FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec.c
1 /* $FreeBSD: src/sys/netipsec/ipsec.c,v 1.36 2008/11/27 10:43:08 bz Exp $ */
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/priv.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/vimage.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 <sys/types.h>
81 #include <netipsec/ipsec.h>
82 #ifdef INET6
83 #include <netipsec/ipsec6.h>
84 #endif
85 #include <netipsec/ah_var.h>
86 #include <netipsec/esp_var.h>
87 #include <netipsec/ipcomp.h> /*XXX*/
88 #include <netipsec/ipcomp_var.h>
89
90 #include <netipsec/key.h>
91 #include <netipsec/keydb.h>
92 #include <netipsec/key_debug.h>
93
94 #include <netipsec/xform.h>
95
96 #include <machine/in_cksum.h>
97
98 #include <opencrypto/cryptodev.h>
99
100 #ifdef VIMAGE_GLOBALS
101 /* NB: name changed so netstat doesn't use it */
102 struct ipsecstat ipsec4stat;
103 struct secpolicy ip4_def_policy;
104 int ipsec_debug;
105 int ip4_ah_offsetmask;
106 int ip4_ipsec_dfbit;
107 int ip4_esp_trans_deflev;
108 int ip4_esp_net_deflev;
109 int ip4_ah_trans_deflev;
110 int ip4_ah_net_deflev;
111 int ip4_ipsec_ecn;
112 int ip4_esp_randpad;
113 /*
114 * Crypto support requirements:
115 *
116 * 1 require hardware support
117 * -1 require software support
118 * 0 take anything
119 */
120 int crypto_support;
121 #endif /* VIMAGE_GLOBALS */
122
123 SYSCTL_DECL(_net_inet_ipsec);
124
125 /* net.inet.ipsec */
126 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_POLICY,
127 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0,
128 "IPsec default policy.");
129 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV,
130 esp_trans_deflev, CTLFLAG_RW, ip4_esp_trans_deflev, 0,
131 "Default ESP transport mode level");
132 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV,
133 esp_net_deflev, CTLFLAG_RW, ip4_esp_net_deflev, 0,
134 "Default ESP tunnel mode level.");
135 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV,
136 ah_trans_deflev, CTLFLAG_RW, ip4_ah_trans_deflev, 0,
137 "AH transfer mode default level.");
138 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV,
139 ah_net_deflev, CTLFLAG_RW, ip4_ah_net_deflev, 0,
140 "AH tunnel mode default level.");
141 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
142 ah_cleartos, CTLFLAG_RW, ah_cleartos, 0,
143 "If set clear type-of-service field when doing AH computation.");
144 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
145 ah_offsetmask, CTLFLAG_RW, ip4_ah_offsetmask, 0,
146 "If not set clear offset field mask when doing AH computation.");
147 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DFBIT,
148 dfbit, CTLFLAG_RW, ip4_ipsec_dfbit, 0,
149 "Do not fragment bit on encap.");
150 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_ECN,
151 ecn, CTLFLAG_RW, ip4_ipsec_ecn, 0,
152 "Explicit Congestion Notification handling.");
153 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEBUG,
154 debug, CTLFLAG_RW, ipsec_debug, 0,
155 "Enable IPsec debugging output when set.");
156 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO,
157 crypto_support, CTLFLAG_RW, crypto_support,0,
158 "Crypto driver selection.");
159 SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO,
160 ipsecstats, CTLFLAG_RD, ipsec4stat, ipsecstat,
161 "IPsec IPv4 statistics.");
162
163 #ifdef REGRESSION
164 #ifdef VIMAGE_GLOBALS
165 int ipsec_replay;
166 int ipsec_integrity;
167 #endif
168 /*
169 * When set to 1, IPsec will send packets with the same sequence number.
170 * This allows to verify if the other side has proper replay attacks detection.
171 */
172 SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_replay,
173 CTLFLAG_RW, ipsec_replay, 0, "Emulate replay attack");
174 /*
175 * When set 1, IPsec will send packets with corrupted HMAC.
176 * This allows to verify if the other side properly detects modified packets.
