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MFC 1.117 - fix desiredvnodes calculation for machines with >2G ram.
[dragonfly.git] / sys / netproto / ipsec / ipsec.c
blobf05863e7a93d4535eca620f78fd6c6626e19cc07
1 /* $FreeBSD: src/sys/netipsec/ipsec.c,v 1.2.2.1 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netproto/ipsec/ipsec.c,v 1.19 2006/12/22 23:57:54 swildner Exp $ */
3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
4
5 /*
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * IPsec controller part.
36 */
37
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_ipsec.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/malloc.h>
45 #include <sys/mbuf.h>
46 #include <sys/domain.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/socketvar.h>
50 #include <sys/errno.h>
51 #include <sys/time.h>
52 #include <sys/kernel.h>
53 #include <sys/syslog.h>
54 #include <sys/sysctl.h>
55 #include <sys/proc.h>
56 #include <sys/in_cksum.h>
57
58 #include <net/if.h>
59 #include <net/route.h>
60
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/ip.h>
64 #include <netinet/ip_var.h>
65 #include <netinet/in_var.h>
66 #include <netinet/udp.h>
67 #include <netinet/udp_var.h>
68 #include <netinet/tcp.h>
69 #include <netinet/udp.h>
70
71 #include <netinet/ip6.h>
72 #ifdef INET6
73 #include <netinet6/ip6_var.h>
74 #endif
75 #include <netinet/in_pcb.h>
76 #ifdef INET6
77 #include <netinet/icmp6.h>
78 #endif
79
80 #include <netproto/ipsec/ipsec.h>
81 #ifdef INET6
82 #include <netproto/ipsec/ipsec6.h>
83 #endif
84 #include <netproto/ipsec/ah_var.h>
85 #include <netproto/ipsec/esp_var.h>
86 #include <netproto/ipsec/ipcomp.h> /*XXX*/
87 #include <netproto/ipsec/ipcomp_var.h>
88
89 #include <netproto/ipsec/key.h>
90 #include <netproto/ipsec/keydb.h>
91 #include <netproto/ipsec/key_debug.h>
92
93 #include <netproto/ipsec/xform.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 (struct mbuf *, struct inpcb *pcb);
187 #ifdef INET6
188 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *pcb);
189 #endif
190 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int);
191 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
192 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
193 #ifdef INET6
194 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int);
195 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *);
196 #endif
197 static void ipsec_delpcbpolicy (struct inpcbpolicy *);
198 static struct secpolicy *ipsec_deepcopy_policy (struct secpolicy *src);
199 static int ipsec_set_policy (struct secpolicy **pcb_sp,
200 int optname, caddr_t request, size_t len, int priv);
201 static int ipsec_get_policy (struct secpolicy *pcb_sp, struct mbuf **mp);
202 static void vshiftl (unsigned char *, int, int);
203 static size_t ipsec_hdrsiz (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 kprintf("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 kprintf("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(struct mbuf *m, u_int dir, struct inpcb *inp,
275 int *error)
276 {
277 struct inpcbpolicy *pcbsp = NULL;
278 struct secpolicy *currsp = NULL; /* policy on socket */
279 struct secpolicy *sp;
280 int af;
281
282 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
283 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
284 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
285 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
286 ("ipsec_getpolicybysock: invalid direction %u", dir));
287
288 af = inp->inp_socket->so_proto->pr_domain->dom_family;
289 KASSERT(af == AF_INET || af == AF_INET6,
290 ("ipsec_getpolicybysock: unexpected protocol family %u", af));
291
292 switch (af) {
293 case AF_INET:
294 /* set spidx in pcb */
295 *error = ipsec4_setspidx_inpcb(m, inp);
296 pcbsp = inp->inp_sp;
297 break;
298 #ifdef INET6
299 case AF_INET6:
300 /* set spidx in pcb */
301 *error = ipsec6_setspidx_in6pcb(m, inp);
302 pcbsp = inp->in6p_sp;
303 break;
304 #endif
305 default:
306 *error = EPFNOSUPPORT;
307 break;
308 }
309 if (*error)
310 return NULL;
311
312 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
313 switch (dir) {
314 case IPSEC_DIR_INBOUND:
315 currsp = pcbsp->sp_in;
316 break;
317 case IPSEC_DIR_OUTBOUND:
318 currsp = pcbsp->sp_out;
319 break;
320 }
321 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
322
323 if (pcbsp->priv) { /* when privilieged socket */
324 switch (currsp->policy) {
325 case IPSEC_POLICY_BYPASS:
326 case IPSEC_POLICY_IPSEC:
327 currsp->refcnt++;
328 sp = currsp;
329 break;
330
331 case IPSEC_POLICY_ENTRUST:
332 /* look for a policy in SPD */
333 sp = KEY_ALLOCSP(&currsp->spidx, dir);
334 if (sp == NULL) /* no SP found */
335 sp = KEY_ALLOCSP_DEFAULT();
336 break;
337
338 default:
339 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
340 "Invalid policy for PCB %d\n", currsp->policy));
341 *error = EINVAL;
342 return NULL;
343 }
344 } else { /* unpriv, SPD has policy */
345 sp = KEY_ALLOCSP(&currsp->spidx, dir);
346 if (sp == NULL) { /* no SP found */
347 switch (currsp->policy) {
348 case IPSEC_POLICY_BYPASS:
349 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
350 "Illegal policy for non-priviliged defined %d\n",
351 currsp->policy));
352 *error = EINVAL;
353 return NULL;
354
355 case IPSEC_POLICY_ENTRUST:
356 sp = KEY_ALLOCSP_DEFAULT();
357 break;
358
359 case IPSEC_POLICY_IPSEC:
360 currsp->refcnt++;
361 sp = currsp;
362 break;
363
364 default:
365 ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
366 "Invalid policy for PCB %d\n", currsp->policy));
367 *error = EINVAL;
368 return NULL;
369 }
370 }
371 }
372 KASSERT(sp != NULL,
373 ("ipsec_getpolicybysock: null SP (priv %u policy %u",
374 pcbsp->priv, currsp->policy));
375 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
376 kprintf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
377 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
378 sp, sp->refcnt));
379 return sp;
380 }
381
382 /*
383 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
384 * and return a pointer to SP.
