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NetBSD/sys/netipsec/ipsec_input.c

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/* $NetBSD: ipsec_input.c,v 1.43 2017/05/19 04:34:09 ozaki-r Exp $ */
/* $FreeBSD: /usr/local/www/cvsroot/FreeBSD/src/sys/netipsec/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 1.43 2017/05/19 04:34:09 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/malloc.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/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet6/scope6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet/icmp6.h>
#endif
#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>
#include <net/net_osdep.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)
/*
* ipsec_common_input gets called when an IPsec-protected packet
* is received by IPv4 or IPv6. It's 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];
union sockaddr_union dst_address;
struct secasvar *sav;
u_int32_t spi;
u_int16_t sport;
u_int16_t dport;
int s, 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 */
if (sproto == IPPROTO_ESP)
m_copydata(m, skip, sizeof(u_int32_t), &spi);
else if (sproto == IPPROTO_AH)
m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t), &spi);
else if (sproto == IPPROTO_IPCOMP) {
u_int16_t cpi;
m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t), &cpi);
spi = ntohl(htons(cpi));
} else {
panic("ipsec_common_input called with bad protocol number :"
"%d\n", sproto);
}
/* 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(&dst_address, 0, sizeof (dst_address));
dst_address.sa.sa_family = af;
switch (af) {
#ifdef INET
case AF_INET:
dst_address.sin.sin_len = sizeof(struct sockaddr_in);
m_copydata(m, offsetof(struct ip, ip_dst),
sizeof(struct in_addr),
&dst_address.sin.sin_addr);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
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 /* INET6 */
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;
}
s = splsoftnet();
/* NB: only pass dst since key_allocsa follows RFC2401 */
sav = KEY_ALLOCSA(&dst_address, sproto, spi, sport, dport);
if (sav == NULL) {
IPSECLOG(LOG_DEBUG,
"no key association found for SA %s/%08lx/%u/%u\n",
ipsec_address(&dst_address, buf, sizeof(buf)),
(u_long) ntohl(spi), sproto, ntohs(dport));
IPSEC_ISTAT(sproto, ESP_STAT_NOTDB, AH_STAT_NOTDB,
IPCOMP_STAT_NOTDB);
splx(s);
m_freem(m);
return ENOENT;
}
if (sav->tdb_xform == NULL) {
IPSECLOG(LOG_DEBUG,
"attempted to use uninitialized SA %s/%08lx/%u\n",
ipsec_address(&dst_address, buf, sizeof(buf)),
(u_long) ntohl(spi), sproto);
IPSEC_ISTAT(sproto, ESP_STAT_NOXFORM, AH_STAT_NOXFORM,
IPCOMP_STAT_NOXFORM);
KEY_FREESAV(&sav);
splx(s);
m_freem(m);
return ENXIO;
}
/*
* Call appropriate transform and return -- callback takes care of
* everything else.
*/
error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
KEY_FREESAV(&sav);
splx(s);
return error;
}
#ifdef INET
/*
* Common input handler for IPv4 AH, ESP, and IPCOMP.
*/
void
ipsec4_common_input(struct mbuf *m, ...)
{
va_list ap;
int off, nxt;
va_start(ap, m);
off = va_arg(ap, int);
nxt = va_arg(ap, int);
va_end(ap);
(void) ipsec_common_input(m, off, offsetof(struct ip, ip_p),
AF_INET, nxt);
}
/*
* 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, struct m_tag *mt)
{
int prot, af __diagused, sproto;
struct ip *ip;
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct secasindex *saidx;
int error;
IPSEC_SPLASSERT_SOFTNET("ipsec4_common_input_cb");
KASSERT(m != NULL);
KASSERT(sav != NULL);
KASSERT(sav->sah != 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);
/* Sanity check */
if (m == NULL) {
IPSECLOG(LOG_DEBUG, "null mbuf");
IPSEC_ISTAT(sproto, ESP_STAT_BADKCR, AH_STAT_BADKCR,
IPCOMP_STAT_BADKCR);
KEY_FREESAV(&sav);
return EINVAL;
}
/* Fix IPv4 header */
if (m->m_len < skip && (m = m_pullup(m, skip)) == 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 = ENOBUFS;
goto bad;
}
ip = mtod(m, struct ip *);
ip->ip_len = htons(m->m_pkthdr.len);
prot = ip->ip_p;
/* IP-in-IP encapsulation */
if (prot == IPPROTO_IPIP) {
struct ip ipn;
/* ipn will now contain the inner IPv4 header */
m_copydata(m, ip->ip_hl << 2, sizeof(struct ip), &ipn);
#ifdef notyet
/* XXX PROXY address isn't recorded in SAH */
/*
* Check that the inner source address is the same as
* the proxy address, if available.
