FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $FreeBSD: releng/5.2/sys/netipsec/ipsec.c 120585 2003-09-29 22:57:43Z 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 #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 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 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 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, "%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 currsp->refcnt++;
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 bzero(&spidx, sizeof (spidx));
407 return NULL;
408 }
409 spidx.dir = dir;
410
411 sp = KEY_ALLOCSP(&spidx, dir);
412 }
413 if (sp == NULL) /* no SP found, use system default */
414 sp = KEY_ALLOCSP_DEFAULT();
415 IPSEC_ASSERT(sp != NULL, ("null SP"));
416 return sp;
417 }
418
419 struct secpolicy *
420 ipsec4_checkpolicy(m, dir, flag, error, inp)
421 struct mbuf *m;
422 u_int dir, flag;
423 int *error;
424 struct inpcb *inp;
425 {
426 struct secpolicy *sp;
427
428 *error = 0;
429 if (inp == NULL)
430 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
431 else
432 sp = ipsec_getpolicybysock(m, dir, inp, error);
433 if (sp == NULL) {
434 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
435 newipsecstat.ips_out_inval++;
436 return NULL;
437 }
438 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
439 switch (sp->policy) {
440 case IPSEC_POLICY_ENTRUST:
441 default:
442 printf("%s: invalid policy %u\n", __func__, sp->policy);
443 /* fall thru... */
444 case IPSEC_POLICY_DISCARD:
445 newipsecstat.ips_out_polvio++;
446 *error = -EINVAL; /* packet is discarded by caller */
447 break;
448 case IPSEC_POLICY_BYPASS:
449 case IPSEC_POLICY_NONE:
450 KEY_FREESP(&sp);
451 sp = NULL; /* NB: force NULL result */
452 break;
453 case IPSEC_POLICY_IPSEC:
454 if (sp->req == NULL) /* acquire an SA */
455 *error = key_spdacquire(sp);
456 break;
457 }
458 if (*error != 0) {
459 KEY_FREESP(&sp);
460 sp = NULL;
461 }
462 return sp;
463 }
464
465 static int
466 ipsec4_setspidx_inpcb(m, pcb)
467 struct mbuf *m;
468 struct inpcb *pcb;
469 {
470 int error;
471
472 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
473 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
474 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
475 ("null sp_in || sp_out"));
476
477 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
478 if (error == 0) {
479 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
480 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
481 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
482 } else {
483 bzero(&pcb->inp_sp->sp_in->spidx,
484 sizeof (pcb->inp_sp->sp_in->spidx));
485 bzero(&pcb->inp_sp->sp_out->spidx,
486 sizeof (pcb->inp_sp->sp_in->spidx));
487 }
488 return error;
489 }
490
491 #ifdef INET6
492 static int
493 ipsec6_setspidx_in6pcb(m, pcb)
494 struct mbuf *m;
495 struct in6pcb *pcb;
496 {
497 struct secpolicyindex *spidx;
498 int error;
499
500 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
501 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
502 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
503 ("null sp_in || sp_out"));
504
505 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
506 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
507
508 spidx = &pcb->in6p_sp->sp_in->spidx;
509 error = ipsec_setspidx(m, spidx, 1);
510 if (error)
511 goto bad;
512 spidx->dir = IPSEC_DIR_INBOUND;
513
514 spidx = &pcb->in6p_sp->sp_out->spidx;
515 error = ipsec_setspidx(m, spidx, 1);
516 if (error)
517 goto bad;
518 spidx->dir = IPSEC_DIR_OUTBOUND;
519
520 return 0;
521
522 bad:
523 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
524 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
525 return error;
526 }
527 #endif
528
529 /*
530 * configure security policy index (src/dst/proto/sport/dport)
531 * by looking at the content of mbuf.
532 * the caller is responsible for error recovery (like clearing up spidx).
