FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $FreeBSD: releng/7.4/sys/netipsec/ipsec.c 215366 2010-11-16 03:20:57Z bz $ */
2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * IPsec controller part.
35 */
36
37 #include "opt_inet.h"
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/domain.h>
46 #include <sys/priv.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/errno.h>
51 #include <sys/time.h>
52 #include <sys/kernel.h>
53 #include <sys/syslog.h>
54 #include <sys/sysctl.h>
55 #include <sys/proc.h>
56
57 #include <net/if.h>
58 #include <net/route.h>
59
60 #include <netinet/in.h>
61 #include <netinet/in_systm.h>
62 #include <netinet/ip.h>
63 #include <netinet/ip_var.h>
64 #include <netinet/in_var.h>
65 #include <netinet/udp.h>
66 #include <netinet/udp_var.h>
67 #include <netinet/tcp.h>
68 #include <netinet/udp.h>
69
70 #include <netinet/ip6.h>
71 #ifdef INET6
72 #include <netinet6/ip6_var.h>
73 #endif
74 #include <netinet/in_pcb.h>
75 #ifdef INET6
76 #include <netinet/icmp6.h>
77 #endif
78
79 #include <sys/types.h>
80 #include <netipsec/ipsec.h>
81 #ifdef INET6
82 #include <netipsec/ipsec6.h>
83 #endif
84 #include <netipsec/ah_var.h>
85 #include <netipsec/esp_var.h>
86 #include <netipsec/ipcomp.h> /*XXX*/
87 #include <netipsec/ipcomp_var.h>
88
89 #include <netipsec/key.h>
90 #include <netipsec/keydb.h>
91 #include <netipsec/key_debug.h>
92
93 #include <netipsec/xform.h>
94
95 #include <machine/in_cksum.h>
96
97 #include <opencrypto/cryptodev.h>
98
99 #ifdef IPSEC_DEBUG
100 int ipsec_debug = 1;
101 #else
102 int ipsec_debug = 0;
103 #endif
104
105 /* NB: name changed so netstat doesn't use it */
106 struct ipsecstat ipsec4stat;
107 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
108 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
109 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
110 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
111 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
112 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
113 struct secpolicy ip4_def_policy;
114 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
115 int ip4_esp_randpad = -1;
116 /*
117 * Crypto support requirements:
118 *
119 * 1 require hardware support
120 * -1 require software support
121 * 0 take anything
122 */
123 int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
124
125 FEATURE(ipsec, "Internet Protocol Security (IPsec)");
126
127 SYSCTL_DECL(_net_inet_ipsec);
128
129 /* net.inet.ipsec */
130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
131 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
133 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
135 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
137 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
139 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
141 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
143 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
145 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
147 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
149 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
150 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
151 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
152 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
153 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
154 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
155 ipsecstats, CTLFLAG_RD, &ipsec4stat, ipsecstat, "");
156
157 #ifdef REGRESSION
158 /*
159 * When set to 1, IPsec will send packets with the same sequence number.
160 * This allows to verify if the other side has proper replay attacks detection.
161 */
162 int ipsec_replay = 0;
163 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
164 "Emulate replay attack");
165 /*
166 * When set 1, IPsec will send packets with corrupted HMAC.
167 * This allows to verify if the other side properly detects modified packets.
168 */
169 int ipsec_integrity = 0;
170 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
171 &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
172 #endif
173
174 #ifdef INET6
175 struct ipsecstat ipsec6stat;
176 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
177 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
178 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
179 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
180 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
181 int ip6_esp_randpad = -1;
182
183 SYSCTL_DECL(_net_inet6_ipsec6);
184
185 /* net.inet6.ipsec6 */
186 #ifdef COMPAT_KAME
187 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
188 0,0, compat_ipsecstats_sysctl, "S", "");
189 #endif /* COMPAT_KAME */
190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
191 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
193 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
195 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
197 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
199 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
201 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
202 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
203 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
204 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
205 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
206 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
207 ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
208 #endif /* INET6 */
209
210 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
211 #ifdef INET6
212 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct inpcb *pcb));
213 #endif
214 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
215 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
216 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
217 #ifdef INET6
218 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
219 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
220 #endif
221 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
222 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
223 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
224 int optname, caddr_t request, size_t len, struct ucred *cred));
225 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
226 static void vshiftl __P((unsigned char *, int, int));
227 static size_t ipsec_hdrsiz __P((struct secpolicy *));
228
229 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
230
231 /*
232 * Return a held reference to the default SP.
233 */
234 static struct secpolicy *
235 key_allocsp_default(const char* where, int tag)
236 {
237 struct secpolicy *sp;
238
239 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
240 printf("DP key_allocsp_default from %s:%u\n", where, tag));
241
242 sp = &ip4_def_policy;
243 if (sp->policy != IPSEC_POLICY_DISCARD &&
244 sp->policy != IPSEC_POLICY_NONE) {
245 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
246 sp->policy, IPSEC_POLICY_NONE));
247 sp->policy = IPSEC_POLICY_NONE;
248 }
249 key_addref(sp);
250
251 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
252 printf("DP key_allocsp_default returns SP:%p (%u)\n",
253 sp, sp->refcnt));
254 return sp;
255 }
256 #define KEY_ALLOCSP_DEFAULT() \
257 key_allocsp_default(__FILE__, __LINE__)
258
259 /*
260 * For OUTBOUND packet having a socket. Searching SPD for packet,
261 * and return a pointer to SP.
262 * OUT: NULL: no apropreate SP found, the following value is set to error.
263 * 0 : bypass
264 * EACCES : discard packet.
265 * ENOENT : ipsec_acquire() in progress, maybe.
266 * others : error occured.
267 * others: a pointer to SP
268 *
269 * NOTE: IPv6 mapped adddress concern is implemented here.
270 */
271 struct secpolicy *
272 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
273 {
274 struct secpolicy *sp;
275
276 IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
277 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
278 ("invalid direction %u", dir));
279
280 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
281 if (sp == NULL) /*XXX????*/
282 sp = KEY_ALLOCSP_DEFAULT();
283 IPSEC_ASSERT(sp != NULL, ("null SP"));
284 return sp;
285 }
286
287 /*
288 * For OUTBOUND packet having a socket. Searching SPD for packet,
289 * and return a pointer to SP.
290 * OUT: NULL: no apropreate SP found, the following value is set to error.
291 * 0 : bypass
292 * EACCES : discard packet.
293 * ENOENT : ipsec_acquire() in progress, maybe.
294 * others : error occured.
295 * others: a pointer to SP
296 *
297 * NOTE: IPv6 mapped adddress concern is implemented here.
