internet: (fixes #2402) IPv4 Interface forwarding state is not honored

RELEASE_NOTES

@@ -61,6 +61,7 @@ Bugs fixed
 - Bug 2396 - move utility functions to WifiPhy
 - Bug 2397 - add backoff and cw tracing to EDCA
 - Bug 2398 - add SNR tag to beacons and probe responses
+- Bug 2402 - IPv4 Interface forwarding state is not honored
 - Bug 2406 - Poor 802.11g performance in ad-hoc mode
 - Bug 2414 - UdpSocket doesn't call NotifyConnectionFailed
 - Bug 2419 - BsmApplication should use RecvFrom and not SocketAddressTag

src/aodv/model/aodv-routing-protocol.cc

@@ -521,6 +521,14 @@ RoutingProtocol::RouteInput (Ptr<const Packet> p, const Ipv4Header &header,
       return true;
     }
 
+  // Check if input device supports IP forwarding
+  if (m_ipv4->IsForwarding (iif) == false)
+    {
+      NS_LOG_LOGIC ("Forwarding disabled for this interface");
+      ecb (p, header, Socket::ERROR_NOROUTETOHOST);
+      return true;
+    }
+
   // Forwarding
   return Forwarding (p, header, ucb, ecb);
 }

src/dsdv/model/dsdv-routing-protocol.cc

@@ -467,6 +467,15 @@ RoutingProtocol::RouteInput (Ptr<const Packet> p,
         }
       return true;
     }
+
+  // Check if input device supports IP forwarding
+  if (m_ipv4->IsForwarding (iif) == false)
+    {
+      NS_LOG_LOGIC ("Forwarding disabled for this interface");
+      ecb (p, header, Socket::ERROR_NOROUTETOHOST);
+      return true;
+    }
+
   RoutingTableEntry toDst;
   if (m_routingTable.LookupRoute (dst,toDst))
     {