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: releng/6.4/sys/netipsec/ipsec_output.c 176951 2008-03-08 18:56:22Z bz $
27 */
28
29 /*
30 * IPsec output processing.
31 */
32 #include "opt_inet.h"
33 #include "opt_inet6.h"
34 #include "opt_ipsec.h"
35 #include "opt_enc.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mbuf.h>
40 #include <sys/domain.h>
41 #include <sys/protosw.h>
42 #include <sys/socket.h>
43 #include <sys/errno.h>
44 #include <sys/syslog.h>
45
46 #include <net/if.h>
47 #include <net/pfil.h>
48 #include <net/route.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_systm.h>
52 #include <netinet/ip.h>
53 #include <netinet/ip_var.h>
54 #include <netinet/in_var.h>
55 #include <netinet/ip_ecn.h>
56 #ifdef INET6
57 #include <netinet6/ip6_ecn.h>
58 #endif
59
60 #include <netinet/ip6.h>
61 #ifdef INET6
62 #include <netinet6/ip6_var.h>
63 #endif
64 #include <netinet/in_pcb.h>
65 #ifdef INET6
66 #include <netinet/icmp6.h>
67 #endif
68
69 #include <netipsec/ipsec.h>
70 #ifdef INET6
71 #include <netipsec/ipsec6.h>
72 #endif
73 #include <netipsec/ah_var.h>
74 #include <netipsec/esp_var.h>
75 #include <netipsec/ipcomp_var.h>
76
77 #include <netipsec/xform.h>
78
79 #include <netipsec/key.h>
80 #include <netipsec/keydb.h>
81 #include <netipsec/key_debug.h>
82
83 #include <machine/in_cksum.h>
84
85 int
86 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
87 {
88 struct tdb_ident *tdbi;
89 struct m_tag *mtag;
90 struct secasvar *sav;
91 struct secasindex *saidx;
92 int error;
93
94 IPSEC_SPLASSERT_SOFTNET(__func__);
95
96 IPSEC_ASSERT(m != NULL, ("null mbuf"));
97 IPSEC_ASSERT(isr != NULL, ("null ISR"));
98 sav = isr->sav;
99 IPSEC_ASSERT(sav != NULL, ("null SA"));
100 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
101
102 saidx = &sav->sah->saidx;
103 switch (saidx->dst.sa.sa_family) {
104 #ifdef INET
105 case AF_INET:
106 /* Fix the header length, for AH processing. */
107 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
108 break;
109 #endif /* INET */
110 #ifdef INET6
111 case AF_INET6:
112 /* Fix the header length, for AH processing. */
113 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
114 error = ENXIO;
115 goto bad;
116 }
117 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
118 /* No jumbogram support. */
119 error = ENXIO; /*?*/
120 goto bad;
121 }
122 mtod(m, struct ip6_hdr *)->ip6_plen =
123 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
124 break;
125 #endif /* INET6 */
126 default:
127 DPRINTF(("%s: unknown protocol family %u\n", __func__,
128 saidx->dst.sa.sa_family));
129 error = ENXIO;
130 goto bad;
131 }
132
133 /*
134 * Add a record of what we've done or what needs to be done to the
135 * packet.
136 */
137 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
138 sizeof(struct tdb_ident), M_NOWAIT);
139 if (mtag == NULL) {
140 DPRINTF(("%s: could not get packet tag\n", __func__));
141 error = ENOMEM;
142 goto bad;
143 }
144
145 tdbi = (struct tdb_ident *)(mtag + 1);
146 tdbi->dst = saidx->dst;
147 tdbi->proto = saidx->proto;
148 tdbi->spi = sav->spi;
149 m_tag_prepend(m, mtag);
150
151 /*
152 * If there's another (bundled) SA to apply, do so.
153 * Note that this puts a burden on the kernel stack size.
154 * If this is a problem we'll need to introduce a queue
155 * to set the packet on so we can unwind the stack before
156 * doing further processing.
