ipsec_output.c revision 1.5 1 /* $NetBSD: ipsec_output.c,v 1.5 2003/08/22 21:53:10 itojun Exp $ */
2 /* $FreeBSD: src/sys/netipsec/ipsec_output.c,v 1.3.2.1 2003/01/24 05:11:35 sam Exp $ */
3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
4
5 #include <sys/cdefs.h>
6 __KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.5 2003/08/22 21:53:10 itojun Exp $");
7
8 /*
9 * IPsec output processing.
10 */
11 #include "opt_inet.h"
12 #ifdef __FreeBSD__
13 #include "opt_inet6.h"
14 #endif
15 #include "opt_ipsec.h"
16
17 #include <sys/param.h>
18 #include <sys/systm.h>
19 #include <sys/mbuf.h>
20 #include <sys/domain.h>
21 #include <sys/protosw.h>
22 #include <sys/socket.h>
23 #include <sys/errno.h>
24 #include <sys/syslog.h>
25
26 #include <net/if.h>
27 #include <net/route.h>
28
29 #include <netinet/in.h>
30 #include <netinet/in_systm.h>
31 #include <netinet/ip.h>
32 #include <netinet/ip_var.h>
33 #include <netinet/in_var.h>
34 #include <netinet/ip_ecn.h>
35 #ifdef INET6
36 #include <netinet6/ip6_ecn.h>
37 #endif
38
39 #include <netinet/ip6.h>
40 #ifdef INET6
41 #include <netinet6/ip6_var.h>
42 #endif
43 #include <netinet/in_pcb.h>
44 #ifdef INET6
45 #include <netinet/icmp6.h>
46 #endif
47
48 #include <netipsec/ipsec.h>
49 #ifdef INET6
50 #include <netipsec/ipsec6.h>
51 #endif
52 #include <netipsec/ah_var.h>
53 #include <netipsec/esp_var.h>
54 #include <netipsec/ipcomp_var.h>
55
56 #include <netipsec/xform.h>
57
58 #include <netipsec/key.h>
59 #include <netipsec/keydb.h>
60 #include <netipsec/key_debug.h>
61 #include <netipsec/ipsec_osdep.h>
62
63 int
64 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
65 {
66 struct tdb_ident *tdbi;
67 struct m_tag *mtag;
68 struct secasvar *sav;
69 struct secasindex *saidx;
70 int error;
71
72 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done");
73
74 IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf"));
75 IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR"));
76 sav = isr->sav;
77 IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA"));
78 IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH"));
79
80 saidx = &sav->sah->saidx;
81 switch (saidx->dst.sa.sa_family) {
82 #ifdef INET
83 case AF_INET:
84 /* Fix the header length, for AH processing. */
85 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
86 break;
87 #endif /* INET */
88 #ifdef INET6
89 case AF_INET6:
90 /* Fix the header length, for AH processing. */
91 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
92 error = ENXIO;
93 goto bad;
94 }
95 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
96 /* No jumbogram support. */
97 error = ENXIO; /*?*/
98 goto bad;
99 }
100 mtod(m, struct ip6_hdr *)->ip6_plen =
101 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
102 break;
103 #endif /* INET6 */
104 default:
105 DPRINTF(("ipsec_process_done: unknown protocol family %u\n",
106 saidx->dst.sa.sa_family));
107 error = ENXIO;
108 goto bad;
109 }
110
111 /*
112 * Add a record of what we've done or what needs to be done to the
113 * packet.
114 */
115 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
116 sizeof(struct tdb_ident), M_NOWAIT);
117 if (mtag == NULL) {
118 DPRINTF(("ipsec_process_done: could not get packet tag\n"));
119 error = ENOMEM;
120 goto bad;
121 }
122
123 tdbi = (struct tdb_ident *)(mtag + 1);
124 tdbi->dst = saidx->dst;
125 tdbi->proto = saidx->proto;
126 tdbi->spi = sav->spi;
127 m_tag_prepend(m, mtag);
128
129 /*
130 * If there's another (bundled) SA to apply, do so.
