
356 pcbsp->sp_cache[dir].cachesp));
357
358 /*
359 * If the PCB is connected, we can remember a hint to
360 * possibly short-circuit IPsec processing in other places.
361 */
362 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) {
363 switch (pcbsp->sp_cache[dir].cachesp->policy) {
364 case IPSEC_POLICY_NONE:
365 case IPSEC_POLICY_BYPASS:
366 pcbsp->sp_cache[dir].cachehint =
367 IPSEC_PCBHINT_NO;
368 break;
369 default:
370 pcbsp->sp_cache[dir].cachehint =
371 IPSEC_PCBHINT_YES;
372 }
373 }
374 }
375 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen;
376
377 return 0;
378 }
379
380 static int
381 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir)
382 {
383 int i;
384
385 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) {
386 if (dir != IPSEC_DIR_ANY && i != dir)
387 continue;
388 if (pcbsp->sp_cache[i].cachesp)
389 KEY_FREESP(&pcbsp->sp_cache[i].cachesp);
390 pcbsp->sp_cache[i].cachesp = NULL;
391 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE;
392 pcbsp->sp_cache[i].cachegen = 0;
393 bzero(&pcbsp->sp_cache[i].cacheidx,
394 sizeof(pcbsp->sp_cache[i].cacheidx));
395 }
396 return 0;
397 }
398
399 void
400 ipsec_pcbconn(struct inpcbpolicy *pcbsp)
401 {
402
403 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED;
404 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
405 }
406
407 void
408 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp)
409 {
410
411 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED;
412 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
413 }
414
415 void
416 ipsec_invalpcbcacheall(void)
417 {
418
419 if (ipsec_spdgen == UINT_MAX)
420 ipsec_spdgen = 1;
421 else
422 ipsec_spdgen++;
423 }
424 #endif /* __NetBSD__ */
425
426 /*
427 * Return a held reference to the default SP.
428 */
429 static struct secpolicy *
430 key_allocsp_default(int af, const char* where, int tag)
431 {
432 struct secpolicy *sp;
433
434 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
435 printf("DP key_allocsp_default from %s:%u\n", where, tag));
436
437 switch(af) {
438 case AF_INET:
439 sp = &ip4_def_policy;
440 break;
441 #ifdef INET6
442 case AF_INET6:
443 sp = &ip6_def_policy;
444 break;
445 #endif
446 default:
447 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
448 printf("key_allocsp_default : unexpected protocol family %u\n",
449 af));
450 return NULL;
451 }
452
453 if (sp->policy != IPSEC_POLICY_DISCARD &&
454 sp->policy != IPSEC_POLICY_NONE) {
455 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
456 sp->policy, IPSEC_POLICY_NONE));
457 sp->policy = IPSEC_POLICY_NONE;
458 }
459 sp->refcnt++;
460
461 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
462 printf("DP key_allocsp_default returns SP:%p (%u)\n",
463 sp, sp->refcnt));
464 return sp;
465 }
466 #define KEY_ALLOCSP_DEFAULT(af) \
467 key_allocsp_default((af),__FILE__, __LINE__)
468
469 /*
470 * For OUTBOUND packet having a socket. Searching SPD for packet,
471 * and return a pointer to SP.
472 * OUT: NULL: no apropreate SP found, the following value is set to error.
473 * 0 : bypass
474 * EACCES : discard packet.
475 * ENOENT : ipsec_acquire() in progress, maybe.
476 * others : error occurred.
477 * others: a pointer to SP
478 *
479 * NOTE: IPv6 mapped address concern is implemented here.
480 */
481 struct secpolicy *
482 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
483 {
484 struct secpolicy *sp;
485
486 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
487 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
488 ("ipsec_getpolicy: invalid direction %u", dir));
489
490 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
491 if (sp == NULL) /*XXX????*/
492 sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family);
493 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
494 return sp;
495 }
496
497 /*
498 * For OUTBOUND packet having a socket. Searching SPD for packet,
499 * and return a pointer to SP.
500 * OUT: NULL: no apropreate SP found, the following value is set to error.
501 * 0 : bypass
502 * EACCES : discard packet.
503 * ENOENT : ipsec_acquire() in progress, maybe.
504 * others : error occurred.
505 * others: a pointer to SP
506 *
507 * NOTE: IPv6 mapped address concern is implemented here.
508 */
509 static struct secpolicy *
510 ipsec_getpolicybysock(m, dir, inp, error)
511 struct mbuf *m;
512 u_int dir;
513 PCB_T *inp;
514 int *error;
515 {
516 struct inpcbpolicy *pcbsp = NULL;
517 struct secpolicy *currsp = NULL; /* policy on socket */
518 struct secpolicy *sp;
519 int af;
520
521 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
522 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
523 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
524 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
525 ("ipsec_getpolicybysock: invalid direction %u", dir));
526
527 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL,
528 ("ipsec_getppolicybysock: null socket\n"));
529
530 /* XXX FIXME inpcb/in6pcb vs socket*/
531 af = PCB_FAMILY(inp);
532 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
533 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
534
535 #ifdef __NetBSD__
536 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache"));
537 /* If we have a cached entry, and if it is still valid, use it. */
538 ipsecstat.ips_spdcache_lookup++;
539 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir);
540 if (currsp) {
541 *error = 0;
542 return currsp;
543 }
544 ipsecstat.ips_spdcache_miss++;
545 #endif /* __NetBSD__ */
546
547 switch (af) {
548 case AF_INET: {
549 struct inpcb *in4p = PCB_TO_IN4PCB(inp);
550 /* set spidx in pcb */
551 *error = ipsec4_setspidx_inpcb(m, in4p);
552 pcbsp = in4p->inp_sp;
553 break;
554 }
555
556 #if defined(INET6)
557 case AF_INET6: {
558 struct in6pcb *in6p = PCB_TO_IN6PCB(inp);
559 /* set spidx in pcb */
560 *error = ipsec6_setspidx_in6pcb(m, in6p);
561 pcbsp = in6p->in6p_sp;
562 break;
563 }
564 #endif
565 default:
566 *error = EPFNOSUPPORT;
567 break;
568 }
569 if (*error)
570 return NULL;
571
572 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
573 switch (dir) {
574 case IPSEC_DIR_INBOUND:
575 currsp = pcbsp->sp_in;
576 break;
577 case IPSEC_DIR_OUTBOUND:
578 currsp = pcbsp->sp_out;
579 break;
580 }
581 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
582
583 if (pcbsp->priv) { /* when privilieged socket */
584 switch (currsp->policy) {
585 case IPSEC_POLICY_BYPASS:
586 case IPSEC_POLICY_IPSEC:
587 currsp->refcnt++;
588 sp = currsp;
589 break;
590
591 case IPSEC_POLICY_ENTRUST:
592 /* look for a policy in SPD */
593 sp = KEY_ALLOCSP(&currsp->spidx, dir);
594 if (sp == NULL) /* no SP found */
595 sp = KEY_ALLOCSP_DEFAULT(af);
596 break;
597
598 default:
599 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
600 "Invalid policy for PCB %d\n", currsp->policy));
601 *error = EINVAL;
602 return NULL;
603 }
604 } else { /* unpriv, SPD has policy */
605 sp = KEY_ALLOCSP(&currsp->spidx, dir);
606 if (sp == NULL) { /* no SP found */
607 switch (currsp->policy) {
608 case IPSEC_POLICY_BYPASS:
609 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
610 "Illegal policy for non-priviliged defined %d\n",
611 currsp->policy));
612 *error = EINVAL;
613 return NULL;
614
615 case IPSEC_POLICY_ENTRUST:
616 sp = KEY_ALLOCSP_DEFAULT(af);
617 break;
618
619 case IPSEC_POLICY_IPSEC:
620 currsp->refcnt++;
621 sp = currsp;
622 break;
623
624 default:
625 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
626 "Invalid policy for PCB %d\n", currsp->policy));
627 *error = EINVAL;
628 return NULL;
629 }
630 }
631 }
632 IPSEC_ASSERT(sp != NULL,
633 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
634 pcbsp->priv, currsp->policy));
635 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
636 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
637 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
638 sp, sp->refcnt));
639 #ifdef __NetBSD__
640 ipsec_fillpcbcache(pcbsp, m, sp, dir);
641 #endif /* __NetBSD__ */
642 return sp;
643 }
644
645 /*
646 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
647 * and return a pointer to SP.
