# This file is part of Scapy
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# Scapy is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# any later version.
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#
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# Scapy is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
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# scapy.contrib.description = ISIS
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# scapy.contrib.status = loads
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"""
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IS-IS Scapy Extension
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~~~~~~~~~~~~~~~~~~~~~
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:copyright: 2014-2016 BENOCS GmbH, Berlin (Germany)
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:author: Marcel Patzlaff, mpatzlaff@benocs.com
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Michal Kaliszan, mkaliszan@benocs.com
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:license: GPLv2
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This module is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This module is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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:description:
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This module provides Scapy layers for the Intermediate System
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to Intermediate System routing protocol as defined in RFC 1195.
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Currently it (partially) supports the packaging/encoding
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requirements of the following RFCs:
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* RFC 1195 (only the TCP/IP related part)
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* RFC 3358 (optional checksums)
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* RFC 5301 (dynamic hostname extension)
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* RFC 5302 (domain-wide prefix distribution)
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* RFC 5303 (three-way handshake)
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* RFC 5304 (cryptographic authentication)
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* RFC 5308 (routing IPv6 with IS-IS)
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:TODO:
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- packet relations (requests, responses)
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- support for recent RFCs:
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* RFC 5305 (traffic engineering)
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* RFC 5307 (support for G-MPLS)
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* RFC 5310 (generic cryptographic authentication)
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* RFC 5316 (inter-AS MPLS and G-MPLS TE)
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"""
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from __future__ import absolute_import
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import struct
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import random
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from scapy.config import conf
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from scapy.fields import *
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from scapy.packet import *
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from scapy.layers.clns import network_layer_protocol_ids, register_cln_protocol
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from scapy.layers.inet6 import IP6ListField, IP6Field
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from scapy.utils import fletcher16_checkbytes
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from scapy.volatile import RandString, RandByte
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import random
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from scapy.modules.six.moves import range
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from scapy.compat import raw
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EXT_VERSION = "v0.0.2"
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conf.debug_dissector = True
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#######################################################################
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## ISIS Utilities + Fields ##
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#######################################################################
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def isis_area2str(area):
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return b"".join(hex_bytes(x) for x in area.split("."))
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def isis_str2area(s):
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if len(s) == 0:
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return ""
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numbytes = len(s[1:])
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fmt = "%02X" + (".%02X%02X" * (numbytes // 2)) + ("" if (numbytes % 2) == 0 else ".%02X")
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return fmt % tuple(orb(x) for x in s)
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def isis_sysid2str(sysid):
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return b"".join(hex_bytes(x) for x in sysid.split("."))
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def isis_str2sysid(s):
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return ("%02X%02X."*3)[:-1] % tuple(orb(x) for x in s)
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def isis_nodeid2str(nodeid):