131 * Note that this puts a burden on the kernel stack size.
132 * If this is a problem we'll need to introduce a queue
133 * to set the packet on so we can unwind the stack before
134 * doing further processing.
135 */
136 if (isr->next) {
137 newipsecstat.ips_out_bundlesa++;
138 return ipsec4_process_packet(m, isr->next, 0, 0);
139 }
140
141 /*
142 * We're done with IPsec processing, transmit the packet using the
143 * appropriate network protocol (IP or IPv6). SPD lookup will be
144 * performed again there.
145 */
146 switch (saidx->dst.sa.sa_family) {
147 #ifdef INET
148 struct ip *ip;
149 case AF_INET:
150 ip = mtod(m, struct ip *);
151 #ifdef __FreeBSD__
152 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */
153 ip->ip_len = ntohs(ip->ip_len);
154 ip->ip_off = ntohs(ip->ip_off);
155 #endif /* __FreeBSD_ */
156 return ip_output(m, NULL, NULL, IP_RAWOUTPUT,
157 (struct ip_moptions *)NULL, (struct socket *)NULL);
158
159 #endif /* INET */
160 #ifdef INET6
161 case AF_INET6:
162 /*
163 * We don't need massage, IPv6 header fields are always in
164 * net endian.
165 */
166 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
167 #endif /* INET6 */
168 }
169 panic("ipsec_process_done");
170 bad:
171 m_freem(m);
172 KEY_FREESAV(&sav);
173 return (error);
174 }
175
176 static struct ipsecrequest *
177 ipsec_nextisr(
178 struct mbuf *m,
179 struct ipsecrequest *isr,
180 int af,
181 struct secasindex *saidx,
182 int *error
183 )
184 {
185 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
186 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
187 struct secasvar *sav;
188
189 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr");
190 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
191 ("ipsec_nextisr: invalid address family %u", af));
192 again:
193 /*
194 * Craft SA index to search for proper SA. Note that
195 * we only fillin unspecified SA peers for transport
196 * mode; for tunnel mode they must already be filled in.
197 */
198 *saidx = isr->saidx;
199 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
200 /* Fillin unspecified SA peers only for transport mode */
201 if (af == AF_INET) {
202 struct sockaddr_in *sin;
203 struct ip *ip = mtod(m, struct ip *);
204
205 if (saidx->src.sa.sa_len == 0) {
206 sin = &saidx->src.sin;
207 sin->sin_len = sizeof(*sin);
208 sin->sin_family = AF_INET;
209 sin->sin_port = IPSEC_PORT_ANY;
210 sin->sin_addr = ip->ip_src;
211 }
212 if (saidx->dst.sa.sa_len == 0) {
213 sin = &saidx->dst.sin;
214 sin->sin_len = sizeof(*sin);
215 sin->sin_family = AF_INET;
216 sin->sin_port = IPSEC_PORT_ANY;
217 sin->sin_addr = ip->ip_dst;
218 }
219 } else {
220 struct sockaddr_in6 *sin6;
221 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
222
223 if (saidx->src.sin6.sin6_len == 0) {
224 sin6 = (struct sockaddr_in6 *)&saidx->src;
225 sin6->sin6_len = sizeof(*sin6);
226 sin6->sin6_family = AF_INET6;
227 sin6->sin6_port = IPSEC_PORT_ANY;
228 sin6->sin6_addr = ip6->ip6_src;
229 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
230 /* fix scope id for comparing SPD */
231 sin6->sin6_addr.s6_addr16[1] = 0;
232 sin6->sin6_scope_id =
233 ntohs(ip6->ip6_src.s6_addr16[1]);
234 }
235 }
236 if (saidx->dst.sin6.sin6_len == 0) {
237 sin6 = (struct sockaddr_in6 *)&saidx->dst;
238 sin6->sin6_len = sizeof(*sin6);
239 sin6->sin6_family = AF_INET6;
240 sin6->sin6_port = IPSEC_PORT_ANY;
241 sin6->sin6_addr = ip6->ip6_dst;
242 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
243 /* fix scope id for comparing SPD */
244 sin6->sin6_addr.s6_addr16[1] = 0;
245 sin6->sin6_scope_id =
246 ntohs(ip6->ip6_dst.s6_addr16[1]);
247 }
248 }
249 }
250 }
251
252 /*
253 * Lookup SA and validate it.
