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/protosw.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/errno.h>
50 #include <sys/time.h>
51 #include <sys/kernel.h>
52 #include <sys/syslog.h>
53 #include <sys/sysctl.h>
54 #include <sys/proc.h>
55
56 #include <net/if.h>
57 #include <net/route.h>
58
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/ip.h>
62 #include <netinet/ip_var.h>
63 #include <netinet/in_var.h>
64 #include <netinet/udp.h>
65 #include <netinet/udp_var.h>
66 #include <netinet/tcp.h>
67 #include <netinet/udp.h>
68
69 #include <netinet/ip6.h>
70 #ifdef INET6
71 #include <netinet6/ip6_var.h>
72 #endif
73 #include <netinet/in_pcb.h>
74 #ifdef INET6
75 #include <netinet/icmp6.h>
76 #endif
77
78 #include <netipsec/ipsec.h>
79 #ifdef INET6
80 #include <netipsec/ipsec6.h>
81 #endif
82 #include <netipsec/ah_var.h>
83 #include <netipsec/esp_var.h>
84 #include <netipsec/ipcomp.h> /*XXX*/
85 #include <netipsec/ipcomp_var.h>
86
87 #include <netipsec/key.h>
88 #include <netipsec/keydb.h>
89 #include <netipsec/key_debug.h>
90
91 #include <netipsec/xform.h>
92
93 #include <machine/in_cksum.h>
94
95 #include <net/net_osdep.h>
96
97 #ifdef IPSEC_DEBUG
98 int ipsec_debug = 1;
99 #else
100 int ipsec_debug = 0;
101 #endif
102
103 /* NB: name changed so netstat doesn't use it */
104 struct newipsecstat newipsecstat;
105 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
106 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
107 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
108 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
109 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
110 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
111 struct secpolicy ip4_def_policy;
112 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
113 int ip4_esp_randpad = -1;
114 /*
115 * Crypto support requirements:
116 *
117 * 1 require hardware support
118 * -1 require software support
119 * 0 take anything
120 */
121 int crypto_support = 0;
122
123 SYSCTL_DECL(_net_inet_ipsec);
124
125 /* net.inet.ipsec */
126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
127 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
129 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
131 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
133 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
135 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
137 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
139 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
141 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
143 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
145 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
147 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
148 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
149 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
150 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
151 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
152
153 #ifdef INET6
154 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
155 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
156 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
157 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
158 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
159 int ip6_esp_randpad = -1;
160
161 SYSCTL_DECL(_net_inet6_ipsec6);
162
163 /* net.inet6.ipsec6 */
164 #ifdef COMPAT_KAME
165 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
166 0,0, compat_ipsecstats_sysctl, "S", "");
167 #endif /* COMPAT_KAME */
168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
169 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
171 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
173 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
175 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
177 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
179 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
181 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
182 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
183 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
184 #endif /* INET6 */
185
186 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
187 #ifdef INET6
188 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
189 #endif
190 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
191 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
192 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
193 #ifdef INET6
194 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
195 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
196 #endif
197 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
198 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
199 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
200 int optname, caddr_t request, size_t len, int priv));
201 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
202 static void vshiftl __P((unsigned char *, int, int));
203 static size_t ipsec_hdrsiz __P((struct secpolicy *));
204
205 /*
206 * Return a held reference to the default SP.
207 */
208 static struct secpolicy *
209 key_allocsp_default(const char* where, int tag)
210 {
211 struct secpolicy *sp;
212
213 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
214 printf("DP key_allocsp_default from %s:%u\n", where, tag));
215
216 sp = &ip4_def_policy;
217 if (sp->policy != IPSEC_POLICY_DISCARD &&
218 sp->policy != IPSEC_POLICY_NONE) {
219 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
220 sp->policy, IPSEC_POLICY_NONE));
221 sp->policy = IPSEC_POLICY_NONE;
222 }
223 sp->refcnt++;
224
225 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
226 printf("DP key_allocsp_default returns SP:%p (%u)\n",
227 sp, sp->refcnt));
228 return sp;
229 }
230 #define KEY_ALLOCSP_DEFAULT() \
231 key_allocsp_default(__FILE__, __LINE__)
232
233 /*
234 * For OUTBOUND packet having a socket. Searching SPD for packet,
235 * and return a pointer to SP.
236 * OUT: NULL: no apropreate SP found, the following value is set to error.
237 * 0 : bypass
238 * EACCES : discard packet.
239 * ENOENT : ipsec_acquire() in progress, maybe.
240 * others : error occured.
241 * others: a pointer to SP
242 *
243 * NOTE: IPv6 mapped adddress concern is implemented here.
244 */
245 struct secpolicy *
246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
247 {
248 struct secpolicy *sp;
249
250 KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
251 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
252 ("ipsec_getpolicy: invalid direction %u", dir));
253
254 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
255 if (sp == NULL) /*XXX????*/
256 sp = KEY_ALLOCSP_DEFAULT();
257 KASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
258 return sp;
259 }
260
261 /*
262 * For OUTBOUND packet having a socket. Searching SPD for packet,
263 * and return a pointer to SP.
264 * OUT: NULL: no apropreate SP found, the following value is set to error.
265 * 0 : bypass
266 * EACCES : discard packet.
267 * ENOENT : ipsec_acquire() in progress, maybe.
268 * others : error occured.
269 * others: a pointer to SP
270 *
271 * NOTE: IPv6 mapped adddress concern is implemented here.
