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 #ifdef IPSEC_DEBUG
96 int ipsec_debug = 1;
97 #else
98 int ipsec_debug = 0;
99 #endif
100
101 /* NB: name changed so netstat doesn't use it */
102 struct newipsecstat newipsecstat;
103 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
104 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
105 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
106 int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
107 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
108 int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
109 struct secpolicy ip4_def_policy;
110 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
111 int ip4_esp_randpad = -1;
112 /*
113 * Crypto support requirements:
114 *
115 * 1 require hardware support
116 * -1 require software support
117 * 0 take anything
118 */
119 int crypto_support = 0;
120
121 SYSCTL_DECL(_net_inet_ipsec);
122
123 /* net.inet.ipsec */
124 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
125 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
127 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
129 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
131 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
133 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
135 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
137 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
139 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
141 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
143 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
145 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
146 SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
147 crypto_support, CTLFLAG_RW, &crypto_support,0, "");
148 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
149 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
150
151 #ifdef INET6
152 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
153 int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
154 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
155 int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
156 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
157 int ip6_esp_randpad = -1;
158
159 SYSCTL_DECL(_net_inet6_ipsec6);
160
161 /* net.inet6.ipsec6 */
162 #ifdef COMPAT_KAME
163 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
164 0,0, compat_ipsecstats_sysctl, "S", "");
165 #endif /* COMPAT_KAME */
166 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
167 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
169 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
171 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
173 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
175 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
177 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
179 debug, CTLFLAG_RW, &ipsec_debug, 0, "");
180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
181 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
182 #endif /* INET6 */
183
184 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
185 #ifdef INET6
186 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
187 #endif
188 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
189 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
190 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
191 #ifdef INET6
192 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
193 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
194 #endif
195 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
196 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
197 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
198 int optname, caddr_t request, size_t len, int priv));
199 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
200 static void vshiftl __P((unsigned char *, int, int));
201 static size_t ipsec_hdrsiz __P((struct secpolicy *));
202
203 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
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 key_addref(sp);
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 IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
251 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
252 ("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 IPSEC_ASSERT(sp != NULL, ("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
284 IPSEC_ASSERT(m != NULL, ("null mbuf"));
285 IPSEC_ASSERT(inp != NULL, ("null inpcb"));
286 IPSEC_ASSERT(error != NULL, ("null error"));
287 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
288 ("invalid direction %u", dir));
289
290 /* set spidx in pcb */
291 if (inp->inp_vflag & INP_IPV6PROTO) {
292 #ifdef INET6
293 *error = ipsec6_setspidx_in6pcb(m, inp);
294 pcbsp = inp->in6p_sp;
295 #else
296 *error = EINVAL; /* should not happen */
297 #endif
298 } else {
299 *error = ipsec4_setspidx_inpcb(m, inp);
300 pcbsp = inp->inp_sp;
301 }
302 if (*error)
303 return NULL;
304
305 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
306 switch (dir) {
307 case IPSEC_DIR_INBOUND:
308 currsp = pcbsp->sp_in;
309 break;
310 case IPSEC_DIR_OUTBOUND:
311 currsp = pcbsp->sp_out;
312 break;
313 }
314 IPSEC_ASSERT(currsp != NULL, ("null currsp"));
315
316 if (pcbsp->priv) { /* when privilieged socket */
317 switch (currsp->policy) {
318 case IPSEC_POLICY_BYPASS:
319 case IPSEC_POLICY_IPSEC:
320 key_addref(currsp);
321 sp = currsp;
322 break;
323
324 case IPSEC_POLICY_ENTRUST:
325 /* look for a policy in SPD */
326 sp = KEY_ALLOCSP(&currsp->spidx, dir);
327 if (sp == NULL) /* no SP found */
328 sp = KEY_ALLOCSP_DEFAULT();
329 break;
330
331 default:
332 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
333 __func__, currsp->policy));
334 *error = EINVAL;
335 return NULL;
336 }
337 } else { /* unpriv, SPD has policy */
338 sp = KEY_ALLOCSP(&currsp->spidx, dir);
339 if (sp == NULL) { /* no SP found */
340 switch (currsp->policy) {
341 case IPSEC_POLICY_BYPASS:
342 ipseclog((LOG_ERR, "%s: Illegal policy for "
343 "non-priviliged defined %d\n",
344 __func__, currsp->policy));
345 *error = EINVAL;
346 return NULL;
347
348 case IPSEC_POLICY_ENTRUST:
349 sp = KEY_ALLOCSP_DEFAULT();
350 break;
351
352 case IPSEC_POLICY_IPSEC:
353 key_addref(currsp);
354 sp = currsp;
355 break;
356
357 default:
358 ipseclog((LOG_ERR, "%s: Invalid policy for "
359 "PCB %d\n", __func__, currsp->policy));
360 *error = EINVAL;
361 return NULL;
362 }
363 }
364 }
365 IPSEC_ASSERT(sp != NULL,
366 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
367 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
368 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
369 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
370 return sp;
371 }
372
373 /*
374 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
375 * and return a pointer to SP.
376 * OUT: positive: a pointer to the entry for security policy leaf matched.
377 * NULL: no apropreate SP found, the following value is set to error.
378 * 0 : bypass
379 * EACCES : discard packet.
380 * ENOENT : ipsec_acquire() in progress, maybe.
381 * others : error occured.
