FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $FreeBSD$ */
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 SYSCTL_DECL(_net_inet_ipsec);
126
127 /* net.inet.ipsec */
128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
129 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
131 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
133 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
135 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
137 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
139 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
141 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
143 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
145 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
147 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
149 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
150 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
151 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
152 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
153 ipsecstats, CTLFLAG_RD, &ipsec4stat, ipsecstat, "");
154
155 #ifdef REGRESSION
156 /*
157 * When set to 1, IPsec will send packets with the same sequence number.
158 * This allows to verify if the other side has proper replay attacks detection.
159 */
160 int ipsec_replay = 0;
161 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
162 "Emulate replay attack");
163 /*
164 * When set 1, IPsec will send packets with corrupted HMAC.
165 * This allows to verify if the other side properly detects modified packets.
166 */
167 int ipsec_integrity = 0;
168 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
169 &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
170 #endif
171
172 #ifdef INET6
173 struct ipsecstat ipsec6stat;
174 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
175 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
176 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
177 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
178 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
179 int ip6_esp_randpad = -1;
180
181 SYSCTL_DECL(_net_inet6_ipsec6);
182
183 /* net.inet6.ipsec6 */
184 #ifdef COMPAT_KAME
185 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
186 0,0, compat_ipsecstats_sysctl, "S", "");
187 #endif /* COMPAT_KAME */
188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
189 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
191 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
193 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
195 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
197 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
199 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
201 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
202 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
203 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
204 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS,
205 ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "");
206 #endif /* INET6 */
207
208 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
209 #ifdef INET6
210 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct inpcb *pcb));
211 #endif
212 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
213 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
214 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
215 #ifdef INET6
216 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
217 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
218 #endif
219 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
220 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
221 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
222 int optname, caddr_t request, size_t len, struct ucred *cred));
223 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
224 static void vshiftl __P((unsigned char *, int, int));
225 static size_t ipsec_hdrsiz __P((struct secpolicy *));
226
227 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
228
229 /*
230 * Return a held reference to the default SP.
231 */
232 static struct secpolicy *
233 key_allocsp_default(const char* where, int tag)
234 {
235 struct secpolicy *sp;
236
237 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
238 printf("DP key_allocsp_default from %s:%u\n", where, tag));
239
240 sp = &ip4_def_policy;
241 if (sp->policy != IPSEC_POLICY_DISCARD &&
242 sp->policy != IPSEC_POLICY_NONE) {
243 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
244 sp->policy, IPSEC_POLICY_NONE));
245 sp->policy = IPSEC_POLICY_NONE;
246 }
247 key_addref(sp);
248
249 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
250 printf("DP key_allocsp_default returns SP:%p (%u)\n",
251 sp, sp->refcnt));
252 return sp;
253 }
254 #define KEY_ALLOCSP_DEFAULT() \
255 key_allocsp_default(__FILE__, __LINE__)
256
257 /*
258 * For OUTBOUND packet having a socket. Searching SPD for packet,
259 * and return a pointer to SP.
260 * OUT: NULL: no apropreate SP found, the following value is set to error.
261 * 0 : bypass
262 * EACCES : discard packet.
263 * ENOENT : ipsec_acquire() in progress, maybe.
264 * others : error occured.
265 * others: a pointer to SP
266 *
267 * NOTE: IPv6 mapped adddress concern is implemented here.
268 */
269 struct secpolicy *
270 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
271 {
272 struct secpolicy *sp;
273
274 IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
275 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
276 ("invalid direction %u", dir));
277
278 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
279 if (sp == NULL) /*XXX????*/
280 sp = KEY_ALLOCSP_DEFAULT();
281 IPSEC_ASSERT(sp != NULL, ("null SP"));
282 return sp;
283 }
284
285 /*
286 * For OUTBOUND packet having a socket. Searching SPD for packet,
287 * and return a pointer to SP.
288 * OUT: NULL: no apropreate SP found, the following value is set to error.
289 * 0 : bypass
290 * EACCES : discard packet.
291 * ENOENT : ipsec_acquire() in progress, maybe.
292 * others : error occured.
293 * others: a pointer to SP
294 *
295 * NOTE: IPv6 mapped adddress concern is implemented here.
296 */
297 struct secpolicy *
298 ipsec_getpolicybysock(m, dir, inp, error)
299 struct mbuf *m;
300 u_int dir;
301 struct inpcb *inp;
302 int *error;
303 {
304 struct inpcbpolicy *pcbsp = NULL;
305 struct secpolicy *currsp = NULL; /* policy on socket */
306 struct secpolicy *sp;
307
308 IPSEC_ASSERT(m != NULL, ("null mbuf"));
309 IPSEC_ASSERT(inp != NULL, ("null inpcb"));
310 IPSEC_ASSERT(error != NULL, ("null error"));
311 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
312 ("invalid direction %u", dir));
313
314 /* set spidx in pcb */
315 if (inp->inp_vflag & INP_IPV6PROTO) {
316 #ifdef INET6
317 *error = ipsec6_setspidx_in6pcb(m, inp);
318 pcbsp = inp->inp_sp;
319 #else
320 *error = EINVAL; /* should not happen */
321 #endif
322 } else {
323 *error = ipsec4_setspidx_inpcb(m, inp);
324 pcbsp = inp->inp_sp;
325 }
326 if (*error)
327 return NULL;
328
329 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
330 switch (dir) {
331 case IPSEC_DIR_INBOUND:
332 currsp = pcbsp->sp_in;
333 break;
334 case IPSEC_DIR_OUTBOUND:
335 currsp = pcbsp->sp_out;
336 break;
337 }
338 IPSEC_ASSERT(currsp != NULL, ("null currsp"));
339
340 if (pcbsp->priv) { /* when privilieged socket */
341 switch (currsp->policy) {
342 case IPSEC_POLICY_BYPASS:
343 case IPSEC_POLICY_IPSEC:
344 key_addref(currsp);
345 sp = currsp;
346 break;
347
348 case IPSEC_POLICY_ENTRUST:
349 /* look for a policy in SPD */
350 sp = KEY_ALLOCSP(&currsp->spidx, dir);
351 if (sp == NULL) /* no SP found */
352 sp = KEY_ALLOCSP_DEFAULT();
353 break;
354
355 default:
356 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
357 __func__, currsp->policy));
358 *error = EINVAL;
359 return NULL;
360 }
361 } else { /* unpriv, SPD has policy */
362 sp = KEY_ALLOCSP(&currsp->spidx, dir);
363 if (sp == NULL) { /* no SP found */
364 switch (currsp->policy) {
365 case IPSEC_POLICY_BYPASS:
366 ipseclog((LOG_ERR, "%s: Illegal policy for "
367 "non-priviliged defined %d\n",
368 __func__, currsp->policy));
369 *error = EINVAL;
370 return NULL;
371
372 case IPSEC_POLICY_ENTRUST:
373 sp = KEY_ALLOCSP_DEFAULT();
374 break;
375
376 case IPSEC_POLICY_IPSEC:
377 key_addref(currsp);
378 sp = currsp;
379 break;
380
381 default:
382 ipseclog((LOG_ERR, "%s: Invalid policy for "
383 "PCB %d\n", __func__, currsp->policy));
384 *error = EINVAL;
385 return NULL;
386 }
387 }
388 }
389 IPSEC_ASSERT(sp != NULL,
390 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
391 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
392 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
393 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
394 return sp;
395 }
396
397 /*
398 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
399 * and return a pointer to SP.