385 * OUT: positive: a pointer to the entry for security policy leaf matched.
386 * NULL: no apropreate SP found, the following value is set to error.
387 * 0 : bypass
388 * EACCES : discard packet.
389 * ENOENT : ipsec_acquire() in progress, maybe.
390 * others : error occured.
391 */
392 struct secpolicy *
393 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error)
394 {
395 struct secpolicyindex spidx;
396 struct secpolicy *sp;
397
398 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
399 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
400 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
401 ("ipsec4_getpolicybaddr: invalid direction %u", dir));
402
403 sp = NULL;
404 if (key_havesp(dir)) {
405 /* Make an index to look for a policy. */
406 *error = ipsec_setspidx(m, &spidx,
407 (flag & IP_FORWARDING) ? 0 : 1);
408 if (*error != 0) {
409 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
410 " dir %u flag %u\n", dir, flag));
411 bzero(&spidx, sizeof (spidx));
412 return NULL;
413 }
414 spidx.dir = dir;
415
416 sp = KEY_ALLOCSP(&spidx, dir);
417 }
418 if (sp == NULL) /* no SP found, use system default */
419 sp = KEY_ALLOCSP_DEFAULT();
420 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
421 return sp;
422 }
423
424 struct secpolicy *
425 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, 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 kprintf("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(struct mbuf *m, struct inpcb *pcb)
471 {
472 int error;
473
474 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
475 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
476 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
477 ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
478
479 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
480 if (error == 0) {
481 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
482 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
483 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
484 } else {
485 bzero(&pcb->inp_sp->sp_in->spidx,
486 sizeof (pcb->inp_sp->sp_in->spidx));
487 bzero(&pcb->inp_sp->sp_out->spidx,
488 sizeof (pcb->inp_sp->sp_in->spidx));
489 }
490 return error;
491 }
492
493 #ifdef INET6
494 static int
495 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb)
496 {
497 struct secpolicyindex *spidx;
498 int error;
499
500 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
501 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
502 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
503 ("ipsec6_setspidx_in6pcb: 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(struct mbuf *m, struct secpolicyindex *spidx, int needport)
536 {
537 struct ip *ip = NULL;
538 struct ip ipbuf;
539 u_int v;
540 struct mbuf *n;
541 int len;
542 int error;
543
544 KASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
545
546 /*
547 * validate m->m_pkthdr.len. we see incorrect length if we
548 * mistakenly call this function with inconsistent mbuf chain
549 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
550 */
551 len = 0;
552 for (n = m; n; n = n->m_next)
553 len += n->m_len;
554 if (m->m_pkthdr.len != len) {
555 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
556 kprintf("ipsec_setspidx: "
557 "total of m_len(%d) != pkthdr.len(%d), "
558 "ignored.\n",
559 len, m->m_pkthdr.len));
560 return EINVAL;
561 }
562
563 if (m->m_pkthdr.len < sizeof(struct ip)) {
564 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
565 kprintf("ipsec_setspidx: "
566 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
567 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 kprintf("ipsec_setspidx: "
594 "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
595 "ignored.\n", m->m_pkthdr.len));
596 return EINVAL;
597 }
598 error = ipsec6_setspidx_ipaddr(m, spidx);
599 if (error)
600 return error;
601 ipsec6_get_ulp(m, spidx, needport);
602 return 0;
603 #endif
604 default:
605 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
606 kprintf("ipsec_setspidx: "
607 "unknown IP version %u, ignored.\n", v));
608 return EINVAL;
609 }
610 }
611
612 static void
613 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
614 {
615 u_int8_t nxt;
616 int off;
617
618 /* sanity check */
619 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
620 KASSERT(m->m_pkthdr.len >= sizeof(struct ip),
621 ("ipsec4_get_ulp: packet too short"));
622
623 /* NB: ip_input() flips it into host endian XXX need more checking */
624 if (m->m_len < sizeof (struct ip)) {
625 struct ip *ip = mtod(m, struct ip *);
626 if (ip->ip_off & (IP_MF | IP_OFFMASK))
627 goto done;
628 #ifdef _IP_VHL
629 off = _IP_VHL_HL(ip->ip_vhl) << 2;
630 #else
631 off = ip->ip_hl << 2;
632 #endif
633 nxt = ip->ip_p;
634 } else {
635 struct ip ih;
636
637 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
638 if (ih.ip_off & (IP_MF | IP_OFFMASK))
639 goto done;
640 #ifdef _IP_VHL
641 off = _IP_VHL_HL(ih.ip_vhl) << 2;
642 #else
643 off = ih.ip_hl << 2;
644 #endif
645 nxt = ih.ip_p;
646 }
647
648 while (off < m->m_pkthdr.len) {
649 struct ip6_ext ip6e;
650 struct tcphdr th;
651 struct udphdr uh;
652
653 switch (nxt) {
654 case IPPROTO_TCP:
655 spidx->ul_proto = nxt;
656 if (!needport)
657 goto done_proto;
658 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
659 goto done;
660 m_copydata(m, off, sizeof (th), (caddr_t) &th);
661 spidx->src.sin.sin_port = th.th_sport;
662 spidx->dst.sin.sin_port = th.th_dport;
663 return;
664 case IPPROTO_UDP:
665 spidx->ul_proto = nxt;
666 if (!needport)
667 goto done_proto;
668 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
669 goto done;
670 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
671 spidx->src.sin.sin_port = uh.uh_sport;
672 spidx->dst.sin.sin_port = uh.uh_dport;
673 return;
674 case IPPROTO_AH:
675 if (off + sizeof(ip6e) > m->m_pkthdr.len)
676 goto done;
677 /* XXX sigh, this works but is totally bogus */
678 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
679 off += (ip6e.ip6e_len + 2) << 2;
680 nxt = ip6e.ip6e_nxt;
681 break;
682 case IPPROTO_ICMP:
683 default:
684 /* XXX intermediate headers??? */
