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 #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 #ifdef DEV_ENC
86 #include <net/if_enc.h>
87 #endif
88
89
90 int
91 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
92 {
93 struct tdb_ident *tdbi;
94 struct m_tag *mtag;
95 struct secasvar *sav;
96 struct secasindex *saidx;
97 int error;
98
99 IPSEC_SPLASSERT_SOFTNET(__func__);
100
101 IPSEC_ASSERT(m != NULL, ("null mbuf"));
102 IPSEC_ASSERT(isr != NULL, ("null ISR"));
103 sav = isr->sav;
104 IPSEC_ASSERT(sav != NULL, ("null SA"));
105 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
106
107 saidx = &sav->sah->saidx;
108 switch (saidx->dst.sa.sa_family) {
109 #ifdef INET
110 case AF_INET:
111 /* Fix the header length, for AH processing. */
112 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
113 break;
114 #endif /* INET */
115 #ifdef INET6
116 case AF_INET6:
117 /* Fix the header length, for AH processing. */
118 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
119 error = ENXIO;
120 goto bad;
121 }
122 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
123 /* No jumbogram support. */
124 error = ENXIO; /*?*/
125 goto bad;
126 }
127 mtod(m, struct ip6_hdr *)->ip6_plen =
128 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
129 break;
130 #endif /* INET6 */
131 default:
132 DPRINTF(("%s: unknown protocol family %u\n", __func__,
133 saidx->dst.sa.sa_family));
134 error = ENXIO;
135 goto bad;
136 }
137
138 /*
139 * Add a record of what we've done or what needs to be done to the
140 * packet.
141 */
142 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
143 sizeof(struct tdb_ident), M_NOWAIT);
144 if (mtag == NULL) {
145 DPRINTF(("%s: could not get packet tag\n", __func__));
146 error = ENOMEM;
147 goto bad;
148 }
149
150 tdbi = (struct tdb_ident *)(mtag + 1);
151 tdbi->dst = saidx->dst;
152 tdbi->proto = saidx->proto;
153 tdbi->spi = sav->spi;
154 m_tag_prepend(m, mtag);
155
156 /*
157 * If there's another (bundled) SA to apply, do so.
158 * Note that this puts a burden on the kernel stack size.
159 * If this is a problem we'll need to introduce a queue
160 * to set the packet on so we can unwind the stack before
161 * doing further processing.
162 */
163 if (isr->next) {
164 ipsec4stat.ips_out_bundlesa++;
165 return ipsec4_process_packet(m, isr->next, 0, 0);
166 }
167 key_sa_recordxfer(sav, m); /* record data transfer */
168
169 /*
170 * We're done with IPsec processing, transmit the packet using the
171 * appropriate network protocol (IP or IPv6). SPD lookup will be
172 * performed again there.
173 */
174 switch (saidx->dst.sa.sa_family) {
175 #ifdef INET
176 struct ip *ip;
177 case AF_INET:
178 ip = mtod(m, struct ip *);
179 ip->ip_len = ntohs(ip->ip_len);
180 ip->ip_off = ntohs(ip->ip_off);
181
182 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
183 #endif /* INET */
184 #ifdef INET6
185 case AF_INET6:
186 /*
187 * We don't need massage, IPv6 header fields are always in
188 * net endian.
189 */
190 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
191 #endif /* INET6 */
192 }
193 panic("ipsec_process_done");
194 bad:
195 m_freem(m);
196 KEY_FREESAV(&sav);
197 return (error);
198 }
199
200 static struct ipsecrequest *
201 ipsec_nextisr(
202 struct mbuf *m,
203 struct ipsecrequest *isr,
204 int af,
205 struct secasindex *saidx,
206 int *error
207 )
208 {
209 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
210 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
211 struct secasvar *sav;
212
213 IPSEC_SPLASSERT_SOFTNET(__func__);
214 IPSECREQUEST_LOCK_ASSERT(isr);
215
216 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
217 ("invalid address family %u", af));
218 again:
219 /*
220 * Craft SA index to search for proper SA. Note that
221 * we only fillin unspecified SA peers for transport
222 * mode; for tunnel mode they must already be filled in.
