Author: cy
Date: Tue Oct 13 04:23:21 2015
New Revision: 289211
URL: https://svnweb.freebsd.org/changeset/base/289211
Log:
MFC r288910: On some interfaces, ipfilter drops UDP packets with zero
checkum. This commit fixes that.
PR: 166372
Submitted by: m...@neon1.net
Reviewed by: Darren Reed <darr...@reed.wattle.id.au>
Modified:
stable/9/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
Directory Properties:
stable/9/ (props changed)
stable/9/sys/ (props changed)
Modified: stable/9/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
==============================================================================
--- stable/9/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 13
04:19:49 2015 (r289210)
+++ stable/9/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 13
04:23:21 2015 (r289211)
@@ -1361,6 +1361,22 @@ fr_info_t *fin;
ip = fin->fin_ip;
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
+ /* Depending on the driver, UDP may have zero checksum */
+ if (fin->fin_p == IPPROTO_UDP && (fin->fin_flx &
+ (FI_FRAG|FI_SHORT|FI_BAD)) == 0) {
+ udphdr_t *udp = fin->fin_dp;
+ if (udp->uh_sum == 0) {
+ /*
+ * we're good no matter what the hardware
+ * checksum flags and csum_data say (handling
+ * of csum_data for zero UDP checksum is not
+ * consistent across all drivers)
+ */
+ fin->fin_cksum = 1;
+ return;
+ }
+ }
+
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
sum = m->m_pkthdr.csum_data;
else
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