1 /*-
2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 /*
30 * IPsec output processing.
31 */
32 #include "opt_inet.h"
33 #include "opt_inet6.h"
34 #include "opt_ipsec.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/mbuf.h>
39 #include <sys/domain.h>
40 #include <sys/protosw.h>
41 #include <sys/socket.h>
42 #include <sys/errno.h>
43 #include <sys/syslog.h>
44
45 #include <net/if.h>
46 #include <net/route.h>
47
48 #include <netinet/in.h>
49 #include <netinet/in_systm.h>
50 #include <netinet/ip.h>
51 #include <netinet/ip_var.h>
52 #include <netinet/in_var.h>
53 #include <netinet/ip_ecn.h>
54 #ifdef INET6
55 #include <netinet6/ip6_ecn.h>
56 #endif
57
58 #include <netinet/ip6.h>
59 #ifdef INET6
60 #include <netinet6/ip6_var.h>
61 #endif
62 #include <netinet/in_pcb.h>
63 #ifdef INET6
64 #include <netinet/icmp6.h>
65 #endif
66
67 #include <netipsec/ipsec.h>
68 #ifdef INET6
69 #include <netipsec/ipsec6.h>
70 #endif
71 #include <netipsec/ah_var.h>
72 #include <netipsec/esp_var.h>
73 #include <netipsec/ipcomp_var.h>
74
75 #include <netipsec/xform.h>
76
77 #include <netipsec/key.h>
78 #include <netipsec/keydb.h>
79 #include <netipsec/key_debug.h>
80
81 #include <machine/in_cksum.h>
82
83 int
84 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
85 {
86 struct tdb_ident *tdbi;
87 struct m_tag *mtag;
88 struct secasvar *sav;
89 struct secasindex *saidx;
90 int error;
91
92 SPLASSERT(net, "ipsec_process_done");
93
94 KASSERT(m != NULL, ("ipsec_process_done: null mbuf"));
95 KASSERT(isr != NULL, ("ipsec_process_done: null ISR"));
96 sav = isr->sav;
97 KASSERT(sav != NULL, ("ipsec_process_done: null SA"));
98 KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH"));
99
100 saidx = &sav->sah->saidx;
101 switch (saidx->dst.sa.sa_family) {
102 #ifdef INET
103 case AF_INET:
104 /* Fix the header length, for AH processing. */
105 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
106 break;
107 #endif /* INET */
108 #ifdef INET6
109 case AF_INET6:
110 /* Fix the header length, for AH processing. */
111 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
112 error = ENXIO;
113 goto bad;
114 }
115 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
116 /* No jumbogram support. */
117 error = ENXIO; /*?*/
118 goto bad;
119 }
120 mtod(m, struct ip6_hdr *)->ip6_plen =
121 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
122 break;
123 #endif /* INET6 */
124 default:
125 DPRINTF(("ipsec_process_done: unknown protocol family %u\n",
126 saidx->dst.sa.sa_family));
127 error = ENXIO;
128 goto bad;
129 }
130
131 /*
132 * Add a record of what we've done or what needs to be done to the
133 * packet.
134 */
135 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
136 sizeof(struct tdb_ident), M_NOWAIT);
137 if (mtag == NULL) {
138 DPRINTF(("ipsec_process_done: could not get packet tag\n"));
139 error = ENOMEM;
140 goto bad;
141 }
142
143 tdbi = (struct tdb_ident *)(mtag + 1);
144 tdbi->dst = saidx->dst;
145 tdbi->proto = saidx->proto;
146 tdbi->spi = sav->spi;
147 m_tag_prepend(m, mtag);
148
149 /*
150 * If there's another (bundled) SA to apply, do so.
151 * Note that this puts a burden on the kernel stack size.
152 * If this is a problem we'll need to introduce a queue
153 * to set the packet on so we can unwind the stack before
154 * doing further processing.
155 */
156 if (isr->next) {
157 newipsecstat.ips_out_bundlesa++;
158 return ipsec4_process_packet(m, isr->next, 0, 0);
159 }
160 key_sa_recordxfer(sav, m); /* record data transfer */
161
162 /*
163 * We're done with IPsec processing, transmit the packet using the
164 * appropriate network protocol (IP or IPv6). SPD lookup will be
165 * performed again there.
166 */
167 switch (saidx->dst.sa.sa_family) {
168 #ifdef INET
169 struct ip *ip;
170 case AF_INET:
171 ip = mtod(m, struct ip *);
172 ip->ip_len = ntohs(ip->ip_len);
173 ip->ip_off = ntohs(ip->ip_off);
174
175 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
176 #endif /* INET */
177 #ifdef INET6
178 case AF_INET6:
179 /*
180 * We don't need massage, IPv6 header fields are always in
181 * net endian.
