Annotation of src/sys/netipsec/ipsec.c, Revision 1.28
1.28 ! degroote 1: /* $NetBSD: ipsec.c,v 1.27 2007/03/04 06:03:28 christos Exp $ */
1.1 jonathan 2: /* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam 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
1.26 degroote 13: * notice, this list of conditions and the following disclaimer.
1.1 jonathan 14: * 2. Redistributions in binary form must reproduce the above copyright
1.26 degroote 15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
1.1 jonathan 17: * 3. Neither the name of the project nor the names of its contributors
1.26 degroote 18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
1.1 jonathan 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: #include <sys/cdefs.h>
1.28 ! degroote 35: __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.27 2007/03/04 06:03:28 christos Exp $");
1.1 jonathan 36:
37: /*
38: * IPsec controller part.
39: */
40:
41: #include "opt_inet.h"
1.2 jonathan 42: #ifdef __FreeBSD__
1.1 jonathan 43: #include "opt_inet6.h"
1.2 jonathan 44: #endif
1.1 jonathan 45: #include "opt_ipsec.h"
46:
47: #include <sys/param.h>
48: #include <sys/systm.h>
49: #include <sys/malloc.h>
50: #include <sys/mbuf.h>
51: #include <sys/domain.h>
52: #include <sys/protosw.h>
53: #include <sys/socket.h>
54: #include <sys/socketvar.h>
55: #include <sys/errno.h>
56: #include <sys/time.h>
57: #include <sys/kernel.h>
58: #include <sys/syslog.h>
59: #include <sys/sysctl.h>
60: #include <sys/proc.h>
61:
62: #include <net/if.h>
63: #include <net/route.h>
64:
65: #include <netinet/in.h>
66: #include <netinet/in_systm.h>
67: #include <netinet/ip.h>
68: #include <netinet/ip_var.h>
69: #include <netinet/in_var.h>
70: #include <netinet/udp.h>
71: #include <netinet/udp_var.h>
72: #include <netinet/tcp.h>
73: #include <netinet/udp.h>
74:
75: #include <netinet/ip6.h>
76: #ifdef INET6
77: #include <netinet6/ip6_var.h>
78: #endif
79: #include <netinet/in_pcb.h>
80: #ifdef INET6
1.5 jonathan 81: #include <netinet6/in6_pcb.h>
1.1 jonathan 82: #include <netinet/icmp6.h>
83: #endif
84:
85: #include <netipsec/ipsec.h>
1.13 jonathan 86: #include <netipsec/ipsec_var.h>
1.1 jonathan 87: #ifdef INET6
88: #include <netipsec/ipsec6.h>
89: #endif
90: #include <netipsec/ah_var.h>
91: #include <netipsec/esp_var.h>
92: #include <netipsec/ipcomp.h> /*XXX*/
93: #include <netipsec/ipcomp_var.h>
94:
1.4 tls 95: #include <netipsec/key.h>
96: #include <netipsec/keydb.h>
97: #include <netipsec/key_debug.h>
1.1 jonathan 98:
99: #include <netipsec/xform.h>
100:
101: #include <netipsec/ipsec_osdep.h>
102:
103: #include <net/net_osdep.h>
104:
105: #ifdef IPSEC_DEBUG
106: int ipsec_debug = 1;
1.21 rpaulo 107:
1.26 degroote 108: /*
1.21 rpaulo 109: * When set to 1, IPsec will send packets with the same sequence number.
110: * This allows to verify if the other side has proper replay attacks detection.
111: */
112: int ipsec_replay = 0;
113:
114: /*
115: * When set 1, IPsec will send packets with corrupted HMAC.
116: * This allows to verify if the other side properly detects modified packets.
117: */
118: int ipsec_integrity = 0;
1.1 jonathan 119: #else
120: int ipsec_debug = 0;
121: #endif
122:
123: /* NB: name changed so netstat doesn't use it */
124: struct newipsecstat newipsecstat;
125: int ip4_ah_offsetmask = 0; /* maybe IP_DF? */
1.18 christos 126: int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */
1.1 jonathan 127: int ip4_esp_trans_deflev = IPSEC_LEVEL_USE;
128: int ip4_esp_net_deflev = IPSEC_LEVEL_USE;
129: int ip4_ah_trans_deflev = IPSEC_LEVEL_USE;
130: int ip4_ah_net_deflev = IPSEC_LEVEL_USE;
131: struct secpolicy ip4_def_policy;
132: int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
133: int ip4_esp_randpad = -1;
1.9 thorpej 134:
135: #ifdef __NetBSD__
136: u_int ipsec_spdgen = 1; /* SPD generation # */
137:
138: static struct secpolicy *ipsec_checkpcbcache __P((struct mbuf *,
139: struct inpcbpolicy *, int));
140: static int ipsec_fillpcbcache __P((struct inpcbpolicy *, struct mbuf *,
141: struct secpolicy *, int));
142: static int ipsec_invalpcbcache __P((struct inpcbpolicy *, int));
143: #endif /* __NetBSD__ */
144:
1.1 jonathan 145: /*
146: * Crypto support requirements:
147: *
148: * 1 require hardware support
149: * -1 require software support
150: * 0 take anything
151: */
152: int crypto_support = 0;
153:
1.5 jonathan 154: static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int,
155: PCB_T *, int *);
156:
1.1 jonathan 157: #ifdef __FreeBSD__
158: SYSCTL_DECL(_net_inet_ipsec);
159:
160: /* net.inet.ipsec */
161: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY,
162: def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
163: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
164: CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "");
165: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
166: CTLFLAG_RW, &ip4_esp_net_deflev, 0, "");
167: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
168: CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "");
169: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
170: CTLFLAG_RW, &ip4_ah_net_deflev, 0, "");
171: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS,
172: ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, "");
173: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK,
174: ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, "");
175: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT,
176: dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "");
177: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN,
178: ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, "");
179: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG,
180: debug, CTLFLAG_RW, &ipsec_debug, 0, "");
181: SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD,
182: esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, "");
183: SYSCTL_INT(_net_inet_ipsec, OID_AUTO,
184: crypto_support, CTLFLAG_RW, &crypto_support,0, "");
185: SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO,
186: ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, "");
1.21 rpaulo 187: SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0,
1.26 degroote 188: "Emulate replay attack");
1.21 rpaulo 189: SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW,
1.26 degroote 190: &ipsec_integrity, 0, "Emulate man-in-the-middle attack");
1.4 tls 191: #endif /* __FreeBSD__ */
1.1 jonathan 192:
193: #ifdef INET6
194: int ip6_esp_trans_deflev = IPSEC_LEVEL_USE;
195: int ip6_esp_net_deflev = IPSEC_LEVEL_USE;
196: int ip6_ah_trans_deflev = IPSEC_LEVEL_USE;
197: int ip6_ah_net_deflev = IPSEC_LEVEL_USE;
1.5 jonathan 198: struct secpolicy ip6_def_policy;
1.1 jonathan 199: int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */
200: int ip6_esp_randpad = -1;
201:
1.5 jonathan 202:
203: #ifdef __FreeBSD__
1.1 jonathan 204: SYSCTL_DECL(_net_inet6_ipsec6);
205:
206: /* net.inet6.ipsec6 */
207: #ifdef COMPAT_KAME
208: SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD,
209: 0,0, compat_ipsecstats_sysctl, "S", "");
210: #endif /* COMPAT_KAME */
211: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY,
212: def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "");
213: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev,
214: CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "");
215: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev,
216: CTLFLAG_RW, &ip6_esp_net_deflev, 0, "");
217: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev,
218: CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "");
219: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev,
220: CTLFLAG_RW, &ip6_ah_net_deflev, 0, "");
221: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN,
222: ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, "");
223: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG,
224: debug, CTLFLAG_RW, &ipsec_debug, 0, "");
225: SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD,
226: esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, "");
227: #endif /* INET6 */
1.6 jonathan 228: #endif /* __FreeBSD__ */
1.1 jonathan 229:
230: static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb));
231: #ifdef INET6
232: static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb));
233: #endif
234: static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int));
235: static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
236: static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
237: #ifdef INET6
238: static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int));
239: static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *));
240: #endif
241: static void ipsec_delpcbpolicy __P((struct inpcbpolicy *));
242: static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src));
243: static int ipsec_set_policy __P((struct secpolicy **pcb_sp,
1.27 christos 244: int optname, void *request, size_t len, int priv));
1.1 jonathan 245: static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp));
246: static void vshiftl __P((unsigned char *, int, int));
247: static size_t ipsec_hdrsiz __P((struct secpolicy *));
248:
1.9 thorpej 249: #ifdef __NetBSD__
250: /*
251: * Try to validate and use cached policy on a PCB.
252: */
253: static struct secpolicy *
254: ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir)
255: {
256: struct secpolicyindex spidx;
257:
258: switch (dir) {
259: case IPSEC_DIR_INBOUND:
260: case IPSEC_DIR_OUTBOUND:
261: case IPSEC_DIR_ANY:
262: break;
263: default:
264: return NULL;
265: }
266: #ifdef DIAGNOSTIC
1.13 jonathan 267: if (pcbsp == NULL) {
268: printf("ipsec_checkpcbcache: NULL pcbsp\n");
269: /* XXX panic? */
270: return NULL;
271: }
272: #endif
273:
274: #ifdef DIAGNOSTIC
1.9 thorpej 275: if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
276: panic("dir too big in ipsec_checkpcbcache");
277: #endif
278: /* SPD table change invalidate all the caches. */
279: if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) {
280: ipsec_invalpcbcache(pcbsp, dir);
281: return NULL;
282: }
283: if (!pcbsp->sp_cache[dir].cachesp)
284: return NULL;
285: if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) {
286: ipsec_invalpcbcache(pcbsp, dir);
287: return NULL;
288: }
289: if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
290: if (!pcbsp->sp_cache[dir].cachesp)
291: return NULL;
292: if (ipsec_setspidx(m, &spidx, 1) != 0)
293: return NULL;
294: if (bcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx,
295: sizeof(spidx))) {
296: if (!key_cmpspidx_withmask(&pcbsp->sp_cache[dir].cachesp->spidx,
1.26 degroote 297: &spidx))
1.9 thorpej 298: return NULL;
299: pcbsp->sp_cache[dir].cacheidx = spidx;
300: }
301: } else {
302: /*
303: * The pcb is connected, and the L4 code is sure that:
304: * - outgoing side uses inp_[lf]addr
305: * - incoming side looks up policy after inpcb lookup
306: * and address pair is know to be stable. We do not need
307: * to generate spidx again, nor check the address match again.