648 * OUT: positive: a pointer to the entry for security policy leaf matched.
649 * NULL: no apropreate SP found, the following value is set to error.
650 * 0 : bypass
651 * EACCES : discard packet.
652 * ENOENT : ipsec_acquire() in progress, maybe.
653 * others : error occurred.
654 */
655 struct secpolicy *
656 ipsec_getpolicybyaddr(m, dir, flag, error)
657 struct mbuf *m;
658 u_int dir;
659 int flag;
660 int *error;
661 {
662 struct secpolicyindex spidx;
663 struct secpolicy *sp;
664
665 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
666 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
667 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
668 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
669
670 sp = NULL;
671
672 /* Make an index to look for a policy. */
673 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1);
674 if (*error != 0) {
675 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
676 " dir %u flag %u\n", dir, flag));
677 bzero(&spidx, sizeof (spidx));
678 return NULL;
679 }
680
681 spidx.dir = dir;
682
683 if (key_havesp(dir)) {
684 sp = KEY_ALLOCSP(&spidx, dir);
685 }
686
687 if (sp == NULL) /* no SP found, use system default */
688 sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family);
689 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
690 return sp;
691 }
692
693 struct secpolicy *
694 ipsec4_checkpolicy(m, dir, flag, error, inp)
695 struct mbuf *m;
696 u_int dir, flag;
697 int *error;
698 struct inpcb *inp;
699 {
700 struct secpolicy *sp;
701
702 *error = 0;
703
704
705 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
706 if (inp == NULL || inp->inp_socket == NULL) {
707 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
708 } else
709 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error);
710 if (sp == NULL) {
711 IPSEC_ASSERT(*error != 0,
712 ("ipsec4_checkpolicy: getpolicy failed w/o error"));
713 newipsecstat.ips_out_inval++;
714 return NULL;
715 }
716 IPSEC_ASSERT(*error == 0,
717 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
718 switch (sp->policy) {
719 case IPSEC_POLICY_ENTRUST:
720 default:
721 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
722 /* fall thru... */
723 case IPSEC_POLICY_DISCARD:
724 newipsecstat.ips_out_polvio++;
725 *error = -EINVAL; /* packet is discarded by caller */
726 break;
727 case IPSEC_POLICY_BYPASS:
728 case IPSEC_POLICY_NONE:
729 KEY_FREESP(&sp);
730 sp = NULL; /* NB: force NULL result */
731 break;
732 case IPSEC_POLICY_IPSEC:
733 if (sp->req == NULL) /* acquire an SA */
734 *error = key_spdacquire(sp);
735 break;
736 }
737 if (*error != 0) {
738 KEY_FREESP(&sp);
739 sp = NULL;
740 }
741 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
742 return sp;
743 }
744
745 #ifdef INET6
746 struct secpolicy *
747 ipsec6_checkpolicy(m, dir, flag, error, in6p)
748 struct mbuf *m;
749 u_int dir, flag;
750 int *error;
751 struct in6pcb *in6p;
752 {
753 struct secpolicy *sp;
754
755 *error = 0;
756
757
758 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
759 if (in6p == NULL || in6p->in6p_socket == NULL) {
760 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
761 } else
762 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error);
763 if (sp == NULL) {
764 IPSEC_ASSERT(*error != 0,
765 ("ipsec6_checkpolicy: getpolicy failed w/o error"));
766 newipsecstat.ips_out_inval++;
767 return NULL;
768 }
769 IPSEC_ASSERT(*error == 0,
770 ("ipsec6_checkpolicy: sp w/ error set to %u", *error));
771 switch (sp->policy) {
772 case IPSEC_POLICY_ENTRUST:
773 default:
774 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy);
775 /* fall thru... */
776 case IPSEC_POLICY_DISCARD:
777 newipsecstat.ips_out_polvio++;
778 *error = -EINVAL; /* packet is discarded by caller */
779 break;
780 case IPSEC_POLICY_BYPASS:
781 case IPSEC_POLICY_NONE:
782 KEY_FREESP(&sp);
783 sp = NULL; /* NB: force NULL result */
784 break;
785 case IPSEC_POLICY_IPSEC:
786 if (sp->req == NULL) /* acquire an SA */
787 *error = key_spdacquire(sp);
788 break;
789 }
790 if (*error != 0) {
791 KEY_FREESP(&sp);
792 sp = NULL;
793 }
794 DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
795 return sp;
796 }
797 #endif /* INET6 */
798
799 static int
800 ipsec4_setspidx_inpcb(m, pcb)
801 struct mbuf *m;
802 struct inpcb *pcb;
803 {
804 int error;
805
806 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
807 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
808 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
809 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
810
811 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
812 if (error == 0) {
813 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
814 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
815 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
816 } else {
817 bzero(&pcb->inp_sp->sp_in->spidx,
818 sizeof (pcb->inp_sp->sp_in->spidx));
819 bzero(&pcb->inp_sp->sp_out->spidx,
820 sizeof (pcb->inp_sp->sp_in->spidx));
821 }
822 return error;
823 }
824
825 #ifdef INET6
826 static int
827 ipsec6_setspidx_in6pcb(m, pcb)
828 struct mbuf *m;
829 struct in6pcb *pcb;
830 {
831 struct secpolicyindex *spidx;
832 int error;
833
834 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
835 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
836 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
837 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
838
839 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
840 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
841
842 spidx = &pcb->in6p_sp->sp_in->spidx;
843 error = ipsec_setspidx(m, spidx, 1);
844 if (error)
845 goto bad;
846 spidx->dir = IPSEC_DIR_INBOUND;
847
848 spidx = &pcb->in6p_sp->sp_out->spidx;
849 error = ipsec_setspidx(m, spidx, 1);
850 if (error)
851 goto bad;
852 spidx->dir = IPSEC_DIR_OUTBOUND;
853
854 return 0;
855
856 bad:
857 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
858 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
859 return error;
860 }
861 #endif
862
863 /*
864 * configure security policy index (src/dst/proto/sport/dport)
865 * by looking at the content of mbuf.
866 * the caller is responsible for error recovery (like clearing up spidx).