177 */
178 SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_integrity,
179 CTLFLAG_RW, ipsec_integrity, 0, "Emulate man-in-the-middle attack");
180 #endif
181
182 #ifdef INET6
183 #ifdef VIMAGE_GLOBALS
184 struct ipsecstat ipsec6stat;
185 int ip6_esp_trans_deflev;
186 int ip6_esp_net_deflev;
187 int ip6_ah_trans_deflev;
188 int ip6_ah_net_deflev;
189 int ip6_ipsec_ecn;
190 #endif
191
192 SYSCTL_DECL(_net_inet6_ipsec6);
193
194 /* net.inet6.ipsec6 */
195 #ifdef COMPAT_KAME
196 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
197 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics.");
198 #endif /* COMPAT_KAME */
199 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
200 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0,
201 "IPsec default policy.");
202 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV,
203 esp_trans_deflev, CTLFLAG_RW, ip6_esp_trans_deflev, 0,
204 "Default ESP transport mode level.");
205 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV,
206 esp_net_deflev, CTLFLAG_RW, ip6_esp_net_deflev, 0,
207 "Default ESP tunnel mode level.");
208 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV,
209 ah_trans_deflev, CTLFLAG_RW, ip6_ah_trans_deflev, 0,
210 "AH transfer mode default level.");
211 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV,
212 ah_net_deflev, CTLFLAG_RW, ip6_ah_net_deflev, 0,
213 "AH tunnel mode default level.");
214 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_ECN,
215 ecn, CTLFLAG_RW, ip6_ipsec_ecn, 0,
216 "Explicit Congestion Notification handling.");
217 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEBUG,
218 debug, CTLFLAG_RW, ipsec_debug, 0,
219 "Enable IPsec debugging output when set.");
220 SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_STATS,
221 ipsecstats, CTLFLAG_RD, ipsec6stat, ipsecstat,
222 "IPsec IPv6 statistics.");
223 #endif /* INET6 */
224
225 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
226 #ifdef INET6
227 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
228 #endif
229 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
230 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
231 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
232 #ifdef INET6
233 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
234 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
235 #endif
236 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
237 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
238 static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
239 int optname, caddr_t request, size_t len, struct ucred *cred));
240 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
241 static void vshiftl __P((unsigned char *, int, int));
242 static size_t ipsec_hdrsiz __P((struct secpolicy *));
243
244 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
245
246 void
247 ipsec_init(void)
248 {
249 INIT_VNET_IPSEC(curvnet);
250
251 #ifdef IPSEC_DEBUG
252 V_ipsec_debug = 1;
253 #else
254 V_ipsec_debug = 0;
255 #endif
256
257 V_ip4_ah_offsetmask = 0; /* maybe IP_DF? */
258 V_ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */
259 V_ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
260 V_ip4_esp_net_deflev = IPSEC_LEVEL_USE;
261 V_ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
262 V_ip4_ah_net_deflev = IPSEC_LEVEL_USE;
263 V_ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
264 V_ip4_esp_randpad = -1;
265
266 V_crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE;
267
268 #ifdef REGRESSION
269 V_ipsec_replay = 0;
270 V_ipsec_integrity = 0;
271 #endif
272
273 #ifdef INET6
274 V_ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
275 V_ip6_esp_net_deflev = IPSEC_LEVEL_USE;
276 V_ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
277 V_ip6_ah_net_deflev = IPSEC_LEVEL_USE;
278 V_ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
279 #endif
280 }
281
282 /*
283 * Return a held reference to the default SP.
284 */
285 static struct secpolicy *
286 key_allocsp_default(const char* where, int tag)
287 {
288 INIT_VNET_IPSEC(curvnet);
289 struct secpolicy *sp;
290
291 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
292 printf("DP key_allocsp_default from %s:%u\n", where, tag));
293
294 sp = &V_ip4_def_policy;
295 if (sp->policy != IPSEC_POLICY_DISCARD &&
296 sp->policy != IPSEC_POLICY_NONE) {
297 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
298 sp->policy, IPSEC_POLICY_NONE));
299 sp->policy = IPSEC_POLICY_NONE;
300 }
301 key_addref(sp);
302
303 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
304 printf("DP key_allocsp_default returns SP:%p (%u)\n",
305 sp, sp->refcnt));
306 return sp;
307 }
308 #define KEY_ALLOCSP_DEFAULT() \
309 key_allocsp_default(__FILE__, __LINE__)
310
311 /*
312 * For OUTBOUND packet having a socket. Searching SPD for packet,
313 * and return a pointer to SP.
