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"""Helper python-openflow functions.""" |
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# System imports |
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# Third-party imports |
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# Local source tree imports |
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# Importing asynchronous messages |
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from pyof.v0x04.asynchronous.error_msg import ErrorMsg |
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from pyof.v0x04.asynchronous.flow_removed import FlowRemoved |
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from pyof.v0x04.asynchronous.packet_in import PacketIn |
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from pyof.v0x04.asynchronous.port_status import PortStatus |
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# Importing controller2switch messages |
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from pyof.v0x04.common.header import Header, Type |
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from pyof.v0x04.controller2switch.barrier_reply import BarrierReply |
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from pyof.v0x04.controller2switch.barrier_request import BarrierRequest |
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from pyof.v0x04.controller2switch.features_reply import FeaturesReply |
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from pyof.v0x04.controller2switch.features_request import FeaturesRequest |
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from pyof.v0x04.controller2switch.flow_mod import FlowMod |
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from pyof.v0x04.controller2switch.get_async_reply import GetAsyncReply |
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from pyof.v0x04.controller2switch.get_async_request import GetAsyncRequest |
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from pyof.v0x04.controller2switch.get_config_reply import GetConfigReply |
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from pyof.v0x04.controller2switch.get_config_request import GetConfigRequest |
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from pyof.v0x04.controller2switch.group_mod import GroupMod |
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from pyof.v0x04.controller2switch.meter_mod import MeterMod |
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from pyof.v0x04.controller2switch.multipart_reply import MultipartReply |
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from pyof.v0x04.controller2switch.multipart_request import MultipartRequest |
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from pyof.v0x04.controller2switch.packet_out import PacketOut |
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from pyof.v0x04.controller2switch.port_mod import PortMod |
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from pyof.v0x04.controller2switch.queue_get_config_reply import ( |
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QueueGetConfigReply) |
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from pyof.v0x04.controller2switch.queue_get_config_request import ( |
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QueueGetConfigRequest) |
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from pyof.v0x04.controller2switch.role_reply import RoleReply |
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from pyof.v0x04.controller2switch.role_request import RoleRequest |
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from pyof.v0x04.controller2switch.set_async import SetAsync |
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from pyof.v0x04.controller2switch.set_config import SetConfig |
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from pyof.v0x04.controller2switch.table_mod import TableMod |
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# Importing symmetric messages |
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from pyof.v0x04.symmetric.echo_reply import EchoReply |
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from pyof.v0x04.symmetric.echo_request import EchoRequest |
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from pyof.v0x04.symmetric.experimenter import ExperimenterHeader |
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from pyof.v0x04.symmetric.hello import Hello |
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__all__ = ('MESSAGE_TYPES', 'new_message_from_header', |
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'new_message_from_message_type', 'unpack_message') |
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MESSAGE_TYPES = { |
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# Symetric/Immutable messages |
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str(Type.OFPT_HELLO): Hello, |
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str(Type.OFPT_ERROR): ErrorMsg, |
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str(Type.OFPT_ECHO_REQUEST): EchoRequest, |
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str(Type.OFPT_ECHO_REPLY): EchoReply, |
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str(Type.OFPT_EXPERIMENTER): ExperimenterHeader, |
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# Switch configuration messages |
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# Controller/Switch messages |
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str(Type.OFPT_FEATURES_REQUEST): FeaturesRequest, |
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str(Type.OFPT_FEATURES_REPLY): FeaturesReply, |
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str(Type.OFPT_GET_CONFIG_REQUEST): GetConfigRequest, |
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str(Type.OFPT_GET_CONFIG_REPLY): GetConfigReply, |
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str(Type.OFPT_SET_CONFIG): SetConfig, |
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# Async messages |
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str(Type.OFPT_PACKET_IN): PacketIn, |
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str(Type.OFPT_FLOW_REMOVED): FlowRemoved, |
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str(Type.OFPT_PORT_STATUS): PortStatus, |
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# Controller command messages |
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# Controller/Switch message |
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str(Type.OFPT_PACKET_OUT): PacketOut, |
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str(Type.OFPT_FLOW_MOD): FlowMod, |
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str(Type.OFPT_GROUP_MOD): GroupMod, |
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str(Type.OFPT_PORT_MOD): PortMod, |
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str(Type.OFPT_TABLE_MOD): TableMod, |
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# Multipart messages. |
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# Controller/Switch message |
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str(Type.OFPT_MULTIPART_REPLY): MultipartReply, |
