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CLNS Extension
:copyright: 2014, 2015 BENOCS GmbH, Berlin (Germany)
:author: Marcel Patzlaff,
:license: GPLv2
This module is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This module is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
This module provides a registration function and a generic PDU
for OSI Connectionless-mode Network Services (such as IS-IS).
import struct
from scapy.config import conf
from scapy.fields import ByteEnumField, PacketField
from scapy.layers.l2 import LLC
from scapy.packet import Packet, bind_top_down, bind_bottom_up
from scapy.compat import orb
network_layer_protocol_ids = {
0x00: "Null",
0x08: "Q.933",
0x80: "IEEE SNAP",
0x81: "ISO 8438 CLNP",
0x82: "ISO 9542 ES-IS",
0x83: "ISO 10589 IS-IS",
0x8E: "IPv6",
0xB0: "FRF.9",
0xB1: "FRF.12",
0xC0: "TRILL",
0xC1: "IEEE",
0xCC: "IPv4",
0xCF: "PPP"
_cln_protocols = {}
class _GenericClnsPdu(Packet):
name = "Generic CLNS PDU"
fields_desc = [
ByteEnumField("nlpid", 0x00, network_layer_protocol_ids),
PacketField("rawdata", None, conf.raw_layer)
def _create_cln_pdu(s, **kwargs):
pdu_cls = conf.raw_layer
if len(s) >= 1:
nlpid = orb(s[0])
pdu_cls = _cln_protocols.get(nlpid, _GenericClnsPdu)
return pdu_cls(s, **kwargs)
def register_cln_protocol(nlpid, cln_protocol_class):
if nlpid is None or cln_protocol_class is None:
chk = _cln_protocols.get(nlpid, None)
if chk is not None and chk != cln_protocol_class:
raise ValueError("different protocol already registered!")
_cln_protocols[nlpid] = cln_protocol_class
bind_top_down(LLC, cln_protocol_class, dsap=0xfe, ssap=0xfe, ctrl=3)
bind_top_down(LLC, _GenericClnsPdu, dsap=0xfe, ssap=0xfe, ctrl=3)
bind_bottom_up(LLC, _create_cln_pdu, dsap=0xfe, ssap=0xfe, ctrl=3)