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return isis_sysid2str(nodeid[:-3]) + hex_bytes(nodeid[-2:])
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def isis_str2nodeid(s):
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return "%s.%02X" % (isis_str2sysid(s[:-1]), orb(s[-1]))
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def isis_lspid2str(lspid):
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return isis_nodeid2str(lspid[:-3]) + hex_bytes(lspid[-2:])
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def isis_str2lspid(s):
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return "%s-%02X" % (isis_str2nodeid(s[:-1]), orb(s[-1]))
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class _ISIS_IdFieldBase(Field):
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__slots__ = ["to_str", "to_id", "length"]
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def __init__(self, name, default, length, to_str, to_id):
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self.to_str = to_str
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self.to_id = to_id
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self.length = length
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Field.__init__(self, name, default, "%is" % length)
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def i2m(self, pkt, x):
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if x is None:
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return b"\0"*self.length
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return self.to_str(x)
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def m2i(self, pkt, x):
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return self.to_id(x)
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def any2i(self, pkt, x):
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if isinstance(x, str) and len(x) == self.length:
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return self.m2i(pkt, x)
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return x
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class _ISIS_RandId(RandString):
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def __init__(self, template):
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self.bytecount = template.count("*")
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self.format = template.replace("*", "%02X")
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def _fix(self):
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if self.bytecount == 0:
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return ""
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val = ()
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for _ in range(self.bytecount):
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val += (RandByte(),)
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return self.format % val
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class _ISIS_RandAreaId(_ISIS_RandId):
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def __init__(self, bytecount= None):
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self.bytecount = random.randint(1, 13) if bytecount is None else bytecount
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self.format = "%02X" + (".%02X%02X" * ((self.bytecount-1) // 2)) + ("" if ((self.bytecount-1) % 2) == 0 else ".%02X")
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class ISIS_AreaIdField(Field):
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__slots__ = ["length_from"]
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def __init__(self, name, default, length_from):
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Field.__init__(self, name, default)
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self.length_from = length_from
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def i2m(self, pkt, x):
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return isis_area2str(x)
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def m2i(self, pkt, x):
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return isis_str2area(x)
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def i2len(self, pkt, x):
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if x is None:
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return 0
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l = len(x)
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# l/5 is the number of dots in the Area ID
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return (l - (l // 5)) // 2
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def addfield(self, pkt, s, val):
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sval = self.i2m(pkt, val)
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return s+struct.pack("!%is" % len(sval), sval)
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def getfield(self, pkt, s):
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numbytes = self.length_from(pkt)
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return s[numbytes:], self.m2i(pkt, struct.unpack("!%is" % numbytes, s[:numbytes])[0])
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def randval(self):
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return _ISIS_RandAreaId()
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class ISIS_SystemIdField(_ISIS_IdFieldBase):
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def __init__(self, name, default):
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_ISIS_IdFieldBase.__init__(self, name, default, 6, isis_sysid2str, isis_str2sysid)
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def randval(self):
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return _ISIS_RandId("**.**.**")
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class ISIS_NodeIdField(_ISIS_IdFieldBase):