867 */
868 static int
869 ipsec_setspidx(m, spidx, needport)
870 struct mbuf *m;
871 struct secpolicyindex *spidx;
872 int needport;
873 {
874 struct ip *ip = NULL;
875 struct ip ipbuf;
876 u_int v;
877 struct mbuf *n;
878 int len;
879 int error;
880
881 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
882
883 /*
884 * validate m->m_pkthdr.len. we see incorrect length if we
885 * mistakenly call this function with inconsistent mbuf chain
886 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
887 */
888 len = 0;
889 for (n = m; n; n = n->m_next)
890 len += n->m_len;
891 if (m->m_pkthdr.len != len) {
892 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
893 printf("ipsec_setspidx: "
894 "total of m_len(%d) != pkthdr.len(%d), "
895 "ignored.\n",
896 len, m->m_pkthdr.len));
897 return EINVAL;
898 }
899
900 if (m->m_pkthdr.len < sizeof(struct ip)) {
901 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
902 printf("ipsec_setspidx: "
903 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
904 m->m_pkthdr.len));
905 return EINVAL;
906 }
907
908 if (m->m_len >= sizeof(*ip))
909 ip = mtod(m, struct ip *);
910 else {
911 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
912 ip = &ipbuf;
913 }
914 #ifdef _IP_VHL
915 v = _IP_VHL_V(ip->ip_vhl);
916 #else
917 v = ip->ip_v;
918 #endif
919 switch (v) {
920 case 4:
921 error = ipsec4_setspidx_ipaddr(m, spidx);
922 if (error)
923 return error;
924 ipsec4_get_ulp(m, spidx, needport);
925 return 0;
926 #ifdef INET6
927 case 6:
928 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
929 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
930 printf("ipsec_setspidx: "
931 "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
932 "ignored.\n", m->m_pkthdr.len));
933 return EINVAL;
934 }
935 error = ipsec6_setspidx_ipaddr(m, spidx);
936 if (error)
937 return error;
938 ipsec6_get_ulp(m, spidx, needport);
939 return 0;
940 #endif
941 default:
942 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
943 printf("ipsec_setspidx: "
944 "unknown IP version %u, ignored.\n", v));
945 return EINVAL;
946 }
947 }
948
949 static void
950 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
951 {
952 u_int8_t nxt;
953 int off;
954
955 /* sanity check */
956 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
957 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),
958 ("ipsec4_get_ulp: packet too short"));
959
960 /* NB: ip_input() flips it into host endian XXX need more checking */
961 if (m->m_len >= sizeof(struct ip)) {
962 struct ip *ip = mtod(m, struct ip *);
963 if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
964 goto done;
965 #ifdef _IP_VHL
966 off = _IP_VHL_HL(ip->ip_vhl) << 2;
967 #else
968 off = ip->ip_hl << 2;
969 #endif
970 nxt = ip->ip_p;
971 } else {
972 struct ip ih;
973
974 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
975 if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK))
976 goto done;
977 #ifdef _IP_VHL
978 off = _IP_VHL_HL(ih.ip_vhl) << 2;
979 #else
980 off = ih.ip_hl << 2;
981 #endif
982 nxt = ih.ip_p;
983 }
984
985 while (off < m->m_pkthdr.len) {
986 struct ip6_ext ip6e;
987 struct tcphdr th;
988 struct udphdr uh;
989
990 switch (nxt) {
991 case IPPROTO_TCP:
992 spidx->ul_proto = nxt;
993 if (!needport)
994 goto done_proto;
995 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
996 goto done;
997 m_copydata(m, off, sizeof (th), (caddr_t) &th);
998 spidx->src.sin.sin_port = th.th_sport;
999 spidx->dst.sin.sin_port = th.th_dport;
1000 return;
1001 case IPPROTO_UDP:
1002 spidx->ul_proto = nxt;
1003 if (!needport)
1004 goto done_proto;
1005 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
1006 goto done;
1007 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
1008 spidx->src.sin.sin_port = uh.uh_sport;
1009 spidx->dst.sin.sin_port = uh.uh_dport;
1010 return;
1011 case IPPROTO_AH:
1012 if (m->m_pkthdr.len > off + sizeof(ip6e))
1013 goto done;
1014 /* XXX sigh, this works but is totally bogus */
1015 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
1016 off += (ip6e.ip6e_len + 2) << 2;
1017 nxt = ip6e.ip6e_nxt;
1018 break;
1019 case IPPROTO_ICMP:
1020 default:
1021 /* XXX intermediate headers??? */
1022 spidx->ul_proto = nxt;
1023 goto done_proto;
1024 }
1025 }
1026 done:
1027 spidx->ul_proto = IPSEC_ULPROTO_ANY;
1028 done_proto:
1029 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
1030 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
1031 }
1032
1033 /* assumes that m is sane */
1034 static int
1035 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
1036 {
1037 static const struct sockaddr_in template = {
1038 sizeof (struct sockaddr_in),
1039 AF_INET,
1040 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
1041 };
1042
1043 spidx->src.sin = template;
1044 spidx->dst.sin = template;
1045
1046 if (m->m_len < sizeof (struct ip)) {
1047 m_copydata(m, offsetof(struct ip, ip_src),
1048 sizeof (struct in_addr),
1049 (caddr_t) &spidx->src.sin.sin_addr);
1050 m_copydata(m, offsetof(struct ip, ip_dst),
1051 sizeof (struct in_addr),
1052 (caddr_t) &spidx->dst.sin.sin_addr);
1053 } else {
1054 struct ip *ip = mtod(m, struct ip *);
1055 spidx->src.sin.sin_addr = ip->ip_src;
1056 spidx->dst.sin.sin_addr = ip->ip_dst;
1057 }
1058
1059 spidx->prefs = sizeof(struct in_addr) << 3;
1060 spidx->prefd = sizeof(struct in_addr) << 3;
1061
1062 return 0;
1063 }
1064
1065 #ifdef INET6
1066 static void
1067 ipsec6_get_ulp(m, spidx, needport)
1068 struct mbuf *m;
1069 struct secpolicyindex *spidx;
1070 int needport;
1071 {
1072 int off, nxt;
1073 struct tcphdr th;
1074 struct udphdr uh;
1075
1076 /* sanity check */
1077 if (m == NULL)
1078 panic("ipsec6_get_ulp: NULL pointer was passed");
1079
1080 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1081 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
1082
1083 /* set default */
1084 spidx->ul_proto = IPSEC_ULPROTO_ANY;
1085 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
1086 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
1087
1088 nxt = -1;
