def as_of_tlv(self):
"""Return a pyof OXM TLV instance."""
value_bytes = self.value.to_bytes(2, 'big')
return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes)
def _create_vlan_tlv(vlan_id):
tlv = OxmTLV()
tlv.oxm_field = OxmOfbMatchField.OFPXMT_OFB_VLAN_VID
oxm_value = vlan_id | VlanId.OFPVID_PRESENT
tlv.oxm_value = oxm_value.to_bytes(2, 'big')
return tlv
def as_of_tlv(self):
"""Return a pyof OXM TLV instance."""
value_bytes = IPAddress(self.value).pack()
return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes)
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
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.priority = settings.flow_priority
match_dl_type = OxmTLV()
match_dl_type.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_TYPE
match_dl_type.oxm_value = ethernet.ether_type.value.to_bytes(
2, 'big')
flow_mod.match.oxm_match_fields.append(match_dl_type)
match_dl_src = OxmTLV()
match_dl_src.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_SRC
match_dl_src.oxm_value = ethernet.source.pack()
flow_mod.match.oxm_match_fields.append(match_dl_src)
match_dl_dst = OxmTLV()
match_dl_dst.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_DST
match_dl_dst.oxm_value = ethernet.destination.pack()
flow_mod.match.oxm_match_fields.append(match_dl_dst)
action = ActionOutput(port=ports[0])
instruction = InstructionApplyAction()
instruction.actions.append(action)
flow_mod.instructions.append(instruction)
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 = in_port
packet_out.data = packet_in.data
port = ports[0] if ports else PortNo.OFPP_FLOOD
out_action = ActionOutput(port=port)
packet_out.actions.append(out_action)
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)