def unpack_nlri(cls, data, rd):
proto_id = unpack('!B', data[0:1])[0]
# FIXME: all these list should probably be defined in the objects
iface_addrs = []
neigh_addrs = []
link_identifiers = []
topology_ids = []
remote_node = []
local_node = []
if proto_id not in PROTO_CODES.keys():
raise Exception('Protocol-ID {} is not valid'.format(proto_id))
domain = unpack('!Q', data[1:9])[0]
tlvs = data[9:]
while tlvs:
tlv_type, tlv_length = unpack('!HH', tlvs[:4])
value = tlvs[4 : 4 + tlv_length]
tlvs = tlvs[4 + tlv_length :]
if tlv_type == 256:
local_node = []
while value:
# Unpack Local Node Descriptor Sub-TLVs
# We pass proto_id as TLV interpretation
# follows IGP type
node, left = NodeDescriptor.unpack(value, proto_id)
local_node.append(node)
if left == value:
raise RuntimeError("sub-calls should consume data")
value = left
continue
if tlv_type == 257:
# Remote Node Descriptor
remote_node = []
while value:
node, left = NodeDescriptor.unpack(value, proto_id)
remote_node.append(node)
if left == value:
raise RuntimeError("sub-calls should consume data")
value = left
continue
if tlv_type == 258:
# Link Local/Remote identifiers
link_identifiers = LinkIdentifier.unpack(value)
continue
if tlv_type in [259, 261]:
# IPv{4,6} Interface Address
iface_addrs.append(IfaceAddr.unpack(value))
continue
if tlv_type in [260, 262]:
# IPv{4,6} Neighbor Address
neigh_addrs.append(NeighAddr.unpack(value))
continue
if tlv_type == 263:
topology_ids.append(MTID.unpack(value))
continue
raise RuntimeError('Not implemented')
return cls(
domain=domain,
proto_id=proto_id,
local_node=local_node,
remote_node=remote_node,
neigh_addrs=neigh_addrs,
iface_addrs=iface_addrs,
link_ids=link_identifiers,
topology_ids=topology_ids,
route_d=rd,
packed=data,
)
def unpack(cls, data, rd):
proto_id = unpack('!B', data[0:1])[0]
iface_addrs = []
neigh_addrs = []
link_identifiers = []
remote_node = []
local_node = []
if proto_id not in PROTO_CODES.keys():
raise Exception('Protocol-ID {} is not valid'.format(proto_id))
domain = unpack('!Q', data[1:9])[0]
tlvs = data[9:]
while tlvs:
tlv_type, tlv_length = unpack('!HH', tlvs[:4])
if tlv_type == 256:
values = tlvs[4:4 + tlv_length]
local_node = []
while values:
# Unpack Local Node Descriptor Sub-TLVs
# We pass proto_id as TLV interpretation
# follows IGP type
node, left = NodeDescriptor.unpack(values, proto_id)
local_node.append(node)
if left == tlvs:
raise RuntimeError("sub-calls should consume data")
values = left
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type == 257:
# Remote Node Descriptor
values = tlvs[4:4 + tlv_length]
remote_node = []
while values:
node, left = NodeDescriptor.unpack(values, proto_id)
remote_node.append(node)
if left == tlvs:
raise RuntimeError("sub-calls should consume data")
values = left
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type == 258:
# Link Local/Remote identifiers
value = tlvs[4:4 + 8]
link_identifiers = LinkIdentifier.unpack(value)
tlvs = tlvs[4 + 8:]
continue
elif tlv_type in [259, 261]:
# IPv{4,6} Interface Address
value = tlvs[4:4 + tlv_length]
iface_addrs.append(IfaceAddr.unpack(value))
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type in [260, 262]:
# IPv{4,6} Neighbor Address
value = tlvs[4:4 + tlv_length]
neigh_addrs.append(NeighAddr.unpack(value))
tlvs = tlvs[4 + tlv_length:]
continue
return cls(domain=domain,
proto_id=proto_id,
local_node=local_node,
remote_node=remote_node,
neigh_addrs=neigh_addrs,
iface_addrs=iface_addrs,
link_ids=link_identifiers,
route_d=rd,
packed=data)
def unpack (cls, data, rd):
proto_id = unpack('!B',data[0])[0]
iface_addrs = []
neigh_addrs = []
link_identifiers = []
remote_node = []
local_node = []
if proto_id not in PROTO_CODES.keys():
raise Exception('Protocol-ID {} is not valid'.format(proto_id))
domain = unpack('!Q',data[1:9])[0]
tlvs = data[9:]
while tlvs:
tlv_type, tlv_length = unpack('!HH', tlvs[:4])
if tlv_type == 256:
values = tlvs[4: 4 + tlv_length]
local_node = []
while values:
# Unpack Local Node Descriptor Sub-TLVs
# We pass proto_id as TLV interpretation
# follows IGP type
node, left = NodeDescriptor.unpack(values, proto_id)
local_node.append(node)
if left == tlvs:
raise RuntimeError("sub-calls should consume data")
values = left
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type == 257:
# Remote Node Descriptor
values = tlvs[4: 4 + tlv_length]
remote_node = []
while values:
node, left = NodeDescriptor.unpack(values, proto_id)
remote_node.append(node)
if left == tlvs:
raise RuntimeError("sub-calls should consume data")
values = left
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type == 258:
# Link Local/Remote identifiers
value = tlvs[4: 4 + 8]
link_identifiers = LinkIdentifier.unpack(value)
tlvs = tlvs[4 + 8:]
continue
elif tlv_type in [259,261]:
# IPv{4,6} Interface Address
value = tlvs[4: 4 + tlv_length]
iface_addrs.append(IfaceAddr.unpack(value))
tlvs = tlvs[4 + tlv_length:]
continue
elif tlv_type in [260,262]:
# IPv{4,6} Neighbor Address
value = tlvs[4: 4 + tlv_length]
neigh_addrs.append(NeighAddr.unpack(value))
tlvs = tlvs[4 + tlv_length:]
continue
return cls(domain=domain,proto_id=proto_id,
local_node=local_node,remote_node=remote_node,
neigh_addrs=neigh_addrs,iface_addrs=iface_addrs,
link_ids=link_identifiers,route_d=rd,packed=data)