685 spidx->ul_proto = nxt;
686 goto done_proto;
687 }
688 }
689 done:
690 spidx->ul_proto = IPSEC_ULPROTO_ANY;
691 done_proto:
692 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
693 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
694 }
695
696 /* assumes that m is sane */
697 static int
698 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
699 {
700 static const struct sockaddr_in template = {
701 sizeof (struct sockaddr_in),
702 AF_INET,
703 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
704 };
705
706 spidx->src.sin = template;
707 spidx->dst.sin = template;
708
709 if (m->m_len < sizeof (struct ip)) {
710 m_copydata(m, offsetof(struct ip, ip_src),
711 sizeof (struct in_addr),
712 (caddr_t) &spidx->src.sin.sin_addr);
713 m_copydata(m, offsetof(struct ip, ip_dst),
714 sizeof (struct in_addr),
715 (caddr_t) &spidx->dst.sin.sin_addr);
716 } else {
717 struct ip *ip = mtod(m, struct ip *);
718 spidx->src.sin.sin_addr = ip->ip_src;
719 spidx->dst.sin.sin_addr = ip->ip_dst;
720 }
721
722 spidx->prefs = sizeof(struct in_addr) << 3;
723 spidx->prefd = sizeof(struct in_addr) << 3;
724
725 return 0;
726 }
727
728 #ifdef INET6
729 static void
730 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
731 {
732 int off, nxt;
733 struct tcphdr th;
734 struct udphdr uh;
735
736 /* sanity check */
737 if (m == NULL)
738 panic("ipsec6_get_ulp: NULL pointer was passed.\n");
739
740 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
741 kprintf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
742
743 /* set default */
744 spidx->ul_proto = IPSEC_ULPROTO_ANY;
745 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
746 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
747
748 nxt = -1;
749 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
750 if (off < 0 || m->m_pkthdr.len < off)
751 return;
752
753 switch (nxt) {
754 case IPPROTO_TCP:
755 spidx->ul_proto = nxt;
756 if (!needport)
757 break;
758 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
759 break;
760 m_copydata(m, off, sizeof(th), (caddr_t)&th);
761 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
762 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
763 break;
764 case IPPROTO_UDP:
765 spidx->ul_proto = nxt;
766 if (!needport)
767 break;
768 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
769 break;
770 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
771 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
772 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
773 break;
774 case IPPROTO_ICMPV6:
775 default:
776 /* XXX intermediate headers??? */
777 spidx->ul_proto = nxt;
778 break;
779 }
780 }
781
782 /* assumes that m is sane */
783 static int
784 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
785 {
786 struct ip6_hdr *ip6 = NULL;
787 struct ip6_hdr ip6buf;
788 struct sockaddr_in6 *sin6;
789
790 if (m->m_len >= sizeof(*ip6))
791 ip6 = mtod(m, struct ip6_hdr *);
792 else {
793 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
794 ip6 = &ip6buf;
795 }
796
797 sin6 = (struct sockaddr_in6 *)&spidx->src;
798 bzero(sin6, sizeof(*sin6));
799 sin6->sin6_family = AF_INET6;
800 sin6->sin6_len = sizeof(struct sockaddr_in6);
801 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
802 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
803 sin6->sin6_addr.s6_addr16[1] = 0;
804 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
805 }
806 spidx->prefs = sizeof(struct in6_addr) << 3;
807
808 sin6 = (struct sockaddr_in6 *)&spidx->dst;
809 bzero(sin6, sizeof(*sin6));
810 sin6->sin6_family = AF_INET6;
811 sin6->sin6_len = sizeof(struct sockaddr_in6);
812 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
813 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
814 sin6->sin6_addr.s6_addr16[1] = 0;
815 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
816 }
817 spidx->prefd = sizeof(struct in6_addr) << 3;
818
819 return 0;
820 }
821 #endif
822
823 static void
824 ipsec_delpcbpolicy(struct inpcbpolicy *p)
825 {
826 kfree(p, M_SECA);
827 }
828
829 /* initialize policy in PCB */
830 int
831 ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp)
832 {
833 struct inpcbpolicy *new;
834
835 /* sanity check. */
836 if (so == NULL || pcb_sp == NULL)
837 panic("ipsec_init_policy: NULL pointer was passed.\n");
838
839 new = kmalloc(sizeof(struct inpcbpolicy),
840 M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
841 if (new == NULL) {
842 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
843 return ENOBUFS;
844 }
845
846 if (so->so_cred != 0 && so->so_cred->cr_uid == 0)
847 new->priv = 1;
848 else
849 new->priv = 0;
850
851 if ((new->sp_in = KEY_NEWSP()) == NULL) {
852 ipsec_delpcbpolicy(new);
853 return ENOBUFS;
854 }
855 new->sp_in->state = IPSEC_SPSTATE_ALIVE;
856 new->sp_in->policy = IPSEC_POLICY_ENTRUST;
857
858 if ((new->sp_out = KEY_NEWSP()) == NULL) {
859 KEY_FREESP(&new->sp_in);
860 ipsec_delpcbpolicy(new);
861 return ENOBUFS;
862 }
863 new->sp_out->state = IPSEC_SPSTATE_ALIVE;
864 new->sp_out->policy = IPSEC_POLICY_ENTRUST;
865
866 *pcb_sp = new;
867
868 return 0;
869 }
870
871 /* copy old ipsec policy into new */
872 int
873 ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new)
874 {
875 struct secpolicy *sp;
876
877 sp = ipsec_deepcopy_policy(old->sp_in);
878 if (sp) {
879 KEY_FREESP(&new->sp_in);
880 new->sp_in = sp;
881 } else
882 return ENOBUFS;
883
884 sp = ipsec_deepcopy_policy(old->sp_out);
885 if (sp) {
886 KEY_FREESP(&new->sp_out);
887 new->sp_out = sp;
888 } else
889 return ENOBUFS;
890
891 new->priv = old->priv;
892
893 return 0;
894 }
895
896 /* deep-copy a policy in PCB */
897 static struct secpolicy *
898 ipsec_deepcopy_policy(struct secpolicy *src)
899 {
900 struct ipsecrequest *newchain = NULL;
901 struct ipsecrequest *p;
902 struct ipsecrequest **q;
903 struct ipsecrequest *r;
904 struct secpolicy *dst;
905
906 if (src == NULL)
907 return NULL;
908 dst = KEY_NEWSP();
909 if (dst == NULL)
910 return NULL;
911
912 /*
913 * deep-copy IPsec request chain. This is required since struct
914 * ipsecrequest is not reference counted.