314 * OUT: NULL: no apropreate SP found, the following value is set to error.
315 * 0 : bypass
316 * EACCES : discard packet.
317 * ENOENT : ipsec_acquire() in progress, maybe.
318 * others : error occured.
319 * others: a pointer to SP
320 *
321 * NOTE: IPv6 mapped adddress concern is implemented here.
322 */
323 struct secpolicy *
324 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
325 {
326 struct secpolicy *sp;
327
328 IPSEC_ASSERT(tdbi != NULL, ("null tdbi"));
329 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
330 ("invalid direction %u", dir));
331
332 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
333 if (sp == NULL) /*XXX????*/
334 sp = KEY_ALLOCSP_DEFAULT();
335 IPSEC_ASSERT(sp != NULL, ("null SP"));
336 return sp;
337 }
338
339 /*
340 * For OUTBOUND packet having a socket. Searching SPD for packet,
341 * and return a pointer to SP.
342 * OUT: NULL: no apropreate SP found, the following value is set to error.
343 * 0 : bypass
344 * EACCES : discard packet.
345 * ENOENT : ipsec_acquire() in progress, maybe.
346 * others : error occured.
347 * others: a pointer to SP
348 *
349 * NOTE: IPv6 mapped adddress concern is implemented here.
350 */
351 struct secpolicy *
352 ipsec_getpolicybysock(m, dir, inp, error)
353 struct mbuf *m;
354 u_int dir;
355 struct inpcb *inp;
356 int *error;
357 {
358 INIT_VNET_IPSEC(curvnet);
359 struct inpcbpolicy *pcbsp = NULL;
360 struct secpolicy *currsp = NULL; /* policy on socket */
361 struct secpolicy *sp;
362
363 IPSEC_ASSERT(m != NULL, ("null mbuf"));
364 IPSEC_ASSERT(inp != NULL, ("null inpcb"));
365 IPSEC_ASSERT(error != NULL, ("null error"));
366 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
367 ("invalid direction %u", dir));
368
369 /* set spidx in pcb */
370 if (inp->inp_vflag & INP_IPV6PROTO) {
371 #ifdef INET6
372 *error = ipsec6_setspidx_in6pcb(m, inp);
373 pcbsp = inp->in6p_sp;
374 #else
375 *error = EINVAL; /* should not happen */
376 #endif
377 } else {
378 *error = ipsec4_setspidx_inpcb(m, inp);
379 pcbsp = inp->inp_sp;
380 }
381 if (*error)
382 return NULL;
383
384 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp"));
385 switch (dir) {
386 case IPSEC_DIR_INBOUND:
387 currsp = pcbsp->sp_in;
388 break;
389 case IPSEC_DIR_OUTBOUND:
390 currsp = pcbsp->sp_out;
391 break;
392 }
393 IPSEC_ASSERT(currsp != NULL, ("null currsp"));
394
395 if (pcbsp->priv) { /* when privilieged socket */
396 switch (currsp->policy) {
397 case IPSEC_POLICY_BYPASS:
398 case IPSEC_POLICY_IPSEC:
399 key_addref(currsp);
400 sp = currsp;
401 break;
402
403 case IPSEC_POLICY_ENTRUST:
404 /* look for a policy in SPD */
405 sp = KEY_ALLOCSP(&currsp->spidx, dir);
406 if (sp == NULL) /* no SP found */
407 sp = KEY_ALLOCSP_DEFAULT();
408 break;
409
410 default:
411 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n",
412 __func__, currsp->policy));
413 *error = EINVAL;
414 return NULL;
415 }
416 } else { /* unpriv, SPD has policy */
417 sp = KEY_ALLOCSP(&currsp->spidx, dir);
418 if (sp == NULL) { /* no SP found */
419 switch (currsp->policy) {
420 case IPSEC_POLICY_BYPASS:
421 ipseclog((LOG_ERR, "%s: Illegal policy for "
422 "non-priviliged defined %d\n",
423 __func__, currsp->policy));
424 *error = EINVAL;
425 return NULL;
426
427 case IPSEC_POLICY_ENTRUST:
428 sp = KEY_ALLOCSP_DEFAULT();
429 break;
430
431 case IPSEC_POLICY_IPSEC:
432 key_addref(currsp);
433 sp = currsp;
434 break;
435
436 default:
437 ipseclog((LOG_ERR, "%s: Invalid policy for "
438 "PCB %d\n", __func__, currsp->policy));
439 *error = EINVAL;
440 return NULL;
441 }
442 }
443 }
444 IPSEC_ASSERT(sp != NULL,
445 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy));
446 KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
447 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n",
448 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt));
449 return sp;
450 }
451
452 /*
453 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
454 * and return a pointer to SP.