182 */
183 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
184 #endif /* INET6 */
185 }
186 panic("ipsec_process_done");
187 bad:
188 m_freem(m);
189 KEY_FREESAV(&sav);
190 return (error);
191 }
192
193 static struct ipsecrequest *
194 ipsec_nextisr(
195 struct mbuf *m,
196 struct ipsecrequest *isr,
197 int af,
198 struct secasindex *saidx,
199 int *error
200 )
201 {
202 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
203 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
204 struct secasvar *sav;
205
206 SPLASSERT(net, "ipsec_nextisr");
207 KASSERT(af == AF_INET || af == AF_INET6,
208 ("ipsec_nextisr: invalid address family %u", af));
209 again:
210 /*
211 * Craft SA index to search for proper SA. Note that
212 * we only fillin unspecified SA peers for transport
213 * mode; for tunnel mode they must already be filled in.
214 */
215 *saidx = isr->saidx;
216 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
217 /* Fillin unspecified SA peers only for transport mode */
218 if (af == AF_INET) {
219 struct sockaddr_in *sin;
220 struct ip *ip = mtod(m, struct ip *);
221
222 if (saidx->src.sa.sa_len == 0) {
223 sin = &saidx->src.sin;
224 sin->sin_len = sizeof(*sin);
225 sin->sin_family = AF_INET;
226 sin->sin_port = IPSEC_PORT_ANY;
227 sin->sin_addr = ip->ip_src;
228 }
229 if (saidx->dst.sa.sa_len == 0) {
230 sin = &saidx->dst.sin;
231 sin->sin_len = sizeof(*sin);
232 sin->sin_family = AF_INET;
233 sin->sin_port = IPSEC_PORT_ANY;
234 sin->sin_addr = ip->ip_dst;
235 }
236 } else {
237 struct sockaddr_in6 *sin6;
238 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
239
240 if (saidx->src.sin6.sin6_len == 0) {
241 sin6 = (struct sockaddr_in6 *)&saidx->src;
242 sin6->sin6_len = sizeof(*sin6);
243 sin6->sin6_family = AF_INET6;
244 sin6->sin6_port = IPSEC_PORT_ANY;
245 sin6->sin6_addr = ip6->ip6_src;
246 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
247 /* fix scope id for comparing SPD */
248 sin6->sin6_addr.s6_addr16[1] = 0;
249 sin6->sin6_scope_id =
250 ntohs(ip6->ip6_src.s6_addr16[1]);
251 }
252 }
253 if (saidx->dst.sin6.sin6_len == 0) {
254 sin6 = (struct sockaddr_in6 *)&saidx->dst;
255 sin6->sin6_len = sizeof(*sin6);
256 sin6->sin6_family = AF_INET6;
257 sin6->sin6_port = IPSEC_PORT_ANY;
258 sin6->sin6_addr = ip6->ip6_dst;
259 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
260 /* fix scope id for comparing SPD */
261 sin6->sin6_addr.s6_addr16[1] = 0;
262 sin6->sin6_scope_id =
263 ntohs(ip6->ip6_dst.s6_addr16[1]);
264 }
265 }
266 }
267 }
268
269 /*
270 * Lookup SA and validate it.
271 */
272 *error = key_checkrequest(isr, saidx);
273 if (*error != 0) {
274 /*
275 * IPsec processing is required, but no SA found.
276 * I assume that key_acquire() had been called
277 * to get/establish the SA. Here I discard
278 * this packet because it is responsibility for
279 * upper layer to retransmit the packet.
280 */
281 newipsecstat.ips_out_nosa++;
282 goto bad;
283 }
284 sav = isr->sav;
285 if (sav == NULL) { /* XXX valid return */
286 KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
287 ("ipsec_nextisr: no SA found, but required; level %u",
288 ipsec_get_reqlevel(isr)));
289 isr = isr->next;
290 if (isr == NULL) {
291 /*XXXstatistic??*/
292 *error = EINVAL; /*XXX*/
293 return isr;
294 }
295 goto again;
296 }
297
298 /*
299 * Check system global policy controls.
300 */
301 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
302 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
303 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
304 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due"
305 " to policy (check your sysctls)\n"));
306 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
307 ipcompstat.ipcomps_pdrops);
308 *error = EHOSTUNREACH;
309 goto bad;
310 }
311
312 /*
313 * Sanity check the SA contents for the caller
314 * before they invoke the xform output method.
