Author: cy
Date: Sun Sep 29 03:41:15 2019
New Revision: 352866
URL: https://svnweb.freebsd.org/changeset/base/352866
Log:
MFC r352737:
ipf mistakenly regards UDP packets with a checksum of 0xffff as bad.
Obtained from: NetBSD fil.c r1.30, NetBSD PR/54443
Modified:
stable/11/sys/contrib/ipfilter/netinet/fil.c
Directory Properties:
stable/11/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/10/sys/contrib/ipfilter/netinet/fil.c
stable/12/sys/contrib/ipfilter/netinet/fil.c
Directory Properties:
stable/10/ (props changed)
stable/12/ (props changed)
Modified: stable/11/sys/contrib/ipfilter/netinet/fil.c
==============================================================================
--- stable/11/sys/contrib/ipfilter/netinet/fil.c Sun Sep 29 03:36:50
2019 (r352865)
+++ stable/11/sys/contrib/ipfilter/netinet/fil.c Sun Sep 29 03:41:15
2019 (r352866)
@@ -6730,8 +6730,11 @@ ipf_checkl4sum(fin)
/*NOTREACHED*/
}
- if (csump != NULL)
+ if (csump != NULL) {
hdrsum = *csump;
+ if (fin->fin_p == IPPROTO_UDP && hdrsum == 0xffff)
+ hdrsum = 0x0000;
+ }
if (dosum) {
sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);
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