400 * OUT: positive: a pointer to the entry for security policy leaf matched.
401 * NULL: no apropreate SP found, the following value is set to error.
402 * 0 : bypass
403 * EACCES : discard packet.
404 * ENOENT : ipsec_acquire() in progress, maybe.
405 * others : error occured.
406 */
407 struct secpolicy *
408 ipsec_getpolicybyaddr(m, dir, flag, error)
409 struct mbuf *m;
410 u_int dir;
411 int flag;
412 int *error;
413 {
414 struct secpolicyindex spidx;
415 struct secpolicy *sp;
416
417 IPSEC_ASSERT(m != NULL, ("null mbuf"));
418 IPSEC_ASSERT(error != NULL, ("null error"));
419 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
420 ("invalid direction %u", dir));
421
422 sp = NULL;
423 if (key_havesp(dir)) {
424 /* Make an index to look for a policy. */
425 *error = ipsec_setspidx(m, &spidx,
426 (flag & IP_FORWARDING) ? 0 : 1);
427 if (*error != 0) {
428 DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
429 __func__, dir, flag));
430 return NULL;
431 }
432 spidx.dir = dir;
433
434 sp = KEY_ALLOCSP(&spidx, dir);
435 }
436 if (sp == NULL) /* no SP found, use system default */
437 sp = KEY_ALLOCSP_DEFAULT();
438 IPSEC_ASSERT(sp != NULL, ("null SP"));
439 return sp;
440 }
441
442 struct secpolicy *
443 ipsec4_checkpolicy(m, dir, flag, error, inp)
444 struct mbuf *m;
445 u_int dir, flag;
446 int *error;
447 struct inpcb *inp;
448 {
449 struct secpolicy *sp;
450
451 *error = 0;
452 if (inp == NULL)
453 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
454 else
455 sp = ipsec_getpolicybysock(m, dir, inp, error);
456 if (sp == NULL) {
457 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
458 ipsec4stat.ips_out_inval++;
459 return NULL;
460 }
461 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
462 switch (sp->policy) {
463 case IPSEC_POLICY_ENTRUST:
464 default:
465 printf("%s: invalid policy %u\n", __func__, sp->policy);
466 /* fall thru... */
467 case IPSEC_POLICY_DISCARD:
468 ipsec4stat.ips_out_polvio++;
469 *error = -EINVAL; /* packet is discarded by caller */
470 break;
471 case IPSEC_POLICY_BYPASS:
472 case IPSEC_POLICY_NONE:
473 KEY_FREESP(&sp);
474 sp = NULL; /* NB: force NULL result */
475 break;
476 case IPSEC_POLICY_IPSEC:
477 if (sp->req == NULL) /* acquire an SA */
478 *error = key_spdacquire(sp);
479 break;
480 }
481 if (*error != 0) {
482 KEY_FREESP(&sp);
483 sp = NULL;
484 }
485 return sp;
486 }
487
488 static int
489 ipsec4_setspidx_inpcb(m, pcb)
490 struct mbuf *m;
491 struct inpcb *pcb;
492 {
493 int error;
494
495 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
496 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
497 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
498 ("null sp_in || sp_out"));
499
500 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
501 if (error == 0) {
502 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
503 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
504 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
505 } else {
506 bzero(&pcb->inp_sp->sp_in->spidx,
507 sizeof (pcb->inp_sp->sp_in->spidx));
508 bzero(&pcb->inp_sp->sp_out->spidx,
509 sizeof (pcb->inp_sp->sp_in->spidx));
510 }
511 return error;
512 }
513
514 #ifdef INET6
515 static int
516 ipsec6_setspidx_in6pcb(m, pcb)
517 struct mbuf *m;
518 struct inpcb *pcb;
519 {
520 struct secpolicyindex *spidx;
521 int error;
522
523 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
524 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
525 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
526 ("null sp_in || sp_out"));
527
528 bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
529 bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
530
531 spidx = &pcb->inp_sp->sp_in->spidx;
532 error = ipsec_setspidx(m, spidx, 1);
533 if (error)
534 goto bad;
535 spidx->dir = IPSEC_DIR_INBOUND;
536
537 spidx = &pcb->inp_sp->sp_out->spidx;
538 error = ipsec_setspidx(m, spidx, 1);
539 if (error)
540 goto bad;
541 spidx->dir = IPSEC_DIR_OUTBOUND;
542
543 return 0;
544
545 bad:
546 bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx));
547 bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx));
548 return error;
549 }
550 #endif
551
552 /*
553 * configure security policy index (src/dst/proto/sport/dport)
554 * by looking at the content of mbuf.
555 * the caller is responsible for error recovery (like clearing up spidx).
