FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $FreeBSD: releng/5.1/sys/netipsec/ipsec.c 111682 2003-02-28 20:06:29Z sam $ */
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
284 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
285 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
286 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
287 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
288 ("ipsec_getpolicybysock: 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 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: 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 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: 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 currsp->refcnt++;
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, "ipsec_getpolicybysock: "
333 "Invalid policy for PCB %d\n", 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, "ipsec_getpolicybysock: "
343 "Illegal policy for non-priviliged defined %d\n",
344 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 currsp->refcnt++;
354 sp = currsp;
355 break;
356
357 default:
358 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
359 "Invalid policy for PCB %d\n", currsp->policy));
360 *error = EINVAL;
361 return NULL;
362 }
363 }
364 }
365 KASSERT(sp != NULL,
366 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
367 pcbsp->priv, currsp->policy));
368 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
369 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
370 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
371 sp, sp->refcnt));
372 return sp;
373 }
374
375 /*
376 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
377 * and return a pointer to SP.
378 * OUT: positive: a pointer to the entry for security policy leaf matched.
379 * NULL: no apropreate SP found, the following value is set to error.
380 * 0 : bypass
381 * EACCES : discard packet.
382 * ENOENT : ipsec_acquire() in progress, maybe.
383 * others : error occured.
384 */
385 struct secpolicy *
386 ipsec_getpolicybyaddr(m, dir, flag, error)
387 struct mbuf *m;
388 u_int dir;
389 int flag;
390 int *error;
391 {
392 struct secpolicyindex spidx;
393 struct secpolicy *sp;
394
395 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
396 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
397 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
398 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
399
400 sp = NULL;
401 if (key_havesp(dir)) {
402 /* Make an index to look for a policy. */
403 *error = ipsec_setspidx(m, &spidx,
404 (flag & IP_FORWARDING) ? 0 : 1);
405 if (*error != 0) {
406 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
407 " dir %u flag %u\n", dir, flag));
408 bzero(&spidx, sizeof (spidx));
409 return NULL;
410 }
411 spidx.dir = dir;
412
413 sp = KEY_ALLOCSP(&spidx, dir);
414 }
415 if (sp == NULL) /* no SP found, use system default */
416 sp = KEY_ALLOCSP_DEFAULT();
417 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
418 return sp;
419 }
420
421 struct secpolicy *
422 ipsec4_checkpolicy(m, dir, flag, error, inp)
423 struct mbuf *m;
424 u_int dir, flag;
425 int *error;
426 struct inpcb *inp;
427 {
428 struct secpolicy *sp;
429
430 *error = 0;
431 if (inp == NULL)
432 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
433 else
434 sp = ipsec_getpolicybysock(m, dir, inp, error);
435 if (sp == NULL) {
436 KASSERT(*error != 0,
437 ("ipsec4_checkpolicy: getpolicy failed w/o error"));
438 newipsecstat.ips_out_inval++;
439 return NULL;
440 }
441 KASSERT(*error == 0,
442 ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
443 switch (sp->policy) {
444 case IPSEC_POLICY_ENTRUST:
445 default:
446 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
447 /* fall thru... */
448 case IPSEC_POLICY_DISCARD:
449 newipsecstat.ips_out_polvio++;
450 *error = -EINVAL; /* packet is discarded by caller */
451 break;
452 case IPSEC_POLICY_BYPASS:
453 case IPSEC_POLICY_NONE:
454 KEY_FREESP(&sp);
455 sp = NULL; /* NB: force NULL result */
456 break;
457 case IPSEC_POLICY_IPSEC:
458 if (sp->req == NULL) /* acquire an SA */
459 *error = key_spdacquire(sp);
460 break;
461 }
462 if (*error != 0) {
463 KEY_FREESP(&sp);
464 sp = NULL;
465 }
466 return sp;
467 }
468
469 static int
470 ipsec4_setspidx_inpcb(m, pcb)
471 struct mbuf *m;
472 struct inpcb *pcb;
473 {
474 int error;
475
476 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
477 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
478 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
479 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
480
481 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
482 if (error == 0) {
483 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
484 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
485 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
486 } else {
487 bzero(&pcb->inp_sp->sp_in->spidx,
488 sizeof (pcb->inp_sp->sp_in->spidx));
489 bzero(&pcb->inp_sp->sp_out->spidx,
490 sizeof (pcb->inp_sp->sp_in->spidx));
491 }
492 return error;
493 }
494
495 #ifdef INET6
496 static int
497 ipsec6_setspidx_in6pcb(m, pcb)
498 struct mbuf *m;
499 struct in6pcb *pcb;
500 {
501 struct secpolicyindex *spidx;
502 int error;
503
504 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
505 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
506 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
507 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
508
509 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
510 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
511
512 spidx = &pcb->in6p_sp->sp_in->spidx;
513 error = ipsec_setspidx(m, spidx, 1);
514 if (error)
515 goto bad;
516 spidx->dir = IPSEC_DIR_INBOUND;
517
518 spidx = &pcb->in6p_sp->sp_out->spidx;
519 error = ipsec_setspidx(m, spidx, 1);
520 if (error)
521 goto bad;
522 spidx->dir = IPSEC_DIR_OUTBOUND;
523
524 return 0;
525
526 bad:
527 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
528 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
529 return error;
530 }
531 #endif
532
533 /*
534 * configure security policy index (src/dst/proto/sport/dport)
535 * by looking at the content of mbuf.