315 */
316 if (sav->tdb_xform == NULL) {
317 DPRINTF(("ipsec_nextisr: no transform for SA\n"));
318 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
319 ipcompstat.ipcomps_noxform);
320 *error = EHOSTUNREACH;
321 goto bad;
322 }
323 return isr;
324 bad:
325 KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code"));
326 return NULL;
327 #undef IPSEC_OSTAT
328 }
329
330 #ifdef INET
331 /*
332 * IPsec output logic for IPv4.
333 */
334 int
335 ipsec4_process_packet(
336 struct mbuf *m,
337 struct ipsecrequest *isr,
338 int flags,
339 int tunalready)
340 {
341 struct secasindex saidx;
342 struct secasvar *sav;
343 struct ip *ip;
344 int s, error, i, off;
345
346 KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf"));
347 KASSERT(isr != NULL, ("ipsec4_process_packet: null isr"));
348
349 s = splnet(); /* insure SA contents don't change */
350
351 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
352 if (isr == NULL)
353 goto bad;
354
355 sav = isr->sav;
356 if (!tunalready) {
357 union sockaddr_union *dst = &sav->sah->saidx.dst;
358 int setdf;
359
360 /*
361 * Collect IP_DF state from the outer header.
362 */
363 if (dst->sa.sa_family == AF_INET) {
364 if (m->m_len < sizeof (struct ip) &&
365 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
366 error = ENOBUFS;
367 goto bad;
368 }
369 ip = mtod(m, struct ip *);
370 /* Honor system-wide control of how to handle IP_DF */
371 switch (ip4_ipsec_dfbit) {
372 case 0: /* clear in outer header */
373 case 1: /* set in outer header */
374 setdf = ip4_ipsec_dfbit;
375 break;
376 default: /* propagate to outer header */
377 setdf = ntohs(ip->ip_off & IP_DF);
378 break;
379 }
380 } else {
381 ip = NULL; /* keep compiler happy */
382 setdf = 0;
383 }
384 /* Do the appropriate encapsulation, if necessary */
385 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
386 dst->sa.sa_family != AF_INET || /* PF mismatch */
387 #if 0
388 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
389 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
390 #endif
391 (dst->sa.sa_family == AF_INET && /* Proxy */
392 dst->sin.sin_addr.s_addr != INADDR_ANY &&
393 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
394 struct mbuf *mp;
395
396 /* Fix IPv4 header checksum and length */
397 if (m->m_len < sizeof (struct ip) &&
398 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
399 error = ENOBUFS;
400 goto bad;
401 }
402 ip = mtod(m, struct ip *);
403 ip->ip_len = htons(m->m_pkthdr.len);
404 ip->ip_sum = 0;
405 #ifdef _IP_VHL
406 if (ip->ip_vhl == IP_VHL_BORING)
407 ip->ip_sum = in_cksum_hdr(ip);
408 else
409 ip->ip_sum = in_cksum(m,
410 _IP_VHL_HL(ip->ip_vhl) << 2);
411 #else
412 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
413 #endif
414
415 /* Encapsulate the packet */
416 error = ipip_output(m, isr, &mp, 0, 0);
417 if (mp == NULL && !error) {
418 /* Should never happen. */
419 DPRINTF(("ipsec4_process_packet: ipip_output "
420 "returns no mbuf and no error!"));
421 error = EFAULT;
422 }
423 if (error) {
424 if (mp)
425 m_freem(mp);
426 goto bad;
427 }
428 m = mp, mp = NULL;
429 /*
430 * ipip_output clears IP_DF in the new header. If
431 * we need to propagate IP_DF from the outer header,
432 * then we have to do it here.
433 *
434 * XXX shouldn't assume what ipip_output does.
435 */
436 if (dst->sa.sa_family == AF_INET && setdf) {
437 if (m->m_len < sizeof (struct ip) &&
438 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
439 error = ENOBUFS;
440 goto bad;
441 }
442 ip = mtod(m, struct ip *);
443 ip->ip_off = ntohs(ip->ip_off);
444 ip->ip_off |= IP_DF;
445 ip->ip_off = htons(ip->ip_off);
446 }
447 }
448 }
449
450 /*
451 * Dispatch to the appropriate IPsec transform logic. The
452 * packet will be returned for transmission after crypto
453 * processing, etc. are completed. For encapsulation we
454 * bypass this call because of the explicit call done above
455 * (necessary to deal with IP_DF handling for IPv4).
456 *
457 * NB: m & sav are ``passed to caller'' who's reponsible for
458 * for reclaiming their resources.