308: *
309: * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds
310: * and there are calls to ipsec_pcbconn() from in_pcbconnect().
311: */
312: }
313:
1.23 kardel 314: pcbsp->sp_cache[dir].cachesp->lastused = time_second;
1.9 thorpej 315: pcbsp->sp_cache[dir].cachesp->refcnt++;
316: KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
317: printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n",
318: pcbsp->sp_cache[dir].cachesp->refcnt,
319: pcbsp->sp_cache[dir].cachesp));
320: return pcbsp->sp_cache[dir].cachesp;
321: }
322:
323: static int
324: ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m,
1.26 degroote 325: struct secpolicy *sp, int dir)
1.9 thorpej 326: {
327:
328: switch (dir) {
329: case IPSEC_DIR_INBOUND:
330: case IPSEC_DIR_OUTBOUND:
331: break;
332: default:
333: return EINVAL;
334: }
335: #ifdef DIAGNOSTIC
336: if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0]))
337: panic("dir too big in ipsec_fillpcbcache");
338: #endif
339:
340: if (pcbsp->sp_cache[dir].cachesp)
341: KEY_FREESP(&pcbsp->sp_cache[dir].cachesp);
342: pcbsp->sp_cache[dir].cachesp = NULL;
343: pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE;
344: if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
345: return EINVAL;
346: }
347: pcbsp->sp_cache[dir].cachesp = sp;
348: if (pcbsp->sp_cache[dir].cachesp) {
349: pcbsp->sp_cache[dir].cachesp->refcnt++;
350: KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
351: printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n",
352: pcbsp->sp_cache[dir].cachesp->refcnt,
353: pcbsp->sp_cache[dir].cachesp));
354:
355: /*
356: * If the PCB is connected, we can remember a hint to
357: * possibly short-circuit IPsec processing in other places.
358: */
359: if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) {
360: switch (pcbsp->sp_cache[dir].cachesp->policy) {
361: case IPSEC_POLICY_NONE:
362: case IPSEC_POLICY_BYPASS:
363: pcbsp->sp_cache[dir].cachehint =
1.26 degroote 364: IPSEC_PCBHINT_NO;
1.9 thorpej 365: break;
366: default:
367: pcbsp->sp_cache[dir].cachehint =
1.26 degroote 368: IPSEC_PCBHINT_YES;
1.9 thorpej 369: }
370: }
371: }
372: pcbsp->sp_cache[dir].cachegen = ipsec_spdgen;
373:
374: return 0;
375: }
376:
377: static int
378: ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir)
379: {
380: int i;
381:
382: for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) {
383: if (dir != IPSEC_DIR_ANY && i != dir)
384: continue;
385: if (pcbsp->sp_cache[i].cachesp)
386: KEY_FREESP(&pcbsp->sp_cache[i].cachesp);
387: pcbsp->sp_cache[i].cachesp = NULL;
388: pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE;
389: pcbsp->sp_cache[i].cachegen = 0;
390: bzero(&pcbsp->sp_cache[i].cacheidx,
1.26 degroote 391: sizeof(pcbsp->sp_cache[i].cacheidx));
1.9 thorpej 392: }
393: return 0;
394: }
395:
396: void
397: ipsec_pcbconn(struct inpcbpolicy *pcbsp)
398: {
399:
400: pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED;
401: ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
402: }
403:
404: void
405: ipsec_pcbdisconn(struct inpcbpolicy *pcbsp)
406: {
407:
408: pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED;
409: ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY);
410: }
411:
412: void
413: ipsec_invalpcbcacheall(void)
414: {
415:
416: if (ipsec_spdgen == UINT_MAX)
417: ipsec_spdgen = 1;
418: else
419: ipsec_spdgen++;
420: }
421: #endif /* __NetBSD__ */
422:
1.1 jonathan 423: /*
424: * Return a held reference to the default SP.
425: */
426: static struct secpolicy *
427: key_allocsp_default(const char* where, int tag)
428: {
429: struct secpolicy *sp;
430:
431: KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
432: printf("DP key_allocsp_default from %s:%u\n", where, tag));
433:
434: sp = &ip4_def_policy;
435: if (sp->policy != IPSEC_POLICY_DISCARD &&
1.26 degroote 436: sp->policy != IPSEC_POLICY_NONE) {
1.1 jonathan 437: ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n",
1.26 degroote 438: sp->policy, IPSEC_POLICY_NONE));
1.1 jonathan 439: sp->policy = IPSEC_POLICY_NONE;
440: }
441: sp->refcnt++;
442:
443: KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
444: printf("DP key_allocsp_default returns SP:%p (%u)\n",
445: sp, sp->refcnt));
446: return sp;
447: }
448: #define KEY_ALLOCSP_DEFAULT() \
449: key_allocsp_default(__FILE__, __LINE__)
450:
451: /*
452: * For OUTBOUND packet having a socket. Searching SPD for packet,
453: * and return a pointer to SP.
454: * OUT: NULL: no apropreate SP found, the following value is set to error.
455: * 0 : bypass
456: * EACCES : discard packet.
457: * ENOENT : ipsec_acquire() in progress, maybe.
1.7 wiz 458: * others : error occurred.
1.1 jonathan 459: * others: a pointer to SP
460: *
1.20 wiz 461: * NOTE: IPv6 mapped address concern is implemented here.
1.1 jonathan 462: */
463: struct secpolicy *
464: ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir)
465: {
466: struct secpolicy *sp;
467:
468: IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi"));
469: IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
470: ("ipsec_getpolicy: invalid direction %u", dir));
471:
472: sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir);
473: if (sp == NULL) /*XXX????*/
474: sp = KEY_ALLOCSP_DEFAULT();
475: IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP"));
476: return sp;
477: }
478:
479: /*
480: * For OUTBOUND packet having a socket. Searching SPD for packet,
481: * and return a pointer to SP.
482: * OUT: NULL: no apropreate SP found, the following value is set to error.
483: * 0 : bypass
484: * EACCES : discard packet.
485: * ENOENT : ipsec_acquire() in progress, maybe.
1.7 wiz 486: * others : error occurred.
1.1 jonathan 487: * others: a pointer to SP
488: *
1.20 wiz 489: * NOTE: IPv6 mapped address concern is implemented here.
1.1 jonathan 490: */
1.5 jonathan 491: static struct secpolicy *
1.1 jonathan 492: ipsec_getpolicybysock(m, dir, inp, error)
493: struct mbuf *m;
494: u_int dir;
1.5 jonathan 495: PCB_T *inp;
1.1 jonathan 496: int *error;
497: {
498: struct inpcbpolicy *pcbsp = NULL;
499: struct secpolicy *currsp = NULL; /* policy on socket */
500: struct secpolicy *sp;
501: int af;
502:
503: IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf"));
504: IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb"));
505: IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error"));
506: IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
507: ("ipsec_getpolicybysock: invalid direction %u", dir));
508:
1.9 thorpej 509: IPSEC_ASSERT(PCB_SOCKET(inp) != NULL,
1.26 degroote 510: ("ipsec_getppolicybysock: null socket\n"));
1.5 jonathan 511:
512: /* XXX FIXME inpcb/in6pcb vs socket*/
513: af = PCB_FAMILY(inp);
1.1 jonathan 514: IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
515: ("ipsec_getpolicybysock: unexpected protocol family %u", af));
516:
1.9 thorpej 517: #ifdef __NetBSD__
1.13 jonathan 518: IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache"));
1.9 thorpej 519: /* If we have a cached entry, and if it is still valid, use it. */
520: ipsecstat.ips_spdcache_lookup++;
521: currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir);
522: if (currsp) {
523: *error = 0;
524: return currsp;
525: }
526: ipsecstat.ips_spdcache_miss++;
527: #endif /* __NetBSD__ */
528:
1.1 jonathan 529: switch (af) {
1.5 jonathan 530: case AF_INET: {
531: struct inpcb *in4p = PCB_TO_IN4PCB(inp);
1.1 jonathan 532: /* set spidx in pcb */
1.5 jonathan 533: *error = ipsec4_setspidx_inpcb(m, in4p);
534: pcbsp = in4p->inp_sp;
1.1 jonathan 535: break;
1.5 jonathan 536: }
537:
538: #if defined(INET6)
539: case AF_INET6: {
540: struct in6pcb *in6p = PCB_TO_IN6PCB(inp);
1.1 jonathan 541: /* set spidx in pcb */
1.5 jonathan 542: *error = ipsec6_setspidx_in6pcb(m, in6p);
543: pcbsp = in6p->in6p_sp;
1.1 jonathan 544: break;
1.5 jonathan 545: }
1.1 jonathan 546: #endif
547: default:
548: *error = EPFNOSUPPORT;
549: break;
550: }
551: if (*error)
552: return NULL;
553:
554: IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp"));
555: switch (dir) {
556: case IPSEC_DIR_INBOUND:
557: currsp = pcbsp->sp_in;
558: break;
559: case IPSEC_DIR_OUTBOUND:
560: currsp = pcbsp->sp_out;
561: break;
562: }
563: IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp"));
564:
565: if (pcbsp->priv) { /* when privilieged socket */
566: switch (currsp->policy) {
567: case IPSEC_POLICY_BYPASS:
568: case IPSEC_POLICY_IPSEC:
569: currsp->refcnt++;
570: sp = currsp;
571: break;
572:
573: case IPSEC_POLICY_ENTRUST:
574: /* look for a policy in SPD */
575: sp = KEY_ALLOCSP(&currsp->spidx, dir);
576: if (sp == NULL) /* no SP found */
577: sp = KEY_ALLOCSP_DEFAULT();
578: break;
579:
580: default:
581: ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
1.26 degroote 582: "Invalid policy for PCB %d\n", currsp->policy));
1.1 jonathan 583: *error = EINVAL;
584: return NULL;
585: }
586: } else { /* unpriv, SPD has policy */
587: sp = KEY_ALLOCSP(&currsp->spidx, dir);
588: if (sp == NULL) { /* no SP found */
589: switch (currsp->policy) {
590: case IPSEC_POLICY_BYPASS:
591: ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
1.26 degroote 592: "Illegal policy for non-priviliged defined %d\n",
1.1 jonathan 593: currsp->policy));
594: *error = EINVAL;
595: return NULL;
596:
597: case IPSEC_POLICY_ENTRUST:
598: sp = KEY_ALLOCSP_DEFAULT();
599: break;
600:
601: case IPSEC_POLICY_IPSEC:
602: currsp->refcnt++;
603: sp = currsp;
604: break;
605:
606: default:
607: ipseclog((LOG_ERR, "ipsec_getpolicybysock: "
608: "Invalid policy for PCB %d\n", currsp->policy));
609: *error = EINVAL;
610: return NULL;
611: }
612: }
613: }
614: IPSEC_ASSERT(sp != NULL,
615: ("ipsec_getpolicybysock: null SP (priv %u policy %u",
616: pcbsp->priv, currsp->policy));
617: KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
618: printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates "
1.26 degroote 619: "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy,
620: sp, sp->refcnt));
1.9 thorpej 621: #ifdef __NetBSD__
622: ipsec_fillpcbcache(pcbsp, m, sp, dir);
623: #endif /* __NetBSD__ */
1.1 jonathan 624: return sp;
625: }
626:
627: /*
628: * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet,
629: * and return a pointer to SP.
