From 0 Mon Sep 17 00:00:00 2001
From: Mikhail Efremov <sem@altlinux.org>
Date: Tue, 30 Oct 2012 18:45:41 +0400
Subject: [PATCH 21] Ignore checksums on the loopback interface.

Applied no_loopback_checksum patch from Debian.
Debian bug #478532.

diff --git a/dhcp/common/packet.c b/dhcp/common/packet.c
index defaced..defaced 100644
--- a/dhcp/common/packet.c
+++ b/dhcp/common/packet.c
@@ -365,6 +365,10 @@ decode_udp_ip_header(struct interface_info *interface,
 
   /* UDP check sum may be optional (udp.uh_sum == 0) or not ready if checksum
    * offloading is in use */
+  if (interface -> hw_address.hbuf [0] == 0) {
+    udp.uh_sum = 0;
+  }
+
   udp_packets_seen++;
   if (udp.uh_sum && csum_ready) {
 	/* Check the UDP header checksum - since the received packet header