bug 491: It is painful to enable all checksums

src/node/node.cc

@@ -28,6 +28,8 @@
 #include "ns3/uinteger.h"
 #include "ns3/log.h"
 #include "ns3/assert.h"
+#include "ns3/global-value.h"
+#include "ns3/boolean.h"
 
 NS_LOG_COMPONENT_DEFINE ("Node");
 
@@ -35,6 +37,11 @@ namespace ns3{
 
 NS_OBJECT_ENSURE_REGISTERED (Node);
 
+GlobalValue g_checksumEnabled  = GlobalValue ("ChecksumEnabled",
+                                              "A global switch to enable all checksums for all protocols",
+                                              BooleanValue (false),
+                                              MakeBooleanChecker ());
+
 TypeId 
 Node::GetTypeId (void)
 {
@@ -222,6 +229,14 @@ Node::UnregisterProtocolHandler (ProtocolHandler handler)
     }
 }
 
+bool
+Node::ChecksumEnabled (void)
+{
+  BooleanValue val;
+  g_checksumEnabled.GetValue (val);
+  return val.Get ();
+}
+
 bool
 Node::PromiscReceiveFromDevice (Ptr<NetDevice> device, Ptr<const Packet> packet, uint16_t protocol,
                                 const Address &from, const Address &to, NetDevice::PacketType packetType)