freebsd-dev/sys/netipsec/ipsec_output.c
Bjoern A. Zeeb 19ad9831df Add sysctls to if_enc(4) to control whether the firewalls or
bpf will see inner and outer headers or just inner or outer
headers for incoming and outgoing IPsec packets.

This is useful in bpf to not have over long lines for debugging
or selcting packets based on the inner headers.
It also properly defines the behavior of what the firewalls see.

Last but not least it gives you if_enc(4) for IPv6 as well.

[ As some auxiliary state was not available in the later
  input path we save it in the tdbi. That way tcpdump can give a
  consistent view of either of (authentic,confidential) for both
  before and after states. ]

Discussed with:	thompsa (2007-04-25, basic idea of unifying paths)
Reviewed by:	thompsa, gnn
2007-11-28 22:33:53 +00:00

817 lines
21 KiB
C

/*-
* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* IPsec output processing.
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_enc.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/pfil.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_var.h>
#include <netinet/ip_ecn.h>
#ifdef INET6
#include <netinet6/ip6_ecn.h>
#endif
#include <netinet/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet/icmp6.h>
#endif
#include <netipsec/ipsec.h>
#ifdef INET6
#include <netipsec/ipsec6.h>
#endif
#include <netipsec/ah_var.h>
#include <netipsec/esp_var.h>
#include <netipsec/ipcomp_var.h>
#include <netipsec/xform.h>
#include <netipsec/key.h>
#include <netipsec/keydb.h>
#include <netipsec/key_debug.h>
#include <machine/in_cksum.h>
int
ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
{
struct tdb_ident *tdbi;
struct m_tag *mtag;
struct secasvar *sav;
struct secasindex *saidx;
int error;
IPSEC_SPLASSERT_SOFTNET(__func__);
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(isr != NULL, ("null ISR"));
sav = isr->sav;
IPSEC_ASSERT(sav != NULL, ("null SA"));
IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
saidx = &sav->sah->saidx;
switch (saidx->dst.sa.sa_family) {
#ifdef INET
case AF_INET:
/* Fix the header length, for AH processing. */
mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
/* Fix the header length, for AH processing. */
if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
error = ENXIO;
goto bad;
}
if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
/* No jumbogram support. */
error = ENXIO; /*?*/
goto bad;
}
mtod(m, struct ip6_hdr *)->ip6_plen =
htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
break;
#endif /* INET6 */
default:
DPRINTF(("%s: unknown protocol family %u\n", __func__,
saidx->dst.sa.sa_family));
error = ENXIO;
goto bad;
}
/*
* Add a record of what we've done or what needs to be done to the
* packet.
*/
mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
sizeof(struct tdb_ident), M_NOWAIT);
if (mtag == NULL) {
DPRINTF(("%s: could not get packet tag\n", __func__));
error = ENOMEM;
goto bad;
}
tdbi = (struct tdb_ident *)(mtag + 1);
tdbi->dst = saidx->dst;
tdbi->proto = saidx->proto;
tdbi->spi = sav->spi;
m_tag_prepend(m, mtag);
/*
* If there's another (bundled) SA to apply, do so.
* Note that this puts a burden on the kernel stack size.
* If this is a problem we'll need to introduce a queue
* to set the packet on so we can unwind the stack before
* doing further processing.
*/
if (isr->next) {
ipsec4stat.ips_out_bundlesa++;
return ipsec4_process_packet(m, isr->next, 0, 0);
}
key_sa_recordxfer(sav, m); /* record data transfer */
/*
* We're done with IPsec processing, transmit the packet using the
* appropriate network protocol (IP or IPv6). SPD lookup will be
* performed again there.
*/
switch (saidx->dst.sa.sa_family) {
#ifdef INET
struct ip *ip;
case AF_INET:
ip = mtod(m, struct ip *);
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
#endif /* INET */
#ifdef INET6
case AF_INET6:
/*
* We don't need massage, IPv6 header fields are always in
* net endian.