272 */
273 struct secpolicy *
274 ipsec_getpolicybysock(m, dir, inp, error)
275 struct mbuf *m;
276 u_int dir;
277 struct inpcb *inp;
278 int *error;
279 {
280 struct inpcbpolicy *pcbsp = NULL;
281 struct secpolicy *currsp = NULL; /* policy on socket */
282 struct secpolicy *sp;
283 int af;
284
285 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
286 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
287 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
288 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
289 ("ipsec_getpolicybysock: invalid direction %u", dir));
290
291 af = inp->inp_socket->so_proto->pr_domain->dom_family;
292 KASSERT(af == AF_INET || af == AF_INET6,
293 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
294
295 switch (af) {
296 case AF_INET:
297 /* set spidx in pcb */
298 *error = ipsec4_setspidx_inpcb(m, inp);
299 pcbsp = inp->inp_sp;
300 break;
301 #ifdef INET6
302 case AF_INET6:
303 /* set spidx in pcb */
304 *error = ipsec6_setspidx_in6pcb(m, inp);
305 pcbsp = inp->in6p_sp;
306 break;
307 #endif
308 default:
309 *error = EPFNOSUPPORT;
310 break;
311 }
312 if (*error)
313 return NULL;
314
315 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
316 switch (dir) {
317 case IPSEC_DIR_INBOUND:
318 currsp = pcbsp->sp_in;
319 break;
320 case IPSEC_DIR_OUTBOUND:
321 currsp = pcbsp->sp_out;
322 break;
323 }
324 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
325
326 if (pcbsp->priv) { /* when privilieged socket */
327 switch (currsp->policy) {
328 case IPSEC_POLICY_BYPASS:
329 case IPSEC_POLICY_IPSEC:
330 currsp->refcnt++;
331 sp = currsp;
332 break;
333
334 case IPSEC_POLICY_ENTRUST:
335 /* look for a policy in SPD */
336 sp = KEY_ALLOCSP(&currsp->spidx, dir);
337 if (sp == NULL) /* no SP found */
338 sp = KEY_ALLOCSP_DEFAULT();
339 break;
340
341 default:
342 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
343 "Invalid policy for PCB %d\n", currsp->policy));
344 *error = EINVAL;
345 return NULL;
346 }
347 } else { /* unpriv, SPD has policy */
348 sp = KEY_ALLOCSP(&currsp->spidx, dir);
349 if (sp == NULL) { /* no SP found */
350 switch (currsp->policy) {
351 case IPSEC_POLICY_BYPASS:
352 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
353 "Illegal policy for non-priviliged defined %d\n",
354 currsp->policy));
355 *error = EINVAL;
356 return NULL;
357
358 case IPSEC_POLICY_ENTRUST:
359 sp = KEY_ALLOCSP_DEFAULT();
360 break;
361
362 case IPSEC_POLICY_IPSEC:
363 currsp->refcnt++;
364 sp = currsp;
365 break;
366
367 default:
368 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
369 "Invalid policy for PCB %d\n", currsp->policy));
370 *error = EINVAL;
371 return NULL;
372 }
373 }
374 }
375 KASSERT(sp != NULL,
376 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
377 pcbsp->priv, currsp->policy));
378 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
379 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
380 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
381 sp, sp->refcnt));
382 return sp;
383 }
384
385 /*
386 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
387 * and return a pointer to SP.
388 * OUT: positive: a pointer to the entry for security policy leaf matched.
389 * NULL: no apropreate SP found, the following value is set to error.
390 * 0 : bypass
391 * EACCES : discard packet.
392 * ENOENT : ipsec_acquire() in progress, maybe.
393 * others : error occured.
394 */
395 struct secpolicy *
396 ipsec_getpolicybyaddr(m, dir, flag, error)
397 struct mbuf *m;
398 u_int dir;
399 int flag;
400 int *error;
401 {
402 struct secpolicyindex spidx;
403 struct secpolicy *sp;
404
405 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
406 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
407 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
408 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
409
410 sp = NULL;
411 if (key_havesp(dir)) {
412 /* Make an index to look for a policy. */
413 *error = ipsec_setspidx(m, &spidx,
414 (flag & IP_FORWARDING) ? 0 : 1);
415 if (*error != 0) {
416 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
417 " dir %u flag %u\n", dir, flag));
418 bzero(&spidx, sizeof (spidx));
419 return NULL;
420 }
421 spidx.dir = dir;
422
423 sp = KEY_ALLOCSP(&spidx, dir);
424 }
425 if (sp == NULL) /* no SP found, use system default */
426 sp = KEY_ALLOCSP_DEFAULT();
427 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
428 return sp;
429 }
430
431 struct secpolicy *
432 ipsec4_checkpolicy(m, dir, flag, error, inp)
433 struct mbuf *m;
434 u_int dir, flag;
435 int *error;
436 struct inpcb *inp;
437 {
438 struct secpolicy *sp;
439
440 *error = 0;
441 if (inp == NULL)
442 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
443 else
444 sp = ipsec_getpolicybysock(m, dir, inp, error);
445 if (sp == NULL) {
446 KASSERT(*error != 0,
447 ("ipsec4_checkpolicy: getpolicy failed w/o error"));
448 newipsecstat.ips_out_inval++;
449 return NULL;
450 }
451 KASSERT(*error == 0,
452 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
453 switch (sp->policy) {
454 case IPSEC_POLICY_ENTRUST:
455 default:
456 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
457 /* fall thru... */
458 case IPSEC_POLICY_DISCARD:
459 newipsecstat.ips_out_polvio++;
460 *error = -EINVAL; /* packet is discarded by caller */
461 break;
462 case IPSEC_POLICY_BYPASS:
463 case IPSEC_POLICY_NONE:
464 KEY_FREESP(&sp);
465 sp = NULL; /* NB: force NULL result */
466 break;
467 case IPSEC_POLICY_IPSEC:
468 if (sp->req == NULL) /* acquire an SA */
469 *error = key_spdacquire(sp);
470 break;
471 }
472 if (*error != 0) {
473 KEY_FREESP(&sp);
474 sp = NULL;
475 }
476 return sp;
477 }
478
479 static int
480 ipsec4_setspidx_inpcb(m, pcb)
481 struct mbuf *m;
482 struct inpcb *pcb;
483 {
484 int error;
485
486 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
487 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
488 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
489 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
490
491 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
492 if (error == 0) {
493 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
494 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
495 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
496 } else {
497 bzero(&pcb->inp_sp->sp_in->spidx,
498 sizeof (pcb->inp_sp->sp_in->spidx));
499 bzero(&pcb->inp_sp->sp_out->spidx,
500 sizeof (pcb->inp_sp->sp_in->spidx));
501 }
502 return error;
503 }
504
505 #ifdef INET6
506 static int
507 ipsec6_setspidx_in6pcb(m, pcb)
508 struct mbuf *m;
509 struct in6pcb *pcb;
510 {
511 struct secpolicyindex *spidx;
512 int error;
513
514 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
515 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
516 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
517 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
518
519 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
520 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
521
522 spidx = &pcb->in6p_sp->sp_in->spidx;
523 error = ipsec_setspidx(m, spidx, 1);
524 if (error)
525 goto bad;
526 spidx->dir = IPSEC_DIR_INBOUND;
527
528 spidx = &pcb->in6p_sp->sp_out->spidx;
529 error = ipsec_setspidx(m, spidx, 1);
530 if (error)
531 goto bad;
532 spidx->dir = IPSEC_DIR_OUTBOUND;
533
534 return 0;
535
536 bad:
537 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
538 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
539 return error;
540 }
541 #endif
542
543 /*
544 * configure security policy index (src/dst/proto/sport/dport)
545 * by looking at the content of mbuf.
