# HG changeset patch
# Parent 67134631ad73d7e84c04726682b457b8f917cbbf
fix the problem on using IPv4 raw socket with ns-3-simu

diff -r 67134631ad73 src/internet-stack/ipv4-l3-protocol.cc
--- a/src/internet-stack/ipv4-l3-protocol.cc	Sun Apr 04 22:34:42 2010 +0900
+++ b/src/internet-stack/ipv4-l3-protocol.cc	Sun Apr 04 22:50:37 2010 +0900
@@ -545,8 +545,8 @@
   // 4) packet is not broadcast, and is passed in with a route entry but route->GetGateway is not set (e.g., on-demand)
   // 5) packet is not broadcast, and route is NULL (e.g., a raw socket call, or ICMP)
   
-  // 1) packet is destined to limited broadcast address
-  if (destination.IsBroadcast ()) 
+  // 1) packet is destined to limited broadcast address or link-local multicast address
+  if (destination.IsBroadcast () || destination.IsLocalMulticast ())
     {
       NS_LOG_LOGIC ("Ipv4L3Protocol::Send case 1:  limited broadcast");
       ipHeader = BuildHeader (source, destination, protocol, packet->GetSize (), ttl, mayFragment);
diff -r 67134631ad73 src/node/ipv4-address.cc
--- a/src/node/ipv4-address.cc	Sun Apr 04 22:34:42 2010 +0900
+++ b/src/node/ipv4-address.cc	Sun Apr 04 22:50:37 2010 +0900
@@ -240,6 +240,13 @@
   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
 {
diff -r 67134631ad73 src/node/ipv4-address.h
--- a/src/node/ipv4-address.h	Sun Apr 04 22:34:42 2010 +0900
+++ b/src/node/ipv4-address.h	Sun Apr 04 22:50:37 2010 +0900
@@ -112,6 +112,10 @@
     */
   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
    *
    * This method returns an IPv4 address that is this address combined
diff -r 67134631ad73 src/routing/static-routing/ipv4-static-routing.cc
--- a/src/routing/static-routing/ipv4-static-routing.cc	Sun Apr 04 22:34:42 2010 +0900
+++ b/src/routing/static-routing/ipv4-static-routing.cc	Sun Apr 04 22:50:37 2010 +0900
@@ -222,6 +222,20 @@
   Ptr<Ipv4Route> rtentry = 0;
   uint16_t longest_mask = 0;
   uint32_t shortest_metric = 0xffffffff;
+  /* when sending on local multicast, there have to be interface specified */
+  if (dest.IsLocalMulticast ())
+    {
+      NS_ASSERT_MSG (oif, "Try to send on link-local multicast address, and no interface index is given!");
+
+      rtentry = Create<Ipv4Route> ();
+      rtentry->SetDestination (dest);
+      rtentry->SetGateway (Ipv4Address::GetZero ());
+      rtentry->SetOutputDevice (oif);
+      rtentry->SetSource (m_ipv4->GetAddress (oif->GetIfIndex (), 0).GetLocal ());
+      return rtentry;
+    }
+
+
   for (NetworkRoutesI i = m_networkRoutes.begin (); 
        i != m_networkRoutes.end (); 
        i++)