915 */
916 q = &newchain;
917 for (p = src->req; p; p = p->next) {
918 *q = kmalloc(sizeof(struct ipsecrequest),
919 M_SECA, M_INTWAIT | M_ZERO | M_NULLOK);
920 if (*q == NULL)
921 goto fail;
922 (*q)->next = NULL;
923
924 (*q)->saidx.proto = p->saidx.proto;
925 (*q)->saidx.mode = p->saidx.mode;
926 (*q)->level = p->level;
927 (*q)->saidx.reqid = p->saidx.reqid;
928
929 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
930 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
931
932 (*q)->sav = NULL;
933 (*q)->sp = dst;
934
935 q = &((*q)->next);
936 }
937
938 dst->req = newchain;
939 dst->state = src->state;
940 dst->policy = src->policy;
941 /* do not touch the refcnt fields */
942
943 return dst;
944
945 fail:
946 for (p = newchain; p; p = r) {
947 r = p->next;
948 kfree(p, M_SECA);
949 p = NULL;
950 }
951 return NULL;
952 }
953
954 /* set policy and ipsec request if present. */
955 static int
956 ipsec_set_policy(struct secpolicy **pcb_sp, int optname, caddr_t request,
957 size_t len, int priv)
958 {
959 struct sadb_x_policy *xpl;
960 struct secpolicy *newsp = NULL;
961 int error;
962
963 /* sanity check. */
964 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
965 return EINVAL;
966 if (len < sizeof(*xpl))
967 return EINVAL;
968 xpl = (struct sadb_x_policy *)request;
969
970 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
971 kprintf("ipsec_set_policy: passed policy\n");
972 kdebug_sadb_x_policy((struct sadb_ext *)xpl));
973
974 /* check policy type */
975 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
976 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
977 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
978 return EINVAL;
979
980 /* check privileged socket */
981 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
982 return EACCES;
983
984 /* allocation new SP entry */
985 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
986 return error;
987
988 newsp->state = IPSEC_SPSTATE_ALIVE;
989
990 /* clear old SP and set new SP */
991 KEY_FREESP(pcb_sp);
992 *pcb_sp = newsp;
993 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
994 kprintf("ipsec_set_policy: new policy\n");
995 kdebug_secpolicy(newsp));
996
997 return 0;
998 }
999
1000 static int
1001 ipsec_get_policy(struct secpolicy *pcb_sp, struct mbuf **mp)
1002 {
1003
1004 /* sanity check. */
1005 if (pcb_sp == NULL || mp == NULL)
1006 return EINVAL;
1007
1008 *mp = key_sp2msg(pcb_sp);
1009 if (!*mp) {
1010 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1011 return ENOBUFS;
1012 }
1013
1014 KKASSERT((*mp)->m_type == MT_DATA);
1015 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1016 kprintf("ipsec_get_policy:\n");
1017 kdebug_mbuf(*mp));
1018
1019 return 0;
1020 }
1021
1022 int
1023 ipsec4_set_policy(struct inpcb *inp, int optname, caddr_t request,
1024 size_t len, int priv)
1025 {
1026 struct sadb_x_policy *xpl;
1027 struct secpolicy **pcb_sp;
1028
1029 /* sanity check. */
1030 if (inp == NULL || request == NULL)
1031 return EINVAL;
1032 if (len < sizeof(*xpl))
1033 return EINVAL;
1034 xpl = (struct sadb_x_policy *)request;
1035
1036 /* select direction */
1037 switch (xpl->sadb_x_policy_dir) {
1038 case IPSEC_DIR_INBOUND:
1039 pcb_sp = &inp->inp_sp->sp_in;
1040 break;
1041 case IPSEC_DIR_OUTBOUND:
1042 pcb_sp = &inp->inp_sp->sp_out;
1043 break;
1044 default:
1045 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1046 xpl->sadb_x_policy_dir));
1047 return EINVAL;
1048 }
1049
1050 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1051 }