546 * the caller is responsible for error recovery (like clearing up spidx).
547 */
548 static int
549 ipsec_setspidx(m, spidx, needport)
550 struct mbuf *m;
551 struct secpolicyindex *spidx;
552 int needport;
553 {
554 struct ip *ip = NULL;
555 struct ip ipbuf;
556 u_int v;
557 struct mbuf *n;
558 int len;
559 int error;
560
561 KASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
562
563 /*
564 * validate m->m_pkthdr.len. we see incorrect length if we
565 * mistakenly call this function with inconsistent mbuf chain
566 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
567 */
568 len = 0;
569 for (n = m; n; n = n->m_next)
570 len += n->m_len;
571 if (m->m_pkthdr.len != len) {
572 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
573 printf("ipsec_setspidx: "
574 "total of m_len(%d) != pkthdr.len(%d), "
575 "ignored.\n",
576 len, m->m_pkthdr.len));
577 return EINVAL;
578 }
579
580 if (m->m_pkthdr.len < sizeof(struct ip)) {
581 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
582 printf("ipsec_setspidx: "
583 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
584 m->m_pkthdr.len));
585 return EINVAL;
586 }
587
588 if (m->m_len >= sizeof(*ip))
589 ip = mtod(m, struct ip *);
590 else {
591 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
592 ip = &ipbuf;
593 }
594 #ifdef _IP_VHL
595 v = _IP_VHL_V(ip->ip_vhl);
596 #else
597 v = ip->ip_v;
598 #endif
599 switch (v) {
600 case 4:
601 error = ipsec4_setspidx_ipaddr(m, spidx);
602 if (error)
603 return error;
604 ipsec4_get_ulp(m, spidx, needport);
605 return 0;
606 #ifdef INET6
607 case 6:
608 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
609 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
610 printf("ipsec_setspidx: "
611 "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
612 "ignored.\n", m->m_pkthdr.len));
613 return EINVAL;
614 }
615 error = ipsec6_setspidx_ipaddr(m, spidx);
616 if (error)
617 return error;
618 ipsec6_get_ulp(m, spidx, needport);
619 return 0;
620 #endif
621 default:
622 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
623 printf("ipsec_setspidx: "
624 "unknown IP version %u, ignored.\n", v));
625 return EINVAL;
626 }
627 }
628
629 static void
630 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
631 {
632 u_int8_t nxt;
633 int off;
634
635 /* sanity check */
636 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
637 KASSERT(m->m_pkthdr.len >= sizeof(struct ip),
638 ("ipsec4_get_ulp: packet too short"));
639
640 /* NB: ip_input() flips it into host endian XXX need more checking */
641 if (m->m_len < sizeof (struct ip)) {
642 struct ip *ip = mtod(m, struct ip *);
643 if (ip->ip_off & (IP_MF | IP_OFFMASK))
644 goto done;
645 #ifdef _IP_VHL
646 off = _IP_VHL_HL(ip->ip_vhl) << 2;
647 #else
648 off = ip->ip_hl << 2;
649 #endif
650 nxt = ip->ip_p;
651 } else {
652 struct ip ih;
653
654 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
655 if (ih.ip_off & (IP_MF | IP_OFFMASK))
656 goto done;
657 #ifdef _IP_VHL
658 off = _IP_VHL_HL(ih.ip_vhl) << 2;
659 #else
660 off = ih.ip_hl << 2;
661 #endif
662 nxt = ih.ip_p;
663 }
664
665 while (off < m->m_pkthdr.len) {
666 struct ip6_ext ip6e;
667 struct tcphdr th;
668 struct udphdr uh;
669
670 switch (nxt) {
671 case IPPROTO_TCP:
672 spidx->ul_proto = nxt;
673 if (!needport)
674 goto done_proto;
675 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
676 goto done;
677 m_copydata(m, off, sizeof (th), (caddr_t) &th);
678 spidx->src.sin.sin_port = th.th_sport;
679 spidx->dst.sin.sin_port = th.th_dport;
680 return;
681 case IPPROTO_UDP:
682 spidx->ul_proto = nxt;
683 if (!needport)
684 goto done_proto;
685 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
686 goto done;
687 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
688 spidx->src.sin.sin_port = uh.uh_sport;
689 spidx->dst.sin.sin_port = uh.uh_dport;
690 return;
691 case IPPROTO_AH:
692 if (m->m_pkthdr.len > off + sizeof(ip6e))
693 goto done;
694 /* XXX sigh, this works but is totally bogus */
695 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
696 off += (ip6e.ip6e_len + 2) << 2;
697 nxt = ip6e.ip6e_nxt;
698 break;
699 case IPPROTO_ICMP:
700 default:
701 /* XXX intermediate headers??? */
702 spidx->ul_proto = nxt;
703 goto done_proto;
704 }
705 }
706 done:
707 spidx->ul_proto = IPSEC_ULPROTO_ANY;
708 done_proto:
709 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
710 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
711 }
712
713 /* assumes that m is sane */
714 static int
715 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
716 {
717 static const struct sockaddr_in template = {
718 sizeof (struct sockaddr_in),
719 AF_INET,
720 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
721 };
722
723 spidx->src.sin = template;
724 spidx->dst.sin = template;
725
726 if (m->m_len < sizeof (struct ip)) {
727 m_copydata(m, offsetof(struct ip, ip_src),
728 sizeof (struct in_addr),
729 (caddr_t) &spidx->src.sin.sin_addr);
730 m_copydata(m, offsetof(struct ip, ip_dst),
731 sizeof (struct in_addr),
732 (caddr_t) &spidx->dst.sin.sin_addr);
733 } else {
734 struct ip *ip = mtod(m, struct ip *);
735 spidx->src.sin.sin_addr = ip->ip_src;
736 spidx->dst.sin.sin_addr = ip->ip_dst;
737 }
738