382 */
383 struct secpolicy *
384 ipsec_getpolicybyaddr(m, dir, flag, error)
385 struct mbuf *m;
386 u_int dir;
387 int flag;
388 int *error;
389 {
390 struct secpolicyindex spidx;
391 struct secpolicy *sp;
392
393 IPSEC_ASSERT(m != NULL, ("null mbuf"));
394 IPSEC_ASSERT(error != NULL, ("null error"));
395 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
396 ("invalid direction %u", dir));
397
398 sp = NULL;
399 if (key_havesp(dir)) {
400 /* Make an index to look for a policy. */
401 *error = ipsec_setspidx(m, &spidx,
402 (flag & IP_FORWARDING) ? 0 : 1);
403 if (*error != 0) {
404 DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
405 __func__, dir, flag));
406 return NULL;
407 }
408 spidx.dir = dir;
409
410 sp = KEY_ALLOCSP(&spidx, dir);
411 }
412 if (sp == NULL) /* no SP found, use system default */
413 sp = KEY_ALLOCSP_DEFAULT();
414 IPSEC_ASSERT(sp != NULL, ("null SP"));
415 return sp;
416 }
417
418 struct secpolicy *
419 ipsec4_checkpolicy(m, dir, flag, error, inp)
420 struct mbuf *m;
421 u_int dir, flag;
422 int *error;
423 struct inpcb *inp;
424 {
425 struct secpolicy *sp;
426
427 *error = 0;
428 if (inp == NULL)
429 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
430 else
431 sp = ipsec_getpolicybysock(m, dir, inp, error);
432 if (sp == NULL) {
433 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
434 newipsecstat.ips_out_inval++;
435 return NULL;
436 }
437 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
438 switch (sp->policy) {
439 case IPSEC_POLICY_ENTRUST:
440 default:
441 printf("%s: invalid policy %u\n", __func__, sp->policy);
442 /* fall thru... */
443 case IPSEC_POLICY_DISCARD:
444 newipsecstat.ips_out_polvio++;
445 *error = -EINVAL; /* packet is discarded by caller */
446 break;
447 case IPSEC_POLICY_BYPASS:
448 case IPSEC_POLICY_NONE:
449 KEY_FREESP(&sp);
450 sp = NULL; /* NB: force NULL result */
451 break;
452 case IPSEC_POLICY_IPSEC:
453 if (sp->req == NULL) /* acquire an SA */
454 *error = key_spdacquire(sp);
455 break;
456 }
457 if (*error != 0) {
458 KEY_FREESP(&sp);
459 sp = NULL;
460 }
461 return sp;
462 }
463
464 static int
465 ipsec4_setspidx_inpcb(m, pcb)
466 struct mbuf *m;
467 struct inpcb *pcb;
468 {
469 int error;
470
471 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
472 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
473 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
474 ("null sp_in || sp_out"));
475
476 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
477 if (error == 0) {
478 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
479 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
480 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
481 } else {
482 bzero(&pcb->inp_sp->sp_in->spidx,
483 sizeof (pcb->inp_sp->sp_in->spidx));
484 bzero(&pcb->inp_sp->sp_out->spidx,
485 sizeof (pcb->inp_sp->sp_in->spidx));
486 }
487 return error;
488 }
489
490 #ifdef INET6
491 static int
492 ipsec6_setspidx_in6pcb(m, pcb)
493 struct mbuf *m;
494 struct in6pcb *pcb;
495 {
496 struct secpolicyindex *spidx;
497 int error;
498
499 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
500 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
501 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
502 ("null sp_in || sp_out"));
503
504 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
505 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
506
507 spidx = &pcb->in6p_sp->sp_in->spidx;
508 error = ipsec_setspidx(m, spidx, 1);
509 if (error)
510 goto bad;
511 spidx->dir = IPSEC_DIR_INBOUND;
512
513 spidx = &pcb->in6p_sp->sp_out->spidx;
514 error = ipsec_setspidx(m, spidx, 1);
515 if (error)
516 goto bad;
517 spidx->dir = IPSEC_DIR_OUTBOUND;
518
519 return 0;
520
521 bad:
522 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
523 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
524 return error;
525 }
526 #endif
527
528 /*
529 * configure security policy index (src/dst/proto/sport/dport)
530 * by looking at the content of mbuf.
531 * the caller is responsible for error recovery (like clearing up spidx).
532 */
533 static int
534 ipsec_setspidx(m, spidx, needport)
535 struct mbuf *m;
536 struct secpolicyindex *spidx;
537 int needport;
538 {
539 struct ip *ip = NULL;
540 struct ip ipbuf;
541 u_int v;
542 struct mbuf *n;
543 int len;
544 int error;
545
546 IPSEC_ASSERT(m != NULL, ("null mbuf"));
547
548 /*
549 * validate m->m_pkthdr.len. we see incorrect length if we
550 * mistakenly call this function with inconsistent mbuf chain
551 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
552 */
553 len = 0;
554 for (n = m; n; n = n->m_next)
555 len += n->m_len;
556 if (m->m_pkthdr.len != len) {
557 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
558 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
559 __func__, len, m->m_pkthdr.len));
560 return EINVAL;
561 }
562
563 if (m->m_pkthdr.len < sizeof(struct ip)) {
564 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
565 printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
566 __func__, m->m_pkthdr.len));
567 return EINVAL;
568 }
569
570 if (m->m_len >= sizeof(*ip))
571 ip = mtod(m, struct ip *);
572 else {
573 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
574 ip = &ipbuf;
575 }
576 #ifdef _IP_VHL
577 v = _IP_VHL_V(ip->ip_vhl);
578 #else
579 v = ip->ip_v;
580 #endif
581 switch (v) {
582 case 4:
583 error = ipsec4_setspidx_ipaddr(m, spidx);
584 if (error)
585 return error;
586 ipsec4_get_ulp(m, spidx, needport);
587 return 0;
588 #ifdef INET6
589 case 6:
590 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
591 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
592 printf("%s: pkthdr len(%d) too small (v6), "
593 "ignored\n", __func__, m->m_pkthdr.len));
594 return EINVAL;
595 }
596 error = ipsec6_setspidx_ipaddr(m, spidx);
597 if (error)
598 return error;