1052
1053 int
1054 ipsec4_get_policy(struct inpcb *inp, caddr_t request, size_t len,
1055 struct mbuf **mp)
1056 {
1057 struct sadb_x_policy *xpl;
1058 struct secpolicy *pcb_sp;
1059
1060 /* sanity check. */
1061 if (inp == NULL || request == NULL || mp == NULL)
1062 return EINVAL;
1063 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1064 if (len < sizeof(*xpl))
1065 return EINVAL;
1066 xpl = (struct sadb_x_policy *)request;
1067
1068 /* select direction */
1069 switch (xpl->sadb_x_policy_dir) {
1070 case IPSEC_DIR_INBOUND:
1071 pcb_sp = inp->inp_sp->sp_in;
1072 break;
1073 case IPSEC_DIR_OUTBOUND:
1074 pcb_sp = inp->inp_sp->sp_out;
1075 break;
1076 default:
1077 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1078 xpl->sadb_x_policy_dir));
1079 return EINVAL;
1080 }
1081
1082 return ipsec_get_policy(pcb_sp, mp);
1083 }
1084
1085 /* delete policy in PCB */
1086 int
1087 ipsec4_delete_pcbpolicy(struct inpcb *inp)
1088 {
1089 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1090
1091 if (inp->inp_sp == NULL)
1092 return 0;
1093
1094 if (inp->inp_sp->sp_in != NULL)
1095 KEY_FREESP(&inp->inp_sp->sp_in);
1096
1097 if (inp->inp_sp->sp_out != NULL)
1098 KEY_FREESP(&inp->inp_sp->sp_out);
1099
1100 ipsec_delpcbpolicy(inp->inp_sp);
1101 inp->inp_sp = NULL;
1102
1103 return 0;
1104 }
1105
1106 #ifdef INET6
1107 int
1108 ipsec6_set_policy(struct in6pcb *in6p, int optname, caddr_t request,
1109 size_t len, int priv)
1110 {
1111 struct sadb_x_policy *xpl;
1112 struct secpolicy **pcb_sp;
1113
1114 /* sanity check. */
1115 if (in6p == NULL || request == NULL)
1116 return EINVAL;
1117 if (len < sizeof(*xpl))
1118 return EINVAL;
1119 xpl = (struct sadb_x_policy *)request;
1120
1121 /* select direction */
1122 switch (xpl->sadb_x_policy_dir) {
1123 case IPSEC_DIR_INBOUND:
1124 pcb_sp = &in6p->in6p_sp->sp_in;
1125 break;
1126 case IPSEC_DIR_OUTBOUND:
1127 pcb_sp = &in6p->in6p_sp->sp_out;
1128 break;
1129 default:
1130 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1131 xpl->sadb_x_policy_dir));
1132 return EINVAL;
1133 }
1134
1135 return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1136 }
1137
1138 int
1139 ipsec6_get_policy(struct in6pcb *in6p, caddr_t request, size_t len,
1140 struct mbuf **mp)
1141 {
1142 struct sadb_x_policy *xpl;
1143 struct secpolicy *pcb_sp;
1144
1145 /* sanity check. */
1146 if (in6p == NULL || request == NULL || mp == NULL)
1147 return EINVAL;
1148 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1149 if (len < sizeof(*xpl))
1150 return EINVAL;
1151 xpl = (struct sadb_x_policy *)request;
1152
1153 /* select direction */
1154 switch (xpl->sadb_x_policy_dir) {
1155 case IPSEC_DIR_INBOUND:
1156 pcb_sp = in6p->in6p_sp->sp_in;
1157 break;
1158 case IPSEC_DIR_OUTBOUND:
1159 pcb_sp = in6p->in6p_sp->sp_out;
1160 break;
1161 default:
1162 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1163 xpl->sadb_x_policy_dir));
1164 return EINVAL;
1165 }
1166
1167 return ipsec_get_policy(pcb_sp, mp);
1168 }
1169
1170 int
1171 ipsec6_delete_pcbpolicy(struct in6pcb *in6p)
1172 {
1173 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1174
1175 if (in6p->in6p_sp == NULL)
1176 return 0;
1177
1178 if (in6p->in6p_sp->sp_in != NULL)
1179 KEY_FREESP(&in6p->in6p_sp->sp_in);
1180
1181 if (in6p->in6p_sp->sp_out != NULL)
1182 KEY_FREESP(&in6p->in6p_sp->sp_out);
1183
1184 ipsec_delpcbpolicy(in6p->in6p_sp);
1185 in6p->in6p_sp = NULL;
1186
1187 return 0;
1188 }
1189 #endif
1190
1191 /*
1192 * return current level.