556 */
557 static int
558 ipsec_setspidx(m, spidx, needport)
559 struct mbuf *m;
560 struct secpolicyindex *spidx;
561 int needport;
562 {
563 struct ip *ip = NULL;
564 struct ip ipbuf;
565 u_int v;
566 struct mbuf *n;
567 int len;
568 int error;
569
570 IPSEC_ASSERT(m != NULL, ("null mbuf"));
571
572 /*
573 * validate m->m_pkthdr.len. we see incorrect length if we
574 * mistakenly call this function with inconsistent mbuf chain
575 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
576 */
577 len = 0;
578 for (n = m; n; n = n->m_next)
579 len += n->m_len;
580 if (m->m_pkthdr.len != len) {
581 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
582 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
583 __func__, len, m->m_pkthdr.len));
584 return EINVAL;
585 }
586
587 if (m->m_pkthdr.len < sizeof(struct ip)) {
588 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
589 printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
590 __func__, m->m_pkthdr.len));
591 return EINVAL;
592 }
593
594 if (m->m_len >= sizeof(*ip))
595 ip = mtod(m, struct ip *);
596 else {
597 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
598 ip = &ipbuf;
599 }
600 #ifdef _IP_VHL
601 v = _IP_VHL_V(ip->ip_vhl);
602 #else
603 v = ip->ip_v;
604 #endif
605 switch (v) {
606 case 4:
607 error = ipsec4_setspidx_ipaddr(m, spidx);
608 if (error)
609 return error;
610 ipsec4_get_ulp(m, spidx, needport);
611 return 0;
612 #ifdef INET6
613 case 6:
614 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
615 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
616 printf("%s: pkthdr len(%d) too small (v6), "
617 "ignored\n", __func__, m->m_pkthdr.len));
618 return EINVAL;
619 }
620 error = ipsec6_setspidx_ipaddr(m, spidx);
621 if (error)
622 return error;
623 ipsec6_get_ulp(m, spidx, needport);
624 return 0;
625 #endif
626 default:
627 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
628 printf("%s: " "unknown IP version %u, ignored.\n",
629 __func__, v));
630 return EINVAL;
631 }
632 }
633
634 static void
635 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
636 {
637 u_int8_t nxt;
638 int off;
639
640 /* sanity check */
641 IPSEC_ASSERT(m != NULL, ("null mbuf"));
642 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
643
644 /* NB: ip_input() flips it into host endian XXX need more checking */
645 if (m->m_len < sizeof (struct ip)) {
646 struct ip *ip = mtod(m, struct ip *);
647 if (ip->ip_off & (IP_MF | IP_OFFMASK))
648 goto done;
649 #ifdef _IP_VHL
650 off = _IP_VHL_HL(ip->ip_vhl) << 2;
651 #else
652 off = ip->ip_hl << 2;
653 #endif
654 nxt = ip->ip_p;
655 } else {
656 struct ip ih;
657
658 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
659 if (ih.ip_off & (IP_MF | IP_OFFMASK))
660 goto done;
661 #ifdef _IP_VHL
662 off = _IP_VHL_HL(ih.ip_vhl) << 2;
663 #else
664 off = ih.ip_hl << 2;
665 #endif
666 nxt = ih.ip_p;
667 }
668
669 while (off < m->m_pkthdr.len) {
670 struct ip6_ext ip6e;
671 struct tcphdr th;
672 struct udphdr uh;
673
674 switch (nxt) {
675 case IPPROTO_TCP:
676 spidx->ul_proto = nxt;
677 if (!needport)
678 goto done_proto;
679 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
680 goto done;
681 m_copydata(m, off, sizeof (th), (caddr_t) &th);
682 spidx->src.sin.sin_port = th.th_sport;
683 spidx->dst.sin.sin_port = th.th_dport;
684 return;
685 case IPPROTO_UDP:
686 spidx->ul_proto = nxt;
687 if (!needport)
688 goto done_proto;
689 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
690 goto done;
691 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
692 spidx->src.sin.sin_port = uh.uh_sport;
693 spidx->dst.sin.sin_port = uh.uh_dport;
694 return;
695 case IPPROTO_AH:
696 if (off + sizeof(ip6e) > m->m_pkthdr.len)
697 goto done;
698 /* XXX sigh, this works but is totally bogus */
699 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
700 off += (ip6e.ip6e_len + 2) << 2;
701 nxt = ip6e.ip6e_nxt;
702 break;
703 case IPPROTO_ICMP:
704 default:
705 /* XXX intermediate headers??? */
706 spidx->ul_proto = nxt;
707 goto done_proto;
708 }
709 }
710 done:
711 spidx->ul_proto = IPSEC_ULPROTO_ANY;
712 done_proto:
713 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
714 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
715 }
716
717 /* assumes that m is sane */
718 static int
719 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
720 {
721 static const struct sockaddr_in template = {
722 sizeof (struct sockaddr_in),
723 AF_INET,
724 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
725 };
726
727 spidx->src.sin = template;
728 spidx->dst.sin = template;
729
730 if (m->m_len < sizeof (struct ip)) {
731 m_copydata(m, offsetof(struct ip, ip_src),
732 sizeof (struct in_addr),
733 (caddr_t) &spidx->src.sin.sin_addr);
734 m_copydata(m, offsetof(struct ip, ip_dst),
735 sizeof (struct in_addr),
736 (caddr_t) &spidx->dst.sin.sin_addr);
737 } else {
738 struct ip *ip = mtod(m, struct ip *);
739 spidx->src.sin.sin_addr = ip->ip_src;
740 spidx->dst.sin.sin_addr = ip->ip_dst;
741 }
742
743 spidx->prefs = sizeof(struct in_addr) << 3;
744 spidx->prefd = sizeof(struct in_addr) << 3;
745
746 return 0;
747 }
748
749 #ifdef INET6
750 static void
751 ipsec6_get_ulp(m, spidx, needport)
752 struct mbuf *m;
753 struct secpolicyindex *spidx;
754 int needport;
755 {
756 int off, nxt;
757 struct tcphdr th;
758 struct udphdr uh;
759 struct icmp6_hdr ih;
760
761 /* sanity check */
762 if (m == NULL)
763 panic("%s: NULL pointer was passed.\n", __func__);
764
765 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
766 printf("%s:\n", __func__); kdebug_mbuf(m));
767
768 /* set default */
769 spidx->ul_proto = IPSEC_ULPROTO_ANY;
770 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
771 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
772
773 nxt = -1;
774 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
775 if (off < 0 || m->m_pkthdr.len < off)
776 return;
777
778 switch (nxt) {
779 case IPPROTO_TCP:
