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esp32_bluetooth_classic_sni.../libs/scapy/contrib/isis.py

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initial commit todo: add documentation & wireshark dissector
2021-08-31 11:51:03 +00:00
# This file is part of Scapy
# Scapy 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
# any later version.
#
# Scapy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
# scapy.contrib.description = Intermediate System to Intermediate System (ISIS)
# scapy.contrib.status = loads
"""
IS-IS Scapy Extension
~~~~~~~~~~~~~~~~~~~~~
:copyright: 2014-2016 BENOCS GmbH, Berlin (Germany)
:author: Marcel Patzlaff, mpatzlaff@benocs.com
Michal Kaliszan, mkaliszan@benocs.com
: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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
:description:
This module provides Scapy layers for the Intermediate System
to Intermediate System routing protocol as defined in RFC 1195.
Currently it (partially) supports the packaging/encoding
requirements of the following RFCs:
* RFC 1195 (only the TCP/IP related part)
* RFC 3358 (optional checksums)
* RFC 5301 (dynamic hostname extension)
* RFC 5302 (domain-wide prefix distribution)
* RFC 5303 (three-way handshake)
* RFC 5304 (cryptographic authentication)
* RFC 5308 (routing IPv6 with IS-IS)
:TODO:
- packet relations (requests, responses)
- support for recent RFCs:
* RFC 5305 (traffic engineering)
* RFC 5307 (support for G-MPLS)
* RFC 5310 (generic cryptographic authentication)
* RFC 5316 (inter-AS MPLS and G-MPLS TE)
"""
from __future__ import absolute_import
import struct
import random
from scapy.config import conf
from scapy.fields import BitField, BitFieldLenField, BoundStrLenField, \
ByteEnumField, ByteField, ConditionalField, Field, FieldLenField, \
FieldListField, FlagsField, IEEEFloatField, IP6PrefixField, IPField, \
IPPrefixField, IntField, LongField, MACField, PacketListField, \
ShortField, ThreeBytesField, XIntField, XShortField
from scapy.packet import bind_layers, Packet
from scapy.layers.clns import network_layer_protocol_ids, register_cln_protocol
from scapy.layers.inet6 import IP6ListField, IP6Field
from scapy.utils import fletcher16_checkbytes
from scapy.volatile import RandString, RandByte
from scapy.modules.six.moves import range
from scapy.compat import orb, hex_bytes
EXT_VERSION = "v0.0.2"
#######################################################################
# ISIS Utilities + Fields #
#######################################################################
def isis_area2str(area):
return b"".join(hex_bytes(x) for x in area.split("."))
def isis_str2area(s):
if len(s) == 0:
return ""
numbytes = len(s[1:])
fmt = "%02X" + (".%02X%02X" * (numbytes // 2)) + ("" if (numbytes % 2) == 0 else ".%02X") # noqa: E501
return fmt % tuple(orb(x) for x in s)
def isis_sysid2str(sysid):
return b"".join(hex_bytes(x) for x in sysid.split("."))
