kytos / of_core

        return cls(value)

class MatchNwDst(MatchField):

    """Match for IPV4 destination."""

    name = 'nw_dst'

    oxm_field = OxmOfbMatchField.OFPXMT_OFB_IPV4_DST

    def as_of_tlv(self):

        """Return a pyof OXM TLV instance."""

        ip_addr = IPAddress(self.value)

        value_bytes = ip_addr.pack()

        if ip_addr.netmask < 32:

            value_bytes += mask_to_bytes(ip_addr.netmask, 32)

        return OxmTLV(oxm_field=self.oxm_field,

                      oxm_hasmask=ip_addr.netmask < 32,

                      oxm_value=value_bytes)

    @classmethod

    def from_of_tlv(cls, tlv):

        """Return an instance from a pyof OXM TLV."""

        ip_address = IPAddress()

        ip_address.unpack(tlv.oxm_value)

        addr_str = str(ip_address)

        value = addr_str

        if tlv.oxm_hasmask:

            value = f'{addr_str}/{bytes_to_mask(tlv.oxm_value[4:], 32)}'

        return cls(value)

class MatchNwProto(MatchField):

        return cls(port)

class MatchNwSrc(MatchField):

    """Match for IPV4 source."""

    name = 'nw_src'

    oxm_field = OxmOfbMatchField.OFPXMT_OFB_IPV4_SRC

    def as_of_tlv(self):

        """Return a pyof OXM TLV instance."""

        ip_addr = IPAddress(self.value)

        value_bytes = ip_addr.pack()

        if ip_addr.netmask < 32:

            value_bytes += mask_to_bytes(ip_addr.netmask, 32)

        return OxmTLV(oxm_field=self.oxm_field,

                      oxm_hasmask=ip_addr.netmask < 32,

                      oxm_value=value_bytes)

    @classmethod

    def from_of_tlv(cls, tlv):

        """Return an instance from a pyof OXM TLV."""

        ip_address = IPAddress()

        ip_address.unpack(tlv.oxm_value)

        addr_str = str(ip_address)

        value = addr_str

        if tlv.oxm_hasmask:

            value = f'{addr_str}/{bytes_to_mask(tlv.oxm_value[4:], 32)}'

        return cls(value)

class MatchNwDst(MatchField):