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/5.2/sys/netipsec/ipsec_output.c 120585 2003-09-29 22:57:43Z sam $
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 IPSEC_SPLASSERT_SOFTNET(__func__);
93
94 IPSEC_ASSERT(m != NULL, ("null mbuf"));
95 IPSEC_ASSERT(isr != NULL, ("null ISR"));
96 sav = isr->sav;
97 IPSEC_ASSERT(sav != NULL, ("null SA"));
98 IPSEC_ASSERT(sav->sah != NULL, ("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(("%s: unknown protocol family %u\n", __func__,
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(("%s: could not get packet tag\n", __func__));
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 IPSEC_SPLASSERT_SOFTNET(__func__);
207 IPSECREQUEST_LOCK_ASSERT(isr);
208
209 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
210 ("invalid address family %u", af));
211 again:
212 /*
213 * Craft SA index to search for proper SA. Note that
214 * we only fillin unspecified SA peers for transport
215 * mode; for tunnel mode they must already be filled in.
216 */
217 *saidx = isr->saidx;
218 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
219 /* Fillin unspecified SA peers only for transport mode */
220 if (af == AF_INET) {
221 struct sockaddr_in *sin;
222 struct ip *ip = mtod(m, struct ip *);
223
224 if (saidx->src.sa.sa_len == 0) {
225 sin = &saidx->src.sin;
226 sin->sin_len = sizeof(*sin);
227 sin->sin_family = AF_INET;
228 sin->sin_port = IPSEC_PORT_ANY;
229 sin->sin_addr = ip->ip_src;
230 }
231 if (saidx->dst.sa.sa_len == 0) {
232 sin = &saidx->dst.sin;
233 sin->sin_len = sizeof(*sin);
234 sin->sin_family = AF_INET;
235 sin->sin_port = IPSEC_PORT_ANY;
236 sin->sin_addr = ip->ip_dst;
237 }
238 } else {
239 struct sockaddr_in6 *sin6;
240 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
241
242 if (saidx->src.sin6.sin6_len == 0) {
243 sin6 = (struct sockaddr_in6 *)&saidx->src;
244 sin6->sin6_len = sizeof(*sin6);
245 sin6->sin6_family = AF_INET6;
246 sin6->sin6_port = IPSEC_PORT_ANY;
247 sin6->sin6_addr = ip6->ip6_src;
248 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
249 /* fix scope id for comparing SPD */
250 sin6->sin6_addr.s6_addr16[1] = 0;
251 sin6->sin6_scope_id =
252 ntohs(ip6->ip6_src.s6_addr16[1]);
253 }
254 }
255 if (saidx->dst.sin6.sin6_len == 0) {
256 sin6 = (struct sockaddr_in6 *)&saidx->dst;
257 sin6->sin6_len = sizeof(*sin6);
258 sin6->sin6_family = AF_INET6;
259 sin6->sin6_port = IPSEC_PORT_ANY;
260 sin6->sin6_addr = ip6->ip6_dst;
261 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
262 /* fix scope id for comparing SPD */
263 sin6->sin6_addr.s6_addr16[1] = 0;
264 sin6->sin6_scope_id =
265 ntohs(ip6->ip6_dst.s6_addr16[1]);
266 }
267 }
268 }
269 }
270
271 /*
272 * Lookup SA and validate it.
273 */
274 *error = key_checkrequest(isr, saidx);
275 if (*error != 0) {
276 /*
277 * IPsec processing is required, but no SA found.
278 * I assume that key_acquire() had been called
279 * to get/establish the SA. Here I discard
280 * this packet because it is responsibility for
281 * upper layer to retransmit the packet.
282 */
283 newipsecstat.ips_out_nosa++;
284 goto bad;
285 }
286 sav = isr->sav;
287 if (sav == NULL) { /* XXX valid return */
288 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
289 ("no SA found, but required; level %u",
290 ipsec_get_reqlevel(isr)));
291 IPSECREQUEST_UNLOCK(isr);
292 isr = isr->next;
293 if (isr == NULL) {
294 /*XXXstatistic??*/
295 *error = EINVAL; /*XXX*/
296 return isr;
297 }
298 IPSECREQUEST_LOCK(isr);
299 goto again;
300 }
301
302 /*
303 * Check system global policy controls.
304 */
305 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
306 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
307 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
308 DPRINTF(("%s: IPsec outbound packet dropped due"
309 " to policy (check your sysctls)\n", __func__));
310 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
311 ipcompstat.ipcomps_pdrops);
312 *error = EHOSTUNREACH;
313 goto bad;
314 }
315
316 /*
317 * Sanity check the SA contents for the caller
318 * before they invoke the xform output method.
