605 lines
15 KiB
C
605 lines
15 KiB
C
/* $NetBSD: ipsec_input.c,v 1.79 2023/01/27 09:33:43 ozaki-r Exp $ */
|
|
/* $FreeBSD: ipsec_input.c,v 1.2.4.2 2003/03/28 20:32:53 sam Exp $ */
|
|
/* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */
|
|
|
|
/*
|
|
* The authors of this code are John Ioannidis (ji@tla.org),
|
|
* Angelos D. Keromytis (kermit@csd.uch.gr) and
|
|
* Niels Provos (provos@physnet.uni-hamburg.de).
|
|
*
|
|
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
|
|
* in November 1995.
|
|
*
|
|
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
|
|
* by Angelos D. Keromytis.
|
|
*
|
|
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
|
|
* and Niels Provos.
|
|
*
|
|
* Additional features in 1999 by Angelos D. Keromytis.
|
|
*
|
|
* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
|
|
* Angelos D. Keromytis and Niels Provos.
|
|
* Copyright (c) 2001, Angelos D. Keromytis.
|
|
*
|
|
* Permission to use, copy, and modify this software with or without fee
|
|
* is hereby granted, provided that this entire notice is included in
|
|
* all copies of any software which is or includes a copy or
|
|
* modification of this software.
|
|
* You may use this code under the GNU public license if you so wish. Please
|
|
* contribute changes back to the authors under this freer than GPL license
|
|
* so that we may further the use of strong encryption without limitations to
|
|
* all.
|
|
*
|
|
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
|
|
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
|
|
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
|
|
* PURPOSE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: ipsec_input.c,v 1.79 2023/01/27 09:33:43 ozaki-r Exp $");
|
|
|
|
/*
|
|
* IPsec input processing.
|
|
*/
|
|
|
|
#if defined(_KERNEL_OPT)
|
|
#include "opt_inet.h"
|
|
#endif
|
|
|
|
#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/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/in_proto.h>
|
|
#include <netinet/udp.h>
|
|
#include <netinet/tcp.h>
|
|
|
|
#include <netinet/ip6.h>
|
|
#ifdef INET6
|
|
#include <netinet6/in6.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/ip6_private.h>
|
|
#include <netinet6/scope6_var.h>
|
|
#endif
|
|
#include <netinet/in_pcb.h>
|
|
|
|
#include <netipsec/ipsec.h>
|
|
#include <netipsec/ipsec_private.h>
|
|
#ifdef INET6
|
|
#include <netipsec/ipsec6.h>
|
|
#endif
|
|
#include <netipsec/ah_var.h>
|
|
#include <netipsec/esp.h>
|
|
#include <netipsec/esp_var.h>
|
|
#include <netipsec/ipcomp_var.h>
|
|
|
|
#include <netipsec/key.h>
|
|
#include <netipsec/keydb.h>
|
|
|
|
#include <netipsec/xform.h>
|
|
#include <netinet6/ip6protosw.h>
|
|
|
|
#define IPSEC_ISTAT(p, x, y, z) \
|
|
do { \
|
|
switch (p) { \
|
|
case IPPROTO_ESP: \
|
|
ESP_STATINC(x); \
|
|
break; \
|
|
case IPPROTO_AH: \
|
|
AH_STATINC(y); \
|
|
break; \
|
|
default: \
|
|
IPCOMP_STATINC(z); \
|
|
break; \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
/*
|
|
* fixup TCP/UDP checksum
|
|
*
|
|
* XXX: if we have NAT-OA payload from IKE server,
|
|
* we must do the differential update of checksum.
|
|
*
|
|
* XXX: NAT-OAi/NAT-OAr derived from IKE initiator/responder.
|
|
* how to know the IKE side from kernel?