298 */
299 struct secpolicy *
300 ipsec_getpolicybysock(m, dir, inp, error)
301 struct mbuf *m;
302 u_int dir;
303 struct inpcb *inp;
304 int *error;
305 {
306 struct inpcbpolicy *pcbsp = NULL;
307 struct secpolicy *currsp = NULL; /* policy on socket */
308 struct secpolicy *sp;
309
310 IPSEC_ASSERT(m != NULL, ("null mbuf"));
311 IPSEC_ASSERT(inp != NULL, ("null inpcb"));
312 IPSEC_ASSERT(error != NULL, ("null error"));
313 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
314 ("invalid direction %u", dir));
315
316 /* set spidx in pcb */
317 if (inp->inp_vflag & INP_IPV6PROTO) {
318 #ifdef INET6
319 *error = ipsec6_setspidx_in6pcb(m, inp);
320 pcbsp = inp->inp_sp;
321 #else
322 *error = EINVAL; /* should not happen */
323 #endif
324 } else {
325 *error = ipsec4_setspidx_inpcb(m, inp);
326 pcbsp = inp->inp_sp;
327 }
328 if (*error)
329 return NULL;
330
331 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
332 switch (dir) {
333 case IPSEC_DIR_INBOUND:
334 currsp = pcbsp->sp_in;
335 break;
336 case IPSEC_DIR_OUTBOUND:
337 currsp = pcbsp->sp_out;
338 break;
339 }
340 IPSEC_ASSERT(currsp != NULL, ("null currsp"));
341
342 if (pcbsp->priv) { /* when privilieged socket */
343 switch (currsp->policy) {
344 case IPSEC_POLICY_BYPASS:
345 case IPSEC_POLICY_IPSEC:
346 key_addref(currsp);
347 sp = currsp;
348 break;
349
350 case IPSEC_POLICY_ENTRUST:
351 /* look for a policy in SPD */
352 sp = KEY_ALLOCSP(&currsp->spidx, dir);
353 if (sp == NULL) /* no SP found */
354 sp = KEY_ALLOCSP_DEFAULT();
355 break;
356
357 default:
358 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
359 __func__, currsp->policy));
360 *error = EINVAL;
361 return NULL;
362 }
363 } else { /* unpriv, SPD has policy */
364 sp = KEY_ALLOCSP(&currsp->spidx, dir);
365 if (sp == NULL) { /* no SP found */
366 switch (currsp->policy) {
367 case IPSEC_POLICY_BYPASS:
368 ipseclog((LOG_ERR, "%s: Illegal policy for "
369 "non-priviliged defined %d\n",
370 __func__, currsp->policy));
371 *error = EINVAL;
372 return NULL;
373
374 case IPSEC_POLICY_ENTRUST:
375 sp = KEY_ALLOCSP_DEFAULT();
376 break;
377
378 case IPSEC_POLICY_IPSEC:
379 key_addref(currsp);
380 sp = currsp;
381 break;
382
383 default:
384 ipseclog((LOG_ERR, "%s: Invalid policy for "
385 "PCB %d\n", __func__, currsp->policy));
386 *error = EINVAL;
387 return NULL;
388 }
389 }
390 }
391 IPSEC_ASSERT(sp != NULL,
392 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
393 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
394 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
395 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
396 return sp;
397 }
398
399 /*
400 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
401 * and return a pointer to SP.
402 * OUT: positive: a pointer to the entry for security policy leaf matched.
403 * NULL: no apropreate SP found, the following value is set to error.
404 * 0 : bypass
405 * EACCES : discard packet.
406 * ENOENT : ipsec_acquire() in progress, maybe.
407 * others : error occured.
408 */
409 struct secpolicy *
410 ipsec_getpolicybyaddr(m, dir, flag, error)
411 struct mbuf *m;
412 u_int dir;
413 int flag;
414 int *error;
415 {
416 struct secpolicyindex spidx;
417 struct secpolicy *sp;
418
419 IPSEC_ASSERT(m != NULL, ("null mbuf"));
420 IPSEC_ASSERT(error != NULL, ("null error"));
421 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
422 ("invalid direction %u", dir));
423
424 sp = NULL;
425 if (key_havesp(dir)) {
426 /* Make an index to look for a policy. */
427 *error = ipsec_setspidx(m, &spidx,
428 (flag & IP_FORWARDING) ? 0 : 1);
429 if (*error != 0) {
430 DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
431 __func__, dir, flag));
432 return NULL;
433 }
434 spidx.dir = dir;
435
436 sp = KEY_ALLOCSP(&spidx, dir);
437 }
438 if (sp == NULL) /* no SP found, use system default */
439 sp = KEY_ALLOCSP_DEFAULT();
440 IPSEC_ASSERT(sp != NULL, ("null SP"));
441 return sp;
442 }
443
444 struct secpolicy *
445 ipsec4_checkpolicy(m, dir, flag, error, inp)
446 struct mbuf *m;
447 u_int dir, flag;
448 int *error;
449 struct inpcb *inp;
450 {
451 struct secpolicy *sp;
452
453 *error = 0;
454 if (inp == NULL)
455 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
456 else
457 sp = ipsec_getpolicybysock(m, dir, inp, error);
458 if (sp == NULL) {
459 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
460 ipsec4stat.ips_out_inval++;
461 return NULL;
462 }
463 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
464 switch (sp->policy) {
465 case IPSEC_POLICY_ENTRUST:
466 default:
467 printf("%s: invalid policy %u\n", __func__, sp->policy);
468 /* fall thru... */
469 case IPSEC_POLICY_DISCARD:
470 ipsec4stat.ips_out_polvio++;
471 *error = -EINVAL; /* packet is discarded by caller */
472 break;
473 case IPSEC_POLICY_BYPASS:
474 case IPSEC_POLICY_NONE:
475 KEY_FREESP(&sp);
476 sp = NULL; /* NB: force NULL result */
477 break;
478 case IPSEC_POLICY_IPSEC:
479 if (sp->req == NULL) /* acquire an SA */
480 *error = key_spdacquire(sp);
481 break;
482 }
483 if (*error != 0) {
484 KEY_FREESP(&sp);
485 sp = NULL;
486 }
487 return sp;
488 }
489
490 static int
491 ipsec4_setspidx_inpcb(m, pcb)
492 struct mbuf *m;
493 struct inpcb *pcb;
494 {
495 int error;
496
497 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
498 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
499 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
500 ("null sp_in || sp_out"));
501
502 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
503 if (error == 0) {
504 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
505 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
506 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
507 } else {
508 bzero(&pcb->inp_sp->sp_in->spidx,
509 sizeof (pcb->inp_sp->sp_in->spidx));
510 bzero(&pcb->inp_sp->sp_out->spidx,
511 sizeof (pcb->inp_sp->sp_in->spidx));
512 }
513 return error;
514 }
515
516 #ifdef INET6
517 static int
518 ipsec6_setspidx_in6pcb(m, pcb)
519 struct mbuf *m;
520 struct inpcb *pcb;
521 {
522 struct secpolicyindex *spidx;
523 int error;
524
525 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
526 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
527 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
528 ("null sp_in || sp_out"));
529
530 bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
531 bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
532
533 spidx = &pcb->inp_sp->sp_in->spidx;
534 error = ipsec_setspidx(m, spidx, 1);
535 if (error)
536 goto bad;
537 spidx->dir = IPSEC_DIR_INBOUND;
538
539 spidx = &pcb->inp_sp->sp_out->spidx;
540 error = ipsec_setspidx(m, spidx, 1);
541 if (error)
542 goto bad;
543 spidx->dir = IPSEC_DIR_OUTBOUND;
544
545 return 0;
546
547 bad:
548 bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
549 bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
550 return error;
551 }
552 #endif
553
554 /*
555 * configure security policy index (src/dst/proto/sport/dport)
556 * by looking at the content of mbuf.