*/
if ((saidx->proxy.sa.sa_family == AF_INET &&
saidx->proxy.sin.sin_addr.s_addr !=
INADDR_ANY &&
ipn.ip_src.s_addr !=
saidx->proxy.sin.sin_addr.s_addr) ||
(saidx->proxy.sa.sa_family != AF_INET &&
saidx->proxy.sa.sa_family != 0)) {
char ipbuf[INET_ADDRSTRLEN];
IPSECLOG(LOG_DEBUG,
"inner source address %s doesn't correspond to "
"expected proxy source %s, SA %s/%08lx\n",
IN_PRINT(ipbuf, ipn.ip_src),
ipsp_address(saidx->proxy),
ipsp_address(saidx->dst),
(u_long) ntohl(sav->spi));
IPSEC_ISTAT(sproto, ESP_STAT_PDROPS,
AH_STAT_PDROPS,
IPCOMP_STAT_PDROPS);
error = EACCES;
goto bad;
}
#endif /*XXX*/
}
#if INET6
/* IPv6-in-IP encapsulation. */
if (prot == IPPROTO_IPV6) {
struct ip6_hdr ip6n;
/* ip6n will now contain the inner IPv6 header. */
m_copydata(m, ip->ip_hl << 2, sizeof(struct ip6_hdr), &ip6n);
#ifdef notyet
/*
* Check that the inner source address is the same as
* the proxy address, if available.
*/
if ((saidx->proxy.sa.sa_family == AF_INET6 &&
!IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
!IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
&saidx->proxy.sin6.sin6_addr)) ||
(saidx->proxy.sa.sa_family != AF_INET6 &&
saidx->proxy.sa.sa_family != 0)) {
char ip6buf[INET6_ADDRSTRLEN];
char pbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN];
IPSECLOG(LOG_DEBUG,
"inner source address %s doesn't correspond to "
"expected proxy source %s, SA %s/%08lx\n",
ip6_sprintf(ip6buf, &ip6n.ip6_src),
ipsec_address(&saidx->proxy, pbuf, sizeof(pbuf)),
ipsec_address(&saidx->dst, dbuf, sizeof(dbuf)),
(u_long) ntohl(sav->spi));
IPSEC_ISTAT(sproto, ESP_STAT_PDROPS,
AH_STAT_PDROPS,
IPCOMP_STAT_PDROPS);
error = EACCES;
goto bad;
}
#endif /*XXX*/
}
#endif /* INET6 */
/*
* Record what we've done to the packet (under what SA it was
* processed). If we've been passed an mtag, it means the packet
* was already processed by an ethernet/crypto combo card and
* thus has a tag attached with all the right information, but
* with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
* PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
*/
if (mt == NULL && sproto != IPPROTO_IPCOMP) {
mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
sizeof(struct tdb_ident), M_NOWAIT);
if (mtag == NULL) {
IPSECLOG(LOG_DEBUG, "failed to get tag\n");
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS,
AH_STAT_HDROPS, IPCOMP_STAT_HDROPS);
error = ENOMEM;
goto bad;
}
tdbi = (struct tdb_ident *)(mtag + 1);
memcpy(&tdbi->dst, &saidx->dst, saidx->dst.sa.sa_len);
tdbi->proto = sproto;
tdbi->spi = sav->spi;
m_tag_prepend(m, mtag);
} else {
if (mt != NULL)
mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
/* XXX do we need to mark m_flags??? */
}
key_sa_recordxfer(sav, m); /* record data transfer */
if ((inetsw[ip_protox[prot]].pr_flags & PR_LASTHDR) != 0 &&
ipsec4_in_reject(m, NULL)) {
error = EINVAL;
goto bad;
}
(*inetsw[ip_protox[prot]].pr_input)(m, skip, prot);
return 0;
bad:
m_freem(m);
return error;
}
#endif /* INET */
#ifdef INET6
/* IPv6 AH wrapper. */
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
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;
}
extern const struct ip6protosw inet6sw[];
extern u_char ip6_protox[];
/*
* 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,
struct m_tag *mt)
{
int af __diagused, sproto;
struct ip6_hdr *ip6;
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct secasindex *saidx;
int nxt;
u_int8_t prot, nxt8;
int error, nest;
KASSERT(m != NULL);
KASSERT(sav != NULL);
KASSERT(sav->sah != 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);
/* Sanity check */
if (m == NULL) {
IPSECLOG(LOG_DEBUG, "null mbuf");
IPSEC_ISTAT(sproto, ESP_STAT_BADKCR, AH_STAT_BADKCR,
IPCOMP_STAT_BADKCR);
error = EINVAL;
goto bad;
}
/* 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));
/* Save protocol */
m_copydata(m, protoff, 1, &prot);
#ifdef INET
/* IP-in-IP encapsulation */
if (prot == IPPROTO_IPIP) {
struct ip ipn;
/* ipn will now contain the inner IPv4 header */
m_copydata(m, skip, sizeof(struct ip), &ipn);
#ifdef notyet
/*
* Check that the inner source address is the same as
* the proxy address, if available.
