Begin icmp6 in controller -> pass special info

p4app/controller.py

@@ -1,3 +1,5 @@
+from __future__ import unicode_literals
+
 import nnpy
 import struct
 
@@ -16,17 +18,28 @@ import argparse
 import subprocess
 
 # Broken in python2
-#import ipaddress
+import ipaddress
 
 logging.basicConfig()
 log = logging.getLogger("main")
 
+
+
+class CpuHeader(Packet):
+    name = 'CpuPacket'
+    fields_desc = [BitField('ingress_port', 0, 16)]
+
+
 class L2Controller(object):
     def __init__(self, sw_name):
         # Command line mapping
         self.modes = ['base', 'router']
 
 
+        self.info={}
+        self.info['ndp_multicast'] = ipaddress.ip_network("ff02::1:ff00:0/104")
+
+
         self.address_suffix = 42
 
         # Network / egress
@@ -145,9 +158,13 @@ class L2Controller(object):
 
         self.controller.table_clear("v6_addresses")
         for v6addr in self.v6_addresses[self.mode]:
-            self.controller.table_add("v6_addresses", "icmp6_answer", [v6addr['addr']])
+            self.controller.table_add("v6_addresses", "send_to_controller", [v6addr['addr']])
 
 
+    def gen_ndp_multicast_addr(self, addr):
+        """ append the 24 bit of the address to the multicast address"""
+        return ipaddress.ip_address(int(self.info['ndp_multicast']) + (int(addr) & 0xffffff))
+
     def config_hosts(self):
         """ Assumptions:
         - all routes are networks (no /128 v6 or /32 v4
@@ -207,10 +224,15 @@ class L2Controller(object):
 
         self.debug_print_pkg(pkg)
 
-        if packet.type == 0x800:
+        if packet.type == 0x0800:
             pass
         elif packet.type == 0x86dd:
             pass
+
+        elif packet.type == 0x4242:
+            # CPU header included
+            print("Special handling needed")
+            pass
         else:
             print("Broken pkg: {}".format(pkg))
             return