def isis_str2sysid(s):
return ("%02X%02X." * 3)[:-1] % tuple(orb(x) for x in s)
def isis_nodeid2str(nodeid):
return isis_sysid2str(nodeid[:-3]) + hex_bytes(nodeid[-2:])
def isis_str2nodeid(s):
return "%s.%02X" % (isis_str2sysid(s[:-1]), orb(s[-1]))
def isis_lspid2str(lspid):
return isis_nodeid2str(lspid[:-3]) + hex_bytes(lspid[-2:])
def isis_str2lspid(s):
return "%s-%02X" % (isis_str2nodeid(s[:-1]), orb(s[-1]))
class _ISIS_IdFieldBase(Field):
__slots__ = ["to_str", "to_id", "length"]
def __init__(self, name, default, length, to_str, to_id):
self.to_str = to_str
self.to_id = to_id
self.length = length
Field.__init__(self, name, default, "%is" % length)
def i2m(self, pkt, x):
if x is None:
return b"\0" * self.length
return self.to_str(x)
def m2i(self, pkt, x):
return self.to_id(x)
def any2i(self, pkt, x):
if isinstance(x, str) and len(x) == self.length:
return self.m2i(pkt, x)
return x
class _ISIS_RandId(RandString):
def __init__(self, template):
RandString.__init__(self)
self.bytecount = template.count("*")
self.format = template.replace("*", "%02X")
def _fix(self):
if self.bytecount == 0:
return ""
val = ()
for _ in range(self.bytecount):
val += (RandByte(),)
return self.format % val
class _ISIS_RandAreaId(_ISIS_RandId):
def __init__(self, bytecount=None):
template = "*" + (
".**" * ((self.bytecount - 1) // 2)
) + (
"" if ((self.bytecount - 1) % 2) == 0 else ".*"
)
super(_ISIS_RandAreaId, self).__init__(template)
if bytecount is None:
self.bytecount = random.randint(1, 13)
else:
self.bytecount = bytecount
class ISIS_AreaIdField(Field):
__slots__ = ["length_from"]
def __init__(self, name, default, length_from):
Field.__init__(self, name, default)
self.length_from = length_from
def i2m(self, pkt, x):
return isis_area2str(x)
def m2i(self, pkt, x):
return isis_str2area(x)
def i2len(self, pkt, x):
if x is None:
return 0
tmp_len = len(x)
# l/5 is the number of dots in the Area ID
return (tmp_len - (tmp_len // 5)) // 2
def addfield(self, pkt, s, val):
sval = self.i2m(pkt, val)
return s + struct.pack("!%is" % len(sval), sval)
def getfield(self, pkt, s):
numbytes = self.length_from(pkt)
return s[numbytes:], self.m2i(pkt, struct.unpack("!%is" % numbytes, s[:numbytes])[0]) # noqa: E501
def randval(self):
return _ISIS_RandAreaId()
class ISIS_SystemIdField(_ISIS_IdFieldBase):
def __init__(self, name, default):
_ISIS_IdFieldBase.__init__(self, name, default, 6, isis_sysid2str, isis_str2sysid) # noqa: E501
def randval(self):
return _ISIS_RandId("**.**.**")
class ISIS_NodeIdField(_ISIS_IdFieldBase):
def __init__(self, name, default):
_ISIS_IdFieldBase.__init__(self, name, default, 7, isis_nodeid2str, isis_str2nodeid) # noqa: E501
def randval(self):
return _ISIS_RandId("**.**.**.*")
class ISIS_LspIdField(_ISIS_IdFieldBase):
def __init__(self, name, default):
_ISIS_IdFieldBase.__init__(self, name, default, 8, isis_lspid2str, isis_str2lspid) # noqa: E501
def randval(self):
return _ISIS_RandId("**.**.**.*-*")
class ISIS_CircuitTypeField(FlagsField):
def __init__(self, name="circuittype", default=2, size=8,
names=None):
if names is None:
names = ["L1", "L2", "r0", "r1", "r2", "r3", "r4", "r5"]
FlagsField.__init__(self, name, default, size, names)
def _ISIS_GuessTlvClass_Helper(tlv_classes, defaultname, p, **kargs):
cls = conf.raw_layer
if len(p) >= 2:
tlvtype = orb(p[0])
clsname = tlv_classes.get(tlvtype, defaultname)
cls = globals()[clsname]
return cls(p, **kargs)
class _ISIS_GenericTlv_Base(Packet):
fields_desc = [ByteField("type", 0),
FieldLenField("len", None, length_of="val", fmt="B"),
