2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
30 * IPsec output processing.
33 #include "opt_inet6.h"
34 #include "opt_ipsec.h"
37 #include <sys/param.h>
38 #include <sys/systm.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>
48 #include <net/route.h>
51 #include <netinet/in.h>
52 #include <netinet/in_systm.h>
53 #include <netinet/ip.h>
54 #include <netinet/ip_var.h>
55 #include <netinet/in_var.h>
56 #include <netinet/ip_ecn.h>
58 #include <netinet6/ip6_ecn.h>
61 #include <netinet/ip6.h>
63 #include <netinet6/ip6_var.h>
65 #include <netinet/in_pcb.h>
67 #include <netinet/icmp6.h>
70 #include <netipsec/ipsec.h>
72 #include <netipsec/ipsec6.h>
74 #include <netipsec/ah_var.h>
75 #include <netipsec/esp_var.h>
76 #include <netipsec/ipcomp_var.h>
78 #include <netipsec/xform.h>
80 #include <netipsec/key.h>
81 #include <netipsec/keydb.h>
82 #include <netipsec/key_debug.h>
84 #include <machine/in_cksum.h>
87 #include <netinet/udp.h>
91 #include <net/if_enc.h>
96 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
98 struct tdb_ident *tdbi;
100 struct secasvar *sav;
101 struct secasindex *saidx;
104 IPSEC_ASSERT(m != NULL, ("null mbuf"));
105 IPSEC_ASSERT(isr != NULL, ("null ISR"));
107 IPSEC_ASSERT(sav != NULL, ("null SA"));
108 IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
110 saidx = &sav->sah->saidx;
111 switch (saidx->dst.sa.sa_family) {
114 /* Fix the header length, for AH processing. */
115 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
120 /* Fix the header length, for AH processing. */
121 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
125 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
126 /* No jumbogram support. */
130 mtod(m, struct ip6_hdr *)->ip6_plen =
131 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
135 DPRINTF(("%s: unknown protocol family %u\n", __func__,
136 saidx->dst.sa.sa_family));
142 * Add a record of what we've done or what needs to be done to the
145 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
146 sizeof(struct tdb_ident), M_NOWAIT);
148 DPRINTF(("%s: could not get packet tag\n", __func__));
153 tdbi = (struct tdb_ident *)(mtag + 1);
154 tdbi->dst = saidx->dst;
155 tdbi->proto = saidx->proto;
156 tdbi->spi = sav->spi;
157 m_tag_prepend(m, mtag);
160 * If there's another (bundled) SA to apply, do so.
161 * Note that this puts a burden on the kernel stack size.
162 * If this is a problem we'll need to introduce a queue
163 * to set the packet on so we can unwind the stack before
164 * doing further processing.
167 IPSECSTAT_INC(ips_out_bundlesa);
168 /* XXX-BZ currently only support same AF bundles. */
169 switch (saidx->dst.sa.sa_family) {
172 return ipsec4_process_packet(m, isr->next, 0, 0);
179 ipsec6_output_trans()
180 ipsec6_output_tunnel()
185 DPRINTF(("%s: unknown protocol family %u\n", __func__,
186 saidx->dst.sa.sa_family));
191 key_sa_recordxfer(sav, m); /* record data transfer */
194 * We're done with IPsec processing, transmit the packet using the
195 * appropriate network protocol (IP or IPv6). SPD lookup will be
196 * performed again there.
198 switch (saidx->dst.sa.sa_family) {
203 * If NAT-T is enabled, now that all IPsec processing is done
204 * insert UDP encapsulation header after IP header.
206 if (sav->natt_type) {
207 struct ip *ip = mtod(m, struct ip *);
208 const int hlen = (ip->ip_hl << 2);
213 size = sizeof(struct udphdr);
214 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
216 * draft-ietf-ipsec-nat-t-ike-0[01].txt and
217 * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
218 * ignoring possible AH mode
219 * non-IKE marker + non-ESP marker
220 * from draft-ietf-ipsec-udp-encaps-00.txt.
222 size += sizeof(u_int64_t);
224 mi = m_makespace(m, hlen, size, &off);
226 DPRINTF(("%s: m_makespace for udphdr failed\n",
232 udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
233 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
234 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
237 KEY_PORTFROMSADDR(&sav->sah->saidx.src);
238 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
240 udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
241 ip->ip_len = htons(m->m_pkthdr.len);
242 ip->ip_p = IPPROTO_UDP;
244 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
245 *(u_int64_t *)(udp + 1) = 0;
247 #endif /* IPSEC_NAT_T */
249 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
254 * We don't need massage, IPv6 header fields are always in
257 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
260 panic("ipsec_process_done");
266 static struct ipsecrequest *
269 struct ipsecrequest *isr,
271 struct secasindex *saidx,
275 #define IPSEC_OSTAT(name) do { \
276 if (isr->saidx.proto == IPPROTO_ESP) \
277 ESPSTAT_INC(esps_##name); \
278 else if (isr->saidx.proto == IPPROTO_AH)\
279 AHSTAT_INC(ahs_##name); \
281 IPCOMPSTAT_INC(ipcomps_##name); \
283 struct secasvar *sav;
285 IPSECREQUEST_LOCK_ASSERT(isr);
287 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
288 ("invalid address family %u", af));
291 * Craft SA index to search for proper SA. Note that
292 * we only fillin unspecified SA peers for transport
293 * mode; for tunnel mode they must already be filled in.