780 spidx->ul_proto = nxt;
781 if (!needport)
782 break;
783 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
784 break;
785 m_copydata(m, off, sizeof(th), (caddr_t)&th);
786 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
787 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
788 break;
789 case IPPROTO_UDP:
790 spidx->ul_proto = nxt;
791 if (!needport)
792 break;
793 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
794 break;
795 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
796 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
797 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
798 break;
799 case IPPROTO_ICMPV6:
800 spidx->ul_proto = nxt;
801 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
802 break;
803 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
804 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
805 htons((uint16_t)ih.icmp6_type);
806 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
807 htons((uint16_t)ih.icmp6_code);
808 break;
809 default:
810 /* XXX intermediate headers??? */
811 spidx->ul_proto = nxt;
812 break;
813 }
814 }
815
816 /* assumes that m is sane */
817 static int
818 ipsec6_setspidx_ipaddr(m, spidx)
819 struct mbuf *m;
820 struct secpolicyindex *spidx;
821 {
822 struct ip6_hdr *ip6 = NULL;
823 struct ip6_hdr ip6buf;
824 struct sockaddr_in6 *sin6;
825
826 if (m->m_len >= sizeof(*ip6))
827 ip6 = mtod(m, struct ip6_hdr *);
828 else {
829 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
830 ip6 = &ip6buf;
831 }
832
833 sin6 = (struct sockaddr_in6 *)&spidx->src;
834 bzero(sin6, sizeof(*sin6));
835 sin6->sin6_family = AF_INET6;
836 sin6->sin6_len = sizeof(struct sockaddr_in6);
837 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
838 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
839 sin6->sin6_addr.s6_addr16[1] = 0;
840 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
841 }
842 spidx->prefs = sizeof(struct in6_addr) << 3;
843
844 sin6 = (struct sockaddr_in6 *)&spidx->dst;
845 bzero(sin6, sizeof(*sin6));
846 sin6->sin6_family = AF_INET6;
847 sin6->sin6_len = sizeof(struct sockaddr_in6);
848 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
849 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
850 sin6->sin6_addr.s6_addr16[1] = 0;
851 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
852 }
853 spidx->prefd = sizeof(struct in6_addr) << 3;
854
855 return 0;
856 }
857 #endif
858
859 static void
860 ipsec_delpcbpolicy(p)
861 struct inpcbpolicy *p;
862 {
863 free(p, M_IPSEC_INPCB);
864 }
865
866 /* initialize policy in PCB */
867 int
868 ipsec_init_policy(so, pcb_sp)
869 struct socket *so;
870 struct inpcbpolicy **pcb_sp;
871 {
872 struct inpcbpolicy *new;
873
874 /* sanity check. */
875 if (so == NULL || pcb_sp == NULL)
876 panic("%s: NULL pointer was passed.\n", __func__);
877
878 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
879 M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
880 if (new == NULL) {
881 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
882 return ENOBUFS;
883 }
884
885 new->priv = IPSEC_IS_PRIVILEGED_SO(so);
886
887 if ((new->sp_in = KEY_NEWSP()) == NULL) {
888 ipsec_delpcbpolicy(new);
889 return ENOBUFS;
890 }
891 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
892 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
893
894 if ((new->sp_out = KEY_NEWSP()) == NULL) {
895 KEY_FREESP(&new->sp_in);
896 ipsec_delpcbpolicy(new);
897 return ENOBUFS;
898 }
899 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
900 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
901
902 *pcb_sp = new;
903
904 return 0;
905 }
906
907 /* copy old ipsec policy into new */
908 int
909 ipsec_copy_policy(old, new)
910 struct inpcbpolicy *old, *new;
911 {
912 struct secpolicy *sp;
913
914 sp = ipsec_deepcopy_policy(old->sp_in);
915 if (sp) {
916 KEY_FREESP(&new->sp_in);
917 new->sp_in = sp;
918 } else
919 return ENOBUFS;
920
921 sp = ipsec_deepcopy_policy(old->sp_out);
922 if (sp) {
923 KEY_FREESP(&new->sp_out);
924 new->sp_out = sp;
925 } else
926 return ENOBUFS;
927
928 new->priv = old->priv;
929
930 return 0;
931 }
932
933 struct ipsecrequest *
934 ipsec_newisr(void)
935 {
936 struct ipsecrequest *p;
937
938 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
939 if (p != NULL)
940 IPSECREQUEST_LOCK_INIT(p);
941 return p;
942 }
943
944 void
945 ipsec_delisr(struct ipsecrequest *p)
946 {
947 IPSECREQUEST_LOCK_DESTROY(p);
948 free(p, M_IPSEC_SR);
949 }
950
951 /* deep-copy a policy in PCB */
952 static struct secpolicy *
953 ipsec_deepcopy_policy(src)
954 struct secpolicy *src;
955 {
956 struct ipsecrequest *newchain = NULL;
957 struct ipsecrequest *p;
958 struct ipsecrequest **q;
959 struct ipsecrequest *r;
960 struct secpolicy *dst;
961
962 if (src == NULL)
963 return NULL;
964 dst = KEY_NEWSP();
965 if (dst == NULL)
966 return NULL;
967
968 /*
969 * deep-copy IPsec request chain. This is required since struct
970 * ipsecrequest is not reference counted.
971 */
972 q = &newchain;
973 for (p = src->req; p; p = p->next) {
974 *q = ipsec_newisr();
975 if (*q == NULL)
976 goto fail;
977 (*q)->saidx.proto = p->saidx.proto;
978 (*q)->saidx.mode = p->saidx.mode;
979 (*q)->level = p->level;
980 (*q)->saidx.reqid = p->saidx.reqid;
981
982 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
983 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
984
985 (*q)->sp = dst;
986
987 q = &((*q)->next);
988 }
989
990 dst->req = newchain;
991 dst->state = src->state;
992 dst->policy = src->policy;
993 /* do not touch the refcnt fields */
994
995 return dst;
996
997 fail:
998 for (p = newchain; p; p = r) {
999 r = p->next;
1000 ipsec_delisr(p);
1001 p = NULL;
1002 }
1003 return NULL;
1004 }
1005
1006 /* set policy and ipsec request if present. */
1007 static int
1008 ipsec_set_policy(pcb_sp, optname, request, len, cred)
1009 struct secpolicy **pcb_sp;
1010 int optname;