536 * the caller is responsible for error recovery (like clearing up spidx).
537 */
538 static int
539 ipsec_setspidx(m, spidx, needport)
540 struct mbuf *m;
541 struct secpolicyindex *spidx;
542 int needport;
543 {
544 struct ip *ip = NULL;
545 struct ip ipbuf;
546 u_int v;
547 struct mbuf *n;
548 int len;
549 int error;
550
551 KASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
552
553 /*
554 * validate m->m_pkthdr.len. we see incorrect length if we
555 * mistakenly call this function with inconsistent mbuf chain
556 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
557 */
558 len = 0;
559 for (n = m; n; n = n->m_next)
560 len += n->m_len;
561 if (m->m_pkthdr.len != len) {
562 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
563 printf("ipsec_setspidx: "
564 "total of m_len(%d) != pkthdr.len(%d), "
565 "ignored.\n",
566 len, m->m_pkthdr.len));
567 return EINVAL;
568 }
569
570 if (m->m_pkthdr.len < sizeof(struct ip)) {
571 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
572 printf("ipsec_setspidx: "
573 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
574 m->m_pkthdr.len));
575 return EINVAL;
576 }
577
578 if (m->m_len >= sizeof(*ip))
579 ip = mtod(m, struct ip *);
580 else {
581 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
582 ip = &ipbuf;
583 }
584 #ifdef _IP_VHL
585 v = _IP_VHL_V(ip->ip_vhl);
586 #else
587 v = ip->ip_v;
588 #endif
589 switch (v) {
590 case 4:
591 error = ipsec4_setspidx_ipaddr(m, spidx);
592 if (error)
593 return error;
594 ipsec4_get_ulp(m, spidx, needport);
595 return 0;
596 #ifdef INET6
597 case 6:
598 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
599 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
600 printf("ipsec_setspidx: "
601 "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
602 "ignored.\n", m->m_pkthdr.len));
603 return EINVAL;
604 }
605 error = ipsec6_setspidx_ipaddr(m, spidx);
606 if (error)
607 return error;
608 ipsec6_get_ulp(m, spidx, needport);
609 return 0;
610 #endif
611 default:
612 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
613 printf("ipsec_setspidx: "
614 "unknown IP version %u, ignored.\n", v));
615 return EINVAL;
616 }
617 }
618
619 static void
620 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
621 {
622 u_int8_t nxt;
623 int off;
624
625 /* sanity check */
626 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
627 KASSERT(m->m_pkthdr.len >= sizeof(struct ip),
628 ("ipsec4_get_ulp: packet too short"));
629
630 /* NB: ip_input() flips it into host endian XXX need more checking */
631 if (m->m_len < sizeof (struct ip)) {
632 struct ip *ip = mtod(m, struct ip *);
633 if (ip->ip_off & (IP_MF | IP_OFFMASK))
634 goto done;
635 #ifdef _IP_VHL
636 off = _IP_VHL_HL(ip->ip_vhl) << 2;
637 #else
638 off = ip->ip_hl << 2;
639 #endif
640 nxt = ip->ip_p;
641 } else {
642 struct ip ih;
643
644 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
645 if (ih.ip_off & (IP_MF | IP_OFFMASK))
646 goto done;
647 #ifdef _IP_VHL
648 off = _IP_VHL_HL(ih.ip_vhl) << 2;
649 #else
650 off = ih.ip_hl << 2;
651 #endif
652 nxt = ih.ip_p;
653 }
654
655 while (off < m->m_pkthdr.len) {
656 struct ip6_ext ip6e;
657 struct tcphdr th;
658 struct udphdr uh;
659
660 switch (nxt) {
661 case IPPROTO_TCP:
662 spidx->ul_proto = nxt;
663 if (!needport)
664 goto done_proto;
665 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
666 goto done;
667 m_copydata(m, off, sizeof (th), (caddr_t) &th);
668 spidx->src.sin.sin_port = th.th_sport;
669 spidx->dst.sin.sin_port = th.th_dport;
670 return;
671 case IPPROTO_UDP:
672 spidx->ul_proto = nxt;
673 if (!needport)
674 goto done_proto;
675 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
676 goto done;
677 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
678 spidx->src.sin.sin_port = uh.uh_sport;
679 spidx->dst.sin.sin_port = uh.uh_dport;
680 return;
681 case IPPROTO_AH:
682 if (m->m_pkthdr.len > off + sizeof(ip6e))
683 goto done;
684 /* XXX sigh, this works but is totally bogus */
685 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
686 off += (ip6e.ip6e_len + 2) << 2;
687 nxt = ip6e.ip6e_nxt;
688 break;
689 case IPPROTO_ICMP:
690 default:
691 /* XXX intermediate headers??? */
692 spidx->ul_proto = nxt;
693 goto done_proto;
694 }
695 }
696 done:
697 spidx->ul_proto = IPSEC_ULPROTO_ANY;
698 done_proto:
699 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
