Author: cy
Date: Thu Sep 26 03:09:42 2019
New Revision: 352737
URL: https://svnweb.freebsd.org/changeset/base/352737
Log:
ipf mistakenly regards UDP packets with a checksum of 0xffff as bad.
Obtained from: NetBSD fil.c r1.30, NetBSD PR/54443
MFC after: 3 days
Modified:
head/sys/contrib/ipfilter/netinet/fil.c
Modified: head/sys/contrib/ipfilter/netinet/fil.c
==============================================================================
--- head/sys/contrib/ipfilter/netinet/fil.c Thu Sep 26 02:54:45 2019
(r352736)
+++ head/sys/contrib/ipfilter/netinet/fil.c Thu Sep 26 03:09:42 2019
(r352737)
@@ -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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