|
|
*/
|
|
static struct mbuf *
|
|
ipsec4_fixup_checksum(struct mbuf *m)
|
|
{
|
|
struct ip *ip;
|
|
struct tcphdr *th;
|
|
struct udphdr *uh;
|
|
int poff, off;
|
|
int plen;
|
|
|
|
if (m->m_len < sizeof(*ip)) {
|
|
m = m_pullup(m, sizeof(*ip));
|
|
if (m == NULL)
|
|
return NULL;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
poff = ip->ip_hl << 2;
|
|
plen = ntohs(ip->ip_len) - poff;
|
|
|
|
switch (ip->ip_p) {
|
|
case IPPROTO_TCP:
|
|
M_REGION_GET(th, struct tcphdr *, m, poff, sizeof(*th));
|
|
if (th == NULL)
|
|
return NULL;
|
|
off = th->th_off << 2;
|
|
if (off < sizeof(*th) || off > plen) {
|
|
m_freem(m);
|
|
return NULL;
|
|
}
|
|
th->th_sum = 0;
|
|
th->th_sum = in4_cksum(m, IPPROTO_TCP, poff, plen);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
M_REGION_GET(uh, struct udphdr *, m, poff, sizeof(*uh));
|
|
if (uh == NULL)
|
|
return NULL;
|
|
off = sizeof(*uh);
|
|
if (off > plen) {
|
|
m_freem(m);
|
|
return NULL;
|
|
}
|
|
uh->uh_sum = 0;
|
|
uh->uh_sum = in4_cksum(m, IPPROTO_UDP, poff, plen);
|
|
break;
|
|
default:
|
|
/* no checksum */
|
|
return m;
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
static void
|
|
nat_t_ports_get(struct mbuf *m, uint16_t *dport, uint16_t *sport)
|
|
{
|
|
struct m_tag *tag;
|
|
|
|
if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS))) {
|
|
*sport = ((uint16_t *)(tag + 1))[0];
|
|
*dport = ((uint16_t *)(tag + 1))[1];
|
|
} else
|
|
*sport = *dport = 0;
|
|
}
|
|
|
|
static uint32_t
|
|
spi_get(struct mbuf *m, int sproto, int skip)
|
|
{
|
|
uint32_t spi;
|
|
uint16_t cpi;
|
|
|
|
switch (sproto) {
|
|
case IPPROTO_ESP:
|
|
m_copydata(m, skip, sizeof(spi), &spi);
|
|
return spi;
|
|
case IPPROTO_AH:
|
|
m_copydata(m, skip + sizeof(spi), sizeof(spi), &spi);
|
|
return spi;
|
|
case IPPROTO_IPCOMP:
|
|
m_copydata(m, skip + sizeof(cpi), sizeof(cpi), &cpi);
|
|
return htonl(ntohs(cpi));
|
|
default:
|
|
panic("%s called with bad protocol number: %d\n", __func__,
|
|
sproto);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* ipsec_common_input gets called when an IPsec-protected packet
|
|
* is received by IPv4 or IPv6. Its job is to find the right SA
|
|
* and call the appropriate transform. The transform callback
|
|
* takes care of further processing (like ingress filtering).
|
|
*/
|
|
static int
|
|
ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
|
|
{
|
|
char buf[IPSEC_ADDRSTRLEN], buf2[IPSEC_ADDRSTRLEN];
|
|
union sockaddr_union src_address, dst_address;
|
|
struct secasvar *sav;
|
|
u_int32_t spi;
|
|
u_int16_t sport;
|
|
u_int16_t dport;
|
|
int error;
|
|
|
|
IPSEC_ISTAT(sproto, ESP_STAT_INPUT, AH_STAT_INPUT,
|
|
IPCOMP_STAT_INPUT);
|
|
|
|
KASSERT(m != NULL);
|
|
|
|
if ((sproto == IPPROTO_ESP && !esp_enable) ||
|
|
(sproto == IPPROTO_AH && !ah_enable) ||
|
|
(sproto == IPPROTO_IPCOMP && !ipcomp_enable)) {
|
|
m_freem(m);
|
|
IPSEC_ISTAT(sproto, ESP_STAT_PDROPS, AH_STAT_PDROPS,
|
|
IPCOMP_STAT_PDROPS);
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
if (m->m_pkthdr.len - skip < 2 * sizeof(u_int32_t)) {
|
|
m_freem(m);
|
|
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
IPSECLOG(LOG_DEBUG, "packet too small\n");
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Retrieve the SPI from the relevant IPsec header */
|
|
spi = spi_get(m, sproto, skip);
|
|
|
|
/* find the source port for NAT-T */
|
|
nat_t_ports_get(m, &dport, &sport);
|
|
|
|
/*
|
|
* Find the SA and (indirectly) call the appropriate
|
|
* kernel crypto routine. The resulting mbuf chain is a valid
|
|
* IP packet ready to go through input processing.