254 */
255 *error = key_checkrequest(isr, saidx);
256 if (*error != 0) {
257 /*
258 * IPsec processing is required, but no SA found.
259 * I assume that key_acquire() had been called
260 * to get/establish the SA. Here I discard
261 * this packet because it is responsibility for
262 * upper layer to retransmit the packet.
263 */
264 newipsecstat.ips_out_nosa++;
265 goto bad;
266 }
267 sav = isr->sav;
268 if (sav == NULL) { /* XXX valid return */
269 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
270 ("ipsec_nextisr: no SA found, but required; level %u",
271 ipsec_get_reqlevel(isr)));
272 isr = isr->next;
273 if (isr == NULL) {
274 /*XXXstatistic??*/
275 *error = EINVAL; /*XXX*/
276 return isr;
277 }
278 goto again;
279 }
280
281 /*
282 * Check system global policy controls.
283 */
284 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
285 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
286 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
287 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due"
288 " to policy (check your sysctls)\n"));
289 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
290 ipcompstat.ipcomps_pdrops);
291 *error = EHOSTUNREACH;
292 goto bad;
293 }
294
295 /*
296 * Sanity check the SA contents for the caller
297 * before they invoke the xform output method.
298 */
299 if (sav->tdb_xform == NULL) {
300 DPRINTF(("ipsec_nextisr: no transform for SA\n"));
301 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
302 ipcompstat.ipcomps_noxform);
303 *error = EHOSTUNREACH;
304 goto bad;
305 }
306 return isr;
307 bad:
308 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code"));
309 return NULL;
310 #undef IPSEC_OSTAT
311 }
312
313 #ifdef INET
314 /*
315 * IPsec output logic for IPv4.
316 */
317 int
318 ipsec4_process_packet(
319 struct mbuf *m,
320 struct ipsecrequest *isr,
321 int flags,
322 int tunalready)
323 {
324 struct secasindex saidx;
325 struct secasvar *sav;
326 struct ip *ip;
327 int s, error, i, off;
328
329 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf"));
330 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr"));
331
332 s = splsoftnet(); /* insure SA contents don't change */
333
334 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
335 if (isr == NULL)
336 goto bad;
337
338 sav = isr->sav;
339 if (!tunalready) {
340 union sockaddr_union *dst = &sav->sah->saidx.dst;
341 int setdf;
342
343 /*
344 * Collect IP_DF state from the outer header.