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def __init__(self, name, default):
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_ISIS_IdFieldBase.__init__(self, name, default, 7, isis_nodeid2str, isis_str2nodeid)
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def randval(self):
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return _ISIS_RandId("**.**.**.*")
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class ISIS_LspIdField(_ISIS_IdFieldBase):
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def __init__(self, name, default):
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_ISIS_IdFieldBase.__init__(self, name, default, 8, isis_lspid2str, isis_str2lspid)
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def randval(self):
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return _ISIS_RandId("**.**.**.*-*")
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class ISIS_CircuitTypeField(FlagsField):
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def __init__(self, name="circuittype", default=2, size=8,
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names=None):
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if names is None:
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names = ["L1", "L2", "r0", "r1", "r2", "r3", "r4", "r5"]
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FlagsField.__init__(self, name, default, size, names)
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def _ISIS_GuessTlvClass_Helper(tlv_classes, defaultname, p, **kargs):
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cls = conf.raw_layer
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if len(p) >= 2:
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tlvtype = orb(p[0])
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clsname = tlv_classes.get(tlvtype, defaultname)
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cls = globals()[clsname]
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return cls(p, **kargs)
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class _ISIS_GenericTlv_Base(Packet):
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fields_desc = [ByteField("type", 0),
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FieldLenField("len", None, length_of="val", fmt="B"),
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BoundStrLenField("val", "", length_from=lambda pkt: pkt.len)]
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def guess_payload_class(self, p):
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return conf.padding_layer
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class ISIS_GenericTlv(_ISIS_GenericTlv_Base):
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name = "ISIS Generic TLV"
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class ISIS_GenericSubTlv(_ISIS_GenericTlv_Base):
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name = "ISIS Generic Sub-TLV"
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#######################################################################
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## ISIS Sub-TLVs for TLVs 22, 23, 141, 222, 223 ##
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#######################################################################
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_isis_subtlv_classes_1 = {
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4: "ISIS_LinkLocalRemoteIdentifiersSubTlv",
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6: "ISIS_IPv4InterfaceAddressSubTlv",
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8: "ISIS_IPv4NeighborAddressSubTlv",
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12: "ISIS_IPv6InterfaceAddressSubTlv",
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13: "ISIS_IPv6NeighborAddressSubTlv"
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}
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_isis_subtlv_names_1 = {
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4: "Link Local/Remote Identifiers",
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6: "IPv4 Interface Address",
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8: "IPv4 Neighbor Address",
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12: "IPv6 Interface Address",
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13: "IPv6 Neighbor Address"
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}
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def _ISIS_GuessSubTlvClass_1(p, **kargs):
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return _ISIS_GuessTlvClass_Helper(_isis_subtlv_classes_1, "ISIS_GenericSubTlv", p, **kargs)
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class ISIS_IPv4InterfaceAddressSubTlv(ISIS_GenericSubTlv):
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name = "ISIS IPv4 Interface Address (S)"
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fields_desc = [ByteEnumField("type", 6, _isis_subtlv_names_1),
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FieldLenField("len", None, length_of= "address", fmt="B"),
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IPField("address", "0.0.0.0")]
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class ISIS_IPv4NeighborAddressSubTlv(ISIS_GenericSubTlv):
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name = "ISIS IPv4 Neighbor Address (S)"
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fields_desc = [ByteEnumField("type", 8, _isis_subtlv_names_1),
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FieldLenField("len", None, length_of= "address", fmt="B"),
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IPField("address", "0.0.0.0")]
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class ISIS_LinkLocalRemoteIdentifiersSubTlv(ISIS_GenericSubTlv):