296 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
297 /* Fillin unspecified SA peers only for transport mode */
299 struct sockaddr_in *sin;
300 struct ip *ip = mtod(m, struct ip *);
302 if (saidx->src.sa.sa_len == 0) {
303 sin = &saidx->src.sin;
304 sin->sin_len = sizeof(*sin);
305 sin->sin_family = AF_INET;
306 sin->sin_port = IPSEC_PORT_ANY;
307 sin->sin_addr = ip->ip_src;
309 if (saidx->dst.sa.sa_len == 0) {
310 sin = &saidx->dst.sin;
311 sin->sin_len = sizeof(*sin);
312 sin->sin_family = AF_INET;
313 sin->sin_port = IPSEC_PORT_ANY;
314 sin->sin_addr = ip->ip_dst;
317 struct sockaddr_in6 *sin6;
318 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
320 if (saidx->src.sin6.sin6_len == 0) {
321 sin6 = (struct sockaddr_in6 *)&saidx->src;
322 sin6->sin6_len = sizeof(*sin6);
323 sin6->sin6_family = AF_INET6;
324 sin6->sin6_port = IPSEC_PORT_ANY;
325 sin6->sin6_addr = ip6->ip6_src;
326 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
327 /* fix scope id for comparing SPD */
328 sin6->sin6_addr.s6_addr16[1] = 0;
329 sin6->sin6_scope_id =
330 ntohs(ip6->ip6_src.s6_addr16[1]);
333 if (saidx->dst.sin6.sin6_len == 0) {
334 sin6 = (struct sockaddr_in6 *)&saidx->dst;
335 sin6->sin6_len = sizeof(*sin6);
336 sin6->sin6_family = AF_INET6;
337 sin6->sin6_port = IPSEC_PORT_ANY;
338 sin6->sin6_addr = ip6->ip6_dst;
339 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
340 /* fix scope id for comparing SPD */
341 sin6->sin6_addr.s6_addr16[1] = 0;
342 sin6->sin6_scope_id =
343 ntohs(ip6->ip6_dst.s6_addr16[1]);
350 * Lookup SA and validate it.
352 *error = key_checkrequest(isr, saidx);
355 * IPsec processing is required, but no SA found.
356 * I assume that key_acquire() had been called
357 * to get/establish the SA. Here I discard
358 * this packet because it is responsibility for
359 * upper layer to retransmit the packet.
361 IPSECSTAT_INC(ips_out_nosa);
366 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
367 ("no SA found, but required; level %u",
368 ipsec_get_reqlevel(isr)));
369 IPSECREQUEST_UNLOCK(isr);
372 * If isr is NULL, we found a 'use' policy w/o SA.
373 * Return w/o error and w/o isr so we can drop out
374 * and continue w/o IPsec processing.
378 IPSECREQUEST_LOCK(isr);
383 * Check system global policy controls.
385 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
386 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
387 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
388 DPRINTF(("%s: IPsec outbound packet dropped due"
389 " to policy (check your sysctls)\n", __func__));
391 *error = EHOSTUNREACH;
396 * Sanity check the SA contents for the caller
397 * before they invoke the xform output method.
399 if (sav->tdb_xform == NULL) {
400 DPRINTF(("%s: no transform for SA\n", __func__));
401 IPSEC_OSTAT(noxform);
402 *error = EHOSTUNREACH;
407 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
408 IPSECREQUEST_UNLOCK(isr);
415 * IPsec output logic for IPv4.
418 ipsec4_process_packet(
420 struct ipsecrequest *isr,
424 struct secasindex saidx;
425 struct secasvar *sav;
429 IPSEC_ASSERT(m != NULL, ("null mbuf"));
430 IPSEC_ASSERT(isr != NULL, ("null isr"));
432 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
434 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
444 encif->if_opackets++;
445 encif->if_obytes += m->m_pkthdr.len;
447 /* pass the mbuf to enc0 for bpf processing */
448 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
449 /* pass the mbuf to enc0 for packet filtering */
450 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
455 union sockaddr_union *dst = &sav->sah->saidx.dst;
459 * Collect IP_DF state from the outer header.