|
|
*/
|
|
memset(&src_address, 0, sizeof (src_address));
|
|
memset(&dst_address, 0, sizeof(dst_address));
|
|
src_address.sa.sa_family = af;
|
|
dst_address.sa.sa_family = af;
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
src_address.sin.sin_len = sizeof(struct sockaddr_in);
|
|
dst_address.sin.sin_len = sizeof(struct sockaddr_in);
|
|
m_copydata(m, offsetof(struct ip, ip_src),
|
|
sizeof(struct in_addr),
|
|
&src_address.sin.sin_addr);
|
|
m_copydata(m, offsetof(struct ip, ip_dst),
|
|
sizeof(struct in_addr),
|
|
&dst_address.sin.sin_addr);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
src_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
|
|
m_copydata(m, offsetof(struct ip6_hdr, ip6_src),
|
|
sizeof(struct in6_addr),
|
|
&src_address.sin6.sin6_addr);
|
|
m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
|
|
sizeof(struct in6_addr),
|
|
&dst_address.sin6.sin6_addr);
|
|
if (sa6_recoverscope(&dst_address.sin6)) {
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
IPSECLOG(LOG_DEBUG, "unsupported protocol family %u\n", af);
|
|
m_freem(m);
|
|
IPSEC_ISTAT(sproto, ESP_STAT_NOPF, AH_STAT_NOPF,
|
|
IPCOMP_STAT_NOPF);
|
|
return EPFNOSUPPORT;
|
|
}
|
|
|
|
/* NB: only pass dst since key_lookup_sa follows RFC2401 */
|
|
sav = KEY_LOOKUP_SA(&dst_address, sproto, spi, sport, dport);
|
|
if (sav == NULL) {
|
|
static struct timeval lasttime = {0, 0};
|
|
static int curpps = 0;
|
|
|
|
if (!ipsec_debug && ppsratecheck(&lasttime, &curpps, 1)) {
|
|
if (sport || dport) {
|
|
log(LOG_INFO,
|
|
"no key association found for SA"
|
|
" %s[%u]-%s[%u]/SPI 0x%08lx\n",
|
|
ipsec_address(&src_address, buf, sizeof(buf)),
|
|
ntohs(sport),
|
|
ipsec_address(&dst_address, buf2, sizeof(buf2)),
|
|
ntohs(dport),
|
|
(u_long) ntohl(spi));
|
|
} else {
|
|
log(LOG_INFO,
|
|
"no key association found for"
|
|
" SA %s-%s/SPI 0x%08lx\n",
|
|
ipsec_address(&src_address, buf, sizeof(buf)),
|
|
ipsec_address(&src_address, buf2, sizeof(buf2)),
|
|
(u_long) ntohl(spi));
|
|
}
|
|
} else if (ipsec_debug) {
|
|
IPSECLOG(LOG_DEBUG,
|
|
"no key association found for SA "
|
|
"%s-%s/SPI 0x%08lx/PROTO %u/PORT %u-%u\n",
|
|
ipsec_address(&src_address, buf, sizeof(buf)),
|
|
ipsec_address(&dst_address, buf2, sizeof(buf2)),
|
|
(u_long) ntohl(spi), sproto, ntohs(dport), ntohs(sport));
|
|
}
|
|
IPSEC_ISTAT(sproto, ESP_STAT_NOTDB, AH_STAT_NOTDB,
|
|
IPCOMP_STAT_NOTDB);
|
|
m_freem(m);
|
|
return ENOENT;
|
|
}
|
|
|
|
KASSERT(sav->tdb_xform != NULL);
|
|
|
|
/*
|
|
* Call appropriate transform and return -- callback takes care of
|
|
* everything else.
|
|
*/
|
|
error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
|
|
KEY_SA_UNREF(&sav);
|
|
return error;
|
|
}
|
|
|
|
#ifdef INET
|
|
/*
|
|
* Common input handler for IPv4 AH, ESP, and IPCOMP.