557 * the caller is responsible for error recovery (like clearing up spidx).
558 */
559 static int
560 ipsec_setspidx(m, spidx, needport)
561 struct mbuf *m;
562 struct secpolicyindex *spidx;
563 int needport;
564 {
565 struct ip *ip = NULL;
566 struct ip ipbuf;
567 u_int v;
568 struct mbuf *n;
569 int len;
570 int error;
571
572 IPSEC_ASSERT(m != NULL, ("null mbuf"));
573
574 /*
575 * validate m->m_pkthdr.len. we see incorrect length if we
576 * mistakenly call this function with inconsistent mbuf chain
577 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
578 */
579 len = 0;
580 for (n = m; n; n = n->m_next)
581 len += n->m_len;
582 if (m->m_pkthdr.len != len) {
583 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
584 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
585 __func__, len, m->m_pkthdr.len));
586 return EINVAL;
587 }
588
589 if (m->m_pkthdr.len < sizeof(struct ip)) {
590 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
591 printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
592 __func__, m->m_pkthdr.len));
593 return EINVAL;
594 }
595
596 if (m->m_len >= sizeof(*ip))
597 ip = mtod(m, struct ip *);
598 else {
599 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
600 ip = &ipbuf;
601 }
602 #ifdef _IP_VHL
603 v = _IP_VHL_V(ip->ip_vhl);
604 #else
605 v = ip->ip_v;
606 #endif
607 switch (v) {
608 case 4:
609 error = ipsec4_setspidx_ipaddr(m, spidx);
610 if (error)
611 return error;
612 ipsec4_get_ulp(m, spidx, needport);
613 return 0;
614 #ifdef INET6
615 case 6:
616 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
617 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
618 printf("%s: pkthdr len(%d) too small (v6), "
619 "ignored\n", __func__, m->m_pkthdr.len));
620 return EINVAL;
621 }
622 error = ipsec6_setspidx_ipaddr(m, spidx);
623 if (error)
624 return error;
625 ipsec6_get_ulp(m, spidx, needport);
626 return 0;
627 #endif
628 default:
629 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
630 printf("%s: " "unknown IP version %u, ignored.\n",
631 __func__, v));
632 return EINVAL;
633 }
634 }
635
636 static void
637 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
638 {
639 u_int8_t nxt;
640 int off;
641
642 /* sanity check */
643 IPSEC_ASSERT(m != NULL, ("null mbuf"));
644 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
645
646 /* NB: ip_input() flips it into host endian XXX need more checking */
647 if (m->m_len < sizeof (struct ip)) {
648 struct ip *ip = mtod(m, struct ip *);
649 if (ip->ip_off & (IP_MF | IP_OFFMASK))
650 goto done;
651 #ifdef _IP_VHL
652 off = _IP_VHL_HL(ip->ip_vhl) << 2;
653 #else
654 off = ip->ip_hl << 2;
655 #endif
656 nxt = ip->ip_p;
657 } else {
658 struct ip ih;
659
660 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
661 if (ih.ip_off & (IP_MF | IP_OFFMASK))
662 goto done;
663 #ifdef _IP_VHL
664 off = _IP_VHL_HL(ih.ip_vhl) << 2;
665 #else
666 off = ih.ip_hl << 2;
667 #endif
668 nxt = ih.ip_p;
669 }
670
671 while (off < m->m_pkthdr.len) {
672 struct ip6_ext ip6e;
673 struct tcphdr th;
674 struct udphdr uh;
675
676 switch (nxt) {
677 case IPPROTO_TCP:
678 spidx->ul_proto = nxt;
679 if (!needport)
680 goto done_proto;
681 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
682 goto done;
683 m_copydata(m, off, sizeof (th), (caddr_t) &th);
684 spidx->src.sin.sin_port = th.th_sport;
685 spidx->dst.sin.sin_port = th.th_dport;
686 return;
687 case IPPROTO_UDP:
688 spidx->ul_proto = nxt;
689 if (!needport)
690 goto done_proto;
691 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
692 goto done;
693 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
694 spidx->src.sin.sin_port = uh.uh_sport;
695 spidx->dst.sin.sin_port = uh.uh_dport;
696 return;
697 case IPPROTO_AH:
698 if (off + sizeof(ip6e) > m->m_pkthdr.len)
699 goto done;
700 /* XXX sigh, this works but is totally bogus */
701 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
702 off += (ip6e.ip6e_len + 2) << 2;
703 nxt = ip6e.ip6e_nxt;
704 break;
705 case IPPROTO_ICMP:
706 default:
707 /* XXX intermediate headers??? */
708 spidx->ul_proto = nxt;
709 goto done_proto;
710 }
711 }
712 done:
713 spidx->ul_proto = IPSEC_ULPROTO_ANY;
714 done_proto:
715 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
716 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
717 }
718
719 /* assumes that m is sane */
720 static int
721 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
722 {
723 static const struct sockaddr_in template = {
724 sizeof (struct sockaddr_in),
725 AF_INET,
726 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
727 };
728
729 spidx->src.sin = template;
730 spidx->dst.sin = template;
731
732 if (m->m_len < sizeof (struct ip)) {
733 m_copydata(m, offsetof(struct ip, ip_src),
734 sizeof (struct in_addr),
735 (caddr_t) &spidx->src.sin.sin_addr);
736 m_copydata(m, offsetof(struct ip, ip_dst),
737 sizeof (struct in_addr),
738 (caddr_t) &spidx->dst.sin.sin_addr);
739 } else {
740 struct ip *ip = mtod(m, struct ip *);
741 spidx->src.sin.sin_addr = ip->ip_src;
742 spidx->dst.sin.sin_addr = ip->ip_dst;
743 }
744
745 spidx->prefs = sizeof(struct in_addr) << 3;
746 spidx->prefd = sizeof(struct in_addr) << 3;
747
748 return 0;
749 }
750
751 #ifdef INET6
752 static void
753 ipsec6_get_ulp(m, spidx, needport)
754 struct mbuf *m;
755 struct secpolicyindex *spidx;
756 int needport;
757 {
758 int off, nxt;
759 struct tcphdr th;
760 struct udphdr uh;
761 struct icmp6_hdr ih;
762
763 /* sanity check */
764 if (m == NULL)
