Author: cy
Date: Tue Oct 13 04:19:49 2015
New Revision: 289210
URL: https://svnweb.freebsd.org/changeset/base/289210
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/10/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
==============================================================================
--- stable/10/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 13
03:12:55 2015 (r289209)
+++ stable/10/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 13
04:19:49 2015 (r289210)
@@ -1134,6 +1134,22 @@ ipf_checkv4sum(fin)
return -1;
}
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 0;
+ }
+ }
+
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
sum = m->m_pkthdr.csum_data;
else
_______________________________________________
svn-src-all@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