1089 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
1090 if (off < 0 || m->m_pkthdr.len < off)
1091 return;
1092
1093 switch (nxt) {
1094 case IPPROTO_TCP:
1095 spidx->ul_proto = nxt;
1096 if (!needport)
1097 break;
1098 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
1099 break;
1100 m_copydata(m, off, sizeof(th), (caddr_t)&th);
1101 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
1102 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
1103 break;
1104 case IPPROTO_UDP:
1105 spidx->ul_proto = nxt;
1106 if (!needport)
1107 break;
1108 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
1109 break;
1110 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
1111 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
1112 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
1113 break;
1114 case IPPROTO_ICMPV6:
1115 default:
1116 /* XXX intermediate headers??? */
1117 spidx->ul_proto = nxt;
1118 break;
1119 }
1120 }
1121
1122 /* assumes that m is sane */
1123 static int
1124 ipsec6_setspidx_ipaddr(m, spidx)
1125 struct mbuf *m;
1126 struct secpolicyindex *spidx;
1127 {
1128 struct ip6_hdr *ip6 = NULL;
1129 struct ip6_hdr ip6buf;
1130 struct sockaddr_in6 *sin6;
1131
1132 if (m->m_len >= sizeof(*ip6))
1133 ip6 = mtod(m, struct ip6_hdr *);
1134 else {
1135 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
1136 ip6 = &ip6buf;
1137 }
1138
1139 sin6 = (struct sockaddr_in6 *)&spidx->src;
1140 bzero(sin6, sizeof(*sin6));
1141 sin6->sin6_family = AF_INET6;
1142 sin6->sin6_len = sizeof(struct sockaddr_in6);
1143 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
1144 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
1145 sin6->sin6_addr.s6_addr16[1] = 0;
1146 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
1147 }
1148 spidx->prefs = sizeof(struct in6_addr) << 3;
1149
1150 sin6 = (struct sockaddr_in6 *)&spidx->dst;
1151 bzero(sin6, sizeof(*sin6));
1152 sin6->sin6_family = AF_INET6;
1153 sin6->sin6_len = sizeof(struct sockaddr_in6);
1154 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
1155 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
1156 sin6->sin6_addr.s6_addr16[1] = 0;
1157 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
1158 }
1159 spidx->prefd = sizeof(struct in6_addr) << 3;
1160
1161 return 0;
1162 }
1163 #endif
1164
1165 static void
1166 ipsec_delpcbpolicy(p)
1167 struct inpcbpolicy *p;
1168 {
1169 free(p, M_SECA);
1170 }
1171
1172 /* initialize policy in PCB */
1173 int
1174 ipsec_init_policy(so, pcb_sp)
1175 struct socket *so;
1176 struct inpcbpolicy **pcb_sp;
1177 {
1178 struct inpcbpolicy *new;
1179
1180 /* sanity check. */
1181 if (so == NULL || pcb_sp == NULL)
1182 panic("ipsec_init_policy: NULL pointer was passed");
1183
1184 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
1185 M_SECA, M_NOWAIT|M_ZERO);
1186 if (new == NULL) {
1187 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
1188 return ENOBUFS;
1189 }
1190
1191 if (IPSEC_PRIVILEGED_SO(so))
1192 new->priv = 1;
1193 else
1194 new->priv = 0;
1195
1196 if ((new->sp_in = KEY_NEWSP()) == NULL) {
1197 ipsec_delpcbpolicy(new);
1198 return ENOBUFS;
1199 }
1200 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
1201 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
1202
1203 if ((new->sp_out = KEY_NEWSP()) == NULL) {
1204 KEY_FREESP(&new->sp_in);
1205 ipsec_delpcbpolicy(new);
1206 return ENOBUFS;
1207 }
1208 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
1209 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
1210
1211 *pcb_sp = new;
1212
1213 return 0;
1214 }
1215
1216 /* copy old ipsec policy into new */
1217 int
1218 ipsec_copy_policy(old, new)
1219 struct inpcbpolicy *old, *new;
1220 {
1221 struct secpolicy *sp;
1222
1223 sp = ipsec_deepcopy_policy(old->sp_in);
1224 if (sp) {
1225 KEY_FREESP(&new->sp_in);
1226 new->sp_in = sp;
1227 } else
1228 return ENOBUFS;
1229
1230 sp = ipsec_deepcopy_policy(old->sp_out);
1231 if (sp) {
1232 KEY_FREESP(&new->sp_out);
1233 new->sp_out = sp;
1234 } else
1235 return ENOBUFS;
1236
1237 new->priv = old->priv;
1238
1239 return 0;
1240 }
1241
1242 /* deep-copy a policy in PCB */
1243 static struct secpolicy *
1244 ipsec_deepcopy_policy(src)
1245 struct secpolicy *src;
1246 {
1247 struct ipsecrequest *newchain = NULL;
1248 struct ipsecrequest *p;
1249 struct ipsecrequest **q;
1250 struct ipsecrequest *r;
1251 struct secpolicy *dst;
1252
1253 if (src == NULL)
1254 return NULL;
1255 dst = KEY_NEWSP();
1256 if (dst == NULL)
1257 return NULL;
1258
1259 /*
1260 * deep-copy IPsec request chain. This is required since struct
1261 * ipsecrequest is not reference counted.
1262 */
1263 q = &newchain;
1264 for (p = src->req; p; p = p->next) {
1265 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
1266 M_SECA, M_NOWAIT);
1267 if (*q == NULL)
1268 goto fail;
1269 bzero(*q, sizeof(**q));
1270 (*q)->next = NULL;
1271
1272 (*q)->saidx.proto = p->saidx.proto;
1273 (*q)->saidx.mode = p->saidx.mode;
1274 (*q)->level = p->level;
1275 (*q)->saidx.reqid = p->saidx.reqid;
1276
1277 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
1278 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
1279
1280 (*q)->sav = NULL;
1281 (*q)->sp = dst;
1282
1283 q = &((*q)->next);
1284 }
1285
1286 dst->req = newchain;
1287 dst->state = src->state;
1288 dst->policy = src->policy;
1289 /* do not touch the refcnt fields */
1290
1291 return dst;
1292
1293 fail:
1294 for (p = newchain; p; p = r) {
1295 r = p->next;
1296 free(p, M_SECA);
1297 p = NULL;
1298 }
1299 return NULL;
1300 }
1301
1302 /* set policy and ipsec request if present. */
1303 static int
1304 ipsec_set_policy(
1305 struct secpolicy **pcb_sp,
1306 int optname,
1307 caddr_t request,
1308 size_t len,
1309 int priv
1310 )
1311 {
1312 struct sadb_x_policy *xpl;
1313 struct secpolicy *newsp = NULL;
1314 int error;
1315
1316 /* sanity check. */
1317 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1318 return EINVAL;
1319 if (len < sizeof(*xpl))
1320 return EINVAL;
1321 xpl = (struct sadb_x_policy *)request;
1322