765 panic("%s: NULL pointer was passed.\n", __func__);
766
767 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
768 printf("%s:\n", __func__); kdebug_mbuf(m));
769
770 /* set default */
771 spidx->ul_proto = IPSEC_ULPROTO_ANY;
772 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
773 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
774
775 nxt = -1;
776 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
777 if (off < 0 || m->m_pkthdr.len < off)
778 return;
779
780 switch (nxt) {
781 case IPPROTO_TCP:
782 spidx->ul_proto = nxt;
783 if (!needport)
784 break;
785 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
786 break;
787 m_copydata(m, off, sizeof(th), (caddr_t)&th);
788 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
789 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
790 break;
791 case IPPROTO_UDP:
792 spidx->ul_proto = nxt;
793 if (!needport)
794 break;
795 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
796 break;
797 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
798 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
799 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
800 break;
801 case IPPROTO_ICMPV6:
802 spidx->ul_proto = nxt;
803 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
804 break;
805 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
806 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
807 htons((uint16_t)ih.icmp6_type);
808 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
809 htons((uint16_t)ih.icmp6_code);
810 break;
811 default:
812 /* XXX intermediate headers??? */
813 spidx->ul_proto = nxt;
814 break;
815 }
816 }
817
818 /* assumes that m is sane */
819 static int
820 ipsec6_setspidx_ipaddr(m, spidx)
821 struct mbuf *m;
822 struct secpolicyindex *spidx;
823 {
824 struct ip6_hdr *ip6 = NULL;
825 struct ip6_hdr ip6buf;
826 struct sockaddr_in6 *sin6;
827
828 if (m->m_len >= sizeof(*ip6))
829 ip6 = mtod(m, struct ip6_hdr *);
830 else {
831 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
832 ip6 = &ip6buf;
833 }
834
835 sin6 = (struct sockaddr_in6 *)&spidx->src;
836 bzero(sin6, sizeof(*sin6));
837 sin6->sin6_family = AF_INET6;
838 sin6->sin6_len = sizeof(struct sockaddr_in6);
839 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
840 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
841 sin6->sin6_addr.s6_addr16[1] = 0;
842 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
843 }
844 spidx->prefs = sizeof(struct in6_addr) << 3;
845
846 sin6 = (struct sockaddr_in6 *)&spidx->dst;
847 bzero(sin6, sizeof(*sin6));
848 sin6->sin6_family = AF_INET6;
849 sin6->sin6_len = sizeof(struct sockaddr_in6);
850 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
851 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
852 sin6->sin6_addr.s6_addr16[1] = 0;
853 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
854 }
855 spidx->prefd = sizeof(struct in6_addr) << 3;
856
857 return 0;
858 }
859 #endif
860
861 static void
862 ipsec_delpcbpolicy(p)
863 struct inpcbpolicy *p;
864 {
865 free(p, M_IPSEC_INPCB);
866 }
867
868 /* initialize policy in PCB */
869 int
870 ipsec_init_policy(so, pcb_sp)
871 struct socket *so;
872 struct inpcbpolicy **pcb_sp;
873 {
874 struct inpcbpolicy *new;
875
876 /* sanity check. */
877 if (so == NULL || pcb_sp == NULL)
878 panic("%s: NULL pointer was passed.\n", __func__);
879
880 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
881 M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
882 if (new == NULL) {
883 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
884 return ENOBUFS;
885 }
886
887 new->priv = IPSEC_IS_PRIVILEGED_SO(so);
888
889 if ((new->sp_in = KEY_NEWSP()) == NULL) {
890 ipsec_delpcbpolicy(new);
891 return ENOBUFS;
892 }
893 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
894 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
895
896 if ((new->sp_out = KEY_NEWSP()) == NULL) {
897 KEY_FREESP(&new->sp_in);
898 ipsec_delpcbpolicy(new);
899 return ENOBUFS;
900 }
901 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
902 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
903
904 *pcb_sp = new;
905
906 return 0;
907 }
908
909 /* copy old ipsec policy into new */
910 int
911 ipsec_copy_policy(old, new)
912 struct inpcbpolicy *old, *new;
913 {
914 struct secpolicy *sp;
915
916 sp = ipsec_deepcopy_policy(old->sp_in);
917 if (sp) {
918 KEY_FREESP(&new->sp_in);
919 new->sp_in = sp;
920 } else
921 return ENOBUFS;
922
923 sp = ipsec_deepcopy_policy(old->sp_out);
924 if (sp) {
925 KEY_FREESP(&new->sp_out);
926 new->sp_out = sp;
927 } else
928 return ENOBUFS;
929
930 new->priv = old->priv;
931
932 return 0;
933 }
934
935 struct ipsecrequest *
936 ipsec_newisr(void)
937 {
938 struct ipsecrequest *p;
939
940 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
941 if (p != NULL)
942 IPSECREQUEST_LOCK_INIT(p);
943 return p;
944 }
945
946 void
947 ipsec_delisr(struct ipsecrequest *p)
948 {
949 IPSECREQUEST_LOCK_DESTROY(p);
950 free(p, M_IPSEC_SR);
951 }
952
953 /* deep-copy a policy in PCB */
954 static struct secpolicy *
955 ipsec_deepcopy_policy(src)
956 struct secpolicy *src;
957 {
958 struct ipsecrequest *newchain = NULL;
959 struct ipsecrequest *p;
960 struct ipsecrequest **q;
961 struct ipsecrequest *r;
962 struct secpolicy *dst;
963
964 if (src == NULL)
965 return NULL;
966 dst = KEY_NEWSP();
967 if (dst == NULL)
968 return NULL;
969
970 /*
971 * deep-copy IPsec request chain. This is required since struct
972 * ipsecrequest is not reference counted.
