/usr/lib/python2.7/dist-packages/scapy/layers/vxlan.py is in python-scapy 2.3.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | #! /usr/bin/env python
# RFC 7348 - Virtual eXtensible Local Area Network (VXLAN):
# A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
# http://tools.ietf.org/html/rfc7348
# https://www.ietf.org/id/draft-ietf-nvo3-vxlan-gpe-02.txt
#
# VXLAN Group Policy Option:
# http://tools.ietf.org/html/draft-smith-vxlan-group-policy-00
from scapy.packet import Packet, bind_layers
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from scapy.fields import FlagsField, XByteField, ThreeBytesField, \
ConditionalField, ShortField, ByteEnumField, X3BytesField
_GP_FLAGS = ["R", "R", "R", "A", "R", "R", "D", "R"]
class VXLAN(Packet):
name = "VXLAN"
fields_desc = [
FlagsField("flags", 0x8, 8,
['OAM', 'R', 'NextProtocol', 'Instance',
'V1', 'V2', 'R', 'G']),
ConditionalField(
ShortField("reserved0", 0),
lambda pkt: pkt.flags & 0x04,
),
ConditionalField(
ByteEnumField('NextProtocol', 0,
{0: 'NotDefined',
1: 'IPv4',
2: 'IPv6',
3: 'Ethernet',
4: 'NSH'}),
lambda pkt: pkt.flags & 0x04,
),
ConditionalField(
ThreeBytesField("reserved1", 0x000000),
lambda pkt: (not pkt.flags & 0x80) and (not pkt.flags & 0x04),
),
ConditionalField(
FlagsField("gpflags", 0x0, 8, _GP_FLAGS),
lambda pkt: pkt.flags & 0x80,
),
ConditionalField(
ShortField("gpid", 0),
lambda pkt: pkt.flags & 0x80,
),
X3BytesField("vni", 0),
XByteField("reserved2", 0x00),
]
# Use default linux implementation port
overload_fields = {
UDP: {'dport': 8472},
}
def mysummary(self):
if self.flags & 0x80:
return self.sprintf("VXLAN (vni=%VXLAN.vni% gpid=%VXLAN.gpid%)")
else:
return self.sprintf("VXLAN (vni=%VXLAN.vni%)")
bind_layers(UDP, VXLAN, dport=4789) # RFC standard port
bind_layers(UDP, VXLAN, dport=6633) # New IANA assigned port for use with NSH
bind_layers(UDP, VXLAN, dport=8472) # Linux implementation port
bind_layers(VXLAN, Ether, {'flags': 0x8})
bind_layers(VXLAN, Ether, {'flags': 0x88})
bind_layers(VXLAN, Ether, {'flags': 0xC, 'NextProtocol': 0}, NextProtocol=0)
bind_layers(VXLAN, IP, {'flags': 0xC, 'NextProtocol': 1}, NextProtocol=1)
bind_layers(VXLAN, IPv6, {'flags': 0xC, 'NextProtocol': 2}, NextProtocol=2)
bind_layers(VXLAN, Ether, {'flags': 0xC, 'NextProtocol': 3}, NextProtocol=3)
|