*/
return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
#endif /* INET6 */
}
panic("ipsec_process_done");
bad:
m_freem(m);
KEY_FREESAV(&sav);
return (error);
}
static struct ipsecrequest *
ipsec_nextisr(
struct mbuf *m,
struct ipsecrequest *isr,
int af,
struct secasindex *saidx,
int *error
)
{
#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \
isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++)
struct secasvar *sav;
IPSEC_SPLASSERT_SOFTNET(__func__);
IPSECREQUEST_LOCK_ASSERT(isr);
IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
("invalid address family %u", af));
again:
/*
* Craft SA index to search for proper SA. Note that
* we only fillin unspecified SA peers for transport
* mode; for tunnel mode they must already be filled in.
*/
*saidx = isr->saidx;
if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
/* Fillin unspecified SA peers only for transport mode */
if (af == AF_INET) {
struct sockaddr_in *sin;
struct ip *ip = mtod(m, struct ip *);
if (saidx->src.sa.sa_len == 0) {
sin = &saidx->src.sin;
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_port = IPSEC_PORT_ANY;
sin->sin_addr = ip->ip_src;
}
if (saidx->dst.sa.sa_len == 0) {
sin = &saidx->dst.sin;
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_port = IPSEC_PORT_ANY;
sin->sin_addr = ip->ip_dst;
}
} else {
struct sockaddr_in6 *sin6;
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
if (saidx->src.sin6.sin6_len == 0) {
sin6 = (struct sockaddr_in6 *)&saidx->src;
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = IPSEC_PORT_ANY;
sin6->sin6_addr = ip6->ip6_src;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
/* fix scope id for comparing SPD */
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id =
ntohs(ip6->ip6_src.s6_addr16[1]);
}
}
if (saidx->dst.sin6.sin6_len == 0) {
sin6 = (struct sockaddr_in6 *)&saidx->dst;
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = IPSEC_PORT_ANY;
sin6->sin6_addr = ip6->ip6_dst;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
/* fix scope id for comparing SPD */
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id =
ntohs(ip6->ip6_dst.s6_addr16[1]);
}
}
}
}
/*
* Lookup SA and validate it.
*/
*error = key_checkrequest(isr, saidx);
if (*error != 0) {
/*
* IPsec processing is required, but no SA found.
* I assume that key_acquire() had been called
* to get/establish the SA. Here I discard
* this packet because it is responsibility for
* upper layer to retransmit the packet.
*/
ipsec4stat.ips_out_nosa++;
goto bad;
}
sav = isr->sav;
if (sav == NULL) { /* XXX valid return */
IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
("no SA found, but required; level %u",
ipsec_get_reqlevel(isr)));
IPSECREQUEST_UNLOCK(isr);
isr = isr->next;
if (isr == NULL) {
/*XXXstatistic??*/
*error = EINVAL; /*XXX*/
return isr;
}
IPSECREQUEST_LOCK(isr);
goto again;
}
/*
* Check system global policy controls.
*/
if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) ||
(isr->saidx.proto == IPPROTO_AH && !ah_enable) ||
(isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) {
DPRINTF(("%s: IPsec outbound packet dropped due"
" to policy (check your sysctls)\n", __func__));
IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops,
ipcompstat.ipcomps_pdrops);
*error = EHOSTUNREACH;
goto bad;
}
/*
* Sanity check the SA contents for the caller
* before they invoke the xform output method.
*/
if (sav->tdb_xform == NULL) {
DPRINTF(("%s: no transform for SA\n", __func__));
IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform,
ipcompstat.ipcomps_noxform);
*error = EHOSTUNREACH;
goto bad;
}
return isr;
bad:
IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
IPSECREQUEST_UNLOCK(isr);
return NULL;
#undef IPSEC_OSTAT
}
#ifdef INET
/*
* IPsec output logic for IPv4.
*/
int
ipsec4_process_packet(
struct mbuf *m,
struct ipsecrequest *isr,
int flags,
int tunalready)
{
struct secasindex saidx;
struct secasvar *sav;
struct ip *ip;
int error, i, off;
IPSEC_ASSERT(m != NULL, ("null mbuf"));
IPSEC_ASSERT(isr != NULL, ("null isr"));
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
if (isr == NULL)
goto bad;
sav = isr->sav;
#ifdef DEV_ENC
/* pass the mbuf to enc0 for bpf processing */
ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
/* pass the mbuf to enc0 for packet filtering */
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
goto bad;
#endif
if (!tunalready) {
union sockaddr_union *dst = &sav->sah->saidx.dst;
int setdf;
/*
* Collect IP_DF state from the outer header.
