bug 857 - Link-Local Multicast handle in Ipv4 Output processing

src/node/ipv4-address.cc

@@ -240,6 +240,13 @@ Ipv4Address::IsMulticast (void) const
   return (m_address >= 0xe0000000 && m_address <= 0xefffffff);
 }
 
+bool 
+Ipv4Address::IsLocalMulticast (void) const
+{
+  // Link-Local multicast address is 224.0.0.0/24
+  return (m_address & 0xffffff00) == 0xe0000000;
+}
+
 void
 Ipv4Address::Serialize (uint8_t buf[4]) const
 {

src/node/ipv4-address.h

@@ -111,6 +111,10 @@ public:
     * \return true only if address is in the range 224.0.0.0 - 239.255.255.255
     */
   bool IsMulticast (void) const;
+  /**
+    * \return true only if address is in local multicast address scope, 224.0.0.0/24
+    */
+  bool IsLocalMulticast (void) const;
   /**
    * \brief Combine this address with a network mask
    *