Your IP : 216.73.216.79
# 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 = Bit Index Explicit Replication (BIER)
# scapy.contrib.status = loads
from scapy.packet import Packet, bind_layers
from scapy.fields import BitEnumField, BitField, BitFieldLenField, ByteField, \
ShortField, StrLenField
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
class BIERLength:
BIER_LEN_64 = 0
BIER_LEN_128 = 1
BIER_LEN_256 = 2
BIER_LEN_512 = 3
BIER_LEN_1024 = 4
BIERnhcls = {1: "MPLS",
2: "MPLS",
4: "IPv4",
5: "IPv6"}
class BIFT(Packet):
name = "BIFT"
fields_desc = [BitField("bsl", BIERLength.BIER_LEN_256, 4),
BitField("sd", 0, 8),
BitField("set", 0, 8),
BitField("cos", 0, 3),
BitField("s", 1, 1),
ByteField("ttl", 0)]
class BIER(Packet):
name = "BIER"
fields_desc = [BitField("id", 5, 4),
BitField("version", 0, 4),
BitFieldLenField("length", BIERLength.BIER_LEN_256, 4,
length_of=lambda x:(x.BitString >> 8)),
BitField("entropy", 0, 20),
BitField("OAM", 0, 2),
BitField("RSV", 0, 2),
BitField("DSCP", 0, 6),
BitEnumField("Proto", 2, 6, BIERnhcls),
ShortField("BFRID", 0),
StrLenField("BitString",
"",
length_from=lambda x:(8 << x.length))]
bind_layers(BIER, IP, Proto=4)
bind_layers(BIER, IPv6, Proto=5)
bind_layers(UDP, BIFT, dport=8138)
bind_layers(BIFT, BIER)