1193 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1194 */
1195 u_int
1196 ipsec_get_reqlevel(struct ipsecrequest *isr)
1197 {
1198 u_int level = 0;
1199 u_int esp_trans_deflev, esp_net_deflev;
1200 u_int ah_trans_deflev, ah_net_deflev;
1201
1202 KASSERT(isr != NULL && isr->sp != NULL,
1203 ("ipsec_get_reqlevel: null argument"));
1204 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1205 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1206 isr->sp->spidx.src.sa.sa_family,
1207 isr->sp->spidx.dst.sa.sa_family));
1208
1209 /* XXX note that we have ipseclog() expanded here - code sync issue */
1210 #define IPSEC_CHECK_DEFAULT(lev) \
1211 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1212 && (lev) != IPSEC_LEVEL_UNIQUE) \
1213 ? (ipsec_debug \
1214 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1215 (lev), IPSEC_LEVEL_REQUIRE) \
1216 : 0), \
1217 (lev) = IPSEC_LEVEL_REQUIRE, \
1218 (lev) \
1219 : (lev))
1220
1221 /* set default level */
1222 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1223 #ifdef INET
1224 case AF_INET:
1225 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1226 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1227 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1228 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1229 break;
1230 #endif
1231 #ifdef INET6
1232 case AF_INET6:
1233 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1234 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1235 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1236 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1237 break;
1238 #endif /* INET6 */
1239 default:
1240 panic("key_get_reqlevel: unknown af %u",
1241 isr->sp->spidx.src.sa.sa_family);
1242 }
1243
1244 #undef IPSEC_CHECK_DEFAULT
1245
1246 /* set level */
1247 switch (isr->level) {
1248 case IPSEC_LEVEL_DEFAULT:
1249 switch (isr->saidx.proto) {
1250 case IPPROTO_ESP:
1251 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1252 level = esp_net_deflev;
1253 else
1254 level = esp_trans_deflev;
1255 break;
1256 case IPPROTO_AH:
1257 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1258 level = ah_net_deflev;
1259 else
1260 level = ah_trans_deflev;
1261 break;
1262 case IPPROTO_IPCOMP:
1263 /*
1264 * we don't really care, as IPcomp document says that
1265 * we shouldn't compress small packets
1266 */
1267 level = IPSEC_LEVEL_USE;
1268 break;
1269 default:
1270 panic("ipsec_get_reqlevel: "
1271 "Illegal protocol defined %u\n",
1272 isr->saidx.proto);
1273 }
1274 break;
1275
1276 case IPSEC_LEVEL_USE:
1277 case IPSEC_LEVEL_REQUIRE:
1278 level = isr->level;
1279 break;
1280 case IPSEC_LEVEL_UNIQUE:
1281 level = IPSEC_LEVEL_REQUIRE;
1282 break;
1283
1284 default:
1285 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n",
1286 isr->level);
1287 }
1288
1289 return level;
1290 }
1291
1292 /*
1293 * Check security policy requirements against the actual
1294 * packet contents. Return one if the packet should be
1295 * reject as "invalid"; otherwiser return zero to have the
1296 * packet treated as "valid".
1297 *
1298 * OUT:
1299 * 0: valid
1300 * 1: invalid
1301 */
1302 int
1303 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1304 {
1305 struct ipsecrequest *isr;
1306 int need_auth;
1307
1308 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1309 kprintf("ipsec_in_reject: using SP\n");
1310 kdebug_secpolicy(sp));
1311
1312 /* check policy */
1313 switch (sp->policy) {
1314 case IPSEC_POLICY_DISCARD:
1315 return 1;
1316 case IPSEC_POLICY_BYPASS:
1317 case IPSEC_POLICY_NONE:
1318 return 0;
1319 }
1320
1321 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1322 ("ipsec_in_reject: invalid policy %u", sp->policy));
1323
1324 /* XXX should compare policy against ipsec header history */
1325
1326 need_auth = 0;
1327 for (isr = sp->req; isr != NULL; isr = isr->next) {
1328 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1329 continue;
1330 switch (isr->saidx.proto) {
1331 case IPPROTO_ESP:
1332 if ((m->m_flags & M_DECRYPTED) == 0) {
1333 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1334 kprintf("ipsec_in_reject: ESP m_flags:%x\n",
1335 m->m_flags));
1336 return 1;
1337 }
1338
1339 if (!need_auth &&
1340 isr->sav != NULL &&
1341 isr->sav->tdb_authalgxform != NULL &&
1342 (m->m_flags & M_AUTHIPDGM) == 0) {
1343 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1344 kprintf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1345 m->m_flags));
1346 return 1;
1347 }
1348 break;
1349 case IPPROTO_AH:
1350 need_auth = 1;
1351 if ((m->m_flags & M_AUTHIPHDR) == 0) {
1352 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1353 kprintf("ipsec_in_reject: AH m_flags:%x\n",
1354 m->m_flags));
1355 return 1;
1356 }
1357 break;
1358 case IPPROTO_IPCOMP:
1359 /*
1360 * we don't really care, as IPcomp document
1361 * says that we shouldn't compress small
1362 * packets, IPComp policy should always be
1363 * treated as being in "use" level.
1364 */
1365 break;
1366 }
1367 }
1368 return 0; /* valid */
1369 }
1370
1371 /*
1372 * Check AH/ESP integrity.
1373 * This function is called from tcp_input(), udp_input(),
1374 * and {ah,esp}4_input for tunnel mode
1375 */
1376 int
1377 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp)
1378 {
1379 struct secpolicy *sp;
1380 int error;
1381 int result;
1382
1383 KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1384
1385 /* get SP for this packet.
1386 * When we are called from ip_forward(), we call
1387 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1388 */
1389 if (inp == NULL)
1390 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1391 else
1392 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error);
1393
1394 if (sp != NULL) {
1395 result = ipsec_in_reject(sp, m);
1396 if (result)
1397 newipsecstat.ips_in_polvio++;
1398 KEY_FREESP(&sp);
1399 } else {
1400 result = 0; /* XXX should be panic ?
1401 * -> No, there may be error. */
1402 }
1403 return result;
1404 }
1405
1406 #ifdef INET6
1407 /*
1408 * Check AH/ESP integrity.
1409 * This function is called from tcp6_input(), udp6_input(),
1410 * and {ah,esp}6_input for tunnel mode
1411 */
1412 int
1413 ipsec6_in_reject(struct mbuf *m, struct inpcb *inp)
1414 {
1415 struct secpolicy *sp = NULL;
1416 int error;
1417 int result;
1418
1419 /* sanity check */
1420 if (m == NULL)
1421 return 0; /* XXX should be panic ? */
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;
1439 }
1440 return result;
1441 }
1442 #endif
1443
1444 /*
1445 * compute the byte size to be occupied by IPsec header.
1446 * in case it is tunneled, it includes the size of outer IP header.
1447 * NOTE: SP passed is free in this function.