739 spidx->prefs = sizeof(struct in_addr) << 3;
740 spidx->prefd = sizeof(struct in_addr) << 3;
741
742 return 0;
743 }
744
745 #ifdef INET6
746 static void
747 ipsec6_get_ulp(m, spidx, needport)
748 struct mbuf *m;
749 struct secpolicyindex *spidx;
750 int needport;
751 {
752 int off, nxt;
753 struct tcphdr th;
754 struct udphdr uh;
755
756 /* sanity check */
757 if (m == NULL)
758 panic("ipsec6_get_ulp: NULL pointer was passed.\n");
759
760 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
761 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
762
763 /* set default */
764 spidx->ul_proto = IPSEC_ULPROTO_ANY;
765 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
766 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
767
768 nxt = -1;
769 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
770 if (off < 0 || m->m_pkthdr.len < off)
771 return;
772
773 switch (nxt) {
774 case IPPROTO_TCP:
775 spidx->ul_proto = nxt;
776 if (!needport)
777 break;
778 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
779 break;
780 m_copydata(m, off, sizeof(th), (caddr_t)&th);
781 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
782 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
783 break;
784 case IPPROTO_UDP:
785 spidx->ul_proto = nxt;
786 if (!needport)
787 break;
788 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
789 break;
790 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
791 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
792 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
793 break;
794 case IPPROTO_ICMPV6:
795 default:
796 /* XXX intermediate headers??? */
797 spidx->ul_proto = nxt;
798 break;
799 }
800 }
801
802 /* assumes that m is sane */
803 static int
804 ipsec6_setspidx_ipaddr(m, spidx)
805 struct mbuf *m;
806 struct secpolicyindex *spidx;
807 {
808 struct ip6_hdr *ip6 = NULL;
809 struct ip6_hdr ip6buf;
810 struct sockaddr_in6 *sin6;
811
812 if (m->m_len >= sizeof(*ip6))
813 ip6 = mtod(m, struct ip6_hdr *);
814 else {
815 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
816 ip6 = &ip6buf;
817 }
818
819 sin6 = (struct sockaddr_in6 *)&spidx->src;
820 bzero(sin6, sizeof(*sin6));
821 sin6->sin6_family = AF_INET6;
822 sin6->sin6_len = sizeof(struct sockaddr_in6);
823 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
824 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
825 sin6->sin6_addr.s6_addr16[1] = 0;
826 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
827 }
828 spidx->prefs = sizeof(struct in6_addr) << 3;
829
830 sin6 = (struct sockaddr_in6 *)&spidx->dst;
831 bzero(sin6, sizeof(*sin6));
832 sin6->sin6_family = AF_INET6;
833 sin6->sin6_len = sizeof(struct sockaddr_in6);
834 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
835 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
836 sin6->sin6_addr.s6_addr16[1] = 0;
837 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
838 }
839 spidx->prefd = sizeof(struct in6_addr) << 3;
840
841 return 0;
842 }
843 #endif
844
845 static void
846 ipsec_delpcbpolicy(p)
847 struct inpcbpolicy *p;
848 {
849 free(p, M_SECA);
850 }
851
852 /* initialize policy in PCB */
853 int
854 ipsec_init_policy(so, pcb_sp)
855 struct socket *so;
856 struct inpcbpolicy **pcb_sp;
857 {
858 struct inpcbpolicy *new;
859
860 /* sanity check. */
861 if (so == NULL || pcb_sp == NULL)
862 panic("ipsec_init_policy: NULL pointer was passed.\n");
863
864 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
865 M_SECA, M_NOWAIT|M_ZERO);
866 if (new == NULL) {
867 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
868 return ENOBUFS;
869 }
870
871 if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
872 new->priv = 1;
873 else
874 new->priv = 0;
875
876 if ((new->sp_in = KEY_NEWSP()) == NULL) {
877 ipsec_delpcbpolicy(new);
878 return ENOBUFS;
879 }
880 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
881 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
882
883 if ((new->sp_out = KEY_NEWSP()) == NULL) {
884 KEY_FREESP(&new->sp_in);
885 ipsec_delpcbpolicy(new);
886 return ENOBUFS;
887 }
888 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
889 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
890
891 *pcb_sp = new;
892
893 return 0;
894 }
895
896 /* copy old ipsec policy into new */
897 int
898 ipsec_copy_policy(old, new)
899 struct inpcbpolicy *old, *new;
900 {
901 struct secpolicy *sp;
902
903 sp = ipsec_deepcopy_policy(old->sp_in);
904 if (sp) {
905 KEY_FREESP(&new->sp_in);
906 new->sp_in = sp;
907 } else
908 return ENOBUFS;
909
910 sp = ipsec_deepcopy_policy(old->sp_out);
911 if (sp) {
912 KEY_FREESP(&new->sp_out);
913 new->sp_out = sp;
914 } else
915 return ENOBUFS;
916
917 new->priv = old->priv;
918
919 return 0;
920 }
921
922 /* deep-copy a policy in PCB */
923 static struct secpolicy *
924 ipsec_deepcopy_policy(src)
925 struct secpolicy *src;
926 {
927 struct ipsecrequest *newchain = NULL;
928 struct ipsecrequest *p;
929 struct ipsecrequest **q;
930 struct ipsecrequest *r;
931 struct secpolicy *dst;
932
933 if (src == NULL)
934 return NULL;
935 dst = KEY_NEWSP();
936 if (dst == NULL)
937 return NULL;
938
939 /*
940 * deep-copy IPsec request chain. This is required since struct
941 * ipsecrequest is not reference counted.