973 */
974 q = &newchain;
975 for (p = src->req; p; p = p->next) {
976 *q = ipsec_newisr();
977 if (*q == NULL)
978 goto fail;
979 (*q)->saidx.proto = p->saidx.proto;
980 (*q)->saidx.mode = p->saidx.mode;
981 (*q)->level = p->level;
982 (*q)->saidx.reqid = p->saidx.reqid;
983
984 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
985 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
986
987 (*q)->sp = dst;
988
989 q = &((*q)->next);
990 }
991
992 dst->req = newchain;
993 dst->state = src->state;
994 dst->policy = src->policy;
995 /* do not touch the refcnt fields */
996
997 return dst;
998
999 fail:
1000 for (p = newchain; p; p = r) {
1001 r = p->next;
1002 ipsec_delisr(p);
1003 p = NULL;
1004 }
1005 return NULL;
1006 }
1007
1008 /* set policy and ipsec request if present. */
1009 static int
1010 ipsec_set_policy(pcb_sp, optname, request, len, cred)
1011 struct secpolicy **pcb_sp;
1012 int optname;
1013 caddr_t request;
1014 size_t len;
1015 struct ucred *cred;
1016 {
1017 struct sadb_x_policy *xpl;
1018 struct secpolicy *newsp = NULL;
1019 int error;
1020
1021 /* sanity check. */
1022 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1023 return EINVAL;
1024 if (len < sizeof(*xpl))
1025 return EINVAL;
1026 xpl = (struct sadb_x_policy *)request;
1027
1028 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1029 printf("%s: passed policy\n", __func__);
1030 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1031
1032 /* check policy type */
1033 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1034 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1035 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1036 return EINVAL;
1037
1038 /* check privileged socket */
1039 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1040 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0);
1041 if (error)
1042 return EACCES;
1043 }
1044
1045 /* allocation new SP entry */
1046 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1047 return error;
1048
1049 newsp->state = IPSEC_SPSTATE_ALIVE;
1050
1051 /* clear old SP and set new SP */
1052 KEY_FREESP(pcb_sp);
1053 *pcb_sp = newsp;
1054 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1055 printf("%s: new policy\n", __func__);
1056 kdebug_secpolicy(newsp));
1057
1058 return 0;
1059 }
1060
1061 static int
1062 ipsec_get_policy(pcb_sp, mp)
1063 struct secpolicy *pcb_sp;
1064 struct mbuf **mp;
1065 {
1066
1067 /* sanity check. */
1068 if (pcb_sp == NULL || mp == NULL)
1069 return EINVAL;
1070
1071 *mp = key_sp2msg(pcb_sp);
1072 if (!*mp) {
1073 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
1074 return ENOBUFS;
1075 }
1076
1077 (*mp)->m_type = MT_DATA;
1078 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1079 printf("%s:\n", __func__); kdebug_mbuf(*mp));
1080
1081 return 0;
1082 }
1083
1084 int
1085 ipsec4_set_policy(inp, optname, request, len, cred)
1086 struct inpcb *inp;
1087 int optname;
1088 caddr_t request;
1089 size_t len;
1090 struct ucred *cred;
1091 {
1092 struct sadb_x_policy *xpl;
1093 struct secpolicy **pcb_sp;
1094
1095 /* sanity check. */
1096 if (inp == NULL || request == NULL)
1097 return EINVAL;
1098 if (len < sizeof(*xpl))
1099 return EINVAL;
1100 xpl = (struct sadb_x_policy *)request;
1101
1102 /* select direction */
1103 switch (xpl->sadb_x_policy_dir) {
1104 case IPSEC_DIR_INBOUND:
1105 pcb_sp = &inp->inp_sp->sp_in;
1106 break;
1107 case IPSEC_DIR_OUTBOUND:
1108 pcb_sp = &inp->inp_sp->sp_out;
1109 break;
1110 default:
1111 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1112 xpl->sadb_x_policy_dir));
1113 return EINVAL;
1114 }
1115
1116 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1117 }
1118
1119 int
1120 ipsec4_get_policy(inp, request, len, mp)
1121 struct inpcb *inp;
1122 caddr_t request;
1123 size_t len;
1124 struct mbuf **mp;
1125 {
1126 struct sadb_x_policy *xpl;
1127 struct secpolicy *pcb_sp;
1128
1129 /* sanity check. */
1130 if (inp == NULL || request == NULL || mp == NULL)
1131 return EINVAL;
1132 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
1133 if (len < sizeof(*xpl))
1134 return EINVAL;
1135 xpl = (struct sadb_x_policy *)request;
1136
1137 /* select direction */
1138 switch (xpl->sadb_x_policy_dir) {
1139 case IPSEC_DIR_INBOUND:
1140 pcb_sp = inp->inp_sp->sp_in;
1141 break;
1142 case IPSEC_DIR_OUTBOUND:
1143 pcb_sp = inp->inp_sp->sp_out;
1144 break;
1145 default:
1146 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1147 xpl->sadb_x_policy_dir));
1148 return EINVAL;
1149 }
1150
1151 return ipsec_get_policy(pcb_sp, mp);
1152 }
1153
1154 /* delete policy in PCB */
1155 int
1156 ipsec_delete_pcbpolicy(inp)
1157 struct inpcb *inp;
1158 {
1159 IPSEC_ASSERT(inp != NULL, ("null inp"));
1160
1161 if (inp->inp_sp == NULL)
1162 return 0;
1163
1164 if (inp->inp_sp->sp_in != NULL)
1165 KEY_FREESP(&inp->inp_sp->sp_in);
1166
1167 if (inp->inp_sp->sp_out != NULL)
1168 KEY_FREESP(&inp->inp_sp->sp_out);
1169
1170 ipsec_delpcbpolicy(inp->inp_sp);
1171 inp->inp_sp = NULL;
1172
1173 return 0;
1174 }
1175
1176 #ifdef INET6
1177 int
1178 ipsec6_set_policy(in6p, optname, request, len, cred)
1179 struct inpcb *in6p;
1180 int optname;
1181 caddr_t request;
1182 size_t len;
1183 struct ucred *cred;
1184 {
1185 struct sadb_x_policy *xpl;
1186 struct secpolicy **pcb_sp;
1187
1188 /* sanity check. */
1189 if (in6p == NULL || request == NULL)
1190 return EINVAL;
1191 if (len < sizeof(*xpl))
1192 return EINVAL;
1193 xpl = (struct sadb_x_policy *)request;
1194
1195 /* select direction */
1196 switch (xpl->sadb_x_policy_dir) {
1197 case IPSEC_DIR_INBOUND:
1198 pcb_sp = &in6p->inp_sp->sp_in;
1199 break;
1200 case IPSEC_DIR_OUTBOUND:
1201 pcb_sp = &in6p->inp_sp->sp_out;
1202 break;
1203 default:
1204 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1205 xpl->sadb_x_policy_dir));
1206 return EINVAL;
1207 }
1208
1209 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1210 }
1211
1212 int
1213 ipsec6_get_policy(in6p, request, len, mp)
1214 struct inpcb *in6p;
1215 caddr_t request;
1216 size_t len;
1217 struct mbuf **mp;
1218 {
1219 struct sadb_x_policy *xpl;
1220 struct secpolicy *pcb_sp;
1221
1222 /* sanity check. */
1223 if (in6p == NULL || request == NULL || mp == NULL)
1224 return EINVAL;
1225 IPSEC_ASSERT(in6p->inp_sp != NULL, ("null inp_sp"));
1226 if (len < sizeof(*xpl))
1227 return EINVAL;
1228 xpl = (struct sadb_x_policy *)request;
1229
1230 /* select direction */
1231 switch (xpl->sadb_x_policy_dir) {
1232 case IPSEC_DIR_INBOUND:
1233 pcb_sp = in6p->inp_sp->sp_in;
1234 break;
1235 case IPSEC_DIR_OUTBOUND:
1236 pcb_sp = in6p->inp_sp->sp_out;
1237 break;
1238 default:
1239 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1240 xpl->sadb_x_policy_dir));
1241 return EINVAL;
1242 }
1243
1244 return ipsec_get_policy(pcb_sp, mp);
1245 }
1246 #endif
1247
1248 /*
1249 * return current level.
