75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
|
# This file is part of Scapy
|
||
|
|
# Scapy is free software: you can redistribute it and/or modify
|
||
|
|
# it under the terms of the GNU General Public License as published by
|
||
|
|
# the Free Software Foundation, either version 2 of the License, or
|
||
|
|
# any later version.
|
||
|
|
#
|
||
|
|
# Scapy is distributed in the hope that it will be useful,
|
||
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
# GNU General Public License for more details.
|
||
|
|
#
|
||
|
|
# You should have received a copy of the GNU General Public License
|
||
|
|
# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
# scapy.contrib.description = Multiprotocol Label Switching (MPLS)
|
||
|
|
# scapy.contrib.status = loads
|
||
|
|
|
||
|
|
from scapy.packet import Packet, bind_layers, Padding
|
||
|
|
from scapy.fields import BitField, ByteField, ShortField
|
||
|
|
from scapy.layers.inet import IP, UDP
|
||
|
|
from scapy.contrib.bier import BIER
|
||
|
|
from scapy.layers.inet6 import IPv6
|
||
|
|
from scapy.layers.l2 import Ether, GRE
|
||
|
|
from scapy.compat import orb
|
||
|
|
|
||
|
|
|
||
|
|
class EoMCW(Packet):
|
||
|
|
name = "EoMCW"
|
||
|
|
fields_desc = [BitField("zero", 0, 4),
|
||
|
|
BitField("reserved", 0, 12),
|
||
|
|
ShortField("seq", 0)]
|
||
|
|
|
||
|
|
def guess_payload_class(self, payload):
|
||
|
|
if len(payload) >= 1:
|
||
|
|
return Ether
|
||
|
|
return Padding
|
||
|
|
|
||
|
|
|
||
|
|
class MPLS(Packet):
|
||
|
|
name = "MPLS"
|
||
|
|
fields_desc = [BitField("label", 3, 20),
|
||
|
|
BitField("cos", 0, 3),
|
||
|
|
BitField("s", 1, 1),
|
||
|
|
ByteField("ttl", 0)]
|
||
|
|
|
||
|
|
def guess_payload_class(self, payload):
|
||
|
|
if len(payload) >= 1:
|
||
|
|
if not self.s:
|
||
|
|
return MPLS
|
||
|
|
ip_version = (orb(payload[0]) >> 4) & 0xF
|
||
|
|
if ip_version == 4:
|
||
|
|
return IP
|
||
|
|
elif ip_version == 5:
|
||
|
|
return BIER
|
||
|
|
elif ip_version == 6:
|
||
|
|
return IPv6
|
||
|
|
else:
|
||
|
|
if orb(payload[0]) == 0 and orb(payload[1]) == 0:
|
||
|
|
return EoMCW
|
||
|
|
else:
|
||
|
|
return Ether
|
||
|
|
return Padding
|
||
|
|
|
||
|
|
|
||
|
|
bind_layers(Ether, MPLS, type=0x8847)
|
||
|
|
bind_layers(IP, MPLS, proto=137)
|
||
|
|
bind_layers(IPv6, MPLS, nh=137)
|
||
|
|
bind_layers(UDP, MPLS, dport=6635)
|
||
|
|
bind_layers(GRE, MPLS, proto=0x8847)
|
||
|
|
bind_layers(MPLS, MPLS, s=0)
|
||
|
|
bind_layers(MPLS, IP, label=0) # IPv4 Explicit NULL
|
||
|
|
bind_layers(MPLS, IPv6, label=2) # IPv6 Explicit NULL
|
||
|
|
bind_layers(MPLS, EoMCW)
|
||
|
|
bind_layers(EoMCW, Ether, zero=0, reserved=0)
|