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name = "ISIS Link Local/Remote Identifiers (S)"
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fields_desc = [ByteEnumField("type", 4, _isis_subtlv_names_1),
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FieldLenField("len", 8, fmt="B"),
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IntField("localid", "0"),
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IntField("remoteid", "0")]
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class ISIS_IPv6InterfaceAddressSubTlv(ISIS_GenericSubTlv):
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name = "ISIS IPv6 Interface Address (S)"
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fields_desc = [ByteEnumField("type", 12, _isis_subtlv_names_1),
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FieldLenField("len", None, length_of= "address", fmt="B"),
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IP6Field("address", "::")]
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class ISIS_IPv6NeighborAddressSubTlv(ISIS_GenericSubTlv):
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name = "ISIS IPv6 Neighbor Address (S)"
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fields_desc = [ByteEnumField("type", 13, _isis_subtlv_names_1),
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FieldLenField("len", None, length_of= "address", fmt="B"),
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IP6Field("address", "::")]
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#######################################################################
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## ISIS Sub-TLVs for TLVs 135, 235, 236, and 237 ##
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#######################################################################
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_isis_subtlv_classes_2 = {
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1: "ISIS_32bitAdministrativeTagSubTlv",
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2: "ISIS_64bitAdministrativeTagSubTlv"
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}
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_isis_subtlv_names_2 = {
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1: "32-bit Administrative Tag",
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2: "64-bit Administrative Tag"
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}
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def _ISIS_GuessSubTlvClass_2(p, **kargs):
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return _ISIS_GuessTlvClass_Helper(_isis_subtlv_classes_2, "ISIS_GenericSubTlv", p, **kargs)
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class ISIS_32bitAdministrativeTagSubTlv(ISIS_GenericSubTlv):
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name = "ISIS 32-bit Administrative Tag (S)"
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fields_desc = [ByteEnumField("type", 1, _isis_subtlv_names_2),
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FieldLenField("len", None, length_of= "tags", fmt="B"),
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FieldListField("tags", [], IntField("", 0), count_from= lambda pkt: pkt.len // 4)]
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class ISIS_64bitAdministrativeTagSubTlv(ISIS_GenericSubTlv):
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name = "ISIS 64-bit Administrative Tag (S)"
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fields_desc = [ByteEnumField("type", 2, _isis_subtlv_names_2),
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FieldLenField("len", None, length_of= "tags", fmt="B"),
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FieldListField("tags", [], LongField("", 0), count_from= lambda pkt: pkt.len // 8)]
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#######################################################################
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## ISIS TLVs ##
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#######################################################################
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_isis_tlv_classes = {
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1: "ISIS_AreaTlv",
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2: "ISIS_IsReachabilityTlv",
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6: "ISIS_IsNeighbourTlv",
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8: "ISIS_PaddingTlv",
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9: "ISIS_LspEntryTlv",
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10: "ISIS_AuthenticationTlv",
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12: "ISIS_ChecksumTlv",
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14: "ISIS_BufferSizeTlv",
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22: "ISIS_ExtendedIsReachabilityTlv",
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128: "ISIS_InternalIpReachabilityTlv",
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129: "ISIS_ProtocolsSupportedTlv",
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130: "ISIS_ExternalIpReachabilityTlv",
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132: "ISIS_IpInterfaceAddressTlv",
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135: "ISIS_ExtendedIpReachabilityTlv",
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137: "ISIS_DynamicHostnameTlv",
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232: "ISIS_Ipv6InterfaceAddressTlv",
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236: "ISIS_Ipv6ReachabilityTlv",
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240: "ISIS_P2PAdjacencyStateTlv"
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}