599 ipsec6_get_ulp(m, spidx, needport);
600 return 0;
601 #endif
602 default:
603 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
604 printf("%s: " "unknown IP version %u, ignored.\n",
605 __func__, v));
606 return EINVAL;
607 }
608 }
609
610 static void
611 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
612 {
613 u_int8_t nxt;
614 int off;
615
616 /* sanity check */
617 IPSEC_ASSERT(m != NULL, ("null mbuf"));
618 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
619
620 /* NB: ip_input() flips it into host endian XXX need more checking */
621 if (m->m_len < sizeof (struct ip)) {
622 struct ip *ip = mtod(m, struct ip *);
623 if (ip->ip_off & (IP_MF | IP_OFFMASK))
624 goto done;
625 #ifdef _IP_VHL
626 off = _IP_VHL_HL(ip->ip_vhl) << 2;
627 #else
628 off = ip->ip_hl << 2;
629 #endif
630 nxt = ip->ip_p;
631 } else {
632 struct ip ih;
633
634 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
635 if (ih.ip_off & (IP_MF | IP_OFFMASK))
636 goto done;
637 #ifdef _IP_VHL
638 off = _IP_VHL_HL(ih.ip_vhl) << 2;
639 #else
640 off = ih.ip_hl << 2;
641 #endif
642 nxt = ih.ip_p;
643 }
644
645 while (off < m->m_pkthdr.len) {
646 struct ip6_ext ip6e;
647 struct tcphdr th;
648 struct udphdr uh;
649
650 switch (nxt) {
651 case IPPROTO_TCP:
652 spidx->ul_proto = nxt;
653 if (!needport)
654 goto done_proto;
655 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
656 goto done;
657 m_copydata(m, off, sizeof (th), (caddr_t) &th);
658 spidx->src.sin.sin_port = th.th_sport;
659 spidx->dst.sin.sin_port = th.th_dport;
660 return;
661 case IPPROTO_UDP:
662 spidx->ul_proto = nxt;
663 if (!needport)
664 goto done_proto;
665 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
666 goto done;
667 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
668 spidx->src.sin.sin_port = uh.uh_sport;
669 spidx->dst.sin.sin_port = uh.uh_dport;
670 return;
671 case IPPROTO_AH:
672 if (off + sizeof(ip6e) > m->m_pkthdr.len)
673 goto done;
674 /* XXX sigh, this works but is totally bogus */
675 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
676 off += (ip6e.ip6e_len + 2) << 2;
677 nxt = ip6e.ip6e_nxt;
678 break;
679 case IPPROTO_ICMP:
680 default:
681 /* XXX intermediate headers??? */
682 spidx->ul_proto = nxt;
683 goto done_proto;
684 }
685 }
686 done:
687 spidx->ul_proto = IPSEC_ULPROTO_ANY;
688 done_proto:
689 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
690 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
691 }
692
693 /* assumes that m is sane */
694 static int
695 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
696 {
697 static const struct sockaddr_in template = {
698 sizeof (struct sockaddr_in),
699 AF_INET,
700 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
701 };
702
703 spidx->src.sin = template;
704 spidx->dst.sin = template;
705
706 if (m->m_len < sizeof (struct ip)) {
707 m_copydata(m, offsetof(struct ip, ip_src),
708 sizeof (struct in_addr),
709 (caddr_t) &spidx->src.sin.sin_addr);
710 m_copydata(m, offsetof(struct ip, ip_dst),
711 sizeof (struct in_addr),
712 (caddr_t) &spidx->dst.sin.sin_addr);
713 } else {
714 struct ip *ip = mtod(m, struct ip *);
715 spidx->src.sin.sin_addr = ip->ip_src;
716 spidx->dst.sin.sin_addr = ip->ip_dst;
717 }
718
719 spidx->prefs = sizeof(struct in_addr) << 3;
720 spidx->prefd = sizeof(struct in_addr) << 3;
721
722 return 0;
723 }
724
725 #ifdef INET6
726 static void
727 ipsec6_get_ulp(m, spidx, needport)
728 struct mbuf *m;
729 struct secpolicyindex *spidx;
730 int needport;
731 {
732 int off, nxt;
733 struct tcphdr th;
734 struct udphdr uh;
735 struct icmp6_hdr ih;
736
737 /* sanity check */
738 if (m == NULL)
739 panic("%s: NULL pointer was passed.\n", __func__);
740
741 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
742 printf("%s:\n", __func__); kdebug_mbuf(m));
743
744 /* set default */
745 spidx->ul_proto = IPSEC_ULPROTO_ANY;
746 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
747 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
748
749 nxt = -1;
750 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
751 if (off < 0 || m->m_pkthdr.len < off)
752 return;
753
754 switch (nxt) {
755 case IPPROTO_TCP:
756 spidx->ul_proto = nxt;
757 if (!needport)
758 break;
759 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
760 break;
761 m_copydata(m, off, sizeof(th), (caddr_t)&th);
762 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
763 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
764 break;
765 case IPPROTO_UDP:
766 spidx->ul_proto = nxt;
767 if (!needport)
768 break;
769 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
770 break;
771 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
772 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
773 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
774 break;
775 case IPPROTO_ICMPV6:
776 spidx->ul_proto = nxt;
777 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
778 break;
779 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
780 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
781 htons((uint16_t)ih.icmp6_type);
782 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
783 htons((uint16_t)ih.icmp6_code);
784 break;
785 default:
786 /* XXX intermediate headers??? */
787 spidx->ul_proto = nxt;
788 break;
789 }
790 }
791
792 /* assumes that m is sane */
793 static int
794 ipsec6_setspidx_ipaddr(m, spidx)
795 struct mbuf *m;
796 struct secpolicyindex *spidx;
797 {
798 struct ip6_hdr *ip6 = NULL;
799 struct ip6_hdr ip6buf;
800 struct sockaddr_in6 *sin6;
801
802 if (m->m_len >= sizeof(*ip6))
803 ip6 = mtod(m, struct ip6_hdr *);
804 else {
805 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
806 ip6 = &ip6buf;
807 }
808
809 sin6 = (struct sockaddr_in6 *)&spidx->src;
810 bzero(sin6, sizeof(*sin6));
811 sin6->sin6_family = AF_INET6;
812 sin6->sin6_len = sizeof(struct sockaddr_in6);