*/
if (dst->sa.sa_family == AF_INET) {
if (m->m_len < sizeof (struct ip) &&
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
error = ENOBUFS;
goto bad;
}
ip = mtod(m, struct ip *);
/* Honor system-wide control of how to handle IP_DF */
switch (ip4_ipsec_dfbit) {
case 0: /* clear in outer header */
case 1: /* set in outer header */
setdf = ip4_ipsec_dfbit;
break;
default: /* propagate to outer header */
setdf = ntohs(ip->ip_off & IP_DF);
break;
}
} else {
ip = NULL; /* keep compiler happy */
setdf = 0;
}
/* Do the appropriate encapsulation, if necessary */
if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
dst->sa.sa_family != AF_INET || /* PF mismatch */
#if 0
(sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
sav->tdb_xform->xf_type == XF_IP4 || /* ditto */
#endif
(dst->sa.sa_family == AF_INET && /* Proxy */
dst->sin.sin_addr.s_addr != INADDR_ANY &&
dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
struct mbuf *mp;
/* Fix IPv4 header checksum and length */
if (m->m_len < sizeof (struct ip) &&
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
error = ENOBUFS;
goto bad;
}
ip = mtod(m, struct ip *);
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_sum = 0;
#ifdef _IP_VHL
if (ip->ip_vhl == IP_VHL_BORING)
ip->ip_sum = in_cksum_hdr(ip);
else
ip->ip_sum = in_cksum(m,
_IP_VHL_HL(ip->ip_vhl) << 2);
#else
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
#endif
/* Encapsulate the packet */
error = ipip_output(m, isr, &mp, 0, 0);
if (mp == NULL && !error) {
/* Should never happen. */
DPRINTF(("%s: ipip_output returns no mbuf and "
"no error!", __func__));
error = EFAULT;
}
if (error) {
if (mp) {
/* XXX: Should never happen! */
m_freem(mp);
}
m = NULL; /* ipip_output() already freed it */
goto bad;
}
m = mp, mp = NULL;
/*
* ipip_output clears IP_DF in the new header. If
* we need to propagate IP_DF from the outer header,
* then we have to do it here.
*
* XXX shouldn't assume what ipip_output does.
*/
if (dst->sa.sa_family == AF_INET && setdf) {
if (m->m_len < sizeof (struct ip) &&
(m = m_pullup(m, sizeof (struct ip))) == NULL) {
error = ENOBUFS;
goto bad;
}
ip = mtod(m, struct ip *);
ip->ip_off = ntohs(ip->ip_off);
ip->ip_off |= IP_DF;
ip->ip_off = htons(ip->ip_off);
}
}
}
#ifdef DEV_ENC
/* pass the mbuf to enc0 for bpf processing */
ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER);
/* pass the mbuf to enc0 for packet filtering */
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
goto bad;
#endif
/*
* Dispatch to the appropriate IPsec transform logic. The
* packet will be returned for transmission after crypto
* processing, etc. are completed. For encapsulation we
* bypass this call because of the explicit call done above
* (necessary to deal with IP_DF handling for IPv4).
*
* NB: m & sav are ``passed to caller'' who's reponsible for
* for reclaiming their resources.
*/
if (sav->tdb_xform->xf_type != XF_IP4) {
ip = mtod(m, struct ip *);
i = ip->ip_hl << 2;
off = offsetof(struct ip, ip_p);
error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
} else {
error = ipsec_process_done(m, isr);
}
IPSECREQUEST_UNLOCK(isr);
return error;
bad:
if (isr)
IPSECREQUEST_UNLOCK(isr);
if (m)
m_freem(m);
return error;
}
#endif
#ifdef INET6
/*
* Chop IP6 header from the payload.
