svn commit: r349644 - stable/12/sys/netpfil/ipfw

[Andrey V. Elsukov]

Author: ae
Date: Wed Jul  3 09:46:30 2019
New Revision: 349644
URL: https://svnweb.freebsd.org/changeset/base/349644

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

Modified:
  stable/12/sys/netpfil/ipfw/ip_fw2.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/netpfil/ipfw/ip_fw2.c
==============================================================================
--- stable/12/sys/netpfil/ipfw/ip_fw2.c	Wed Jul  3 09:45:02 2019	(r349643)
+++ stable/12/sys/netpfil/ipfw/ip_fw2.c	Wed Jul  3 09:46:30 2019	(r349644)
@@ -1688,6 +1688,11 @@ do {								\
 			default:
 				break;
 			}
+		} else {
+			if (offset == 1 && proto == IPPROTO_TCP) {
+				/* RFC 3128 */
+				goto pullup_failed;
+			}
 		}
 
 		ip = mtod(m, struct ip *);