|
|
*/
|
|
void
|
|
ipsec4_common_input(struct mbuf *m, int off, int proto)
|
|
{
|
|
(void)ipsec_common_input(m, off, offsetof(struct ip, ip_p),
|
|
AF_INET, proto);
|
|
}
|
|
|
|
/*
|
|
* IPsec input callback for INET protocols.
|
|
* This routine is called as the transform callback.
|
|
* Takes care of filtering and other sanity checks on
|
|
* the processed packet.
|
|
*/
|
|
int
|
|
ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav,
|
|
int skip, int protoff)
|
|
{
|
|
int prot, af __diagused, sproto;
|
|
struct ip *ip;
|
|
struct secasindex *saidx;
|
|
int error;
|
|
|
|
if (__predict_false(m == NULL)) {
|
|
panic("%s: NULL mbuf", __func__);
|
|
}
|
|
if (__predict_false(skip < sizeof(struct ip))) {
|
|
panic("%s: short skip", __func__);
|
|
}
|
|
|
|
KASSERT(sav != NULL);
|
|
saidx = &sav->sah->saidx;
|
|
af = saidx->dst.sa.sa_family;
|
|
KASSERTMSG(af == AF_INET, "unexpected af %u", af);
|
|
sproto = saidx->proto;
|
|
KASSERTMSG(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
|
|
sproto == IPPROTO_IPCOMP,
|
|
"unexpected security protocol %u", sproto);
|
|
|
|
/*
|
|
* Update the IPv4 header. The length of the packet may have changed,
|
|
* so fix it, and recompute the checksum.
|
|
*/
|
|
if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
|
|
char buf[IPSEC_ADDRSTRLEN];
|
|
cantpull:
|
|
IPSECLOG(LOG_DEBUG,
|
|
"processing failed for SA %s/%08lx\n",
|
|
ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi));
|
|
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
error = ENOBUFS;
|
|
goto bad;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
|
|
|
|
/*
|
|
* Update TCP/UDP checksum
|
|
* XXX: should only do it in NAT-T case
|
|
* XXX: should do it incrementally, see FreeBSD code.
|
|
*/
|
|
m = ipsec4_fixup_checksum(m);
|
|
if (m == NULL)
|
|
goto cantpull;
|
|
ip = mtod(m, struct ip *);
|
|
|
|
prot = ip->ip_p;
|
|
|
|
M_VERIFY_PACKET(m);
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
|
|
if ((inetsw[ip_protox[prot]].pr_flags & PR_LASTHDR) != 0 &&
|
|
ipsec_in_reject(m, NULL)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* There is no struct ifnet for tunnel mode IP-IP tunnel connecttion,
|
|
* so we cannot write filtering rule to the inner packet.
|
|
*/
|
|
if (saidx->mode == IPSEC_MODE_TUNNEL)
|
|
m->m_pkthdr.pkthdr_flags |= PKTHDR_FLAG_IPSEC_SKIP_PFIL;
|
|
|
|
(*inetsw[ip_protox[prot]].pr_input)(m, skip, prot);
|
|
return 0;
|
|
|
|
bad:
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
int
|
|
ipsec6_common_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
int l = 0;
|
|
int protoff, nxt;
|
|
struct ip6_ext ip6e;
|
|
|
|
if (*offp < sizeof(struct ip6_hdr)) {
|
|
IPSECLOG(LOG_DEBUG, "bad offset %u\n", *offp);
|
|
IPSEC_ISTAT(proto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
m_freem(*mp);
|
|
return IPPROTO_DONE;
|
|
} else if (*offp == sizeof(struct ip6_hdr)) {
|
|
protoff = offsetof(struct ip6_hdr, ip6_nxt);
|
|
} else {
|
|
/* Chase down the header chain... */
|
|
protoff = sizeof(struct ip6_hdr);
|
|
nxt = (mtod(*mp, struct ip6_hdr *))->ip6_nxt;
|
|
|
|
do {
|
|
protoff += l;
|
|
m_copydata(*mp, protoff, sizeof(ip6e), &ip6e);
|
|
|
|
if (nxt == IPPROTO_AH)
|
|
l = (ip6e.ip6e_len + 2) << 2;
|
|
else if (nxt == IPPROTO_FRAGMENT)
|
|
l = sizeof(struct ip6_frag);
|
|
else
|
|
l = (ip6e.ip6e_len + 1) << 3;
|
|
KASSERT(l > 0);
|
|
|
|
nxt = ip6e.ip6e_nxt;
|
|
} while (protoff + l < *offp);
|
|
|
|
/* Malformed packet check */
|
|
if (protoff + l != *offp) {
|
|
IPSECLOG(LOG_DEBUG, "bad packet header chain, "
|
|
"protoff %u, l %u, off %u\n", protoff, l, *offp);
|
|
IPSEC_ISTAT(proto, ESP_STAT_HDROPS,
|
|
AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
m_freem(*mp);
|
|
*mp = NULL;
|
|
return IPPROTO_DONE;
|
|
}
|
|
protoff += offsetof(struct ip6_ext, ip6e_nxt);
|
|
}
|
|
(void) ipsec_common_input(*mp, *offp, protoff, AF_INET6, proto);
|
|
return IPPROTO_DONE;
|
|
}
|
|
|
|
/*
|
|
* IPsec input callback, called by the transform callback. Takes care of
|
|
* filtering and other sanity checks on the processed packet.