*/
static struct mbuf *
ipsec6_splithdr(struct mbuf *m)
{
struct mbuf *mh;
struct ip6_hdr *ip6;
int hlen;
IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr),
("first mbuf too short, len %u", m->m_len));
ip6 = mtod(m, struct ip6_hdr *);
hlen = sizeof(struct ip6_hdr);
if (m->m_len > hlen) {
MGETHDR(mh, M_DONTWAIT, MT_DATA);
if (!mh) {
m_freem(m);
return NULL;
}
M_MOVE_PKTHDR(mh, m);
MH_ALIGN(mh, hlen);
m->m_len -= hlen;
m->m_data += hlen;
mh->m_next = m;
m = mh;
m->m_len = hlen;
bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen);
} else if (m->m_len < hlen) {
m = m_pullup(m, hlen);
if (!m)
return NULL;
}
return m;
}
/*
* IPsec output logic for IPv6, transport mode.
*/
int
ipsec6_output_trans(
struct ipsec_output_state *state,
u_char *nexthdrp,
struct mbuf *mprev,
struct secpolicy *sp,
int flags,
int *tun)
{
struct ipsecrequest *isr;
struct secasindex saidx;
int error = 0;
struct mbuf *m;
IPSEC_ASSERT(state != NULL, ("null state"));
IPSEC_ASSERT(state->m != NULL, ("null m"));
IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp"));
IPSEC_ASSERT(mprev != NULL, ("null mprev"));
IPSEC_ASSERT(sp != NULL, ("null sp"));
IPSEC_ASSERT(tun != NULL, ("null tun"));
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("%s: applied SP\n", __func__);
kdebug_secpolicy(sp));
isr = sp->req;
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
/* the rest will be handled by ipsec6_output_tunnel() */
*tun = 1; /* need tunnel-mode processing */
return 0;
}
*tun = 0;
m = state->m;
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
if (isr == NULL) {
#ifdef notdef
/* XXX should notification be done for all errors ? */
/*
* Notify the fact that the packet is discarded
* to ourselves. I believe this is better than
* just silently discarding. (jinmei@kame.net)
* XXX: should we restrict the error to TCP packets?
* XXX: should we directly notify sockets via
* pfctlinputs?
*/
icmp6_error(m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADMIN, 0);
m = NULL; /* NB: icmp6_error frees mbuf */
#endif
goto bad;
}
error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
sizeof (struct ip6_hdr),
offsetof(struct ip6_hdr,
ip6_nxt));
IPSECREQUEST_UNLOCK(isr);
return error;
bad:
if (isr)
IPSECREQUEST_UNLOCK(isr);
if (m)
m_freem(m);
state->m = NULL;
return error;
}
static int
ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav)
{
struct ip6_hdr *oip6;
struct ip6_hdr *ip6;
size_t plen;
/* can't tunnel between different AFs */
if (sav->sah->saidx.src.sa.sa_family != AF_INET6 ||
sav->sah->saidx.dst.sa.sa_family != AF_INET6) {
m_freem(m);
return EINVAL;
}
IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr),
("mbuf wrong size; len %u", m->m_len));
/*
* grow the mbuf to accomodate the new IPv6 header.
*/
plen = m->m_pkthdr.len;
if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) {
struct mbuf *n;
MGET(n, M_DONTWAIT, MT_DATA);
if (!n) {
m_freem(m);
return ENOBUFS;
}
n->m_len = sizeof(struct ip6_hdr);
n->m_next = m->m_next;
m->m_next = n;
m->m_pkthdr.len += sizeof(struct ip6_hdr);
oip6 = mtod(n, struct ip6_hdr *);
} else {
m->m_next->m_len += sizeof(struct ip6_hdr);
m->m_next->m_data -= sizeof(struct ip6_hdr);
m->m_pkthdr.len += sizeof(struct ip6_hdr);
oip6 = mtod(m->m_next, struct ip6_hdr *);
}
ip6 = mtod(m, struct ip6_hdr *);
bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr));
/* Fake link-local scope-class addresses */
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
oip6->ip6_src.s6_addr16[1] = 0;
if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
oip6->ip6_dst.s6_addr16[1] = 0;
/* construct new IPv6 header. see RFC 2401 5.1.2.2 */
/* ECN consideration. */
ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow);
if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr))
ip6->ip6_plen = htons(plen);
else {
/* ip6->ip6_plen will be updated in ip6_output() */
}
ip6->ip6_nxt = IPPROTO_IPV6;
ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr;
ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr;
ip6->ip6_hlim = IPV6_DEFHLIM;
/* XXX Should ip6_src be updated later ? */
return 0;
}
/*
* IPsec output logic for IPv6, tunnel mode.
