svn commit: r349648 - stable/11/sys/netpfil/ipfw

[Andrey V. Elsukov]

Author: ae
Date: Wed Jul  3 09:51:59 2019
New Revision: 349648
URL: https://svnweb.freebsd.org/changeset/base/349648

Log:
  MFC r349366:
    Follow the RFC 3128 and drop short TCP fragments with offset = 1.

Modified:
  stable/11/sys/netpfil/ipfw/ip_fw2.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/netpfil/ipfw/ip_fw2.c
==============================================================================
--- stable/11/sys/netpfil/ipfw/ip_fw2.c	Wed Jul  3 09:49:47 2019	(r349647)
+++ stable/11/sys/netpfil/ipfw/ip_fw2.c	Wed Jul  3 09:51:59 2019	(r349648)
@@ -1686,6 +1686,11 @@ do {								\
 			default:
 				break;
 			}
+		} else {
+			if (offset == 1 && proto == IPPROTO_TCP) {
+				/* RFC 3128 */
+				goto pullup_failed;
+			}
 		}
 
 		ip = mtod(m, struct ip *);