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"""OpenFlow 1.3 OXM match fields. |
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Flow's match is very different from OF 1.0. Instead of always having all |
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fields, there's a variable list of match fields and each one is an Openflow |
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eXtended Match Type-Length-Value (OXM TLV) element. |
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This module provides high-level Python classes for OXM TLV fields in order to |
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make the OF 1.3 match fields easy to use and to be coded. |
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""" |
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from abc import ABC, abstractmethod |
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from pyof.foundation.basic_types import HWAddress, IPAddress |
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from pyof.v0x04.common.flow_match import OxmOfbMatchField, OxmTLV, VlanId |
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class MatchField(ABC): |
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"""Base class for match fields. Abstract OXM TLVs of python-openflow. |
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Just extend this class and you will be forced to define the required |
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low-level attributes and methods below: |
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* "name" attribute (field name to be displayed in JSON); |
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* "oxm_field" attribute (``OxmOfbMatchField`` enum); |
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* Method to return a pyof OxmTLV; |
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* Method to create an instance from an OxmTLV. |
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""" |
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def __init__(self, value): |
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"""Define match field value.""" |
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self.value = value |
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@property |
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@classmethod |
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@abstractmethod |
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def name(cls): |
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"""Define a name to be displayed in JSON. |
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It can be overriden just by a class attibute. |
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""" |
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pass |
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@property |
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@classmethod |
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@abstractmethod |
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def oxm_field(cls): |
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"""Define this subclass ``OxmOfbMatchField`` value. |
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It can be overriden just by as a class attibute. |
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""" |
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pass |
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@abstractmethod |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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pass |
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@classmethod |
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@abstractmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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pass |
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def __eq__(self, other): |
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"""Two objects are equal if their values are the same. |
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The oxm_field equality is checked indirectly when comparing whether |
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the objects are instances of the same class. |
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""" |
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return isinstance(other, self.__class__) and other.value == self.value |
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class MatchDLVLAN(MatchField): |
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"""Match for datalink VLAN ID.""" |
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name = 'dl_vlan' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_VLAN_VID |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value = self.value | VlanId.OFPVID_PRESENT |
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value_bytes = value.to_bytes(2, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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vlan_id = int.from_bytes(tlv.oxm_value, 'big') & 4095 |
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return cls(vlan_id) |
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class MatchDLVLANPCP(MatchField): |
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"""Match for VLAN Priority Code Point.""" |
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name = 'dl_vlan_pcp' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_VLAN_PCP |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(1, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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priority = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(priority) |
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class MatchDLSrc(MatchField): |
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"""Match for datalink source.""" |
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name = 'dl_src' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_SRC |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = HWAddress(self.value).pack() |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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hw_address = HWAddress() |
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hw_address.unpack(tlv.oxm_value) |
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addr_str = str(hw_address) |
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return cls(addr_str) |
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class MatchDLDst(MatchField): |
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"""Match for dataling destination.""" |
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name = 'dl_dst' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_DST |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = HWAddress(self.value).pack() |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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hw_address = HWAddress() |
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hw_address.unpack(tlv.oxm_value) |
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addr_str = str(hw_address) |
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return cls(addr_str) |
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class MatchDLType(MatchField): |
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"""Match for datalink type.""" |
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name = 'dl_type' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_TYPE |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(2, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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port = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(port) |
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class MatchNwSrc(MatchField): |
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"""Match for IPV4 source.""" |
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name = 'nw_src' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_IPV4_SRC |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = IPAddress(self.value).pack() |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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ip_address = IPAddress() |
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ip_address.unpack(tlv.oxm_value) |
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ip_str = str(ip_address) |
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return cls(ip_str) |
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class MatchNwDst(MatchField): |
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"""Match for IPV4 destination.""" |
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name = 'nw_dst' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_IPV4_DST |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = IPAddress(self.value).pack() |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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ip_address = IPAddress() |
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ip_address.unpack(tlv.oxm_value) |
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ip_str = str(ip_address) |
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return cls(ip_str) |
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class MatchNwProto(MatchField): |
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"""Match for IP protocol.""" |
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name = 'nw_proto' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_IP_PROTO |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(1, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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priority = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(priority) |
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class MatchInPort(MatchField): |
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"""Match for input port.""" |
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name = 'in_port' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_IN_PORT |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(4, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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port = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(port) |
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class MatchTCPSrc(MatchField): |
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"""Match for TCP source.""" |
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name = 'tp_src' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_TCP_SRC |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(2, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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port = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(port) |
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class MatchTCPDst(MatchField): |
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"""Match for TCP destination.""" |
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name = 'tp_dst' |
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oxm_field = OxmOfbMatchField.OFPXMT_OFB_TCP_DST |
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def as_of_tlv(self): |
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"""Return a pyof OXM TLV instance.""" |
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value_bytes = self.value.to_bytes(2, 'big') |
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return OxmTLV(oxm_field=self.oxm_field, oxm_value=value_bytes) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return an instance from a pyof OXM TLV.""" |
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port = int.from_bytes(tlv.oxm_value, 'big') |
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return cls(port) |
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class MatchFieldFactory(ABC): |
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"""Create the correct MatchField subclass instance. |
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As OF 1.3 has many match fields and there are many ways to (un)pack their |
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OxmTLV.oxm_value, this class does all the work of finding the correct |
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MatchField class and instantiating the corresponding object. |
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""" |
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__classes = {} |
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@classmethod |
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def from_name(cls, name, value): |
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"""Return the proper object from name and value.""" |
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field_class = cls._get_class(name) |
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if field_class: |
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return field_class(value) |
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@classmethod |
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def from_of_tlv(cls, tlv): |
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"""Return the proper object from a pyof OXM TLV.""" |
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field_class = cls._get_class(tlv.oxm_field) |
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if field_class: |
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return field_class.from_of_tlv(tlv) |
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@classmethod |
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def _get_class(cls, name_or_field): |
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"""Return the proper object from field name or OxmTLV.oxm_field.""" |
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if not cls.__classes: |
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cls._index_classes() |
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return cls.__classes.get(name_or_field) |
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@classmethod |
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def _index_classes(cls): |
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for subclass in MatchField.__subclasses__(): |
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cls.__classes[subclass.name] = subclass |
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cls.__classes[subclass.oxm_field] = subclass |
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