157 */
158 if (isr->next) {
159 newipsecstat.ips_out_bundlesa++;
160 return ipsec4_process_packet(m, isr->next, 0, 0);
161 }
162 key_sa_recordxfer(sav, m); /* record data transfer */
163
164 /*
165 * We're done with IPsec processing, transmit the packet using the
166 * appropriate network protocol (IP or IPv6). SPD lookup will be
167 * performed again there.
168 */
169 switch (saidx->dst.sa.sa_family) {
170 #ifdef INET
171 struct ip *ip;
172 case AF_INET:
173 ip = mtod(m, struct ip *);
174 ip->ip_len = ntohs(ip->ip_len);
175 ip->ip_off = ntohs(ip->ip_off);
176
177 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
178 #endif /* INET */
179 #ifdef INET6
180 case AF_INET6:
181 /*
182 * We don't need massage, IPv6 header fields are always in
183 * net endian.
184 */
185 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
186 #endif /* INET6 */
187 }
188 panic("ipsec_process_done");
189 bad:
190 m_freem(m);
191 KEY_FREESAV(&sav);
192 return (error);
193 }
194
195 static struct ipsecrequest *
196 ipsec_nextisr(
197 struct mbuf *m,
198 struct ipsecrequest *isr,
199 int af,
200 struct secasindex *saidx,
201 int *error
202 )
203 {
204 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
205 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
206 struct secasvar *sav;
207
208 IPSEC_SPLASSERT_SOFTNET(__func__);
209 IPSECREQUEST_LOCK_ASSERT(isr);
210
211 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
212 ("invalid address family %u", af));
213 again:
214 /*
215 * Craft SA index to search for proper SA. Note that
216 * we only fillin unspecified SA peers for transport
217 * mode; for tunnel mode they must already be filled in.
218 */
219 *saidx = isr->saidx;
220 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
221 /* Fillin unspecified SA peers only for transport mode */
222 if (af == AF_INET) {
223 struct sockaddr_in *sin;
224 struct ip *ip = mtod(m, struct ip *);
225
226 if (saidx->src.sa.sa_len == 0) {
227 sin = &saidx->src.sin;
228 sin->sin_len = sizeof(*sin);
229 sin->sin_family = AF_INET;
230 sin->sin_port = IPSEC_PORT_ANY;
231 sin->sin_addr = ip->ip_src;
232 }
233 if (saidx->dst.sa.sa_len == 0) {
234 sin = &saidx->dst.sin;
235 sin->sin_len = sizeof(*sin);
236 sin->sin_family = AF_INET;
237 sin->sin_port = IPSEC_PORT_ANY;
238 sin->sin_addr = ip->ip_dst;
239 }
240 } else {
241 struct sockaddr_in6 *sin6;
242 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
243
244 if (saidx->src.sin6.sin6_len == 0) {
245 sin6 = (struct sockaddr_in6 *)&saidx->src;
246 sin6->sin6_len = sizeof(*sin6);
247 sin6->sin6_family = AF_INET6;
248 sin6->sin6_port = IPSEC_PORT_ANY;
249 sin6->sin6_addr = ip6->ip6_src;
250 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
251 /* fix scope id for comparing SPD */
252 sin6->sin6_addr.s6_addr16[1] = 0;
253 sin6->sin6_scope_id =
254 ntohs(ip6->ip6_src.s6_addr16[1]);
255 }
256 }
257 if (saidx->dst.sin6.sin6_len == 0) {
258 sin6 = (struct sockaddr_in6 *)&saidx->dst;
259 sin6->sin6_len = sizeof(*sin6);
260 sin6->sin6_family = AF_INET6;
261 sin6->sin6_port = IPSEC_PORT_ANY;
262 sin6->sin6_addr = ip6->ip6_dst;
263 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
264 /* fix scope id for comparing SPD */
265 sin6->sin6_addr.s6_addr16[1] = 0;
266 sin6->sin6_scope_id =
267 ntohs(ip6->ip6_dst.s6_addr16[1]);
268 }
269 }
270 }
271 }
272
273 /*
274 * Lookup SA and validate it.
