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Strip IP header only when we act in tunnel mode.

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MFC after:	1 week
Sponsored by:	Yandex LLC
This commit is contained in:
Andrey V. Elsukov 2014-11-13 10:48:59 +00:00
parent ab2164e0b5
commit 612faae7a2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=274466
1 changed files with 43 additions and 42 deletions
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85
sys/netipsec/ipsec_input.c
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@ -671,8 +671,8 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int proto
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
/* Save protocol */
prot = 0;
m_copydata(m, protoff, 1, (unsigned char *) &prot);
m_copydata(m, protoff, 1, &nxt8);
prot = nxt8;
#ifdef DEV_ENC
if_inc_counter(encif, IFCOUNTER_IPACKETS, 1);
@ -684,9 +684,47 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int proto
return (error);
#endif /* DEV_ENC */
/* IPv6-in-IP encapsulation */
if (prot == IPPROTO_IPV6 &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* ip6n will now contain the inner IPv6 header. */
m_striphdr(m, 0, skip);
skip = 0;
#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)) {
DPRINTF(("%s: inner source address %s doesn't "
"correspond to expected proxy source %s, "
"SA %s/%08lx\n", __func__,
ip6_sprintf(ip6buf, &ip6n.ip6_src),
ipsec_address(&saidx->proxy),
ipsec_address(&saidx->dst),
(u_long) ntohl(sav->spi)));
IPSEC_ISTAT(sproto, pdrops);
error = EACCES;
goto bad;
}
#endif /* notyet */
}
#ifdef INET
/* IP-in-IP encapsulation */
if (prot == IPPROTO_IPIP) {
else if (prot == IPPROTO_IPIP &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
@ -721,41 +759,8 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int proto
#endif /* notyet */
}
#endif /* INET */
/* IPv6-in-IP encapsulation */
if (prot == IPPROTO_IPV6) {
if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* ip6n will now contain the inner IPv6 header. */
m_striphdr(m, 0, skip);
skip = 0;
#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)) {
DPRINTF(("%s: inner source address %s doesn't "
"correspond to expected proxy source %s, "
"SA %s/%08lx\n", __func__,
ip6_sprintf(ip6buf, &ip6n.ip6_src),
ipsec_address(&saidx->proxy),
ipsec_address(&saidx->dst),
(u_long) ntohl(sav->spi)));
IPSEC_ISTAT(sproto, pdrops);
error = EACCES;
goto bad;
}
#endif /* notyet */
else {
prot = IPPROTO_IPV6; /* for correct BPF processing */
}
/*
@ -807,10 +812,6 @@ ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, int proto
if ((error = ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER)) != 0)
return (error);
#endif /* DEV_ENC */
/* Retrieve new protocol */
/* We have stripped the IP6 header from the mbuf, we have to use the backuped proto value instead */
nxt8 = prot;
/*
* See the end of ip6_input for this logic.
* IPPROTO_IPV[46] case will be processed just like other ones