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 *);
209 const int hlen = IP_VHL_HL(ip->ip_vhl);
211 const int hlen = (ip->ip_hl << 2);
217 size = sizeof(struct udphdr);
218 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
220 * draft-ietf-ipsec-nat-t-ike-0[01].txt and
221 * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
222 * ignoring possible AH mode
223 * non-IKE marker + non-ESP marker
224 * from draft-ietf-ipsec-udp-encaps-00.txt.
226 size += sizeof(u_int64_t);
228 mi = m_makespace(m, hlen, size, &off);
230 DPRINTF(("%s: m_makespace for udphdr failed\n",
236 udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
237 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
238 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
241 KEY_PORTFROMSADDR(&sav->sah->saidx.src);
242 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
244 udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
245 ip->ip_len = htons(m->m_pkthdr.len);
246 ip->ip_p = IPPROTO_UDP;
248 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
249 *(u_int64_t *)(udp + 1) = 0;
251 #endif /* IPSEC_NAT_T */
253 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
258 * We don't need massage, IPv6 header fields are always in
261 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
264 panic("ipsec_process_done");
270 static struct ipsecrequest *
273 struct ipsecrequest *isr,
275 struct secasindex *saidx,
279 #define IPSEC_OSTAT(name) do { \
280 if (isr->saidx.proto == IPPROTO_ESP) \
281 ESPSTAT_INC(esps_##name); \
282 else if (isr->saidx.proto == IPPROTO_AH)\
283 AHSTAT_INC(ahs_##name); \
285 IPCOMPSTAT_INC(ipcomps_##name); \
287 struct secasvar *sav;
289 IPSECREQUEST_LOCK_ASSERT(isr);
291 IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
292 ("invalid address family %u", af));
295 * Craft SA index to search for proper SA. Note that
296 * we only fillin unspecified SA peers for transport
297 * mode; for tunnel mode they must already be filled in.
300 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
301 /* Fillin unspecified SA peers only for transport mode */
303 struct sockaddr_in *sin;
304 struct ip *ip = mtod(m, struct ip *);
306 if (saidx->src.sa.sa_len == 0) {
307 sin = &saidx->src.sin;
308 sin->sin_len = sizeof(*sin);
309 sin->sin_family = AF_INET;
310 sin->sin_port = IPSEC_PORT_ANY;
311 sin->sin_addr = ip->ip_src;
313 if (saidx->dst.sa.sa_len == 0) {
314 sin = &saidx->dst.sin;
315 sin->sin_len = sizeof(*sin);
316 sin->sin_family = AF_INET;
317 sin->sin_port = IPSEC_PORT_ANY;
318 sin->sin_addr = ip->ip_dst;
321 struct sockaddr_in6 *sin6;
322 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
324 if (saidx->src.sin6.sin6_len == 0) {
325 sin6 = (struct sockaddr_in6 *)&saidx->src;
326 sin6->sin6_len = sizeof(*sin6);
327 sin6->sin6_family = AF_INET6;
328 sin6->sin6_port = IPSEC_PORT_ANY;
329 sin6->sin6_addr = ip6->ip6_src;
330 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
331 /* fix scope id for comparing SPD */
332 sin6->sin6_addr.s6_addr16[1] = 0;
333 sin6->sin6_scope_id =
334 ntohs(ip6->ip6_src.s6_addr16[1]);
337 if (saidx->dst.sin6.sin6_len == 0) {
338 sin6 = (struct sockaddr_in6 *)&saidx->dst;
339 sin6->sin6_len = sizeof(*sin6);
340 sin6->sin6_family = AF_INET6;
341 sin6->sin6_port = IPSEC_PORT_ANY;
342 sin6->sin6_addr = ip6->ip6_dst;
343 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
344 /* fix scope id for comparing SPD */
345 sin6->sin6_addr.s6_addr16[1] = 0;
346 sin6->sin6_scope_id =
347 ntohs(ip6->ip6_dst.s6_addr16[1]);
354 * Lookup SA and validate it.