1250 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1251 */
1252 u_int
1253 ipsec_get_reqlevel(isr)
1254 struct ipsecrequest *isr;
1255 {
1256 u_int level = 0;
1257 u_int esp_trans_deflev, esp_net_deflev;
1258 u_int ah_trans_deflev, ah_net_deflev;
1259
1260 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1261 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1262 ("af family mismatch, src %u, dst %u",
1263 isr->sp->spidx.src.sa.sa_family,
1264 isr->sp->spidx.dst.sa.sa_family));
1265
1266 /* XXX note that we have ipseclog() expanded here - code sync issue */
1267 #define IPSEC_CHECK_DEFAULT(lev) \
1268 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1269 && (lev) != IPSEC_LEVEL_UNIQUE) \
1270 ? (ipsec_debug \
1271 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1272 (lev), IPSEC_LEVEL_REQUIRE) \
1273 : 0), \
1274 (lev) = IPSEC_LEVEL_REQUIRE, \
1275 (lev) \
1276 : (lev))
1277
1278 /* set default level */
1279 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1280 #ifdef INET
1281 case AF_INET:
1282 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1283 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1284 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1285 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1286 break;
1287 #endif
1288 #ifdef INET6
1289 case AF_INET6:
1290 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1291 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1292 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1293 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1294 break;
1295 #endif /* INET6 */
1296 default:
1297 panic("%s: unknown af %u",
1298 __func__, isr->sp->spidx.src.sa.sa_family);
1299 }
1300
1301 #undef IPSEC_CHECK_DEFAULT
1302
1303 /* set level */
1304 switch (isr->level) {
1305 case IPSEC_LEVEL_DEFAULT:
1306 switch (isr->saidx.proto) {
1307 case IPPROTO_ESP:
1308 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1309 level = esp_net_deflev;
1310 else
1311 level = esp_trans_deflev;
1312 break;
1313 case IPPROTO_AH:
1314 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1315 level = ah_net_deflev;
1316 else
1317 level = ah_trans_deflev;
1318 break;
1319 case IPPROTO_IPCOMP:
1320 /*
1321 * we don't really care, as IPcomp document says that
1322 * we shouldn't compress small packets
1323 */
1324 level = IPSEC_LEVEL_USE;
1325 break;
1326 default:
1327 panic("%s: Illegal protocol defined %u\n", __func__,
1328 isr->saidx.proto);
1329 }
1330 break;
1331
1332 case IPSEC_LEVEL_USE:
1333 case IPSEC_LEVEL_REQUIRE:
1334 level = isr->level;
1335 break;
1336 case IPSEC_LEVEL_UNIQUE:
1337 level = IPSEC_LEVEL_REQUIRE;
1338 break;
1339
1340 default:
1341 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1342 }
1343
1344 return level;
1345 }
1346
1347 /*
1348 * Check security policy requirements against the actual
1349 * packet contents. Return one if the packet should be
1350 * reject as "invalid"; otherwiser return zero to have the
1351 * packet treated as "valid".
1352 *
1353 * OUT:
1354 * 0: valid
1355 * 1: invalid
1356 */
1357 int
1358 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1359 {
1360 struct ipsecrequest *isr;
1361 int need_auth;
1362
1363 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1364 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1365
1366 /* check policy */
1367 switch (sp->policy) {
1368 case IPSEC_POLICY_DISCARD:
1369 return 1;
1370 case IPSEC_POLICY_BYPASS:
1371 case IPSEC_POLICY_NONE:
1372 return 0;
1373 }
1374
1375 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1376 ("invalid policy %u", sp->policy));
1377
1378 /* XXX should compare policy against ipsec header history */
1379
1380 need_auth = 0;
1381 for (isr = sp->req; isr != NULL; isr = isr->next) {
1382 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1383 continue;
1384 switch (isr->saidx.proto) {
1385 case IPPROTO_ESP:
1386 if ((m->m_flags & M_DECRYPTED) == 0) {
1387 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1388 printf("%s: ESP m_flags:%x\n", __func__,
1389 m->m_flags));
1390 return 1;
1391 }
1392
1393 if (!need_auth &&
1394 isr->sav != NULL &&
1395 isr->sav->tdb_authalgxform != NULL &&
1396 (m->m_flags & M_AUTHIPDGM) == 0) {
1397 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1398 printf("%s: ESP/AH m_flags:%x\n", __func__,
1399 m->m_flags));
1400 return 1;
1401 }
1402 break;
1403 case IPPROTO_AH:
1404 need_auth = 1;
1405 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1406 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1407 printf("%s: AH m_flags:%x\n", __func__,
1408 m->m_flags));
1409 return 1;
1410 }
1411 break;
1412 case IPPROTO_IPCOMP:
1413 /*
1414 * we don't really care, as IPcomp document
1415 * says that we shouldn't compress small
1416 * packets, IPComp policy should always be
1417 * treated as being in "use" level.
1418 */
1419 break;
1420 }
1421 }
1422 return 0; /* valid */
1423 }
1424
1425 /*
1426 * Check AH/ESP integrity.
1427 * This function is called from tcp_input(), udp_input(),
1428 * and {ah,esp}4_input for tunnel mode
1429 */
1430 int
1431 ipsec4_in_reject(m, inp)
1432 struct mbuf *m;
1433 struct inpcb *inp;
1434 {
1435 struct secpolicy *sp;
1436 int error;
1437 int result;
1438
1439 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1440
1441 /* get SP for this packet.
1442 * When we are called from ip_forward(), we call
1443 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1444 */
1445 if (inp == NULL)
1446 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1447 else
1448 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1449
1450 if (sp != NULL) {
1451 result = ipsec_in_reject(sp, m);
1452 if (result)
1453 ipsec4stat.ips_in_polvio++;
1454 KEY_FREESP(&sp);
1455 } else {
1456 result = 0; /* XXX should be panic ?
1457 * -> No, there may be error. */
1458 }
1459 return result;
1460 }
1461
1462 #ifdef INET6
1463 /*
1464 * Check AH/ESP integrity.