275 */
276 *error = key_checkrequest(isr, saidx);
277 if (*error != 0) {
278 /*
279 * IPsec processing is required, but no SA found.
280 * I assume that key_acquire() had been called
281 * to get/establish the SA. Here I discard
282 * this packet because it is responsibility for
283 * upper layer to retransmit the packet.
284 */
285 newipsecstat.ips_out_nosa++;
286 goto bad;
287 }
288 sav = isr->sav;
289 if (sav == NULL) { /* XXX valid return */
290 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
291 ("no SA found, but required; level %u",
292 ipsec_get_reqlevel(isr)));
293 IPSECREQUEST_UNLOCK(isr);
294 isr = isr->next;
295 if (isr == NULL) {
296 /*XXXstatistic??*/
297 *error = EINVAL; /*XXX*/
298 return isr;
299 }
300 IPSECREQUEST_LOCK(isr);
301 goto again;
302 }
303
304 /*
305 * Check system global policy controls.
306 */
307 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
308 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
309 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
310 DPRINTF(("%s: IPsec outbound packet dropped due"
311 " to policy (check your sysctls)\n", __func__));
312 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
313 ipcompstat.ipcomps_pdrops);
314 *error = EHOSTUNREACH;
315 goto bad;
316 }
317
318 /*
319 * Sanity check the SA contents for the caller
320 * before they invoke the xform output method.
321 */
322 if (sav->tdb_xform == NULL) {
323 DPRINTF(("%s: no transform for SA\n", __func__));
324 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
325 ipcompstat.ipcomps_noxform);
326 *error = EHOSTUNREACH;
327 goto bad;
328 }
329 return isr;
330 bad:
331 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
332 IPSECREQUEST_UNLOCK(isr);
333 return NULL;
334 #undef IPSEC_OSTAT
335 }
336
337 #ifdef INET
338 /*
339 * IPsec output logic for IPv4.
340 */
341 int
342 ipsec4_process_packet(
343 struct mbuf *m,
344 struct ipsecrequest *isr,
345 int flags,
346 int tunalready)
347 {
348 struct secasindex saidx;
349 struct secasvar *sav;
350 struct ip *ip;
351 int error, i, off;
352
353 IPSEC_ASSERT(m != NULL, ("null mbuf"));
354 IPSEC_ASSERT(isr != NULL, ("null isr"));
355
356 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
357
358 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
359 if (isr == NULL)
360 goto bad;
361
362 sav = isr->sav;
363
364 #ifdef DEV_ENC
365 /* pass the mbuf to enc0 for packet filtering */
366 if ((error = ipsec_filter(&m, PFIL_OUT)) != 0)
367 goto bad;
368 #endif
369
370 if (!tunalready) {
371 union sockaddr_union *dst = &sav->sah->saidx.dst;
372 int setdf;
373
374 /*
375 * Collect IP_DF state from the outer header.