223 */
224 *saidx = isr->saidx;
225 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
226 /* Fillin unspecified SA peers only for transport mode */
227 if (af == AF_INET) {
228 struct sockaddr_in *sin;
229 struct ip *ip = mtod(m, struct ip *);
230
231 if (saidx->src.sa.sa_len == 0) {
232 sin = &saidx->src.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_src;
237 }
238 if (saidx->dst.sa.sa_len == 0) {
239 sin = &saidx->dst.sin;
240 sin->sin_len = sizeof(*sin);
241 sin->sin_family = AF_INET;
242 sin->sin_port = IPSEC_PORT_ANY;
243 sin->sin_addr = ip->ip_dst;
244 }
245 } else {
246 struct sockaddr_in6 *sin6;
247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
248
249 if (saidx->src.sin6.sin6_len == 0) {
250 sin6 = (struct sockaddr_in6 *)&saidx->src;
251 sin6->sin6_len = sizeof(*sin6);
252 sin6->sin6_family = AF_INET6;
253 sin6->sin6_port = IPSEC_PORT_ANY;
254 sin6->sin6_addr = ip6->ip6_src;
255 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
256 /* fix scope id for comparing SPD */
257 sin6->sin6_addr.s6_addr16[1] = 0;
258 sin6->sin6_scope_id =
259 ntohs(ip6->ip6_src.s6_addr16[1]);
260 }
261 }
262 if (saidx->dst.sin6.sin6_len == 0) {
263 sin6 = (struct sockaddr_in6 *)&saidx->dst;
264 sin6->sin6_len = sizeof(*sin6);
265 sin6->sin6_family = AF_INET6;
266 sin6->sin6_port = IPSEC_PORT_ANY;
267 sin6->sin6_addr = ip6->ip6_dst;
268 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
269 /* fix scope id for comparing SPD */
270 sin6->sin6_addr.s6_addr16[1] = 0;
271 sin6->sin6_scope_id =
272 ntohs(ip6->ip6_dst.s6_addr16[1]);
273 }
274 }
275 }
276 }
277
278 /*
279 * Lookup SA and validate it.
280 */
281 *error = key_checkrequest(isr, saidx);
282 if (*error != 0) {
283 /*
284 * IPsec processing is required, but no SA found.
285 * I assume that key_acquire() had been called
286 * to get/establish the SA. Here I discard
287 * this packet because it is responsibility for
288 * upper layer to retransmit the packet.
289 */
290 ipsec4stat.ips_out_nosa++;
291 goto bad;
292 }
293 sav = isr->sav;
294 if (sav == NULL) {
295 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
296 ("no SA found, but required; level %u",
297 ipsec_get_reqlevel(isr)));
298 IPSECREQUEST_UNLOCK(isr);
299 isr = isr->next;
300 /*
301 * If isr is NULL, we found a 'use' policy w/o SA.
302 * Return w/o error and w/o isr so we can drop out
303 * and continue w/o IPsec processing.
304 */
305 if (isr == NULL)
306 return isr;
307 IPSECREQUEST_LOCK(isr);
308 goto again;
309 }
310
311 /*
312 * Check system global policy controls.
313 */
314 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
315 (isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
316 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
317 DPRINTF(("%s: IPsec outbound packet dropped due"
318 " to policy (check your sysctls)\n", __func__));
319 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
320 ipcompstat.ipcomps_pdrops);
321 *error = EHOSTUNREACH;
322 goto bad;
323 }
324
325 /*
326 * Sanity check the SA contents for the caller
327 * before they invoke the xform output method.