*/
int
ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags)
{
struct ip6_hdr *ip6;
struct ipsecrequest *isr;
struct secasindex saidx;
int error;
struct sockaddr_in6* dst6;
struct mbuf *m;
IPSEC_ASSERT(state != NULL, ("null state"));
IPSEC_ASSERT(state->m != NULL, ("null m"));
IPSEC_ASSERT(sp != NULL, ("null sp"));
KEYDEBUG(KEYDEBUG_IPSEC_DATA,
printf("%s: applied SP\n", __func__);
kdebug_secpolicy(sp));
m = state->m;
/*
* transport mode ipsec (before the 1st tunnel mode) is already
* processed by ipsec6_output_trans().
*/
for (isr = sp->req; isr; isr = isr->next) {
if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
break;
}
IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */
isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
if (isr == NULL)
goto bad;
#ifdef DEV_ENC
/* pass the mbuf to enc0 for bpf processing */
ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
/* pass the mbuf to enc0 for packet filtering */
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
goto bad;
#endif
/*
* There may be the case that SA status will be changed when
* we are refering to one. So calling splsoftnet().
*/
if (isr->saidx.mode == IPSEC_MODE_TUNNEL) {
/*
* build IPsec tunnel.
*/
/* XXX should be processed with other familiy */
if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) {
ipseclog((LOG_ERR, "%s: family mismatched between "
"inner and outer, spi=%u\n", __func__,
ntohl(isr->sav->spi)));
ipsec6stat.ips_out_inval++;
error = EAFNOSUPPORT;
goto bad;
}
m = ipsec6_splithdr(m);
if (!m) {
ipsec6stat.ips_out_nomem++;
error = ENOMEM;
goto bad;
}
error = ipsec6_encapsulate(m, isr->sav);
if (error) {
m = NULL;
goto bad;
}
ip6 = mtod(m, struct ip6_hdr *);
state->ro = &isr->sav->sah->sa_route;
state->dst = (struct sockaddr *)&state->ro->ro_dst;
dst6 = (struct sockaddr_in6 *)state->dst;
if (state->ro->ro_rt
&& ((state->ro->ro_rt->rt_flags & RTF_UP) == 0
|| !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) {
RTFREE(state->ro->ro_rt);
state->ro->ro_rt = NULL;
}
if (state->ro->ro_rt == 0) {
bzero(dst6, sizeof(*dst6));
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = ip6->ip6_dst;
rtalloc(state->ro);
}
if (state->ro->ro_rt == 0) {
ip6stat.ip6s_noroute++;
ipsec6stat.ips_out_noroute++;
error = EHOSTUNREACH;
goto bad;
}
/* adjust state->dst if tunnel endpoint is offlink */
if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) {
state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway;
dst6 = (struct sockaddr_in6 *)state->dst;
}
}
m = ipsec6_splithdr(m);
if (!m) {
ipsec6stat.ips_out_nomem++;
error = ENOMEM;
goto bad;
}
ip6 = mtod(m, struct ip6_hdr *);
#ifdef DEV_ENC
/* pass the mbuf to enc0 for bpf processing */
ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER);
/* pass the mbuf to enc0 for packet filtering */
if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
goto bad;
#endif
error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL,
sizeof (struct ip6_hdr),
offsetof(struct ip6_hdr, ip6_nxt));
IPSECREQUEST_UNLOCK(isr);
return error;
bad:
if (isr)
IPSECREQUEST_UNLOCK(isr);
if (m)
m_freem(m);
state->m = NULL;
return error;
}
#endif /*INET6*/