*/
if ((saidx->proxy.sa.sa_family == AF_INET &&
saidx->proxy.sin.sin_addr.s_addr != INADDR_ANY &&
ipn.ip_src.s_addr != saidx->proxy.sin.sin_addr.s_addr) ||
(saidx->proxy.sa.sa_family != AF_INET &&
saidx->proxy.sa.sa_family != 0)) {
char ipbuf[INET_ADDRSTRLEN];
char pbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN];
IPSECLOG(LOG_DEBUG,
"inner source address %s doesn't correspond to "
"expected proxy source %s, SA %s/%08lx\n",
IN_PRINT(ipbuf, ipn.ip_src),
ipsec_address(&saidx->proxy, pbuf, sizeof(pbuf)),
ipsec_address(&saidx->dst, dbuf, sizeof(dbuf)),
(u_long) ntohl(sav->spi));
IPSEC_ISTAT(sproto, ESP_STAT_PDROPS,
AH_STAT_PDROPS, IPCOMP_STAT_PDROPS);
error = EACCES;
goto bad;
}
#endif /*XXX*/
}
#endif /* INET */
/* IPv6-in-IP encapsulation */
if (prot == IPPROTO_IPV6) {
struct ip6_hdr ip6n;
/* ip6n will now contain the inner IPv6 header. */
m_copydata(m, skip, sizeof(struct ip6_hdr), &ip6n);
#ifdef notyet
/*
* Check that the inner source address is the same as
* the proxy address, if available.
*/
if ((saidx->proxy.sa.sa_family == AF_INET6 &&
!IN6_IS_ADDR_UNSPECIFIED(&saidx->proxy.sin6.sin6_addr) &&
!IN6_ARE_ADDR_EQUAL(&ip6n.ip6_src,
&saidx->proxy.sin6.sin6_addr)) ||
(saidx->proxy.sa.sa_family != AF_INET6 &&
saidx->proxy.sa.sa_family != 0)) {
char ip6buf[INET6_ADDRSTRLEN];
char pbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN];
IPSECLOG(LOG_DEBUG,
"inner source address %s doesn't correspond to "
"expected proxy source %s, SA %s/%08lx\n",
ip6_sprintf(ip6buf, &ip6n.ip6_src),
ipsec_address(&saidx->proxy, pbuf, sizeof(pbuf)),
ipsec_address(&saidx->dst, dbuf, sizeof(dbuf)),
(u_long) ntohl(sav->spi));
IPSEC_ISTAT(sproto, ESP_STAT_PDROPS,
AH_STAT_PDROPS, IPCOMP_STAT_PDROPS);
error = EACCES;
goto bad;
}
#endif /*XXX*/
}
/*
* Record what we've done to the packet (under what SA it was
* processed). If we've been passed an mtag, it means the packet
* was already processed by an ethernet/crypto combo card and
* thus has a tag attached with all the right information, but
* with a PACKET_TAG_IPSEC_IN_CRYPTO_DONE as opposed to
* PACKET_TAG_IPSEC_IN_DONE type; in that case, just change the type.
*/
if (mt == NULL && sproto != IPPROTO_IPCOMP) {
mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
sizeof(struct tdb_ident), M_NOWAIT);
if (mtag == NULL) {
IPSECLOG(LOG_DEBUG, "failed to get tag\n");
IPSEC_ISTAT(sproto, ESP_STAT_HDROPS,
AH_STAT_HDROPS, IPCOMP_STAT_HDROPS);
error = ENOMEM;
goto bad;
}
tdbi = (struct tdb_ident *)(mtag + 1);
memcpy(&tdbi->dst, &saidx->dst, sizeof(union sockaddr_union));
tdbi->proto = sproto;
tdbi->spi = sav->spi;
m_tag_prepend(m, mtag);
} else {
if (mt != NULL)
mt->m_tag_id = PACKET_TAG_IPSEC_IN_DONE;
/* XXX do we need to mark m_flags??? */
}
key_sa_recordxfer(sav, m);
/* Retrieve new protocol */
m_copydata(m, protoff, sizeof(u_int8_t), &nxt8);
/*
* See the end of ip6_input for this logic.
* IPPROTO_IPV[46] case will be processed just like other ones
*/
nest = 0;
nxt = nxt8;
while (nxt != IPPROTO_DONE) {
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
IP6_STATINC(IP6_STAT_TOOMANYHDR);
error = EINVAL;
goto bad;
}
/*
* 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 &&
ipsec6_in_reject(m, NULL)) {
error = EINVAL;
goto bad;
}
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt);
}
return 0;
bad:
if (m)
m_freem(m);
return error;
}
#endif /* INET6 */
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