630: * OUT: positive: a pointer to the entry for security policy leaf matched.
631: * NULL: no apropreate SP found, the following value is set to error.
632: * 0 : bypass
633: * EACCES : discard packet.
634: * ENOENT : ipsec_acquire() in progress, maybe.
1.7 wiz 635: * others : error occurred.
1.1 jonathan 636: */
637: struct secpolicy *
638: ipsec_getpolicybyaddr(m, dir, flag, error)
639: struct mbuf *m;
640: u_int dir;
641: int flag;
642: int *error;
643: {
644: struct secpolicyindex spidx;
645: struct secpolicy *sp;
646:
647: IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf"));
648: IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error"));
649: IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND,
650: ("ipsec4_getpolicybaddr: invalid direction %u", dir));
651:
652: sp = NULL;
653: if (key_havesp(dir)) {
654: /* Make an index to look for a policy. */
655: *error = ipsec_setspidx(m, &spidx,
656: (flag & IP_FORWARDING) ? 0 : 1);
657: if (*error != 0) {
658: DPRINTF(("ipsec_getpolicybyaddr: setpidx failed,"
659: " dir %u flag %u\n", dir, flag));
660: bzero(&spidx, sizeof (spidx));
661: return NULL;
662: }
663: spidx.dir = dir;
664:
665: sp = KEY_ALLOCSP(&spidx, dir);
666: }
667: if (sp == NULL) /* no SP found, use system default */
668: sp = KEY_ALLOCSP_DEFAULT();
669: IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP"));
670: return sp;
671: }
672:
673: struct secpolicy *
674: ipsec4_checkpolicy(m, dir, flag, error, inp)
675: struct mbuf *m;
676: u_int dir, flag;
677: int *error;
678: struct inpcb *inp;
679: {
680: struct secpolicy *sp;
681:
682: *error = 0;
1.5 jonathan 683:
684:
685: /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
686: if (inp == NULL || inp->inp_socket == NULL) {
1.1 jonathan 687: sp = ipsec_getpolicybyaddr(m, dir, flag, error);
1.5 jonathan 688: } else
689: sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error);
1.1 jonathan 690: if (sp == NULL) {
691: IPSEC_ASSERT(*error != 0,
692: ("ipsec4_checkpolicy: getpolicy failed w/o error"));
693: newipsecstat.ips_out_inval++;
694: return NULL;
695: }
696: IPSEC_ASSERT(*error == 0,
697: ("ipsec4_checkpolicy: sp w/ error set to %u", *error));
698: switch (sp->policy) {
699: case IPSEC_POLICY_ENTRUST:
700: default:
701: printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy);
702: /* fall thru... */
703: case IPSEC_POLICY_DISCARD:
704: newipsecstat.ips_out_polvio++;
705: *error = -EINVAL; /* packet is discarded by caller */
706: break;
707: case IPSEC_POLICY_BYPASS:
708: case IPSEC_POLICY_NONE:
709: KEY_FREESP(&sp);
710: sp = NULL; /* NB: force NULL result */
711: break;
712: case IPSEC_POLICY_IPSEC:
713: if (sp->req == NULL) /* acquire an SA */
714: *error = key_spdacquire(sp);
715: break;
716: }
717: if (*error != 0) {
718: KEY_FREESP(&sp);
719: sp = NULL;
720: }
1.5 jonathan 721: DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
1.1 jonathan 722: return sp;
723: }
724:
1.26 degroote 725: #ifdef INET6
726: struct secpolicy *
727: ipsec6_checkpolicy(m, dir, flag, error, in6p)
728: struct mbuf *m;
729: u_int dir, flag;
730: int *error;
731: struct in6pcb *in6p;
732: {
733: struct secpolicy *sp;
734:
735: *error = 0;
736:
737:
738: /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */
739: if (in6p == NULL || in6p->in6p_socket == NULL) {
740: sp = ipsec_getpolicybyaddr(m, dir, flag, error);
741: } else
742: sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error);
743: if (sp == NULL) {
744: IPSEC_ASSERT(*error != 0,
745: ("ipsec6_checkpolicy: getpolicy failed w/o error"));
746: newipsecstat.ips_out_inval++;
747: return NULL;
748: }
749: IPSEC_ASSERT(*error == 0,
750: ("ipsec6_checkpolicy: sp w/ error set to %u", *error));
751: switch (sp->policy) {
752: case IPSEC_POLICY_ENTRUST:
753: default:
754: printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy);
755: /* fall thru... */
756: case IPSEC_POLICY_DISCARD:
757: newipsecstat.ips_out_polvio++;
758: *error = -EINVAL; /* packet is discarded by caller */
759: break;
760: case IPSEC_POLICY_BYPASS:
761: case IPSEC_POLICY_NONE:
762: KEY_FREESP(&sp);
763: sp = NULL; /* NB: force NULL result */
764: break;
765: case IPSEC_POLICY_IPSEC:
766: if (sp->req == NULL) /* acquire an SA */
767: *error = key_spdacquire(sp);
768: break;
769: }
770: if (*error != 0) {
771: KEY_FREESP(&sp);
772: sp = NULL;
773: }
774: DPRINTF(("ipsecpol: done, sp %p error %d, \n", sp, *error));
775: return sp;
776: }
777: #endif /* INET6 */
778:
1.1 jonathan 779: static int
780: ipsec4_setspidx_inpcb(m, pcb)
781: struct mbuf *m;
782: struct inpcb *pcb;
783: {
784: int error;
785:
786: IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb"));
787: IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp"));
788: IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL,
789: ("ipsec4_setspidx_inpcb: null sp_in || sp_out"));
790:
791: error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1);
792: if (error == 0) {
793: pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
794: pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx;
795: pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
796: } else {
797: bzero(&pcb->inp_sp->sp_in->spidx,
798: sizeof (pcb->inp_sp->sp_in->spidx));
799: bzero(&pcb->inp_sp->sp_out->spidx,
800: sizeof (pcb->inp_sp->sp_in->spidx));
801: }
802: return error;
803: }
804:
805: #ifdef INET6
806: static int
807: ipsec6_setspidx_in6pcb(m, pcb)
808: struct mbuf *m;
809: struct in6pcb *pcb;
810: {
811: struct secpolicyindex *spidx;
812: int error;
813:
814: IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb"));
815: IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp"));
816: IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL,
817: ("ipsec6_setspidx_in6pcb: null sp_in || sp_out"));
818:
819: bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
820: bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
821:
822: spidx = &pcb->in6p_sp->sp_in->spidx;
823: error = ipsec_setspidx(m, spidx, 1);
824: if (error)
825: goto bad;
826: spidx->dir = IPSEC_DIR_INBOUND;
827:
828: spidx = &pcb->in6p_sp->sp_out->spidx;
829: error = ipsec_setspidx(m, spidx, 1);
830: if (error)
831: goto bad;
832: spidx->dir = IPSEC_DIR_OUTBOUND;
833:
834: return 0;
835:
836: bad:
837: bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx));
838: bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx));
839: return error;
840: }
841: #endif
842:
843: /*
844: * configure security policy index (src/dst/proto/sport/dport)
845: * by looking at the content of mbuf.
846: * the caller is responsible for error recovery (like clearing up spidx).
847: */
848: static int
849: ipsec_setspidx(m, spidx, needport)
850: struct mbuf *m;
851: struct secpolicyindex *spidx;
852: int needport;
853: {
854: struct ip *ip = NULL;
855: struct ip ipbuf;
856: u_int v;
857: struct mbuf *n;
858: int len;
859: int error;
860:
861: IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf"));
862:
863: /*
864: * validate m->m_pkthdr.len. we see incorrect length if we
865: * mistakenly call this function with inconsistent mbuf chain
866: * (like 4.4BSD tcp/udp processing). XXX should we panic here?
