@staticmethod
    def arp_parse(data):
        """
        Parse ARP packet, return ARP class from packet library.
        """
        # Iteratize pkt
        pkt = packet.Packet(data)
        i = iter(pkt)
        eth_pkt = next(i)
        # Ensure it's an ethernet frame.
        assert type(eth_pkt) == ethernet.ethernet

        arp_pkt = next(i)
        if type(arp_pkt) != arp.arp:
            raise ARPPacket.ARPUnknownFormat()

        if arp_pkt.opcode not in (ARP_REQUEST, ARP_REPLY):
            raise ARPPacket.ARPUnknownFormat(
                msg='unsupported opcode %d' % arp_pkt.opcode)

        if arp_pkt.proto != ETH_TYPE_IP:
            raise ARPPacket.ARPUnknownFormat(
                msg='unsupported arp ethtype 0x%04x' % arp_pkt.proto)

        return arp_pkt
dataset/ETHPy150Open osrg/ryu/ryu/lib/bfdlib.py/ARPPacket.arp_parse/original