455 * OUT: positive: a pointer to the entry for security policy leaf matched.
456 * NULL: no apropreate SP found, the following value is set to error.
457 * 0 : bypass
458 * EACCES : discard packet.
459 * ENOENT : ipsec_acquire() in progress, maybe.
460 * others : error occured.
461 */
462 struct secpolicy *
463 ipsec_getpolicybyaddr(m, dir, flag, error)
464 struct mbuf *m;
465 u_int dir;
466 int flag;
467 int *error;
468 {
469 INIT_VNET_IPSEC(curvnet);
470 struct secpolicyindex spidx;
471 struct secpolicy *sp;
472
473 IPSEC_ASSERT(m != NULL, ("null mbuf"));
474 IPSEC_ASSERT(error != NULL, ("null error"));
475 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
476 ("invalid direction %u", dir));
477
478 sp = NULL;
479 if (key_havesp(dir)) {
480 /* Make an index to look for a policy. */
481 *error = ipsec_setspidx(m, &spidx,
482 (flag & IP_FORWARDING) ? 0 : 1);
483 if (*error != 0) {
484 DPRINTF(("%s: setpidx failed, dir %u flag %u\n",
485 __func__, dir, flag));
486 return NULL;
487 }
488 spidx.dir = dir;
489
490 sp = KEY_ALLOCSP(&spidx, dir);
491 }
492 if (sp == NULL) /* no SP found, use system default */
493 sp = KEY_ALLOCSP_DEFAULT();
494 IPSEC_ASSERT(sp != NULL, ("null SP"));
495 return sp;
496 }
497
498 struct secpolicy *
499 ipsec4_checkpolicy(m, dir, flag, error, inp)
500 struct mbuf *m;
501 u_int dir, flag;
502 int *error;
503 struct inpcb *inp;
504 {
505 INIT_VNET_IPSEC(curvnet);
506 struct secpolicy *sp;
507
508 *error = 0;
509 if (inp == NULL)
510 sp = ipsec_getpolicybyaddr(m, dir, flag, error);
511 else
512 sp = ipsec_getpolicybysock(m, dir, inp, error);
513 if (sp == NULL) {
514 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error"));
515 V_ipsec4stat.ips_out_inval++;
516 return NULL;
517 }
518 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error));
519 switch (sp->policy) {
520 case IPSEC_POLICY_ENTRUST:
521 default:
522 printf("%s: invalid policy %u\n", __func__, sp->policy);
523 /* fall thru... */
524 case IPSEC_POLICY_DISCARD:
525 V_ipsec4stat.ips_out_polvio++;
526 *error = -EINVAL; /* packet is discarded by caller */
527 break;
528 case IPSEC_POLICY_BYPASS:
529 case IPSEC_POLICY_NONE:
530 KEY_FREESP(&sp);
531 sp = NULL; /* NB: force NULL result */
532 break;
533 case IPSEC_POLICY_IPSEC:
534 if (sp->req == NULL) /* acquire an SA */
535 *error = key_spdacquire(sp);
536 break;
537 }
538 if (*error != 0) {
539 KEY_FREESP(&sp);
540 sp = NULL;
541 }
542 return sp;
543 }
544
545 static int
546 ipsec4_setspidx_inpcb(m, pcb)
547 struct mbuf *m;
548 struct inpcb *pcb;
549 {
550 int error;
551
552 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
553 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp"));
554 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
555 ("null sp_in || sp_out"));
556
557 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
558 if (error == 0) {
559 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
560 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
561 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
562 } else {
563 bzero(&pcb->inp_sp->sp_in->spidx,
564 sizeof (pcb->inp_sp->sp_in->spidx));
565 bzero(&pcb->inp_sp->sp_out->spidx,
566 sizeof (pcb->inp_sp->sp_in->spidx));
567 }
568 return error;
569 }
570
571 #ifdef INET6
572 static int
573 ipsec6_setspidx_in6pcb(m, pcb)
574 struct mbuf *m;
575 struct in6pcb *pcb;