700 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
701 }
702
703 /* assumes that m is sane */
704 static int
705 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
706 {
707 static const struct sockaddr_in template = {
708 sizeof (struct sockaddr_in),
709 AF_INET,
710 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
711 };
712
713 spidx->src.sin = template;
714 spidx->dst.sin = template;
715
716 if (m->m_len < sizeof (struct ip)) {
717 m_copydata(m, offsetof(struct ip, ip_src),
718 sizeof (struct in_addr),
719 (caddr_t) &spidx->src.sin.sin_addr);
720 m_copydata(m, offsetof(struct ip, ip_dst),
721 sizeof (struct in_addr),
722 (caddr_t) &spidx->dst.sin.sin_addr);
723 } else {
724 struct ip *ip = mtod(m, struct ip *);
725 spidx->src.sin.sin_addr = ip->ip_src;
726 spidx->dst.sin.sin_addr = ip->ip_dst;
727 }
728
729 spidx->prefs = sizeof(struct in_addr) << 3;
730 spidx->prefd = sizeof(struct in_addr) << 3;
731
732 return 0;
733 }
734
735 #ifdef INET6
736 static void
737 ipsec6_get_ulp(m, spidx, needport)
738 struct mbuf *m;
739 struct secpolicyindex *spidx;
740 int needport;
741 {
742 int off, nxt;
743 struct tcphdr th;
744 struct udphdr uh;
745
746 /* sanity check */
747 if (m == NULL)
748 panic("ipsec6_get_ulp: NULL pointer was passed.\n");
749
750 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
751 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
752
753 /* set default */
754 spidx->ul_proto = IPSEC_ULPROTO_ANY;
755 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
756 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
757
758 nxt = -1;
759 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
760 if (off < 0 || m->m_pkthdr.len < off)
761 return;
762
763 switch (nxt) {
764 case IPPROTO_TCP:
765 spidx->ul_proto = nxt;
766 if (!needport)
767 break;
768 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
769 break;
770 m_copydata(m, off, sizeof(th), (caddr_t)&th);
771 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
772 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
773 break;
774 case IPPROTO_UDP:
775 spidx->ul_proto = nxt;
776 if (!needport)
777 break;
778 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
779 break;
780 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
781 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
782 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
783 break;
784 case IPPROTO_ICMPV6:
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_SECA);
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("ipsec_init_policy: NULL pointer was passed.\n");
853
854 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
855 M_SECA, M_NOWAIT|M_ZERO);
856 if (new == NULL) {
857 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
858 return ENOBUFS;
859 }
860
861 if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
862 new->priv = 1;
863 else
864 new->priv = 0;
865
866 if ((new->sp_in = KEY_NEWSP()) == NULL) {
867 ipsec_delpcbpolicy(new);
868 return ENOBUFS;
869 }
870 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
871 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
872
873 if ((new->sp_out = KEY_NEWSP()) == NULL) {
874 KEY_FREESP(&new->sp_in);
875 ipsec_delpcbpolicy(new);
876 return ENOBUFS;
877 }
878 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
879 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
880
881 *pcb_sp = new;
882
883 return 0;
884 }
885
886 /* copy old ipsec policy into new */
887 int
888 ipsec_copy_policy(old, new)
889 struct inpcbpolicy *old, *new;
890 {
891 struct secpolicy *sp;
892
893 sp = ipsec_deepcopy_policy(old->sp_in);
894 if (sp) {
895 KEY_FREESP(&new->sp_in);
896 new->sp_in = sp;
897 } else
898 return ENOBUFS;
899
900 sp = ipsec_deepcopy_policy(old->sp_out);
901 if (sp) {
902 KEY_FREESP(&new->sp_out);
903 new->sp_out = sp;
904 } else
905 return ENOBUFS;
906
907 new->priv = old->priv;
908
909 return 0;
910 }
911
912 /* deep-copy a policy in PCB */
913 static struct secpolicy *
914 ipsec_deepcopy_policy(src)
915 struct secpolicy *src;
916 {
917 struct ipsecrequest *newchain = NULL;
918 struct ipsecrequest *p;
919 struct ipsecrequest **q;
920 struct ipsecrequest *r;
921 struct secpolicy *dst;
922
923 if (src == NULL)
924 return NULL;
925 dst = KEY_NEWSP();
926 if (dst == NULL)
927 return NULL;
928
929 /*
930 * deep-copy IPsec request chain. This is required since struct
931 * ipsecrequest is not reference counted.