319 */
320 if (sav->tdb_xform == NULL) {
321 DPRINTF(("%s: no transform for SA\n", __func__));
322 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
323 ipcompstat.ipcomps_noxform);
324 *error = EHOSTUNREACH;
325 goto bad;
326 }
327 return isr;
328 bad:
329 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
330 IPSECREQUEST_UNLOCK(isr);
331 return NULL;
332 #undef IPSEC_OSTAT
333 }
334
335 #ifdef INET
336 /*
337 * IPsec output logic for IPv4.
338 */
339 int
340 ipsec4_process_packet(
341 struct mbuf *m,
342 struct ipsecrequest *isr,
343 int flags,
344 int tunalready)
345 {
346 struct secasindex saidx;
347 struct secasvar *sav;
348 struct ip *ip;
349 int error, i, off;
350
351 IPSEC_ASSERT(m != NULL, ("null mbuf"));
352 IPSEC_ASSERT(isr != NULL, ("null isr"));
353
354 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
355
356 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
357 if (isr == NULL)
358 goto bad;
359
360 sav = isr->sav;
361 if (!tunalready) {
362 union sockaddr_union *dst = &sav->sah->saidx.dst;
363 int setdf;
364
365 /*
366 * Collect IP_DF state from the outer header.
367 */
368 if (dst->sa.sa_family == AF_INET) {
369 if (m->m_len < sizeof (struct ip) &&
370 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
371 error = ENOBUFS;
372 goto bad;
373 }
374 ip = mtod(m, struct ip *);
375 /* Honor system-wide control of how to handle IP_DF */
376 switch (ip4_ipsec_dfbit) {
377 case 0: /* clear in outer header */
378 case 1: /* set in outer header */
379 setdf = ip4_ipsec_dfbit;
380 break;
381 default: /* propagate to outer header */
382 setdf = ntohs(ip->ip_off & IP_DF);
383 break;
384 }
385 } else {
386 ip = NULL; /* keep compiler happy */
387 setdf = 0;
388 }
389 /* Do the appropriate encapsulation, if necessary */
390 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
391 dst->sa.sa_family != AF_INET || /* PF mismatch */
392 #if 0
393 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
394 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
395 #endif
396 (dst->sa.sa_family == AF_INET && /* Proxy */
397 dst->sin.sin_addr.s_addr != INADDR_ANY &&
398 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
399 struct mbuf *mp;
400
401 /* Fix IPv4 header checksum and length */
402 if (m->m_len < sizeof (struct ip) &&
403 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
404 error = ENOBUFS;
405 goto bad;
406 }
407 ip = mtod(m, struct ip *);
408 ip->ip_len = htons(m->m_pkthdr.len);
409 ip->ip_sum = 0;
410 #ifdef _IP_VHL
411 if (ip->ip_vhl == IP_VHL_BORING)
412 ip->ip_sum = in_cksum_hdr(ip);
413 else
414 ip->ip_sum = in_cksum(m,
415 _IP_VHL_HL(ip->ip_vhl) << 2);
416 #else
417 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
418 #endif
419
420 /* Encapsulate the packet */
421 error = ipip_output(m, isr, &mp, 0, 0);
422 if (mp == NULL && !error) {
423 /* Should never happen. */
424 DPRINTF(("%s: ipip_output returns no mbuf and "
425 "no error!", __func__));
426 error = EFAULT;
427 }
428 if (error) {
429 if (mp)
430 m_freem(mp);
431 goto bad;
432 }
433 m = mp, mp = NULL;
434 /*
435 * ipip_output clears IP_DF in the new header. If
436 * we need to propagate IP_DF from the outer header,
437 * then we have to do it here.
438 *
439 * XXX shouldn't assume what ipip_output does.
440 */
441 if (dst->sa.sa_family == AF_INET && setdf) {
442 if (m->m_len < sizeof (struct ip) &&
443 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
444 error = ENOBUFS;
445 goto bad;
446 }
447 ip = mtod(m, struct ip *);
448 ip->ip_off = ntohs(ip->ip_off);
449 ip->ip_off |= IP_DF;
450 ip->ip_off = htons(ip->ip_off);
451 }
452 }
453 }
454
455 /*
456 * Dispatch to the appropriate IPsec transform logic. The
457 * packet will be returned for transmission after crypto
458 * processing, etc. are completed. For encapsulation we
459 * bypass this call because of the explicit call done above
460 * (necessary to deal with IP_DF handling for IPv4).
461 *
462 * NB: m & sav are ``passed to caller'' who's reponsible for
463 * for reclaiming their resources.
