# SPDX-License-Identifier: GPL-2.0-or-later # This file is part of Scapy # See https://scapy.net/ for more information # scapy.contrib.description = Link Layer Discovery Protocol (LLDP) # scapy.contrib.status = loads """ LLDP - Link Layer Discovery Protocol ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :author: Thomas Tannhaeuser, hecke@naberius.de :description: This module provides Scapy layers for the LLDP protocol. normative references: - IEEE 802.1AB 2016 - LLDP protocol, topology and MIB description :TODO: - | organization specific TLV e.g. ProfiNet | (see LLDPDUGenericOrganisationSpecific for a starting point) - Ignore everything after EndofLLDPDUTLV :NOTES: - you can find the layer configuration options at the end of this file - default configuration enforces standard conform: * | frame structure | (ChassisIDTLV/PortIDTLV/TimeToLiveTLV/...) * multiplicity of TLVs (if given by the standard) * min sizes of strings used by the TLVs - conf.contribs['LLDP'].strict_mode_disable() -> disable strict mode """ from scapy.config import conf from scapy.error import Scapy_Exception from scapy.layers.l2 import Ether, Dot1Q from scapy.fields import MACField, IPField, IP6Field, BitField, \ StrLenField, ByteEnumField, BitEnumField, \ EnumField, ThreeBytesField, BitFieldLenField, \ ShortField, XStrLenField, ByteField, ConditionalField, \ MultipleTypeField from scapy.packet import Packet, bind_layers from scapy.data import ETHER_TYPES from scapy.compat import orb LLDP_NEAREST_BRIDGE_MAC = '01:80:c2:00:00:0e' LLDP_NEAREST_NON_TPMR_BRIDGE_MAC = '01:80:c2:00:00:03' LLDP_NEAREST_CUSTOMER_BRIDGE_MAC = '01:80:c2:00:00:00' LLDP_ETHER_TYPE = 0x88cc ETHER_TYPES[LLDP_ETHER_TYPE] = 'LLDP' class LLDPInvalidFrameStructure(Scapy_Exception): """ basic frame structure not standard conform (missing TLV, invalid order or multiplicity) """ pass class LLDPMissingLowerLayer(Scapy_Exception): """ first layer below first LLDPDU must be Ethernet or Dot1q """ pass class LLDPInvalidTLVCount(Scapy_Exception): """ invalid number of entries for a specific TLV type """ pass class LLDPInvalidLengthField(Scapy_Exception): """ invalid value of length field """ pass class LLDPDU(Packet): """ base class for all LLDP data units """ TYPES = { 0x00: 'end of LLDPDU', 0x01: 'chassis id', 0x02: 'port id', 0x03: 'time to live', 0x04: 'port description', 0x05: 'system name', 0x06: 'system description', 0x07: 'system capabilities', 0x08: 'management address', 127: 'organisation specific TLV' } IANA_ADDRESS_FAMILY_NUMBERS = { 0x00: 'other', 0x01: 'IPv4', 0x02: 'IPv6', 0x03: 'NSAP', 0x04: 'HDLC', 0x05: 'BBN', 0x06: '802', 0x07: 'E.163', 0x08: 'E.164', 0x09: 'F.69', 0x0a: 'X.121', 0x0b: 'IPX', 0x0c: 'Appletalk', 0x0d: 'Decnet IV', 0x0e: 'Banyan Vines', 0x0f: 'E.164 with NSAP', 0x10: 'DNS', 0x11: 'Distinguished Name', 0x12: 'AS Number', 0x13: 'XTP over IPv4', 0x14: 'XTP over IPv6', 0x15: 'XTP native mode XTP', 0x16: 'Fiber Channel World-Wide Port Name', 0x17: 'Fiber Channel World-Wide Node Name', 0x18: 'GWID', 0x19: 'AFI for L2VPN', 0x1a: 'MPLS-TP Section Endpoint ID', 0x1b: 'MPLS-TP LSP Endpoint ID', 0x1c: 'MPLS-TP Pseudowire Endpoint ID', 0x1d: 'MT IP Multi-Topology IPv4', 0x1e: 'MT IP Multi-Topology IPv6' } DOT1Q_HEADER_LEN = 4 ETHER_HEADER_LEN = 14 ETHER_FSC_LEN = 4 