932 */
933 q = &newchain;
934 for (p = src->req; p; p = p->next) {
935 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
936 M_SECA, M_NOWAIT);
937 if (*q == NULL)
938 goto fail;
939 bzero(*q, sizeof(**q));
940 (*q)->next = NULL;
941
942 (*q)->saidx.proto = p->saidx.proto;
943 (*q)->saidx.mode = p->saidx.mode;
944 (*q)->level = p->level;
945 (*q)->saidx.reqid = p->saidx.reqid;
946
947 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
948 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
949
950 (*q)->sav = NULL;
951 (*q)->sp = dst;
952
953 q = &((*q)->next);
954 }
955
956 dst->req = newchain;
957 dst->state = src->state;
958 dst->policy = src->policy;
959 /* do not touch the refcnt fields */
960
961 return dst;
962
963 fail:
964 for (p = newchain; p; p = r) {
965 r = p->next;
966 free(p, M_SECA);
967 p = NULL;
968 }
969 return NULL;
970 }
971
972 /* set policy and ipsec request if present. */
973 static int
974 ipsec_set_policy(pcb_sp, optname, request, len, priv)
975 struct secpolicy **pcb_sp;
976 int optname;
977 caddr_t request;
978 size_t len;
979 int priv;
980 {
981 struct sadb_x_policy *xpl;
982 struct secpolicy *newsp = NULL;
983 int error;
984
985 /* sanity check. */
986 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
987 return EINVAL;
988 if (len < sizeof(*xpl))
989 return EINVAL;
990 xpl = (struct sadb_x_policy *)request;
991
992 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
993 printf("ipsec_set_policy: passed policy\n");
994 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
995
996 /* check policy type */
997 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
998 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
999 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1000 return EINVAL;
1001
1002 /* check privileged socket */
1003 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1004 return EACCES;
1005
1006 /* allocation new SP entry */
1007 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1008 return error;
1009
1010 newsp->state = IPSEC_SPSTATE_ALIVE;
1011
1012 /* clear old SP and set new SP */
1013 KEY_FREESP(pcb_sp);
1014 *pcb_sp = newsp;
1015 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1016 printf("ipsec_set_policy: new policy\n");
1017 kdebug_secpolicy(newsp));
1018
1019 return 0;
1020 }
1021
1022 static int
1023 ipsec_get_policy(pcb_sp, mp)
1024 struct secpolicy *pcb_sp;
1025 struct mbuf **mp;
1026 {
1027
1028 /* sanity check. */
1029 if (pcb_sp == NULL || mp == NULL)
1030 return EINVAL;
1031
1032 *mp = key_sp2msg(pcb_sp);
1033 if (!*mp) {
1034 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1035 return ENOBUFS;
1036 }
1037
1038 (*mp)->m_type = MT_DATA;
1039 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1040 printf("ipsec_get_policy:\n");
1041 kdebug_mbuf(*mp));
1042
1043 return 0;
1044 }
1045
1046 int
1047 ipsec4_set_policy(inp, optname, request, len, priv)
1048 struct inpcb *inp;
1049 int optname;
1050 caddr_t request;
1051 size_t len;
1052 int priv;
1053 {
1054 struct sadb_x_policy *xpl;
1055 struct secpolicy **pcb_sp;
1056
1057 /* sanity check. */
1058 if (inp == NULL || request == NULL)
1059 return EINVAL;
1060 if (len < sizeof(*xpl))
1061 return EINVAL;
1062 xpl = (struct sadb_x_policy *)request;
1063
1064 /* select direction */
1065 switch (xpl->sadb_x_policy_dir) {
1066 case IPSEC_DIR_INBOUND:
1067 pcb_sp = &inp->inp_sp->sp_in;
1068 break;
1069 case IPSEC_DIR_OUTBOUND:
1070 pcb_sp = &inp->inp_sp->sp_out;
1071 break;
1072 default:
1073 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1074 xpl->sadb_x_policy_dir));
1075 return EINVAL;
1076 }
1077
1078 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1079 }
1080
1081 int
1082 ipsec4_get_policy(inp, request, len, mp)
1083 struct inpcb *inp;
1084 caddr_t request;
1085 size_t len;
1086 struct mbuf **mp;
1087 {
1088 struct sadb_x_policy *xpl;
1089 struct secpolicy *pcb_sp;
1090
1091 /* sanity check. */
1092 if (inp == NULL || request == NULL || mp == NULL)
1093 return EINVAL;
1094 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1095 if (len < sizeof(*xpl))
1096 return EINVAL;
1097 xpl = (struct sadb_x_policy *)request;
1098
1099 /* select direction */
1100 switch (xpl->sadb_x_policy_dir) {
1101 case IPSEC_DIR_INBOUND:
1102 pcb_sp = inp->inp_sp->sp_in;
1103 break;
1104 case IPSEC_DIR_OUTBOUND:
1105 pcb_sp = inp->inp_sp->sp_out;
1106 break;
1107 default:
1108 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1109 xpl->sadb_x_policy_dir));
1110 return EINVAL;
1111 }
1112
1113 return ipsec_get_policy(pcb_sp, mp);
1114 }
1115
1116 /* delete policy in PCB */
1117 int
1118 ipsec4_delete_pcbpolicy(inp)
1119 struct inpcb *inp;
1120 {
1121 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1122
1123 if (inp->inp_sp == NULL)
1124 return 0;
1125
1126 if (inp->inp_sp->sp_in != NULL)
1127 KEY_FREESP(&inp->inp_sp->sp_in);
1128
1129 if (inp->inp_sp->sp_out != NULL)
1130 KEY_FREESP(&inp->inp_sp->sp_out);
1131
1132 ipsec_delpcbpolicy(inp->inp_sp);
1133 inp->inp_sp = NULL;
1134
1135 return 0;
1136 }
1137
1138 #ifdef INET6
1139 int
1140 ipsec6_set_policy(in6p, optname, request, len, priv)
1141 struct in6pcb *in6p;
1142 int optname;
1143 caddr_t request;
