Author: fjoe
Date: Thu Sep 27 18:15:01 2012
New Revision: 241002
URL: http://svn.freebsd.org/changeset/base/241002
Log:
Fix pseudo checksum calculation.
This fixes ipfilter w/ network controllers that implement only
partial rx csum offloading.
PR: 106438
Obtained from: upstream
MFC after: 1 week
Modified:
head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
Modified: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
==============================================================================
--- head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Thu Sep 27 17:48:04
2012 (r241001)
+++ head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Thu Sep 27 18:15:01
2012 (r241002)
@@ -1357,7 +1357,9 @@ fr_info_t *fin;
else
sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
htonl(m->m_pkthdr.csum_data +
- fin->fin_ip->ip_len + fin->fin_p));
+ fin->fin_ip->ip_len -
+ (fin->fin_ip->ip_hl << 2) +
+ fin->fin_p));
sum ^= 0xffff;
if (sum != 0) {
fin->fin_flx |= FI_BAD;
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