867: */
868: len = 0;
869: for (n = m; n; n = n->m_next)
870: len += n->m_len;
871: if (m->m_pkthdr.len != len) {
872: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
873: printf("ipsec_setspidx: "
1.26 degroote 874: "total of m_len(%d) != pkthdr.len(%d), "
875: "ignored.\n",
1.1 jonathan 876: len, m->m_pkthdr.len));
877: return EINVAL;
878: }
879:
880: if (m->m_pkthdr.len < sizeof(struct ip)) {
881: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
882: printf("ipsec_setspidx: "
1.26 degroote 883: "pkthdr.len(%d) < sizeof(struct ip), ignored.\n",
884: m->m_pkthdr.len));
1.1 jonathan 885: return EINVAL;
886: }
887:
888: if (m->m_len >= sizeof(*ip))
889: ip = mtod(m, struct ip *);
890: else {
1.28 ! degroote 891: m_copydata(m, 0, sizeof(ipbuf), &ipbuf);
1.1 jonathan 892: ip = &ipbuf;
893: }
894: #ifdef _IP_VHL
895: v = _IP_VHL_V(ip->ip_vhl);
896: #else
897: v = ip->ip_v;
898: #endif
899: switch (v) {
900: case 4:
901: error = ipsec4_setspidx_ipaddr(m, spidx);
902: if (error)
903: return error;
904: ipsec4_get_ulp(m, spidx, needport);
905: return 0;
906: #ifdef INET6
907: case 6:
908: if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) {
909: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
910: printf("ipsec_setspidx: "
1.26 degroote 911: "pkthdr.len(%d) < sizeof(struct ip6_hdr), "
912: "ignored.\n", m->m_pkthdr.len));
1.1 jonathan 913: return EINVAL;
914: }
915: error = ipsec6_setspidx_ipaddr(m, spidx);
916: if (error)
917: return error;
918: ipsec6_get_ulp(m, spidx, needport);
919: return 0;
920: #endif
921: default:
922: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
923: printf("ipsec_setspidx: "
1.26 degroote 924: "unknown IP version %u, ignored.\n", v));
1.1 jonathan 925: return EINVAL;
926: }
927: }
928:
929: static void
930: ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport)
931: {
932: u_int8_t nxt;
933: int off;
934:
935: /* sanity check */
936: IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf"));
937: IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),
938: ("ipsec4_get_ulp: packet too short"));
939:
940: /* NB: ip_input() flips it into host endian XXX need more checking */
1.8 thorpej 941: if (m->m_len >= sizeof(struct ip)) {
1.1 jonathan 942: struct ip *ip = mtod(m, struct ip *);
943: if (ip->ip_off & (IP_MF | IP_OFFMASK))
944: goto done;
945: #ifdef _IP_VHL
946: off = _IP_VHL_HL(ip->ip_vhl) << 2;
947: #else
948: off = ip->ip_hl << 2;
949: #endif
950: nxt = ip->ip_p;
951: } else {
952: struct ip ih;
953:
1.28 ! degroote 954: m_copydata(m, 0, sizeof (struct ip), &ih);
1.1 jonathan 955: if (ih.ip_off & (IP_MF | IP_OFFMASK))
956: goto done;
957: #ifdef _IP_VHL
958: off = _IP_VHL_HL(ih.ip_vhl) << 2;
959: #else
960: off = ih.ip_hl << 2;
961: #endif
962: nxt = ih.ip_p;
963: }
964:
965: while (off < m->m_pkthdr.len) {
966: struct ip6_ext ip6e;
967: struct tcphdr th;
968: struct udphdr uh;
969:
970: switch (nxt) {
971: case IPPROTO_TCP:
972: spidx->ul_proto = nxt;
973: if (!needport)
974: goto done_proto;
975: if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
976: goto done;
1.28 ! degroote 977: m_copydata(m, off, sizeof (th), &th);
1.1 jonathan 978: spidx->src.sin.sin_port = th.th_sport;
979: spidx->dst.sin.sin_port = th.th_dport;
980: return;
981: case IPPROTO_UDP:
982: spidx->ul_proto = nxt;
983: if (!needport)
984: goto done_proto;
985: if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
986: goto done;
1.28 ! degroote 987: m_copydata(m, off, sizeof (uh), &uh);
1.1 jonathan 988: spidx->src.sin.sin_port = uh.uh_sport;
989: spidx->dst.sin.sin_port = uh.uh_dport;
990: return;
991: case IPPROTO_AH:
992: if (m->m_pkthdr.len > off + sizeof(ip6e))
993: goto done;
994: /* XXX sigh, this works but is totally bogus */
1.28 ! degroote 995: m_copydata(m, off, sizeof(ip6e), &ip6e);
1.1 jonathan 996: off += (ip6e.ip6e_len + 2) << 2;
997: nxt = ip6e.ip6e_nxt;
998: break;
999: case IPPROTO_ICMP:
1000: default:
1001: /* XXX intermediate headers??? */
1002: spidx->ul_proto = nxt;
1003: goto done_proto;
1004: }
1005: }
1006: done:
1007: spidx->ul_proto = IPSEC_ULPROTO_ANY;
1008: done_proto:
1009: spidx->src.sin.sin_port = IPSEC_PORT_ANY;
1010: spidx->dst.sin.sin_port = IPSEC_PORT_ANY;
1011: }
1012:
1013: /* assumes that m is sane */
1014: static int
1015: ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx)
1016: {
1017: static const struct sockaddr_in template = {
1018: sizeof (struct sockaddr_in),
1019: AF_INET,
1020: 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 }
1021: };
1022:
1023: spidx->src.sin = template;
1024: spidx->dst.sin = template;
1025:
1026: if (m->m_len < sizeof (struct ip)) {
1027: m_copydata(m, offsetof(struct ip, ip_src),
1028: sizeof (struct in_addr),
1.28 ! degroote 1029: &spidx->src.sin.sin_addr);
1.1 jonathan 1030: m_copydata(m, offsetof(struct ip, ip_dst),
1031: sizeof (struct in_addr),
1.28 ! degroote 1032: &spidx->dst.sin.sin_addr);
1.1 jonathan 1033: } else {
1034: struct ip *ip = mtod(m, struct ip *);
1035: spidx->src.sin.sin_addr = ip->ip_src;
1036: spidx->dst.sin.sin_addr = ip->ip_dst;
1037: }
1038:
1039: spidx->prefs = sizeof(struct in_addr) << 3;
1040: spidx->prefd = sizeof(struct in_addr) << 3;
1041:
1042: return 0;
1043: }
1044:
1045: #ifdef INET6
1046: static void
1047: ipsec6_get_ulp(m, spidx, needport)
1048: struct mbuf *m;
1049: struct secpolicyindex *spidx;
1050: int needport;
1051: {
1052: int off, nxt;
1053: struct tcphdr th;
1054: struct udphdr uh;
1055:
1056: /* sanity check */
1057: if (m == NULL)
1.16 christos 1058: panic("ipsec6_get_ulp: NULL pointer was passed");
1.1 jonathan 1059:
1060: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1061: printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m));
1062:
1063: /* set default */
1064: spidx->ul_proto = IPSEC_ULPROTO_ANY;
1065: ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY;
1066: ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY;
1067:
1068: nxt = -1;
1069: off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
1070: if (off < 0 || m->m_pkthdr.len < off)
1071: return;
1072:
1073: switch (nxt) {
1074: case IPPROTO_TCP:
1075: spidx->ul_proto = nxt;
1076: if (!needport)
1077: break;
1078: if (off + sizeof(struct tcphdr) > m->m_pkthdr.len)
1079: break;
1.28 ! degroote 1080: m_copydata(m, off, sizeof(th), &th);
1.1 jonathan 1081: ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport;
1082: ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport;
1083: break;
1084: case IPPROTO_UDP:
1085: spidx->ul_proto = nxt;
1086: if (!needport)
1087: break;
1088: if (off + sizeof(struct udphdr) > m->m_pkthdr.len)
1089: break;
1.28 ! degroote 1090: m_copydata(m, off, sizeof(uh), &uh);
1.1 jonathan 1091: ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport;
1092: ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport;
1093: break;
1094: case IPPROTO_ICMPV6:
1095: default:
1096: /* XXX intermediate headers??? */
1097: spidx->ul_proto = nxt;
1098: break;
1099: }
1100: }
1101:
1102: /* assumes that m is sane */
1103: static int
1104: ipsec6_setspidx_ipaddr(m, spidx)
1105: struct mbuf *m;
1106: struct secpolicyindex *spidx;
1107: {
1108: struct ip6_hdr *ip6 = NULL;
1109: struct ip6_hdr ip6buf;
1110: struct sockaddr_in6 *sin6;
1111:
1112: if (m->m_len >= sizeof(*ip6))
1113: ip6 = mtod(m, struct ip6_hdr *);
1114: else {
1.28 ! degroote 1115: m_copydata(m, 0, sizeof(ip6buf), &ip6buf);
1.1 jonathan 1116: ip6 = &ip6buf;
1117: }
1118:
1119: sin6 = (struct sockaddr_in6 *)&spidx->src;
1120: bzero(sin6, sizeof(*sin6));
1121: sin6->sin6_family = AF_INET6;
1122: sin6->sin6_len = sizeof(struct sockaddr_in6);
1123: bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src));
1124: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
1125: sin6->sin6_addr.s6_addr16[1] = 0;
1126: sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]);
1127: }
1128: spidx->prefs = sizeof(struct in6_addr) << 3;
1129:
1130: sin6 = (struct sockaddr_in6 *)&spidx->dst;
1131: bzero(sin6, sizeof(*sin6));
1132: sin6->sin6_family = AF_INET6;
1133: sin6->sin6_len = sizeof(struct sockaddr_in6);
1134: bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst));
1135: if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
1136: sin6->sin6_addr.s6_addr16[1] = 0;
1137: sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
