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"""Utilities module for of_core OpenFlow v0x04 operations.""" |
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from pyof.v0x04.common.action import ControllerMaxLen |
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from pyof.v0x04.controller2switch.common import ConfigFlag, MultipartType |
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from pyof.v0x04.controller2switch.multipart_request import (FlowStatsRequest, |
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MultipartRequest) |
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from pyof.v0x04.controller2switch.set_config import SetConfig |
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from pyof.v0x04.symmetric.echo_request import EchoRequest |
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from pyof.v0x04.symmetric.hello import Hello |
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from kytos.core.events import KytosEvent |
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from kytos.core.interface import Interface |
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from napps.kytos.of_core.utils import emit_message_out |
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def update_flow_list(controller, switch): |
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"""Request flow stats from switches. |
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Args: |
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controller(:class:`~kytos.core.controller.Controller`): |
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the controller being used. |
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switch(:class:`~kytos.core.switch.Switch`): |
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target to send a stats request. |
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Returns: |
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int: multipart request xid |
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""" |
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multipart_request = MultipartRequest() |
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multipart_request.multipart_type = MultipartType.OFPMP_FLOW |
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multipart_request.body = FlowStatsRequest() |
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emit_message_out(controller, switch.connection, multipart_request) |
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return multipart_request.header.xid |
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def send_desc_request(controller, switch): |
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"""Request vendor-specific switch description. |
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Args: |
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controller(:class:`~kytos.core.controller.Controller`): |
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the controller being used. |
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switch(:class:`~kytos.core.switch.Switch`): |
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target to send a stats request. |
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""" |
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multipart_request = MultipartRequest() |
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multipart_request.multipart_type = MultipartType.OFPMP_DESC |
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emit_message_out(controller, switch.connection, multipart_request) |
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def send_port_request(controller, connection): |
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"""Send a Port Description Request after the Features Reply.""" |
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port_request = MultipartRequest() |
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port_request.multipart_type = MultipartType.OFPMP_PORT_DESC |
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emit_message_out(controller, connection, port_request) |
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def handle_features_reply(controller, event): |
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"""Handle OF v0x04 features_reply message events. |
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This is the end of the Handshake workflow of the OpenFlow Protocol. |
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Parameters: |
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controller (Controller): Controller being used. |
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event (KytosEvent): Event with features reply message. |
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""" |
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connection = event.source |
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features_reply = event.content['message'] |
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dpid = features_reply.datapath_id.value |
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switch = controller.get_switch_or_create(dpid=dpid, |
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connection=connection) |
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send_port_request(controller, connection) |
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switch.update_features(features_reply) |
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return switch |
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def handle_port_desc(controller, switch, port_list): |
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"""Update interfaces on switch based on port_list information.""" |
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for port in port_list: |
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interface = switch.get_interface_by_port_no(port.port_no.value) |
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if interface: |
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interface.name = port.name.value |
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interface.address = port.hw_addr.value |
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interface.state = port.state.value |
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interface.features = port.curr |
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else: |
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interface = Interface(name=port.name.value, |
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address=port.hw_addr.value, |
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port_number=port.port_no.value, |
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switch=switch, |
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state=port.state.value, |
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features=port.curr) |
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switch.update_interface(interface) |
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port_event = KytosEvent(name='kytos/of_core.switch.port.created', |
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content={ |
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'switch': switch.id, |
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'port': port.port_no.value, |
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'port_description': { |
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'alias': port.name.value, |
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'mac': port.hw_addr.value, |
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'state': port.state.value |
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} |
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}) |
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controller.buffers.app.put(port_event) |
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def send_echo(controller, switch): |
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"""Send echo request to a datapath. |
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Keep the connection alive through symmetric echoes. |
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""" |
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echo = EchoRequest(data=b'kytosd_13') |
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emit_message_out(controller, switch.connection, echo) |
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def send_set_config(controller, switch): |
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"""Send a SetConfig message after the OpenFlow handshake.""" |
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set_config = SetConfig() |
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set_config.flags = ConfigFlag.OFPC_FRAG_NORMAL |
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set_config.miss_send_len = ControllerMaxLen.OFPCML_NO_BUFFER |
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emit_message_out(controller, switch.connection, set_config) |
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def say_hello(controller, connection): |
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"""Send back a Hello packet with the same version as the switch.""" |
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hello = Hello() |
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emit_message_out(controller, connection, hello) |
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def mask_to_bytes(mask, size): |
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"""Return the mask in bytes.""" |
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bits = 0 |
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for i in range(size-mask, size): |
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bits |= (1 << i) |
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tobytes = bits.to_bytes(size//8, 'big') |
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return tobytes |
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def bytes_to_mask(tobytes, size): |
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"""Return the mask in string.""" |
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int_mask = int.from_bytes(tobytes, 'big') |
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bits = bin(int_mask) |
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strbits = str(bits) |
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strbits = strbits[2:] |
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netmask = 0 |
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for i in range(size): |
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if strbits[i] == '1': |
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netmask += 1 |
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else: |
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break |
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return netmask |
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kytos /
of_core