942 */
943 q = &newchain;
944 for (p = src->req; p; p = p->next) {
945 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
946 M_SECA, M_NOWAIT);
947 if (*q == NULL)
948 goto fail;
949 bzero(*q, sizeof(**q));
950 (*q)->next = NULL;
951
952 (*q)->saidx.proto = p->saidx.proto;
953 (*q)->saidx.mode = p->saidx.mode;
954 (*q)->level = p->level;
955 (*q)->saidx.reqid = p->saidx.reqid;
956
957 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
958 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
959
960 (*q)->sav = NULL;
961 (*q)->sp = dst;
962
963 q = &((*q)->next);
964 }
965
966 dst->req = newchain;
967 dst->state = src->state;
968 dst->policy = src->policy;
969 /* do not touch the refcnt fields */
970
971 return dst;
972
973 fail:
974 for (p = newchain; p; p = r) {
975 r = p->next;
976 free(p, M_SECA);
977 p = NULL;
978 }
979 return NULL;
980 }
981
982 /* set policy and ipsec request if present. */
983 static int
984 ipsec_set_policy(pcb_sp, optname, request, len, priv)
985 struct secpolicy **pcb_sp;
986 int optname;
987 caddr_t request;
988 size_t len;
989 int priv;
990 {
991 struct sadb_x_policy *xpl;
992 struct secpolicy *newsp = NULL;
993 int error;
994
995 /* sanity check. */
996 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
997 return EINVAL;
998 if (len < sizeof(*xpl))
999 return EINVAL;
1000 xpl = (struct sadb_x_policy *)request;
1001
1002 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1003 printf("ipsec_set_policy: passed policy\n");
1004 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1005
1006 /* check policy type */
1007 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1008 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1009 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1010 return EINVAL;
1011
1012 /* check privileged socket */
1013 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1014 return EACCES;
1015
1016 /* allocation new SP entry */
1017 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1018 return error;
1019
1020 newsp->state = IPSEC_SPSTATE_ALIVE;
1021
1022 /* clear old SP and set new SP */
1023 KEY_FREESP(pcb_sp);
1024 *pcb_sp = newsp;
1025 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1026 printf("ipsec_set_policy: new policy\n");
1027 kdebug_secpolicy(newsp));
1028
1029 return 0;
1030 }
1031
1032 static int
1033 ipsec_get_policy(pcb_sp, mp)
1034 struct secpolicy *pcb_sp;
1035 struct mbuf **mp;
1036 {
1037
1038 /* sanity check. */
1039 if (pcb_sp == NULL || mp == NULL)
1040 return EINVAL;
1041
1042 *mp = key_sp2msg(pcb_sp);
1043 if (!*mp) {
1044 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1045 return ENOBUFS;
1046 }
1047
1048 (*mp)->m_type = MT_DATA;
1049 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1050 printf("ipsec_get_policy:\n");
1051 kdebug_mbuf(*mp));
1052
1053 return 0;
1054 }
1055
1056 int
1057 ipsec4_set_policy(inp, optname, request, len, priv)
1058 struct inpcb *inp;
1059 int optname;
1060 caddr_t request;
1061 size_t len;
1062 int priv;
1063 {
1064 struct sadb_x_policy *xpl;
1065 struct secpolicy **pcb_sp;
1066
1067 /* sanity check. */
1068 if (inp == NULL || request == NULL)
1069 return EINVAL;
1070 if (len < sizeof(*xpl))
1071 return EINVAL;
1072 xpl = (struct sadb_x_policy *)request;
1073
1074 /* select direction */
1075 switch (xpl->sadb_x_policy_dir) {
1076 case IPSEC_DIR_INBOUND:
1077 pcb_sp = &inp->inp_sp->sp_in;
1078 break;
1079 case IPSEC_DIR_OUTBOUND:
1080 pcb_sp = &inp->inp_sp->sp_out;
1081 break;
1082 default:
1083 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1084 xpl->sadb_x_policy_dir));
1085 return EINVAL;
1086 }
1087
1088 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1089 }
1090
1091 int
1092 ipsec4_get_policy(inp, request, len, mp)
1093 struct inpcb *inp;
1094 caddr_t request;
1095 size_t len;
1096 struct mbuf **mp;
1097 {
1098 struct sadb_x_policy *xpl;
1099 struct secpolicy *pcb_sp;
1100
1101 /* sanity check. */
1102 if (inp == NULL || request == NULL || mp == NULL)
1103 return EINVAL;
1104 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1105 if (len < sizeof(*xpl))
1106 return EINVAL;
1107 xpl = (struct sadb_x_policy *)request;
1108
1109 /* select direction */
1110 switch (xpl->sadb_x_policy_dir) {
1111 case IPSEC_DIR_INBOUND:
1112 pcb_sp = inp->inp_sp->sp_in;
1113 break;
1114 case IPSEC_DIR_OUTBOUND:
1115 pcb_sp = inp->inp_sp->sp_out;
1116 break;
1117 default:
1118 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1119 xpl->sadb_x_policy_dir));
1120 return EINVAL;
1121 }
1122
1123 return ipsec_get_policy(pcb_sp, mp);
1124 }
1125
1126 /* delete policy in PCB */
1127 int
1128 ipsec4_delete_pcbpolicy(inp)
1129 struct inpcb *inp;
1130 {
1131 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1132
1133 if (inp->inp_sp == NULL)
1134 return 0;
1135
1136 if (inp->inp_sp->sp_in != NULL)
1137 KEY_FREESP(&inp->inp_sp->sp_in);
1138
1139 if (inp->inp_sp->sp_out != NULL)
1140 KEY_FREESP(&inp->inp_sp->sp_out);
1141
1142 ipsec_delpcbpolicy(inp->inp_sp);
1143 inp->inp_sp = NULL;
1144
1145 return 0;
1146 }
1147
1148 #ifdef INET6
1149 int
1150 ipsec6_set_policy(in6p, optname, request, len, priv)
1151 struct in6pcb *in6p;
1152 int optname;
1153 caddr_t request;
1154 size_t len;
1155 int priv;
1156 {
1157 struct sadb_x_policy *xpl;
1158 struct secpolicy **pcb_sp;
1159
1160 /* sanity check. */
1161 if (in6p == NULL || request == NULL)
1162 return EINVAL;
1163 if (len < sizeof(*xpl))
1164 return EINVAL;
1165 xpl = (struct sadb_x_policy *)request;
1166
1167 /* select direction */
1168 switch (xpl->sadb_x_policy_dir) {
1169 case IPSEC_DIR_INBOUND:
1170 pcb_sp = &in6p->in6p_sp->sp_in;
1171 break;
1172 case IPSEC_DIR_OUTBOUND:
1173 pcb_sp = &in6p->in6p_sp->sp_out;
1174 break;
1175 default:
1176 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1177 xpl->sadb_x_policy_dir));
1178 return EINVAL;
1179 }
1180
1181 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1182 }
1183
1184 int
1185 ipsec6_get_policy(in6p, request, len, mp)
1186 struct in6pcb *in6p;
1187 caddr_t request;
1188 size_t len;
1189 struct mbuf **mp;
1190 {
1191 struct sadb_x_policy *xpl;
1192 struct secpolicy *pcb_sp;
1193
1194 /* sanity check. */
1195 if (in6p == NULL || request == NULL || mp == NULL)
1196 return EINVAL;
1197 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1198 if (len < sizeof(*xpl))
1199 return EINVAL;
1200 xpl = (struct sadb_x_policy *)request;
1201
1202 /* select direction */
1203 switch (xpl->sadb_x_policy_dir) {
1204 case IPSEC_DIR_INBOUND:
1205 pcb_sp = in6p->in6p_sp->sp_in;
1206 break;
1207 case IPSEC_DIR_OUTBOUND:
1208 pcb_sp = in6p->in6p_sp->sp_out;
1209 break;
1210 default:
1211 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1212 xpl->sadb_x_policy_dir));
1213 return EINVAL;
1214 }
1215
1216 return ipsec_get_policy(pcb_sp, mp);
1217 }
1218
1219 int
1220 ipsec6_delete_pcbpolicy(in6p)
1221 struct in6pcb *in6p;
1222 {
1223 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1224
1225 if (in6p->in6p_sp == NULL)
1226 return 0;
1227
1228 if (in6p->in6p_sp->sp_in != NULL)
1229 KEY_FREESP(&in6p->in6p_sp->sp_in);
1230
1231 if (in6p->in6p_sp->sp_out != NULL)
1232 KEY_FREESP(&in6p->in6p_sp->sp_out);
1233
1234 ipsec_delpcbpolicy(in6p->in6p_sp);
1235 in6p->in6p_sp = NULL;
1236
1237 return 0;
1238 }
1239 #endif
1240
1241 /*
1242 * return current level.