1323 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1324 printf("ipsec_set_policy: passed policy\n");
1325 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1326
1327 /* check policy type */
1328 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1329 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1330 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1331 return EINVAL;
1332
1333 /* check privileged socket */
1334 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1335 return EACCES;
1336
1337 /* allocation new SP entry */
1338 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1339 return error;
1340
1341 newsp->state = IPSEC_SPSTATE_ALIVE;
1342
1343 /* clear old SP and set new SP */
1344 KEY_FREESP(pcb_sp);
1345 *pcb_sp = newsp;
1346 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1347 printf("ipsec_set_policy: new policy\n");
1348 kdebug_secpolicy(newsp));
1349
1350 return 0;
1351 }
1352
1353 static int
1354 ipsec_get_policy(pcb_sp, mp)
1355 struct secpolicy *pcb_sp;
1356 struct mbuf **mp;
1357 {
1358
1359 /* sanity check. */
1360 if (pcb_sp == NULL || mp == NULL)
1361 return EINVAL;
1362
1363 *mp = key_sp2msg(pcb_sp);
1364 if (!*mp) {
1365 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1366 return ENOBUFS;
1367 }
1368
1369 (*mp)->m_type = MT_DATA;
1370 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1371 printf("ipsec_get_policy:\n");
1372 kdebug_mbuf(*mp));
1373
1374 return 0;
1375 }
1376
1377 int
1378 ipsec4_set_policy(inp, optname, request, len, priv)
1379 struct inpcb *inp;
1380 int optname;
1381 caddr_t request;
1382 size_t len;
1383 int priv;
1384 {
1385 struct sadb_x_policy *xpl;
1386 struct secpolicy **pcb_sp;
1387
1388 /* sanity check. */
1389 if (inp == NULL || request == NULL)
1390 return EINVAL;
1391 if (len < sizeof(*xpl))
1392 return EINVAL;
1393 xpl = (struct sadb_x_policy *)request;
1394
1395 IPSEC_ASSERT(inp->inp_sp != NULL,
1396 ("ipsec4_set_policy(): null inp->in_sp"));
1397
1398 /* select direction */
1399 switch (xpl->sadb_x_policy_dir) {
1400 case IPSEC_DIR_INBOUND:
1401 pcb_sp = &inp->inp_sp->sp_in;
1402 break;
1403 case IPSEC_DIR_OUTBOUND:
1404 pcb_sp = &inp->inp_sp->sp_out;
1405 break;
1406 default:
1407 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1408 xpl->sadb_x_policy_dir));
1409 return EINVAL;
1410 }
1411
1412 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1413 }
1414
1415 int
1416 ipsec4_get_policy(inp, request, len, mp)
1417 struct inpcb *inp;
1418 caddr_t request;
1419 size_t len;
1420 struct mbuf **mp;
1421 {
1422 struct sadb_x_policy *xpl;
1423 struct secpolicy *pcb_sp;
1424
1425 /* sanity check. */
1426 if (inp == NULL || request == NULL || mp == NULL)
1427 return EINVAL;
1428 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1429 if (len < sizeof(*xpl))
1430 return EINVAL;
1431 xpl = (struct sadb_x_policy *)request;
1432
1433 /* select direction */
1434 switch (xpl->sadb_x_policy_dir) {
1435 case IPSEC_DIR_INBOUND:
1436 pcb_sp = inp->inp_sp->sp_in;
1437 break;
1438 case IPSEC_DIR_OUTBOUND:
1439 pcb_sp = inp->inp_sp->sp_out;
1440 break;
1441 default:
1442 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1443 xpl->sadb_x_policy_dir));
1444 return EINVAL;
1445 }
1446
1447 return ipsec_get_policy(pcb_sp, mp);
1448 }
1449
1450 /* delete policy in PCB */
1451 int
1452 ipsec4_delete_pcbpolicy(inp)
1453 struct inpcb *inp;
1454 {
1455 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1456
1457 if (inp->inp_sp == NULL)
1458 return 0;
1459
1460 if (inp->inp_sp->sp_in != NULL)
1461 KEY_FREESP(&inp->inp_sp->sp_in);
1462
1463 if (inp->inp_sp->sp_out != NULL)
1464 KEY_FREESP(&inp->inp_sp->sp_out);
1465
1466 ipsec_delpcbpolicy(inp->inp_sp);
1467 inp->inp_sp = NULL;
1468
1469 return 0;
1470 }
1471
1472 #ifdef INET6
1473 int
1474 ipsec6_set_policy(in6p, optname, request, len, priv)
1475 struct in6pcb *in6p;
1476 int optname;
1477 caddr_t request;
1478 size_t len;
1479 int priv;
1480 {
1481 struct sadb_x_policy *xpl;
1482 struct secpolicy **pcb_sp;
1483
1484 /* sanity check. */
1485 if (in6p == NULL || request == NULL)
1486 return EINVAL;
1487 if (len < sizeof(*xpl))
1488 return EINVAL;
1489 xpl = (struct sadb_x_policy *)request;
1490
1491 /* select direction */
1492 switch (xpl->sadb_x_policy_dir) {
1493 case IPSEC_DIR_INBOUND:
1494 pcb_sp = &in6p->in6p_sp->sp_in;
1495 break;
1496 case IPSEC_DIR_OUTBOUND:
1497 pcb_sp = &in6p->in6p_sp->sp_out;
1498 break;
1499 default:
1500 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1501 xpl->sadb_x_policy_dir));
1502 return EINVAL;
1503 }
1504
1505 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1506 }
1507
1508 int
1509 ipsec6_get_policy(in6p, request, len, mp)
1510 struct in6pcb *in6p;
1511 caddr_t request;
1512 size_t len;
1513 struct mbuf **mp;
1514 {
1515 struct sadb_x_policy *xpl;
1516 struct secpolicy *pcb_sp;
1517
1518 /* sanity check. */
1519 if (in6p == NULL || request == NULL || mp == NULL)
1520 return EINVAL;
1521 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1522 if (len < sizeof(*xpl))
1523 return EINVAL;
1524 xpl = (struct sadb_x_policy *)request;
1525
1526 /* select direction */
1527 switch (xpl->sadb_x_policy_dir) {
1528 case IPSEC_DIR_INBOUND:
1529 pcb_sp = in6p->in6p_sp->sp_in;
1530 break;
1531 case IPSEC_DIR_OUTBOUND:
1532 pcb_sp = in6p->in6p_sp->sp_out;
1533 break;
1534 default:
1535 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1536 xpl->sadb_x_policy_dir));
1537 return EINVAL;
1538 }
1539
1540 return ipsec_get_policy(pcb_sp, mp);
1541 }
1542
1543 int
1544 ipsec6_delete_pcbpolicy(in6p)
1545 struct in6pcb *in6p;
1546 {
1547 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1548
1549 if (in6p->in6p_sp == NULL)
1550 return 0;
1551
1552 if (in6p->in6p_sp->sp_in != NULL)
1553 KEY_FREESP(&in6p->in6p_sp->sp_in);
1554
1555 if (in6p->in6p_sp->sp_out != NULL)
1556 KEY_FREESP(&in6p->in6p_sp->sp_out);
1557
1558 ipsec_delpcbpolicy(in6p->in6p_sp);
1559 in6p->in6p_sp = NULL;
1560
1561 return 0;
1562 }
1563 #endif
1564
1565 /*
1566 * return current level.