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str(Type.OFPT_MULTIPART_REQUEST): MultipartRequest, |
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# Barrier messages |
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# Controller/Switch message |
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str(Type.OFPT_BARRIER_REQUEST): BarrierRequest, |
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str(Type.OFPT_BARRIER_REPLY): BarrierReply, |
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# Queue Configuration messages |
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# Controller/Switch message |
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str(Type.OFPT_QUEUE_GET_CONFIG_REQUEST): QueueGetConfigRequest, |
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str(Type.OFPT_QUEUE_GET_CONFIG_REPLY): QueueGetConfigReply, |
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# Controller role change request message |
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# Controller/Switch message |
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str(Type.OFPT_ROLE_REQUEST): RoleRequest, |
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str(Type.OFPT_ROLE_REPLY): RoleReply, |
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# Asynchronous message configuration |
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# Controller/Switch message |
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str(Type.OFPT_GET_ASYNC_REQUEST): GetAsyncRequest, |
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str(Type.OFPT_GET_ASYNC_REPLY): GetAsyncReply, |
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str(Type.OFPT_SET_ASYNC): SetAsync, |
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# Meters and rate limiters configuration messages |
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# Controller/Switch message |
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str(Type.OFPT_METER_MOD): MeterMod, |
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} |
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def new_message_from_message_type(message_type): |
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"""Given an OpenFlow Message Type, return an empty message of that type. |
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Args: |
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messageType (:class:`~pyof.v0x04.common.header.Type`): |
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Python-openflow message. |
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Returns: |
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Empty OpenFlow message of the requested message type. |
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Raises: |
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KytosUndefinedMessageType: Unkown Message_Type. |
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""" |
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message_type = str(message_type) |
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if message_type not in MESSAGE_TYPES: |
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msg = "Define class for {} in {}".format(message_type, __file__) |
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raise ValueError(msg) |
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message_class = MESSAGE_TYPES.get(message_type) |
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message_instance = message_class() |
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return message_instance |
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View Code Duplication |
def new_message_from_header(header): |
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"""Given an OF Header, return an empty message of header's message_type. |
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Args: |
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header (:class:`~pyof.v0x04.common.header.Header`): |
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Unpacked OpenFlow Header. |
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Returns: |
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Empty OpenFlow message of the same type of message_type attribute from |
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the given header. |
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The header attribute of the message will be populated. |
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Raises: |
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KytosUndefinedMessageType: Unkown Message_Type. |
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""" |
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message_type = header.message_type |
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if not isinstance(message_type, Type): |
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try: |
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if isinstance(message_type, str): |
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message_type = Type[message_type] |
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elif isinstance(message_type, int): |
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message_type = Type(message_type) |
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except ValueError: |
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raise ValueError |
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message = new_message_from_message_type(message_type) |
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message.header.xid = header.xid |
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message.header.length = header.length |
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return message |
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View Code Duplication |
def unpack_message(buffer): |
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"""Unpack the whole buffer, including header pack. |
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Args: |
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buffer (bytes): Bytes representation of a openflow message. |
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Returns: |
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object: Instance of openflow message. |
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""" |
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hdr_size = Header().get_size() |
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hdr_buff, msg_buff = buffer[:hdr_size], buffer[hdr_size:] |
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header = Header() |
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header.unpack(hdr_buff) |
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message = new_message_from_header(header) |
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message.unpack(msg_buff) |
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return message |
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kytos /
python-openflow
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