From 436d222fff66862036635a637b0d9471f02faaf3 Mon Sep 17 00:00:00 2001
From: david <david@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Fri, 3 May 2013 05:59:54 +0000
Subject: [PATCH] Fix bug: unset bits properly

---
 libnetutil/IPv4Header.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libnetutil/IPv4Header.cc b/libnetutil/IPv4Header.cc
index 1891fbd7f..7c8f84c03 100644
--- a/libnetutil/IPv4Header.cc
+++ b/libnetutil/IPv4Header.cc
@@ -370,7 +370,7 @@ int IPv4Header::setRF(){
 
 /** Unset RF flag */
 int IPv4Header::unsetRF(){
-  h.ip_off ^= htons(IP_RF);
+  h.ip_off = h.ip_off & ~(htons(IP_RF));
   return OP_SUCCESS;
 } /* End of unsetRF() */
 
@@ -390,7 +390,7 @@ int IPv4Header::setMF(){
 
 /** Unset MF flag */
 int IPv4Header::unsetMF(){
-  h.ip_off ^= htons(IP_MF);
+  h.ip_off = h.ip_off & ~(htons(IP_MF));
   return OP_SUCCESS;
 } /* End of unsetMF() */
 
@@ -410,7 +410,7 @@ int IPv4Header::setDF(){
 
 /** Unset DF flag */
 int IPv4Header::unsetDF(){
-  h.ip_off ^= htons(IP_DF);
+  h.ip_off = h.ip_off & ~(htons(IP_DF));
   return OP_SUCCESS;
 } /* End of unsetDF() */