1138: }
1139: spidx->prefd = sizeof(struct in6_addr) << 3;
1140:
1141: return 0;
1142: }
1143: #endif
1144:
1145: static void
1146: ipsec_delpcbpolicy(p)
1147: struct inpcbpolicy *p;
1148: {
1149: free(p, M_SECA);
1150: }
1151:
1152: /* initialize policy in PCB */
1153: int
1154: ipsec_init_policy(so, pcb_sp)
1155: struct socket *so;
1156: struct inpcbpolicy **pcb_sp;
1157: {
1158: struct inpcbpolicy *new;
1159:
1160: /* sanity check. */
1161: if (so == NULL || pcb_sp == NULL)
1.16 christos 1162: panic("ipsec_init_policy: NULL pointer was passed");
1.1 jonathan 1163:
1164: new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy),
1.26 degroote 1165: M_SECA, M_NOWAIT|M_ZERO);
1.1 jonathan 1166: if (new == NULL) {
1167: ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n"));
1168: return ENOBUFS;
1169: }
1170:
1171: if (IPSEC_PRIVILEGED_SO(so))
1172: new->priv = 1;
1173: else
1174: new->priv = 0;
1175:
1176: if ((new->sp_in = KEY_NEWSP()) == NULL) {
1177: ipsec_delpcbpolicy(new);
1178: return ENOBUFS;
1179: }
1180: new->sp_in->state = IPSEC_SPSTATE_ALIVE;
1181: new->sp_in->policy = IPSEC_POLICY_ENTRUST;
1182:
1183: if ((new->sp_out = KEY_NEWSP()) == NULL) {
1184: KEY_FREESP(&new->sp_in);
1185: ipsec_delpcbpolicy(new);
1186: return ENOBUFS;
1187: }
1188: new->sp_out->state = IPSEC_SPSTATE_ALIVE;
1189: new->sp_out->policy = IPSEC_POLICY_ENTRUST;
1190:
1191: *pcb_sp = new;
1192:
1193: return 0;
1194: }
1195:
1196: /* copy old ipsec policy into new */
1197: int
1198: ipsec_copy_policy(old, new)
1199: struct inpcbpolicy *old, *new;
1200: {
1201: struct secpolicy *sp;
1202:
1203: sp = ipsec_deepcopy_policy(old->sp_in);
1204: if (sp) {
1205: KEY_FREESP(&new->sp_in);
1206: new->sp_in = sp;
1207: } else
1208: return ENOBUFS;
1209:
1210: sp = ipsec_deepcopy_policy(old->sp_out);
1211: if (sp) {
1212: KEY_FREESP(&new->sp_out);
1213: new->sp_out = sp;
1214: } else
1215: return ENOBUFS;
1216:
1217: new->priv = old->priv;
1218:
1219: return 0;
1220: }
1221:
1222: /* deep-copy a policy in PCB */
1223: static struct secpolicy *
1224: ipsec_deepcopy_policy(src)
1225: struct secpolicy *src;
1226: {
1227: struct ipsecrequest *newchain = NULL;
1228: struct ipsecrequest *p;
1229: struct ipsecrequest **q;
1230: struct ipsecrequest *r;
1231: struct secpolicy *dst;
1232:
1233: if (src == NULL)
1234: return NULL;
1235: dst = KEY_NEWSP();
1236: if (dst == NULL)
1237: return NULL;
1238:
1239: /*
1240: * deep-copy IPsec request chain. This is required since struct
1241: * ipsecrequest is not reference counted.
1242: */
1243: q = &newchain;
1244: for (p = src->req; p; p = p->next) {
1245: *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest),
1246: M_SECA, M_NOWAIT);
1247: if (*q == NULL)
1248: goto fail;
1249: bzero(*q, sizeof(**q));
1250: (*q)->next = NULL;
1251:
1252: (*q)->saidx.proto = p->saidx.proto;
1253: (*q)->saidx.mode = p->saidx.mode;
1254: (*q)->level = p->level;
1255: (*q)->saidx.reqid = p->saidx.reqid;
1256:
1257: bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src));
1258: bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst));
1259:
1260: (*q)->sav = NULL;
1261: (*q)->sp = dst;
1262:
1263: q = &((*q)->next);
1264: }
1265:
1266: dst->req = newchain;
1267: dst->state = src->state;
1268: dst->policy = src->policy;
1269: /* do not touch the refcnt fields */
1270:
1271: return dst;
1272:
1273: fail:
1274: for (p = newchain; p; p = r) {
1275: r = p->next;
1276: free(p, M_SECA);
1277: p = NULL;
1278: }
1279: return NULL;
1280: }
1281:
1282: /* set policy and ipsec request if present. */
1283: static int
1.24 christos 1284: ipsec_set_policy(
1.26 degroote 1285: struct secpolicy **pcb_sp,
1286: int optname,
1.27 christos 1287: void *request,
1.26 degroote 1288: size_t len,
1289: int priv
1.24 christos 1290: )
1.1 jonathan 1291: {
1292: struct sadb_x_policy *xpl;
1293: struct secpolicy *newsp = NULL;
1294: int error;
1295:
1296: /* sanity check. */
1297: if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL)
1298: return EINVAL;
1299: if (len < sizeof(*xpl))
1300: return EINVAL;
1301: xpl = (struct sadb_x_policy *)request;
1302:
1303: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1304: printf("ipsec_set_policy: passed policy\n");
1305: kdebug_sadb_x_policy((struct sadb_ext *)xpl));
1306:
1307: /* check policy type */
1308: /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */
1309: if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD
1310: || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE)
1311: return EINVAL;
1312:
1313: /* check privileged socket */
1314: if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS)
1315: return EACCES;
1316:
1317: /* allocation new SP entry */
1318: if ((newsp = key_msg2sp(xpl, len, &error)) == NULL)
1319: return error;
1320:
1321: newsp->state = IPSEC_SPSTATE_ALIVE;
1322:
1323: /* clear old SP and set new SP */
1324: KEY_FREESP(pcb_sp);
1325: *pcb_sp = newsp;
1326: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1327: printf("ipsec_set_policy: new policy\n");
1328: kdebug_secpolicy(newsp));
1329:
1330: return 0;
1331: }
1332:
1333: static int
1334: ipsec_get_policy(pcb_sp, mp)
1335: struct secpolicy *pcb_sp;
1336: struct mbuf **mp;
1337: {
1338:
1339: /* sanity check. */
1340: if (pcb_sp == NULL || mp == NULL)
1341: return EINVAL;
1342:
1343: *mp = key_sp2msg(pcb_sp);
1344: if (!*mp) {
1345: ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n"));
1346: return ENOBUFS;
1347: }
1348:
1349: (*mp)->m_type = MT_DATA;
1350: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1351: printf("ipsec_get_policy:\n");
1352: kdebug_mbuf(*mp));
1353:
1354: return 0;
1355: }
1356:
1357: int
1358: ipsec4_set_policy(inp, optname, request, len, priv)
1359: struct inpcb *inp;
1360: int optname;
1.27 christos 1361: void *request;
1.1 jonathan 1362: size_t len;
1363: int priv;
1364: {
1365: struct sadb_x_policy *xpl;
1366: struct secpolicy **pcb_sp;
1367:
1368: /* sanity check. */
1369: if (inp == NULL || request == NULL)
1370: return EINVAL;
1371: if (len < sizeof(*xpl))
1372: return EINVAL;
1373: xpl = (struct sadb_x_policy *)request;
1374:
1375: IPSEC_ASSERT(inp->inp_sp != NULL,
1.26 degroote 1376: ("ipsec4_set_policy(): null inp->in_sp"));
1.1 jonathan 1377:
1378: /* select direction */
1379: switch (xpl->sadb_x_policy_dir) {
1380: case IPSEC_DIR_INBOUND:
1381: pcb_sp = &inp->inp_sp->sp_in;
1382: break;
1383: case IPSEC_DIR_OUTBOUND:
1384: pcb_sp = &inp->inp_sp->sp_out;
1385: break;
1386: default:
1387: ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1388: xpl->sadb_x_policy_dir));
1389: return EINVAL;
1390: }
1391:
1392: return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1393: }
1394:
1395: int
1396: ipsec4_get_policy(inp, request, len, mp)
1397: struct inpcb *inp;
1.27 christos 1398: void *request;
1.1 jonathan 1399: size_t len;
1400: struct mbuf **mp;
1401: {
1402: struct sadb_x_policy *xpl;
1403: struct secpolicy *pcb_sp;
1404:
1405: /* sanity check. */
1406: if (inp == NULL || request == NULL || mp == NULL)
1407: return EINVAL;
1408: IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp"));
1409: if (len < sizeof(*xpl))
1410: return EINVAL;
1411: xpl = (struct sadb_x_policy *)request;
1412:
1413: /* select direction */
1414: switch (xpl->sadb_x_policy_dir) {
1415: case IPSEC_DIR_INBOUND:
1416: pcb_sp = inp->inp_sp->sp_in;
1417: break;
1418: case IPSEC_DIR_OUTBOUND:
1419: pcb_sp = inp->inp_sp->sp_out;
1420: break;
1421: default:
1422: ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n",
1423: xpl->sadb_x_policy_dir));
1424: return EINVAL;
1425: }
1426:
1427: return ipsec_get_policy(pcb_sp, mp);
1428: }
1429:
1430: /* delete policy in PCB */
1431: int
1432: ipsec4_delete_pcbpolicy(inp)
1433: struct inpcb *inp;
1434: {
1435: IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp"));
1436:
1437: if (inp->inp_sp == NULL)
1438: return 0;
1439:
1440: if (inp->inp_sp->sp_in != NULL)
1441: KEY_FREESP(&inp->inp_sp->sp_in);
1442:
1443: if (inp->inp_sp->sp_out != NULL)
1444: KEY_FREESP(&inp->inp_sp->sp_out);
1445:
1446: ipsec_delpcbpolicy(inp->inp_sp);
1447: inp->inp_sp = NULL;
1448:
1449: return 0;
1450: }
1451:
1452: #ifdef INET6
1453: int
1454: ipsec6_set_policy(in6p, optname, request, len, priv)
1455: struct in6pcb *in6p;
1456: int optname;