813 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
814 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
815 sin6->sin6_addr.s6_addr16[1] = 0;
816 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
817 }
818 spidx->prefs = sizeof(struct in6_addr) << 3;
819
820 sin6 = (struct sockaddr_in6 *)&spidx->dst;
821 bzero(sin6, sizeof(*sin6));
822 sin6->sin6_family = AF_INET6;
823 sin6->sin6_len = sizeof(struct sockaddr_in6);
824 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
825 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
826 sin6->sin6_addr.s6_addr16[1] = 0;
827 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
828 }
829 spidx->prefd = sizeof(struct in6_addr) << 3;
830
831 return 0;
832 }
833 #endif
834
835 static void
836 ipsec_delpcbpolicy(p)
837 struct inpcbpolicy *p;
838 {
839 free(p, M_IPSEC_INPCB);
840 }
841
842 /* initialize policy in PCB */
843 int
844 ipsec_init_policy(so, pcb_sp)
845 struct socket *so;
846 struct inpcbpolicy **pcb_sp;
847 {
848 struct inpcbpolicy *new;
849
850 /* sanity check. */
851 if (so == NULL || pcb_sp == NULL)
852 panic("%s: NULL pointer was passed.\n", __func__);
853
854 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
855 M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
856 if (new == NULL) {
857 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
858 return ENOBUFS;
859 }
860
861 new->priv = IPSEC_IS_PRIVILEGED_SO(so);
862
863 if ((new->sp_in = KEY_NEWSP()) == NULL) {
864 ipsec_delpcbpolicy(new);
865 return ENOBUFS;
866 }
867 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
868 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
869
870 if ((new->sp_out = KEY_NEWSP()) == NULL) {
871 KEY_FREESP(&new->sp_in);
872 ipsec_delpcbpolicy(new);
873 return ENOBUFS;
874 }
875 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
876 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
877
878 *pcb_sp = new;
879
880 return 0;
881 }
882
883 /* copy old ipsec policy into new */
884 int
885 ipsec_copy_policy(old, new)
886 struct inpcbpolicy *old, *new;
887 {
888 struct secpolicy *sp;
889
890 sp = ipsec_deepcopy_policy(old->sp_in);
891 if (sp) {
892 KEY_FREESP(&new->sp_in);
893 new->sp_in = sp;
894 } else
895 return ENOBUFS;
896
897 sp = ipsec_deepcopy_policy(old->sp_out);
898 if (sp) {
899 KEY_FREESP(&new->sp_out);
900 new->sp_out = sp;
901 } else
902 return ENOBUFS;
903
904 new->priv = old->priv;
905
906 return 0;
907 }
908
909 struct ipsecrequest *
910 ipsec_newisr(void)
911 {
912 struct ipsecrequest *p;
913
914 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
915 if (p != NULL)
916 IPSECREQUEST_LOCK_INIT(p);
917 return p;
918 }
919
920 void
921 ipsec_delisr(struct ipsecrequest *p)
922 {
923 IPSECREQUEST_LOCK_DESTROY(p);
924 free(p, M_IPSEC_SR);
925 }
926
927 /* deep-copy a policy in PCB */
928 static struct secpolicy *
929 ipsec_deepcopy_policy(src)
930 struct secpolicy *src;
931 {
932 struct ipsecrequest *newchain = NULL;
933 struct ipsecrequest *p;
934 struct ipsecrequest **q;
935 struct ipsecrequest *r;
936 struct secpolicy *dst;
937
938 if (src == NULL)
939 return NULL;
940 dst = KEY_NEWSP();
941 if (dst == NULL)
942 return NULL;
943
944 /*
945 * deep-copy IPsec request chain. This is required since struct
946 * ipsecrequest is not reference counted.
947 */
948 q = &newchain;
949 for (p = src->req; p; p = p->next) {
950 *q = ipsec_newisr();
951 if (*q == NULL)
952 goto fail;
953 (*q)->saidx.proto = p->saidx.proto;
954 (*q)->saidx.mode = p->saidx.mode;
955 (*q)->level = p->level;
956 (*q)->saidx.reqid = p->saidx.reqid;
957
958 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
959 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
960
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 ipsec_delisr(p);
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("%s: passed policy\n", __func__);
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("%s: new policy\n", __func__);
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, "%s: No more memory.\n", __func__));
1045 return ENOBUFS;
1046 }
1047
1048 (*mp)->m_type = MT_DATA;
1049 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1050 printf("%s:\n", __func__); kdebug_mbuf(*mp));
1051
1052 return 0;
1053 }
1054
1055 int
1056 ipsec4_set_policy(inp, optname, request, len, priv)
1057 struct inpcb *inp;
1058 int optname;
1059 caddr_t request;
1060 size_t len;
1061 int priv;
1062 {
1063 struct sadb_x_policy *xpl;
1064 struct secpolicy **pcb_sp;
1065
1066 /* sanity check. */
1067 if (inp == NULL || request == NULL)
1068 return EINVAL;
1069 if (len < sizeof(*xpl))
1070 return EINVAL;
1071 xpl = (struct sadb_x_policy *)request;
1072
1073 /* select direction */
1074 switch (xpl->sadb_x_policy_dir) {
1075 case IPSEC_DIR_INBOUND:
1076 pcb_sp = &inp->inp_sp->sp_in;
1077 break;
1078 case IPSEC_DIR_OUTBOUND:
1079 pcb_sp = &inp->inp_sp->sp_out;
1080 break;
1081 default:
1082 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1083 xpl->sadb_x_policy_dir));
1084 return EINVAL;
1085 }
1086
1087 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1088 }
1089
1090 int
1091 ipsec4_get_policy(inp, request, len, mp)
1092 struct inpcb *inp;
1093 caddr_t request;
1094 size_t len;
1095 struct mbuf **mp;
1096 {
1097 struct sadb_x_policy *xpl;
1098 struct secpolicy *pcb_sp;
1099
1100 /* sanity check. */
1101 if (inp == NULL || request == NULL || mp == NULL)
1102 return EINVAL;
1103 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp"));
1104 if (len < sizeof(*xpl))
1105 return EINVAL;
1106 xpl = (struct sadb_x_policy *)request;
1107
1108 /* select direction */
1109 switch (xpl->sadb_x_policy_dir) {
1110 case IPSEC_DIR_INBOUND:
1111 pcb_sp = inp->inp_sp->sp_in;
1112 break;
1113 case IPSEC_DIR_OUTBOUND:
1114 pcb_sp = inp->inp_sp->sp_out;
1115 break;
1116 default:
1117 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1118 xpl->sadb_x_policy_dir));