345 */
346 if (dst->sa.sa_family == AF_INET) {
347 if (m->m_len < sizeof (struct ip) &&
348 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
349 error = ENOBUFS;
350 goto bad;
351 }
352 ip = mtod(m, struct ip *);
353 /* Honor system-wide control of how to handle IP_DF */
354 switch (ip4_ipsec_dfbit) {
355 case 0: /* clear in outer header */
356 case 1: /* set in outer header */
357 setdf = ip4_ipsec_dfbit;
358 break;
359 default: /* propagate to outer header */
360 setdf = ip->ip_off;
361 #ifndef __FreeBSD__
362 /* On FreeBSD, ip_off and ip_len assumed in host endian. */
363 setdf = ntohs(setdf);
364 #endif
365 setdf = htons(setdf & IP_DF);
366 break;
367 }
368 } else {
369 ip = NULL; /* keep compiler happy */
370 setdf = 0;
371 }
372 /* Do the appropriate encapsulation, if necessary */
373 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
374 dst->sa.sa_family != AF_INET || /* PF mismatch */
375 #if 0
376 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
377 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
378 #endif
379 (dst->sa.sa_family == AF_INET && /* Proxy */
380 dst->sin.sin_addr.s_addr != INADDR_ANY &&
381 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
382 struct mbuf *mp;
383
384 /* Fix IPv4 header checksum and length */
385 if (m->m_len < sizeof (struct ip) &&
386 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
387 error = ENOBUFS;
388 goto bad;
389 }
390 ip = mtod(m, struct ip *);
391 ip->ip_len = htons(m->m_pkthdr.len);
392 ip->ip_sum = 0;
393 #ifdef _IP_VHL
394 if (ip->ip_vhl == IP_VHL_BORING)
395 ip->ip_sum = in_cksum_hdr(ip);
396 else
397 ip->ip_sum = in_cksum(m,
398 _IP_VHL_HL(ip->ip_vhl) << 2);
399 #else
400 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
401 #endif
402
403 /* Encapsulate the packet */
404 error = ipip_output(m, isr, &mp, 0, 0);
405 if (mp == NULL && !error) {
406 /* Should never happen. */
407 DPRINTF(("ipsec4_process_packet: ipip_output "
408 "returns no mbuf and no error!"));
409 error = EFAULT;
410 }
411 if (error) {
412 if (mp)
413 m_freem(mp);
414 goto bad;
415 }
416 m = mp, mp = NULL;
417 /*
418 * ipip_output clears IP_DF in the new header. If
419 * we need to propagate IP_DF from the outer header,
420 * then we have to do it here.
421 *
422 * XXX shouldn't assume what ipip_output does.
423 */
424 if (dst->sa.sa_family == AF_INET && setdf) {
425 if (m->m_len < sizeof (struct ip) &&
426 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
427 error = ENOBUFS;
428 goto bad;
429 }
430 ip = mtod(m, struct ip *);
431 ip->ip_off = ntohs(ip->ip_off);
432 ip->ip_off |= IP_DF;
433 ip->ip_off = htons(ip->ip_off);
434 }
435 }
436 }
437
438 /*
439 * Dispatch to the appropriate IPsec transform logic. The
440 * packet will be returned for transmission after crypto
441 * processing, etc. are completed. For encapsulation we
442 * bypass this call because of the explicit call done above
443 * (necessary to deal with IP_DF handling for IPv4).
444 *
445 * NB: m & sav are ``passed to caller'' who's reponsible for
446 * for reclaiming their resources.
447 */
448 if (sav->tdb_xform->xf_type != XF_IP4) {
449 ip = mtod(m, struct ip *);
450 i = ip->ip_hl << 2;
451 off = offsetof(struct ip, ip_p);
452 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
453 } else {
454 error = ipsec_process_done(m, isr);
455 }
456 splx(s);
457 return error;
458 bad:
459 splx(s);
460 if (m)
461 m_freem(m);
462 return error;
463 }
464 #endif
465
466 #ifdef INET6
467 /*
468 * Chop IP6 header from the payload.
469 */
470 static struct mbuf *
471 ipsec6_splithdr(struct mbuf *m)
472 {
473 struct mbuf *mh;
474 struct ip6_hdr *ip6;
475 int hlen;
476
477 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
478 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len));
479 ip6 = mtod(m, struct ip6_hdr *);
480 hlen = sizeof(struct ip6_hdr);
481 if (m->m_len > hlen) {
482 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
483 if (!mh) {
484 m_freem(m);
485 return NULL;
486 }
487 M_MOVE_PKTHDR(mh, m);
488 MH_ALIGN(mh, hlen);
489 m->m_len -= hlen;
490 m->m_data += hlen;
491 mh->m_next = m;
492 m = mh;
493 m->m_len = hlen;
494 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
495 } else if (m->m_len < hlen) {
496 m = m_pullup(m, hlen);
497 if (!m)
498 return NULL;
499 }
500 return m;
501 }
502
503 /*
504 * IPsec output logic for IPv6, transport mode.