1.27 christos 1457: void *request;
1.1 jonathan 1458: size_t len;
1459: int priv;
1460: {
1461: struct sadb_x_policy *xpl;
1462: struct secpolicy **pcb_sp;
1463:
1464: /* sanity check. */
1465: if (in6p == NULL || request == NULL)
1466: return EINVAL;
1467: if (len < sizeof(*xpl))
1468: return EINVAL;
1469: xpl = (struct sadb_x_policy *)request;
1470:
1471: /* select direction */
1472: switch (xpl->sadb_x_policy_dir) {
1473: case IPSEC_DIR_INBOUND:
1474: pcb_sp = &in6p->in6p_sp->sp_in;
1475: break;
1476: case IPSEC_DIR_OUTBOUND:
1477: pcb_sp = &in6p->in6p_sp->sp_out;
1478: break;
1479: default:
1480: ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1481: xpl->sadb_x_policy_dir));
1482: return EINVAL;
1483: }
1484:
1485: return ipsec_set_policy(pcb_sp, optname, request, len, priv);
1486: }
1487:
1488: int
1489: ipsec6_get_policy(in6p, request, len, mp)
1490: struct in6pcb *in6p;
1.27 christos 1491: void *request;
1.1 jonathan 1492: size_t len;
1493: struct mbuf **mp;
1494: {
1495: struct sadb_x_policy *xpl;
1496: struct secpolicy *pcb_sp;
1497:
1498: /* sanity check. */
1499: if (in6p == NULL || request == NULL || mp == NULL)
1500: return EINVAL;
1501: IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp"));
1502: if (len < sizeof(*xpl))
1503: return EINVAL;
1504: xpl = (struct sadb_x_policy *)request;
1505:
1506: /* select direction */
1507: switch (xpl->sadb_x_policy_dir) {
1508: case IPSEC_DIR_INBOUND:
1509: pcb_sp = in6p->in6p_sp->sp_in;
1510: break;
1511: case IPSEC_DIR_OUTBOUND:
1512: pcb_sp = in6p->in6p_sp->sp_out;
1513: break;
1514: default:
1515: ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n",
1516: xpl->sadb_x_policy_dir));
1517: return EINVAL;
1518: }
1519:
1520: return ipsec_get_policy(pcb_sp, mp);
1521: }
1522:
1523: int
1524: ipsec6_delete_pcbpolicy(in6p)
1525: struct in6pcb *in6p;
1526: {
1527: IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p"));
1528:
1529: if (in6p->in6p_sp == NULL)
1530: return 0;
1531:
1532: if (in6p->in6p_sp->sp_in != NULL)
1533: KEY_FREESP(&in6p->in6p_sp->sp_in);
1534:
1535: if (in6p->in6p_sp->sp_out != NULL)
1536: KEY_FREESP(&in6p->in6p_sp->sp_out);
1537:
1538: ipsec_delpcbpolicy(in6p->in6p_sp);
1539: in6p->in6p_sp = NULL;
1540:
1541: return 0;
1542: }
1543: #endif
1544:
1545: /*
1546: * return current level.
1547: * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned.
1548: */
1549: u_int
1550: ipsec_get_reqlevel(isr)
1551: struct ipsecrequest *isr;
1552: {
1553: u_int level = 0;
1554: u_int esp_trans_deflev, esp_net_deflev;
1555: u_int ah_trans_deflev, ah_net_deflev;
1556:
1557: IPSEC_ASSERT(isr != NULL && isr->sp != NULL,
1558: ("ipsec_get_reqlevel: null argument"));
1559: IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family,
1560: ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u",
1561: isr->sp->spidx.src.sa.sa_family,
1562: isr->sp->spidx.dst.sa.sa_family));
1563:
1564: /* XXX note that we have ipseclog() expanded here - code sync issue */
1565: #define IPSEC_CHECK_DEFAULT(lev) \
1.26 degroote 1566: (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \
1567: && (lev) != IPSEC_LEVEL_UNIQUE) \
1568: ? (ipsec_debug \
1.1 jonathan 1569: ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\
1.26 degroote 1570: (lev), IPSEC_LEVEL_REQUIRE) \
1571: : 0), \
1572: (lev) = IPSEC_LEVEL_REQUIRE, \
1573: (lev) \
1.1 jonathan 1574: : (lev))
1575:
1576: /* set default level */
1577: switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) {
1578: #ifdef INET
1579: case AF_INET:
1580: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev);
1581: esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev);
1582: ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev);
1583: ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev);
1584: break;
1585: #endif
1586: #ifdef INET6
1587: case AF_INET6:
1588: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev);
1589: esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev);
1590: ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev);
1591: ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev);
1592: break;
1593: #endif /* INET6 */
1594: default:
1595: panic("key_get_reqlevel: unknown af %u",
1.26 degroote 1596: isr->sp->spidx.src.sa.sa_family);
1.1 jonathan 1597: }
1598:
1599: #undef IPSEC_CHECK_DEFAULT
1600:
1601: /* set level */
1602: switch (isr->level) {
1603: case IPSEC_LEVEL_DEFAULT:
1604: switch (isr->saidx.proto) {
1605: case IPPROTO_ESP:
1606: if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1607: level = esp_net_deflev;
1608: else
1609: level = esp_trans_deflev;
1610: break;
1611: case IPPROTO_AH:
1612: if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
1613: level = ah_net_deflev;
1614: else
1615: level = ah_trans_deflev;
1.14 jonathan 1616: break;
1.1 jonathan 1617: case IPPROTO_IPCOMP:
1618: /*
1619: * we don't really care, as IPcomp document says that
1620: * we shouldn't compress small packets
1621: */
1622: level = IPSEC_LEVEL_USE;
1623: break;
1624: default:
1.16 christos 1625: panic("ipsec_get_reqlevel: Illegal protocol defined %u",
1.26 degroote 1626: isr->saidx.proto);
1.1 jonathan 1627: }
1628: break;
1629:
1630: case IPSEC_LEVEL_USE:
1631: case IPSEC_LEVEL_REQUIRE:
1632: level = isr->level;
1633: break;
1634: case IPSEC_LEVEL_UNIQUE:
1635: level = IPSEC_LEVEL_REQUIRE;
1636: break;
1637:
1638: default:
1.16 christos 1639: panic("ipsec_get_reqlevel: Illegal IPsec level %u",
1.1 jonathan 1640: isr->level);
1641: }
1642:
1643: return level;
1644: }
1645:
1646: /*
1647: * Check security policy requirements against the actual
1648: * packet contents. Return one if the packet should be
1649: * reject as "invalid"; otherwiser return zero to have the
1650: * packet treated as "valid".
1651: *
1652: * OUT:
1653: * 0: valid
1654: * 1: invalid
1655: */
1656: int
1657: ipsec_in_reject(struct secpolicy *sp, struct mbuf *m)
1658: {
1659: struct ipsecrequest *isr;
1660: int need_auth;
1661:
1662: KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1663: printf("ipsec_in_reject: using SP\n");
1664: kdebug_secpolicy(sp));
1665:
1666: /* check policy */
1667: switch (sp->policy) {
1668: case IPSEC_POLICY_DISCARD:
1669: return 1;
1670: case IPSEC_POLICY_BYPASS:
1671: case IPSEC_POLICY_NONE:
1672: return 0;
1673: }
1674:
1675: IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1676: ("ipsec_in_reject: invalid policy %u", sp->policy));
1677:
1678: /* XXX should compare policy against ipsec header history */
1679:
1680: need_auth = 0;
1681: for (isr = sp->req; isr != NULL; isr = isr->next) {
1682: if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE)
1683: continue;
1684: switch (isr->saidx.proto) {
1685: case IPPROTO_ESP:
1686: if ((m->m_flags & M_DECRYPTED) == 0) {
1687: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1.26 degroote 1688: printf("ipsec_in_reject: ESP m_flags:%x\n",
1689: m->m_flags));
1.1 jonathan 1690: return 1;
1691: }
1692:
1693: if (!need_auth &&
1.26 degroote 1694: isr->sav != NULL &&
1695: isr->sav->tdb_authalgxform != NULL &&
1696: (m->m_flags & M_AUTHIPDGM) == 0) {
1.1 jonathan 1697: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1.26 degroote 1698: printf("ipsec_in_reject: ESP/AH m_flags:%x\n",
1699: m->m_flags));
1.1 jonathan 1700: return 1;
1701: }
1702: break;
1703: case IPPROTO_AH:
1704: need_auth = 1;
1705: if ((m->m_flags & M_AUTHIPHDR) == 0) {
1706: KEYDEBUG(KEYDEBUG_IPSEC_DUMP,
1.26 degroote 1707: printf("ipsec_in_reject: AH m_flags:%x\n",
1708: m->m_flags));
1.1 jonathan 1709: return 1;
1710: }
1711: break;
1712: case IPPROTO_IPCOMP:
1713: /*
1714: * we don't really care, as IPcomp document
1715: * says that we shouldn't compress small
1716: * packets, IPComp policy should always be
1717: * treated as being in "use" level.
1718: */
1719: break;
1720: }
1721: }
1722: return 0; /* valid */
1723: }
1724:
1725: /*
1726: * Check AH/ESP integrity.
1727: * This function is called from tcp_input(), udp_input(),
1728: * and {ah,esp}4_input for tunnel mode
1729: */
1730: int
1731: ipsec4_in_reject(m, inp)
1732: struct mbuf *m;
1733: struct inpcb *inp;
1734: {
1735: struct secpolicy *sp;
1736: int error;
1737: int result;
1738:
1739: IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf"));
1740:
1741: /* get SP for this packet.