328 */
329 if (sav->tdb_xform == NULL) {
330 DPRINTF(("%s: no transform for SA\n", __func__));
331 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
332 ipcompstat.ipcomps_noxform);
333 *error = EHOSTUNREACH;
334 goto bad;
335 }
336 return isr;
337 bad:
338 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
339 IPSECREQUEST_UNLOCK(isr);
340 return NULL;
341 #undef IPSEC_OSTAT
342 }
343
344 #ifdef INET
345 /*
346 * IPsec output logic for IPv4.
347 */
348 int
349 ipsec4_process_packet(
350 struct mbuf *m,
351 struct ipsecrequest *isr,
352 int flags,
353 int tunalready)
354 {
355 struct secasindex saidx;
356 struct secasvar *sav;
357 struct ip *ip;
358 int error, i, off;
359
360 IPSEC_ASSERT(m != NULL, ("null mbuf"));
361 IPSEC_ASSERT(isr != NULL, ("null isr"));
362
363 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
364
365 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
366 if (isr == NULL) {
367 if (error != 0)
368 goto bad;
369 return EJUSTRETURN;
370 }
371
372 sav = isr->sav;
373
374 #ifdef DEV_ENC
375 encif->if_opackets++;
376 encif->if_obytes += m->m_pkthdr.len;
377
378 /* pass the mbuf to enc0 for bpf processing */
379 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
380 /* pass the mbuf to enc0 for packet filtering */
381 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
382 goto bad;
383 #endif
384
385 if (!tunalready) {
386 union sockaddr_union *dst = &sav->sah->saidx.dst;
387 int setdf;
388
389 /*
390 * Collect IP_DF state from the outer header.
391 */
392 if (dst->sa.sa_family == AF_INET) {
393 if (m->m_len < sizeof (struct ip) &&
394 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
395 error = ENOBUFS;
396 goto bad;
397 }
398 ip = mtod(m, struct ip *);
399 /* Honor system-wide control of how to handle IP_DF */
400 switch (ip4_ipsec_dfbit) {
401 case 0: /* clear in outer header */
402 case 1: /* set in outer header */
403 setdf = ip4_ipsec_dfbit;
404 break;
405 default: /* propagate to outer header */
406 setdf = ntohs(ip->ip_off & IP_DF);
407 break;
408 }
409 } else {
410 ip = NULL; /* keep compiler happy */
411 setdf = 0;
412 }
413 /* Do the appropriate encapsulation, if necessary */
414 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
415 dst->sa.sa_family != AF_INET || /* PF mismatch */
416 #if 0
417 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
418 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
419 #endif
420 (dst->sa.sa_family == AF_INET && /* Proxy */
421 dst->sin.sin_addr.s_addr != INADDR_ANY &&
422 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
423 struct mbuf *mp;
424
425 /* Fix IPv4 header checksum and length */
426 if (m->m_len < sizeof (struct ip) &&
427 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
428 error = ENOBUFS;
429 goto bad;
430 }
431 ip = mtod(m, struct ip *);
432 ip->ip_len = htons(m->m_pkthdr.len);
433 ip->ip_sum = 0;
434 #ifdef _IP_VHL
435 if (ip->ip_vhl == IP_VHL_BORING)
436 ip->ip_sum = in_cksum_hdr(ip);
437 else
438 ip->ip_sum = in_cksum(m,
439 _IP_VHL_HL(ip->ip_vhl) << 2);
440 #else
441 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
442 #endif
443
444 /* Encapsulate the packet */
445 error = ipip_output(m, isr, &mp, 0, 0);
446 if (mp == NULL && !error) {
447 /* Should never happen. */
448 DPRINTF(("%s: ipip_output returns no mbuf and "
449 "no error!", __func__));
450 error = EFAULT;
451 }
452 if (error) {
453 if (mp) {
454 /* XXX: Should never happen! */
455 m_freem(mp);
456 }
457 m = NULL; /* ipip_output() already freed it */
458 goto bad;
459 }
460 m = mp, mp = NULL;
461 /*
462 * ipip_output clears IP_DF in the new header. If
463 * we need to propagate IP_DF from the outer header,
464 * then we have to do it here.