464 */
465 if (sav->tdb_xform->xf_type != XF_IP4) {
466 ip = mtod(m, struct ip *);
467 i = ip->ip_hl << 2;
468 off = offsetof(struct ip, ip_p);
469 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
470 } else {
471 error = ipsec_process_done(m, isr);
472 }
473 IPSECREQUEST_UNLOCK(isr);
474 return error;
475 bad:
476 if (isr)
477 IPSECREQUEST_UNLOCK(isr);
478 if (m)
479 m_freem(m);
480 return error;
481 }
482 #endif
483
484 #ifdef INET6
485 /*
486 * Chop IP6 header from the payload.
487 */
488 static struct mbuf *
489 ipsec6_splithdr(struct mbuf *m)
490 {
491 struct mbuf *mh;
492 struct ip6_hdr *ip6;
493 int hlen;
494
495 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
496 ("first mbuf too short, len %u", m->m_len));
497 ip6 = mtod(m, struct ip6_hdr *);
498 hlen = sizeof(struct ip6_hdr);
499 if (m->m_len > hlen) {
500 MGETHDR(mh, M_DONTWAIT, MT_HEADER);
501 if (!mh) {
502 m_freem(m);
503 return NULL;
504 }
505 M_MOVE_PKTHDR(mh, m);
506 MH_ALIGN(mh, hlen);
507 m->m_len -= hlen;
508 m->m_data += hlen;
509 mh->m_next = m;
510 m = mh;
511 m->m_len = hlen;
512 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
513 } else if (m->m_len < hlen) {
514 m = m_pullup(m, hlen);
515 if (!m)
516 return NULL;
517 }
518 return m;
519 }
520
521 /*
522 * IPsec output logic for IPv6, transport mode.
523 */
524 int
525 ipsec6_output_trans(
526 struct ipsec_output_state *state,
527 u_char *nexthdrp,
528 struct mbuf *mprev,
529 struct secpolicy *sp,
530 int flags,
531 int *tun)
532 {
533 struct ipsecrequest *isr;
534 struct secasindex saidx;
535 int error = 0;
536 struct mbuf *m;
537
538 IPSEC_ASSERT(state != NULL, ("null state"));
539 IPSEC_ASSERT(state->m != NULL, ("null m"));
540 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
541 IPSEC_ASSERT(mprev != NULL, ("null mprev"));
542 IPSEC_ASSERT(sp != NULL, ("null sp"));
543 IPSEC_ASSERT(tun != NULL, ("null tun"));
544
545 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
546 printf("%s: applyed SP\n", __func__);
547 kdebug_secpolicy(sp));
548
549 isr = sp->req;
550 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
551 /* the rest will be handled by ipsec6_output_tunnel() */
552 *tun = 1; /* need tunnel-mode processing */
553 return 0;
554 }
555
556 *tun = 0;
557 m = state->m;
558
559 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
560 if (isr == NULL) {
561 #ifdef notdef
562 /* XXX should notification be done for all errors ? */
563 /*
564 * Notify the fact that the packet is discarded
565 * to ourselves. I believe this is better than
566 * just silently discarding. (jinmei@kame.net)
567 * XXX: should we restrict the error to TCP packets?
568 * XXX: should we directly notify sockets via
569 * pfctlinputs?
570 */
571 icmp6_error(m, ICMP6_DST_UNREACH,
572 ICMP6_DST_UNREACH_ADMIN, 0);
573 m = NULL; /* NB: icmp6_error frees mbuf */
574 #endif
575 goto bad;
576 }
577
578 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
579 sizeof (struct ip6_hdr),
580 offsetof(struct ip6_hdr, ip6_nxt));
581 bad:
582 if (m)
583 m_freem(m);
584 state->m = NULL;
585 return error;
586 }
587
588 static int
589 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
590 {
591 struct ip6_hdr *oip6;
592 struct ip6_hdr *ip6;
593 size_t plen;
594
595 /* can't tunnel between different AFs */
596 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
597 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
598 m_freem(m);
599 return EINVAL;
600 }
601 IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr),
602 ("mbuf wrong size; len %u", m->m_len));
603
604
605 /*
606 * grow the mbuf to accomodate the new IPv6 header.