1742: * When we are called from ip_forward(), we call
1743: * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1744: */
1745: if (inp == NULL)
1746: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1747: else
1.5 jonathan 1748: sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1749: IN4PCB_TO_PCB(inp), &error);
1.1 jonathan 1750:
1751: if (sp != NULL) {
1752: result = ipsec_in_reject(sp, m);
1753: if (result)
1754: newipsecstat.ips_in_polvio++;
1755: KEY_FREESP(&sp);
1756: } else {
1757: result = 0; /* XXX should be panic ?
1758: * -> No, there may be error. */
1759: }
1760: return result;
1761: }
1762:
1763:
1764: #ifdef INET6
1765: /*
1766: * Check AH/ESP integrity.
1767: * This function is called from tcp6_input(), udp6_input(),
1768: * and {ah,esp}6_input for tunnel mode
1769: */
1770: int
1.5 jonathan 1771: ipsec6_in_reject(m, in6p)
1.1 jonathan 1772: struct mbuf *m;
1.5 jonathan 1773: struct in6pcb *in6p;
1.1 jonathan 1774: {
1775: struct secpolicy *sp = NULL;
1776: int error;
1777: int result;
1778:
1779: /* sanity check */
1780: if (m == NULL)
1781: return 0; /* XXX should be panic ? */
1782:
1783: /* get SP for this packet.
1784: * When we are called from ip_forward(), we call
1785: * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1786: */
1.5 jonathan 1787: if (in6p == NULL)
1.1 jonathan 1788: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error);
1789: else
1.5 jonathan 1790: sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND,
1791: IN6PCB_TO_PCB(in6p),
1792: &error);
1.1 jonathan 1793:
1794: if (sp != NULL) {
1795: result = ipsec_in_reject(sp, m);
1796: if (result)
1797: newipsecstat.ips_in_polvio++;
1798: KEY_FREESP(&sp);
1799: } else {
1800: result = 0;
1801: }
1802: return result;
1803: }
1804: #endif
1805:
1806: /*
1807: * compute the byte size to be occupied by IPsec header.
1808: * in case it is tunneled, it includes the size of outer IP header.
1809: * NOTE: SP passed is free in this function.
1810: */
1811: static size_t
1812: ipsec_hdrsiz(struct secpolicy *sp)
1813: {
1814: struct ipsecrequest *isr;
1815: size_t siz;
1816:
1817: KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1818: printf("ipsec_hdrsiz: using SP\n");
1819: kdebug_secpolicy(sp));
1820:
1821: switch (sp->policy) {
1822: case IPSEC_POLICY_DISCARD:
1823: case IPSEC_POLICY_BYPASS:
1824: case IPSEC_POLICY_NONE:
1825: return 0;
1826: }
1827:
1828: IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC,
1829: ("ipsec_hdrsiz: invalid policy %u", sp->policy));
1830:
1831: siz = 0;
1832: for (isr = sp->req; isr != NULL; isr = isr->next) {
1833: size_t clen = 0;
1834:
1835: switch (isr->saidx.proto) {
1836: case IPPROTO_ESP:
1837: clen = esp_hdrsiz(isr->sav);
1838: break;
1839: case IPPROTO_AH:
1840: clen = ah_hdrsiz(isr->sav);
1841: break;
1842: case IPPROTO_IPCOMP:
1843: clen = sizeof(struct ipcomp);
1844: break;
1845: }
1846:
1847: if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
1848: switch (isr->saidx.dst.sa.sa_family) {
1849: case AF_INET:
1850: clen += sizeof(struct ip);
1851: break;
1852: #ifdef INET6
1853: case AF_INET6:
1854: clen += sizeof(struct ip6_hdr);
1855: break;
1856: #endif
1857: default:
1858: ipseclog((LOG_ERR, "ipsec_hdrsiz: "
1.26 degroote 1859: "unknown AF %d in IPsec tunnel SA\n",
1860: ((struct sockaddr *)&isr->saidx.dst)->sa_family));
1.1 jonathan 1861: break;
1862: }
1863: }
1864: siz += clen;
1865: }
1866:
1867: return siz;
1868: }
1869:
1870: /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */
1871: size_t
1872: ipsec4_hdrsiz(m, dir, inp)
1873: struct mbuf *m;
1874: u_int dir;
1875: struct inpcb *inp;
1876: {
1877: struct secpolicy *sp;
1878: int error;
1879: size_t size;
1880:
1881: IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf"));
1882: IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL,
1883: ("ipsec4_hdrsize: socket w/o inpcb"));
1884:
1885: /* get SP for this packet.
1886: * When we are called from ip_forward(), we call
1887: * ipsec_getpolicybyaddr() with IP_FORWARDING flag.
1888: */
1889: if (inp == NULL)
1890: sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1891: else
1.5 jonathan 1892: sp = ipsec_getpolicybysock(m, dir,
1893: IN4PCB_TO_PCB(inp), &error);
1.1 jonathan 1894:
1895: if (sp != NULL) {
1896: size = ipsec_hdrsiz(sp);
1897: KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1898: printf("ipsec4_hdrsiz: size:%lu.\n",
1899: (unsigned long)size));
1900:
1901: KEY_FREESP(&sp);
1902: } else {
1903: size = 0; /* XXX should be panic ? */
1904: }
1905: return size;
1906: }
1907:
1908: #ifdef INET6
1909: /* This function is called from ipsec6_hdrsize_tcp(),
1910: * and maybe from ip6_forward.()
1911: */
1912: size_t
1913: ipsec6_hdrsiz(m, dir, in6p)
1914: struct mbuf *m;
1915: u_int dir;
1916: struct in6pcb *in6p;
1917: {
1918: struct secpolicy *sp;
1919: int error;
1920: size_t size;
1921:
1922: IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf"));
1923: IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL,
1924: ("ipsec6_hdrsize: socket w/o inpcb"));
1925:
1926: /* get SP for this packet */
1927: /* XXX Is it right to call with IP_FORWARDING. */
1928: if (in6p == NULL)
1929: sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error);
1930: else
1.15 perry 1931: sp = ipsec_getpolicybysock(m, dir,
1.5 jonathan 1932: IN6PCB_TO_PCB(in6p),
1933: &error);
1.1 jonathan 1934:
1935: if (sp == NULL)
1936: return 0;
1937: size = ipsec_hdrsiz(sp);
1938: KEYDEBUG(KEYDEBUG_IPSEC_DATA,
1939: printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size));
1940: KEY_FREESP(&sp);
1941:
1942: return size;
1943: }
1944: #endif /*INET6*/
1945:
1946: /*
1947: * Check the variable replay window.
1948: * ipsec_chkreplay() performs replay check before ICV verification.
1949: * ipsec_updatereplay() updates replay bitmap. This must be called after
1950: * ICV verification (it also performs replay check, which is usually done
1951: * beforehand).
1952: * 0 (zero) is returned if packet disallowed, 1 if packet permitted.
1953: *
1954: * based on RFC 2401.
1955: */
1956: int
1957: ipsec_chkreplay(seq, sav)
1958: u_int32_t seq;
1959: struct secasvar *sav;
1960: {
1961: const struct secreplay *replay;
1962: u_int32_t diff;
1963: int fr;
1964: u_int32_t wsizeb; /* constant: bits of window size */
1965: int frlast; /* constant: last frame */
1966:
1967: IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay");
1968:
1969: IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA"));
1970: IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state"));
1971:
1972: replay = sav->replay;
1973:
1974: if (replay->wsize == 0)
1975: return 1; /* no need to check replay. */
1976:
1977: /* constant */
1978: frlast = replay->wsize - 1;
1979: wsizeb = replay->wsize << 3;
1980:
1981: /* sequence number of 0 is invalid */
1982: if (seq == 0)
1983: return 0;
1984:
1985: /* first time is always okay */
1986: if (replay->count == 0)
1987: return 1;
1988:
1989: if (seq > replay->lastseq) {
1990: /* larger sequences are okay */
1991: return 1;
1992: } else {
1993: /* seq is equal or less than lastseq. */
1994: diff = replay->lastseq - seq;
1995:
1996: /* over range to check, i.e. too old or wrapped */
1997: if (diff >= wsizeb)
1998: return 0;
1999:
2000: fr = frlast - diff / 8;
2001:
2002: /* this packet already seen ? */
2003: if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2004: return 0;
2005:
2006: /* out of order but good */
2007: return 1;
2008: }
2009: }
2010:
2011: /*
2012: * check replay counter whether to update or not.
