70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
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# This file is part of Scapy
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# Scapy is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# any later version.
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#
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# Scapy is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
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# scapy.contrib.description = Bit Index Explicit Replication (BIER)
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# scapy.contrib.status = loads
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from scapy.packet import Packet, bind_layers
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from scapy.fields import BitEnumField, BitField, BitFieldLenField, ByteField, \
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ShortField, StrLenField
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from scapy.layers.inet import IP, UDP
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from scapy.layers.inet6 import IPv6
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class BIERLength:
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BIER_LEN_64 = 0
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BIER_LEN_128 = 1
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BIER_LEN_256 = 2
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BIER_LEN_512 = 3
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BIER_LEN_1024 = 4
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BIERnhcls = {1: "MPLS",
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2: "MPLS",
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4: "IPv4",
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5: "IPv6"}
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class BIFT(Packet):
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name = "BIFT"
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fields_desc = [BitField("bsl", BIERLength.BIER_LEN_256, 4),
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BitField("sd", 0, 8),
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BitField("set", 0, 8),
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BitField("cos", 0, 3),
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BitField("s", 1, 1),
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ByteField("ttl", 0)]
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class BIER(Packet):
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name = "BIER"
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fields_desc = [BitField("id", 5, 4),
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BitField("version", 0, 4),
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BitFieldLenField("length", BIERLength.BIER_LEN_256, 4,
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length_of=lambda x:(x.BitString >> 8)),
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BitField("entropy", 0, 20),
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BitField("OAM", 0, 2),
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BitField("RSV", 0, 2),
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BitField("DSCP", 0, 6),
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BitEnumField("Proto", 2, 6, BIERnhcls),
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ShortField("BFRID", 0),
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StrLenField("BitString",
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"",
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length_from=lambda x:(8 << x.length))]
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bind_layers(BIER, IP, Proto=4)
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bind_layers(BIER, IPv6, Proto=5)
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bind_layers(UDP, BIFT, dport=8138)
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bind_layers(BIFT, BIER)
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