1119 return EINVAL;
1120 }
1121
1122 return ipsec_get_policy(pcb_sp, mp);
1123 }
1124
1125 /* delete policy in PCB */
1126 int
1127 ipsec4_delete_pcbpolicy(inp)
1128 struct inpcb *inp;
1129 {
1130 IPSEC_ASSERT(inp != NULL, ("null inp"));
1131
1132 if (inp->inp_sp == NULL)
1133 return 0;
1134
1135 if (inp->inp_sp->sp_in != NULL)
1136 KEY_FREESP(&inp->inp_sp->sp_in);
1137
1138 if (inp->inp_sp->sp_out != NULL)
1139 KEY_FREESP(&inp->inp_sp->sp_out);
1140
1141 ipsec_delpcbpolicy(inp->inp_sp);
1142 inp->inp_sp = NULL;
1143
1144 return 0;
1145 }
1146
1147 #ifdef INET6
1148 int
1149 ipsec6_set_policy(in6p, optname, request, len, priv)
1150 struct in6pcb *in6p;
1151 int optname;
1152 caddr_t request;
1153 size_t len;
1154 int priv;
1155 {
1156 struct sadb_x_policy *xpl;
1157 struct secpolicy **pcb_sp;
1158
1159 /* sanity check. */
1160 if (in6p == NULL || request == NULL)
1161 return EINVAL;
1162 if (len < sizeof(*xpl))
1163 return EINVAL;
1164 xpl = (struct sadb_x_policy *)request;
1165
1166 /* select direction */
1167 switch (xpl->sadb_x_policy_dir) {
1168 case IPSEC_DIR_INBOUND:
1169 pcb_sp = &in6p->in6p_sp->sp_in;
1170 break;
1171 case IPSEC_DIR_OUTBOUND:
1172 pcb_sp = &in6p->in6p_sp->sp_out;
1173 break;
1174 default:
1175 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1176 xpl->sadb_x_policy_dir));
1177 return EINVAL;
1178 }
1179
1180 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1181 }
1182
1183 int
1184 ipsec6_get_policy(in6p, request, len, mp)
1185 struct in6pcb *in6p;
1186 caddr_t request;
1187 size_t len;
1188 struct mbuf **mp;
1189 {
1190 struct sadb_x_policy *xpl;
1191 struct secpolicy *pcb_sp;
1192
1193 /* sanity check. */
1194 if (in6p == NULL || request == NULL || mp == NULL)
1195 return EINVAL;
1196 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp"));
1197 if (len < sizeof(*xpl))
1198 return EINVAL;
1199 xpl = (struct sadb_x_policy *)request;
1200
1201 /* select direction */
1202 switch (xpl->sadb_x_policy_dir) {
1203 case IPSEC_DIR_INBOUND:
1204 pcb_sp = in6p->in6p_sp->sp_in;
1205 break;
1206 case IPSEC_DIR_OUTBOUND:
1207 pcb_sp = in6p->in6p_sp->sp_out;
1208 break;
1209 default:
1210 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
1211 xpl->sadb_x_policy_dir));
1212 return EINVAL;
1213 }
1214
1215 return ipsec_get_policy(pcb_sp, mp);
1216 }
1217
1218 int
1219 ipsec6_delete_pcbpolicy(in6p)
1220 struct in6pcb *in6p;
1221 {
1222 IPSEC_ASSERT(in6p != NULL, ("null in6p"));
1223
1224 if (in6p->in6p_sp == NULL)
1225 return 0;
1226
1227 if (in6p->in6p_sp->sp_in != NULL)
1228 KEY_FREESP(&in6p->in6p_sp->sp_in);
1229
1230 if (in6p->in6p_sp->sp_out != NULL)
1231 KEY_FREESP(&in6p->in6p_sp->sp_out);
1232
1233 ipsec_delpcbpolicy(in6p->in6p_sp);
1234 in6p->in6p_sp = NULL;
1235
1236 return 0;
1237 }
1238 #endif
1239
1240 /*
1241 * return current level.
1242 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1243 */
1244 u_int
1245 ipsec_get_reqlevel(isr)
1246 struct ipsecrequest *isr;
1247 {
1248 u_int level = 0;
1249 u_int esp_trans_deflev, esp_net_deflev;
1250 u_int ah_trans_deflev, ah_net_deflev;
1251
1252 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1253 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1254 ("af family mismatch, src %u, dst %u",
1255 isr->sp->spidx.src.sa.sa_family,
1256 isr->sp->spidx.dst.sa.sa_family));
1257
1258 /* XXX note that we have ipseclog() expanded here - code sync issue */
1259 #define IPSEC_CHECK_DEFAULT(lev) \
1260 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1261 && (lev) != IPSEC_LEVEL_UNIQUE) \
1262 ? (ipsec_debug \
1263 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1264 (lev), IPSEC_LEVEL_REQUIRE) \
1265 : 0), \
1266 (lev) = IPSEC_LEVEL_REQUIRE, \
1267 (lev) \
1268 : (lev))
1269
1270 /* set default level */
1271 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1272 #ifdef INET
1273 case AF_INET:
1274 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1275 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1276 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1277 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1278 break;
1279 #endif
1280 #ifdef INET6
1281 case AF_INET6:
1282 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1283 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1284 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1285 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1286 break;
1287 #endif /* INET6 */
1288 default:
1289 panic("%s: unknown af %u",
1290 __func__, isr->sp->spidx.src.sa.sa_family);
1291 }
1292
1293 #undef IPSEC_CHECK_DEFAULT
1294
1295 /* set level */
1296 switch (isr->level) {
1297 case IPSEC_LEVEL_DEFAULT:
1298 switch (isr->saidx.proto) {
1299 case IPPROTO_ESP:
1300 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1301 level = esp_net_deflev;
1302 else
1303 level = esp_trans_deflev;
1304 break;
1305 case IPPROTO_AH:
1306 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1307 level = ah_net_deflev;
1308 else
1309 level = ah_trans_deflev;
1310 break;
1311 case IPPROTO_IPCOMP:
1312 /*
1313 * we don't really care, as IPcomp document says that
1314 * we shouldn't compress small packets
1315 */
1316 level = IPSEC_LEVEL_USE;
1317 break;
1318 default:
1319 panic("%s: Illegal protocol defined %u\n", __func__,
1320 isr->saidx.proto);
1321 }
1322 break;
1323
1324 case IPSEC_LEVEL_USE:
1325 case IPSEC_LEVEL_REQUIRE:
1326 level = isr->level;
1327 break;
1328 case IPSEC_LEVEL_UNIQUE:
1329 level = IPSEC_LEVEL_REQUIRE;
1330 break;
1331
1332 default:
1333 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1334 }
1335
1336 return level;
1337 }
1338
1339 /*
1340 * Check security policy requirements against the actual
1341 * packet contents. Return one if the packet should be
1342 * reject as "invalid"; otherwiser return zero to have the
1343 * packet treated as "valid".
