Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v
rcsdiff: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.126
retrieving revision 1.128
diff -u -p -r1.126 -r1.128
--- src/sys/netinet/udp_usrreq.c	2004/12/17 22:54:52	1.126
+++ src/sys/netinet/udp_usrreq.c	2004/12/19 06:42:24	1.128
@@ -1,4 +1,4 @@
-/*	$NetBSD: udp_usrreq.c,v 1.126 2004/12/17 22:54:52 christos Exp $	*/
+/*	$NetBSD: udp_usrreq.c,v 1.128 2004/12/19 06:42:24 christos Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.126 2004/12/17 22:54:52 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.128 2004/12/19 06:42:24 christos Exp $");
 
 #include "opt_inet.h"
 #include "opt_ipsec.h"
@@ -141,7 +141,7 @@ int	udpcksum = 1;
 #else
 int	udpcksum = 0;		/* XXX */
 #endif
-int	udp_do_loopback_cksum = 1;
+int	udp_do_loopback_cksum = 0;
 
 struct	inpcbtable udbtable;
 struct	udpstat udpstat;
@@ -430,9 +430,8 @@ udp6_input(struct mbuf **mp, int *offp, 
 	 * Checksum extended UDP header and data.  Maybe skip checksum
 	 * on loopback interfaces.
 	 */
-	if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
-			     IFF_LOOPBACK) ||
-			   udp_do_loopback_cksum)) {
+	if (__predict_true((m->m_flags & M_LOOP) == 0 ||
+	    udp_do_loopback_cksum)) {
 		if (uh->uh_sum == 0) {
 			udp6stat.udp6s_nosum++;
 			goto bad;