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_isis_tlv_names = {
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1: "Area TLV",
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2: "IS Reachability TLV",
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6: "IS Neighbour TLV",
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7: "Instance Identifier TLV",
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8: "Padding TLV",
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9: "LSP Entries TLV",
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10: "Authentication TLV",
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12: "Optional Checksum TLV",
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13: "Purge Originator Identification TLV",
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14: "LSP Buffer Size TLV",
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22: "Extended IS-Reachability TLV",
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23: "IS Neighbour Attribute TLV",
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24: "IS Alias ID",
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128: "IP Internal Reachability TLV",
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129: "Protocols Supported TLV",
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130: "IP External Reachability TLV",
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131: "Inter-Domain Routing Protocol Information TLV",
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132: "IP Interface Address TLV",
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134: "Traffic Engineering Router ID TLV",
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135: "Extended IP Reachability TLV",
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137: "Dynamic Hostname TLV",
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138: "GMPLS Shared Risk Link Group TLV",
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139: "IPv6 Shared Risk Link Group TLV",
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140: "IPv6 Traffic Engineering Router ID TLV",
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141: "Inter-AS Reachability Information TLV",
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142: "Group Address TLV",
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143: "Multi-Topology-Aware Port Capability TLV",
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144: "Multi-Topology Capability TLV",
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145: "TRILL Neighbour TLV",
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147: "MAC-Reachability TLV",
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148: "BFD-Enabled TLV",
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211: "Restart TLV",
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222: "Multi-Topology Intermediate Systems TLV",
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223: "Multi-Topology IS Neighbour Attributes TLV",
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229: "Multi-Topology TLV",
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232: "IPv6 Interface Address TLV",
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233: "IPv6 Global Interface Address TLV",
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235: "Multi-Topology IPv4 Reachability TLV",
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236: "IPv6 Reachability TLV",
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237: "Multi-Topology IPv6 Reachability TLV",
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240: "Point-to-Point Three-Way Adjacency TLV",
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242: "IS-IS Router Capability TLV",
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251: "Generic Information TLV"
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}
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def _ISIS_GuessTlvClass(p, **kargs):
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return _ISIS_GuessTlvClass_Helper(_isis_tlv_classes, "ISIS_GenericTlv", p, **kargs)
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class ISIS_AreaEntry(Packet):
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name = "ISIS Area Entry"
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fields_desc = [FieldLenField("arealen", None, length_of="areaid", fmt="B"),
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ISIS_AreaIdField("areaid", "49", length_from=lambda pkt: pkt.arealen)]
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def extract_padding(self, s):
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return "", s
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class ISIS_AreaTlv(ISIS_GenericTlv):
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name = "ISIS Area TLV"
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fields_desc = [ByteEnumField("type", 1, _isis_tlv_names),
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FieldLenField("len", None, length_of= "areas", fmt="B"),
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PacketListField("areas", [], ISIS_AreaEntry, length_from=lambda x: x.len)]
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class ISIS_AuthenticationTlv(ISIS_GenericTlv):
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name = "ISIS Authentication TLV"
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fields_desc = [ByteEnumField("type", 10, _isis_tlv_names),
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FieldLenField("len", None, length_of= "password", adjust=lambda pkt,x: x + 1, fmt="B"),
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ByteEnumField("authtype", 1, {1: "Plain", 17: "HMAC-MD5"}),
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BoundStrLenField("password", "", maxlen= 254, length_from=lambda pkt: pkt.len - 1)]