1465 * This function is called from tcp6_input(), udp6_input(),
1466 * and {ah,esp}6_input for tunnel mode
1467 */
1468 int
1469 ipsec6_in_reject(m, inp)
1470 struct mbuf *m;
1471 struct inpcb *inp;
1472 {
1473 struct secpolicy *sp = NULL;
1474 int error;
1475 int result;
1476
1477 /* sanity check */
1478 if (m == NULL)
1479 return 0; /* XXX should be panic ? */
1480
1481 /* get SP for this packet.
1482 * When we are called from ip_forward(), we call
1483 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1484 */
1485 if (inp == NULL)
1486 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1487 else
1488 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1489
1490 if (sp != NULL) {
1491 result = ipsec_in_reject(sp, m);
1492 if (result)
1493 ipsec6stat.ips_in_polvio++;
1494 KEY_FREESP(&sp);
1495 } else {
1496 result = 0;
1497 }
1498 return result;
1499 }
1500 #endif
1501
1502 /*
1503 * compute the byte size to be occupied by IPsec header.
1504 * in case it is tunneled, it includes the size of outer IP header.
1505 * NOTE: SP passed is free in this function.
1506 */
1507 static size_t
1508 ipsec_hdrsiz(struct secpolicy *sp)
1509 {
1510 struct ipsecrequest *isr;
1511 size_t siz;
1512
1513 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1514 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1515
1516 switch (sp->policy) {
1517 case IPSEC_POLICY_DISCARD:
1518 case IPSEC_POLICY_BYPASS:
1519 case IPSEC_POLICY_NONE:
1520 return 0;
1521 }
1522
1523 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1524 ("invalid policy %u", sp->policy));
1525
1526 siz = 0;
1527 for (isr = sp->req; isr != NULL; isr = isr->next) {
1528 size_t clen = 0;
1529
1530 switch (isr->saidx.proto) {
1531 case IPPROTO_ESP:
1532 clen = esp_hdrsiz(isr->sav);
1533 break;
1534 case IPPROTO_AH:
1535 clen = ah_hdrsiz(isr->sav);
1536 break;
1537 case IPPROTO_IPCOMP:
1538 clen = sizeof(struct ipcomp);
1539 break;
1540 }
1541
1542 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1543 switch (isr->saidx.dst.sa.sa_family) {
1544 case AF_INET:
1545 clen += sizeof(struct ip);
1546 break;
1547 #ifdef INET6
1548 case AF_INET6:
1549 clen += sizeof(struct ip6_hdr);
1550 break;
1551 #endif
1552 default:
1553 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1554 "IPsec tunnel SA\n", __func__,
1555 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1556 break;
1557 }
1558 }
1559 siz += clen;
1560 }
1561
1562 return siz;
1563 }
1564
1565 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1566 size_t
1567 ipsec4_hdrsiz(m, dir, inp)
1568 struct mbuf *m;
1569 u_int dir;
1570 struct inpcb *inp;
1571 {
1572 struct secpolicy *sp;
1573 int error;
1574 size_t size;
1575
1576 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1577
1578 /* get SP for this packet.
1579 * When we are called from ip_forward(), we call
1580 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1581 */
1582 if (inp == NULL)
1583 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1584 else
1585 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1586
1587 if (sp != NULL) {
1588 size = ipsec_hdrsiz(sp);
1589 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1590 printf("%s: size:%lu.\n", __func__,
1591 (unsigned long)size));
1592
1593 KEY_FREESP(&sp);
1594 } else {
1595 size = 0; /* XXX should be panic ? */
1596 }
1597 return size;
1598 }
1599
1600 #ifdef INET6
1601 /* This function is called from ipsec6_hdrsize_tcp(),
1602 * and maybe from ip6_forward.()
1603 */
1604 size_t
1605 ipsec6_hdrsiz(m, dir, in6p)
1606 struct mbuf *m;
1607 u_int dir;
1608 struct inpcb *in6p;
1609 {
1610 struct secpolicy *sp;
1611 int error;
1612 size_t size;
1613
1614 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1615 IPSEC_ASSERT(in6p == NULL || in6p->inp_socket != NULL,
1616 ("socket w/o inpcb"));
1617
1618 /* get SP for this packet */
1619 /* XXX Is it right to call with IP_FORWARDING. */
1620 if (in6p == NULL)
1621 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1622 else
1623 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1624
1625 if (sp == NULL)
1626 return 0;
1627 size = ipsec_hdrsiz(sp);
1628 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1629 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1630 KEY_FREESP(&sp);
1631
1632 return size;
1633 }
1634 #endif /*INET6*/
1635
1636 /*
1637 * Check the variable replay window.
1638 * ipsec_chkreplay() performs replay check before ICV verification.
1639 * ipsec_updatereplay() updates replay bitmap. This must be called after
1640 * ICV verification (it also performs replay check, which is usually done
1641 * beforehand).
1642 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1643 *
1644 * based on RFC 2401.
1645 */
1646 int
1647 ipsec_chkreplay(seq, sav)
1648 u_int32_t seq;
1649 struct secasvar *sav;
1650 {
1651 const struct secreplay *replay;
1652 u_int32_t diff;
1653 int fr;
1654 u_int32_t wsizeb; /* constant: bits of window size */
1655 int frlast; /* constant: last frame */
1656
1657 IPSEC_SPLASSERT_SOFTNET(__func__);
1658
1659 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1660 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1661
1662 replay = sav->replay;
1663
1664 if (replay->wsize == 0)
1665 return 1; /* no need to check replay. */
1666
1667 /* constant */
1668 frlast = replay->wsize - 1;
1669 wsizeb = replay->wsize << 3;
1670
1671 /* sequence number of 0 is invalid */
1672 if (seq == 0)
1673 return 0;
1674
1675 /* first time is always okay */
1676 if (replay->count == 0)
1677 return 1;
1678
1679 if (seq > replay->lastseq) {
1680 /* larger sequences are okay */
1681 return 1;
1682 } else {
1683 /* seq is equal or less than lastseq. */
1684 diff = replay->lastseq - seq;
1685
1686 /* over range to check, i.e. too old or wrapped */
1687 if (diff >= wsizeb)
1688 return 0;
1689
1690 fr = frlast - diff / 8;
1691
1692 /* this packet already seen ? */
1693 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1694 return 0;
1695
1696 /* out of order but good */
1697 return 1;
1698 }
1699 }
1700
1701 /*
1702 * check replay counter whether to update or not.