533 */
534 static int
535 ipsec_setspidx(m, spidx, needport)
536 struct mbuf *m;
537 struct secpolicyindex *spidx;
538 int needport;
539 {
540 struct ip *ip = NULL;
541 struct ip ipbuf;
542 u_int v;
543 struct mbuf *n;
544 int len;
545 int error;
546
547 IPSEC_ASSERT(m != NULL, ("null mbuf"));
548
549 /*
550 * validate m->m_pkthdr.len. we see incorrect length if we
551 * mistakenly call this function with inconsistent mbuf chain
552 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
553 */
554 len = 0;
555 for (n = m; n; n = n->m_next)
556 len += n->m_len;
557 if (m->m_pkthdr.len != len) {
558 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
559 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
560 __func__, len, m->m_pkthdr.len));
561 return EINVAL;
562 }
563
564 if (m->m_pkthdr.len < sizeof(struct ip)) {
565 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
566 printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
567 __func__, m->m_pkthdr.len));
568 return EINVAL;
569 }
570
571 if (m->m_len >= sizeof(*ip))
572 ip = mtod(m, struct ip *);
573 else {
574 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
575 ip = &ipbuf;
576 }
577 #ifdef _IP_VHL
578 v = _IP_VHL_V(ip->ip_vhl);
579 #else
580 v = ip->ip_v;
581 #endif
582 switch (v) {
583 case 4:
584 error = ipsec4_setspidx_ipaddr(m, spidx);
585 if (error)
586 return error;
587 ipsec4_get_ulp(m, spidx, needport);
588 return 0;
589 #ifdef INET6
590 case 6:
591 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
592 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
593 printf("%s: pkthdr len(%d) too small (v6), "
594 "ignored\n", __func__, m->m_pkthdr.len));
595 return EINVAL;
596 }
597 error = ipsec6_setspidx_ipaddr(m, spidx);
598 if (error)
599 return error;
600 ipsec6_get_ulp(m, spidx, needport);
601 return 0;
602 #endif
603 default:
604 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
605 printf("%s: " "unknown IP version %u, ignored.\n",
606 __func__, v));
607 return EINVAL;
608 }
609 }
610
611 static void
612 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
613 {
614 u_int8_t nxt;
615 int off;
616
617 /* sanity check */
618 IPSEC_ASSERT(m != NULL, ("null mbuf"));
619 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
620
621 /* NB: ip_input() flips it into host endian XXX need more checking */
622 if (m->m_len < sizeof (struct ip)) {
623 struct ip *ip = mtod(m, struct ip *);
624 if (ip->ip_off & (IP_MF | IP_OFFMASK))
625 goto done;
626 #ifdef _IP_VHL
627 off = _IP_VHL_HL(ip->ip_vhl) << 2;
628 #else
629 off = ip->ip_hl << 2;
630 #endif
631 nxt = ip->ip_p;
632 } else {
633 struct ip ih;
634
635 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
636 if (ih.ip_off & (IP_MF | IP_OFFMASK))
637 goto done;
638 #ifdef _IP_VHL
639 off = _IP_VHL_HL(ih.ip_vhl) << 2;
640 #else
641 off = ih.ip_hl << 2;
642 #endif
643 nxt = ih.ip_p;
644 }
645
646 while (off < m->m_pkthdr.len) {
647 struct ip6_ext ip6e;
648 struct tcphdr th;
649 struct udphdr uh;
650
651 switch (nxt) {
652 case IPPROTO_TCP:
653 spidx->ul_proto = nxt;
654 if (!needport)
655 goto done_proto;
656 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
657 goto done;
658 m_copydata(m, off, sizeof (th), (caddr_t) &th);
659 spidx->src.sin.sin_port = th.th_sport;
660 spidx->dst.sin.sin_port = th.th_dport;
661 return;
662 case IPPROTO_UDP:
663 spidx->ul_proto = nxt;
664 if (!needport)
665 goto done_proto;
666 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
667 goto done;
668 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
669 spidx->src.sin.sin_port = uh.uh_sport;
670 spidx->dst.sin.sin_port = uh.uh_dport;
671 return;
672 case IPPROTO_AH:
673 if (m->m_pkthdr.len > off + sizeof(ip6e))
674 goto done;
675 /* XXX sigh, this works but is totally bogus */
676 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
677 off += (ip6e.ip6e_len + 2) << 2;
678 nxt = ip6e.ip6e_nxt;
679 break;
680 case IPPROTO_ICMP:
681 default:
682 /* XXX intermediate headers??? */
683 spidx->ul_proto = nxt;
684 goto done_proto;
685 }
686 }
687 done:
688 spidx->ul_proto = IPSEC_ULPROTO_ANY;
689 done_proto:
690 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
691 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
692 }
693
694 /* assumes that m is sane */
695 static int
696 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
697 {
698 static const struct sockaddr_in template = {
699 sizeof (struct sockaddr_in),
700 AF_INET,
701 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
702 };
703
704 spidx->src.sin = template;
705 spidx->dst.sin = template;
706
707 if (m->m_len < sizeof (struct ip)) {
708 m_copydata(m, offsetof(struct ip, ip_src),