465 *
466 * XXX shouldn't assume what ipip_output does.
467 */
468 if (dst->sa.sa_family == AF_INET && setdf) {
469 if (m->m_len < sizeof (struct ip) &&
470 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
471 error = ENOBUFS;
472 goto bad;
473 }
474 ip = mtod(m, struct ip *);
475 ip->ip_off = ntohs(ip->ip_off);
476 ip->ip_off |= IP_DF;
477 ip->ip_off = htons(ip->ip_off);
478 }
479 }
480 }
481
482 #ifdef DEV_ENC
483 /* pass the mbuf to enc0 for bpf processing */
484 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER);
485 /* pass the mbuf to enc0 for packet filtering */
486 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
487 goto bad;
488 #endif
489
490 /*
491 * Dispatch to the appropriate IPsec transform logic. The
492 * packet will be returned for transmission after crypto
493 * processing, etc. are completed. For encapsulation we
494 * bypass this call because of the explicit call done above
495 * (necessary to deal with IP_DF handling for IPv4).
496 *
497 * NB: m & sav are ``passed to caller'' who's reponsible for
498 * for reclaiming their resources.
499 */
500 if (sav->tdb_xform->xf_type != XF_IP4) {
501 ip = mtod(m, struct ip *);
502 i = ip->ip_hl << 2;
503 off = offsetof(struct ip, ip_p);
504 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
505 } else {
506 error = ipsec_process_done(m, isr);
507 }
508 IPSECREQUEST_UNLOCK(isr);
509 return error;
510 bad:
511 if (isr)
512 IPSECREQUEST_UNLOCK(isr);
513 if (m)
514 m_freem(m);
515 return error;
516 }
517 #endif
518
519 #ifdef INET6
520 /*
521 * Chop IP6 header from the payload.
522 */
523 static struct mbuf *
524 ipsec6_splithdr(struct mbuf *m)
525 {
526 struct mbuf *mh;
527 struct ip6_hdr *ip6;
528 int hlen;
529
530 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
531 ("first mbuf too short, len %u", m->m_len));
532 ip6 = mtod(m, struct ip6_hdr *);
533 hlen = sizeof(struct ip6_hdr);
534 if (m->m_len > hlen) {
535 MGETHDR(mh, M_DONTWAIT, MT_DATA);
536 if (!mh) {
537 m_freem(m);
538 return NULL;
539 }
540 M_MOVE_PKTHDR(mh, m);
541 MH_ALIGN(mh, hlen);
542 m->m_len -= hlen;
543 m->m_data += hlen;
544 mh->m_next = m;
545 m = mh;
546 m->m_len = hlen;
547 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
548 } else if (m->m_len < hlen) {
549 m = m_pullup(m, hlen);
550 if (!m)
551 return NULL;
552 }
553 return m;
554 }
555
556 /*
557 * IPsec output logic for IPv6, transport mode.
558 */
559 int
560 ipsec6_output_trans(
561 struct ipsec_output_state *state,
562 u_char *nexthdrp,
563 struct mbuf *mprev,
564 struct secpolicy *sp,
565 int flags,
566 int *tun)
567 {
568 struct ipsecrequest *isr;
569 struct secasindex saidx;
570 int error = 0;
571 struct mbuf *m;
572
573 IPSEC_ASSERT(state != NULL, ("null state"));
574 IPSEC_ASSERT(state->m != NULL, ("null m"));
575 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
576 IPSEC_ASSERT(mprev != NULL, ("null mprev"));
577 IPSEC_ASSERT(sp != NULL, ("null sp"));
578 IPSEC_ASSERT(tun != NULL, ("null tun"));
579
580 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
581 printf("%s: applied SP\n", __func__);
582 kdebug_secpolicy(sp));
583
584 isr = sp->req;
585 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
586 /* the rest will be handled by ipsec6_output_tunnel() */
587 *tun = 1; /* need tunnel-mode processing */
588 return 0;
589 }
590
591 *tun = 0;
592 m = state->m;
593
594 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
595 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
596 if (isr == NULL) {
597 if (error != 0) {
598 #ifdef notdef
599 /* XXX should notification be done for all errors ? */
600 /*
601 * Notify the fact that the packet is discarded
602 * to ourselves. I believe this is better than
603 * just silently discarding. (jinmei@kame.net)
604 * XXX: should we restrict the error to TCP packets?