576 {
577 //INIT_VNET_IPSEC(curvnet);
578 struct secpolicyindex *spidx;
579 int error;
580
581 IPSEC_ASSERT(pcb != NULL, ("null pcb"));
582 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp"));
583 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
584 ("null sp_in || sp_out"));
585
586 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
587 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
588
589 spidx = &pcb->in6p_sp->sp_in->spidx;
590 error = ipsec_setspidx(m, spidx, 1);
591 if (error)
592 goto bad;
593 spidx->dir = IPSEC_DIR_INBOUND;
594
595 spidx = &pcb->in6p_sp->sp_out->spidx;
596 error = ipsec_setspidx(m, spidx, 1);
597 if (error)
598 goto bad;
599 spidx->dir = IPSEC_DIR_OUTBOUND;
600
601 return 0;
602
603 bad:
604 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
605 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
606 return error;
607 }
608 #endif
609
610 /*
611 * configure security policy index (src/dst/proto/sport/dport)
612 * by looking at the content of mbuf.
613 * the caller is responsible for error recovery (like clearing up spidx).
614 */
615 static int
616 ipsec_setspidx(m, spidx, needport)
617 struct mbuf *m;
618 struct secpolicyindex *spidx;
619 int needport;
620 {
621 INIT_VNET_IPSEC(curvnet);
622 struct ip *ip = NULL;
623 struct ip ipbuf;
624 u_int v;
625 struct mbuf *n;
626 int len;
627 int error;
628
629 IPSEC_ASSERT(m != NULL, ("null mbuf"));
630
631 /*
632 * validate m->m_pkthdr.len. we see incorrect length if we
633 * mistakenly call this function with inconsistent mbuf chain
634 * (like 4.4BSD tcp/udp processing). XXX should we panic here?
635 */
636 len = 0;
637 for (n = m; n; n = n->m_next)
638 len += n->m_len;
639 if (m->m_pkthdr.len != len) {
640 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
641 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n",
642 __func__, len, m->m_pkthdr.len));
643 return EINVAL;
644 }
645
646 if (m->m_pkthdr.len < sizeof(struct ip)) {
647 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
648 printf("%s: pkthdr len(%d) too small (v4), ignored.\n",
649 __func__, m->m_pkthdr.len));
650 return EINVAL;
651 }
652
653 if (m->m_len >= sizeof(*ip))
654 ip = mtod(m, struct ip *);
655 else {
656 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf);
657 ip = &ipbuf;
658 }
659 #ifdef _IP_VHL
660 v = _IP_VHL_V(ip->ip_vhl);
661 #else
662 v = ip->ip_v;
663 #endif
664 switch (v) {
665 case 4:
666 error = ipsec4_setspidx_ipaddr(m, spidx);
667 if (error)
668 return error;
669 ipsec4_get_ulp(m, spidx, needport);
670 return 0;
671 #ifdef INET6
672 case 6:
673 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
674 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
675 printf("%s: pkthdr len(%d) too small (v6), "
676 "ignored\n", __func__, m->m_pkthdr.len));
677 return EINVAL;
678 }
679 error = ipsec6_setspidx_ipaddr(m, spidx);
680 if (error)
681 return error;
682 ipsec6_get_ulp(m, spidx, needport);
683 return 0;
684 #endif
685 default:
686 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
687 printf("%s: " "unknown IP version %u, ignored.\n",
688 __func__, v));
689 return EINVAL;
690 }
691 }
692
693 static void
694 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
695 {
696 u_int8_t nxt;
697 int off;
698
699 /* sanity check */
700 IPSEC_ASSERT(m != NULL, ("null mbuf"));