709 sizeof (struct in_addr),
710 (caddr_t) &spidx->src.sin.sin_addr);
711 m_copydata(m, offsetof(struct ip, ip_dst),
712 sizeof (struct in_addr),
713 (caddr_t) &spidx->dst.sin.sin_addr);
714 } else {
715 struct ip *ip = mtod(m, struct ip *);
716 spidx->src.sin.sin_addr = ip->ip_src;
717 spidx->dst.sin.sin_addr = ip->ip_dst;
718 }
719
720 spidx->prefs = sizeof(struct in_addr) << 3;
721 spidx->prefd = sizeof(struct in_addr) << 3;
722
723 return 0;
724 }
725
726 #ifdef INET6
727 static void
728 ipsec6_get_ulp(m, spidx, needport)
729 struct mbuf *m;
730 struct secpolicyindex *spidx;
731 int needport;
732 {
733 int off, nxt;
734 struct tcphdr th;
735 struct udphdr uh;
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 default:
777 /* XXX intermediate headers??? */
778 spidx->ul_proto = nxt;
779 break;
780 }
781 }
782
783 /* assumes that m is sane */
784 static int
785 ipsec6_setspidx_ipaddr(m, spidx)
786 struct mbuf *m;
787 struct secpolicyindex *spidx;
788 {
789 struct ip6_hdr *ip6 = NULL;
790 struct ip6_hdr ip6buf;
791 struct sockaddr_in6 *sin6;
792
793 if (m->m_len >= sizeof(*ip6))
794 ip6 = mtod(m, struct ip6_hdr *);
795 else {
796 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
797 ip6 = &ip6buf;
798 }
799
800 sin6 = (struct sockaddr_in6 *)&spidx->src;
801 bzero(sin6, sizeof(*sin6));
802 sin6->sin6_family = AF_INET6;
803 sin6->sin6_len = sizeof(struct sockaddr_in6);
804 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
805 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
806 sin6->sin6_addr.s6_addr16[1] = 0;
807 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
808 }
809 spidx->prefs = sizeof(struct in6_addr) << 3;
810
811 sin6 = (struct sockaddr_in6 *)&spidx->dst;
812 bzero(sin6, sizeof(*sin6));
813 sin6->sin6_family = AF_INET6;
814 sin6->sin6_len = sizeof(struct sockaddr_in6);
815 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
816 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
817 sin6->sin6_addr.s6_addr16[1] = 0;
818 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
819 }
820 spidx->prefd = sizeof(struct in6_addr) << 3;
821
822 return 0;
823 }
824 #endif
825
826 static void
827 ipsec_delpcbpolicy(p)
828 struct inpcbpolicy *p;
829 {
830 free(p, M_IPSEC_INPCB);
831 }
832
833 /* initialize policy in PCB */
834 int
835 ipsec_init_policy(so, pcb_sp)
836 struct socket *so;
837 struct inpcbpolicy **pcb_sp;
838 {
839 struct inpcbpolicy *new;
840
841 /* sanity check. */
842 if (so == NULL || pcb_sp == NULL)
843 panic("%s: NULL pointer was passed.\n", __func__);
844
845 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
846 M_IPSEC_INPCB, M_NOWAIT|M_ZERO);
847 if (new == NULL) {
848 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
849 return ENOBUFS;
850 }
851
852 new->priv = IPSEC_IS_PRIVILEGED_SO(so);
853
854 if ((new->sp_in = KEY_NEWSP()) == NULL) {
855 ipsec_delpcbpolicy(new);
856 return ENOBUFS;
857 }
858 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
859 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
860
861 if ((new->sp_out = KEY_NEWSP()) == NULL) {
862 KEY_FREESP(&new->sp_in);
863 ipsec_delpcbpolicy(new);
864 return ENOBUFS;
865 }
866 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
867 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
868
869 *pcb_sp = new;
870
871 return 0;
872 }
873
874 /* copy old ipsec policy into new */
875 int
876 ipsec_copy_policy(old, new)
877 struct inpcbpolicy *old, *new;
878 {
879 struct secpolicy *sp;
880
881 sp = ipsec_deepcopy_policy(old->sp_in);
882 if (sp) {
883 KEY_FREESP(&new->sp_in);
884 new->sp_in = sp;
885 } else
886 return ENOBUFS;
887
888 sp = ipsec_deepcopy_policy(old->sp_out);
889 if (sp) {
890 KEY_FREESP(&new->sp_out);
891 new->sp_out = sp;
892 } else
893 return ENOBUFS;
894
895 new->priv = old->priv;
896
897 return 0;
898 }
899
900 struct ipsecrequest *
901 ipsec_newisr(void)
902 {
903 struct ipsecrequest *p;
904
905 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO);
906 if (p != NULL)
907 IPSECREQUEST_LOCK_INIT(p);
908 return p;
909 }
910
911 void
912 ipsec_delisr(struct ipsecrequest *p)
913 {
914 IPSECREQUEST_LOCK_DESTROY(p);
915 free(p, M_IPSEC_SR);
916 }
917
918 /* deep-copy a policy in PCB */
919 static struct secpolicy *
920 ipsec_deepcopy_policy(src)
921 struct secpolicy *src;
922 {
923 struct ipsecrequest *newchain = NULL;
924 struct ipsecrequest *p;
925 struct ipsecrequest **q;
926 struct ipsecrequest *r;
927 struct secpolicy *dst;
928
929 if (src == NULL)
930 return NULL;
931 dst = KEY_NEWSP();
932 if (dst == NULL)
933 return NULL;
934
935 /*
936 * deep-copy IPsec request chain. This is required since struct
937 * ipsecrequest is not reference counted.