ETHER_FRAME_MIN_LEN = 64 LAYER_STACK = [] LAYER_MULTIPLICITIES = {} def guess_payload_class(self, payload): # type is a 7-bit bitfield spanning bits 1..7 -> div 2 try: lldpdu_tlv_type = orb(payload[0]) // 2 return LLDPDU_CLASS_TYPES.get(lldpdu_tlv_type, conf.raw_layer) except IndexError: return conf.raw_layer @staticmethod def _dot1q_headers_size(layer): """ calculate size of lower dot1q layers (if present) :param layer: the layer to start at :return: size of vlan headers, layer below lowest vlan header """ vlan_headers_size = 0 under_layer = layer while under_layer and isinstance(under_layer, Dot1Q): vlan_headers_size += LLDPDU.DOT1Q_HEADER_LEN under_layer = under_layer.underlayer return vlan_headers_size, under_layer def post_build(self, pkt, pay): under_layer = self.underlayer if under_layer is None: if conf.contribs['LLDP'].strict_mode(): raise LLDPMissingLowerLayer('No lower layer (Ethernet ' 'or Dot1Q) provided.') else: return pkt + pay if isinstance(under_layer, LLDPDU): return pkt + pay frame_size, under_layer = LLDPDU._dot1q_headers_size(under_layer) if not under_layer or not isinstance(under_layer, Ether): if conf.contribs['LLDP'].strict_mode(): raise LLDPMissingLowerLayer('No Ethernet layer provided.') else: return pkt + pay frame_size += LLDPDU.ETHER_HEADER_LEN frame_size += len(pkt) + len(pay) + LLDPDU.ETHER_FSC_LEN if frame_size < LLDPDU.ETHER_FRAME_MIN_LEN: return pkt + pay + b'\x00' * (LLDPDU.ETHER_FRAME_MIN_LEN - frame_size) # noqa: E501 return pkt + pay @staticmethod def _frame_structure_check(structure_description): """ check if the structure of the frame is conform to the basic frame structure defined by the standard :param structure_description: string-list reflecting LLDP-msg structure """ standard_frame_structure = [LLDPDUChassisID.__name__, LLDPDUPortID.__name__, LLDPDUTimeToLive.__name__, '<...>'] if len(structure_description) < 3: raise LLDPInvalidFrameStructure( 'Invalid frame structure.\ngot: {}\nexpected: ' '{}'.format(' '.join(structure_description), ' '.join(standard_frame_structure))) for idx, layer_name in enumerate(standard_frame_structure): if layer_name == '<...>': break if layer_name != structure_description[idx]: raise LLDPInvalidFrameStructure( 'Invalid frame structure.\ngot: {}\nexpected: ' '{}'.format(' '.join(structure_description), ' '.join(standard_frame_structure))) @staticmethod def _tlv_multiplicities_check(tlv_type_count): """ check if multiplicity of present TLVs conforms to the standard :param tlv_type_count: dict containing counte-per-TLV """ # * : 0..n, 1 : one and only one. standard_multiplicities = { LLDPDUEndOfLLDPDU.__name__: '*', LLDPDUChassisID.__name__: 1, LLDPDUPortID.__name__: 1, LLDPDUTimeToLive.__name__: 1, LLDPDUPortDescription: '*', LLDPDUSystemName: '*', LLDPDUSystemDescription: '*', LLDPDUSystemCapabilities: '*', LLDPDUManagementAddress: '*' } for tlv_type_name in standard_multiplicities: standard_tlv_multiplicity = \ standard_multiplicities[tlv_type_name] if standard_tlv_multiplicity == '*': continue try: if tlv_type_count[tlv_type_name] != standard_tlv_multiplicity: raise LLDPInvalidTLVCount( 'Invalid number of entries for TLV type ' '{} - expected {} entries, got ' '{}'.format(tlv_type_name, standard_tlv_multiplicity, tlv_type_count[tlv_type_name])) except KeyError: raise LLDPInvalidTLVCount('Missing TLV layer of type ' '{}.'