def as_of_action(self):
"""Return a pyof ActionSetField instance."""
tlv = OxmTLV()
tlv.oxm_field = OxmOfbMatchField.OFPXMT_OFB_VLAN_VID
oxm_value = self.vlan_id | VlanId.OFPVID_PRESENT
tlv.oxm_value = oxm_value.to_bytes(2, 'big')
return OFActionSetField(field=tlv)
def _build_lldp_flow_mod(self, version):
"""Build a FlodMod message to send LLDP to the controller.
Args:
version (int): OpenFlow version.
Returns:
FlowMod message for the specific given OpenFlow version, if it is
supported.
None if the OpenFlow version is not supported.
"""
if version == 0x01:
flow_mod = FM10()
flow_mod.command = FMC.OFPFC_ADD
flow_mod.priority = settings.FLOW_PRIORITY
flow_mod.match.dl_type = EtherType.LLDP
if self.vlan_id:
flow_mod.match.dl_vlan = self.vlan_id
flow_mod.actions.append(AO10(port=Port10.OFPP_CONTROLLER))
elif version == 0x04:
flow_mod = FM13()
flow_mod.command = FMC.OFPFC_ADD
flow_mod.priority = settings.FLOW_PRIORITY
match_lldp = OxmTLV()
match_lldp.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_TYPE
match_lldp.oxm_value = EtherType.LLDP.to_bytes(2, 'big')
flow_mod.match.oxm_match_fields.append(match_lldp)
if self.vlan_id:
match_vlan = OxmTLV()
match_vlan.oxm_field = OxmOfbMatchField.OFPXMT_OFB_VLAN_VID
vlan_value = self.vlan_id | VlanId.OFPVID_PRESENT
match_vlan.oxm_value = vlan_value.to_bytes(2, 'big')
flow_mod.match.oxm_match_fields.append(match_vlan)
instruction = InstructionApplyAction()
instruction.actions.append(AO13(port=Port13.OFPP_CONTROLLER))
flow_mod.instructions.append(instruction)
else:
flow_mod = None
return flow_mod
def _create_flow_mod(version, packet, port):
"""Create a FlowMod message with the appropriate version and data."""
if version == '0x01':
flow_mod = FlowMod10()
flow_mod.match.dl_src = packet.source.value
flow_mod.match.dl_dst = packet.destination.value
flow_mod.match.dl_type = packet.ether_type
flow_mod.actions.append(Output10(port=port))
else:
flow_mod = FlowMod13()
match_dl_type = OxmTLV()
match_dl_type.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_TYPE
match_dl_type.oxm_value = packet.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 = packet.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 = packet.destination.pack()
flow_mod.match.oxm_match_fields.append(match_dl_dst)
action = Output13(port=port)
instruction = InstructionApplyAction()
instruction.actions.append(action)
flow_mod.instructions.append(instruction)
flow_mod.command = FlowModCommand.OFPFC_ADD
flow_mod.priority = settings.FLOW_PRIORITY
return flow_mod
def _match_from_dict(self, dictionary):
known_fields = ((field, data) for field, data in dictionary.items()
if field in self._match_names)
for field_name, data in known_fields:
tlv = OxmTLV()
tlv.oxm_field = self._match_names[field_name]
# set oxm_value
if field_name in ('dl_vlan_pcp', 'nw_proto'):
tlv.oxm_value = data.to_bytes(1, 'big')
elif field_name == 'dl_vlan':
vid = data | VlanId.OFPVID_PRESENT
tlv.oxm_value = vid.to_bytes(2, 'big')
elif field_name in ('dl_src', 'dl_dst'):
tlv.oxm_value = HWAddress(data).pack()
elif field_name in ('nw_src', 'nw_dst'):
tlv.oxm_value = IPAddress(data).pack()
elif field_name == 'in_port':
tlv.oxm_value = data.to_bytes(4, 'big')
else:
tlv.oxm_value = data.to_bytes(2, 'big')
yield tlv
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 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)
