def unpack(cls, data, length):
# We only support IS-IS flags for now.
flags = LsGenericFlags.unpack(data[0],
LsGenericFlags.ISIS_ADJ_SR_FLAGS)
# Parse adj weight
weight = six.indexbytes(data, 1)
# Move pointer 4 bytes: Flags(1) + Weight(1) + Reserved(2)
data = data[4:]
isis_system_id = ISO.unpack_sysid(data[:6])
# SID/Index/Label: according to the V and L flags, it contains
# either:
# * A 3 octet local label where the 20 rightmost bits are used for
# encoding the label value. In this case the V and L flags MUST
# be set.
#
# * A 4 octet index defining the offset in the SID/Label space
# advertised by this router using the encodings defined in
# Section 3.1. In this case V and L flags MUST be unset.
sids = []
while data:
# Range Size: 3 octet value indicating the number of labels in
# the range.
if flags.flags['V'] and flags.flags['L']:
b = BitArray(bytes=data[:3])
sid = b.unpack('uintbe:24')[0]
data = data[3:]
elif (not flags.flags['V']) and (not flags.flags['L']):
sid = unpack('!I', data[:4])[0]
data = data[4:]
sids.append(sid)
return cls(flags=flags.flags, sids=sids, weight=weight)
def unpack(cls, data, length):
# We only support IS-IS flags for now.
flags = LsGenericFlags.unpack(data[0], LsGenericFlags.ISIS_SR_FLAGS)
#
# Parse Algorithm
sr_algo = six.indexbytes(data, 1)
# Move pointer 4 bytes: Flags(1) + Algorithm(1) + Reserved(2)
data = data[4:]
# SID/Index/Label: according to the V and L flags, it contains
# either:
# * A 3 octet local label where the 20 rightmost bits are used for
# encoding the label value. In this case the V and L flags MUST
# be set.
#
# * A 4 octet index defining the offset in the SID/Label space
# advertised by this router using the encodings defined in
# Section 3.1. In this case V and L flags MUST be unset.
sids = []
while data:
if flags.flags['V'] and flags.flags['L']:
b = BitArray(bytes=data[:3])
sid = b.unpack('uintbe:24')[0]
data = data[3:]
elif (not flags.flags['V']) and (not flags.flags['L']):
sid = unpack('!I', data[:4])[0]
data = data[4:]
sids.append(sid)
return cls(flags=flags.flags, sids=sids, sr_algo=sr_algo)
def unpack (cls,data,length):
# We only support IS-IS flags for now.
flags = LsGenericFlags.unpack(data[0:1],LsGenericFlags.ISIS_SR_FLAGS)
#
# Parse Algorithm
sr_algo = six.indexbytes(data, 1)
# Move pointer 4 bytes: Flags(1) + Algorithm(1) + Reserved(2)
data = data[4:]
# SID/Index/Label: according to the V and L flags, it contains
# either:
# * A 3 octet local label where the 20 rightmost bits are used for
# encoding the label value. In this case the V and L flags MUST
# be set.
#
# * A 4 octet index defining the offset in the SID/Label space
# advertised by this router using the encodings defined in
# Section 3.1. In this case V and L flags MUST be unset.
sids = []
while data:
if flags.flags['V'] and flags.flags['L']:
b = BitArray(bytes=data[:3])
sid = b.unpack('uintbe:24')[0]
data = data[3:]
elif (not flags.flags['V']) and \
(not flags.flags['L']):
if len(data) != 4:
# Cisco IOS XR Software, Version 6.1.1.19I is not
# correctly setting the flags
raise Notify(3,5, "SID/Label size doesn't match V and L flag state")
sid = unpack('!I', data[:4])[0]
data = data[4:]
sids.append(sid)
return cls(flags=flags, sids=sids, sr_algo=sr_algo)
def unpack (cls,data,length):
# We only support IS-IS flags for now.
flags = LsGenericFlags.unpack(data[0:1],LsGenericFlags.ISIS_SR_ADJ_FLAGS)
# Parse adj weight
weight = six.indexbytes(data,1)
# Move pointer 4 bytes: Flags(1) + Weight(1) + Reserved(2)
data = data[4:]
isis_system_id = ISO.unpack_sysid(data[:6])