1243 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1244 */
1245 u_int
1246 ipsec_get_reqlevel(isr)
1247 struct ipsecrequest *isr;
1248 {
1249 u_int level = 0;
1250 u_int esp_trans_deflev, esp_net_deflev;
1251 u_int ah_trans_deflev, ah_net_deflev;
1252
1253 KASSERT(isr != NULL && isr->sp != NULL,
1254 ("ipsec_get_reqlevel: null argument"));
1255 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1256 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1257 isr->sp->spidx.src.sa.sa_family,
1258 isr->sp->spidx.dst.sa.sa_family));
1259
1260 /* XXX note that we have ipseclog() expanded here - code sync issue */
1261 #define IPSEC_CHECK_DEFAULT(lev) \
1262 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1263 && (lev) != IPSEC_LEVEL_UNIQUE) \
1264 ? (ipsec_debug \
1265 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1266 (lev), IPSEC_LEVEL_REQUIRE) \
1267 : 0), \
1268 (lev) = IPSEC_LEVEL_REQUIRE, \
1269 (lev) \
1270 : (lev))
1271
1272 /* set default level */
1273 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1274 #ifdef INET
1275 case AF_INET:
1276 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1277 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1278 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1279 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1280 break;
1281 #endif
1282 #ifdef INET6
1283 case AF_INET6:
1284 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1285 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1286 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1287 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1288 break;
1289 #endif /* INET6 */
1290 default:
1291 panic("key_get_reqlevel: unknown af %u",
1292 isr->sp->spidx.src.sa.sa_family);
1293 }
1294
1295 #undef IPSEC_CHECK_DEFAULT
1296
1297 /* set level */
1298 switch (isr->level) {
1299 case IPSEC_LEVEL_DEFAULT:
1300 switch (isr->saidx.proto) {
1301 case IPPROTO_ESP:
1302 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1303 level = esp_net_deflev;
1304 else
1305 level = esp_trans_deflev;
1306 break;
1307 case IPPROTO_AH:
1308 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1309 level = ah_net_deflev;
1310 else
1311 level = ah_trans_deflev;
1312 case IPPROTO_IPCOMP:
1313 /*
1314 * we don't really care, as IPcomp document says that
1315 * we shouldn't compress small packets
1316 */
1317 level = IPSEC_LEVEL_USE;
1318 break;
1319 default:
1320 panic("ipsec_get_reqlevel: "
1321 "Illegal protocol defined %u\n",
1322 isr->saidx.proto);
1323 }
1324 break;
1325
1326 case IPSEC_LEVEL_USE:
1327 case IPSEC_LEVEL_REQUIRE:
1328 level = isr->level;
1329 break;
1330 case IPSEC_LEVEL_UNIQUE:
1331 level = IPSEC_LEVEL_REQUIRE;
1332 break;
1333
1334 default:
1335 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
1336 isr->level);
1337 }
1338
1339 return level;
1340 }
1341
1342 /*
1343 * Check security policy requirements against the actual
1344 * packet contents. Return one if the packet should be
1345 * reject as "invalid"; otherwiser return zero to have the
1346 * packet treated as "valid".
1347 *
1348 * OUT:
1349 * 0: valid
1350 * 1: invalid
1351 */
1352 int
1353 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1354 {
1355 struct ipsecrequest *isr;
1356 int need_auth;
1357
1358 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1359 printf("ipsec_in_reject: using SP\n");
1360 kdebug_secpolicy(sp));
1361
1362 /* check policy */
1363 switch (sp->policy) {
1364 case IPSEC_POLICY_DISCARD:
1365 return 1;
1366 case IPSEC_POLICY_BYPASS:
1367 case IPSEC_POLICY_NONE:
1368 return 0;
1369 }
1370
1371 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1372 ("ipsec_in_reject: invalid policy %u", sp->policy));
1373
1374 /* XXX should compare policy against ipsec header history */
1375
1376 need_auth = 0;
1377 for (isr = sp->req; isr != NULL; isr = isr->next) {
1378 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1379 continue;
1380 switch (isr->saidx.proto) {
1381 case IPPROTO_ESP:
1382 if ((m->m_flags & M_DECRYPTED) == 0) {
1383 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1384 printf("ipsec_in_reject: ESP m_flags:%x\n",
1385 m->m_flags));
1386 return 1;
1387 }
1388
1389 if (!need_auth &&
1390 isr->sav != NULL &&
1391 isr->sav->tdb_authalgxform != NULL &&
1392 (m->m_flags & M_AUTHIPDGM) == 0) {
1393 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1394 printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1395 m->m_flags));
1396 return 1;
1397 }
1398 break;
1399 case IPPROTO_AH:
1400 need_auth = 1;
1401 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1402 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1403 printf("ipsec_in_reject: AH m_flags:%x\n",
1404 m->m_flags));
1405 return 1;
1406 }
1407 break;
1408 case IPPROTO_IPCOMP:
1409 /*
1410 * we don't really care, as IPcomp document
1411 * says that we shouldn't compress small
1412 * packets, IPComp policy should always be
1413 * treated as being in "use" level.
1414 */
1415 break;
1416 }
1417 }
1418 return 0; /* valid */
1419 }
1420
1421 /*
1422 * Check AH/ESP integrity.
1423 * This function is called from tcp_input(), udp_input(),
1424 * and {ah,esp}4_input for tunnel mode
1425 */
1426 int
1427 ipsec4_in_reject(m, inp)
1428 struct mbuf *m;
1429 struct inpcb *inp;
1430 {
1431 struct secpolicy *sp;
1432 int error;
1433 int result;
1434
1435 KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1436
1437 /* get SP for this packet.
1438 * When we are called from ip_forward(), we call
1439 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1440 */
1441 if (inp == NULL)
1442 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1443 else
1444 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1445
1446 if (sp != NULL) {
1447 result = ipsec_in_reject(sp, m);
1448 if (result)
1449 newipsecstat.ips_in_polvio++;
1450 KEY_FREESP(&sp);
1451 } else {
1452 result = 0; /* XXX should be panic ?
1453 * -> No, there may be error. */
1454 }
1455 return result;
1456 }
1457
1458 #ifdef INET6
1459 /*
1460 * Check AH/ESP integrity.