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class ISIS_BufferSizeTlv(ISIS_GenericTlv):
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name = "ISIS Buffer Size TLV"
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fields_desc = [ByteEnumField("type", 14, _isis_tlv_names),
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ByteField("len", 2),
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ShortField("lspbuffersize", 1497)]
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class ISIS_ChecksumTlv(ISIS_GenericTlv):
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name = "ISIS Optional Checksum TLV"
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fields_desc = [ByteEnumField("type", 12, _isis_tlv_names),
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ByteField("len", 2),
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XShortField("checksum", None)]
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class ISIS_DynamicHostnameTlv(ISIS_GenericTlv):
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name = "ISIS Dynamic Hostname TLV"
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fields_desc = [ByteEnumField("type", 137, _isis_tlv_names),
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FieldLenField("len", None, length_of= "hostname", fmt="B"),
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BoundStrLenField("hostname", "", length_from=lambda pkt: pkt.len)]
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class ISIS_ExtendedIpPrefix(Packet):
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name = "ISIS Extended IP Prefix"
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fields_desc = [
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IntField("metric", 1),
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BitField("updown", 0, 1),
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BitField("subtlvindicator", 0, 1),
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BitFieldLenField("pfxlen", None, 6, length_of="pfx"),
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IPPrefixField("pfx", None, wordbytes=1, length_from=lambda x: x.pfxlen),
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ConditionalField(FieldLenField("subtlvslen", None, length_of="subtlvs", fmt= "B"), lambda pkt: pkt.subtlvindicator == 1),
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ConditionalField(PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_2, length_from=lambda x: x.subtlvslen), lambda pkt: pkt.subtlvindicator == 1)
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]
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def extract_padding(self, s):
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return "", s
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class ISIS_ExtendedIpReachabilityTlv(ISIS_GenericTlv):
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name = "ISIS Extended IP Reachability TLV"
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fields_desc = [ByteEnumField("type", 135, _isis_tlv_names),
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FieldLenField("len", None, length_of="pfxs", fmt="B"),
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PacketListField("pfxs", [], ISIS_ExtendedIpPrefix, length_from= lambda pkt: pkt.len)]
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class ISIS_ExtendedIsNeighbourEntry(Packet):
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name = "ISIS Extended IS Neighbour Entry"
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fields_desc = [
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ISIS_NodeIdField("neighbourid", "0102.0304.0506.07"),
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ThreeBytesField("metric", 1),
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FieldLenField("subtlvslen", None, length_of="subtlvs", fmt= "B"),
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PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_1, length_from=lambda x: x.subtlvslen)
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]
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def extract_padding(self, s):
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return "", s
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class ISIS_ExtendedIsReachabilityTlv(ISIS_GenericTlv):
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name = "ISIS Extended IS Reachability TLV"
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fields_desc = [ByteEnumField("type", 22, _isis_tlv_names),
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FieldLenField("len", None, length_of="neighbours", fmt="B"),
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PacketListField("neighbours", [], ISIS_ExtendedIsNeighbourEntry, length_from=lambda x: x.len)]
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class ISIS_IpInterfaceAddressTlv(ISIS_GenericTlv):
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name = "ISIS IP Interface Address TLV"
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fields_desc = [ByteEnumField("type", 132, _isis_tlv_names),
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FieldLenField("len", None, length_of= "addresses", fmt="B"),
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FieldListField("addresses", [], IPField("", "0.0.0.0"), count_from= lambda pkt: pkt.len // 4)]
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class ISIS_Ipv6InterfaceAddressTlv(ISIS_GenericTlv):
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name = "ISIS IPv6 Interface Address TLV"
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fields_desc = [
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ByteEnumField("type", 232, _isis_tlv_names),
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FieldLenField("len", None, length_of="addresses", fmt="B"),