1448 */
1449 static size_t
1450 ipsec_hdrsiz(struct secpolicy *sp)
1451 {
1452 struct ipsecrequest *isr;
1453 size_t siz;
1454
1455 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1456 kprintf("ipsec_hdrsiz: using SP\n");
1457 kdebug_secpolicy(sp));
1458
1459 switch (sp->policy) {
1460 case IPSEC_POLICY_DISCARD:
1461 case IPSEC_POLICY_BYPASS:
1462 case IPSEC_POLICY_NONE:
1463 return 0;
1464 }
1465
1466 KASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1467 ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1468
1469 siz = 0;
1470 for (isr = sp->req; isr != NULL; isr = isr->next) {
1471 size_t clen = 0;
1472
1473 switch (isr->saidx.proto) {
1474 case IPPROTO_ESP:
1475 clen = esp_hdrsiz(isr->sav);
1476 break;
1477 case IPPROTO_AH:
1478 clen = ah_hdrsiz(isr->sav);
1479 break;
1480 case IPPROTO_IPCOMP:
1481 clen = sizeof(struct ipcomp);
1482 break;
1483 }
1484
1485 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1486 switch (isr->saidx.dst.sa.sa_family) {
1487 case AF_INET:
1488 clen += sizeof(struct ip);
1489 break;
1490 #ifdef INET6
1491 case AF_INET6:
1492 clen += sizeof(struct ip6_hdr);
1493 break;
1494 #endif
1495 default:
1496 ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1497 "unknown AF %d in IPsec tunnel SA\n",
1498 ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1499 break;
1500 }
1501 }
1502 siz += clen;
1503 }
1504
1505 return siz;
1506 }
1507
1508 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1509 size_t
1510 ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp)
1511 {
1512 struct secpolicy *sp;
1513 int error;
1514 size_t size;
1515
1516 KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1517 KASSERT(inp == NULL || inp->inp_socket != NULL,
1518 ("ipsec4_hdrsize: socket w/o inpcb"));
1519
1520 /* get SP for this packet.
1521 * When we are called from ip_forward(), we call
1522 * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1523 */
1524 if (inp == NULL)
1525 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1526 else
1527 sp = ipsec_getpolicybysock(m, dir, inp, &error);
1528
1529 if (sp != NULL) {
1530 size = ipsec_hdrsiz(sp);
1531 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1532 kprintf("ipsec4_hdrsiz: size:%lu.\n",
1533 (unsigned long)size));
1534
1535 KEY_FREESP(&sp);
1536 } else {
1537 size = 0; /* XXX should be panic ? */
1538 }
1539 return size;
1540 }
1541
1542 #ifdef INET6
1543 /* This function is called from ipsec6_hdrsize_tcp(),
1544 * and maybe from ip6_forward.()
1545 */
1546 size_t
1547 ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p)
1548 {
1549 struct secpolicy *sp;
1550 int error;
1551 size_t size;
1552
1553 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1554 KASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1555 ("ipsec6_hdrsize: socket w/o inpcb"));
1556
1557 /* get SP for this packet */
1558 /* XXX Is it right to call with IP_FORWARDING. */
1559 if (in6p == NULL)
1560 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1561 else
1562 sp = ipsec_getpolicybysock(m, dir, in6p, &error);
1563
1564 if (sp == NULL)
1565 return 0;
1566 size = ipsec_hdrsiz(sp);
1567 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1568 kprintf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1569 KEY_FREESP(&sp);
1570
1571 return size;
1572 }
1573 #endif /*INET6*/
1574
1575 /*
1576 * Check the variable replay window.
1577 * ipsec_chkreplay() performs replay check before ICV verification.
1578 * ipsec_updatereplay() updates replay bitmap. This must be called after
1579 * ICV verification (it also performs replay check, which is usually done
1580 * beforehand).
1581 * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1582 *
1583 * based on RFC 2401.
1584 */
1585 int
1586 ipsec_chkreplay(u_int32_t seq, struct secasvar *sav)
1587 {
1588 const struct secreplay *replay;
1589 u_int32_t diff;
1590 int fr;
1591 u_int32_t wsizeb; /* constant: bits of window size */
1592 int frlast; /* constant: last frame */
1593
1594 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1595 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1596
1597 replay = sav->replay;
1598
1599 if (replay->wsize == 0)
1600 return 1; /* no need to check replay. */
1601
1602 /* constant */
1603 frlast = replay->wsize - 1;
1604 wsizeb = replay->wsize << 3;
1605
1606 /* sequence number of 0 is invalid */
1607 if (seq == 0)
1608 return 0;
1609
1610 /* first time is always okay */
1611 if (replay->count == 0)
1612 return 1;
1613
1614 if (seq > replay->lastseq) {
1615 /* larger sequences are okay */
1616 return 1;
1617 } else {
1618 /* seq is equal or less than lastseq. */
1619 diff = replay->lastseq - seq;
1620
1621 /* over range to check, i.e. too old or wrapped */
1622 if (diff >= wsizeb)
1623 return 0;
1624
1625 fr = frlast - diff / 8;
1626
1627 /* this packet already seen ? */
1628 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1629 return 0;
1630
1631 /* out of order but good */
1632 return 1;
1633 }
1634 }
1635
1636 /*
1637 * check replay counter whether to update or not.