1567 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1568 */
1569 u_int
1570 ipsec_get_reqlevel(isr)
1571 struct ipsecrequest *isr;
1572 {
1573 u_int level = 0;
1574 u_int esp_trans_deflev, esp_net_deflev;
1575 u_int ah_trans_deflev, ah_net_deflev;
1576
1577 IPSEC_ASSERT(isr != NULL && isr->sp != NULL,
1578 ("ipsec_get_reqlevel: null argument"));
1579 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1580 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1581 isr->sp->spidx.src.sa.sa_family,
1582 isr->sp->spidx.dst.sa.sa_family));
1583
1584 /* XXX note that we have ipseclog() expanded here - code sync issue */
1585 #define IPSEC_CHECK_DEFAULT(lev) \
1586 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1587 && (lev) != IPSEC_LEVEL_UNIQUE) \
1588 ? (ipsec_debug \
1589 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1590 (lev), IPSEC_LEVEL_REQUIRE) \
1591 : 0), \
1592 (lev) = IPSEC_LEVEL_REQUIRE, \
1593 (lev) \
1594 : (lev))
1595
1596 /* set default level */
1597 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1598 #ifdef INET
1599 case AF_INET:
1600 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1601 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1602 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1603 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1604 break;
1605 #endif
1606 #ifdef INET6
1607 case AF_INET6:
1608 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1609 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1610 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1611 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1612 break;
1613 #endif /* INET6 */
1614 default:
1615 panic("key_get_reqlevel: unknown af %u",
1616 isr->sp->spidx.src.sa.sa_family);
1617 }
1618
1619 #undef IPSEC_CHECK_DEFAULT
1620
1621 /* set level */
1622 switch (isr->level) {
1623 case IPSEC_LEVEL_DEFAULT:
1624 switch (isr->saidx.proto) {
1625 case IPPROTO_ESP:
1626 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1627 level = esp_net_deflev;
1628 else
1629 level = esp_trans_deflev;
1630 break;
1631 case IPPROTO_AH:
1632 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1633 level = ah_net_deflev;
1634 else
1635 level = ah_trans_deflev;
1636 break;
1637 case IPPROTO_IPCOMP:
1638 /*
1639 * we don't really care, as IPcomp document says that
1640 * we shouldn't compress small packets
1641 */
1642 level = IPSEC_LEVEL_USE;
1643 break;
1644 default:
1645 panic("ipsec_get_reqlevel: Illegal protocol defined %u",
1646 isr->saidx.proto);
1647 }
1648 break;
1649
1650 case IPSEC_LEVEL_USE:
1651 case IPSEC_LEVEL_REQUIRE:
1652 level = isr->level;
1653 break;
1654 case IPSEC_LEVEL_UNIQUE:
1655 level = IPSEC_LEVEL_REQUIRE;
1656 break;
1657
1658 default:
1659 panic("ipsec_get_reqlevel: Illegal IPsec level %u",
1660 isr->level);
1661 }
1662
1663 return level;
1664 }
1665
1666 /*
1667 * Check security policy requirements against the actual
1668 * packet contents. Return one if the packet should be
1669 * reject as "invalid"; otherwiser return zero to have the
1670 * packet treated as "valid".
1671 *
1672 * OUT:
1673 * 0: valid
1674 * 1: invalid
1675 */
1676 int
1677 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1678 {
1679 struct ipsecrequest *isr;
1680 int need_auth;
1681
1682 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1683 printf("ipsec_in_reject: using SP\n");
1684 kdebug_secpolicy(sp));
1685
1686 /* check policy */
1687 switch (sp->policy) {
1688 case IPSEC_POLICY_DISCARD:
1689 return 1;
1690 case IPSEC_POLICY_BYPASS:
1691 case IPSEC_POLICY_NONE:
1692 return 0;
1693 }
1694
1695 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1696 ("ipsec_in_reject: invalid policy %u", sp->policy));
1697
1698 /* XXX should compare policy against ipsec header history */
1699
1700 need_auth = 0;
1701 for (isr = sp->req; isr != NULL; isr = isr->next) {
1702 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1703 continue;
1704 switch (isr->saidx.proto) {
1705 case IPPROTO_ESP:
1706 if ((m->m_flags & M_DECRYPTED) == 0) {
1707 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1708 printf("ipsec_in_reject: ESP m_flags:%x\n",
1709 m->m_flags));
1710 return 1;
1711 }
1712
1713 if (!need_auth &&
1714 isr->sav != NULL &&
1715 isr->sav->tdb_authalgxform != NULL &&
1716 (m->m_flags & M_AUTHIPDGM) == 0) {
1717 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1718 printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1719 m->m_flags));
1720 return 1;
1721 }
1722 break;
1723 case IPPROTO_AH:
1724 need_auth = 1;
1725 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1726 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1727 printf("ipsec_in_reject: AH m_flags:%x\n",
1728 m->m_flags));
1729 return 1;
1730 }
1731 break;
1732 case IPPROTO_IPCOMP:
1733 /*
1734 * we don't really care, as IPcomp document
1735 * says that we shouldn't compress small
1736 * packets, IPComp policy should always be
1737 * treated as being in "use" level.
1738 */
1739 break;
1740 }
1741 }
1742 return 0; /* valid */
1743 }
1744
1745 /*
1746 * Check AH/ESP integrity.
1747 * This function is called from tcp_input(), udp_input(),
1748 * and {ah,esp}4_input for tunnel mode
1749 */
1750 int
1751 ipsec4_in_reject(m, inp)
1752 struct mbuf *m;
1753 struct inpcb *inp;
1754 {
1755 struct secpolicy *sp;
1756 int error;
1757 int result;
1758
1759 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1760
1761 /* get SP for this packet.
1762 * When we are called from ip_forward(), we call
1763 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1764 */
1765 if (inp == NULL)
1766 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1767 else
1768 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1769 IN4PCB_TO_PCB(inp), &error);
1770
1771 if (sp != NULL) {
1772 result = ipsec_in_reject(sp, m);
1773 if (result)
1774 newipsecstat.ips_in_polvio++;
1775 KEY_FREESP(&sp);
1776 } else {
1777 result = 0; /* XXX should be panic ?
1778 * -> No, there may be error. */
1779 }
1780 return result;
1781 }
1782
1783
1784 #ifdef INET6
1785 /*
1786 * Check AH/ESP integrity.
1787 * This function is called from tcp6_input(), udp6_input(),
1788 * and {ah,esp}6_input for tunnel mode
1789 */
1790 int
1791 ipsec6_in_reject(m, in6p)
1792 struct mbuf *m;
1793 struct in6pcb *in6p;
1794 {
1795 struct secpolicy *sp = NULL;
1796 int error;
1797 int result;
1798
1799 /* sanity check */
1800 if (m == NULL)
1801 return 0; /* XXX should be panic ? */
1802
1803 /* get SP for this packet.
1804 * When we are called from ip_forward(), we call
1805 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1806 */
1807 if (in6p == NULL)
1808 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1809 else
1810 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1811 IN6PCB_TO_PCB(in6p),
1812 &error);
1813
1814 if (sp != NULL) {
1815 result = ipsec_in_reject(sp, m);
1816 if (result)
1817 newipsecstat.ips_in_polvio++;
1818 KEY_FREESP(&sp);
1819 } else {
1820 result = 0;
1821 }
1822 return result;
1823 }
1824 #endif
1825
1826 /*
1827 * compute the byte size to be occupied by IPsec header.
1828 * in case it is tunneled, it includes the size of outer IP header.
1829 * NOTE: SP passed is free in this function.
1830 */
1831 static size_t
1832 ipsec_hdrsiz(struct secpolicy *sp)
1833 {
1834 struct ipsecrequest *isr;
1835 size_t siz;
1836
1837 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1838 printf("ipsec_hdrsiz: using SP\n");
1839 kdebug_secpolicy(sp));
1840
1841 switch (sp->policy) {
1842 case IPSEC_POLICY_DISCARD:
1843 case IPSEC_POLICY_BYPASS:
1844 case IPSEC_POLICY_NONE:
1845 return 0;
1846 }
1847
1848 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1849 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1850
1851 siz = 0;
1852 for (isr = sp->req; isr != NULL; isr = isr->next) {
1853 size_t clen = 0;
1854
1855 switch (isr->saidx.proto) {
1856 case IPPROTO_ESP:
1857 clen = esp_hdrsiz(isr->sav);
1858 break;
1859 case IPPROTO_AH:
1860 clen = ah_hdrsiz(isr->sav);
1861 break;
1862 case IPPROTO_IPCOMP:
1863 clen = sizeof(struct ipcomp);
1864 break;
1865 }
1866
1867 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1868 switch (isr->saidx.dst.sa.sa_family) {
1869 case AF_INET:
1870 clen += sizeof(struct ip);
1871 break;
1872 #ifdef INET6
1873 case AF_INET6:
1874 clen += sizeof(struct ip6_hdr);
1875 break;
1876 #endif
1877 default:
1878 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1879 "unknown AF %d in IPsec tunnel SA\n",
1880 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1881 break;
1882 }
1883 }
1884 siz += clen;
1885 }
1886
1887 return siz;
1888 }
1889
1890 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1891 size_t
1892 ipsec4_hdrsiz(m, dir, inp)
1893 struct mbuf *m;
1894 u_int dir;
1895 struct inpcb *inp;
1896 {
1897 struct secpolicy *sp;
1898 int error;
1899 size_t size;
1900
1901 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1902 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL,
1903 ("ipsec4_hdrsize: socket w/o inpcb"));
1904
1905 /* get SP for this packet.