459 */
460 if (sav->tdb_xform->xf_type != XF_IP4) {
461 ip = mtod(m, struct ip *);
462 i = ip->ip_hl << 2;
463 off = offsetof(struct ip, ip_p);
464 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
465 } else {
466 error = ipsec_process_done(m, isr);
467 }
468 splx(s);
469 return error;
470 bad:
471 splx(s);
472 if (m)
473 m_freem(m);
474 return error;
475 }
476 #endif
477
478 #ifdef INET6
479 /*
480 * Chop IP6 header from the payload.
481 */
482 static struct mbuf *
483 ipsec6_splithdr(struct mbuf *m)
484 {
485 struct mbuf *mh;
486 struct ip6_hdr *ip6;
487 int hlen;
488
489 KASSERT(m->m_len >= sizeof (struct ip6_hdr),
490 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len));
491 ip6 = mtod(m, struct ip6_hdr *);
492 hlen = sizeof(struct ip6_hdr);
493 if (m->m_len > hlen) {
494 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
495 if (!mh) {
496 m_freem(m);
497 return NULL;
498 }
499 M_MOVE_PKTHDR(mh, m);
500 MH_ALIGN(mh, hlen);
501 m->m_len -= hlen;
502 m->m_data += hlen;
503 mh->m_next = m;
504 m = mh;
505 m->m_len = hlen;
506 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
507 } else if (m->m_len < hlen) {
508 m = m_pullup(m, hlen);
509 if (!m)
510 return NULL;
511 }
512 return m;
513 }
514
515 /*
516 * IPsec output logic for IPv6, transport mode.
517 */
518 int
519 ipsec6_output_trans(
520 struct ipsec_output_state *state,
521 u_char *nexthdrp,
522 struct mbuf *mprev,
523 struct secpolicy *sp,
524 int flags,
525 int *tun)
526 {
527 struct ipsecrequest *isr;
528 struct secasindex saidx;
529 int error = 0;
530 struct mbuf *m;
531
532 KASSERT(state != NULL, ("ipsec6_output: null state"));
533 KASSERT(state->m != NULL, ("ipsec6_output: null m"));
534 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp"));
535 KASSERT(mprev != NULL, ("ipsec6_output: null mprev"));
536 KASSERT(sp != NULL, ("ipsec6_output: null sp"));
537 KASSERT(tun != NULL, ("ipsec6_output: null tun"));
538
539 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
540 printf("ipsec6_output_trans: applyed SP\n");
541 kdebug_secpolicy(sp));
542
543 isr = sp->req;
544 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
545 /* the rest will be handled by ipsec6_output_tunnel() */
546 *tun = 1; /* need tunnel-mode processing */
547 return 0;
548 }
549
550 *tun = 0;
551 m = state->m;
552
553 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
554 if (isr == NULL) {
555 #ifdef notdef
556 /* XXX should notification be done for all errors ? */
557 /*
558 * Notify the fact that the packet is discarded
559 * to ourselves. I believe this is better than
560 * just silently discarding. (jinmei@kame.net)
561 * XXX: should we restrict the error to TCP packets?
562 * XXX: should we directly notify sockets via
563 * pfctlinputs?
564 */
565 icmp6_error(m, ICMP6_DST_UNREACH,
566 ICMP6_DST_UNREACH_ADMIN, 0);
567 m = NULL; /* NB: icmp6_error frees mbuf */
568 #endif
569 goto bad;
570 }
571
572 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
573 sizeof (struct ip6_hdr),
574 offsetof(struct ip6_hdr, ip6_nxt));
575 bad:
576 if (m)
577 m_freem(m);
578 state->m = NULL;
579 return error;
580 }
581
582 static int
583 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
584 {
585 struct ip6_hdr *oip6;
586 struct ip6_hdr *ip6;
587 size_t plen;
588
589 /* can't tunnel between different AFs */
590 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
591 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
592 m_freem(m);
593 return EINVAL;
594 }
595 KASSERT(m->m_len != sizeof (struct ip6_hdr),
596 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len));
597
598
599 /*
600 * grow the mbuf to accomodate the new IPv6 header.