938 */
939 q = &newchain;
940 for (p = src->req; p; p = p->next) {
941 *q = ipsec_newisr();
942 if (*q == NULL)
943 goto fail;
944 (*q)->saidx.proto = p->saidx.proto;
945 (*q)->saidx.mode = p->saidx.mode;
946 (*q)->level = p->level;
947 (*q)->saidx.reqid = p->saidx.reqid;
948
949 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
950 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
951
952 (*q)->sp = dst;
953
954 q = &((*q)->next);
955 }
956
957 dst->req = newchain;
958 dst->state = src->state;
959 dst->policy = src->policy;
960 /* do not touch the refcnt fields */
961
962 return dst;
963
964 fail:
965 for (p = newchain; p; p = r) {
966 r = p->next;
967 ipsec_delisr(p);
968 p = NULL;
969 }
970 return NULL;
971 }
972
973 /* set policy and ipsec request if present. */
974 static int
975 ipsec_set_policy(pcb_sp, optname, request, len, priv)
976 struct secpolicy **pcb_sp;
977 int optname;
978 caddr_t request;
979 size_t len;
980 int priv;
981 {
982 struct sadb_x_policy *xpl;
983 struct secpolicy *newsp = NULL;
984 int error;
985
986 /* sanity check. */
987 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
988 return EINVAL;
989 if (len < sizeof(*xpl))
990 return EINVAL;
991 xpl = (struct sadb_x_policy *)request;
992
993 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
994 printf("%s: passed policy\n", __func__);
995 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
996
997 /* check policy type */
998 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
999 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1000 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1001 return EINVAL;
1002
1003 /* check privileged socket */
1004 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1005 return EACCES;
1006
1007 /* allocation new SP entry */
1008 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1009 return error;
1010
1011 newsp->state = IPSEC_SPSTATE_ALIVE;
1012
1013 /* clear old SP and set new SP */
1014 KEY_FREESP(pcb_sp);
1015 *pcb_sp = newsp;
1016 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1017 printf("%s: new policy\n", __func__);
1018 kdebug_secpolicy(newsp));
1019
1020 return 0;
1021 }
1022
1023 static int
1024 ipsec_get_policy(pcb_sp, mp)
1025 struct secpolicy *pcb_sp;
1026 struct mbuf **mp;
1027 {
1028
1029 /* sanity check. */
1030 if (pcb_sp == NULL || mp == NULL)
1031 return EINVAL;
1032
1033 *mp = key_sp2msg(pcb_sp);
1034 if (!*mp) {
1035 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__));
1036 return ENOBUFS;
1037 }
1038
1039 (*mp)->m_type = MT_DATA;
1040 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1041 printf("%s:\n", __func__); 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, "%s: invalid direction=%u\n", __func__,
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 IPSEC_ASSERT(inp->inp_sp != NULL, ("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, "%s: invalid direction=%u\n", __func__,
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 IPSEC_ASSERT(inp != NULL, ("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, "%s: invalid direction=%u\n", __func__,
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 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("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, "%s: invalid direction=%u\n", __func__,
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 IPSEC_ASSERT(in6p != NULL, ("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 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument"));
1244 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1245 ("af family mismatch, src %u, dst %u",
1246 isr->sp->spidx.src.sa.sa_family,
1247 isr->sp->spidx.dst.sa.sa_family));
1248
1249 /* XXX note that we have ipseclog() expanded here - code sync issue */
1250 #define IPSEC_CHECK_DEFAULT(lev) \
1251 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1252 && (lev) != IPSEC_LEVEL_UNIQUE) \
1253 ? (ipsec_debug \
1254 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1255 (lev), IPSEC_LEVEL_REQUIRE) \
1256 : 0), \
1257 (lev) = IPSEC_LEVEL_REQUIRE, \
1258 (lev) \
1259 : (lev))
1260
1261 /* set default level */
1262 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1263 #ifdef INET
1264 case AF_INET:
1265 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1266 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1267 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1268 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1269 break;
1270 #endif