BoundStrLenField("val", "", length_from=lambda pkt: pkt.len)] # noqa: E501
def guess_payload_class(self, p):
return conf.padding_layer
class ISIS_GenericTlv(_ISIS_GenericTlv_Base):
name = "ISIS Generic TLV"
class ISIS_GenericSubTlv(_ISIS_GenericTlv_Base):
name = "ISIS Generic Sub-TLV"
#######################################################################
# ISIS Sub-TLVs for TLVs 22, 23, 141, 222, 223 #
#######################################################################
_isis_subtlv_classes_1 = {
3: "ISIS_AdministrativeGroupSubTlv",
4: "ISIS_LinkLocalRemoteIdentifiersSubTlv",
6: "ISIS_IPv4InterfaceAddressSubTlv",
8: "ISIS_IPv4NeighborAddressSubTlv",
9: "ISIS_MaximumLinkBandwidthSubTlv",
10: "ISIS_MaximumReservableLinkBandwidthSubTlv",
11: "ISIS_UnreservedBandwidthSubTlv",
12: "ISIS_IPv6InterfaceAddressSubTlv",
13: "ISIS_IPv6NeighborAddressSubTlv",
18: "ISIS_TEDefaultMetricSubTlv"
}
_isis_subtlv_names_1 = {
3: "Administrative Group (Color)",
4: "Link Local/Remote Identifiers",
6: "IPv4 Interface Address",
8: "IPv4 Neighbor Address",
9: "Maximum Link Bandwidth",
10: "Maximum Reservable Link Bandwidth",
11: "Unreserved Bandwidth",
12: "IPv6 Interface Address",
13: "IPv6 Neighbor Address",
18: "TE Default Metric"
}
def _ISIS_GuessSubTlvClass_1(p, **kargs):
return _ISIS_GuessTlvClass_Helper(_isis_subtlv_classes_1, "ISIS_GenericSubTlv", p, **kargs) # noqa: E501
class ISIS_IPv4InterfaceAddressSubTlv(ISIS_GenericSubTlv):
name = "ISIS IPv4 Interface Address (S)"
fields_desc = [ByteEnumField("type", 6, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="address", fmt="B"),
IPField("address", "0.0.0.0")]
class ISIS_IPv4NeighborAddressSubTlv(ISIS_GenericSubTlv):
name = "ISIS IPv4 Neighbor Address (S)"
fields_desc = [ByteEnumField("type", 8, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="address", fmt="B"),
IPField("address", "0.0.0.0")]
class ISIS_LinkLocalRemoteIdentifiersSubTlv(ISIS_GenericSubTlv):
name = "ISIS Link Local/Remote Identifiers (S)"
fields_desc = [ByteEnumField("type", 4, _isis_subtlv_names_1),
FieldLenField("len", 8, fmt="B"),
IntField("localid", "0"),
IntField("remoteid", "0")]
class ISIS_IPv6InterfaceAddressSubTlv(ISIS_GenericSubTlv):
name = "ISIS IPv6 Interface Address (S)"
fields_desc = [ByteEnumField("type", 12, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="address", fmt="B"),
IP6Field("address", "::")]
class ISIS_IPv6NeighborAddressSubTlv(ISIS_GenericSubTlv):
name = "ISIS IPv6 Neighbor Address (S)"
fields_desc = [ByteEnumField("type", 13, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="address", fmt="B"),
IP6Field("address", "::")]
class ISIS_AdministrativeGroupSubTlv(ISIS_GenericSubTlv):
name = "Administrative Group SubTLV (Color)"
fields_desc = [ByteEnumField("code", 3, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="admingroup", fmt="B"),
IPField("admingroup", "0.0.0.1")]
class ISIS_MaximumLinkBandwidthSubTlv(ISIS_GenericSubTlv):
name = "Maximum Link Bandwidth SubTLV"
fields_desc = [ByteEnumField("type", 9, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="maxbw", fmt="B"),
IEEEFloatField("maxbw", 1000)] # in B/s
class ISIS_MaximumReservableLinkBandwidthSubTlv(ISIS_GenericSubTlv):
name = "Maximum Reservable Link Bandwidth SubTLV"
fields_desc = [ByteEnumField("type", 10, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="maxrsvbw", fmt="B"),
IEEEFloatField("maxrsvbw", 1000)] # in B/s
class ISIS_UnreservedBandwidthSubTlv(ISIS_GenericSubTlv):
name = "Unreserved Bandwidth SubTLV"
fields_desc = [ByteEnumField("type", 11, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="unrsvbw", fmt="B"),