.format(tlv_type_name)) def pre_dissect(self, s): if conf.contribs['LLDP'].strict_mode(): if self.__class__.__name__ == 'LLDPDU': LLDPDU.LAYER_STACK = [] LLDPDU.LAYER_MULTIPLICITIES = {} else: LLDPDU.LAYER_STACK.append(self.__class__.__name__) try: LLDPDU.LAYER_MULTIPLICITIES[self.__class__.__name__] += 1 except KeyError: LLDPDU.LAYER_MULTIPLICITIES[self.__class__.__name__] = 1 return s def dissection_done(self, pkt): if self.__class__.__name__ == 'LLDPDU' and \ conf.contribs['LLDP'].strict_mode(): LLDPDU._frame_structure_check(LLDPDU.LAYER_STACK) LLDPDU._tlv_multiplicities_check(LLDPDU.LAYER_MULTIPLICITIES) super(LLDPDU, self).dissection_done(pkt) def _check(self): """Overwritten by LLDPU objects""" pass def post_dissect(self, s): self._check() return super(LLDPDU, self).post_dissect(s) def do_build(self): self._check() return super(LLDPDU, self).do_build() def _ldp_id_adjustlen(pkt, x): """Return the length of the `id` field, according to its real encoded type""" f, v = pkt.getfield_and_val('id') length = f.i2len(pkt, v) + 1 if (isinstance(pkt, LLDPDUPortID) and pkt.subtype == 0x4) or \ (isinstance(pkt, LLDPDUChassisID) and pkt.subtype == 0x5): # Take the ConditionalField into account length += 1 return length def _ldp_id_lengthfrom(pkt): length = pkt._length if length is None: return 0 # Subtract the subtype field length -= 1 if (isinstance(pkt, LLDPDUPortID) and pkt.subtype == 0x4) or \ (isinstance(pkt, LLDPDUChassisID) and pkt.subtype == 0x5): # Take the ConditionalField into account length -= 1 return length class LLDPDUChassisID(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.2 / p. 26 """ LLDP_CHASSIS_ID_TLV_SUBTYPES = { 0x00: 'reserved', 0x01: 'chassis component', 0x02: 'interface alias', 0x03: 'port component', 0x04: 'MAC address', 0x05: 'network address', 0x06: 'interface name', 0x07: 'locally assigned', } SUBTYPE_RESERVED = 0x00 SUBTYPE_CHASSIS_COMPONENT = 0x01 SUBTYPE_INTERFACE_ALIAS = 0x02 SUBTYPE_PORT_COMPONENT = 0x03 SUBTYPE_MAC_ADDRESS = 0x04 SUBTYPE_NETWORK_ADDRESS = 0x05 SUBTYPE_INTERFACE_NAME = 0x06 SUBTYPE_LOCALLY_ASSIGNED = 0x07 fields_desc = [ BitEnumField('_type', 0x01, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='id', adjust=lambda pkt, x: _ldp_id_adjustlen(pkt, x)), ByteEnumField('subtype', 0x00, LLDP_CHASSIS_ID_TLV_SUBTYPES), ConditionalField( ByteEnumField('family', 0, LLDPDU.IANA_ADDRESS_FAMILY_NUMBERS), lambda pkt: pkt.subtype == 0x05 ), MultipleTypeField([ ( MACField('id', None), lambda pkt: pkt.subtype == 0x04 ), ( IPField('id', None), lambda pkt: pkt.subtype == 0x05 and pkt.family == 0x01 ), ( IP6Field('id', None), lambda pkt: pkt.subtype == 0x05 and pkt.family == 0x02 ), ], StrLenField('id', '', length_from=_ldp_id_lengthfrom) ) ] def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode() and not self.id: raise LLDPInvalidLengthField('id must be >= 1 characters long') class LLDPDUPortID(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.3 / p. 26 """ LLDP_PORT_ID_TLV_SUBTYPES = { 0x00: 'reserved', 0x01: 'interface alias', 0x02: 'port component', 0x03: 'MAC address', 0x04: 'network address', 0x05: 'interface name', 0x06: 'agent circuit ID', 0x07: 'locally assigned', } SUBTYPE_RESERVED = 0x00 