376 */
377 if (dst->sa.sa_family == AF_INET) {
378 if (m->m_len < sizeof (struct ip) &&
379 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
380 error = ENOBUFS;
381 goto bad;
382 }
383 ip = mtod(m, struct ip *);
384 /* Honor system-wide control of how to handle IP_DF */
385 switch (ip4_ipsec_dfbit) {
386 case 0: /* clear in outer header */
387 case 1: /* set in outer header */
388 setdf = ip4_ipsec_dfbit;
389 break;
390 default: /* propagate to outer header */
391 setdf = ntohs(ip->ip_off & IP_DF);
392 break;
393 }
394 } else {
395 ip = NULL; /* keep compiler happy */
396 setdf = 0;
397 }
398 /* Do the appropriate encapsulation, if necessary */
399 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
400 dst->sa.sa_family != AF_INET || /* PF mismatch */
401 #if 0
402 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
403 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
404 #endif
405 (dst->sa.sa_family == AF_INET && /* Proxy */
406 dst->sin.sin_addr.s_addr != INADDR_ANY &&
407 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
408 struct mbuf *mp;
409
410 /* Fix IPv4 header checksum and length */
411 if (m->m_len < sizeof (struct ip) &&
412 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
413 error = ENOBUFS;
414 goto bad;
415 }
416 ip = mtod(m, struct ip *);
417 ip->ip_len = htons(m->m_pkthdr.len);
418 ip->ip_sum = 0;
419 #ifdef _IP_VHL
420 if (ip->ip_vhl == IP_VHL_BORING)
421 ip->ip_sum = in_cksum_hdr(ip);
422 else
423 ip->ip_sum = in_cksum(m,
424 _IP_VHL_HL(ip->ip_vhl) << 2);
425 #else
426 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
427 #endif
428
429 /* Encapsulate the packet */
430 error = ipip_output(m, isr, &mp, 0, 0);
431 if (mp == NULL && !error) {
432 /* Should never happen. */
433 DPRINTF(("%s: ipip_output returns no mbuf and "
434 "no error!", __func__));
435 error = EFAULT;
436 }
437 if (error) {
438 if (mp) {
439 /* XXX: Should never happen! */
440 m_freem(mp);
441 }
442 m = NULL; /* ipip_output() already freed it */
443 goto bad;
444 }
445 m = mp, mp = NULL;
446 /*
447 * ipip_output clears IP_DF in the new header. If
448 * we need to propagate IP_DF from the outer header,
449 * then we have to do it here.
450 *
451 * XXX shouldn't assume what ipip_output does.
452 */
453 if (dst->sa.sa_family == AF_INET && setdf) {
454 if (m->m_len < sizeof (struct ip) &&
455 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
456 error = ENOBUFS;
457 goto bad;
458 }
459 ip = mtod(m, struct ip *);
460 ip->ip_off = ntohs(ip->ip_off);
461 ip->ip_off |= IP_DF;
462 ip->ip_off = htons(ip->ip_off);
463 }
464 }
465 }
466
467 #ifdef DEV_ENC
468 /* pass the mbuf to enc0 for bpf processing */
469 ipsec_bpf(m, sav, AF_INET);
470 #endif
471
472 /*
473 * Dispatch to the appropriate IPsec transform logic. The
474 * packet will be returned for transmission after crypto
475 * processing, etc. are completed. For encapsulation we
476 * bypass this call because of the explicit call done above
477 * (necessary to deal with IP_DF handling for IPv4).
478 *
479 * NB: m & sav are ``passed to caller'' who's reponsible for
480 * for reclaiming their resources.
481 */
482 if (sav->tdb_xform->xf_type != XF_IP4) {
483 ip = mtod(m, struct ip *);
484 i = ip->ip_hl << 2;
485 off = offsetof(struct ip, ip_p);
486 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
487 } else {
488 error = ipsec_process_done(m, isr);
489 }
490 IPSECREQUEST_UNLOCK(isr);
491 return error;
492 bad:
493 if (isr)
494 IPSECREQUEST_UNLOCK(isr);
495 if (m)
496 m_freem(m);
497 return error;
498 }
499 #endif
500
501 #ifdef INET6
502 /*
503 * Chop IP6 header from the payload.
504 */
505 static struct mbuf *
506 ipsec6_splithdr(struct mbuf *m)
507 {
508 struct mbuf *mh;
509 struct ip6_hdr *ip6;
510 int hlen;
511
512 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
513 ("first mbuf too short, len %u", m->m_len));
514 ip6 = mtod(m, struct ip6_hdr *);
515 hlen = sizeof(struct ip6_hdr);
516 if (m->m_len > hlen) {
517 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
518 if (!mh) {
519 m_freem(m);
520 return NULL;
521 }
522 M_MOVE_PKTHDR(mh, m);
523 MH_ALIGN(mh, hlen);
524 m->m_len -= hlen;
525 m->m_data += hlen;
526 mh->m_next = m;
527 m = mh;
528 m->m_len = hlen;
529 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
530 } else if (m->m_len < hlen) {
531 m = m_pullup(m, hlen);
532 if (!m)
533 return NULL;
534 }
535 return m;
536 }
537
538 /*
539 * IPsec output logic for IPv6, transport mode.