FieldListField("unrsvbw", [1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000], IEEEFloatField("", 1000), count_from=lambda pkt: pkt.len / 4)] # in B/s # noqa: E501
class ISIS_TEDefaultMetricSubTlv(ISIS_GenericSubTlv):
name = "TE Default Metric SubTLV"
fields_desc = [ByteEnumField("type", 18, _isis_subtlv_names_1),
FieldLenField("len", None, length_of="temetric", adjust=lambda pkt, x:x - 1, fmt="B"), # noqa: E501
ThreeBytesField("temetric", 1000)]
#######################################################################
# ISIS Sub-TLVs for TLVs 135, 235, 236, and 237 #
#######################################################################
_isis_subtlv_classes_2 = {
1: "ISIS_32bitAdministrativeTagSubTlv",
2: "ISIS_64bitAdministrativeTagSubTlv"
}
_isis_subtlv_names_2 = {
1: "32-bit Administrative Tag",
2: "64-bit Administrative Tag"
}
def _ISIS_GuessSubTlvClass_2(p, **kargs):
return _ISIS_GuessTlvClass_Helper(_isis_subtlv_classes_2, "ISIS_GenericSubTlv", p, **kargs) # noqa: E501
class ISIS_32bitAdministrativeTagSubTlv(ISIS_GenericSubTlv):
name = "ISIS 32-bit Administrative Tag (S)"
fields_desc = [ByteEnumField("type", 1, _isis_subtlv_names_2),
FieldLenField("len", None, length_of="tags", fmt="B"),
FieldListField("tags", [], IntField("", 0), count_from=lambda pkt: pkt.len // 4)] # noqa: E501
class ISIS_64bitAdministrativeTagSubTlv(ISIS_GenericSubTlv):
name = "ISIS 64-bit Administrative Tag (S)"
fields_desc = [ByteEnumField("type", 2, _isis_subtlv_names_2),
FieldLenField("len", None, length_of="tags", fmt="B"),
FieldListField("tags", [], LongField("", 0), count_from=lambda pkt: pkt.len // 8)] # noqa: E501
#######################################################################
# ISIS TLVs #
#######################################################################
_isis_tlv_classes = {
1: "ISIS_AreaTlv",
2: "ISIS_IsReachabilityTlv",
6: "ISIS_IsNeighbourTlv",
8: "ISIS_PaddingTlv",
9: "ISIS_LspEntryTlv",
10: "ISIS_AuthenticationTlv",
12: "ISIS_ChecksumTlv",
14: "ISIS_BufferSizeTlv",
22: "ISIS_ExtendedIsReachabilityTlv",
128: "ISIS_InternalIpReachabilityTlv",
129: "ISIS_ProtocolsSupportedTlv",
130: "ISIS_ExternalIpReachabilityTlv",
132: "ISIS_IpInterfaceAddressTlv",
135: "ISIS_ExtendedIpReachabilityTlv",
137: "ISIS_DynamicHostnameTlv",
232: "ISIS_Ipv6InterfaceAddressTlv",
236: "ISIS_Ipv6ReachabilityTlv",
240: "ISIS_P2PAdjacencyStateTlv"
}
_isis_tlv_names = {
1: "Area TLV",
2: "IS Reachability TLV",
6: "IS Neighbour TLV",
7: "Instance Identifier TLV",
8: "Padding TLV",
9: "LSP Entries TLV",
10: "Authentication TLV",
12: "Optional Checksum TLV",
13: "Purge Originator Identification TLV",
14: "LSP Buffer Size TLV",
22: "Extended IS-Reachability TLV",
23: "IS Neighbour Attribute TLV",
24: "IS Alias ID",
128: "IP Internal Reachability TLV",
129: "Protocols Supported TLV",
130: "IP External Reachability TLV",
131: "Inter-Domain Routing Protocol Information TLV",
132: "IP Interface Address TLV",
134: "Traffic Engineering Router ID TLV",
135: "Extended IP Reachability TLV",
137: "Dynamic Hostname TLV",
138: "GMPLS Shared Risk Link Group TLV",
139: "IPv6 Shared Risk Link Group TLV",
140: "IPv6 Traffic Engineering Router ID TLV",
141: "Inter-AS Reachability Information TLV",
142: "Group Address TLV",
143: "Multi-Topology-Aware Port Capability TLV",
144: "Multi-Topology Capability TLV",
145: "TRILL Neighbour TLV",
147: "MAC-Reachability TLV",
148: "BFD-Enabled TLV",
211: "Restart TLV",
222: "Multi-Topology Intermediate Systems TLV",
223: "Multi-Topology IS Neighbour Attributes TLV",