1638 * OUT: 0: OK
1639 * 1: NG
1640 */
1641 int
1642 ipsec_updatereplay(u_int32_t seq, struct secasvar *sav)
1643 {
1644 struct secreplay *replay;
1645 u_int32_t diff;
1646 int fr;
1647 u_int32_t wsizeb; /* constant: bits of window size */
1648 int frlast; /* constant: last frame */
1649
1650 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
1651 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
1652
1653 replay = sav->replay;
1654
1655 if (replay->wsize == 0)
1656 goto ok; /* no need to check replay. */
1657
1658 /* constant */
1659 frlast = replay->wsize - 1;
1660 wsizeb = replay->wsize << 3;
1661
1662 /* sequence number of 0 is invalid */
1663 if (seq == 0)
1664 return 1;
1665
1666 /* first time */
1667 if (replay->count == 0) {
1668 replay->lastseq = seq;
1669 bzero(replay->bitmap, replay->wsize);
1670 (replay->bitmap)[frlast] = 1;
1671 goto ok;
1672 }
1673
1674 if (seq > replay->lastseq) {
1675 /* seq is larger than lastseq. */
1676 diff = seq - replay->lastseq;
1677
1678 /* new larger sequence number */
1679 if (diff < wsizeb) {
1680 /* In window */
1681 /* set bit for this packet */
1682 vshiftl(replay->bitmap, diff, replay->wsize);
1683 (replay->bitmap)[frlast] |= 1;
1684 } else {
1685 /* this packet has a "way larger" */
1686 bzero(replay->bitmap, replay->wsize);
1687 (replay->bitmap)[frlast] = 1;
1688 }
1689 replay->lastseq = seq;
1690
1691 /* larger is good */
1692 } else {
1693 /* seq is equal or less than lastseq. */
1694 diff = replay->lastseq - seq;
1695
1696 /* over range to check, i.e. too old or wrapped */
1697 if (diff >= wsizeb)
1698 return 1;
1699
1700 fr = frlast - diff / 8;
1701
1702 /* this packet already seen ? */
1703 if ((replay->bitmap)[fr] & (1 << (diff % 8)))
1704 return 1;
1705
1706 /* mark as seen */
1707 (replay->bitmap)[fr] |= (1 << (diff % 8));
1708
1709 /* out of order but good */
1710 }
1711
1712 ok:
1713 if (replay->count == ~0) {
1714
1715 /* set overflow flag */
1716 replay->overflow++;
1717
1718 /* don't increment, no more packets accepted */
1719 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
1720 return 1;
1721
1722 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
1723 replay->overflow, ipsec_logsastr(sav)));
1724 }
1725
1726 replay->count++;
1727
1728 return 0;
1729 }
1730
1731 /*
1732 * shift variable length buffer to left.
1733 * IN: bitmap: pointer to the buffer
1734 * nbit: the number of to shift.
1735 * wsize: buffer size (bytes).
1736 */
1737 static void
1738 vshiftl(unsigned char *bitmap, int nbit, int wsize)
1739 {
1740 int s, j, i;
1741 unsigned char over;
1742
1743 for (j = 0; j < nbit; j += 8) {
1744 s = (nbit - j < 8) ? (nbit - j): 8;
1745 bitmap[0] <<= s;
1746 for (i = 1; i < wsize; i++) {
1747 over = (bitmap[i] >> (8 - s));
1748 bitmap[i] <<= s;
1749 bitmap[i-1] |= over;
1750 }
1751 }
1752
1753 return;
1754 }
1755
1756 /* Return a printable string for the address. */
1757 char *
1758 ipsec_address(union sockaddr_union* sa)
1759 {
1760 switch (sa->sa.sa_family) {
1761 #if INET
1762 case AF_INET:
1763 return inet_ntoa(sa->sin.sin_addr);
1764 #endif /* INET */
1765
1766 #if INET6
1767 case AF_INET6:
1768 return ip6_sprintf(&sa->sin6.sin6_addr);
1769 #endif /* INET6 */
1770
1771 default:
1772 return "(unknown address family)";
1773 }
1774 }
1775
1776 const char *
1777 ipsec_logsastr(struct secasvar *sav)
1778 {
1779 static char buf[256];
1780 char *p;
1781 struct secasindex *saidx = &sav->sah->saidx;
1782
1783 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
1784 ("ipsec_logsastr: address family mismatch"));
1785
1786 p = buf;
1787 ksnprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
1788 while (p && *p)
1789 p++;
1790 /* NB: only use ipsec_address on one address at a time */
1791 ksnprintf(p, sizeof (buf) - (p - buf), "src=%s ",
1792 ipsec_address(&saidx->src));
1793 while (p && *p)
1794 p++;
1795 ksnprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
1796 ipsec_address(&saidx->dst));
1797
1798 return buf;
1799 }
1800
1801 void
1802 ipsec_dumpmbuf(struct mbuf *m)
1803 {
1804 int totlen;
1805 int i;
1806 u_char *p;
1807
1808 totlen = 0;
1809 kprintf("---\n");
1810 while (m) {
1811 p = mtod(m, u_char *);
1812 for (i = 0; i < m->m_len; i++) {
1813 kprintf("%02x ", p[i]);
1814 totlen++;
1815 if (totlen % 16 == 0)
1816 kprintf("\n");
1817 }
1818 m = m->m_next;
1819 }
1820 if (totlen % 16 != 0)
1821 kprintf("\n");
1822 kprintf("---\n");
1823 }
1824
1825 /* XXX this stuff doesn't belong here... */
1826
1827 static struct xformsw* xforms = NULL;
1828
1829 /*
1830 * Register a transform; typically at system startup.
1831 */
1832 void
1833 xform_register(struct xformsw* xsp)
1834 {
1835 xsp->xf_next = xforms;
1836 xforms = xsp;
1837 }
1838
1839 /*
1840 * Initialize transform support in an sav.
1841 */
1842 int
1843 xform_init(struct secasvar *sav, int xftype)
1844 {
1845 struct xformsw *xsp;
1846
1847 if (sav->tdb_xform != NULL) /* previously initialized */
1848 return 0;
1849 for (xsp = xforms; xsp; xsp = xsp->xf_next)
1850 if (xsp->xf_type == xftype)
1851 return (*xsp->xf_init)(sav, xsp);
1852 return EINVAL;
1853 }
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