SUBTYPE_INTERFACE_ALIAS = 0x01 SUBTYPE_PORT_COMPONENT = 0x02 SUBTYPE_MAC_ADDRESS = 0x03 SUBTYPE_NETWORK_ADDRESS = 0x04 SUBTYPE_INTERFACE_NAME = 0x05 SUBTYPE_AGENT_CIRCUIT_ID = 0x06 SUBTYPE_LOCALLY_ASSIGNED = 0x07 fields_desc = [ BitEnumField('_type', 0x02, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='id', adjust=lambda pkt, x: _ldp_id_adjustlen(pkt, x)), ByteEnumField('subtype', 0x00, LLDP_PORT_ID_TLV_SUBTYPES), ConditionalField( ByteEnumField('family', 0, LLDPDU.IANA_ADDRESS_FAMILY_NUMBERS), lambda pkt: pkt.subtype == 0x04 ), MultipleTypeField([ ( MACField('id', None), lambda pkt: pkt.subtype == 0x03 ), ( IPField('id', None), lambda pkt: pkt.subtype == 0x04 and pkt.family == 0x01 ), ( IP6Field('id', None), lambda pkt: pkt.subtype == 0x04 and pkt.family == 0x02 ), ], StrLenField('id', '', length_from=_ldp_id_lengthfrom) ) ] def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode() and not self.id: raise LLDPInvalidLengthField('id must be >= 1 characters long') class LLDPDUTimeToLive(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.4 / p. 29 """ fields_desc = [ BitEnumField('_type', 0x03, 7, LLDPDU.TYPES), BitField('_length', 0x02, 9), ShortField('ttl', 20) ] def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode() and self._length != 2: raise LLDPInvalidLengthField('length must be 2 - got ' '{}'.format(self._length)) class LLDPDUEndOfLLDPDU(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.1 / p. 26 """ fields_desc = [ BitEnumField('_type', 0x00, 7, LLDPDU.TYPES), BitField('_length', 0x00, 9), ] def extract_padding(self, s): return '', s def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode() and self._length != 0: raise LLDPInvalidLengthField('length must be 0 - got ' '{}'.format(self._length)) class LLDPDUPortDescription(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.5 / p. 29 """ fields_desc = [ BitEnumField('_type', 0x04, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='description'), StrLenField('description', '', length_from=lambda pkt: pkt._length) ] class LLDPDUSystemName(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.6 / p. 30 """ fields_desc = [ BitEnumField('_type', 0x05, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='system_name'), StrLenField('system_name', '', length_from=lambda pkt: pkt._length) ] class LLDPDUSystemDescription(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.7 / p. 31 """ fields_desc = [ BitEnumField('_type', 0x06, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='description'), StrLenField('description', '', length_from=lambda pkt: pkt._length) ] class LLDPDUSystemCapabilities(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.8 / p. 31 """ fields_desc = [ BitEnumField('_type', 0x07, 7, LLDPDU.TYPES), BitFieldLenField('_length', 4, 9), BitField('reserved_5_available', 0, 1), BitField('reserved_4_available', 0, 1), BitField('reserved_3_available', 0, 1), BitField('reserved_2_available', 0, 1), BitField('reserved_1_available', 0, 1), BitField('two_port_mac_relay_available', 0, 1), BitField('s_vlan_component_available', 0, 1), BitField('c_vlan_component_available', 0, 1), BitField('station_only_available', 0, 1), BitField('docsis_cable_device_available', 0, 1), BitField('telephone_available', 0, 1), BitField('router_available', 