cbcc84ba66
Change-Id: I4953b8444b49d1ad445c98a199ae8fd1635e24a5 Signed-off-by: Neale Ranns <nranns@cisco.com>
63 lines
1.8 KiB
Diff
63 lines
1.8 KiB
Diff
diff --git a/scapy/contrib/bier.py b/scapy/contrib/bier.py
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new file mode 100644
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index 0000000..e173cdb
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--- /dev/null
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+++ b/scapy/contrib/bier.py
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@@ -0,0 +1,56 @@
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+# http://trac.secdev.org/scapy/ticket/31
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+
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+# scapy.contrib.description = BIER
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+# scapy.contrib.status = loads
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+
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+from scapy.packet import *
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+from scapy.fields import *
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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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+
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+
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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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+
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+
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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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+
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+
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+class BIFT(Packet):
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+ name = "BIFT"
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+ fields_desc = [BitField("bsl", 0, 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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+
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+
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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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+
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+
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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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