1011 caddr_t request;
1012 size_t len;
1013 struct ucred *cred;
1014 {
1015 struct sadb_x_policy *xpl;
1016 struct secpolicy *newsp = NULL;
1017 int error;
1018
1019 /* sanity check. */
1020 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1021 return EINVAL;
1022 if (len < sizeof(*xpl))
1023 return EINVAL;
1024 xpl = (struct sadb_x_policy *)request;
1025
1026 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1027 printf("%s: passed policy\n", __func__);
1028 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1029
1030 /* check policy type */
1031 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1032 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1033 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1034 return EINVAL;
1035
1036 /* check privileged socket */
1037 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) {
1038 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0);
1039 if (error)
1040 return EACCES;
1041 }
1042
1043 /* allocation new SP entry */
1044 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1045 return error;
1046
1047 newsp->state = IPSEC_SPSTATE_ALIVE;
1048
1049 /* clear old SP and set new SP */
1050 KEY_FREESP(pcb_sp);
1051 *pcb_sp = newsp;
1052 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1053 printf("%s: new policy\n", __func__);
1054 kdebug_secpolicy(newsp));
1055
1056 return 0;
1057 }
1058
1059 static int
1060 ipsec_get_policy(pcb_sp, mp)
1061 struct secpolicy *pcb_sp;
1062 struct mbuf **mp;
1063 {
1064
1065 /* sanity check. */
1066 if (pcb_sp == NULL || mp == NULL)
1067 return EINVAL;
1068
1069 *mp = key_sp2msg(pcb_sp);
1070 if (!*mp) {
1071 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
1072 return ENOBUFS;
1073 }
1074
1075 (*mp)->m_type = MT_DATA;
1076 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1077 printf("%s:\n", __func__); kdebug_mbuf(*mp));
1078
1079 return 0;
1080 }
1081
1082 int
1083 ipsec4_set_policy(inp, optname, request, len, cred)
1084 struct inpcb *inp;
1085 int optname;
1086 caddr_t request;
1087 size_t len;
1088 struct ucred *cred;
1089 {
1090 struct sadb_x_policy *xpl;
1091 struct secpolicy **pcb_sp;
1092
1093 /* sanity check. */
1094 if (inp == NULL || request == NULL)
1095 return EINVAL;
1096 if (len < sizeof(*xpl))
1097 return EINVAL;
1098 xpl = (struct sadb_x_policy *)request;
1099
1100 /* select direction */
1101 switch (xpl->sadb_x_policy_dir) {
1102 case IPSEC_DIR_INBOUND:
1103 pcb_sp = &inp->inp_sp->sp_in;
1104 break;
1105 case IPSEC_DIR_OUTBOUND:
1106 pcb_sp = &inp->inp_sp->sp_out;
1107 break;
1108 default:
1109 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1110 xpl->sadb_x_policy_dir));
1111 return EINVAL;
1112 }
1113
1114 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1115 }
1116
1117 int
1118 ipsec4_get_policy(inp, request, len, mp)
1119 struct inpcb *inp;
1120 caddr_t request;
1121 size_t len;
1122 struct mbuf **mp;
1123 {
1124 struct sadb_x_policy *xpl;
1125 struct secpolicy *pcb_sp;
1126
1127 /* sanity check. */
1128 if (inp == NULL || request == NULL || mp == NULL)
1129 return EINVAL;
1130 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
1131 if (len < sizeof(*xpl))
1132 return EINVAL;
1133 xpl = (struct sadb_x_policy *)request;
1134
1135 /* select direction */
1136 switch (xpl->sadb_x_policy_dir) {
1137 case IPSEC_DIR_INBOUND:
1138 pcb_sp = inp->inp_sp->sp_in;
1139 break;
1140 case IPSEC_DIR_OUTBOUND:
1141 pcb_sp = inp->inp_sp->sp_out;
1142 break;
1143 default:
1144 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1145 xpl->sadb_x_policy_dir));
1146 return EINVAL;
1147 }
1148
1149 return ipsec_get_policy(pcb_sp, mp);
1150 }
1151
1152 /* delete policy in PCB */
1153 int
1154 ipsec_delete_pcbpolicy(inp)
1155 struct inpcb *inp;
1156 {
1157 IPSEC_ASSERT(inp != NULL, ("null inp"));
1158
1159 if (inp->inp_sp == NULL)
1160 return 0;
1161
1162 if (inp->inp_sp->sp_in != NULL)
1163 KEY_FREESP(&inp->inp_sp->sp_in);
1164
1165 if (inp->inp_sp->sp_out != NULL)
1166 KEY_FREESP(&inp->inp_sp->sp_out);
1167
1168 ipsec_delpcbpolicy(inp->inp_sp);
1169 inp->inp_sp = NULL;
1170
1171 return 0;
1172 }
1173
1174 #ifdef INET6
1175 int
1176 ipsec6_set_policy(in6p, optname, request, len, cred)
1177 struct inpcb *in6p;
1178 int optname;
1179 caddr_t request;
1180 size_t len;
1181 struct ucred *cred;
1182 {
1183 struct sadb_x_policy *xpl;
1184 struct secpolicy **pcb_sp;
1185
1186 /* sanity check. */
1187 if (in6p == NULL || request == NULL)
1188 return EINVAL;
1189 if (len < sizeof(*xpl))
1190 return EINVAL;
1191 xpl = (struct sadb_x_policy *)request;
1192
1193 /* select direction */
1194 switch (xpl->sadb_x_policy_dir) {
1195 case IPSEC_DIR_INBOUND:
1196 pcb_sp = &in6p->inp_sp->sp_in;
1197 break;
1198 case IPSEC_DIR_OUTBOUND:
1199 pcb_sp = &in6p->inp_sp->sp_out;
1200 break;
1201 default:
1202 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1203 xpl->sadb_x_policy_dir));
1204 return EINVAL;
1205 }
1206
1207 return ipsec_set_policy(pcb_sp, optname, request, len, cred);
1208 }
1209
1210 int
1211 ipsec6_get_policy(in6p, request, len, mp)
1212 struct inpcb *in6p;
1213 caddr_t request;
1214 size_t len;
1215 struct mbuf **mp;
1216 {
1217 struct sadb_x_policy *xpl;
1218 struct secpolicy *pcb_sp;
1219
1220 /* sanity check. */
1221 if (in6p == NULL || request == NULL || mp == NULL)
1222 return EINVAL;
1223 IPSEC_ASSERT(in6p->inp_sp != NULL, ("null inp_sp"));
1224 if (len < sizeof(*xpl))
1225 return EINVAL;
1226 xpl = (struct sadb_x_policy *)request;
1227
1228 /* select direction */
1229 switch (xpl->sadb_x_policy_dir) {
1230 case IPSEC_DIR_INBOUND:
1231 pcb_sp = in6p->inp_sp->sp_in;
1232 break;
1233 case IPSEC_DIR_OUTBOUND:
1234 pcb_sp = in6p->inp_sp->sp_out;
1235 break;
1236 default:
1237 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1238 xpl->sadb_x_policy_dir));
1239 return EINVAL;
1240 }
1241
1242 return ipsec_get_policy(pcb_sp, mp);
1243 }
1244 #endif
1245
1246 /*
1247 * return current level.