1271 #ifdef INET6
1272 case AF_INET6:
1273 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1274 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1275 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1276 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1277 break;
1278 #endif /* INET6 */
1279 default:
1280 panic("%s: unknown af %u",
1281 __func__, isr->sp->spidx.src.sa.sa_family);
1282 }
1283
1284 #undef IPSEC_CHECK_DEFAULT
1285
1286 /* set level */
1287 switch (isr->level) {
1288 case IPSEC_LEVEL_DEFAULT:
1289 switch (isr->saidx.proto) {
1290 case IPPROTO_ESP:
1291 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1292 level = esp_net_deflev;
1293 else
1294 level = esp_trans_deflev;
1295 break;
1296 case IPPROTO_AH:
1297 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1298 level = ah_net_deflev;
1299 else
1300 level = ah_trans_deflev;
1301 case IPPROTO_IPCOMP:
1302 /*
1303 * we don't really care, as IPcomp document says that
1304 * we shouldn't compress small packets
1305 */
1306 level = IPSEC_LEVEL_USE;
1307 break;
1308 default:
1309 panic("%s: Illegal protocol defined %u\n", __func__,
1310 isr->saidx.proto);
1311 }
1312 break;
1313
1314 case IPSEC_LEVEL_USE:
1315 case IPSEC_LEVEL_REQUIRE:
1316 level = isr->level;
1317 break;
1318 case IPSEC_LEVEL_UNIQUE:
1319 level = IPSEC_LEVEL_REQUIRE;
1320 break;
1321
1322 default:
1323 panic("%s: Illegal IPsec level %u\n", __func__, isr->level);
1324 }
1325
1326 return level;
1327 }
1328
1329 /*
1330 * Check security policy requirements against the actual
1331 * packet contents. Return one if the packet should be
1332 * reject as "invalid"; otherwiser return zero to have the
1333 * packet treated as "valid".
1334 *
1335 * OUT:
1336 * 0: valid
1337 * 1: invalid
1338 */
1339 int
1340 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1341 {
1342 struct ipsecrequest *isr;
1343 int need_auth;
1344
1345 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1346 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1347
1348 /* check policy */
1349 switch (sp->policy) {
1350 case IPSEC_POLICY_DISCARD:
1351 return 1;
1352 case IPSEC_POLICY_BYPASS:
1353 case IPSEC_POLICY_NONE:
1354 return 0;
1355 }
1356
1357 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1358 ("invalid policy %u", sp->policy));
1359
1360 /* XXX should compare policy against ipsec header history */
1361
1362 need_auth = 0;
1363 for (isr = sp->req; isr != NULL; isr = isr->next) {
1364 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1365 continue;
1366 switch (isr->saidx.proto) {
1367 case IPPROTO_ESP:
1368 if ((m->m_flags & M_DECRYPTED) == 0) {
1369 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1370 printf("%s: ESP m_flags:%x\n", __func__,
1371 m->m_flags));
1372 return 1;
1373 }
1374
1375 if (!need_auth &&
1376 isr->sav != NULL &&
1377 isr->sav->tdb_authalgxform != NULL &&
1378 (m->m_flags & M_AUTHIPDGM) == 0) {
1379 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1380 printf("%s: ESP/AH m_flags:%x\n", __func__,
1381 m->m_flags));
1382 return 1;
1383 }
1384 break;
1385 case IPPROTO_AH:
1386 need_auth = 1;
1387 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1388 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1389 printf("%s: AH m_flags:%x\n", __func__,
1390 m->m_flags));
1391 return 1;
1392 }
1393 break;
1394 case IPPROTO_IPCOMP:
1395 /*
1396 * we don't really care, as IPcomp document
1397 * says that we shouldn't compress small
1398 * packets, IPComp policy should always be
1399 * treated as being in "use" level.
1400 */
1401 break;
1402 }
1403 }
1404 return 0; /* valid */
1405 }
1406
1407 /*
1408 * Check AH/ESP integrity.
1409 * This function is called from tcp_input(), udp_input(),
1410 * and {ah,esp}4_input for tunnel mode
1411 */
1412 int
1413 ipsec4_in_reject(m, inp)
1414 struct mbuf *m;
1415 struct inpcb *inp;
1416 {
1417 struct secpolicy *sp;
1418 int error;
1419 int result;
1420
1421 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1422
1423 /* get SP for this packet.
1424 * When we are called from ip_forward(), we call
1425 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1426 */
1427 if (inp == NULL)
1428 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1429 else
1430 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1431
1432 if (sp != NULL) {
1433 result = ipsec_in_reject(sp, m);
1434 if (result)
1435 newipsecstat.ips_in_polvio++;
1436 KEY_FREESP(&sp);
1437 } else {
1438 result = 0; /* XXX should be panic ?
