Add Ipv4Address::CombineMask, and implement Ipv4Address::IsBroadcast.

src/node/ipv4-address.cc

@@ -151,8 +151,14 @@ Ipv4Address::CombineMask (Ipv4Mask const &mask) const
   return Ipv4Address (GetHostOrder () & mask.GetHostOrder ());
 }
 
+bool
+Ipv4Address::IsBroadcast (void) const
+{
+  return (m_address == 0xffffffffU);
+}
+
 bool 
-Ipv4Address::IsMulticast (void)
+Ipv4Address::IsMulticast (void) const
 {
   // XXX
   return false;

src/node/ipv4-address.h

@@ -82,8 +82,8 @@ public:
    */
   void Print (std::ostream &os) const;
 
-  bool IsBroadcast (void);
-  bool IsMulticast (void);
+  bool IsBroadcast (void) const;
+  bool IsMulticast (void) const;
   /**
    * \brief Combine this address with a network mask
    *