1344 *
1345 * OUT:
1346 * 0: valid
1347 * 1: invalid
1348 */
1349 int
1350 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1351 {
1352 struct ipsecrequest *isr;
1353 int need_auth;
1354
1355 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1356 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1357
1358 /* check policy */
1359 switch (sp->policy) {
1360 case IPSEC_POLICY_DISCARD:
1361 return 1;
1362 case IPSEC_POLICY_BYPASS:
1363 case IPSEC_POLICY_NONE:
1364 return 0;
1365 }
1366
1367 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1368 ("invalid policy %u", sp->policy));
1369
1370 /* XXX should compare policy against ipsec header history */
1371
1372 need_auth = 0;
1373 for (isr = sp->req; isr != NULL; isr = isr->next) {
1374 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1375 continue;
1376 switch (isr->saidx.proto) {
1377 case IPPROTO_ESP:
1378 if ((m->m_flags & M_DECRYPTED) == 0) {
1379 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1380 printf("%s: ESP m_flags:%x\n", __func__,
1381 m->m_flags));
1382 return 1;
1383 }
1384
1385 if (!need_auth &&
1386 isr->sav != NULL &&
1387 isr->sav->tdb_authalgxform != NULL &&
1388 (m->m_flags & M_AUTHIPDGM) == 0) {
1389 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1390 printf("%s: ESP/AH m_flags:%x\n", __func__,
1391 m->m_flags));
1392 return 1;
1393 }
1394 break;
1395 case IPPROTO_AH:
1396 need_auth = 1;
1397 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1398 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1399 printf("%s: AH m_flags:%x\n", __func__,
1400 m->m_flags));
1401 return 1;
1402 }
1403 break;
1404 case IPPROTO_IPCOMP:
1405 /*
1406 * we don't really care, as IPcomp document
1407 * says that we shouldn't compress small
1408 * packets, IPComp policy should always be
1409 * treated as being in "use" level.
1410 */
1411 break;
1412 }
1413 }
1414 return 0; /* valid */
1415 }
1416
1417 /*
1418 * Check AH/ESP integrity.
1419 * This function is called from tcp_input(), udp_input(),
1420 * and {ah,esp}4_input for tunnel mode
1421 */
1422 int
1423 ipsec4_in_reject(m, inp)
1424 struct mbuf *m;
1425 struct inpcb *inp;
1426 {
1427 struct secpolicy *sp;
1428 int error;
1429 int result;
1430
1431 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1432
1433 /* get SP for this packet.
1434 * When we are called from ip_forward(), we call
1435 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1436 */
1437 if (inp == NULL)
1438 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1439 else
1440 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1441
1442 if (sp != NULL) {
1443 result = ipsec_in_reject(sp, m);
1444 if (result)
1445 newipsecstat.ips_in_polvio++;
1446 KEY_FREESP(&sp);
1447 } else {
1448 result = 0; /* XXX should be panic ?
1449 * -> No, there may be error. */
1450 }
1451 return result;
1452 }
1453
1454 #ifdef INET6
1455 /*
1456 * Check AH/ESP integrity.
1457 * This function is called from tcp6_input(), udp6_input(),
1458 * and {ah,esp}6_input for tunnel mode
1459 */
1460 int
1461 ipsec6_in_reject(m, inp)
1462 struct mbuf *m;
1463 struct inpcb *inp;
1464 {
1465 struct secpolicy *sp = NULL;
1466 int error;
1467 int result;
1468
1469 /* sanity check */
1470 if (m == NULL)
1471 return 0; /* XXX should be panic ? */
1472
1473 /* get SP for this packet.
1474 * When we are called from ip_forward(), we call
1475 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1476 */
1477 if (inp == NULL)
1478 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1479 else
1480 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1481
1482 if (sp != NULL) {
1483 result = ipsec_in_reject(sp, m);
1484 if (result)
1485 newipsecstat.ips_in_polvio++;
1486 KEY_FREESP(&sp);
1487 } else {
1488 result = 0;
1489 }
1490 return result;
1491 }
1492 #endif
1493
1494 /*
1495 * compute the byte size to be occupied by IPsec header.
1496 * in case it is tunneled, it includes the size of outer IP header.
1497 * NOTE: SP passed is free in this function.