1144 size_t len;
1145 int priv;
1146 {
1147 struct sadb_x_policy *xpl;
1148 struct secpolicy **pcb_sp;
1149
1150 /* sanity check. */
1151 if (in6p == NULL || request == NULL)
1152 return EINVAL;
1153 if (len < sizeof(*xpl))
1154 return EINVAL;
1155 xpl = (struct sadb_x_policy *)request;
1156
1157 /* select direction */
1158 switch (xpl->sadb_x_policy_dir) {
1159 case IPSEC_DIR_INBOUND:
1160 pcb_sp = &in6p->in6p_sp->sp_in;
1161 break;
1162 case IPSEC_DIR_OUTBOUND:
1163 pcb_sp = &in6p->in6p_sp->sp_out;
1164 break;
1165 default:
1166 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1167 xpl->sadb_x_policy_dir));
1168 return EINVAL;
1169 }
1170
1171 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1172 }
1173
1174 int
1175 ipsec6_get_policy(in6p, request, len, mp)
1176 struct in6pcb *in6p;
1177 caddr_t request;
1178 size_t len;
1179 struct mbuf **mp;
1180 {
1181 struct sadb_x_policy *xpl;
1182 struct secpolicy *pcb_sp;
1183
1184 /* sanity check. */
1185 if (in6p == NULL || request == NULL || mp == NULL)
1186 return EINVAL;
1187 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1188 if (len < sizeof(*xpl))
1189 return EINVAL;
1190 xpl = (struct sadb_x_policy *)request;
1191
1192 /* select direction */
1193 switch (xpl->sadb_x_policy_dir) {
1194 case IPSEC_DIR_INBOUND:
1195 pcb_sp = in6p->in6p_sp->sp_in;
1196 break;
1197 case IPSEC_DIR_OUTBOUND:
1198 pcb_sp = in6p->in6p_sp->sp_out;
1199 break;
1200 default:
1201 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1202 xpl->sadb_x_policy_dir));
1203 return EINVAL;
1204 }
1205
1206 return ipsec_get_policy(pcb_sp, mp);
1207 }
1208
1209 int
1210 ipsec6_delete_pcbpolicy(in6p)
1211 struct in6pcb *in6p;
1212 {
1213 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1214
1215 if (in6p->in6p_sp == NULL)
1216 return 0;
1217
1218 if (in6p->in6p_sp->sp_in != NULL)
1219 KEY_FREESP(&in6p->in6p_sp->sp_in);
1220
1221 if (in6p->in6p_sp->sp_out != NULL)
1222 KEY_FREESP(&in6p->in6p_sp->sp_out);
1223
1224 ipsec_delpcbpolicy(in6p->in6p_sp);
1225 in6p->in6p_sp = NULL;
1226
1227 return 0;
1228 }
1229 #endif
1230
1231 /*
1232 * return current level.
1233 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1234 */
1235 u_int
1236 ipsec_get_reqlevel(isr)
1237 struct ipsecrequest *isr;
1238 {
1239 u_int level = 0;
1240 u_int esp_trans_deflev, esp_net_deflev;
1241 u_int ah_trans_deflev, ah_net_deflev;
1242
1243 KASSERT(isr != NULL && isr->sp != NULL,
1244 ("ipsec_get_reqlevel: null argument"));
1245 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1246 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1247 isr->sp->spidx.src.sa.sa_family,
1248 isr->sp->spidx.dst.sa.sa_family));
1249
1250 /* XXX note that we have ipseclog() expanded here - code sync issue */
1251 #define IPSEC_CHECK_DEFAULT(lev) \
1252 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1253 && (lev) != IPSEC_LEVEL_UNIQUE) \
1254 ? (ipsec_debug \
1255 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1256 (lev), IPSEC_LEVEL_REQUIRE) \
1257 : 0), \
1258 (lev) = IPSEC_LEVEL_REQUIRE, \
1259 (lev) \
1260 : (lev))
1261
1262 /* set default level */
1263 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1264 #ifdef INET
1265 case AF_INET:
1266 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1267 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1268 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1269 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1270 break;
1271 #endif
1272 #ifdef INET6
1273 case AF_INET6:
1274 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1275 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1276 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1277 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1278 break;
1279 #endif /* INET6 */
1280 default:
1281 panic("key_get_reqlevel: unknown af %u",
1282 isr->sp->spidx.src.sa.sa_family);
1283 }
1284
1285 #undef IPSEC_CHECK_DEFAULT
1286
1287 /* set level */
1288 switch (isr->level) {
1289 case IPSEC_LEVEL_DEFAULT:
1290 switch (isr->saidx.proto) {
1291 case IPPROTO_ESP:
1292 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1293 level = esp_net_deflev;
1294 else
1295 level = esp_trans_deflev;
1296 break;
1297 case IPPROTO_AH:
1298 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1299 level = ah_net_deflev;
1300 else
1301 level = ah_trans_deflev;
1302 case IPPROTO_IPCOMP:
1303 /*
1304 * we don't really care, as IPcomp document says that
1305 * we shouldn't compress small packets
1306 */
1307 level = IPSEC_LEVEL_USE;
1308 break;
1309 default:
1310 panic("ipsec_get_reqlevel: "
1311 "Illegal protocol defined %u\n",
1312 isr->saidx.proto);
1313 }
1314 break;
1315
1316 case IPSEC_LEVEL_USE:
1317 case IPSEC_LEVEL_REQUIRE:
1318 level = isr->level;
1319 break;
1320 case IPSEC_LEVEL_UNIQUE:
1321 level = IPSEC_LEVEL_REQUIRE;
1322 break;
1323
1324 default:
1325 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
1326 isr->level);
1327 }
1328
1329 return level;
1330 }
1331
1332 /*
1333 * Check security policy requirements against the actual
1334 * packet contents. Return one if the packet should be
1335 * reject as "invalid"; otherwiser return zero to have the
1336 * packet treated as "valid".