356 *error = key_checkrequest(isr, saidx);
359 * IPsec processing is required, but no SA found.
360 * I assume that key_acquire() had been called
361 * to get/establish the SA. Here I discard
362 * this packet because it is responsibility for
363 * upper layer to retransmit the packet.
365 IPSECSTAT_INC(ips_out_nosa);
370 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
371 ("no SA found, but required; level %u",
372 ipsec_get_reqlevel(isr)));
373 IPSECREQUEST_UNLOCK(isr);
376 * If isr is NULL, we found a 'use' policy w/o SA.
377 * Return w/o error and w/o isr so we can drop out
378 * and continue w/o IPsec processing.
382 IPSECREQUEST_LOCK(isr);
387 * Check system global policy controls.
389 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
390 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
391 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
392 DPRINTF(("%s: IPsec outbound packet dropped due"
393 " to policy (check your sysctls)\n", __func__));
395 *error = EHOSTUNREACH;
400 * Sanity check the SA contents for the caller
401 * before they invoke the xform output method.
403 if (sav->tdb_xform == NULL) {
404 DPRINTF(("%s: no transform for SA\n", __func__));
405 IPSEC_OSTAT(noxform);
406 *error = EHOSTUNREACH;
411 IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
412 IPSECREQUEST_UNLOCK(isr);
419 * IPsec output logic for IPv4.
422 ipsec4_process_packet(
424 struct ipsecrequest *isr,
428 struct secasindex saidx;
429 struct secasvar *sav;
433 IPSEC_ASSERT(m != NULL, ("null mbuf"));
434 IPSEC_ASSERT(isr != NULL, ("null isr"));
436 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
438 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
448 encif->if_opackets++;
449 encif->if_obytes += m->m_pkthdr.len;
451 /* pass the mbuf to enc0 for bpf processing */
452 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
453 /* pass the mbuf to enc0 for packet filtering */
454 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
459 union sockaddr_union *dst = &sav->sah->saidx.dst;
463 * Collect IP_DF state from the outer header.
465 if (dst->sa.sa_family == AF_INET) {
466 if (m->m_len < sizeof (struct ip) &&
467 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
471 ip = mtod(m, struct ip *);
472 /* Honor system-wide control of how to handle IP_DF */
473 switch (V_ip4_ipsec_dfbit) {
474 case 0: /* clear in outer header */
475 case 1: /* set in outer header */
476 setdf = V_ip4_ipsec_dfbit;
478 default: /* propagate to outer header */
479 setdf = ntohs(ip->ip_off & IP_DF);
483 ip = NULL; /* keep compiler happy */
486 /* Do the appropriate encapsulation, if necessary */
487 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
488 dst->sa.sa_family != AF_INET || /* PF mismatch */
490 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
491 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
493 (dst->sa.sa_family == AF_INET && /* Proxy */
494 dst->sin.sin_addr.s_addr != INADDR_ANY &&
495 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
498 /* Fix IPv4 header checksum and length */
499 if (m->m_len < sizeof (struct ip) &&
500 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
504 ip = mtod(m, struct ip *);
505 ip->ip_len = htons(m->m_pkthdr.len);
508 if (ip->ip_vhl == IP_VHL_BORING)
509 ip->ip_sum = in_cksum_hdr(ip);
511 ip->ip_sum = in_cksum(m,
512 _IP_VHL_HL(ip->ip_vhl) << 2);
514 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
517 /* Encapsulate the packet */
518 error = ipip_output(m, isr, &mp, 0, 0);
519 if (mp == NULL && !error) {
520 /* Should never happen. */
521 DPRINTF(("%s: ipip_output returns no mbuf and "
522 "no error!", __func__));
527 /* XXX: Should never happen! */
530 m = NULL; /* ipip_output() already freed it */
535 * ipip_output clears IP_DF in the new header. If
536 * we need to propagate IP_DF from the outer header,
537 * then we have to do it here.
539 * XXX shouldn't assume what ipip_output does.