1439 * -> No, there may be error. */
1440 }
1441 return result;
1442 }
1443
1444 #ifdef INET6
1445 /*
1446 * Check AH/ESP integrity.
1447 * This function is called from tcp6_input(), udp6_input(),
1448 * and {ah,esp}6_input for tunnel mode
1449 */
1450 int
1451 ipsec6_in_reject(m, inp)
1452 struct mbuf *m;
1453 struct inpcb *inp;
1454 {
1455 struct secpolicy *sp = NULL;
1456 int error;
1457 int result;
1458
1459 /* sanity check */
1460 if (m == NULL)
1461 return 0; /* XXX should be panic ? */
1462
1463 /* get SP for this packet.
1464 * When we are called from ip_forward(), we call
1465 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1466 */
1467 if (inp == NULL)
1468 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1469 else
1470 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1471
1472 if (sp != NULL) {
1473 result = ipsec_in_reject(sp, m);
1474 if (result)
1475 newipsecstat.ips_in_polvio++;
1476 KEY_FREESP(&sp);
1477 } else {
1478 result = 0;
1479 }
1480 return result;
1481 }
1482 #endif
1483
1484 /*
1485 * compute the byte size to be occupied by IPsec header.
1486 * in case it is tunneled, it includes the size of outer IP header.
1487 * NOTE: SP passed is free in this function.
1488 */
1489 static size_t
1490 ipsec_hdrsiz(struct secpolicy *sp)
1491 {
1492 struct ipsecrequest *isr;
1493 size_t siz;
1494
1495 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1496 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp));
1497
1498 switch (sp->policy) {
1499 case IPSEC_POLICY_DISCARD:
1500 case IPSEC_POLICY_BYPASS:
1501 case IPSEC_POLICY_NONE:
1502 return 0;
1503 }
1504
1505 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1506 ("invalid policy %u", sp->policy));
1507
1508 siz = 0;
1509 for (isr = sp->req; isr != NULL; isr = isr->next) {
1510 size_t clen = 0;
1511
1512 switch (isr->saidx.proto) {
1513 case IPPROTO_ESP:
1514 clen = esp_hdrsiz(isr->sav);
1515 break;
1516 case IPPROTO_AH:
1517 clen = ah_hdrsiz(isr->sav);
1518 break;
1519 case IPPROTO_IPCOMP:
1520 clen = sizeof(struct ipcomp);
1521 break;
1522 }
1523
1524 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1525 switch (isr->saidx.dst.sa.sa_family) {
1526 case AF_INET:
1527 clen += sizeof(struct ip);
1528 break;
1529 #ifdef INET6
1530 case AF_INET6:
1531 clen += sizeof(struct ip6_hdr);
1532 break;
1533 #endif
1534 default:
1535 ipseclog((LOG_ERR, "%s: unknown AF %d in "
1536 "IPsec tunnel SA\n", __func__,
1537 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1538 break;
1539 }
1540 }
1541 siz += clen;
1542 }
1543
1544 return siz;
1545 }
1546
1547 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1548 size_t
1549 ipsec4_hdrsiz(m, dir, inp)
1550 struct mbuf *m;
1551 u_int dir;
1552 struct inpcb *inp;
1553 {
1554 struct secpolicy *sp;
1555 int error;
1556 size_t size;
1557
1558 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1559
1560 /* get SP for this packet.
1561 * When we are called from ip_forward(), we call
1562 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1563 */
1564 if (inp == NULL)
1565 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1566 else
1567 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1568
1569 if (sp != NULL) {
1570 size = ipsec_hdrsiz(sp);
1571 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1572 printf("%s: size:%lu.\n", __func__,
1573 (unsigned long)size));
1574
1575 KEY_FREESP(&sp);
1576 } else {
1577 size = 0; /* XXX should be panic ? */
1578 }
1579 return size;
1580 }
1581
1582 #ifdef INET6
1583 /* This function is called from ipsec6_hdrsize_tcp(),
1584 * and maybe from ip6_forward.()
1585 */
1586 size_t
1587 ipsec6_hdrsiz(m, dir, in6p)
1588 struct mbuf *m;
1589 u_int dir;
1590 struct in6pcb *in6p;
1591 {
1592 struct secpolicy *sp;
1593 int error;
1594 size_t size;
1595
1596 IPSEC_ASSERT(m != NULL, ("null mbuf"));
1597 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1598 ("socket w/o inpcb"));
1599
1600 /* get SP for this packet */
1601 /* XXX Is it right to call with IP_FORWARDING. */
1602 if (in6p == NULL)
1603 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1604 else
1605 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1606
1607 if (sp == NULL)
1608 return 0;
1609 size = ipsec_hdrsiz(sp);
1610 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1611 printf("%s: size:%lu.\n", __func__, (unsigned long)size));
1612 KEY_FREESP(&sp);
1613
1614 return size;
1615 }
1616 #endif /*INET6*/
1617
1618 /*
1619 * Check the variable replay window.