605 * XXX: should we directly notify sockets via
606 * pfctlinputs?
607 */
608 icmp6_error(m, ICMP6_DST_UNREACH,
609 ICMP6_DST_UNREACH_ADMIN, 0);
610 m = NULL; /* NB: icmp6_error frees mbuf */
611 #endif
612 goto bad;
613 }
614 return EJUSTRETURN;
615 }
616
617 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
618 sizeof (struct ip6_hdr),
619 offsetof(struct ip6_hdr,
620 ip6_nxt));
621 IPSECREQUEST_UNLOCK(isr);
622 return error;
623 bad:
624 if (isr)
625 IPSECREQUEST_UNLOCK(isr);
626 if (m)
627 m_freem(m);
628 state->m = NULL;
629 return error;
630 }
631
632 static int
633 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
634 {
635 struct ip6_hdr *oip6;
636 struct ip6_hdr *ip6;
637 size_t plen;
638
639 /* can't tunnel between different AFs */
640 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
641 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
642 m_freem(m);
643 return EINVAL;
644 }
645 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr),
646 ("mbuf wrong size; len %u", m->m_len));
647
648
649 /*
650 * grow the mbuf to accomodate the new IPv6 header.
651 */
652 plen = m->m_pkthdr.len;
653 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
654 struct mbuf *n;
655 MGET(n, M_DONTWAIT, MT_DATA);
656 if (!n) {
657 m_freem(m);
658 return ENOBUFS;
659 }
660 n->m_len = sizeof(struct ip6_hdr);
661 n->m_next = m->m_next;
662 m->m_next = n;
663 m->m_pkthdr.len += sizeof(struct ip6_hdr);
664 oip6 = mtod(n, struct ip6_hdr *);
665 } else {
666 m->m_next->m_len += sizeof(struct ip6_hdr);
667 m->m_next->m_data -= sizeof(struct ip6_hdr);
668 m->m_pkthdr.len += sizeof(struct ip6_hdr);
669 oip6 = mtod(m->m_next, struct ip6_hdr *);
670 }
671 ip6 = mtod(m, struct ip6_hdr *);
672 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
673
674 /* Fake link-local scope-class addresses */
675 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
676 oip6->ip6_src.s6_addr16[1] = 0;
677 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
678 oip6->ip6_dst.s6_addr16[1] = 0;
679
680 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
681 /* ECN consideration. */
682 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
683 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
684 ip6->ip6_plen = htons(plen);
685 else {
686 /* ip6->ip6_plen will be updated in ip6_output() */
687 }
688 ip6->ip6_nxt = IPPROTO_IPV6;
689 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr;
690 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr;
691 ip6->ip6_hlim = IPV6_DEFHLIM;
692
693 /* XXX Should ip6_src be updated later ? */
694
695 return 0;
696 }
697
698 /*
699 * IPsec output logic for IPv6, tunnel mode.