541 if (dst->sa.sa_family == AF_INET && setdf) {
542 if (m->m_len < sizeof (struct ip) &&
543 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
547 ip = mtod(m, struct ip *);
548 ip->ip_off = ntohs(ip->ip_off);
550 ip->ip_off = htons(ip->ip_off);
556 /* pass the mbuf to enc0 for bpf processing */
557 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER);
558 /* pass the mbuf to enc0 for packet filtering */
559 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
564 * Dispatch to the appropriate IPsec transform logic. The
565 * packet will be returned for transmission after crypto
566 * processing, etc. are completed. For encapsulation we
567 * bypass this call because of the explicit call done above
568 * (necessary to deal with IP_DF handling for IPv4).
570 * NB: m & sav are ``passed to caller'' who's reponsible for
571 * for reclaiming their resources.
573 if (sav->tdb_xform->xf_type != XF_IP4) {
574 ip = mtod(m, struct ip *);
576 off = offsetof(struct ip, ip_p);
577 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
579 error = ipsec_process_done(m, isr);
581 IPSECREQUEST_UNLOCK(isr);
585 IPSECREQUEST_UNLOCK(isr);
594 * Chop IP6 header from the payload.
597 ipsec6_splithdr(struct mbuf *m)
603 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
604 ("first mbuf too short, len %u", m->m_len));
605 ip6 = mtod(m, struct ip6_hdr *);
606 hlen = sizeof(struct ip6_hdr);
607 if (m->m_len > hlen) {
608 MGETHDR(mh, M_NOWAIT, MT_DATA);
613 M_MOVE_PKTHDR(mh, m);
620 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
621 } else if (m->m_len < hlen) {
622 m = m_pullup(m, hlen);
630 * IPsec output logic for IPv6, transport mode.
634 struct ipsec_output_state *state,
637 struct secpolicy *sp,
641 struct ipsecrequest *isr;
642 struct secasindex saidx;
646 IPSEC_ASSERT(state != NULL, ("null state"));
647 IPSEC_ASSERT(state->m != NULL, ("null m"));
648 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
649 IPSEC_ASSERT(mprev != NULL, ("null mprev"));
650 IPSEC_ASSERT(sp != NULL, ("null sp"));
651 IPSEC_ASSERT(tun != NULL, ("null tun"));
653 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
654 printf("%s: applied SP\n", __func__);
655 kdebug_secpolicy(sp));
658 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
659 /* the rest will be handled by ipsec6_output_tunnel() */
660 *tun = 1; /* need tunnel-mode processing */
667 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
668 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
672 /* XXX should notification be done for all errors ? */
674 * Notify the fact that the packet is discarded
675 * to ourselves. I believe this is better than
676 * just silently discarding. (jinmei@kame.net)
677 * XXX: should we restrict the error to TCP packets?
678 * XXX: should we directly notify sockets via
681 icmp6_error(m, ICMP6_DST_UNREACH,
682 ICMP6_DST_UNREACH_ADMIN, 0);
683 m = NULL; /* NB: icmp6_error frees mbuf */
690 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
691 sizeof (struct ip6_hdr),
692 offsetof(struct ip6_hdr,
694 IPSECREQUEST_UNLOCK(isr);
698 IPSECREQUEST_UNLOCK(isr);
706 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
708 struct ip6_hdr *oip6;
712 /* can't tunnel between different AFs */
713 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
714 sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
718 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr),
719 ("mbuf wrong size; len %u", m->m_len));
723 * grow the mbuf to accomodate the new IPv6 header.