2013: * OUT: 0: OK
2014: * 1: NG
2015: */
2016: int
2017: ipsec_updatereplay(seq, sav)
2018: u_int32_t seq;
2019: struct secasvar *sav;
2020: {
2021: struct secreplay *replay;
2022: u_int32_t diff;
2023: int fr;
2024: u_int32_t wsizeb; /* constant: bits of window size */
2025: int frlast; /* constant: last frame */
2026:
2027: IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay");
2028:
2029: IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA"));
2030: IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state"));
2031:
2032: replay = sav->replay;
2033:
2034: if (replay->wsize == 0)
2035: goto ok; /* no need to check replay. */
2036:
2037: /* constant */
2038: frlast = replay->wsize - 1;
2039: wsizeb = replay->wsize << 3;
2040:
2041: /* sequence number of 0 is invalid */
2042: if (seq == 0)
2043: return 1;
2044:
2045: /* first time */
2046: if (replay->count == 0) {
2047: replay->lastseq = seq;
2048: bzero(replay->bitmap, replay->wsize);
2049: (replay->bitmap)[frlast] = 1;
2050: goto ok;
2051: }
2052:
2053: if (seq > replay->lastseq) {
2054: /* seq is larger than lastseq. */
2055: diff = seq - replay->lastseq;
2056:
2057: /* new larger sequence number */
2058: if (diff < wsizeb) {
2059: /* In window */
2060: /* set bit for this packet */
2061: vshiftl(replay->bitmap, diff, replay->wsize);
2062: (replay->bitmap)[frlast] |= 1;
2063: } else {
2064: /* this packet has a "way larger" */
2065: bzero(replay->bitmap, replay->wsize);
2066: (replay->bitmap)[frlast] = 1;
2067: }
2068: replay->lastseq = seq;
2069:
2070: /* larger is good */
2071: } else {
2072: /* seq is equal or less than lastseq. */
2073: diff = replay->lastseq - seq;
2074:
2075: /* over range to check, i.e. too old or wrapped */
2076: if (diff >= wsizeb)
2077: return 1;
2078:
2079: fr = frlast - diff / 8;
2080:
2081: /* this packet already seen ? */
2082: if ((replay->bitmap)[fr] & (1 << (diff % 8)))
2083: return 1;
2084:
2085: /* mark as seen */
2086: (replay->bitmap)[fr] |= (1 << (diff % 8));
2087:
2088: /* out of order but good */
2089: }
2090:
2091: ok:
2092: if (replay->count == ~0) {
2093:
2094: /* set overflow flag */
2095: replay->overflow++;
2096:
2097: /* don't increment, no more packets accepted */
2098: if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0)
2099: return 1;
2100:
2101: ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n",
1.26 degroote 2102: replay->overflow, ipsec_logsastr(sav)));
1.1 jonathan 2103: }
2104:
2105: replay->count++;
2106:
2107: return 0;
2108: }
2109:
2110: /*
2111: * shift variable length bunffer to left.
2112: * IN: bitmap: pointer to the buffer
2113: * nbit: the number of to shift.
2114: * wsize: buffer size (bytes).
2115: */
2116: static void
2117: vshiftl(bitmap, nbit, wsize)
2118: unsigned char *bitmap;
2119: int nbit, wsize;
2120: {
2121: int s, j, i;
2122: unsigned char over;
2123:
2124: for (j = 0; j < nbit; j += 8) {
2125: s = (nbit - j < 8) ? (nbit - j): 8;
2126: bitmap[0] <<= s;
2127: for (i = 1; i < wsize; i++) {
2128: over = (bitmap[i] >> (8 - s));
2129: bitmap[i] <<= s;
2130: bitmap[i-1] |= over;
2131: }
2132: }
2133:
2134: return;
2135: }
2136:
2137: /* Return a printable string for the IPv4 address. */
2138: static char *
2139: inet_ntoa4(struct in_addr ina)
2140: {
2141: static char buf[4][4 * sizeof "123" + 4];
2142: unsigned char *ucp = (unsigned char *) &ina;
2143: static int i = 3;
2144:
2145: i = (i + 1) % 4;
1.11 itojun 2146: snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d",
1.26 degroote 2147: ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff);
1.1 jonathan 2148: return (buf[i]);
2149: }
2150:
2151: /* Return a printable string for the address. */
1.17 christos 2152: const char *
1.1 jonathan 2153: ipsec_address(union sockaddr_union* sa)
2154: {
2155: switch (sa->sa.sa_family) {
2156: #if INET
2157: case AF_INET:
2158: return inet_ntoa4(sa->sin.sin_addr);
2159: #endif /* INET */
2160:
2161: #if INET6
2162: case AF_INET6:
2163: return ip6_sprintf(&sa->sin6.sin6_addr);
2164: #endif /* INET6 */
2165:
2166: default:
2167: return "(unknown address family)";
2168: }
2169: }
2170:
2171: const char *
2172: ipsec_logsastr(sav)
2173: struct secasvar *sav;
2174: {
2175: static char buf[256];
2176: char *p;
2177: struct secasindex *saidx = &sav->sah->saidx;
2178:
2179: IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family,
2180: ("ipsec_logsastr: address family mismatch"));
2181:
2182: p = buf;
2183: snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi));
2184: while (p && *p)
2185: p++;
2186: /* NB: only use ipsec_address on one address at a time */
2187: snprintf(p, sizeof (buf) - (p - buf), "src=%s ",
2188: ipsec_address(&saidx->src));
2189: while (p && *p)
2190: p++;
2191: snprintf(p, sizeof (buf) - (p - buf), "dst=%s)",
2192: ipsec_address(&saidx->dst));
2193:
2194: return buf;
2195: }
2196:
2197: void
2198: ipsec_dumpmbuf(m)
2199: struct mbuf *m;
2200: {
2201: int totlen;
2202: int i;
2203: u_char *p;
2204:
2205: totlen = 0;
2206: printf("---\n");
2207: while (m) {
2208: p = mtod(m, u_char *);
2209: for (i = 0; i < m->m_len; i++) {
2210: printf("%02x ", p[i]);
2211: totlen++;
2212: if (totlen % 16 == 0)
2213: printf("\n");
2214: }
2215: m = m->m_next;
2216: }
2217: if (totlen % 16 != 0)
2218: printf("\n");
2219: printf("---\n");
2220: }
2221:
1.26 degroote 2222: #ifdef INET6
2223: struct secpolicy *
2224: ipsec6_check_policy(m,so,flags,needipsecp,errorp)
2225: struct mbuf * m;
2226: const struct socket * so;
2227: int flags;
2228: int * needipsecp;
2229: int * errorp;
2230: {
2231: struct in6pcb *in6p = NULL;
2232: struct m_tag *mtag;
2233: struct secpolicy *sp = NULL;
2234: struct tdb_ident *tdbi;
2235: int s;
2236: int error = 0;
2237: int needipsec = 0;
2238:
2239: if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6)
2240: in6p = sotoin6pcb(so);
2241:
2242: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
2243: s = splsoftnet();
2244: if (mtag != NULL) {
2245: tdbi = (struct tdb_ident *)(mtag + 1);
2246: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_OUTBOUND);
2247: if (sp == NULL)
2248: error = -EINVAL; /* force silent drop */
2249: m_tag_delete(m, mtag);
2250: } else {
2251: if (in6p != NULL &&
2252: IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND))
2253: goto skippolicycheck;
2254: sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p);
2255: }
2256:
2257: /*
2258: * There are four return cases:
2259: * sp != NULL apply IPsec policy
2260: * sp == NULL, error == 0 no IPsec handling needed
2261: * sp == NULL, error == -EINVAL discard packet w/o error
2262: * sp == NULL, error != 0 discard packet, report error
2263: */
2264:
2265: if (sp == NULL) {
2266: splx(s);
2267:
2268: if (error != 0) {
2269: needipsec = 0;
2270: } else {
2271: /* No IPsec processing for this packet. */
2272: needipsec = 0;
2273: }
2274: } else {
2275: /* Loop detection, check if ipsec processing already done */
2276: IPSEC_ASSERT(sp->req != NULL, ("ip6_output: no ipsec request"));
2277: for (mtag = m_tag_first(m); mtag != NULL;
2278: mtag = m_tag_next(m, mtag)) {
2279: #ifdef MTAG_ABI_COMPAT
2280: if (mtag->m_tag_cookie != MTAG_ABI_COMPAT)
2281: continue;
2282: #endif
2283: if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE &&
2284: mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED)
2285: continue;
2286: /*
2287: * Check if policy has an SA associated with it.
2288: * This can happen when an SP has yet to acquire
2289: * an SA; e.g. on first reference. If it occurs,
2290: * then we let ipsec4_process_packet do its thing.
2291: */
2292: if (sp->req->sav == NULL)
2293: break;
2294: tdbi = (struct tdb_ident *)(mtag + 1);
2295: if (tdbi->spi == sp->req->sav->spi &&
2296: tdbi->proto == sp->req->sav->sah->saidx.proto &&
2297: bcmp(&tdbi->dst, &sp->req->sav->sah->saidx.dst,
2298: sizeof (union sockaddr_union)) == 0) {
2299: /*
2300: * No IPsec processing is needed, free
2301: * reference to SP.
2302: *
2303: * NB: null pointer to avoid free at
2304: * done: below.
2305: */
2306: KEY_FREESP(&sp), sp = NULL;
2307: needipsec = 0;
2308: splx(s);
2309: goto skippolicycheck;
2310: }
2311: }
2312: splx(s);
2313: needipsec = 1;
2314: }
2315: skippolicycheck:;
2316:
2317: *errorp = error;
2318: *needipsecp = needipsec;
2319: return sp;
2320: }
2321: #endif
2322:
2323:
2324:
1.1 jonathan 2325: /* XXX this stuff doesn't belong here... */
2326:
2327: static struct xformsw* xforms = NULL;
2328:
2329: /*
2330: * Register a transform; typically at system startup.
2331: */
2332: void
2333: xform_register(struct xformsw* xsp)
2334: {
2335: xsp->xf_next = xforms;
2336: xforms = xsp;
2337: }
2338:
2339: /*
2340: * Initialize transform support in an sav.
2341: */
2342: int
2343: xform_init(struct secasvar *sav, int xftype)
2344: {
2345: struct xformsw *xsp;
2346:
2347: if (sav->tdb_xform != NULL) /* previously initialized */
2348: return 0;
2349: for (xsp = xforms; xsp; xsp = xsp->xf_next)
2350: if (xsp->xf_type == xftype)
2351: return (*xsp->xf_init)(sav, xsp);
2352:
2353: DPRINTF(("xform_init: no match for xform type %d\n", xftype));
2354: return EINVAL;
2355: }
2356:
2357: #ifdef __NetBSD__
2358: void
2359: ipsec_attach(void)
2360: {
2361: printf("initializing IPsec...");
2362: ah_attach();
2363: esp_attach();
2364: ipcomp_attach();
2365: ipe4_attach();
1.12 jonathan 2366: #ifdef TCP_SIGNATURE
2367: tcpsignature_attach();
2368: #endif
1.1 jonathan 2369: printf(" done\n");
2370: }
2371: #endif /* __NetBSD__ */
CVSweb <webmaster@jp.NetBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to ipsec.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [cvs.NetBSD.org] / src / sys / netipsec