607 */
608 plen = m->m_pkthdr.len;
609 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
610 struct mbuf *n;
611 MGET(n, M_DONTWAIT, MT_DATA);
612 if (!n) {
613 m_freem(m);
614 return ENOBUFS;
615 }
616 n->m_len = sizeof(struct ip6_hdr);
617 n->m_next = m->m_next;
618 m->m_next = n;
619 m->m_pkthdr.len += sizeof(struct ip6_hdr);
620 oip6 = mtod(n, struct ip6_hdr *);
621 } else {
622 m->m_next->m_len += sizeof(struct ip6_hdr);
623 m->m_next->m_data -= sizeof(struct ip6_hdr);
624 m->m_pkthdr.len += sizeof(struct ip6_hdr);
625 oip6 = mtod(m->m_next, struct ip6_hdr *);
626 }
627 ip6 = mtod(m, struct ip6_hdr *);
628 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
629
630 /* Fake link-local scope-class addresses */
631 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
632 oip6->ip6_src.s6_addr16[1] = 0;
633 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
634 oip6->ip6_dst.s6_addr16[1] = 0;
635
636 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
637 /* ECN consideration. */
638 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
639 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
640 ip6->ip6_plen = htons(plen);
641 else {
642 /* ip6->ip6_plen will be updated in ip6_output() */
643 }
644 ip6->ip6_nxt = IPPROTO_IPV6;
645 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src;
646 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst;
647 ip6->ip6_hlim = IPV6_DEFHLIM;
648
649 /* XXX Should ip6_src be updated later ? */
650
651 return 0;
652 }
653
654 /*
655 * IPsec output logic for IPv6, tunnel mode.
656 */
657 int
658 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
659 {
660 struct ip6_hdr *ip6;
661 struct ipsecrequest *isr;
662 struct secasindex saidx;
663 int error;
664 struct sockaddr_in6* dst6;
665 struct mbuf *m;
666
667 IPSEC_ASSERT(state != NULL, ("null state"));
668 IPSEC_ASSERT(state->m != NULL, ("null m"));
669 IPSEC_ASSERT(sp != NULL, ("null sp"));
670
671 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
672 printf("%s: applyed SP\n", __func__);
673 kdebug_secpolicy(sp));
674
675 m = state->m;
676 /*
677 * transport mode ipsec (before the 1st tunnel mode) is already
678 * processed by ipsec6_output_trans().
679 */
680 for (isr = sp->req; isr; isr = isr->next) {
681 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
682 break;
683 }
684 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
685 if (isr == NULL)
686 goto bad;
687
688 /*
689 * There may be the case that SA status will be changed when
690 * we are refering to one. So calling splsoftnet().
691 */
692 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
693 /*
694 * build IPsec tunnel.
695 */
696 /* XXX should be processed with other familiy */
697 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
698 ipseclog((LOG_ERR, "%s: family mismatched between "
699 "inner and outer, spi=%u\n", __func__,
700 ntohl(isr->sav->spi)));
701 newipsecstat.ips_out_inval++;
702 error = EAFNOSUPPORT;
703 goto bad;
704 }
705
706 m = ipsec6_splithdr(m);
707 if (!m) {
708 newipsecstat.ips_out_nomem++;
709 error = ENOMEM;
710 goto bad;
711 }
712 error = ipsec6_encapsulate(m, isr->sav);
713 if (error) {
714 m = NULL;
715 goto bad;
716 }
717 ip6 = mtod(m, struct ip6_hdr *);
718
719 state->ro = &isr->sav->sah->sa_route;
720 state->dst = (struct sockaddr *)&state->ro->ro_dst;
721 dst6 = (struct sockaddr_in6 *)state->dst;
722 if (state->ro->ro_rt
723 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
724 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
725 RTFREE(state->ro->ro_rt);
726 state->ro->ro_rt = NULL;
727 }
728 if (state->ro->ro_rt == 0) {
729 bzero(dst6, sizeof(*dst6));
730 dst6->sin6_family = AF_INET6;
731 dst6->sin6_len = sizeof(*dst6);
732 dst6->sin6_addr = ip6->ip6_dst;
733 rtalloc(state->ro);
734 }
735 if (state->ro->ro_rt == 0) {
736 ip6stat.ip6s_noroute++;
737 newipsecstat.ips_out_noroute++;
738 error = EHOSTUNREACH;
739 goto bad;
740 }
741
742 /* adjust state->dst if tunnel endpoint is offlink */
743 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
744 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
745 dst6 = (struct sockaddr_in6 *)state->dst;
746 }
747 }
748
749 m = ipsec6_splithdr(m);
750 if (!m) {
751 newipsecstat.ips_out_nomem++;
752 error = ENOMEM;
753 goto bad;
754 }
755 ip6 = mtod(m, struct ip6_hdr *);
756 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
757 sizeof (struct ip6_hdr),
758 offsetof(struct ip6_hdr, ip6_nxt));
759 bad:
760 if (m)
761 m_freem(m);
762 state->m = NULL;
763 return error;
764 }
765 #endif /*INET6*/
Cache object: 8e9c101d00bfe8acabe5b458c89de867
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