540 */
541 int
542 ipsec6_output_trans(
543 struct ipsec_output_state *state,
544 u_char *nexthdrp,
545 struct mbuf *mprev,
546 struct secpolicy *sp,
547 int flags,
548 int *tun)
549 {
550 struct ipsecrequest *isr;
551 struct secasindex saidx;
552 int error = 0;
553 struct mbuf *m;
554
555 IPSEC_ASSERT(state != NULL, ("null state"));
556 IPSEC_ASSERT(state->m != NULL, ("null m"));
557 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
558 IPSEC_ASSERT(mprev != NULL, ("null mprev"));
559 IPSEC_ASSERT(sp != NULL, ("null sp"));
560 IPSEC_ASSERT(tun != NULL, ("null tun"));
561
562 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
563 printf("%s: applied SP\n", __func__);
564 kdebug_secpolicy(sp));
565
566 isr = sp->req;
567 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
568 /* the rest will be handled by ipsec6_output_tunnel() */
569 *tun = 1; /* need tunnel-mode processing */
570 return 0;
571 }
572
573 *tun = 0;
574 m = state->m;
575
576 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
577 if (isr == NULL) {
578 #ifdef notdef
579 /* XXX should notification be done for all errors ? */
580 /*
581 * Notify the fact that the packet is discarded
582 * to ourselves. I believe this is better than
583 * just silently discarding. (jinmei@kame.net)
584 * XXX: should we restrict the error to TCP packets?
585 * XXX: should we directly notify sockets via
586 * pfctlinputs?
587 */
588 icmp6_error(m, ICMP6_DST_UNREACH,
589 ICMP6_DST_UNREACH_ADMIN, 0);
590 m = NULL; /* NB: icmp6_error frees mbuf */
591 #endif
592 goto bad;
593 }
594
595 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
596 sizeof (struct ip6_hdr),
597 offsetof(struct ip6_hdr, ip6_nxt));
598 bad:
599 if (m)
600 m_freem(m);
601 state->m = NULL;
602 return error;
603 }
604
605 static int
606 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
607 {
608 struct ip6_hdr *oip6;
609 struct ip6_hdr *ip6;
610 size_t plen;
611
612 /* can't tunnel between different AFs */
613 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
614 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
615 m_freem(m);
616 return EINVAL;
617 }
618 IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr),
619 ("mbuf wrong size; len %u", m->m_len));
620
621
622 /*
623 * grow the mbuf to accomodate the new IPv6 header.
624 */
625 plen = m->m_pkthdr.len;
626 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
627 struct mbuf *n;
628 MGET(n, M_DONTWAIT, MT_DATA);
629 if (!n) {
630 m_freem(m);
631 return ENOBUFS;
632 }
633 n->m_len = sizeof(struct ip6_hdr);
634 n->m_next = m->m_next;
635 m->m_next = n;
636 m->m_pkthdr.len += sizeof(struct ip6_hdr);
637 oip6 = mtod(n, struct ip6_hdr *);
638 } else {
639 m->m_next->m_len += sizeof(struct ip6_hdr);
640 m->m_next->m_data -= sizeof(struct ip6_hdr);
641 m->m_pkthdr.len += sizeof(struct ip6_hdr);
642 oip6 = mtod(m->m_next, struct ip6_hdr *);
643 }
644 ip6 = mtod(m, struct ip6_hdr *);
645 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
646
647 /* Fake link-local scope-class addresses */
648 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
649 oip6->ip6_src.s6_addr16[1] = 0;
650 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
651 oip6->ip6_dst.s6_addr16[1] = 0;
652
653 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
654 /* ECN consideration. */
655 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
656 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
657 ip6->ip6_plen = htons(plen);
658 else {
659 /* ip6->ip6_plen will be updated in ip6_output() */
660 }
661 ip6->ip6_nxt = IPPROTO_IPV6;
662 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src;
663 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst;
664 ip6->ip6_hlim = IPV6_DEFHLIM;
665
666 /* XXX Should ip6_src be updated later ? */
667
668 return 0;
669 }
670
671 /*
672 * IPsec output logic for IPv6, tunnel mode.