601 */
602 plen = m->m_pkthdr.len;
603 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
604 struct mbuf *n;
605 MGET(n, M_DONTWAIT, MT_DATA);
606 if (!n) {
607 m_freem(m);
608 return ENOBUFS;
609 }
610 n->m_len = sizeof(struct ip6_hdr);
611 n->m_next = m->m_next;
612 m->m_next = n;
613 m->m_pkthdr.len += sizeof(struct ip6_hdr);
614 oip6 = mtod(n, struct ip6_hdr *);
615 } else {
616 m->m_next->m_len += sizeof(struct ip6_hdr);
617 m->m_next->m_data -= sizeof(struct ip6_hdr);
618 m->m_pkthdr.len += sizeof(struct ip6_hdr);
619 oip6 = mtod(m->m_next, struct ip6_hdr *);
620 }
621 ip6 = mtod(m, struct ip6_hdr *);
622 ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
623
624 /* Fake link-local scope-class addresses */
625 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
626 oip6->ip6_src.s6_addr16[1] = 0;
627 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
628 oip6->ip6_dst.s6_addr16[1] = 0;
629
630 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
631 /* ECN consideration. */
632 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
633 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
634 ip6->ip6_plen = htons(plen);
635 else {
636 /* ip6->ip6_plen will be updated in ip6_output() */
637 }
638 ip6->ip6_nxt = IPPROTO_IPV6;
639 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src;
640 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst;
641 ip6->ip6_hlim = IPV6_DEFHLIM;
642
643 /* XXX Should ip6_src be updated later ? */
644
645 return 0;
646 }
647
648 /*
649 * IPsec output logic for IPv6, tunnel mode.
650 */
651 int
652 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
653 {
654 struct ip6_hdr *ip6;
655 struct ipsecrequest *isr;
656 struct secasindex saidx;
657 int error;
658 struct sockaddr_in6* dst6;
659 struct mbuf *m;
660
661 KASSERT(state != NULL, ("ipsec6_output: null state"));
662 KASSERT(state->m != NULL, ("ipsec6_output: null m"));
663 KASSERT(sp != NULL, ("ipsec6_output: null sp"));
664
665 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
666 printf("ipsec6_output_tunnel: applyed SP\n");
667 kdebug_secpolicy(sp));
668
669 m = state->m;
670 /*
671 * transport mode ipsec (before the 1st tunnel mode) is already
672 * processed by ipsec6_output_trans().
673 */
674 for (isr = sp->req; isr; isr = isr->next) {
675 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
676 break;
677 }
678 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
679 if (isr == NULL)
680 goto bad;
681
682 /*
683 * There may be the case that SA status will be changed when
684 * we are refering to one. So calling splsoftnet().
685 */
686 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
687 /*
688 * build IPsec tunnel.
689 */
690 /* XXX should be processed with other familiy */
691 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
692 ipseclog((LOG_ERR, "ipsec6_output_tunnel: "
693 "family mismatched between inner and outer, spi=%lu\n",
694 ntohl(isr->sav->spi)));
695 newipsecstat.ips_out_inval++;
696 error = EAFNOSUPPORT;
697 goto bad;
698 }
699
700 m = ipsec6_splithdr(m);
701 if (!m) {
702 newipsecstat.ips_out_nomem++;
703 error = ENOMEM;
704 goto bad;
705 }
706 error = ipsec6_encapsulate(m, isr->sav);
707 if (error) {
708 m = NULL;
709 goto bad;
710 }
711 ip6 = mtod(m, struct ip6_hdr *);
712
713 state->ro = &isr->sav->sah->sa_route;
714 state->dst = (struct sockaddr *)&state->ro->ro_dst;
715 dst6 = (struct sockaddr_in6 *)state->dst;
716 if (state->ro->ro_rt
717 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
718 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
719 RTFREE(state->ro->ro_rt);
720 state->ro->ro_rt = NULL;
721 }
722 if (state->ro->ro_rt == 0) {
723 bzero(dst6, sizeof(*dst6));
724 dst6->sin6_family = AF_INET6;
725 dst6->sin6_len = sizeof(*dst6);
726 dst6->sin6_addr = ip6->ip6_dst;
727 rtalloc(state->ro);
728 }
729 if (state->ro->ro_rt == 0) {
730 ip6stat.ip6s_noroute++;
731 newipsecstat.ips_out_noroute++;
732 error = EHOSTUNREACH;
733 goto bad;
734 }
735
736 /* adjust state->dst if tunnel endpoint is offlink */
737 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
738 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
739 dst6 = (struct sockaddr_in6 *)state->dst;
740 }
741 }
742
743 m = ipsec6_splithdr(m);
744 if (!m) {
745 newipsecstat.ips_out_nomem++;
746 error = ENOMEM;
747 goto bad;
748 }
749 ip6 = mtod(m, struct ip6_hdr *);
750 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
751 sizeof (struct ip6_hdr),
752 offsetof(struct ip6_hdr, ip6_nxt));
753 bad:
754 if (m)
755 m_freem(m);
756 state->m = NULL;
757 return error;
758 }
759 #endif /*INET6*/
Cache object: 87d7811384af7f90451c594f19ef3296
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