def _generate_config_bpdu(self, flags):
src_mac = self.ofport.hw_addr
dst_mac = bpdu.BRIDGE_GROUP_ADDRESS
length = (bpdu.bpdu._PACK_LEN + bpdu.ConfigurationBPDUs.PACK_LEN
+ llc.llc._PACK_LEN + llc.ControlFormatU._PACK_LEN)
e = ethernet.ethernet(dst_mac, src_mac, length)
l = llc.llc(llc.SAP_BPDU, llc.SAP_BPDU, llc.ControlFormatU())
b = bpdu.ConfigurationBPDUs(
flags=flags,
root_priority=self.port_priority.root_id.priority,
root_mac_address=self.port_priority.root_id.mac_addr,
root_path_cost=self.port_priority.root_path_cost + self.path_cost,
bridge_priority=self.bridge_id.priority,
bridge_mac_address=self.bridge_id.mac_addr,
port_priority=self.port_id.priority,
port_number=self.ofport.port_no,
message_age=self.port_times.message_age + 1,
max_age=self.port_times.max_age,
hello_time=self.port_times.hello_time,
forward_delay=self.port_times.forward_delay)
pkt = packet.Packet()
pkt.add_protocol(e)
pkt.add_protocol(l)
pkt.add_protocol(b)
pkt.serialize()
return pkt.data
def setUp(self):
self.protocol_id = bpdu.PROTOCOL_IDENTIFIER
self.version_id = bpdu.ConfigurationBPDUs.VERSION_ID
self.bpdu_type = bpdu.ConfigurationBPDUs.BPDU_TYPE
self.flags = 0b00000001
self.root_priority = 4096
self.root_system_id_extension = 1
self.root_mac_address = '12:34:56:78:9a:bc'
self.root_path_cost = 2
self.bridge_priority = 8192
self.bridge_system_id_extension = 3
self.bridge_mac_address = 'aa:aa:aa:aa:aa:aa'
self.port_priority = 16
self.port_number = 4
self.message_age = 5
self.max_age = 6
self.hello_time = 7
self.forward_delay = 8
self.msg = bpdu.ConfigurationBPDUs(
flags=self.flags,
root_priority=self.root_priority,
root_system_id_extension=self.root_system_id_extension,
root_mac_address=self.root_mac_address,
root_path_cost=self.root_path_cost,
bridge_priority=self.bridge_priority,
bridge_system_id_extension=self.bridge_system_id_extension,
bridge_mac_address=self.bridge_mac_address,
port_priority=self.port_priority,
port_number=self.port_number,
message_age=self.message_age,
max_age=self.max_age,
hello_time=self.hello_time,
forward_delay=self.forward_delay)
self.fmt = (bpdu.bpdu._PACK_STR +
bpdu.ConfigurationBPDUs._PACK_STR[1:])
self.buf = struct.pack(
self.fmt, self.protocol_id, self.version_id, self.bpdu_type,
self.flags,
bpdu.ConfigurationBPDUs.encode_bridge_id(
self.root_priority, self.root_system_id_extension,
self.root_mac_address), self.root_path_cost,
bpdu.ConfigurationBPDUs.encode_bridge_id(
self.bridge_priority, self.bridge_system_id_extension,
self.bridge_mac_address),
bpdu.ConfigurationBPDUs.encode_port_id(self.port_priority,
self.port_number),
bpdu.ConfigurationBPDUs._encode_timer(self.message_age),
bpdu.ConfigurationBPDUs._encode_timer(self.max_age),
bpdu.ConfigurationBPDUs._encode_timer(self.hello_time),
bpdu.ConfigurationBPDUs._encode_timer(self.forward_delay))