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IP6ListField("addresses", [], count_from=lambda pkt: pkt.len // 16)
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]
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class ISIS_Ipv6Prefix(Packet):
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name = "ISIS IPv6 Prefix"
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fields_desc = [
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IntField("metric", 1),
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BitField("updown", 0, 1),
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BitField("external", 0, 1),
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BitField("subtlvindicator", 0, 1),
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BitField("reserved", 0, 5),
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FieldLenField("pfxlen", None, length_of="pfx", fmt="B"),
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IP6PrefixField("pfx", None, wordbytes=1, length_from=lambda x: x.pfxlen),
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ConditionalField(FieldLenField("subtlvslen", None, length_of="subtlvs", fmt= "B"), lambda pkt: pkt.subtlvindicator == 1),
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ConditionalField(PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_2, length_from=lambda x: x.subtlvslen), lambda pkt: pkt.subtlvindicator == 1)
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]
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def extract_padding(self, s):
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return "", s
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class ISIS_Ipv6ReachabilityTlv(ISIS_GenericTlv):
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name= "ISIS IPv6 Reachability TLV"
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fields_desc = [ByteEnumField("type", 236, _isis_tlv_names),
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FieldLenField("len", None, length_of= "pfxs", fmt="B"),
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PacketListField("pfxs", [], ISIS_Ipv6Prefix, length_from= lambda pkt: pkt.len)]
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class ISIS_IsNeighbourTlv(ISIS_GenericTlv):
|
name = "ISIS IS Neighbour TLV"
|
fields_desc = [ByteEnumField("type", 6, _isis_tlv_names),
|
FieldLenField("len", None, length_of= "neighbours", fmt="B"),
|
FieldListField("neighbours", [], MACField("", "00.00.00.00.00.00"), count_from= lambda pkt: pkt.len // 6)]
|
|
|
class ISIS_LspEntry(Packet):
|
name = "ISIS LSP Entry"
|
fields_desc = [ShortField("lifetime", 1200),
|
ISIS_LspIdField("lspid", "0102.0304.0506.07-08"),
|
XIntField("seqnum", 0x00000001),
|
XShortField("checksum", None)]
|
|
def extract_padding(self, s):
|
return "", s
|
|
|
class ISIS_LspEntryTlv(ISIS_GenericTlv):
|
name = "ISIS LSP Entry TLV"
|
fields_desc = [
|
ByteEnumField("type", 9, _isis_tlv_names),
|
FieldLenField("len", None, length_of="entries", fmt="B"),
|
PacketListField("entries", [], ISIS_LspEntry, count_from=lambda pkt: pkt.len // 16)
|
]
|
|
|
class _AdjacencyStateTlvLenField(Field):
|
def i2m(self, pkt, x):
|
if pkt.neighbourextlocalcircuitid is not None:
|
return 15
|
|
if pkt.neighboursystemid is not None:
|
return 11
|
|
if pkt.extlocalcircuitid is not None:
|
return 5
|
|
return 1
|
|
|
class ISIS_P2PAdjacencyStateTlv(ISIS_GenericTlv):
|
name = "ISIS P2P Adjacency State TLV"
|
fields_desc = [ByteEnumField("type", 240, _isis_tlv_names),
|
_AdjacencyStateTlvLenField("len", None, fmt="B"),
|
ByteEnumField("state", "Down", {0x2 : "Down", 0x1 : "Initialising", 0x0 : "Up"}),
|
ConditionalField(IntField("extlocalcircuitid", None), lambda pkt: pkt.len >= 5),
|
ConditionalField(ISIS_SystemIdField("neighboursystemid", None), lambda pkt: pkt.len >= 11),
|
ConditionalField(IntField("neighbourextlocalcircuitid", None), lambda pkt: pkt.len == 15)]
|
|
|
# TODO dynamically allocate sufficient size
|
class ISIS_PaddingTlv(ISIS_GenericTlv):
|
name = "ISIS Padding TLV"
|
fields_desc = [
|
ByteEnumField("type", 8, _isis_tlv_names),
|
FieldLenField("len", None, length_of="padding", fmt="B"),
|
BoundStrLenField("padding", "", length_from=lambda pkt: pkt.len)
|
]
|
|
|
class ISIS_ProtocolsSupportedTlv(ISIS_GenericTlv):
|
name = "ISIS Protocols Supported TLV"
|
fields_desc = [
|
ByteEnumField("type", 129, _isis_tlv_names),
|
FieldLenField("len", None, count_of="nlpids", fmt="B"),
|
FieldListField("nlpids", [], ByteEnumField("", "IPv4", network_layer_protocol_ids), count_from=lambda pkt: pkt.len)
|
]
|
|
|
#######################################################################
|
## ISIS Old-Style TLVs ##
|
#######################################################################
|
|
class ISIS_IpReachabilityEntry(Packet):
|
name = "ISIS IP Reachability"
|
fields_desc = [ByteField("defmetric", 1),
|
ByteField("delmetric", 0x80),
|
ByteField("expmetric", 0x80),
|
ByteField("errmetric", 0x80),
|
IPField("ipaddress", "0.0.0.0"),
|
IPField("subnetmask", "255.255.255.255")]
|
|
def extract_padding(self, s):
|
return "", s
|
|
|
class ISIS_InternalIpReachabilityTlv(ISIS_GenericTlv):
|
name = "ISIS Internal IP Reachability TLV"
|
fields_desc = [
|
ByteEnumField("type", 128, _isis_tlv_names),
|
FieldLenField("len", None, length_of="entries", fmt="B"),
|
PacketListField("entries", [], ISIS_IpReachabilityEntry, count_from=lambda x: x.len // 12)
|
]
|
|
|
class ISIS_ExternalIpReachabilityTLV(ISIS_GenericTlv):
|
name = "ISIS External IP Reachability TLV"
|
fields_desc = [
|
ByteEnumField("type", 130, _isis_tlv_names),
|
FieldLenField("len", None, length_of="entries", fmt="B"),
|
PacketListField("entries", [], ISIS_IpReachabilityEntry, count_from=lambda x: x.len // 12)
|
]
|
|
|
class ISIS_IsReachabilityEntry(Packet):
|
name = "ISIS IS Reachability"
|
fields_desc = [ByteField("defmetric", 1),
|