1337 *
1338 * OUT:
1339 * 0: valid
1340 * 1: invalid
1341 */
1342 int
1343 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1344 {
1345 struct ipsecrequest *isr;
1346 int need_auth;
1347
1348 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1349 printf("ipsec_in_reject: using SP\n");
1350 kdebug_secpolicy(sp));
1351
1352 /* check policy */
1353 switch (sp->policy) {
1354 case IPSEC_POLICY_DISCARD:
1355 return 1;
1356 case IPSEC_POLICY_BYPASS:
1357 case IPSEC_POLICY_NONE:
1358 return 0;
1359 }
1360
1361 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1362 ("ipsec_in_reject: invalid policy %u", sp->policy));
1363
1364 /* XXX should compare policy against ipsec header history */
1365
1366 need_auth = 0;
1367 for (isr = sp->req; isr != NULL; isr = isr->next) {
1368 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1369 continue;
1370 switch (isr->saidx.proto) {
1371 case IPPROTO_ESP:
1372 if ((m->m_flags & M_DECRYPTED) == 0) {
1373 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1374 printf("ipsec_in_reject: ESP m_flags:%x\n",
1375 m->m_flags));
1376 return 1;
1377 }
1378
1379 if (!need_auth &&
1380 isr->sav != NULL &&
1381 isr->sav->tdb_authalgxform != NULL &&
1382 (m->m_flags & M_AUTHIPDGM) == 0) {
1383 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1384 printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1385 m->m_flags));
1386 return 1;
1387 }
1388 break;
1389 case IPPROTO_AH:
1390 need_auth = 1;
1391 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1392 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1393 printf("ipsec_in_reject: AH m_flags:%x\n",
1394 m->m_flags));
1395 return 1;
1396 }
1397 break;
1398 case IPPROTO_IPCOMP:
1399 /*
1400 * we don't really care, as IPcomp document
1401 * says that we shouldn't compress small
1402 * packets, IPComp policy should always be
1403 * treated as being in "use" level.
1404 */
1405 break;
1406 }
1407 }
1408 return 0; /* valid */
1409 }
1410
1411 /*
1412 * Check AH/ESP integrity.
1413 * This function is called from tcp_input(), udp_input(),
1414 * and {ah,esp}4_input for tunnel mode
1415 */
1416 int
1417 ipsec4_in_reject(m, inp)
1418 struct mbuf *m;
1419 struct inpcb *inp;
1420 {
1421 struct secpolicy *sp;
1422 int error;
1423 int result;
1424
1425 KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1426
1427 /* get SP for this packet.
1428 * When we are called from ip_forward(), we call
1429 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1430 */
1431 if (inp == NULL)
1432 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1433 else
1434 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1435
1436 if (sp != NULL) {
1437 result = ipsec_in_reject(sp, m);
1438 if (result)
1439 newipsecstat.ips_in_polvio++;
1440 KEY_FREESP(&sp);
1441 } else {
1442 result = 0; /* XXX should be panic ?
1443 * -> No, there may be error. */
1444 }
1445 return result;
1446 }
1447
1448 #ifdef INET6
1449 /*
1450 * Check AH/ESP integrity.
1451 * This function is called from tcp6_input(), udp6_input(),
1452 * and {ah,esp}6_input for tunnel mode
1453 */
1454 int
1455 ipsec6_in_reject(m, inp)
1456 struct mbuf *m;
1457 struct inpcb *inp;
1458 {
1459 struct secpolicy *sp = NULL;
1460 int error;
1461 int result;
1462
1463 /* sanity check */
1464 if (m == NULL)
1465 return 0; /* XXX should be panic ? */
1466
1467 /* get SP for this packet.
1468 * When we are called from ip_forward(), we call
1469 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1470 */
1471 if (inp == NULL)
1472 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1473 else
1474 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1475
1476 if (sp != NULL) {
1477 result = ipsec_in_reject(sp, m);
1478 if (result)
1479 newipsecstat.ips_in_polvio++;
1480 KEY_FREESP(&sp);
1481 } else {
1482 result = 0;
1483 }
1484 return result;
1485 }
1486 #endif
1487
1488 /*
1489 * compute the byte size to be occupied by IPsec header.
1490 * in case it is tunneled, it includes the size of outer IP header.
1491 * NOTE: SP passed is free in this function.
1492 */
1493 static size_t
1494 ipsec_hdrsiz(struct secpolicy *sp)
1495 {
1496 struct ipsecrequest *isr;
1497 size_t siz;
1498
1499 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1500 printf("ipsec_hdrsiz: using SP\n");
1501 kdebug_secpolicy(sp));
1502
1503 switch (sp->policy) {
1504 case IPSEC_POLICY_DISCARD:
1505 case IPSEC_POLICY_BYPASS:
1506 case IPSEC_POLICY_NONE:
1507 return 0;
1508 }
1509
1510 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1511 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1512
1513 siz = 0;
1514 for (isr = sp->req; isr != NULL; isr = isr->next) {
1515 size_t clen = 0;
1516
1517 switch (isr->saidx.proto) {
1518 case IPPROTO_ESP:
1519 clen = esp_hdrsiz(isr->sav);
1520 break;
1521 case IPPROTO_AH:
1522 clen = ah_hdrsiz(isr->sav);
1523 break;
1524 case IPPROTO_IPCOMP:
1525 clen = sizeof(struct ipcomp);
1526 break;
1527 }
1528
1529 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1530 switch (isr->saidx.dst.sa.sa_family) {
1531 case AF_INET:
1532 clen += sizeof(struct ip);
1533 break;
1534 #ifdef INET6
1535 case AF_INET6:
1536 clen += sizeof(struct ip6_hdr);
1537 break;
1538 #endif
1539 default:
1540 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1541 "unknown AF %d in IPsec tunnel SA\n",
1542 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1543 break;
1544 }
1545 }
1546 siz += clen;
1547 }
1548
1549 return siz;
1550 }
1551
1552 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1553 size_t
1554 ipsec4_hdrsiz(m, dir, inp)
1555 struct mbuf *m;
1556 u_int dir;
1557 struct inpcb *inp;
1558 {
1559 struct secpolicy *sp;
1560 int error;
1561 size_t size;
1562
1563 KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1564
1565 /* get SP for this packet.