461 if (dst->sa.sa_family == AF_INET) {
462 if (m->m_len < sizeof (struct ip) &&
463 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
467 ip = mtod(m, struct ip *);
468 /* Honor system-wide control of how to handle IP_DF */
469 switch (V_ip4_ipsec_dfbit) {
470 case 0: /* clear in outer header */
471 case 1: /* set in outer header */
472 setdf = V_ip4_ipsec_dfbit;
474 default: /* propagate to outer header */
475 setdf = ntohs(ip->ip_off & IP_DF);
479 ip = NULL; /* keep compiler happy */
482 /* Do the appropriate encapsulation, if necessary */
483 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
484 dst->sa.sa_family != AF_INET || /* PF mismatch */
486 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
487 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
489 (dst->sa.sa_family == AF_INET && /* Proxy */
490 dst->sin.sin_addr.s_addr != INADDR_ANY &&
491 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
494 /* Fix IPv4 header checksum and length */
495 if (m->m_len < sizeof (struct ip) &&
496 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
500 ip = mtod(m, struct ip *);
501 ip->ip_len = htons(m->m_pkthdr.len);
503 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
505 /* Encapsulate the packet */
506 error = ipip_output(m, isr, &mp, 0, 0);
507 if (mp == NULL && !error) {
508 /* Should never happen. */
509 DPRINTF(("%s: ipip_output returns no mbuf and "
510 "no error!", __func__));
515 /* XXX: Should never happen! */
518 m = NULL; /* ipip_output() already freed it */
523 * ipip_output clears IP_DF in the new header. If
524 * we need to propagate IP_DF from the outer header,
525 * then we have to do it here.
527 * XXX shouldn't assume what ipip_output does.
529 if (dst->sa.sa_family == AF_INET && setdf) {
530 if (m->m_len < sizeof (struct ip) &&
531 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
535 ip = mtod(m, struct ip *);
536 ip->ip_off = ntohs(ip->ip_off);
538 ip->ip_off = htons(ip->ip_off);
544 /* pass the mbuf to enc0 for bpf processing */
545 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER);
546 /* pass the mbuf to enc0 for packet filtering */
547 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
552 * Dispatch to the appropriate IPsec transform logic. The
553 * packet will be returned for transmission after crypto
554 * processing, etc. are completed. For encapsulation we
555 * bypass this call because of the explicit call done above
556 * (necessary to deal with IP_DF handling for IPv4).
558 * NB: m & sav are ``passed to caller'' who's reponsible for
559 * for reclaiming their resources.
561 if (sav->tdb_xform->xf_type != XF_IP4) {
562 ip = mtod(m, struct ip *);
564 off = offsetof(struct ip, ip_p);
565 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
567 error = ipsec_process_done(m, isr);
569 IPSECREQUEST_UNLOCK(isr);
573 IPSECREQUEST_UNLOCK(isr);
582 * Chop IP6 header from the payload.
585 ipsec6_splithdr(struct mbuf *m)
591 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
592 ("first mbuf too short, len %u", m->m_len));
593 ip6 = mtod(m, struct ip6_hdr *);
594 hlen = sizeof(struct ip6_hdr);
595 if (m->m_len > hlen) {
596 MGETHDR(mh, M_NOWAIT, MT_DATA);
601 M_MOVE_PKTHDR(mh, m);
608 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
609 } else if (m->m_len < hlen) {
610 m = m_pullup(m, hlen);
618 * IPsec output logic for IPv6, transport mode.
622 struct ipsec_output_state *state,
625 struct secpolicy *sp,
629 struct ipsecrequest *isr;
630 struct secasindex saidx;
634 IPSEC_ASSERT(state != NULL, ("null state"));
635 IPSEC_ASSERT(state->m != NULL, ("null m"));
636 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
637 IPSEC_ASSERT(mprev != NULL, ("null mprev"));
638 IPSEC_ASSERT(sp != NULL, ("null sp"));
639 IPSEC_ASSERT(tun != NULL, ("null tun"));
641 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
642 printf("%s: applied SP\n", __func__);
643 kdebug_secpolicy(sp));
646 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
647 /* the rest will be handled by ipsec6_output_tunnel() */
648 *tun = 1; /* need tunnel-mode processing */
655 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
656 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
660 /* XXX should notification be done for all errors ? */
662 * Notify the fact that the packet is discarded
663 * to ourselves. I believe this is better than
664 * just silently discarding. (jinmei@kame.net)
665 * XXX: should we restrict the error to TCP packets?
666 * XXX: should we directly notify sockets via
669 icmp6_error(m, ICMP6_DST_UNREACH,
670 ICMP6_DST_UNREACH_ADMIN, 0);
671 m = NULL; /* NB: icmp6_error frees mbuf */
678 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
679 sizeof (struct ip6_hdr),
680 offsetof(struct ip6_hdr,
682 IPSECREQUEST_UNLOCK(isr);
686 IPSECREQUEST_UNLOCK(isr);
694 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
696 struct ip6_hdr *oip6;
700 /* can't tunnel between different AFs */
701 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
702 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
706 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr),
707 ("mbuf wrong size; len %u", m->m_len));
711 * grow the mbuf to accomodate the new IPv6 header.