1498 */
1499 static size_t
1500 ipsec_hdrsiz(struct secpolicy *sp)
1501 {
1502 struct ipsecrequest *isr;
1503 size_t siz;
1504
1505 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1506 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1507
1508 switch (sp->policy) {
1509 case IPSEC_POLICY_DISCARD:
1510 case IPSEC_POLICY_BYPASS:
1511 case IPSEC_POLICY_NONE:
1512 return 0;
1513 }
1514
1515 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1516 ("invalid policy %u", sp->policy));
1517
1518 siz = 0;
1519 for (isr = sp->req; isr != NULL; isr = isr->next) {
1520 size_t clen = 0;
1521
1522 switch (isr->saidx.proto) {
1523 case IPPROTO_ESP:
1524 clen = esp_hdrsiz(isr->sav);
1525 break;
1526 case IPPROTO_AH:
1527 clen = ah_hdrsiz(isr->sav);
1528 break;
1529 case IPPROTO_IPCOMP:
1530 clen = sizeof(struct ipcomp);
1531 break;
1532 }
1533
1534 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1535 switch (isr->saidx.dst.sa.sa_family) {
1536 case AF_INET:
1537 clen += sizeof(struct ip);
1538 break;
1539 #ifdef INET6
1540 case AF_INET6:
1541 clen += sizeof(struct ip6_hdr);
1542 break;
1543 #endif
1544 default:
1545 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1546 "IPsec tunnel SA\n", __func__,
1547 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1548 break;
1549 }
1550 }
1551 siz += clen;
1552 }
1553
1554 return siz;
1555 }
1556
1557 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1558 size_t
1559 ipsec4_hdrsiz(m, dir, inp)
1560 struct mbuf *m;
1561 u_int dir;
1562 struct inpcb *inp;
1563 {
1564 struct secpolicy *sp;
1565 int error;
1566 size_t size;
1567
1568 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1569
1570 /* get SP for this packet.
1571 * When we are called from ip_forward(), we call
1572 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1573 */
1574 if (inp == NULL)
1575 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1576 else
1577 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1578
1579 if (sp != NULL) {
1580 size = ipsec_hdrsiz(sp);
1581 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1582 printf("%s: size:%lu.\n", __func__,
1583 (unsigned long)size));
1584
1585 KEY_FREESP(&sp);
1586 } else {
1587 size = 0; /* XXX should be panic ? */
1588 }
1589 return size;
1590 }
1591
1592 #ifdef INET6
1593 /* This function is called from ipsec6_hdrsize_tcp(),
1594 * and maybe from ip6_forward.()
1595 */
1596 size_t
1597 ipsec6_hdrsiz(m, dir, in6p)
1598 struct mbuf *m;
1599 u_int dir;
1600 struct in6pcb *in6p;
1601 {
1602 struct secpolicy *sp;
1603 int error;
1604 size_t size;
1605
1606 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1607 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1608 ("socket w/o inpcb"));
1609
1610 /* get SP for this packet */
1611 /* XXX Is it right to call with IP_FORWARDING. */
1612 if (in6p == NULL)
1613 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1614 else
1615 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1616
1617 if (sp == NULL)
1618 return 0;
1619 size = ipsec_hdrsiz(sp);
1620 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1621 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1622 KEY_FREESP(&sp);
1623
1624 return size;
1625 }
1626 #endif /*INET6*/
1627
1628 /*
1629 * Check the variable replay window.
1630 * ipsec_chkreplay() performs replay check before ICV verification.
1631 * ipsec_updatereplay() updates replay bitmap. This must be called after
1632 * ICV verification (it also performs replay check, which is usually done
1633 * beforehand).
1634 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1635 *
1636 * based on RFC 2401.
1637 */
1638 int
1639 ipsec_chkreplay(seq, sav)
1640 u_int32_t seq;
1641 struct secasvar *sav;
1642 {
1643 const struct secreplay *replay;
1644 u_int32_t diff;
1645 int fr;
1646 u_int32_t wsizeb; /* constant: bits of window size */
1647 int frlast; /* constant: last frame */
1648
1649 IPSEC_SPLASSERT_SOFTNET(__func__);
1650
1651 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1652 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1653
1654 replay = sav->replay;
1655
1656 if (replay->wsize == 0)
1657 return 1; /* no need to check replay. */
1658
1659 /* constant */
1660 frlast = replay->wsize - 1;
1661 wsizeb = replay->wsize << 3;
1662
1663 /* sequence number of 0 is invalid */
1664 if (seq == 0)
1665 return 0;
1666
1667 /* first time is always okay */
1668 if (replay->count == 0)
1669 return 1;
1670
1671 if (seq > replay->lastseq) {
1672 /* larger sequences are okay */
1673 return 1;
1674 } else {
1675 /* seq is equal or less than lastseq. */
1676 diff = replay->lastseq - seq;
1677
1678 /* over range to check, i.e. too old or wrapped */
1679 if (diff >= wsizeb)
1680 return 0;
1681
1682 fr = frlast - diff / 8;
1683
1684 /* this packet already seen ? */
1685 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1686 return 0;
1687
1688 /* out of order but good */
1689 return 1;
1690 }
1691 }
1692
1693 /*
1694 * check replay counter whether to update or not.