1248 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1249 */
1250 u_int
1251 ipsec_get_reqlevel(isr)
1252 struct ipsecrequest *isr;
1253 {
1254 u_int level = 0;
1255 u_int esp_trans_deflev, esp_net_deflev;
1256 u_int ah_trans_deflev, ah_net_deflev;
1257
1258 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1259 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1260 ("af family mismatch, src %u, dst %u",
1261 isr->sp->spidx.src.sa.sa_family,
1262 isr->sp->spidx.dst.sa.sa_family));
1263
1264 /* XXX note that we have ipseclog() expanded here - code sync issue */
1265 #define IPSEC_CHECK_DEFAULT(lev) \
1266 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1267 && (lev) != IPSEC_LEVEL_UNIQUE) \
1268 ? (ipsec_debug \
1269 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1270 (lev), IPSEC_LEVEL_REQUIRE) \
1271 : 0), \
1272 (lev) = IPSEC_LEVEL_REQUIRE, \
1273 (lev) \
1274 : (lev))
1275
1276 /* set default level */
1277 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1278 #ifdef INET
1279 case AF_INET:
1280 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1281 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1282 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1283 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1284 break;
1285 #endif
1286 #ifdef INET6
1287 case AF_INET6:
1288 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1289 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1290 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1291 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1292 break;
1293 #endif /* INET6 */
1294 default:
1295 panic("%s: unknown af %u",
1296 __func__, isr->sp->spidx.src.sa.sa_family);
1297 }
1298
1299 #undef IPSEC_CHECK_DEFAULT
1300
1301 /* set level */
1302 switch (isr->level) {
1303 case IPSEC_LEVEL_DEFAULT:
1304 switch (isr->saidx.proto) {
1305 case IPPROTO_ESP:
1306 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1307 level = esp_net_deflev;
1308 else
1309 level = esp_trans_deflev;
1310 break;
1311 case IPPROTO_AH:
1312 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1313 level = ah_net_deflev;
1314 else
1315 level = ah_trans_deflev;
1316 break;
1317 case IPPROTO_IPCOMP:
1318 /*
1319 * we don't really care, as IPcomp document says that
1320 * we shouldn't compress small packets
1321 */
1322 level = IPSEC_LEVEL_USE;
1323 break;
1324 default:
1325 panic("%s: Illegal protocol defined %u\n", __func__,
1326 isr->saidx.proto);
1327 }
1328 break;
1329
1330 case IPSEC_LEVEL_USE:
1331 case IPSEC_LEVEL_REQUIRE:
1332 level = isr->level;
1333 break;
1334 case IPSEC_LEVEL_UNIQUE:
1335 level = IPSEC_LEVEL_REQUIRE;
1336 break;
1337
1338 default:
1339 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1340 }
1341
1342 return level;
1343 }
1344
1345 /*
1346 * Check security policy requirements against the actual
1347 * packet contents. Return one if the packet should be
1348 * reject as "invalid"; otherwiser return zero to have the
1349 * packet treated as "valid".
1350 *
1351 * OUT:
1352 * 0: valid
1353 * 1: invalid
1354 */
1355 int
1356 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1357 {
1358 struct ipsecrequest *isr;
1359 int need_auth;
1360
1361 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1362 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1363
1364 /* check policy */
1365 switch (sp->policy) {
1366 case IPSEC_POLICY_DISCARD:
1367 return 1;
1368 case IPSEC_POLICY_BYPASS:
1369 case IPSEC_POLICY_NONE:
1370 return 0;
1371 }
1372
1373 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1374 ("invalid policy %u", sp->policy));
1375
1376 /* XXX should compare policy against ipsec header history */
1377
1378 need_auth = 0;
1379 for (isr = sp->req; isr != NULL; isr = isr->next) {
1380 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1381 continue;
1382 switch (isr->saidx.proto) {
1383 case IPPROTO_ESP:
1384 if ((m->m_flags & M_DECRYPTED) == 0) {
1385 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1386 printf("%s: ESP m_flags:%x\n", __func__,
1387 m->m_flags));
1388 return 1;
1389 }
1390
1391 if (!need_auth &&
1392 isr->sav != NULL &&
1393 isr->sav->tdb_authalgxform != NULL &&
1394 (m->m_flags & M_AUTHIPDGM) == 0) {
1395 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1396 printf("%s: ESP/AH m_flags:%x\n", __func__,
1397 m->m_flags));
1398 return 1;
1399 }
1400 break;
1401 case IPPROTO_AH:
1402 need_auth = 1;
1403 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1404 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1405 printf("%s: AH m_flags:%x\n", __func__,
1406 m->m_flags));
1407 return 1;
1408 }
1409 break;
1410 case IPPROTO_IPCOMP:
1411 /*
1412 * we don't really care, as IPcomp document
1413 * says that we shouldn't compress small
1414 * packets, IPComp policy should always be
1415 * treated as being in "use" level.
1416 */
1417 break;
1418 }
1419 }
1420 return 0; /* valid */
1421 }
1422
1423 /*
1424 * Check AH/ESP integrity.
1425 * This function is called from tcp_input(), udp_input(),
1426 * and {ah,esp}4_input for tunnel mode
1427 */
1428 int
1429 ipsec4_in_reject(m, inp)
1430 struct mbuf *m;
1431 struct inpcb *inp;
1432 {
1433 struct secpolicy *sp;
1434 int error;
1435 int result;
1436
1437 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1438
1439 /* get SP for this packet.
1440 * When we are called from ip_forward(), we call
1441 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1442 */
1443 if (inp == NULL)
1444 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1445 else
1446 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1447
1448 if (sp != NULL) {
1449 result = ipsec_in_reject(sp, m);
1450 if (result)
1451 ipsec4stat.ips_in_polvio++;
1452 KEY_FREESP(&sp);
1453 } else {
1454 result = 0; /* XXX should be panic ?
1455 * -> No, there may be error. */
1456 }
1457 return result;
1458 }
1459
1460 #ifdef INET6
1461 /*
1462 * Check AH/ESP integrity.
1463 * This function is called from tcp6_input(), udp6_input(),
1464 * and {ah,esp}6_input for tunnel mode
1465 */
1466 int
1467 ipsec6_in_reject(m, inp)
1468 struct mbuf *m;
1469 struct inpcb *inp;
1470 {
1471 struct secpolicy *sp = NULL;
1472 int error;
1473 int result;
1474
1475 /* sanity check */
1476 if (m == NULL)
1477 return 0; /* XXX should be panic ? */
1478
1479 /* get SP for this packet.