# SID/Index/Label: according to the V and L flags, it contains
# either:
# * A 3 octet local label where the 20 rightmost bits are used for
# encoding the label value. In this case the V and L flags MUST
# be set.
#
# * A 4 octet index defining the offset in the SID/Label space
# advertised by this router using the encodings defined in
# Section 3.1. In this case V and L flags MUST be unset.
sids = []
while data:
# Range Size: 3 octet value indicating the number of labels in
# the range.
if int(flags.flags['V']) and int(flags.flags['L']):
b = BitArray(bytes=data[:3])
sid = b.unpack('uintbe:24')[0]
data = data[3:]
elif (not flags.flags['V']) and \
(not flags.flags['L']):
sid = unpack('!I',data[:4])[0]
data = data[4:]
sids.append(sid)
return cls(flags=flags, sids=sids, weight=weight)
def unpack (cls,data,length): sr_algos = [] while data: sr_algos.append(six.indexbytes(data,0)) data = data[1:] # Looks like IOS XR advertises len 0 on this sub TLV # when using default SPF. if not len(sr_algos): sr_algos.append(0) return cls(sr_algos=sr_algos)
def unpack(cls, data, negotiated):
sr_attrs = []
while data:
# Type = 1 octet
scode = six.indexbytes(data,0)
# L = 2 octet :|
length = unpack('!H',data[1:3])[0]
if scode in cls.registered_srids:
klass = cls.registered_srids[scode].unpack(data[3:length+3],length)
else:
klass = GenericSRId(scode,data[3:length+3])
klass.TLV = scode
sr_attrs.append(klass)
data = data[length+3:]
return cls(sr_attrs=sr_attrs)
def unpack(cls, data, length):
if len(data) == 2:
# OSPF
igpmetric = unpack('!H', data)[0]
return cls(igpmetric=igpmetric)
elif len(data) == 1:
# ISIS small metrics
igpmetric = six.indexbytes(data, 0)
return cls(igpmetric=igpmetric)
elif len(data) == 3:
# ISIS wide metrics
b = BitArray(bytes=data)
igpmetric = b.unpack('uintbe:24')
return cls(igpmetric=igpmetric)
else:
raise Notify(3, 5, "Incorrect IGP Metric Size")
def unpack (cls,data,length):
if len(data) == 2:
# OSPF
igpmetric = unpack('!H',data)[0]
return cls(igpmetric=igpmetric)
elif len(data) == 1:
# ISIS small metrics
igpmetric = six.indexbytes(data,0)
return cls(igpmetric=igpmetric)
elif len(data) == 3:
# ISIS wide metrics
b = BitArray(bytes=data)
igpmetric = b.unpack('uintbe:24')
return cls(igpmetric=igpmetric)
else:
raise Notify(3,5, "Incorrect IGP Metric Size")
def unpack(cls, data, length):
# We only support IS-IS flags for now.
flags = LsGenericFlags.unpack(data[0:1], LsGenericFlags.ISIS_SR_FLAGS)
#
# Parse Algorithm
sr_algo = six.indexbytes(data, 1)
# Move pointer 4 bytes: Flags(1) + Algorithm(1) + Reserved(2)
data = data[4:]
# SID/Index/Label: according to the V and L flags, it contains
# either:
# * A 3 octet local label where the 20 rightmost bits are used for
# encoding the label value. In this case the V and L flags MUST
# be set.
#
# * A 4 octet index defining the offset in the SID/Label space
# advertised by this router using the encodings defined in
# Section 3.1. In this case V and L flags MUST be unset.
sids = []
raw = []
while data:
if flags.flags['V'] and flags.flags['L']:
b = BitArray(bytes=data[:3])
sid = b.unpack('uintbe:24')[0]
data = data[3:]
sids.append(sid)
elif (not flags.flags['V']) and \
(not flags.flags['L']):
if len(data) != 4:
# Cisco IOS XR Software, Version 6.1.1.19I is not
# correctly setting the flags
raise Notify(
3, 5,
"SID/Label size doesn't match V and L flag state")
sid = unpack('!I', data[:4])[0]
data = data[4:]
sids.append(sid)
else:
raw.append(hexstring(data))
break
return cls(flags=flags, sids=sids, sr_algo=sr_algo, undecoded=raw)