1703 * OUT: 0: OK
1704 * 1: NG
1705 */
1706 int
1707 ipsec_updatereplay(seq, sav)
1708 u_int32_t seq;
1709 struct secasvar *sav;
1710 {
1711 struct secreplay *replay;
1712 u_int32_t diff;
1713 int fr;
1714 u_int32_t wsizeb; /* constant: bits of window size */
1715 int frlast; /* constant: last frame */
1716
1717 IPSEC_SPLASSERT_SOFTNET(__func__);
1718
1719 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1720 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1721
1722 replay = sav->replay;
1723
1724 if (replay->wsize == 0)
1725 goto ok; /* no need to check replay. */
1726
1727 /* constant */
1728 frlast = replay->wsize - 1;
1729 wsizeb = replay->wsize << 3;
1730
1731 /* sequence number of 0 is invalid */
1732 if (seq == 0)
1733 return 1;
1734
1735 /* first time */
1736 if (replay->count == 0) {
1737 replay->lastseq = seq;
1738 bzero(replay->bitmap, replay->wsize);
1739 (replay->bitmap)[frlast] = 1;
1740 goto ok;
1741 }
1742
1743 if (seq > replay->lastseq) {
1744 /* seq is larger than lastseq. */
1745 diff = seq - replay->lastseq;
1746
1747 /* new larger sequence number */
1748 if (diff < wsizeb) {
1749 /* In window */
1750 /* set bit for this packet */
1751 vshiftl(replay->bitmap, diff, replay->wsize);
1752 (replay->bitmap)[frlast] |= 1;
1753 } else {
1754 /* this packet has a "way larger" */
1755 bzero(replay->bitmap, replay->wsize);
1756 (replay->bitmap)[frlast] = 1;
1757 }
1758 replay->lastseq = seq;
1759
1760 /* larger is good */
1761 } else {
1762 /* seq is equal or less than lastseq. */
1763 diff = replay->lastseq - seq;
1764
1765 /* over range to check, i.e. too old or wrapped */
1766 if (diff >= wsizeb)
1767 return 1;
1768
1769 fr = frlast - diff / 8;
1770
1771 /* this packet already seen ? */
1772 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1773 return 1;
1774
1775 /* mark as seen */
1776 (replay->bitmap)[fr] |= (1 << (diff % 8));
1777
1778 /* out of order but good */
1779 }
1780
1781 ok:
1782 if (replay->count == ~0) {
1783
1784 /* set overflow flag */
1785 replay->overflow++;
1786
1787 /* don't increment, no more packets accepted */
1788 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1789 return 1;
1790
1791 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1792 __func__, replay->overflow, ipsec_logsastr(sav)));
1793 }
1794
1795 replay->count++;
1796
1797 return 0;
1798 }
1799
1800 /*
1801 * shift variable length buffer to left.
1802 * IN: bitmap: pointer to the buffer
1803 * nbit: the number of to shift.
1804 * wsize: buffer size (bytes).
1805 */
1806 static void
1807 vshiftl(bitmap, nbit, wsize)
1808 unsigned char *bitmap;
1809 int nbit, wsize;
1810 {
1811 int s, j, i;
1812 unsigned char over;
1813
1814 for (j = 0; j < nbit; j += 8) {
1815 s = (nbit - j < 8) ? (nbit - j): 8;
1816 bitmap[0] <<= s;
1817 for (i = 1; i < wsize; i++) {
1818 over = (bitmap[i] >> (8 - s));
1819 bitmap[i] <<= s;
1820 bitmap[i-1] |= over;
1821 }
1822 }
1823
1824 return;
1825 }
1826
1827 /* Return a printable string for the IPv4 address. */
1828 static char *
1829 inet_ntoa4(struct in_addr ina)
1830 {
1831 static char buf[4][4 * sizeof "123" + 4];
1832 unsigned char *ucp = (unsigned char *) &ina;
1833 static int i = 3;
1834
1835 /* XXX-BZ returns static buffer. */
1836 i = (i + 1) % 4;
1837 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1838 ucp[2] & 0xff, ucp[3] & 0xff);
1839 return (buf[i]);
1840 }
1841
1842 /* Return a printable string for the address. */
1843 char *
1844 ipsec_address(union sockaddr_union* sa)
1845 {
1846 #ifdef INET6
1847 char ip6buf[INET6_ADDRSTRLEN];
1848 #endif
1849 switch (sa->sa.sa_family) {
1850 #ifdef INET
1851 case AF_INET:
1852 return inet_ntoa4(sa->sin.sin_addr);
1853 #endif /* INET */
1854
1855 #ifdef INET6
1856 case AF_INET6:
1857 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr);
1858 #endif /* INET6 */
1859
1860 default:
1861 return "(unknown address family)";
1862 }
1863 }
1864
1865 const char *
1866 ipsec_logsastr(sav)
1867 struct secasvar *sav;
1868 {
1869 static char buf[256];
1870 char *p;
1871 struct secasindex *saidx = &sav->sah->saidx;
1872
1873 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1874 ("address family mismatch"));
1875
1876 p = buf;
1877 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1878 while (p && *p)
1879 p++;
1880 /* NB: only use ipsec_address on one address at a time */
1881 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1882 ipsec_address(&saidx->src));
1883 while (p && *p)
1884 p++;
1885 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1886 ipsec_address(&saidx->dst));
1887
1888 return buf;
1889 }
1890
1891 void
1892 ipsec_dumpmbuf(m)
1893 struct mbuf *m;
1894 {
1895 int totlen;
1896 int i;
1897 u_char *p;
1898
1899 totlen = 0;
1900 printf("---\n");
1901 while (m) {
1902 p = mtod(m, u_char *);
1903 for (i = 0; i < m->m_len; i++) {
1904 printf("%02x ", p[i]);
1905 totlen++;
1906 if (totlen % 16 == 0)
1907 printf("\n");
1908 }
1909 m = m->m_next;
1910 }
1911 if (totlen % 16 != 0)
1912 printf("\n");
1913 printf("---\n");
1914 }
1915
1916 static void
1917 ipsec_attach(void)
1918 {
1919 SECPOLICY_LOCK_INIT(&ip4_def_policy);
1920 ip4_def_policy.refcnt = 1; /* NB: disallow free */
1921 }
1922 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL);
1923
1924
1925 /* XXX this stuff doesn't belong here... */
1926
1927 static struct xformsw* xforms = NULL;
1928
1929 /*
1930 * Register a transform; typically at system startup.
1931 */
1932 void
1933 xform_register(struct xformsw* xsp)
1934 {
1935 xsp->xf_next = xforms;
1936 xforms = xsp;
1937 }
1938
1939 /*
1940 * Initialize transform support in an sav.
1941 */
1942 int
1943 xform_init(struct secasvar *sav, int xftype)
1944 {
1945 struct xformsw *xsp;
1946
1947 if (sav->tdb_xform != NULL) /* previously initialized */
1948 return 0;
1949 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1950 if (xsp->xf_type == xftype)
1951 return (*xsp->xf_init)(sav, xsp);
1952 return EINVAL;
1953 }
Cache object: 1aa433199807e720fccf9201b2a3d449
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