701 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short"));
702
703 /* NB: ip_input() flips it into host endian XXX need more checking */
704 if (m->m_len < sizeof (struct ip)) {
705 struct ip *ip = mtod(m, struct ip *);
706 if (ip->ip_off & (IP_MF | IP_OFFMASK))
707 goto done;
708 #ifdef _IP_VHL
709 off = _IP_VHL_HL(ip->ip_vhl) << 2;
710 #else
711 off = ip->ip_hl << 2;
712 #endif
713 nxt = ip->ip_p;
714 } else {
715 struct ip ih;
716
717 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih);
718 if (ih.ip_off & (IP_MF | IP_OFFMASK))
719 goto done;
720 #ifdef _IP_VHL
721 off = _IP_VHL_HL(ih.ip_vhl) << 2;
722 #else
723 off = ih.ip_hl << 2;
724 #endif
725 nxt = ih.ip_p;
726 }
727
728 while (off < m->m_pkthdr.len) {
729 struct ip6_ext ip6e;
730 struct tcphdr th;
731 struct udphdr uh;
732
733 switch (nxt) {
734 case IPPROTO_TCP:
735 spidx->ul_proto = nxt;
736 if (!needport)
737 goto done_proto;
738 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
739 goto done;
740 m_copydata(m, off, sizeof (th), (caddr_t) &th);
741 spidx->src.sin.sin_port = th.th_sport;
742 spidx->dst.sin.sin_port = th.th_dport;
743 return;
744 case IPPROTO_UDP:
745 spidx->ul_proto = nxt;
746 if (!needport)
747 goto done_proto;
748 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
749 goto done;
750 m_copydata(m, off, sizeof (uh), (caddr_t) &uh);
751 spidx->src.sin.sin_port = uh.uh_sport;
752 spidx->dst.sin.sin_port = uh.uh_dport;
753 return;
754 case IPPROTO_AH:
755 if (off + sizeof(ip6e) > m->m_pkthdr.len)
756 goto done;
757 /* XXX sigh, this works but is totally bogus */
758 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e);
759 off += (ip6e.ip6e_len + 2) << 2;
760 nxt = ip6e.ip6e_nxt;
761 break;
762 case IPPROTO_ICMP:
763 default:
764 /* XXX intermediate headers??? */
765 spidx->ul_proto = nxt;
766 goto done_proto;
767 }
768 }
769 done:
770 spidx->ul_proto = IPSEC_ULPROTO_ANY;
771 done_proto:
772 spidx->src.sin.sin_port = IPSEC_PORT_ANY;
773 spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
774 }
775
776 /* assumes that m is sane */
777 static int
778 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
779 {
780 static const struct sockaddr_in template = {
781 sizeof (struct sockaddr_in),
782 AF_INET,
783 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
784 };
785
786 spidx->src.sin = template;
787 spidx->dst.sin = template;
788
789 if (m->m_len < sizeof (struct ip)) {
790 m_copydata(m, offsetof(struct ip, ip_src),
791 sizeof (struct in_addr),
792 (caddr_t) &spidx->src.sin.sin_addr);
793 m_copydata(m, offsetof(struct ip, ip_dst),
794 sizeof (struct in_addr),
795 (caddr_t) &spidx->dst.sin.sin_addr);
796 } else {
797 struct ip *ip = mtod(m, struct ip *);
798 spidx->src.sin.sin_addr = ip->ip_src;
799 spidx->dst.sin.sin_addr = ip->ip_dst;
800 }
801
802 spidx->prefs = sizeof(struct in_addr) << 3;
803 spidx->prefd = sizeof(struct in_addr) << 3;
804
805 return 0;
806 }
807
808 #ifdef INET6
809 static void
810 ipsec6_get_ulp(m, spidx, needport)
811 struct mbuf *m;
812 struct secpolicyindex *spidx;
813 int needport;
814 {
815 INIT_VNET_IPSEC(curvnet);
816 int off, nxt;
817 struct tcphdr th;
818 struct udphdr uh;
819 struct icmp6_hdr ih;
820
821 /* sanity check */
822 if (m == NULL)
823 panic("%s: NULL pointer was passed.\n", __func__);
824
825 KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
