Fix IPv6 responses in nfdhcpd

Search the interface of incomming request and find binding info
(IPv6 subnet) via traversing all clients configuration and matching
cl.ifname (tap0) with the interface above.

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

diff --git a/nfdhcpd/nfdhcpd b/nfdhcpd/nfdhcpd
index bc4eb9f..959fa17 100755 (executable)
--- a/nfdhcpd/nfdhcpd
+++ b/nfdhcpd/nfdhcpd
@@ -462,7 +462,7 @@ class VMNetProxy(object): # pylint: disable=R0902
         """
         for mac in self.clients.keys():
             if self.clients[mac].ifname == ifname:
-                iface = self.client[mac].iface
+                iface = self.clients[mac].iface
                 del self.clients[mac]
 
         for ifindex in self.ifaces.keys():
@@ -600,8 +600,11 @@ class VMNetProxy(object): # pylint: disable=R0902
             return
 
         ifmac = self.get_iface_hw_addr(iface)
-        binding = self.clients[ifmac]
-        subnet = binding.net6
+        binding = [ b for b in self.clients.values() if b.ifname == iface ]
+        subnet = binding[0].net6
+        if subnet.net is None:
+          logging.debug("No IPv6 network assigned for the interface")
+          return
         ifll = subnet.make_ll64(ifmac)
 
         # Signal the kernel that it shouldn't further process the packet
@@ -636,8 +639,12 @@ class VMNetProxy(object): # pylint: disable=R0902
             return
 
         ifmac = self.get_iface_hw_addr(iface)
-        binding = self.clients[ifmac]
-        subnet = binding.net6
+        binding = [ b for b in self.clients.values() if b.ifname == iface ]
+        subnet = binding[0].net6
+        if subnet.net is None:
+          logging.debug("No IPv6 network assigned for the interface")
+          return
+
         ifll = subnet.make_ll64(ifmac)
 
         ns = IPv6(payload.get_data())