def handle_packet_in(self, event):
"""Handle PacketIn Event.
Install flows allowing communication between switch ports.
Args:
event (KytosPacketIn): Received Event
"""
log.debug("PacketIn Received")
packet_in = event.content['message']
ethernet = Ethernet()
ethernet.unpack(packet_in.data.value)
# Ignore LLDP packets or packets not generated by table-miss flows
if (ethernet.destination in settings.lldp_macs
or packet_in.reason != PacketInReason.OFPR_NO_MATCH):
return
# Learn the port where the sender is connected
in_port = packet_in.in_port.value
switch = event.source.switch
switch.update_mac_table(ethernet.source, in_port)
ports = switch.where_is_mac(ethernet.destination)
# Add a flow to the switch if the destination is known
if ports:
flow_mod = FlowMod()
flow_mod.command = FlowModCommand.OFPFC_ADD
flow_mod.match = Match()
flow_mod.match.dl_src = ethernet.source.value
flow_mod.match.dl_dst = ethernet.destination.value
flow_mod.match.dl_type = ethernet.ether_type
flow_mod.actions.append(ActionOutput(port=ports[0]))
event_out = KytosEvent(name=('kytos/of_l2ls.messages.out.'
'ofpt_flow_mod'),
content={
'destination': event.source,
'message': flow_mod
})
self.controller.buffers.msg_out.put(event_out)
# Send the packet to correct destination or flood it
packet_out = PacketOut()
packet_out.buffer_id = packet_in.buffer_id
packet_out.in_port = packet_in.in_port
packet_out.data = packet_in.data
port = ports[0] if ports else Port.OFPP_FLOOD
packet_out.actions.append(ActionOutput(port=port))
event_out = KytosEvent(name=('kytos/of_l2ls.messages.out.'
'ofpt_packet_out'),
content={
'destination': event.source,
'message': packet_out
})
self.controller.buffers.msg_out.put(event_out)
def send_packet_out(controller, switch, port, data):
""" Just prepare the PacketOut to be used by the Tracer.
Args:
controller: Kytos controller
switch: OpenFlow datapath
port: in_port
data: Ethernet frame
Return:
output_action = ActionOutput
"""
output_action = ActionOutput()
output_action.port = settings.OFPP_TABLE
packet_out = PacketOut()
packet_out.actions.append(output_action)
packet_out.in_port = port
packet_out.data = bytes(data)
event_out = KytosEvent()
event_out.name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
event_out.content = {
'destination': switch.connection,
'message': packet_out
}
log.debug('PacketOut %s sent' % event_out.content)
controller.buffers.msg_out.put(event_out)
def send_packet_out(controller, switch, port, data):
""" Just prepare the PacketOut to be used by the Tracer.
Args:
controller: Kytos controller
switch: OpenFlow datapath
port: in_port
data: Ethernet frame
Return:
output_action = ActionOutput
"""
output_action = ActionOutput()
output_action.port = settings.OFPP_TABLE
packet_out = PacketOut()
packet_out.actions.append(output_action)
packet_out.in_port = port
packet_out.data = bytes(data)
event_out = KytosEvent()
event_out.name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
event_out.content = {'destination': switch.connection,
'message': packet_out}
log.debug('PacketOut %s sent' % event_out.content)
controller.buffers.msg_out.put(event_out)
def _actions_from_list(action_list):
"""Return actions found in the action list."""
actions = []
for action in action_list:
if action['action_type'] == 'set_vlan':
new_action = ActionVlanVid(vlan_id=action['vlan_id'])
elif action['action_type'] == 'output':
if action['port'] == 'controller':
new_action = ActionOutput(port=Port.OFPP_CONTROLLER)
else:
new_action = ActionOutput(port=action['port'])
else:
continue
actions.append(new_action)
return actions
def as_of_action(self):
"""Build a Action Output from this action.
Returns:
|action_output|: A instance of ActionOutput.
"""
return ActionOutput(port=self.output_port)
def send_packet_out(controller, switch, port, data):
""" Just prepare and send a PacketOut used by
the Tracer. """
output_action = ActionOutput()
output_action.port = settings.OFPP_TABLE
packet_out = PacketOut()
packet_out.actions.append(output_action)
packet_out.in_port = port
packet_out.data = bytes(data)
event_out = KytosEvent()
event_out.name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
event_out.content = {
'destination': switch.connection,
'message': packet_out
}
log.debug('PacketOut %s sent' % event_out.content)
controller.buffers.msg_out.put(event_out)
def execute(self):
"""Implement a loop to check switches liveness."""
switches = list(self.controller.switches.values())
for switch in switches:
if not (switch.is_connected() and
switch.connection.protocol.version == 0x01):
continue
# Gerar lldp para cada uma das portas do switch
# Gerar o hash de cada um dos pacotes e armazenar
for port in switch.features.ports:
output_action = ActionOutput()
output_action.port = port.port_no
# Avoid ports with speed == 0
if port.port_no.value == 65534:
continue
ethernet = Ethernet()
ethernet.ether_type = constants.LLDP_ETHERTYPE
ethernet.source = port.hw_addr
ethernet.destination = constants.LLDP_MULTICAST_MAC
lldp = LLDP()
lldp.chassis_id.sub_value = DPID(switch.dpid)
lldp.port_id.sub_value = port.port_no
ethernet.data = lldp.pack()
packet_out = PacketOut()
packet_out.actions.append(output_action)
packet_out.data = ethernet.pack()
event_out = KytosEvent()
event_out.name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
event_out.content = {'destination': switch.connection,
'message': packet_out}
self.controller.buffers.msg_out.put(event_out)
log.debug("Sending a LLDP PacketOut to the switch %s",
switch.dpid)
def _get_actions():
"""Return a List of actions registered by flow object."""
action = ActionOutput(port=65533, max_length=65535)
return [action]
def _get_actions():
"""Function used to return a list of actions used by packetout instance."""
action = ActionOutput(port=1, max_length=0)
return [action]