1620 * ipsec_chkreplay() performs replay check before ICV verification.
1621 * ipsec_updatereplay() updates replay bitmap. This must be called after
1622 * ICV verification (it also performs replay check, which is usually done
1623 * beforehand).
1624 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1625 *
1626 * based on RFC 2401.
1627 */
1628 int
1629 ipsec_chkreplay(seq, sav)
1630 u_int32_t seq;
1631 struct secasvar *sav;
1632 {
1633 const struct secreplay *replay;
1634 u_int32_t diff;
1635 int fr;
1636 u_int32_t wsizeb; /* constant: bits of window size */
1637 int frlast; /* constant: last frame */
1638
1639 IPSEC_SPLASSERT_SOFTNET(__func__);
1640
1641 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1642 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1643
1644 replay = sav->replay;
1645
1646 if (replay->wsize == 0)
1647 return 1; /* no need to check replay. */
1648
1649 /* constant */
1650 frlast = replay->wsize - 1;
1651 wsizeb = replay->wsize << 3;
1652
1653 /* sequence number of 0 is invalid */
1654 if (seq == 0)
1655 return 0;
1656
1657 /* first time is always okay */
1658 if (replay->count == 0)
1659 return 1;
1660
1661 if (seq > replay->lastseq) {
1662 /* larger sequences are okay */
1663 return 1;
1664 } else {
1665 /* seq is equal or less than lastseq. */
1666 diff = replay->lastseq - seq;
1667
1668 /* over range to check, i.e. too old or wrapped */
1669 if (diff >= wsizeb)
1670 return 0;
1671
1672 fr = frlast - diff / 8;
1673
1674 /* this packet already seen ? */
1675 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1676 return 0;
1677
1678 /* out of order but good */
1679 return 1;
1680 }
1681 }
1682
1683 /*
1684 * check replay counter whether to update or not.
1685 * OUT: 0: OK
1686 * 1: NG
1687 */
1688 int
1689 ipsec_updatereplay(seq, sav)
1690 u_int32_t seq;
1691 struct secasvar *sav;
1692 {
1693 struct secreplay *replay;
1694 u_int32_t diff;
1695 int fr;
1696 u_int32_t wsizeb; /* constant: bits of window size */
1697 int frlast; /* constant: last frame */
1698
1699 IPSEC_SPLASSERT_SOFTNET(__func__);
1700
1701 IPSEC_ASSERT(sav != NULL, ("Null SA"));
1702 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state"));
1703
1704 replay = sav->replay;
1705
1706 if (replay->wsize == 0)
1707 goto ok; /* no need to check replay. */
1708
1709 /* constant */
1710 frlast = replay->wsize - 1;
1711 wsizeb = replay->wsize << 3;
1712
1713 /* sequence number of 0 is invalid */
1714 if (seq == 0)
1715 return 1;
1716
1717 /* first time */
1718 if (replay->count == 0) {
1719 replay->lastseq = seq;
1720 bzero(replay->bitmap, replay->wsize);
1721 (replay->bitmap)[frlast] = 1;
1722 goto ok;
1723 }
1724
1725 if (seq > replay->lastseq) {
1726 /* seq is larger than lastseq. */
1727 diff = seq - replay->lastseq;
1728
1729 /* new larger sequence number */
1730 if (diff < wsizeb) {
1731 /* In window */
1732 /* set bit for this packet */
1733 vshiftl(replay->bitmap, diff, replay->wsize);
1734 (replay->bitmap)[frlast] |= 1;
1735 } else {
1736 /* this packet has a "way larger" */
1737 bzero(replay->bitmap, replay->wsize);
1738 (replay->bitmap)[frlast] = 1;
1739 }
1740 replay->lastseq = seq;
1741
1742 /* larger is good */
1743 } else {
1744 /* seq is equal or less than lastseq. */
1745 diff = replay->lastseq - seq;
1746
1747 /* over range to check, i.e. too old or wrapped */
1748 if (diff >= wsizeb)
1749 return 1;
1750
1751 fr = frlast - diff / 8;
1752
1753 /* this packet already seen ? */
1754 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1755 return 1;
1756
1757 /* mark as seen */
1758 (replay->bitmap)[fr] |= (1 << (diff % 8));
1759
1760 /* out of order but good */
1761 }
1762
1763 ok:
1764 if (replay->count == ~0) {
1765
1766 /* set overflow flag */
1767 replay->overflow++;
1768
1769 /* don't increment, no more packets accepted */
1770 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1771 return 1;
1772
1773 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n",
1774 __func__, replay->overflow, ipsec_logsastr(sav)));
1775 }
1776
1777 replay->count++;
1778
1779 return 0;
1780 }
1781
1782 /*
1783 * shift variable length bunffer to left.