1695 * OUT: 0: OK
1696 * 1: NG
1697 */
1698 int
1699 ipsec_updatereplay(seq, sav)
1700 u_int32_t seq;
1701 struct secasvar *sav;
1702 {
1703 struct secreplay *replay;
1704 u_int32_t diff;
1705 int fr;
1706 u_int32_t wsizeb; /* constant: bits of window size */
1707 int frlast; /* constant: last frame */
1708
1709 IPSEC_SPLASSERT_SOFTNET(__func__);
1710
1711 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1712 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1713
1714 replay = sav->replay;
1715
1716 if (replay->wsize == 0)
1717 goto ok; /* no need to check replay. */
1718
1719 /* constant */
1720 frlast = replay->wsize - 1;
1721 wsizeb = replay->wsize << 3;
1722
1723 /* sequence number of 0 is invalid */
1724 if (seq == 0)
1725 return 1;
1726
1727 /* first time */
1728 if (replay->count == 0) {
1729 replay->lastseq = seq;
1730 bzero(replay->bitmap, replay->wsize);
1731 (replay->bitmap)[frlast] = 1;
1732 goto ok;
1733 }
1734
1735 if (seq > replay->lastseq) {
1736 /* seq is larger than lastseq. */
1737 diff = seq - replay->lastseq;
1738
1739 /* new larger sequence number */
1740 if (diff < wsizeb) {
1741 /* In window */
1742 /* set bit for this packet */
1743 vshiftl(replay->bitmap, diff, replay->wsize);
1744 (replay->bitmap)[frlast] |= 1;
1745 } else {
1746 /* this packet has a "way larger" */
1747 bzero(replay->bitmap, replay->wsize);
1748 (replay->bitmap)[frlast] = 1;
1749 }
1750 replay->lastseq = seq;
1751
1752 /* larger is good */
1753 } else {
1754 /* seq is equal or less than lastseq. */
1755 diff = replay->lastseq - seq;
1756
1757 /* over range to check, i.e. too old or wrapped */
1758 if (diff >= wsizeb)
1759 return 1;
1760
1761 fr = frlast - diff / 8;
1762
1763 /* this packet already seen ? */
1764 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1765 return 1;
1766
1767 /* mark as seen */
1768 (replay->bitmap)[fr] |= (1 << (diff % 8));
1769
1770 /* out of order but good */
1771 }
1772
1773 ok:
1774 if (replay->count == ~0) {
1775
1776 /* set overflow flag */
1777 replay->overflow++;
1778
1779 /* don't increment, no more packets accepted */
1780 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1781 return 1;
1782
1783 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1784 __func__, replay->overflow, ipsec_logsastr(sav)));
1785 }
1786
1787 replay->count++;
1788
1789 return 0;
1790 }
1791
1792 /*
1793 * shift variable length buffer to left.
1794 * IN: bitmap: pointer to the buffer
1795 * nbit: the number of to shift.
1796 * wsize: buffer size (bytes).
1797 */
1798 static void
1799 vshiftl(bitmap, nbit, wsize)
1800 unsigned char *bitmap;
1801 int nbit, wsize;
1802 {
1803 int s, j, i;
1804 unsigned char over;
1805
1806 for (j = 0; j < nbit; j += 8) {
1807 s = (nbit - j < 8) ? (nbit - j): 8;
1808 bitmap[0] <<= s;
1809 for (i = 1; i < wsize; i++) {
1810 over = (bitmap[i] >> (8 - s));
1811 bitmap[i] <<= s;
1812 bitmap[i-1] |= over;
1813 }
1814 }
1815
1816 return;
1817 }
1818
1819 /* Return a printable string for the IPv4 address. */
1820 static char *
1821 inet_ntoa4(struct in_addr ina)
1822 {
1823 static char buf[4][4 * sizeof "123" + 4];
1824 unsigned char *ucp = (unsigned char *) &ina;
1825 static int i = 3;
1826
1827 i = (i + 1) % 4;
1828 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1829 ucp[2] & 0xff, ucp[3] & 0xff);
1830 return (buf[i]);
1831 }
1832
1833 /* Return a printable string for the address. */
1834 char *
1835 ipsec_address(union sockaddr_union* sa)
1836 {
1837 switch (sa->sa.sa_family) {
1838 #ifdef INET
1839 case AF_INET:
1840 return inet_ntoa4(sa->sin.sin_addr);
1841 #endif /* INET */
1842
1843 #ifdef INET6
1844 case AF_INET6:
1845 return ip6_sprintf(&sa->sin6.sin6_addr);
1846 #endif /* INET6 */
1847
1848 default:
1849 return "(unknown address family)";
1850 }
1851 }
1852
1853 const char *
1854 ipsec_logsastr(sav)
1855 struct secasvar *sav;
1856 {
1857 static char buf[256];
1858 char *p;
1859 struct secasindex *saidx = &sav->sah->saidx;
1860
1861 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1862 ("address family mismatch"));
1863
1864 p = buf;
1865 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1866 while (p && *p)
1867 p++;
1868 /* NB: only use ipsec_address on one address at a time */
1869 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1870 ipsec_address(&saidx->src));
1871 while (p && *p)
1872 p++;
1873 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1874 ipsec_address(&saidx->dst));
1875
1876 return buf;
1877 }
1878
1879 void
1880 ipsec_dumpmbuf(m)
1881 struct mbuf *m;
1882 {
1883 int totlen;
1884 int i;
1885 u_char *p;
1886
1887 totlen = 0;
1888 printf("---\n");
1889 while (m) {
1890 p = mtod(m, u_char *);
1891 for (i = 0; i < m->m_len; i++) {
1892 printf("%02x ", p[i]);
1893 totlen++;
1894 if (totlen % 16 == 0)
1895 printf("\n");
1896 }
1897 m = m->m_next;
1898 }
1899 if (totlen % 16 != 0)
1900 printf("\n");
1901 printf("---\n");
1902 }
1903
1904 static void
1905 ipsec_attach(void)
1906 {
1907 SECPOLICY_LOCK_INIT(&ip4_def_policy);
1908 ip4_def_policy.refcnt = 1; /* NB: disallow free */
1909 }
1910 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL)
1911
1912
1913 /* XXX this stuff doesn't belong here... */
1914
1915 static struct xformsw* xforms = NULL;
1916
1917 /*
1918 * Register a transform; typically at system startup.
1919 */
1920 void
1921 xform_register(struct xformsw* xsp)
1922 {
1923 xsp->xf_next = xforms;
1924 xforms = xsp;
1925 }
1926
1927 /*
1928 * Initialize transform support in an sav.
1929 */
1930 int
1931 xform_init(struct secasvar *sav, int xftype)
1932 {
1933 struct xformsw *xsp;
1934
1935 if (sav->tdb_xform != NULL) /* previously initialized */
1936 return 0;
1937 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1938 if (xsp->xf_type == xftype)
1939 return (*xsp->xf_init)(sav, xsp);
1940 return EINVAL;
1941 }
Cache object: 4b760b447f25f751a01efb3b6eb7124f
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