generic_encap.bess

# Copyright (c) 2014-2016, The Regents of the University of California.
# Copyright (c) 2016-2017, Nefeli Networks, Inc.
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# Dummy L2 tunneling example with ethertype 0x9999

import scapy.all as scapy

eth = scapy.Ether(dst='00:02:15:37:a2:44', src='00:ae:f3:52:aa:d1')
ip = scapy.IP()
udp = scapy.UDP()
payload = 'Hello World'

test_packet = bytes(eth/ip/udp/payload)

Source() \
        -> SetMetadata(attrs=[{'name': 'ether_type', 'size': 2, 'value_int': 0x9876}]) \
        -> Rewrite(templates=[test_packet]) \
        -> GenericEncap(fields=[ \
        {'size': 6, 'value': {'value_int': 0x020000000001}},
            {'size': 6, 'value': {'value_int': 0x0619deadbeef}},
            {'size': 2, 'attribute': 'ether_type'}]) \
        -> Sink()