673 */
674 int
675 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
676 {
677 struct ip6_hdr *ip6;
678 struct ipsecrequest *isr;
679 struct secasindex saidx;
680 int error;
681 struct sockaddr_in6* dst6;
682 struct mbuf *m;
683
684 IPSEC_ASSERT(state != NULL, ("null state"));
685 IPSEC_ASSERT(state->m != NULL, ("null m"));
686 IPSEC_ASSERT(sp != NULL, ("null sp"));
687
688 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
689 printf("%s: applied SP\n", __func__);
690 kdebug_secpolicy(sp));
691
692 m = state->m;
693 /*
694 * transport mode ipsec (before the 1st tunnel mode) is already
695 * processed by ipsec6_output_trans().
696 */
697 for (isr = sp->req; isr; isr = isr->next) {
698 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
699 break;
700 }
701 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
702 if (isr == NULL)
703 goto bad;
704
705 /*
706 * There may be the case that SA status will be changed when
707 * we are refering to one. So calling splsoftnet().
708 */
709 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
710 /*
711 * build IPsec tunnel.
712 */
713 /* XXX should be processed with other familiy */
714 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
715 ipseclog((LOG_ERR, "%s: family mismatched between "
716 "inner and outer, spi=%u\n", __func__,
717 ntohl(isr->sav->spi)));
718 newipsecstat.ips_out_inval++;
719 error = EAFNOSUPPORT;
720 goto bad;
721 }
722
723 m = ipsec6_splithdr(m);
724 if (!m) {
725 newipsecstat.ips_out_nomem++;
726 error = ENOMEM;
727 goto bad;
728 }
729 error = ipsec6_encapsulate(m, isr->sav);
730 if (error) {
731 m = NULL;
732 goto bad;
733 }
734 ip6 = mtod(m, struct ip6_hdr *);
735
736 state->ro = &isr->sav->sah->sa_route;
737 state->dst = (struct sockaddr *)&state->ro->ro_dst;
738 dst6 = (struct sockaddr_in6 *)state->dst;
739 if (state->ro->ro_rt
740 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
741 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
742 RTFREE(state->ro->ro_rt);
743 state->ro->ro_rt = NULL;
744 }
745 if (state->ro->ro_rt == 0) {
746 bzero(dst6, sizeof(*dst6));
747 dst6->sin6_family = AF_INET6;
748 dst6->sin6_len = sizeof(*dst6);
749 dst6->sin6_addr = ip6->ip6_dst;
750 rtalloc(state->ro);
751 }
752 if (state->ro->ro_rt == 0) {
753 ip6stat.ip6s_noroute++;
754 newipsecstat.ips_out_noroute++;
755 error = EHOSTUNREACH;
756 goto bad;
757 }
758
759 /* adjust state->dst if tunnel endpoint is offlink */
760 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
761 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
762 dst6 = (struct sockaddr_in6 *)state->dst;
763 }
764 }
765
766 m = ipsec6_splithdr(m);
767 if (!m) {
768 newipsecstat.ips_out_nomem++;
769 error = ENOMEM;
770 goto bad;
771 }
772 ip6 = mtod(m, struct ip6_hdr *);
773 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
774 sizeof (struct ip6_hdr),
775 offsetof(struct ip6_hdr, ip6_nxt));
776 bad:
777 if (m)
778 m_freem(m);
779 state->m = NULL;
780 return error;
781 }
782 #endif /*INET6*/
Cache object: 089ea3a80235528ee472a2a09070e616
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