Added RIPng as contrib (ticket #301)

Author: phil777

scapy/contrib/ripng.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+# http://trac.secdev.org/scapy/ticket/301
+
+# scapy.contrib.description = RIPng
+# scapy.contrib.status = loads
+
+from scapy.packet import *
+from scapy.fields import *
+from scapy.layers.inet import UDP
+from scapy.layers.inet6 import *
+
+class RIPng(Packet):
+    name = "RIPng header"
+    fields_desc = [
+                    ByteEnumField("cmd", 1, {1 : "req", 2 : "resp"}),
+                    ByteField("ver", 1),
+                    ShortField("null", 0),
+            ]
+
+class RIPngEntry(Packet):
+    name = "RIPng entry"
+    fields_desc = [
+                    ConditionalField(IP6Field("prefix", "::"),
+                                            lambda pkt: pkt.metric != 255),
+                    ConditionalField(IP6Field("nexthop", "::"),
+                                            lambda pkt: pkt.metric == 255),
+                    ShortField("routetag", 0),
+                    ByteField("prefixlen", 0),
+                    ByteEnumField("metric", 1, {16 : "Unreach",
+                                                255 : "next-hop entry"})
+            ]
+
+bind_layers(UDP,        RIPng,          sport=521, dport=521)
+bind_layers(RIPng,      RIPngEntry)
+bind_layers(RIPngEntry, RIPngEntry)
+
+if __name__ == "__main__":
+    from scapy.main import interact
+    interact(mydict=globals(), mybanner="RIPng")
+