1461 * This function is called from tcp6_input(), udp6_input(),
1462 * and {ah,esp}6_input for tunnel mode
1463 */
1464 int
1465 ipsec6_in_reject(m, inp)
1466 struct mbuf *m;
1467 struct inpcb *inp;
1468 {
1469 struct secpolicy *sp = NULL;
1470 int error;
1471 int result;
1472
1473 /* sanity check */
1474 if (m == NULL)
1475 return 0; /* XXX should be panic ? */
1476
1477 /* get SP for this packet.
1478 * When we are called from ip_forward(), we call
1479 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1480 */
1481 if (inp == NULL)
1482 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1483 else
1484 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1485
1486 if (sp != NULL) {
1487 result = ipsec_in_reject(sp, m);
1488 if (result)
1489 newipsecstat.ips_in_polvio++;
1490 KEY_FREESP(&sp);
1491 } else {
1492 result = 0;
1493 }
1494 return result;
1495 }
1496 #endif
1497
1498 /*
1499 * compute the byte size to be occupied by IPsec header.
1500 * in case it is tunneled, it includes the size of outer IP header.
1501 * NOTE: SP passed is free in this function.
1502 */
1503 static size_t
1504 ipsec_hdrsiz(struct secpolicy *sp)
1505 {
1506 struct ipsecrequest *isr;
1507 size_t siz;
1508
1509 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1510 printf("ipsec_hdrsiz: using SP\n");
1511 kdebug_secpolicy(sp));
1512
1513 switch (sp->policy) {
1514 case IPSEC_POLICY_DISCARD:
1515 case IPSEC_POLICY_BYPASS:
1516 case IPSEC_POLICY_NONE:
1517 return 0;
1518 }
1519
1520 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1521 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1522
1523 siz = 0;
1524 for (isr = sp->req; isr != NULL; isr = isr->next) {
1525 size_t clen = 0;
1526
1527 switch (isr->saidx.proto) {
1528 case IPPROTO_ESP:
1529 clen = esp_hdrsiz(isr->sav);
1530 break;
1531 case IPPROTO_AH:
1532 clen = ah_hdrsiz(isr->sav);
1533 break;
1534 case IPPROTO_IPCOMP:
1535 clen = sizeof(struct ipcomp);
1536 break;
1537 }
1538
1539 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1540 switch (isr->saidx.dst.sa.sa_family) {
1541 case AF_INET:
1542 clen += sizeof(struct ip);
1543 break;
1544 #ifdef INET6
1545 case AF_INET6:
1546 clen += sizeof(struct ip6_hdr);
1547 break;
1548 #endif
1549 default:
1550 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1551 "unknown AF %d in IPsec tunnel SA\n",
1552 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1553 break;
1554 }
1555 }
1556 siz += clen;
1557 }
1558
1559 return siz;
1560 }
1561
1562 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1563 size_t
1564 ipsec4_hdrsiz(m, dir, inp)
1565 struct mbuf *m;
1566 u_int dir;
1567 struct inpcb *inp;
1568 {
1569 struct secpolicy *sp;
1570 int error;
1571 size_t size;
1572
1573 KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1574 KASSERT(inp == NULL || inp->inp_socket != NULL,
1575 ("ipsec4_hdrsize: socket w/o inpcb"));
1576
1577 /* get SP for this packet.
1578 * When we are called from ip_forward(), we call
1579 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1580 */
1581 if (inp == NULL)
1582 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1583 else
1584 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1585
1586 if (sp != NULL) {
1587 size = ipsec_hdrsiz(sp);
1588 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1589 printf("ipsec4_hdrsiz: size:%lu.\n",
1590 (unsigned long)size));
1591
1592 KEY_FREESP(&sp);
1593 } else {
1594 size = 0; /* XXX should be panic ? */
1595 }
1596 return size;
1597 }
1598
1599 #ifdef INET6
1600 /* This function is called from ipsec6_hdrsize_tcp(),
1601 * and maybe from ip6_forward.()
1602 */
1603 size_t
1604 ipsec6_hdrsiz(m, dir, in6p)
1605 struct mbuf *m;
1606 u_int dir;
1607 struct in6pcb *in6p;
1608 {
1609 struct secpolicy *sp;
1610 int error;
1611 size_t size;
1612
1613 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1614 KASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1615 ("ipsec6_hdrsize: socket w/o inpcb"));
1616
1617 /* get SP for this packet */
1618 /* XXX Is it right to call with IP_FORWARDING. */
1619 if (in6p == NULL)
1620 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1621 else
1622 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1623
1624 if (sp == NULL)
1625 return 0;
1626 size = ipsec_hdrsiz(sp);
1627 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1628 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1629 KEY_FREESP(&sp);
1630
1631 return size;
1632 }
1633 #endif /*INET6*/
1634
1635 /*
1636 * Check the variable replay window.
1637 * ipsec_chkreplay() performs replay check before ICV verification.
1638 * ipsec_updatereplay() updates replay bitmap. This must be called after
1639 * ICV verification (it also performs replay check, which is usually done
1640 * beforehand).
1641 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1642 *
1643 * based on RFC 2401.
1644 */
1645 int
1646 ipsec_chkreplay(seq, sav)
1647 u_int32_t seq;
1648 struct secasvar *sav;
1649 {
1650 const struct secreplay *replay;
1651 u_int32_t diff;
1652 int fr;
1653 u_int32_t wsizeb; /* constant: bits of window size */
1654 int frlast; /* constant: last frame */
1655
1656 SPLASSERT(net, "ipsec_chkreplay");
1657
1658 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1659 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1660
1661 replay = sav->replay;
1662
1663 if (replay->wsize == 0)
1664 return 1; /* no need to check replay. */
1665
1666 /* constant */
1667 frlast = replay->wsize - 1;
1668 wsizeb = replay->wsize << 3;
1669
1670 /* sequence number of 0 is invalid */
1671 if (seq == 0)
1672 return 0;
1673
1674 /* first time is always okay */
1675 if (replay->count == 0)
1676 return 1;
1677
1678 if (seq > replay->lastseq) {
1679 /* larger sequences are okay */
1680 return 1;
1681 } else {
1682 /* seq is equal or less than lastseq. */
1683 diff = replay->lastseq - seq;
1684
1685 /* over range to check, i.e. too old or wrapped */
1686 if (diff >= wsizeb)
1687 return 0;
1688
1689 fr = frlast - diff / 8;
1690
1691 /* this packet already seen ? */
1692 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1693 return 0;
1694
1695 /* out of order but good */
1696 return 1;
1697 }
1698 }
1699
1700 /*
1701 * check replay counter whether to update or not.