229: "Multi-Topology TLV",
232: "IPv6 Interface Address TLV",
233: "IPv6 Global Interface Address TLV",
235: "Multi-Topology IPv4 Reachability TLV",
236: "IPv6 Reachability TLV",
237: "Multi-Topology IPv6 Reachability TLV",
240: "Point-to-Point Three-Way Adjacency TLV",
242: "IS-IS Router Capability TLV",
251: "Generic Information TLV"
}
def _ISIS_GuessTlvClass(p, **kargs):
return _ISIS_GuessTlvClass_Helper(_isis_tlv_classes, "ISIS_GenericTlv", p, **kargs) # noqa: E501
class ISIS_AreaEntry(Packet):
name = "ISIS Area Entry"
fields_desc = [FieldLenField("arealen", None, length_of="areaid", fmt="B"),
ISIS_AreaIdField("areaid", "49", length_from=lambda pkt: pkt.arealen)] # noqa: E501
def extract_padding(self, s):
return "", s
class ISIS_AreaTlv(ISIS_GenericTlv):
name = "ISIS Area TLV"
fields_desc = [ByteEnumField("type", 1, _isis_tlv_names),
FieldLenField("len", None, length_of="areas", fmt="B"),
PacketListField("areas", [], ISIS_AreaEntry, length_from=lambda x: x.len)] # noqa: E501
class ISIS_AuthenticationTlv(ISIS_GenericTlv):
name = "ISIS Authentication TLV"
fields_desc = [ByteEnumField("type", 10, _isis_tlv_names),
FieldLenField("len", None, length_of="password", adjust=lambda pkt, x: x + 1, fmt="B"), # noqa: E501
ByteEnumField("authtype", 1, {1: "Plain", 17: "HMAC-MD5"}),
BoundStrLenField("password", "", maxlen=254, length_from=lambda pkt: pkt.len - 1)] # noqa: E501
class ISIS_BufferSizeTlv(ISIS_GenericTlv):
name = "ISIS Buffer Size TLV"
fields_desc = [ByteEnumField("type", 14, _isis_tlv_names),
ByteField("len", 2),
ShortField("lspbuffersize", 1497)]
class ISIS_ChecksumTlv(ISIS_GenericTlv):
name = "ISIS Optional Checksum TLV"
fields_desc = [ByteEnumField("type", 12, _isis_tlv_names),
ByteField("len", 2),
XShortField("checksum", None)]
class ISIS_DynamicHostnameTlv(ISIS_GenericTlv):
name = "ISIS Dynamic Hostname TLV"
fields_desc = [ByteEnumField("type", 137, _isis_tlv_names),
FieldLenField("len", None, length_of="hostname", fmt="B"),
BoundStrLenField("hostname", "", length_from=lambda pkt: pkt.len)] # noqa: E501
class ISIS_ExtendedIpPrefix(Packet):
name = "ISIS Extended IP Prefix"
fields_desc = [
IntField("metric", 1),
BitField("updown", 0, 1),
BitField("subtlvindicator", 0, 1),
BitFieldLenField("pfxlen", None, 6, length_of="pfx"),
IPPrefixField("pfx", None, wordbytes=1, length_from=lambda x: x.pfxlen), # noqa: E501
ConditionalField(FieldLenField("subtlvslen", None, length_of="subtlvs", fmt="B"), lambda pkt: pkt.subtlvindicator == 1), # noqa: E501
ConditionalField(PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_2, length_from=lambda x: x.subtlvslen), lambda pkt: pkt.subtlvindicator == 1) # noqa: E501
]
def extract_padding(self, s):
return "", s
class ISIS_TERouterIDTlv(ISIS_GenericTlv):
name = "ISIS TE Router ID TLV"
fields_desc = [ByteEnumField("type", 134, _isis_tlv_names),
FieldLenField("len", None, length_of="routerid", fmt="B"),
IPField("routerid", "0.0.0.0")]
class ISIS_ExtendedIpReachabilityTlv(ISIS_GenericTlv):
name = "ISIS Extended IP Reachability TLV"
fields_desc = [ByteEnumField("type", 135, _isis_tlv_names),
FieldLenField("len", None, length_of="pfxs", fmt="B"),
PacketListField("pfxs", [], ISIS_ExtendedIpPrefix, length_from=lambda pkt: pkt.len)] # noqa: E501
class ISIS_ExtendedIsNeighbourEntry(Packet):
name = "ISIS Extended IS Neighbour Entry"
fields_desc = [
ISIS_NodeIdField("neighbourid", "0102.0304.0506.07"),
ThreeBytesField("metric", 1),
FieldLenField("subtlvslen", None, length_of="subtlvs", fmt="B"),
PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_1, length_from=lambda x: x.subtlvslen) # noqa: E501
]
def extract_padding(self, s):
return "", s
class ISIS_ExtendedIsReachabilityTlv(ISIS_GenericTlv):
name = "ISIS Extended IS Reachability TLV"
fields_desc = [ByteEnumField("type", 22, _isis_tlv_names),
FieldLenField("len", None, length_of="neighbours", fmt="B"),
PacketListField("neighbours", [], ISIS_ExtendedIsNeighbourEntry, length_from=lambda x: x.len)] # noqa: E501
class ISIS_IpInterfaceAddressTlv(ISIS_GenericTlv):
name = "ISIS IP Interface Address TLV"
fields_desc = [ByteEnumField("type", 132, _isis_tlv_names),
FieldLenField("len", None, length_of="addresses", fmt="B"),
FieldListField("addresses", [], IPField("", "0.0.0.0"), count_from=lambda pkt: pkt.len // 4)] # noqa: E501
class ISIS_Ipv6InterfaceAddressTlv(ISIS_GenericTlv):
name = "ISIS IPv6 Interface Address TLV"
fields_desc = [
ByteEnumField("type", 232, _isis_tlv_names),
FieldLenField("len", None, length_of="addresses", fmt="B"),
IP6ListField("addresses", [], count_from=lambda pkt: pkt.len // 16)
]
class ISIS_Ipv6Prefix(Packet):
name = "ISIS IPv6 Prefix"
fields_desc = [
IntField("metric", 1),
BitField("updown", 0, 1),
BitField("external", 0, 1),
BitField("subtlvindicator", 0, 1),
BitField("reserved", 0, 5),
FieldLenField("pfxlen", None, length_of="pfx", fmt="B"),
IP6PrefixField("pfx", None, wordbytes=1, length_from=lambda x: x.pfxlen), # noqa: E501
ConditionalField(FieldLenField("subtlvslen", None, length_of="subtlvs", fmt="B"), lambda pkt: pkt.subtlvindicator == 1), # noqa: E501
ConditionalField(PacketListField("subtlvs", [], _ISIS_GuessSubTlvClass_2, length_from=lambda x: x.subtlvslen), lambda pkt: pkt.subtlvindicator == 1) # noqa: E501
]
def extract_padding(self, s):
return "", s
class ISIS_Ipv6ReachabilityTlv(ISIS_GenericTlv):
name = "ISIS IPv6 Reachability TLV"
fields_desc = [ByteEnumField("type", 236, _isis_tlv_names),
FieldLenField("len", None, length_of="pfxs", fmt="B"),
PacketListField("pfxs", [], ISIS_Ipv6Prefix, length_from=lambda pkt: pkt.len)] # noqa: E501
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)] # noqa: E501
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) # noqa: E501
]
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"}), # noqa: E501
ConditionalField(IntField("extlocalcircuitid", None), lambda pkt: pkt.len >= 5), # noqa: E501
ConditionalField(ISIS_SystemIdField("neighboursystemid", None), lambda pkt: pkt.len >= 11), # noqa: E501
ConditionalField(IntField("neighbourextlocalcircuitid", None), lambda pkt: pkt.len == 15)] # noqa: E501
# 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) # noqa: E501
]
#######################################################################
# 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) # noqa: E501
]
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) # noqa: E501
]
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), # noqa: E501
ByteField("virtual", 0),
PacketListField("neighbours", [], ISIS_IsReachabilityEntry, count_from=lambda x: (x.len - 1) // 11) # noqa: E501
]
#######################################################################
# 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) # noqa: E501
class _ISIS_TlvListField(PacketListField):
def __init__(self):
PacketListField.__init__(self, "tlvs", [], _ISIS_GuessTlvClass, length_from=lambda pkt: pkt.pdulength - pkt.underlayer.hdrlen) # noqa: E501
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"]), # noqa: E501
_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)
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