92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
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# This file is part of Scapy
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# See http://www.secdev.org/projects/scapy for more information
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# This program is published under GPLv2 license
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"""
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ERSPAN - Encapsulated Remote SPAN
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"""
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# scapy.contrib.description = ERSPAN - Encapsulated Remote SPAN
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# scapy.contrib.status = loads
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# This file inspired by scapy-vxlan
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from scapy.packet import Packet, bind_layers
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from scapy.fields import BitField, BitEnumField, XIntField, \
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XShortField
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from scapy.layers.l2 import Ether, GRE
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class ERSPAN(Packet):
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"""
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A generic ERSPAN packet, pointing by default to ERSPAN II
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"""
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name = "ERSPAN"
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fields_desc = []
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@classmethod
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def dispatch_hook(cls, _pkt=None, *args, **kargs):
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if cls == ERSPAN:
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return ERSPAN_II
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return Packet.dispatch_hook(cls, _pkt, *args, **kargs)
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class ERSPAN_I(ERSPAN):
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name = "ERSPAN I"
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match_subclass = True
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fields_desc = []
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class ERSPAN_II(ERSPAN):
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name = "ERSPAN II"
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match_subclass = True
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fields_desc = [BitField("ver", 0, 4),
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BitField("vlan", 0, 12),
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BitField("cos", 0, 3),
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BitField("en", 0, 2),
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BitField("t", 0, 1),
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BitField("session_id", 0, 10),
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BitField("reserved", 0, 12),
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BitField("index", 0, 20),
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]
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class ERSPAN_III(ERSPAN):
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name = "ERSPAN III"
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match_subclass = True
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fields_desc = [BitField("ver", 2, 4),
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BitField("vlan", 0, 12),
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BitField("cos", 0, 3),
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BitField("bso", 0, 2),
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BitField("t", 0, 1),
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BitField("session_id", 0, 10),
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XIntField("timestamp", 0x00000000),
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XShortField("sgt_other", 0x00000000),
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BitField("p", 0, 1),
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BitEnumField("ft", 0, 5,
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{0: "Ethernet", 2: "IP"}),
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BitField("hw", 0, 6),
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BitField("d", 0, 1),
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BitEnumField("gra", 0, 2,
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{0: "100us", 1: "100ns", 2: "IEEE 1588"}),
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BitField("o", 0, 1)
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]
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class ERSPAN_PlatformSpecific(Packet):
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name = "PlatformSpecific"
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fields_desc = [BitField("platf_id", 0, 6),
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BitField("info1", 0, 26),
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XIntField("info2", 0x00000000)]
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bind_layers(ERSPAN_I, Ether)
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bind_layers(ERSPAN_II, Ether)
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bind_layers(ERSPAN_III, Ether, o=0)
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bind_layers(ERSPAN_III, ERSPAN_PlatformSpecific, o=1)
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bind_layers(ERSPAN_PlatformSpecific, Ether)
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bind_layers(GRE, ERSPAN, proto=0x88be, seqnum_present=0)
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bind_layers(GRE, ERSPAN_II, proto=0x88be, seqnum_present=1)
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bind_layers(GRE, ERSPAN_III, proto=0x22eb)
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