Author: ae
Date: Tue Jun 25 11:40:37 2019
New Revision: 349366
URL: https://svnweb.freebsd.org/changeset/base/349366
Log:
Follow the RFC 3128 and drop short TCP fragments with offset = 1.
Reported by: emaste
MFC after: 1 week
Modified:
head/sys/netpfil/ipfw/ip_fw2.c
Modified: head/sys/netpfil/ipfw/ip_fw2.c
==============================================================================
--- head/sys/netpfil/ipfw/ip_fw2.c Tue Jun 25 09:11:22 2019
(r349365)
+++ head/sys/netpfil/ipfw/ip_fw2.c Tue Jun 25 11:40:37 2019
(r349366)
@@ -1719,6 +1719,11 @@ do {
\
default:
break;
}
+ } else {
+ if (offset == 1 && proto == IPPROTO_TCP) {
+ /* RFC 3128 */
+ goto pullup_failed;
+ }
}
UPDATE_POINTERS();
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