700 */
701 int
702 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
703 {
704 struct ip6_hdr *ip6;
705 struct ipsecrequest *isr;
706 struct secasindex saidx;
707 int error;
708 struct sockaddr_in6* dst6;
709 struct mbuf *m;
710
711 IPSEC_ASSERT(state != NULL, ("null state"));
712 IPSEC_ASSERT(state->m != NULL, ("null m"));
713 IPSEC_ASSERT(sp != NULL, ("null sp"));
714
715 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
716 printf("%s: applied SP\n", __func__);
717 kdebug_secpolicy(sp));
718
719 m = state->m;
720 /*
721 * transport mode ipsec (before the 1st tunnel mode) is already
722 * processed by ipsec6_output_trans().
723 */
724 for (isr = sp->req; isr; isr = isr->next) {
725 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
726 break;
727 }
728
729 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
730 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
731 if (isr == NULL) {
732 if (error != 0)
733 goto bad;
734 return EJUSTRETURN;
735 }
736
737 #ifdef DEV_ENC
738 /* pass the mbuf to enc0 for bpf processing */
739 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
740 /* pass the mbuf to enc0 for packet filtering */
741 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
742 goto bad;
743 #endif
744
745 /*
746 * There may be the case that SA status will be changed when
747 * we are refering to one. So calling splsoftnet().
748 */
749 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
750 /*
751 * build IPsec tunnel.
752 */
753 /* XXX should be processed with other familiy */
754 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
755 ipseclog((LOG_ERR, "%s: family mismatched between "
756 "inner and outer, spi=%u\n", __func__,
757 ntohl(isr->sav->spi)));
758 ipsec6stat.ips_out_inval++;
759 error = EAFNOSUPPORT;
760 goto bad;
761 }
762
763 m = ipsec6_splithdr(m);
764 if (!m) {
765 ipsec6stat.ips_out_nomem++;
766 error = ENOMEM;
767 goto bad;
768 }
769 error = ipsec6_encapsulate(m, isr->sav);
770 if (error) {
771 m = NULL;
772 goto bad;
773 }
774 ip6 = mtod(m, struct ip6_hdr *);
775
776 state->ro = &isr->sav->sah->sa_route;
777 state->dst = (struct sockaddr *)&state->ro->ro_dst;
778 dst6 = (struct sockaddr_in6 *)state->dst;
779 if (state->ro->ro_rt
780 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
781 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
782 RTFREE(state->ro->ro_rt);
783 state->ro->ro_rt = NULL;
784 }
785 if (state->ro->ro_rt == 0) {
786 bzero(dst6, sizeof(*dst6));
787 dst6->sin6_family = AF_INET6;
788 dst6->sin6_len = sizeof(*dst6);
789 dst6->sin6_addr = ip6->ip6_dst;
790 rtalloc(state->ro);
791 }
792 if (state->ro->ro_rt == 0) {
793 ip6stat.ip6s_noroute++;
794 ipsec6stat.ips_out_noroute++;
795 error = EHOSTUNREACH;
796 goto bad;
797 }
798
799 /* adjust state->dst if tunnel endpoint is offlink */
800 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
801 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
802 dst6 = (struct sockaddr_in6 *)state->dst;
803 }
804 }
805
806 m = ipsec6_splithdr(m);
807 if (!m) {
808 ipsec6stat.ips_out_nomem++;
809 error = ENOMEM;
810 goto bad;
811 }
812 ip6 = mtod(m, struct ip6_hdr *);
813
814 #ifdef DEV_ENC
815 /* pass the mbuf to enc0 for bpf processing */
816 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER);
817 /* pass the mbuf to enc0 for packet filtering */
818 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
819 goto bad;
820 #endif
821
822 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
823 sizeof (struct ip6_hdr),
824 offsetof(struct ip6_hdr, ip6_nxt));
825 IPSECREQUEST_UNLOCK(isr);
826 return error;
827 bad:
828 if (isr)
829 IPSECREQUEST_UNLOCK(isr);
830 if (m)
831 m_freem(m);
832 state->m = NULL;
833 return error;
834 }
835 #endif /*INET6*/
Cache object: 2685c3f1d6029927e4b3c2ea19425f92
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