505 */
506 int
507 ipsec6_output_trans(
508 struct ipsec_output_state *state,
509 u_char *nexthdrp,
510 struct mbuf *mprev,
511 struct secpolicy *sp,
512 int flags,
513 int *tun)
514 {
515 struct ipsecrequest *isr;
516 struct secasindex saidx;
517 int error = 0;
518 struct mbuf *m;
519
520 IPSEC_ASSERT(state != NULL, ("ipsec6_output: null state"));
521 IPSEC_ASSERT(state->m != NULL, ("ipsec6_output: null m"));
522 IPSEC_ASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp"));
523 IPSEC_ASSERT(mprev != NULL, ("ipsec6_output: null mprev"));
524 IPSEC_ASSERT(sp != NULL, ("ipsec6_output: null sp"));
525 IPSEC_ASSERT(tun != NULL, ("ipsec6_output: null tun"));
526
527 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
528 printf("ipsec6_output_trans: applyed SP\n");
529 kdebug_secpolicy(sp));
530
531 isr = sp->req;
532 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
533 /* the rest will be handled by ipsec6_output_tunnel() */
534 *tun = 1; /* need tunnel-mode processing */
535 return 0;
536 }
537
538 *tun = 0;
539 m = state->m;
540
541 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
542 if (isr == NULL) {
543 #ifdef notdef
544 /* XXX should notification be done for all errors ? */
545 /*
546 * Notify the fact that the packet is discarded
547 * to ourselves. I believe this is better than
548 * just silently discarding. (jinmei (at) kame.net)
549 * XXX: should we restrict the error to TCP packets?
550 * XXX: should we directly notify sockets via
551 * pfctlinputs?
552 */
553 icmp6_error(m, ICMP6_DST_UNREACH,
554 ICMP6_DST_UNREACH_ADMIN, 0);
555 m = NULL; /* NB: icmp6_error frees mbuf */
556 #endif
557 goto bad;
558 }
559
560 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
561 sizeof (struct ip6_hdr),
562 offsetof(struct ip6_hdr, ip6_nxt));
563 bad:
564 if (m)
565 m_freem(m);
566 state->m = NULL;
567 return error;
568 }
569
570 static int
571 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
572 {
573 struct ip6_hdr *oip6;
574 struct ip6_hdr *ip6;
575 size_t plen;
576
577 /* can't tunnel between different AFs */
578 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
579 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
580 m_freem(m);
581 return EINVAL;
582 }
583 IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr),
584 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len));
585
586
587 /*
588 * grow the mbuf to accomodate the new IPv6 header.
589 */
590 plen = m->m_pkthdr.len;
591 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
592 struct mbuf *n;
593 MGET(n, M_DONTWAIT, MT_DATA);
594 if (!n) {
595 m_freem(m);
596 return ENOBUFS;
597 }
598 n->m_len = sizeof(struct ip6_hdr);
599 n->m_next = m->m_next;
600 m->m_next = n;
601 m->m_pkthdr.len += sizeof(struct ip6_hdr);
602 oip6 = mtod(n, struct ip6_hdr *);
603 } else {
604 m->m_next->m_len += sizeof(struct ip6_hdr);
605 m->m_next->m_data -= sizeof(struct ip6_hdr);
606 m->m_pkthdr.len += sizeof(struct ip6_hdr);
607 oip6 = mtod(m->m_next, struct ip6_hdr *);
608 }
609 ip6 = mtod(m, struct ip6_hdr *);
610 ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
611
612 /* Fake link-local scope-class addresses */
613 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
614 oip6->ip6_src.s6_addr16[1] = 0;
615 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
616 oip6->ip6_dst.s6_addr16[1] = 0;
617
618 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
619 /* ECN consideration. */
620 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
621 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
622 ip6->ip6_plen = htons(plen);
623 else {
624 /* ip6->ip6_plen will be updated in ip6_output() */
625 }
626 ip6->ip6_nxt = IPPROTO_IPV6;
627 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src;
628 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst;
629 ip6->ip6_hlim = IPV6_DEFHLIM;
630
631 /* XXX Should ip6_src be updated later ? */
632
633 return 0;
634 }
635
636 /*
637 * IPsec output logic for IPv6, tunnel mode.