826 printf("%s:\n", __func__); kdebug_mbuf(m));
827
828 /* set default */
829 spidx->ul_proto = IPSEC_ULPROTO_ANY;
830 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
831 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
832
833 nxt = -1;
834 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
835 if (off < 0 || m->m_pkthdr.len < off)
836 return;
837
838 switch (nxt) {
839 case IPPROTO_TCP:
840 spidx->ul_proto = nxt;
841 if (!needport)
842 break;
843 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
844 break;
845 m_copydata(m, off, sizeof(th), (caddr_t)&th);
846 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
847 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
848 break;
849 case IPPROTO_UDP:
850 spidx->ul_proto = nxt;
851 if (!needport)
852 break;
853 if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
854 break;
855 m_copydata(m, off, sizeof(uh), (caddr_t)&uh);
856 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
857 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
858 break;
859 case IPPROTO_ICMPV6:
860 spidx->ul_proto = nxt;
861 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len)
862 break;
863 m_copydata(m, off, sizeof(ih), (caddr_t)&ih);
864 ((struct sockaddr_in6 *)&spidx->src)->sin6_port =
865 htons((uint16_t)ih.icmp6_type);
866 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port =
867 htons((uint16_t)ih.icmp6_code);
868 break;
869 default:
870 /* XXX intermediate headers??? */
871 spidx->ul_proto = nxt;
872 break;
873 }
874 }
875
876 /* assumes that m is sane */
877 static int
878 ipsec6_setspidx_ipaddr(m, spidx)
879 struct mbuf *m;
880 struct secpolicyindex *spidx;
881 {
882 struct ip6_hdr *ip6 = NULL;
883 struct ip6_hdr ip6buf;
884 struct sockaddr_in6 *sin6;
885
886 if (m->m_len >= sizeof(*ip6))
887 ip6 = mtod(m, struct ip6_hdr *);
888 else {
889 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf);
890 ip6 = &ip6buf;
891 }
892
893 sin6 = (struct sockaddr_in6 *)&spidx->src;
894 bzero(sin6, sizeof(*sin6));
895 sin6->sin6_family = AF_INET6;
896 sin6->sin6_len = sizeof(struct sockaddr_in6);
897 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
898 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
899 sin6->sin6_addr.s6_addr16[1] = 0;
900 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
901 }
902 spidx->prefs = sizeof(struct in6_addr) << 3;
903
904 sin6 = (struct sockaddr_in6 *)&spidx->dst;
905 bzero(sin6, sizeof(*sin6));
906 sin6->sin6_family = AF_INET6;
907 sin6->sin6_len = sizeof(struct sockaddr_in6);
908 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
909 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
910 sin6->sin6_addr.s6_addr16[1] = 0;
911 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
912 }
913 spidx->prefd = sizeof(struct in6_addr) << 3;
914
915 return 0;
916 }
917 #endif
918
919 static void
920 ipsec_delpcbpolicy(p)
921 struct inpcbpolicy *p;
922 {
923 free(p, M_IPSEC_INPCB);
924 }
925
926 /* initialize policy in PCB */
927 int
928 ipsec_init_policy(so, pcb_sp)
929 struct socket *so;
930 struct inpcbpolicy **pcb_sp;
931 {
932 INIT_VNET_IPSEC(curvnet);
933 struct inpcbpolicy *new;
934
935 /* sanity check. */
936 if (so == NULL || pcb_sp == NULL)
937 panic("%s: NULL pointer was passed.\n", __func__);
938
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