1480 * When we are called from ip_forward(), we call
1481 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1482 */
1483 if (inp == NULL)
1484 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1485 else
1486 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1487
1488 if (sp != NULL) {
1489 result = ipsec_in_reject(sp, m);
1490 if (result)
1491 ipsec6stat.ips_in_polvio++;
1492 KEY_FREESP(&sp);
1493 } else {
1494 result = 0;
1495 }
1496 return result;
1497 }
1498 #endif
1499
1500 /*
1501 * compute the byte size to be occupied by IPsec header.
1502 * in case it is tunneled, it includes the size of outer IP header.
1503 * NOTE: SP passed is free in this function.
1504 */
1505 static size_t
1506 ipsec_hdrsiz(struct secpolicy *sp)
1507 {
1508 struct ipsecrequest *isr;
1509 size_t siz;
1510
1511 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1512 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1513
1514 switch (sp->policy) {
1515 case IPSEC_POLICY_DISCARD:
1516 case IPSEC_POLICY_BYPASS:
1517 case IPSEC_POLICY_NONE:
1518 return 0;
1519 }
1520
1521 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1522 ("invalid policy %u", sp->policy));
1523
1524 siz = 0;
1525 for (isr = sp->req; isr != NULL; isr = isr->next) {
1526 size_t clen = 0;
1527
1528 switch (isr->saidx.proto) {
1529 case IPPROTO_ESP:
1530 clen = esp_hdrsiz(isr->sav);
1531 break;
1532 case IPPROTO_AH:
1533 clen = ah_hdrsiz(isr->sav);
1534 break;
1535 case IPPROTO_IPCOMP:
1536 clen = sizeof(struct ipcomp);
1537 break;
1538 }
1539
1540 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1541 switch (isr->saidx.dst.sa.sa_family) {
1542 case AF_INET:
1543 clen += sizeof(struct ip);
1544 break;
1545 #ifdef INET6
1546 case AF_INET6:
1547 clen += sizeof(struct ip6_hdr);
1548 break;
1549 #endif
1550 default:
1551 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1552 "IPsec tunnel SA\n", __func__,
1553 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1554 break;
1555 }
1556 }
1557 siz += clen;
1558 }
1559
1560 return siz;
1561 }
1562
1563 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1564 size_t
1565 ipsec4_hdrsiz(m, dir, inp)
1566 struct mbuf *m;
1567 u_int dir;
1568 struct inpcb *inp;
1569 {
1570 struct secpolicy *sp;
1571 int error;
1572 size_t size;
1573
1574 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1575
1576 /* get SP for this packet.
1577 * When we are called from ip_forward(), we call
1578 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1579 */
1580 if (inp == NULL)
1581 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1582 else
1583 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1584
1585 if (sp != NULL) {
1586 size = ipsec_hdrsiz(sp);
1587 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1588 printf("%s: size:%lu.\n", __func__,
1589 (unsigned long)size));
1590
1591 KEY_FREESP(&sp);
1592 } else {
1593 size = 0; /* XXX should be panic ? */
1594 }
1595 return size;
1596 }
1597
1598 #ifdef INET6
1599 /* This function is called from ipsec6_hdrsize_tcp(),
1600 * and maybe from ip6_forward.()
1601 */
1602 size_t
1603 ipsec6_hdrsiz(m, dir, in6p)
1604 struct mbuf *m;
1605 u_int dir;
1606 struct inpcb *in6p;
1607 {
1608 struct secpolicy *sp;
1609 int error;
1610 size_t size;
1611
1612 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1613 IPSEC_ASSERT(in6p == NULL || in6p->inp_socket != NULL,
1614 ("socket w/o inpcb"));
1615
1616 /* get SP for this packet */
1617 /* XXX Is it right to call with IP_FORWARDING. */
1618 if (in6p == NULL)
1619 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1620 else
1621 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1622
1623 if (sp == NULL)
1624 return 0;
1625 size = ipsec_hdrsiz(sp);
1626 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1627 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1628 KEY_FREESP(&sp);
1629
1630 return size;
1631 }
1632 #endif /*INET6*/
1633
1634 /*
1635 * Check the variable replay window.
1636 * ipsec_chkreplay() performs replay check before ICV verification.
1637 * ipsec_updatereplay() updates replay bitmap. This must be called after
1638 * ICV verification (it also performs replay check, which is usually done
1639 * beforehand).
1640 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1641 *
1642 * based on RFC 2401.
1643 */
1644 int
1645 ipsec_chkreplay(seq, sav)
1646 u_int32_t seq;
1647 struct secasvar *sav;
1648 {
1649 const struct secreplay *replay;
1650 u_int32_t diff;
1651 int fr;
1652 u_int32_t wsizeb; /* constant: bits of window size */
1653 int frlast; /* constant: last frame */
1654
1655 IPSEC_SPLASSERT_SOFTNET(__func__);
1656
1657 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1658 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1659
1660 replay = sav->replay;
1661
1662 if (replay->wsize == 0)
1663 return 1; /* no need to check replay. */
1664
1665 /* constant */
1666 frlast = replay->wsize - 1;
1667 wsizeb = replay->wsize << 3;
1668
1669 /* sequence number of 0 is invalid */
1670 if (seq == 0)
1671 return 0;
1672
1673 /* first time is always okay */
1674 if (replay->count == 0)
1675 return 1;
1676
1677 if (seq > replay->lastseq) {
1678 /* larger sequences are okay */
1679 return 1;
1680 } else {
1681 /* seq is equal or less than lastseq. */
1682 diff = replay->lastseq - seq;
1683
1684 /* over range to check, i.e. too old or wrapped */
1685 if (diff >= wsizeb)
1686 return 0;
1687
1688 fr = frlast - diff / 8;
1689
1690 /* this packet already seen ? */
1691 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1692 return 0;
1693
1694 /* out of order but good */
1695 return 1;
1696 }
1697 }
1698
1699 /*
1700 * check replay counter whether to update or not.