638 */
639 int
640 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
641 {
642 struct ip6_hdr *ip6;
643 struct ipsecrequest *isr;
644 struct secasindex saidx;
645 int error;
646 struct sockaddr_in6* dst6;
647 struct mbuf *m;
648
649 IPSEC_ASSERT(state != NULL, ("ipsec6_output: null state"));
650 IPSEC_ASSERT(state->m != NULL, ("ipsec6_output: null m"));
651 IPSEC_ASSERT(sp != NULL, ("ipsec6_output: null sp"));
652
653 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
654 printf("ipsec6_output_tunnel: applyed SP\n");
655 kdebug_secpolicy(sp));
656
657 m = state->m;
658 /*
659 * transport mode ipsec (before the 1st tunnel mode) is already
660 * processed by ipsec6_output_trans().
661 */
662 for (isr = sp->req; isr; isr = isr->next) {
663 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
664 break;
665 }
666 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
667 if (isr == NULL)
668 goto bad;
669
670 /*
671 * There may be the case that SA status will be changed when
672 * we are refering to one. So calling splsoftnet().
673 */
674 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
675 /*
676 * build IPsec tunnel.
677 */
678 /* XXX should be processed with other familiy */
679 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
680 ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
681 "family mismatched between inner and outer, spi=%lu\n",
682 ntohl(isr->sav->spi)));
683 newipsecstat.ips_out_inval++;
684 error = EAFNOSUPPORT;
685 goto bad;
686 }
687
688 m = ipsec6_splithdr(m);
689 if (!m) {
690 newipsecstat.ips_out_nomem++;
691 error = ENOMEM;
692 goto bad;
693 }
694 error = ipsec6_encapsulate(m, isr->sav);
695 if (error) {
696 m = NULL;
697 goto bad;
698 }
699 ip6 = mtod(m, struct ip6_hdr *);
700
701 state->ro = &isr->sav->sah->sa_route;
702 state->dst = (struct sockaddr *)&state->ro->ro_dst;
703 dst6 = (struct sockaddr_in6 *)state->dst;
704 if (state->ro->ro_rt
705 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
706 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
707 RTFREE(state->ro->ro_rt);
708 state->ro->ro_rt = NULL;
709 }
710 if (state->ro->ro_rt == 0) {
711 bzero(dst6, sizeof(*dst6));
712 dst6->sin6_family = AF_INET6;
713 dst6->sin6_len = sizeof(*dst6);
714 dst6->sin6_addr = ip6->ip6_dst;
715 rtalloc(state->ro);
716 }
717 if (state->ro->ro_rt == 0) {
718 ip6stat.ip6s_noroute++;
719 newipsecstat.ips_out_noroute++;
720 error = EHOSTUNREACH;
721 goto bad;
722 }
723
724 /* adjust state->dst if tunnel endpoint is offlink */
725 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
726 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
727 dst6 = (struct sockaddr_in6 *)state->dst;
728 }
729 }
730
731 m = ipsec6_splithdr(m);
732 if (!m) {
733 newipsecstat.ips_out_nomem++;
734 error = ENOMEM;
735 goto bad;
736 }
737 ip6 = mtod(m, struct ip6_hdr *);
738 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
739 sizeof (struct ip6_hdr),
740 offsetof(struct ip6_hdr, ip6_nxt));
741 bad:
742 if (m)
743 m_freem(m);
744 state->m = NULL;
745 return error;
746 }
747 #endif /*INET6*/
748