1566 * When we are called from ip_forward(), we call
1567 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1568 */
1569 if (inp == NULL)
1570 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1571 else
1572 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1573
1574 if (sp != NULL) {
1575 size = ipsec_hdrsiz(sp);
1576 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1577 printf("ipsec4_hdrsiz: size:%lu.\n",
1578 (unsigned long)size));
1579
1580 KEY_FREESP(&sp);
1581 } else {
1582 size = 0; /* XXX should be panic ? */
1583 }
1584 return size;
1585 }
1586
1587 #ifdef INET6
1588 /* This function is called from ipsec6_hdrsize_tcp(),
1589 * and maybe from ip6_forward.()
1590 */
1591 size_t
1592 ipsec6_hdrsiz(m, dir, in6p)
1593 struct mbuf *m;
1594 u_int dir;
1595 struct in6pcb *in6p;
1596 {
1597 struct secpolicy *sp;
1598 int error;
1599 size_t size;
1600
1601 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1602 KASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1603 ("ipsec6_hdrsize: socket w/o inpcb"));
1604
1605 /* get SP for this packet */
1606 /* XXX Is it right to call with IP_FORWARDING. */
1607 if (in6p == NULL)
1608 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1609 else
1610 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1611
1612 if (sp == NULL)
1613 return 0;
1614 size = ipsec_hdrsiz(sp);
1615 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1616 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1617 KEY_FREESP(&sp);
1618
1619 return size;
1620 }
1621 #endif /*INET6*/
1622
1623 /*
1624 * Check the variable replay window.
1625 * ipsec_chkreplay() performs replay check before ICV verification.
1626 * ipsec_updatereplay() updates replay bitmap. This must be called after
1627 * ICV verification (it also performs replay check, which is usually done
1628 * beforehand).
1629 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1630 *
1631 * based on RFC 2401.
1632 */
1633 int
1634 ipsec_chkreplay(seq, sav)
1635 u_int32_t seq;
1636 struct secasvar *sav;
1637 {
1638 const struct secreplay *replay;
1639 u_int32_t diff;
1640 int fr;
1641 u_int32_t wsizeb; /* constant: bits of window size */
1642 int frlast; /* constant: last frame */
1643
1644 #if 0
1645 SPLASSERT(net, "ipsec_chkreplay");
1646 #endif
1647
1648 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1649 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1650
1651 replay = sav->replay;
1652
1653 if (replay->wsize == 0)
1654 return 1; /* no need to check replay. */
1655
1656 /* constant */
1657 frlast = replay->wsize - 1;
1658 wsizeb = replay->wsize << 3;
1659
1660 /* sequence number of 0 is invalid */
1661 if (seq == 0)
1662 return 0;
1663
1664 /* first time is always okay */
1665 if (replay->count == 0)
1666 return 1;
1667
1668 if (seq > replay->lastseq) {
1669 /* larger sequences are okay */
1670 return 1;
1671 } else {
1672 /* seq is equal or less than lastseq. */
1673 diff = replay->lastseq - seq;
1674
1675 /* over range to check, i.e. too old or wrapped */
1676 if (diff >= wsizeb)
1677 return 0;
1678
1679 fr = frlast - diff / 8;
1680
1681 /* this packet already seen ? */
1682 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1683 return 0;
1684
1685 /* out of order but good */
1686 return 1;
1687 }
1688 }
1689
1690 /*
1691 * check replay counter whether to update or not.