1701 * OUT: 0: OK
1702 * 1: NG
1703 */
1704 int
1705 ipsec_updatereplay(seq, sav)
1706 u_int32_t seq;
1707 struct secasvar *sav;
1708 {
1709 struct secreplay *replay;
1710 u_int32_t diff;
1711 int fr;
1712 u_int32_t wsizeb; /* constant: bits of window size */
1713 int frlast; /* constant: last frame */
1714
1715 IPSEC_SPLASSERT_SOFTNET(__func__);
1716
1717 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1718 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1719
1720 replay = sav->replay;
1721
1722 if (replay->wsize == 0)
1723 goto ok; /* no need to check replay. */
1724
1725 /* constant */
1726 frlast = replay->wsize - 1;
1727 wsizeb = replay->wsize << 3;
1728
1729 /* sequence number of 0 is invalid */
1730 if (seq == 0)
1731 return 1;
1732
1733 /* first time */
1734 if (replay->count == 0) {
1735 replay->lastseq = seq;
1736 bzero(replay->bitmap, replay->wsize);
1737 (replay->bitmap)[frlast] = 1;
1738 goto ok;
1739 }
1740
1741 if (seq > replay->lastseq) {
1742 /* seq is larger than lastseq. */
1743 diff = seq - replay->lastseq;
1744
1745 /* new larger sequence number */
1746 if (diff < wsizeb) {
1747 /* In window */
1748 /* set bit for this packet */
1749 vshiftl(replay->bitmap, diff, replay->wsize);
1750 (replay->bitmap)[frlast] |= 1;
1751 } else {
1752 /* this packet has a "way larger" */
1753 bzero(replay->bitmap, replay->wsize);
1754 (replay->bitmap)[frlast] = 1;
1755 }
1756 replay->lastseq = seq;
1757
1758 /* larger is good */
1759 } else {
1760 /* seq is equal or less than lastseq. */
1761 diff = replay->lastseq - seq;
1762
1763 /* over range to check, i.e. too old or wrapped */
1764 if (diff >= wsizeb)
1765 return 1;
1766
1767 fr = frlast - diff / 8;
1768
1769 /* this packet already seen ? */
1770 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1771 return 1;
1772
1773 /* mark as seen */
1774 (replay->bitmap)[fr] |= (1 << (diff % 8));
1775
1776 /* out of order but good */
1777 }
1778
1779 ok:
1780 if (replay->count == ~0) {
1781
1782 /* set overflow flag */
1783 replay->overflow++;
1784
1785 /* don't increment, no more packets accepted */
1786 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1787 return 1;
1788
1789 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1790 __func__, replay->overflow, ipsec_logsastr(sav)));
1791 }
1792
1793 replay->count++;
1794
1795 return 0;
1796 }
1797
1798 /*
1799 * shift variable length buffer to left.
1800 * IN: bitmap: pointer to the buffer
1801 * nbit: the number of to shift.
1802 * wsize: buffer size (bytes).
1803 */
1804 static void
1805 vshiftl(bitmap, nbit, wsize)
1806 unsigned char *bitmap;
1807 int nbit, wsize;
1808 {
1809 int s, j, i;
1810 unsigned char over;
1811
1812 for (j = 0; j < nbit; j += 8) {
1813 s = (nbit - j < 8) ? (nbit - j): 8;
1814 bitmap[0] <<= s;
1815 for (i = 1; i < wsize; i++) {
1816 over = (bitmap[i] >> (8 - s));
1817 bitmap[i] <<= s;
1818 bitmap[i-1] |= over;
1819 }
1820 }
1821
1822 return;
1823 }
1824
1825 /* Return a printable string for the IPv4 address. */
1826 static char *
1827 inet_ntoa4(struct in_addr ina)
1828 {
1829 static char buf[4][4 * sizeof "123" + 4];
1830 unsigned char *ucp = (unsigned char *) &ina;
1831 static int i = 3;
1832
1833 /* XXX-BZ returns static buffer. */
1834 i = (i + 1) % 4;
1835 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1836 ucp[2] & 0xff, ucp[3] & 0xff);
1837 return (buf[i]);
1838 }
1839
1840 /* Return a printable string for the address. */
1841 char *
1842 ipsec_address(union sockaddr_union* sa)
1843 {
1844 #ifdef INET6
1845 char ip6buf[INET6_ADDRSTRLEN];
1846 #endif
1847 switch (sa->sa.sa_family) {
1848 #ifdef INET
1849 case AF_INET:
1850 return inet_ntoa4(sa->sin.sin_addr);
1851 #endif /* INET */
1852
1853 #ifdef INET6
1854 case AF_INET6:
1855 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr);
1856 #endif /* INET6 */
1857
1858 default:
1859 return "(unknown address family)";
1860 }
1861 }
1862
1863 const char *
1864 ipsec_logsastr(sav)
1865 struct secasvar *sav;
1866 {
1867 static char buf[256];
1868 char *p;
1869 struct secasindex *saidx = &sav->sah->saidx;
1870
1871 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1872 ("address family mismatch"));
1873
1874 p = buf;
1875 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1876 while (p && *p)
1877 p++;
1878 /* NB: only use ipsec_address on one address at a time */
1879 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1880 ipsec_address(&saidx->src));
1881 while (p && *p)
1882 p++;
1883 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1884 ipsec_address(&saidx->dst));
1885
1886 return buf;
1887 }
1888
1889 void
1890 ipsec_dumpmbuf(m)
1891 struct mbuf *m;
1892 {
1893 int totlen;
1894 int i;
1895 u_char *p;
1896
1897 totlen = 0;
1898 printf("---\n");
1899 while (m) {
1900 p = mtod(m, u_char *);
1901 for (i = 0; i < m->m_len; i++) {
1902 printf("%02x ", p[i]);
1903 totlen++;
1904 if (totlen % 16 == 0)
1905 printf("\n");
1906 }
1907 m = m->m_next;
1908 }
1909 if (totlen % 16 != 0)
1910 printf("\n");
1911 printf("---\n");
1912 }
1913
1914 static void
1915 ipsec_attach(void)
1916 {
1917 SECPOLICY_LOCK_INIT(&ip4_def_policy);
1918 ip4_def_policy.refcnt = 1; /* NB: disallow free */
1919 }
1920 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL);
1921
1922
1923 /* XXX this stuff doesn't belong here... */
1924
1925 static struct xformsw* xforms = NULL;
1926
1927 /*
1928 * Register a transform; typically at system startup.
1929 */
1930 void
1931 xform_register(struct xformsw* xsp)
1932 {
1933 xsp->xf_next = xforms;
1934 xforms = xsp;
1935 }
1936
1937 /*
1938 * Initialize transform support in an sav.
1939 */
1940 int
1941 xform_init(struct secasvar *sav, int xftype)
1942 {
1943 struct xformsw *xsp;
1944
1945 if (sav->tdb_xform != NULL) /* previously initialized */
1946 return 0;
1947 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1948 if (xsp->xf_type == xftype)
1949 return (*xsp->xf_init)(sav, xsp);
1950 return EINVAL;
1951 }
Cache object: 5e2bedeb1bc3056ba738e213657d98ff
|