0, 1), BitField('wlan_access_point_available', 0, 1), BitField('mac_bridge_available', 0, 1), BitField('repeater_available', 0, 1), BitField('other_available', 0, 1), BitField('reserved_5_enabled', 0, 1), BitField('reserved_4_enabled', 0, 1), BitField('reserved_3_enabled', 0, 1), BitField('reserved_2_enabled', 0, 1), BitField('reserved_1_enabled', 0, 1), BitField('two_port_mac_relay_enabled', 0, 1), BitField('s_vlan_component_enabled', 0, 1), BitField('c_vlan_component_enabled', 0, 1), BitField('station_only_enabled', 0, 1), BitField('docsis_cable_device_enabled', 0, 1), BitField('telephone_enabled', 0, 1), BitField('router_enabled', 0, 1), BitField('wlan_access_point_enabled', 0, 1), BitField('mac_bridge_enabled', 0, 1), BitField('repeater_enabled', 0, 1), BitField('other_enabled', 0, 1), ] def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode() and self._length != 4: raise LLDPInvalidLengthField('length must be 4 - got ' '{}'.format(self._length)) class LLDPDUManagementAddress(LLDPDU): """ ieee 802.1ab-2016 - sec. 8.5.9 / p. 32 currently only 0x00..0x1e are used by standards, no way to use anything > 0xff as management address subtype is only one octet wide see https://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml # noqa: E501 """ SUBTYPE_MANAGEMENT_ADDRESS_OTHER = 0x00 SUBTYPE_MANAGEMENT_ADDRESS_IPV4 = 0x01 SUBTYPE_MANAGEMENT_ADDRESS_IPV6 = 0x02 SUBTYPE_MANAGEMENT_ADDRESS_NSAP = 0x03 SUBTYPE_MANAGEMENT_ADDRESS_HDLC = 0x04 SUBTYPE_MANAGEMENT_ADDRESS_BBN = 0x05 SUBTYPE_MANAGEMENT_ADDRESS_802 = 0x06 SUBTYPE_MANAGEMENT_ADDRESS_E_163 = 0x07 SUBTYPE_MANAGEMENT_ADDRESS_E_164 = 0x08 SUBTYPE_MANAGEMENT_ADDRESS_F_69 = 0x09 SUBTYPE_MANAGEMENT_ADDRESS_X_121 = 0x0A SUBTYPE_MANAGEMENT_ADDRESS_IPX = 0x0B SUBTYPE_MANAGEMENT_ADDRESS_APPLETALK = 0x0C SUBTYPE_MANAGEMENT_ADDRESS_DECNET_IV = 0x0D SUBTYPE_MANAGEMENT_ADDRESS_BANYAN_VINES = 0x0E SUBTYPE_MANAGEMENT_ADDRESS_E_164_WITH_NSAP = 0x0F SUBTYPE_MANAGEMENT_ADDRESS_DNS = 0x10 SUBTYPE_MANAGEMENT_ADDRESS_DISTINGUISHED_NAME = 0x11 SUBTYPE_MANAGEMENT_ADDRESS_AS_NUMBER = 0x12 SUBTYPE_MANAGEMENT_ADDRESS_XTP_OVER_IPV4 = 0x13 SUBTYPE_MANAGEMENT_ADDRESS_XTP_OVER_IPV6 = 0x14 SUBTYPE_MANAGEMENT_ADDRESS_XTP_NATIVE_MODE_XTP = 0x15 SUBTYPE_MANAGEMENT_ADDRESS_FIBER_CHANNEL_WORLD_WIDE_PORT_NAME = 0x16 SUBTYPE_MANAGEMENT_ADDRESS_FIBER_CHANNEL_WORLD_WIDE_NODE_NAME = 0x17 SUBTYPE_MANAGEMENT_ADDRESS_GWID = 0x18 SUBTYPE_MANAGEMENT_ADDRESS_AFI_FOR_L2VPN = 0x19 SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_SECTION_ENDPOINT_ID = 0x1A SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_LSP_ENDPOINT_ID = 0x1B SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_PSEUDOWIRE_ENDPOINT_ID = 0x1C SUBTYPE_MANAGEMENT_ADDRESS_MT_IP_MULTI_TOPOLOGY_IPV4 = 0x1D SUBTYPE_MANAGEMENT_ADDRESS_MT_IP_MULTI_TOPOLOGY_IPV6 = 0x1E INTERFACE_NUMBERING_SUBTYPES = { 0x01: 'unknown', 0x02: 'ifIndex', 0x03: 'system port number' } SUBTYPE_INTERFACE_NUMBER_UNKNOWN = 0x01 SUBTYPE_INTERFACE_NUMBER_IF_INDEX = 0x02 SUBTYPE_INTERFACE_NUMBER_SYSTEM_PORT_NUMBER = 0x03 ''' Note - calculation of _length field:: _length = 1@_management_address_string_length + 1@management_address_subtype + management_address.len + 1@interface_numbering_subtype + 4@interface_number + 1@_oid_string_length + object_id.len ''' fields_desc = [ BitEnumField('_type', 0x08, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='management_address', adjust=lambda pkt, x: 8 + len(pkt.management_address) + len(pkt.object_id)), BitFieldLenField('_management_address_string_length', None, 8, length_of='management_address', adjust=lambda pkt, x: len(pkt.management_address) + 1), # noqa: E501 ByteEnumField('management_address_subtype', 0x00, LLDPDU.IANA_ADDRESS_FAMILY_NUMBERS), XStrLenField('management_address', '', length_from=lambda pkt: 0 if pkt._management_address_string_length is None else pkt._management_address_string_length - 1), ByteEnumField('interface_numbering_subtype', SUBTYPE_INTERFACE_NUMBER_UNKNOWN, INTERFACE_NUMBERING_SUBTYPES), BitField('interface_number', 0, 32), BitFieldLenField('_oid_string_length', None, 8, length_of='object_id'), XStrLenField('object_id', '', length_from=lambda pkt: pkt._oid_string_length), ] def _check(self): """ run layer specific checks """ if conf.contribs['LLDP'].strict_mode(): management_address_len = len(self.management_address) if management_address_len == 0 or management_address_len > 31: raise LLDPInvalidLengthField( 'management address must be 1..31 characters long - ' 'got string of size {}'.format(management_address_len)) class ThreeBytesEnumField(EnumField, ThreeBytesField): def __init__(self, name, default, enum): EnumField.__init__(self, name, default, enum, "!I") class LLDPDUGenericOrganisationSpecific(LLDPDU): ORG_UNIQUE_CODE_PNO = 0x000ecf ORG_UNIQUE_CODE_IEEE_802_1 = 0x0080c2 ORG_UNIQUE_CODE_IEEE_802_3 = 0x00120f ORG_UNIQUE_CODE_TIA_TR_41_MED = 0x0012bb ORG_UNIQUE_CODE_HYTEC = 0x30b216 ORG_UNIQUE_CODES = { ORG_UNIQUE_CODE_PNO: "PROFIBUS International (PNO)", ORG_UNIQUE_CODE_IEEE_802_1: "IEEE 802.1", ORG_UNIQUE_CODE_IEEE_802_3: "IEEE 802.3", ORG_UNIQUE_CODE_TIA_TR_41_MED: "TIA TR-41 Committee . Media Endpoint Discovery", # noqa: E501 ORG_UNIQUE_CODE_HYTEC: "Hytec Geraetebau GmbH" } fields_desc = [ BitEnumField('_type', 127, 7, LLDPDU.TYPES), BitFieldLenField('_length', None, 9, length_of='data', adjust=lambda pkt, x: len(pkt.data) + 4), # noqa: E501 ThreeBytesEnumField('org_code', 0, ORG_UNIQUE_CODES), ByteField('subtype', 0x00), XStrLenField('data', '', length_from=lambda pkt: 0 if pkt._length is None else pkt._length - 4) ] # 0x09 .. 0x7e is reserved for future standardization and for now treated as Raw() data # noqa: E501 LLDPDU_CLASS_TYPES = { 0x00: LLDPDUEndOfLLDPDU, 0x01: LLDPDUChassisID, 0x02: LLDPDUPortID, 0x03: LLDPDUTimeToLive, 0x04: LLDPDUPortDescription, 0x05: LLDPDUSystemName, 0x06: LLDPDUSystemDescription, 0x07: LLDPDUSystemCapabilities, 0x08: LLDPDUManagementAddress, 127: LLDPDUGenericOrganisationSpecific } class LLDPConfiguration(object): """ basic configuration for LLDP layer """ def __init__(self): self._strict_mode = True self.strict_mode_enable() def strict_mode_enable(self): """ enable strict mode and dissector debugging """ self._strict_mode = True def strict_mode_disable(self): """ disable strict mode and dissector debugging """ self._strict_mode = False def strict_mode(self): """ get current strict mode state """ return self._strict_mode conf.contribs['LLDP'] = LLDPConfiguration() bind_layers(Ether, LLDPDU, type=LLDP_ETHER_TYPE) bind_layers(Dot1Q, LLDPDU, type=LLDP_ETHER_TYPE)