1692 * OUT: 0: OK
1693 * 1: NG
1694 */
1695 int
1696 ipsec_updatereplay(seq, sav)
1697 u_int32_t seq;
1698 struct secasvar *sav;
1699 {
1700 struct secreplay *replay;
1701 u_int32_t diff;
1702 int fr;
1703 u_int32_t wsizeb; /* constant: bits of window size */
1704 int frlast; /* constant: last frame */
1705
1706 #if 0
1707 SPLASSERT(net, "ipsec_updatereplay");
1708 #endif
1709
1710 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
1711 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
1712
1713 replay = sav->replay;
1714
1715 if (replay->wsize == 0)
1716 goto ok; /* no need to check replay. */
1717
1718 /* constant */
1719 frlast = replay->wsize - 1;
1720 wsizeb = replay->wsize << 3;
1721
1722 /* sequence number of 0 is invalid */
1723 if (seq == 0)
1724 return 1;
1725
1726 /* first time */
1727 if (replay->count == 0) {
1728 replay->lastseq = seq;
1729 bzero(replay->bitmap, replay->wsize);
1730 (replay->bitmap)[frlast] = 1;
1731 goto ok;
1732 }
1733
1734 if (seq > replay->lastseq) {
1735 /* seq is larger than lastseq. */
1736 diff = seq - replay->lastseq;
1737
1738 /* new larger sequence number */
1739 if (diff < wsizeb) {
1740 /* In window */
1741 /* set bit for this packet */
1742 vshiftl(replay->bitmap, diff, replay->wsize);
1743 (replay->bitmap)[frlast] |= 1;
1744 } else {
1745 /* this packet has a "way larger" */
1746 bzero(replay->bitmap, replay->wsize);
1747 (replay->bitmap)[frlast] = 1;
1748 }
1749 replay->lastseq = seq;
1750
1751 /* larger is good */
1752 } else {
1753 /* seq is equal or less than lastseq. */
1754 diff = replay->lastseq - seq;
1755
1756 /* over range to check, i.e. too old or wrapped */
1757 if (diff >= wsizeb)
1758 return 1;
1759
1760 fr = frlast - diff / 8;
1761
1762 /* this packet already seen ? */
1763 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1764 return 1;
1765
1766 /* mark as seen */
1767 (replay->bitmap)[fr] |= (1 << (diff % 8));
1768
1769 /* out of order but good */
1770 }
1771
1772 ok:
1773 if (replay->count == ~0) {
1774
1775 /* set overflow flag */
1776 replay->overflow++;
1777
1778 /* don't increment, no more packets accepted */
1779 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1780 return 1;
1781
1782 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
1783 replay->overflow, ipsec_logsastr(sav)));
1784 }
1785
1786 replay->count++;
1787
1788 return 0;
1789 }
1790
1791 /*
1792 * shift variable length bunffer to left.
1793 * IN: bitmap: pointer to the buffer
1794 * nbit: the number of to shift.
1795 * wsize: buffer size (bytes).
1796 */
1797 static void
1798 vshiftl(bitmap, nbit, wsize)
1799 unsigned char *bitmap;
1800 int nbit, wsize;
1801 {
1802 int s, j, i;
1803 unsigned char over;
1804
1805 for (j = 0; j < nbit; j += 8) {
1806 s = (nbit - j < 8) ? (nbit - j): 8;
1807 bitmap[0] <<= s;
1808 for (i = 1; i < wsize; i++) {
1809 over = (bitmap[i] >> (8 - s));
1810 bitmap[i] <<= s;
1811 bitmap[i-1] |= over;
1812 }
1813 }
1814
1815 return;
1816 }
1817
1818 /* Return a printable string for the IPv4 address. */
1819 static char *
1820 inet_ntoa4(struct in_addr ina)
1821 {
1822 static char buf[4][4 * sizeof "123" + 4];
1823 unsigned char *ucp = (unsigned char *) &ina;
1824 static int i = 3;
1825
1826 i = (i + 1) % 4;
1827 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1828 ucp[2] & 0xff, ucp[3] & 0xff);
1829 return (buf[i]);
1830 }
1831
1832 /* Return a printable string for the address. */
1833 char *
1834 ipsec_address(union sockaddr_union* sa)
1835 {
1836 switch (sa->sa.sa_family) {
1837 #if INET
1838 case AF_INET:
1839 return inet_ntoa4(sa->sin.sin_addr);
1840 #endif /* INET */
1841
1842 #if INET6
1843 case AF_INET6:
1844 return ip6_sprintf(&sa->sin6.sin6_addr);
1845 #endif /* INET6 */
1846
1847 default:
1848 return "(unknown address family)";
1849 }
1850 }
1851
1852 const char *
1853 ipsec_logsastr(sav)
1854 struct secasvar *sav;
1855 {
1856 static char buf[256];
1857 char *p;
1858 struct secasindex *saidx = &sav->sah->saidx;
1859
1860 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1861 ("ipsec_logsastr: address family mismatch"));
1862
1863 p = buf;
1864 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1865 while (p && *p)
1866 p++;
1867 /* NB: only use ipsec_address on one address at a time */
1868 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1869 ipsec_address(&saidx->src));
1870 while (p && *p)
1871 p++;
1872 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1873 ipsec_address(&saidx->dst));
1874
1875 return buf;
1876 }
1877
1878 void
1879 ipsec_dumpmbuf(m)
1880 struct mbuf *m;
1881 {
1882 int totlen;
1883 int i;
1884 u_char *p;
1885
1886 totlen = 0;
1887 printf("---\n");
1888 while (m) {
1889 p = mtod(m, u_char *);
1890 for (i = 0; i < m->m_len; i++) {
1891 printf("%02x ", p[i]);
1892 totlen++;
1893 if (totlen % 16 == 0)
1894 printf("\n");
1895 }
1896 m = m->m_next;
1897 }
1898 if (totlen % 16 != 0)
1899 printf("\n");
1900 printf("---\n");
1901 }
1902
1903 /* XXX this stuff doesn't belong here... */
1904
1905 static struct xformsw* xforms = NULL;
1906
1907 /*
1908 * Register a transform; typically at system startup.
1909 */
1910 void
1911 xform_register(struct xformsw* xsp)
1912 {
1913 xsp->xf_next = xforms;
1914 xforms = xsp;
1915 }
1916
1917 /*
1918 * Initialize transform support in an sav.
1919 */
1920 int
1921 xform_init(struct secasvar *sav, int xftype)
1922 {
1923 struct xformsw *xsp;
1924
1925 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1926 if (xsp->xf_type == xftype)
1927 return (*xsp->xf_init)(sav, xsp);
1928 return EINVAL;
1929 }
Cache object: b01ebea594aa988f7dfd51073fcec985
|