725 plen = m->m_pkthdr.len;
726 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
728 MGET(n, M_NOWAIT, MT_DATA);
733 n->m_len = sizeof(struct ip6_hdr);
734 n->m_next = m->m_next;
736 m->m_pkthdr.len += sizeof(struct ip6_hdr);
737 oip6 = mtod(n, struct ip6_hdr *);
739 m->m_next->m_len += sizeof(struct ip6_hdr);
740 m->m_next->m_data -= sizeof(struct ip6_hdr);
741 m->m_pkthdr.len += sizeof(struct ip6_hdr);
742 oip6 = mtod(m->m_next, struct ip6_hdr *);
744 ip6 = mtod(m, struct ip6_hdr *);
745 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
747 /* Fake link-local scope-class addresses */
748 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
749 oip6->ip6_src.s6_addr16[1] = 0;
750 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
751 oip6->ip6_dst.s6_addr16[1] = 0;
753 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */
754 /* ECN consideration. */
755 ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
756 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
757 ip6->ip6_plen = htons(plen);
759 /* ip6->ip6_plen will be updated in ip6_output() */
761 ip6->ip6_nxt = IPPROTO_IPV6;
762 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr;
763 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr;
764 ip6->ip6_hlim = IPV6_DEFHLIM;
766 /* XXX Should ip6_src be updated later ? */
772 * IPsec output logic for IPv6, tunnel mode.
775 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
778 struct ipsecrequest *isr;
779 struct secasindex saidx;
781 struct sockaddr_in6 *dst6;
784 IPSEC_ASSERT(state != NULL, ("null state"));
785 IPSEC_ASSERT(state->m != NULL, ("null m"));
786 IPSEC_ASSERT(sp != NULL, ("null sp"));
788 KEYDEBUG(KEYDEBUG_IPSEC_DATA,
789 printf("%s: applied SP\n", __func__);
790 kdebug_secpolicy(sp));
794 * transport mode ipsec (before the 1st tunnel mode) is already
795 * processed by ipsec6_output_trans().
797 for (isr = sp->req; isr; isr = isr->next) {
798 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
802 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
803 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
811 encif->if_opackets++;
812 encif->if_obytes += m->m_pkthdr.len;
814 /* pass the mbuf to enc0 for bpf processing */
815 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
816 /* pass the mbuf to enc0 for packet filtering */
817 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
822 * There may be the case that SA status will be changed when
823 * we are refering to one. So calling splsoftnet().
825 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
827 * build IPsec tunnel.
829 /* XXX should be processed with other familiy */
830 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
831 ipseclog((LOG_ERR, "%s: family mismatched between "
832 "inner and outer, spi=%u\n", __func__,
833 ntohl(isr->sav->spi)));
834 IPSEC6STAT_INC(ips_out_inval);
835 error = EAFNOSUPPORT;
839 m = ipsec6_splithdr(m);
841 IPSEC6STAT_INC(ips_out_nomem);
845 error = ipsec6_encapsulate(m, isr->sav);
850 ip6 = mtod(m, struct ip6_hdr *);
853 (struct route *)&isr->sav->sah->route_cache.sin6_route;
854 state->dst = (struct sockaddr *)&state->ro->ro_dst;
855 dst6 = (struct sockaddr_in6 *)state->dst;
857 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
858 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
859 RTFREE(state->ro->ro_rt);
860 state->ro->ro_rt = NULL;
862 if (state->ro->ro_rt == NULL) {
863 bzero(dst6, sizeof(*dst6));
864 dst6->sin6_family = AF_INET6;
865 dst6->sin6_len = sizeof(*dst6);
866 dst6->sin6_addr = ip6->ip6_dst;
867 rtalloc_ign_fib(state->ro, 0UL, M_GETFIB(m));
869 if (state->ro->ro_rt == NULL) {
870 IP6STAT_INC(ip6s_noroute);
871 IPSEC6STAT_INC(ips_out_noroute);
872 error = EHOSTUNREACH;
876 /* adjust state->dst if tunnel endpoint is offlink */
877 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY)
878 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
881 m = ipsec6_splithdr(m);
883 IPSEC6STAT_INC(ips_out_nomem);
887 ip6 = mtod(m, struct ip6_hdr *);
890 /* pass the mbuf to enc0 for bpf processing */
891 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER);
892 /* pass the mbuf to enc0 for packet filtering */
893 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
897 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
898 sizeof (struct ip6_hdr),
899 offsetof(struct ip6_hdr, ip6_nxt));
900 IPSECREQUEST_UNLOCK(isr);
904 IPSECREQUEST_UNLOCK(isr);