1906 * When we are called from ip_forward(), we call
1907 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1908 */
1909 if (inp == NULL)
1910 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1911 else
1912 sp = ipsec_getpolicybysock(m, dir,
1913 IN4PCB_TO_PCB(inp), &error);
1914
1915 if (sp != NULL) {
1916 size = ipsec_hdrsiz(sp);
1917 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1918 printf("ipsec4_hdrsiz: size:%lu.\n",
1919 (unsigned long)size));
1920
1921 KEY_FREESP(&sp);
1922 } else {
1923 size = 0; /* XXX should be panic ? */
1924 }
1925 return size;
1926 }
1927
1928 #ifdef INET6
1929 /* This function is called from ipsec6_hdrsize_tcp(),
1930 * and maybe from ip6_forward.()
1931 */
1932 size_t
1933 ipsec6_hdrsiz(m, dir, in6p)
1934 struct mbuf *m;
1935 u_int dir;
1936 struct in6pcb *in6p;
1937 {
1938 struct secpolicy *sp;
1939 int error;
1940 size_t size;
1941
1942 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1943 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1944 ("ipsec6_hdrsize: socket w/o inpcb"));
1945
1946 /* get SP for this packet */
1947 /* XXX Is it right to call with IP_FORWARDING. */
1948 if (in6p == NULL)
1949 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1950 else
1951 sp = ipsec_getpolicybysock(m, dir,
1952 IN6PCB_TO_PCB(in6p),
1953 &error);
1954
1955 if (sp == NULL)
1956 return 0;
1957 size = ipsec_hdrsiz(sp);
1958 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1959 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1960 KEY_FREESP(&sp);
1961
1962 return size;
1963 }
1964 #endif /*INET6*/
1965
1966 /*
1967 * Check the variable replay window.
1968 * ipsec_chkreplay() performs replay check before ICV verification.
1969 * ipsec_updatereplay() updates replay bitmap. This must be called after
1970 * ICV verification (it also performs replay check, which is usually done
1971 * beforehand).
1972 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1973 *
1974 * based on RFC 2401.
1975 */
1976 int
1977 ipsec_chkreplay(seq, sav)
1978 u_int32_t seq;
1979 struct secasvar *sav;
1980 {
1981 const struct secreplay *replay;
1982 u_int32_t diff;
1983 int fr;
1984 u_int32_t wsizeb; /* constant: bits of window size */
1985 int frlast; /* constant: last frame */
1986
1987 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay");
1988
1989 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1990 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1991
1992 replay = sav->replay;
1993
1994 if (replay->wsize == 0)
1995 return 1; /* no need to check replay. */
1996
1997 /* constant */
1998 frlast = replay->wsize - 1;
1999 wsizeb = replay->wsize << 3;
2000
2001 /* sequence number of 0 is invalid */
2002 if (seq == 0)
2003 return 0;
2004
2005 /* first time is always okay */
2006 if (replay->count == 0)
2007 return 1;
2008
2009 if (seq > replay->lastseq) {
2010 /* larger sequences are okay */
2011 return 1;
2012 } else {
2013 /* seq is equal or less than lastseq. */
2014 diff = replay->lastseq - seq;
2015
2016 /* over range to check, i.e. too old or wrapped */
2017 if (diff >= wsizeb)
2018 return 0;
2019
2020 fr = frlast - diff / 8;
2021
2022 /* this packet already seen ? */
2023 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2024 return 0;
2025
2026 /* out of order but good */
2027 return 1;
2028 }
2029 }
2030
2031 /*
2032 * check replay counter whether to update or not.
2033 * OUT: 0: OK
2034 * 1: NG
2035 */
2036 int
2037 ipsec_updatereplay(seq, sav)
2038 u_int32_t seq;
2039 struct secasvar *sav;
2040 {
2041 struct secreplay *replay;
2042 u_int32_t diff;
2043 int fr;
2044 u_int32_t wsizeb; /* constant: bits of window size */
2045 int frlast; /* constant: last frame */
2046
2047 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay");
2048
2049 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
2050 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
2051
2052 replay = sav->replay;
2053
2054 if (replay->wsize == 0)
2055 goto ok; /* no need to check replay. */
2056
2057 /* constant */
2058 frlast = replay->wsize - 1;
2059 wsizeb = replay->wsize << 3;
2060
2061 /* sequence number of 0 is invalid */
2062 if (seq == 0)
2063 return 1;
2064
2065 /* first time */
2066 if (replay->count == 0) {
2067 replay->lastseq = seq;
2068 bzero(replay->bitmap, replay->wsize);
2069 (replay->bitmap)[frlast] = 1;
2070 goto ok;
2071 }
2072
2073 if (seq > replay->lastseq) {
2074 /* seq is larger than lastseq. */
2075 diff = seq - replay->lastseq;
2076
2077 /* new larger sequence number */
2078 if (diff < wsizeb) {
2079 /* In window */
2080 /* set bit for this packet */
2081 vshiftl(replay->bitmap, diff, replay->wsize);
2082 (replay->bitmap)[frlast] |= 1;
2083 } else {
2084 /* this packet has a "way larger" */
2085 bzero(replay->bitmap, replay->wsize);
2086 (replay->bitmap)[frlast] = 1;
2087 }
2088 replay->lastseq = seq;
2089
2090 /* larger is good */
2091 } else {
2092 /* seq is equal or less than lastseq. */
2093 diff = replay->lastseq - seq;
2094
2095 /* over range to check, i.e. too old or wrapped */
2096 if (diff >= wsizeb)
2097 return 1;
2098
2099 fr = frlast - diff / 8;
2100
2101 /* this packet already seen ? */
2102 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2103 return 1;
2104
2105 /* mark as seen */
2106 (replay->bitmap)[fr] |= (1 << (diff % 8));
2107
2108 /* out of order but good */
2109 }
2110
2111 ok:
2112 if (replay->count == ~0) {
2113
2114 /* set overflow flag */
2115 replay->overflow++;
2116
2117 /* don't increment, no more packets accepted */
2118 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
2119 return 1;
2120
2121 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
2122 replay->overflow, ipsec_logsastr(sav)));
2123 }
2124
2125 replay->count++;
2126
2127 return 0;
2128 }
2129
2130 /*
2131 * shift variable length bunffer to left.
2132 * IN: bitmap: pointer to the buffer
2133 * nbit: the number of to shift.
2134 * wsize: buffer size (bytes).