713 plen = m->m_pkthdr.len;
714 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
716 MGET(n, M_NOWAIT, MT_DATA);
721 n->m_len = sizeof(struct ip6_hdr);
722 n->m_next = m->m_next;
724 m->m_pkthdr.len += sizeof(struct ip6_hdr);
725 oip6 = mtod(n, struct ip6_hdr *);
727 m->m_next->m_len += sizeof(struct ip6_hdr);
728 m->m_next->m_data -= sizeof(struct ip6_hdr);
729 m->m_pkthdr.len += sizeof(struct ip6_hdr);
730 oip6 = mtod(m->m_next, struct ip6_hdr *);
732 ip6 = mtod(m, struct ip6_hdr *);
733 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
735 /* Fake link-local scope-class addresses */
736 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
737 oip6->ip6_src.s6_addr16[1] = 0;
738 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
739 oip6->ip6_dst.s6_addr16[1] = 0;
741 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
742 /* ECN consideration. */
743 ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
744 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
745 ip6->ip6_plen = htons(plen);
747 /* ip6->ip6_plen will be updated in ip6_output() */
749 ip6->ip6_nxt = IPPROTO_IPV6;
750 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr;
751 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr;
752 ip6->ip6_hlim = IPV6_DEFHLIM;
754 /* XXX Should ip6_src be updated later ? */
760 * IPsec output logic for IPv6, tunnel mode.
763 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
766 struct ipsecrequest *isr;
767 struct secasindex saidx;
769 struct sockaddr_in6 *dst6;
772 IPSEC_ASSERT(state != NULL, ("null state"));
773 IPSEC_ASSERT(state->m != NULL, ("null m"));
774 IPSEC_ASSERT(sp != NULL, ("null sp"));
776 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
777 printf("%s: applied SP\n", __func__);
778 kdebug_secpolicy(sp));
782 * transport mode ipsec (before the 1st tunnel mode) is already
783 * processed by ipsec6_output_trans().
785 for (isr = sp->req; isr; isr = isr->next) {
786 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
790 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
791 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
799 encif->if_opackets++;
800 encif->if_obytes += m->m_pkthdr.len;
802 /* pass the mbuf to enc0 for bpf processing */
803 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
804 /* pass the mbuf to enc0 for packet filtering */
805 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
810 * There may be the case that SA status will be changed when
811 * we are refering to one. So calling splsoftnet().
813 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
815 * build IPsec tunnel.
817 /* XXX should be processed with other familiy */
818 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
819 ipseclog((LOG_ERR, "%s: family mismatched between "
820 "inner and outer, spi=%u\n", __func__,
821 ntohl(isr->sav->spi)));
822 IPSEC6STAT_INC(ips_out_inval);
823 error = EAFNOSUPPORT;
827 m = ipsec6_splithdr(m);
829 IPSEC6STAT_INC(ips_out_nomem);
833 error = ipsec6_encapsulate(m, isr->sav);
838 ip6 = mtod(m, struct ip6_hdr *);
841 (struct route *)&isr->sav->sah->route_cache.sin6_route;
842 state->dst = (struct sockaddr *)&state->ro->ro_dst;
843 dst6 = (struct sockaddr_in6 *)state->dst;
845 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
846 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
847 RTFREE(state->ro->ro_rt);
848 state->ro->ro_rt = NULL;
850 if (state->ro->ro_rt == NULL) {
851 bzero(dst6, sizeof(*dst6));
852 dst6->sin6_family = AF_INET6;
853 dst6->sin6_len = sizeof(*dst6);
854 dst6->sin6_addr = ip6->ip6_dst;
855 rtalloc_ign_fib(state->ro, 0UL, M_GETFIB(m));
857 if (state->ro->ro_rt == NULL) {
858 IP6STAT_INC(ip6s_noroute);
859 IPSEC6STAT_INC(ips_out_noroute);
860 error = EHOSTUNREACH;
864 /* adjust state->dst if tunnel endpoint is offlink */
865 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY)
866 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
869 m = ipsec6_splithdr(m);
871 IPSEC6STAT_INC(ips_out_nomem);
875 ip6 = mtod(m, struct ip6_hdr *);
878 /* pass the mbuf to enc0 for bpf processing */
879 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER);
880 /* pass the mbuf to enc0 for packet filtering */
881 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
885 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
886 sizeof (struct ip6_hdr),
887 offsetof(struct ip6_hdr, ip6_nxt));
888 IPSECREQUEST_UNLOCK(isr);
892 IPSECREQUEST_UNLOCK(isr);