1702 * OUT: 0: OK
1703 * 1: NG
1704 */
1705 int
1706 ipsec_updatereplay(seq, sav)
1707 u_int32_t seq;
1708 struct secasvar *sav;
1709 {
1710 struct secreplay *replay;
1711 u_int32_t diff;
1712 int fr;
1713 u_int32_t wsizeb; /* constant: bits of window size */
1714 int frlast; /* constant: last frame */
1715
1716 SPLASSERT(net, "ipsec_updatereplay");
1717
1718 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
1719 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
1720
1721 replay = sav->replay;
1722
1723 if (replay->wsize == 0)
1724 goto ok; /* no need to check replay. */
1725
1726 /* constant */
1727 frlast = replay->wsize - 1;
1728 wsizeb = replay->wsize << 3;
1729
1730 /* sequence number of 0 is invalid */
1731 if (seq == 0)
1732 return 1;
1733
1734 /* first time */
1735 if (replay->count == 0) {
1736 replay->lastseq = seq;
1737 bzero(replay->bitmap, replay->wsize);
1738 (replay->bitmap)[frlast] = 1;
1739 goto ok;
1740 }
1741
1742 if (seq > replay->lastseq) {
1743 /* seq is larger than lastseq. */
1744 diff = seq - replay->lastseq;
1745
1746 /* new larger sequence number */
1747 if (diff < wsizeb) {
1748 /* In window */
1749 /* set bit for this packet */
1750 vshiftl(replay->bitmap, diff, replay->wsize);
1751 (replay->bitmap)[frlast] |= 1;
1752 } else {
1753 /* this packet has a "way larger" */
1754 bzero(replay->bitmap, replay->wsize);
1755 (replay->bitmap)[frlast] = 1;
1756 }
1757 replay->lastseq = seq;
1758
1759 /* larger is good */
1760 } else {
1761 /* seq is equal or less than lastseq. */
1762 diff = replay->lastseq - seq;
1763
1764 /* over range to check, i.e. too old or wrapped */
1765 if (diff >= wsizeb)
1766 return 1;
1767
1768 fr = frlast - diff / 8;
1769
1770 /* this packet already seen ? */
1771 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1772 return 1;
1773
1774 /* mark as seen */
1775 (replay->bitmap)[fr] |= (1 << (diff % 8));
1776
1777 /* out of order but good */
1778 }
1779
1780 ok:
1781 if (replay->count == ~0) {
1782
1783 /* set overflow flag */
1784 replay->overflow++;
1785
1786 /* don't increment, no more packets accepted */
1787 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1788 return 1;
1789
1790 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
1791 replay->overflow, ipsec_logsastr(sav)));
1792 }
1793
1794 replay->count++;
1795
1796 return 0;
1797 }
1798
1799 /*
1800 * shift variable length bunffer to left.
1801 * IN: bitmap: pointer to the buffer
1802 * nbit: the number of to shift.
1803 * wsize: buffer size (bytes).
1804 */
1805 static void
1806 vshiftl(bitmap, nbit, wsize)
1807 unsigned char *bitmap;
1808 int nbit, wsize;
1809 {
1810 int s, j, i;
1811 unsigned char over;
1812
1813 for (j = 0; j < nbit; j += 8) {
1814 s = (nbit - j < 8) ? (nbit - j): 8;
1815 bitmap[0] <<= s;
1816 for (i = 1; i < wsize; i++) {
1817 over = (bitmap[i] >> (8 - s));
1818 bitmap[i] <<= s;
1819 bitmap[i-1] |= over;
1820 }
1821 }
1822
1823 return;
1824 }
1825
1826 /* Return a printable string for the IPv4 address. */
1827 static char *
1828 inet_ntoa4(struct in_addr ina)
1829 {
1830 static char buf[4][4 * sizeof "123" + 4];
1831 unsigned char *ucp = (unsigned char *) &ina;
1832 static int i = 3;
1833
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 switch (sa->sa.sa_family) {
1845 #if INET
1846 case AF_INET:
1847 return inet_ntoa4(sa->sin.sin_addr);
1848 #endif /* INET */
1849
1850 #if INET6
1851 case AF_INET6:
1852 return ip6_sprintf(&sa->sin6.sin6_addr);
1853 #endif /* INET6 */
1854
1855 default:
1856 return "(unknown address family)";
1857 }
1858 }
1859
1860 const char *
1861 ipsec_logsastr(sav)
1862 struct secasvar *sav;
1863 {
1864 static char buf[256];
1865 char *p;
1866 struct secasindex *saidx = &sav->sah->saidx;
1867
1868 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1869 ("ipsec_logsastr: address family mismatch"));
1870
1871 p = buf;
1872 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1873 while (p && *p)
1874 p++;
1875 /* NB: only use ipsec_address on one address at a time */
1876 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1877 ipsec_address(&saidx->src));
1878 while (p && *p)
1879 p++;
1880 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1881 ipsec_address(&saidx->dst));
1882
1883 return buf;
1884 }
1885
1886 void
1887 ipsec_dumpmbuf(m)
1888 struct mbuf *m;
1889 {
1890 int totlen;
1891 int i;
1892 u_char *p;
1893
1894 totlen = 0;
1895 printf("---\n");
1896 while (m) {
1897 p = mtod(m, u_char *);
1898 for (i = 0; i < m->m_len; i++) {
1899 printf("%02x ", p[i]);
1900 totlen++;
1901 if (totlen % 16 == 0)
1902 printf("\n");
1903 }
1904 m = m->m_next;
1905 }
1906 if (totlen % 16 != 0)
1907 printf("\n");
1908 printf("---\n");
1909 }
1910
1911 /* XXX this stuff doesn't belong here... */
1912
1913 static struct xformsw* xforms = NULL;
1914
1915 /*
1916 * Register a transform; typically at system startup.
1917 */
1918 void
1919 xform_register(struct xformsw* xsp)
1920 {
1921 xsp->xf_next = xforms;
1922 xforms = xsp;
1923 }
1924
1925 /*
1926 * Initialize transform support in an sav.
1927 */
1928 int
1929 xform_init(struct secasvar *sav, int xftype)
1930 {
1931 struct xformsw *xsp;
1932
1933 if (sav->tdb_xform != NULL) /* previously initialized */
1934 return 0;
1935 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1936 if (xsp->xf_type == xftype)
1937 return (*xsp->xf_init)(sav, xsp);
1938 return EINVAL;
1939 }
Cache object: dd058c19b7951ecd356c76fd0d8c3379
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