patch-2.4.20 linux-2.4.20/net/ipv4/netfilter/ipt_unclean.c

• Lines: 20
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/net/ipv4/netfilter/ipt_unclean.c
• Orig date: Fri Dec 21 09:42:05 2001

diff -urN linux-2.4.19/net/ipv4/netfilter/ipt_unclean.c linux-2.4.20/net/ipv4/netfilter/ipt_unclean.c
@@ -211,15 +211,14 @@
 
 	/* Bad checksum?  Don't print, just say it's unclean. */
 	/* FIXME: SRC ROUTE packets won't match checksum --RR */
-	if (!more_frags && !embedded
+	if (!more_frags && !embedded && udph->check
 	    && csum_tcpudp_magic(iph->saddr, iph->daddr, datalen, IPPROTO_UDP,
 				 csum_partial((char *)udph, datalen, 0)) != 0)
 		return 0;
 
-	/* CHECK: Ports can't be zero. */
-	if (!udph->source || !udph->dest) {
-		limpk("UDP zero ports %u/%u\n",
-		      ntohs(udph->source), ntohs(udph->dest));
+	/* CHECK: Destination port can't be zero. */
+	if (!udph->dest) {
+		limpk("UDP zero destination port\n");
 		return 0;
 	}