ByteField("delmetric", 0x80),
|
ByteField("expmetric", 0x80),
|
ByteField("errmetric", 0x80),
|
ISIS_NodeIdField("neighbourid", "0102.0304.0506.07")]
|
|
def extract_padding(self, s):
|
return "", s
|
|
|
class ISIS_IsReachabilityTlv(ISIS_GenericTlv):
|
name = "ISIS IS Reachability TLV"
|
fields_desc = [
|
ByteEnumField("type", 2, _isis_tlv_names),
|
FieldLenField("len", None, fmt="B", length_of="neighbours", adjust=lambda pkt,x: x+1),
|
ByteField("virtual", 0),
|
PacketListField("neighbours", [], ISIS_IsReachabilityEntry, count_from=lambda x: (x.len - 1) // 11)
|
]
|
|
#######################################################################
|
## ISIS PDU Packets ##
|
#######################################################################
|
_isis_pdu_names = {
|
15: "L1 LAN Hello",
|
16: "L2 LAN Hello",
|
17: "P2P Hello",
|
18: "L1 LSP",
|
20: "L2 LSP",
|
24: "L1 CSNP",
|
25: "L2 CSNP",
|
26: "L1 PSNP",
|
27: "L2 PSNP"
|
}
|
|
|
class ISIS_CommonHdr(Packet):
|
name = "ISIS Common Header"
|
fields_desc = [
|
ByteEnumField("nlpid", 0x83, network_layer_protocol_ids),
|
ByteField("hdrlen", None),
|
ByteField("version", 1),
|
ByteField("idlen", 0),
|
ByteEnumField("pdutype", None, _isis_pdu_names),
|
ByteField("pduversion", 1),
|
ByteField("hdrreserved", 0),
|
ByteField("maxareaaddr", 0)
|
]
|
|
def post_build(self, pkt, pay):
|
# calculating checksum if requested
|
pdu = pkt + pay
|
checksumInfo = self[1].checksum_info(self.hdrlen)
|
|
if checksumInfo is not None:
|
(cbegin, cpos) = checksumInfo
|
checkbytes = fletcher16_checkbytes(pdu[cbegin:], (cpos - cbegin))
|
pdu = pdu[:cpos] + checkbytes + pdu[cpos+2:]
|
|
return pdu
|
|
|
class _ISIS_PduBase(Packet):
|
def checksum_info(self, hdrlen):
|
checksumPosition = hdrlen
|
for tlv in self.tlvs:
|
if isinstance(tlv, ISIS_ChecksumTlv):
|
checksumPosition += 2
|
return (0, checksumPosition)
|
else:
|
checksumPosition += len(tlv)
|
|
return None
|
|
def guess_payload_class(self, p):
|
return conf.padding_layer
|
|
|
class _ISIS_PduLengthField(FieldLenField):
|
def __init__(self):
|
FieldLenField.__init__(self, "pdulength", None, length_of="tlvs", adjust=lambda pkt,x: x + pkt.underlayer.hdrlen)
|
|
|
class _ISIS_TlvListField(PacketListField):
|
def __init__(self):
|
PacketListField.__init__(self, "tlvs", [], _ISIS_GuessTlvClass, length_from= lambda pkt: pkt.pdulength - pkt.underlayer.hdrlen)
|
|
|
class _ISIS_LAN_HelloBase(_ISIS_PduBase):
|
fields_desc = [
|
ISIS_CircuitTypeField(),
|
ISIS_SystemIdField("sourceid", "0102.0304.0506"),
|
ShortField("holdingtime", 30),
|
_ISIS_PduLengthField(),
|
ByteField("priority", 1),
|
ISIS_NodeIdField("lanid", "0000.0000.0000.00"),
|
_ISIS_TlvListField()
|
]
|
|
|
class ISIS_L1_LAN_Hello(_ISIS_LAN_HelloBase):
|
name = "ISIS L1 LAN Hello PDU"
|
|
|
class ISIS_L2_LAN_Hello(_ISIS_LAN_HelloBase):
|
name = "ISIS L2 LAN Hello PDU"
|
|
|
class ISIS_P2P_Hello(_ISIS_PduBase):
|
name = "ISIS Point-to-Point Hello PDU"
|
|
fields_desc = [
|
ISIS_CircuitTypeField(),
|
ISIS_SystemIdField("sourceid", "0102.0304.0506"),
|
ShortField("holdingtime", 30),
|
_ISIS_PduLengthField(),
|
ByteField("localcircuitid", 0),
|
_ISIS_TlvListField()
|
]
|
|
|
class _ISIS_LSP_Base(_ISIS_PduBase):
|
fields_desc = [
|
_ISIS_PduLengthField(),
|
ShortField("lifetime", 1199),
|
ISIS_LspIdField("lspid", "0102.0304.0506.00-00"),
|
XIntField("seqnum", 0x00000001),
|
XShortField("checksum", None),
|
FlagsField("typeblock", 0x03, 8, ["L1", "L2", "OL", "ADef", "ADel", "AExp", "AErr", "P"]),
|
_ISIS_TlvListField()
|
]
|
|
def checksum_info(self, hdrlen):
|
if self.checksum is not None:
|
return None
|
|
return (12, 24)
|
|
|
def _lsp_answers(lsp, other, clsname):
|
# TODO
|
return 0
|
|
|
class ISIS_L1_LSP(_ISIS_LSP_Base):
|
name = "ISIS L1 Link State PDU"
|
|
def answers(self, other):
|
return _lsp_answers(self, other, "ISIS_L1_PSNP")
|
|
|
class ISIS_L2_LSP(_ISIS_LSP_Base):
|
name = "ISIS L2 Link State PDU"
|
|
def answers(self, other):
|
return _lsp_answers(self, other, "ISIS_L2_PSNP")
|
|
|
class _ISIS_CSNP_Base(_ISIS_PduBase):
|
fields_desc = [
|
_ISIS_PduLengthField(),
|
ISIS_NodeIdField("sourceid", "0102.0304.0506.00"),
|
ISIS_LspIdField("startlspid", "0000.0000.0000.00-00"),
|
ISIS_LspIdField("endlspid", "FFFF.FFFF.FFFF.FF-FF"),
|
_ISIS_TlvListField()
|
]
|
|
|
def _snp_answers(snp, other, clsname):
|
# TODO
|
return 0
|
|
|
class ISIS_L1_CSNP(_ISIS_CSNP_Base):
|
name = "ISIS L1 Complete Sequence Number Packet"
|
|
def answers(self, other):
|
return _snp_answers(self, other, "ISIS_L1_LSP")
|
|
|
class ISIS_L2_CSNP(_ISIS_CSNP_Base):
|
name = "ISIS L2 Complete Sequence Number Packet"
|
|
def answers(self, other):
|
return _snp_answers(self, other, "ISIS_L2_LSP")
|
|
|
class _ISIS_PSNP_Base(_ISIS_PduBase):
|
fields_desc = [
|
_ISIS_PduLengthField(),
|
ISIS_NodeIdField("sourceid", "0102.0304.0506.00"),
|
_ISIS_TlvListField()
|
]
|
|
|
class ISIS_L1_PSNP(_ISIS_PSNP_Base):
|
name = "ISIS L1 Partial Sequence Number Packet"
|
|
def answers(self, other):
|
return _snp_answers(self, other, "ISIS_L1_LSP")
|
|
|
class ISIS_L2_PSNP(_ISIS_PSNP_Base):
|
name = "ISIS L2 Partial Sequence Number Packet"
|
|
def answers(self, other):
|
return _snp_answers(self, other, "ISIS_L2_LSP")
|
|
register_cln_protocol(0x83, ISIS_CommonHdr)
|
bind_layers(ISIS_CommonHdr, ISIS_L1_LAN_Hello, hdrlen=27, pdutype=15)
|
bind_layers(ISIS_CommonHdr, ISIS_L2_LAN_Hello, hdrlen=27, pdutype=16)
|
bind_layers(ISIS_CommonHdr, ISIS_P2P_Hello, hdrlen=20, pdutype=17)
|
bind_layers(ISIS_CommonHdr, ISIS_L1_LSP, hdrlen=27, pdutype=18)
|
bind_layers(ISIS_CommonHdr, ISIS_L2_LSP, hdrlen=27, pdutype=20)
|
bind_layers(ISIS_CommonHdr, ISIS_L1_CSNP, hdrlen=33, pdutype=24)
|
bind_layers(ISIS_CommonHdr, ISIS_L2_CSNP, hdrlen=33, pdutype=25)
|
bind_layers(ISIS_CommonHdr, ISIS_L1_PSNP, hdrlen=17, pdutype=26)
|
bind_layers(ISIS_CommonHdr, ISIS_L2_PSNP, hdrlen=17, pdutype=27)
|