1784 * IN: bitmap: pointer to the buffer
1785 * nbit: the number of to shift.
1786 * wsize: buffer size (bytes).
1787 */
1788 static void
1789 vshiftl(bitmap, nbit, wsize)
1790 unsigned char *bitmap;
1791 int nbit, wsize;
1792 {
1793 int s, j, i;
1794 unsigned char over;
1795
1796 for (j = 0; j < nbit; j += 8) {
1797 s = (nbit - j < 8) ? (nbit - j): 8;
1798 bitmap[0] <<= s;
1799 for (i = 1; i < wsize; i++) {
1800 over = (bitmap[i] >> (8 - s));
1801 bitmap[i] <<= s;
1802 bitmap[i-1] |= over;
1803 }
1804 }
1805
1806 return;
1807 }
1808
1809 /* Return a printable string for the IPv4 address. */
1810 static char *
1811 inet_ntoa4(struct in_addr ina)
1812 {
1813 static char buf[4][4 * sizeof "123" + 4];
1814 unsigned char *ucp = (unsigned char *) &ina;
1815 static int i = 3;
1816
1817 i = (i + 1) % 4;
1818 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff,
1819 ucp[2] & 0xff, ucp[3] & 0xff);
1820 return (buf[i]);
1821 }
1822
1823 /* Return a printable string for the address. */
1824 char *
1825 ipsec_address(union sockaddr_union* sa)
1826 {
1827 switch (sa->sa.sa_family) {
1828 #if INET
1829 case AF_INET:
1830 return inet_ntoa4(sa->sin.sin_addr);
1831 #endif /* INET */
1832
1833 #if INET6
1834 case AF_INET6:
1835 return ip6_sprintf(&sa->sin6.sin6_addr);
1836 #endif /* INET6 */
1837
1838 default:
1839 return "(unknown address family)";
1840 }
1841 }
1842
1843 const char *
1844 ipsec_logsastr(sav)
1845 struct secasvar *sav;
1846 {
1847 static char buf[256];
1848 char *p;
1849 struct secasindex *saidx = &sav->sah->saidx;
1850
1851 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1852 ("address family mismatch"));
1853
1854 p = buf;
1855 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1856 while (p && *p)
1857 p++;
1858 /* NB: only use ipsec_address on one address at a time */
1859 snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1860 ipsec_address(&saidx->src));
1861 while (p && *p)
1862 p++;
1863 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1864 ipsec_address(&saidx->dst));
1865
1866 return buf;
1867 }
1868
1869 void
1870 ipsec_dumpmbuf(m)
1871 struct mbuf *m;
1872 {
1873 int totlen;
1874 int i;
1875 u_char *p;
1876
1877 totlen = 0;
1878 printf("---\n");
1879 while (m) {
1880 p = mtod(m, u_char *);
1881 for (i = 0; i < m->m_len; i++) {
1882 printf("%02x ", p[i]);
1883 totlen++;
1884 if (totlen % 16 == 0)
1885 printf("\n");
1886 }
1887 m = m->m_next;
1888 }
1889 if (totlen % 16 != 0)
1890 printf("\n");
1891 printf("---\n");
1892 }
1893
1894 /* XXX this stuff doesn't belong here... */
1895
1896 static struct xformsw* xforms = NULL;
1897
1898 /*
1899 * Register a transform; typically at system startup.
1900 */
1901 void
1902 xform_register(struct xformsw* xsp)
1903 {
1904 xsp->xf_next = xforms;
1905 xforms = xsp;
1906 }
1907
1908 /*
1909 * Initialize transform support in an sav.
1910 */
1911 int
1912 xform_init(struct secasvar *sav, int xftype)
1913 {
1914 struct xformsw *xsp;
1915
1916 if (sav->tdb_xform != NULL) /* previously initialized */
1917 return 0;
1918 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1919 if (xsp->xf_type == xftype)
1920 return (*xsp->xf_init)(sav, xsp);
1921 return EINVAL;
1922 }
Cache object: e76744a9a5a2da5c6c73872731e69290
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