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 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',
range(0x08, 0xff): 'reserved'
}
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: len(pkt.id) + 1),
ByteEnumField('subtype', 0x00, LLDP_PORT_ID_TLV_SUBTYPES),
StrLenField('id', '', length_from=lambda pkt: pkt._length - 1)
]
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')
def post_dissect(self, s):
self._check()
return super(LLDPDUPortID, self).post_dissect(s)
def do_build(self):
self._check()
return super(LLDPDUPortID, self).do_build()