# $Id: loopback.py 38 2007-03-17 03:33:16Z dugsong $

"""Platform-dependent loopback header."""

import dpkt, ethernet, ip, ip6

class Loopback(dpkt.Packet):
    __hdr__ = (('family', 'I', 0), )
    __byte_order__ = '@'
    def unpack(self, buf):
        dpkt.Packet.unpack(self, buf)
        if self.family == 2:
            self.data = ip.IP(self.data)
        elif self.family == 0x02000000:
            self.family = 2
            self.data = ip.IP(self.data)
        elif self.family in (24, 28, 30):
            self.data = ip6.IP6(self.data)
        elif self.family > 1500:
            self.data = ethernet.Ethernet(self.data)