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===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v
retrieving revision 1.53
retrieving revision 1.54
diff -u -p -r1.53 -r1.54
--- src/sys/netinet/udp_usrreq.c	1999/12/13 15:17:21	1.53
+++ src/sys/netinet/udp_usrreq.c	1999/12/22 04:03:01	1.54
@@ -1,4 +1,4 @@
-/*	$NetBSD: udp_usrreq.c,v 1.53 1999/12/13 15:17:21 itojun Exp $	*/
+/*	$NetBSD: udp_usrreq.c,v 1.54 1999/12/22 04:03:01 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -375,6 +375,13 @@ udp6_input(mp, offp, proto)
 		goto bad;
 	}
 
+	/* Be proactive about malicious use of IPv4 mapped address */
+	if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
+	    IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
+		/* XXX stat */
+		goto bad;
+	}
+
 	/*
 	 * Checksum extended UDP header and data.
 	 */