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Scapy and IP Options, 12.07.2015 23:56

Create packets with custom IPv4 IP Option fields using Scapy:

>>> packet=IP(src="203.0.113.1",dst="203.0.113.2",options=[IPOption('%s%s'%('\x86\x28','a'*38))])
>>> ls(packet)
version    : BitField             = 4               (4)
ihl        : BitField             = None            (None)
tos        : XByteField           = 0               (0)
len        : ShortField           = None            (None)
id         : ShortField           = 1               (1)
flags      : FlagsField           = 0               (0)
frag       : BitField             = 0               (0)
ttl        : ByteField            = 64              (64)
proto      : ByteEnumField        = 0               (0)
chksum     : XShortField          = None            (None)
src        : Emph                 = '203.0.113.1'   (None)
dst        : Emph                 = '203.0.113.2'   ('127.0.0.1')
options    : PacketListField      = [<IPOption  copy_flag=1L optclass=control option=commercial_security length=40 value='aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' |>] ([])
>>> sr1(packet)

The above code results in the following packet (as seen by Wireshark):

Wireshark showing the packet with the custom IP Option

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