2135 */
2136 static void
2137 vshiftl(bitmap, nbit, wsize)
2138 unsigned char *bitmap;
2139 int nbit, wsize;
2140 {
2141 int s, j, i;
2142 unsigned char over;
2143
2144 for (j = 0; j < nbit; j += 8) {
2145 s = (nbit - j < 8) ? (nbit - j): 8;
2146 bitmap[0] <<= s;
2147 for (i = 1; i < wsize; i++) {
2148 over = (bitmap[i] >> (8 - s));
2149 bitmap[i] <<= s;
2150 bitmap[i-1] |= over;
2151 }
2152 }
2153
2154 return;
2155 }
2156
2157 /* Return a printable string for the IPv4 address. */
2158 static char *
2159 inet_ntoa4(struct in_addr ina)
2160 {
2161 static char buf[4][4 * sizeof "123" + 4];
2162 unsigned char *ucp = (unsigned char *) &ina;
2163 static int i = 3;
2164
2165 i = (i + 1) % 4;
2166 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d",
2167 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff);
2168 return (buf[i]);
2169 }
2170
2171 /* Return a printable string for the address. */
2172 const char *
2173 ipsec_address(union sockaddr_union* sa)
2174 {
2175 switch (sa->sa.sa_family) {
2176 #if INET
2177 case AF_INET:
2178 return inet_ntoa4(sa->sin.sin_addr);
2179 #endif /* INET */
2180
2181 #if INET6
2182 case AF_INET6:
2183 return ip6_sprintf(&sa->sin6.sin6_addr);
2184 #endif /* INET6 */
2185
2186 default:
2187 return "(unknown address family)";
2188 }
2189 }
2190
2191 const char *
2192 ipsec_logsastr(sav)
2193 struct secasvar *sav;
2194 {
2195 static char buf[256];
2196 char *p;
2197 struct secasindex *saidx = &sav->sah->saidx;
2198
2199 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
2200 ("ipsec_logsastr: address family mismatch"));
2201
2202 p = buf;
2203 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
2204 while (p && *p)
2205 p++;
2206 /* NB: only use ipsec_address on one address at a time */
2207 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
2208 ipsec_address(&saidx->src));
2209 while (p && *p)
2210 p++;
2211 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
2212 ipsec_address(&saidx->dst));
2213
2214 return buf;
2215 }
2216
2217 void
2218 ipsec_dumpmbuf(m)
2219 struct mbuf *m;
2220 {
2221 int totlen;
2222 int i;
2223 u_char *p;
2224
2225 totlen = 0;
2226 printf("---\n");
2227 while (m) {
2228 p = mtod(m, u_char *);
2229 for (i = 0; i < m->m_len; i++) {
2230 printf("%02x ", p[i]);
2231 totlen++;
2232 if (totlen % 16 == 0)
2233 printf("\n");
2234 }
2235 m = m->m_next;
2236 }
2237 if (totlen % 16 != 0)
2238 printf("\n");
2239 printf("---\n");
2240 }
2241
2242 #ifdef INET6
2243 struct secpolicy *
2244 ipsec6_check_policy(m,so,flags,needipsecp,errorp)
2245 struct mbuf * m;
2246 const struct socket * so;
2247 int flags;
2248 int * needipsecp;
2249 int * errorp;
2250 {
2251 struct in6pcb *in6p = NULL;
2252 struct m_tag *mtag;
2253 struct secpolicy *sp = NULL;
2254 struct tdb_ident *tdbi;
2255 int s;
2256 int error = 0;
2257 int needipsec = 0;
2258
2259 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6)
2260 in6p = sotoin6pcb(so);
2261
2262 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
2263 s = splsoftnet();
2264 if (mtag != NULL) {
2265 tdbi = (struct tdb_ident *)(mtag + 1);
2266 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
2267 if (sp == NULL)
2268 error = -EINVAL; /* force silent drop */
2269 m_tag_delete(m, mtag);
2270 } else {
2271 if (in6p != NULL &&
2272 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND))
2273 goto skippolicycheck;
2274 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p);
2275 }
2276
2277 /*
2278 * There are four return cases:
2279 * sp != NULL apply IPsec policy
2280 * sp == NULL, error == 0 no IPsec handling needed
2281 * sp == NULL, error == -EINVAL discard packet w/o error
2282 * sp == NULL, error != 0 discard packet, report error
2283 */
2284
2285 if (sp == NULL) {
2286 splx(s);
2287
2288 if (error != 0) {
2289 needipsec = 0;
2290 } else {
2291 /* No IPsec processing for this packet. */
2292 needipsec = 0;
2293 }
2294 } else {
2295 /* Loop detection, check if ipsec processing already done */
2296 IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request"));
2297 for (mtag = m_tag_first(m); mtag != NULL;
2298 mtag = m_tag_next(m, mtag)) {
2299 #ifdef MTAG_ABI_COMPAT
2300 if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
2301 continue;
2302 #endif
2303 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
2304 mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
2305 continue;
2306 /*
2307 * Check if policy has an SA associated with it.
2308 * This can happen when an SP has yet to acquire
2309 * an SA; e.g. on first reference. If it occurs,
2310 * then we let ipsec4_process_packet do its thing.
2311 */
2312 if (sp->req->sav == NULL)
2313 break;
2314 tdbi = (struct tdb_ident *)(mtag + 1);
2315 if (tdbi->spi == sp->req->sav->spi &&
2316 tdbi->proto == sp->req->sav->sah->saidx.proto &&
2317 bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
2318 sizeof (union sockaddr_union)) == 0) {
2319 /*
2320 * No IPsec processing is needed, free
2321 * reference to SP.
2322 *
2323 * NB: null pointer to avoid free at
2324 * done: below.
2325 */
2326 KEY_FREESP(&sp), sp = NULL;
2327 needipsec = 0;
2328 splx(s);
2329 goto skippolicycheck;
2330 }
2331 }
2332 splx(s);
2333 needipsec = 1;
2334 }
2335 skippolicycheck:;
2336
2337 *errorp = error;
2338 *needipsecp = needipsec;
2339 return sp;
2340 }
2341 #endif
2342
2343
2344
2345 /* XXX this stuff doesn't belong here... */
2346
2347 static struct xformsw* xforms = NULL;
2348
2349 /*
2350 * Register a transform; typically at system startup.
2351 */
2352 void
2353 xform_register(struct xformsw* xsp)
2354 {
2355 xsp->xf_next = xforms;
2356 xforms = xsp;
2357 }
2358
2359 /*
2360 * Initialize transform support in an sav.
2361 */
2362 int
2363 xform_init(struct secasvar *sav, int xftype)
2364 {
2365 struct xformsw *xsp;
2366
2367 if (sav->tdb_xform != NULL) /* previously initialized */
2368 return 0;
2369 for (xsp = xforms; xsp; xsp = xsp->xf_next)
2370 if (xsp->xf_type == xftype)
2371 return (*xsp->xf_init)(sav, xsp);
2372
2373 DPRINTF(("xform_init: no match for xform type %d\n", xftype));
2374 return EINVAL;
2375 }
2376
2377 #ifdef __NetBSD__
2378 void
2379 ipsec_attach(void)
2380 {
2381 printf("initializing IPsec...");
2382 ah_attach();
2383 esp_attach();
2384 ipcomp_attach();
2385 ipe4_attach();
2386 #ifdef TCP_SIGNATURE
2387 tcpsignature_attach();
2388 #endif
2389 printf(" done\n");
2390 }
2391 #endif /* __NetBSD__ */
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