|
|
*/
|
|
int
|
|
ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
|
|
int protoff)
|
|
{
|
|
int af __diagused, sproto;
|
|
struct ip6_hdr *ip6;
|
|
struct secasindex *saidx;
|
|
int nxt;
|
|
u_int8_t prot;
|
|
int error, nest;
|
|
|
|
if (__predict_false(m == NULL)) {
|
|
panic("%s: NULL mbuf", __func__);
|
|
}
|
|
|
|
KASSERT(sav != NULL);
|
|
saidx = &sav->sah->saidx;
|
|
af = saidx->dst.sa.sa_family;
|
|
KASSERTMSG(af == AF_INET6, "unexpected af %u", af);
|
|
sproto = saidx->proto;
|
|
KASSERTMSG(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
|
|
sproto == IPPROTO_IPCOMP,
|
|
"unexpected security protocol %u", sproto);
|
|
|
|
/* Fix IPv6 header */
|
|
if (m->m_len < sizeof(struct ip6_hdr) &&
|
|
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
|
|
char buf[IPSEC_ADDRSTRLEN];
|
|
IPSECLOG(LOG_DEBUG, "processing failed for SA %s/%08lx\n",
|
|
ipsec_address(&sav->sah->saidx.dst,
|
|
buf, sizeof(buf)), (u_long) ntohl(sav->spi));
|
|
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS, AH_STAT_HDROPS,
|
|
IPCOMP_STAT_HDROPS);
|
|
error = EACCES;
|
|
goto bad;
|
|
}
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
|
|
m_copydata(m, protoff, sizeof(prot), &prot);
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
|
|
/*
|
|
* See the end of ip6_input for this logic.
|
|
* IPPROTO_IPV[46] case will be processed just like other ones
|
|
*/
|
|
nest = 0;
|
|
nxt = prot;
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
|
|
IP6_STATINC(IP6_STAT_TOOMANYHDR);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
M_VERIFY_PACKET(m);
|
|
|
|
/*
|
|
* Protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < skip) {
|
|
IP6_STATINC(IP6_STAT_TOOSHORT);
|
|
in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m),
|
|
ifs6_in_truncated);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Enforce IPsec policy checking if we are seeing last header.
|
|
* Note that we do not visit this with protocols with pcb layer
|
|
* code - like udp/tcp/raw ip.
|
|
*/
|
|
if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
|
|
ipsec_in_reject(m, NULL)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* There is no struct ifnet for tunnel mode IP-IP tunnel connecttion,
|
|
* so we cannot write filtering rule to the inner packet.
|
|
*/
|
|
if (saidx->mode == IPSEC_MODE_TUNNEL)
|
|
m->m_pkthdr.pkthdr_flags |= PKTHDR_FLAG_IPSEC_SKIP_PFIL;
|
|
|
|
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt);
|
|
}
|
|
return 0;
|
|
|
|
bad:
|
|
if (m)
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
#endif /* INET6 */
|