[dts] [PATCH V1 2/3][nsh] dep: add support of mpls and nsh
lihong
lihongx.ma at intel.com
Fri Oct 11 02:25:05 CEST 2019
Signed-off-by: lihong <lihongx.ma at intel.com>
---
dep/mpls.py | 24 ++++++++++++++++++++++
dep/nsh.py | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 91 insertions(+)
create mode 100644 dep/mpls.py
create mode 100644 dep/nsh.py
diff --git a/dep/mpls.py b/dep/mpls.py
new file mode 100644
index 0000000..0b37bba
--- /dev/null
+++ b/dep/mpls.py
@@ -0,0 +1,24 @@
+from scapy.packet import Packet, bind_layers, Padding
+from scapy.fields import BitField,ByteField
+from scapy.layers.inet import IP
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether, GRE
+
+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:
+ ip_version = (ord(payload[0]) >> 4) & 0xF
+ if ip_version == 4:
+ return IP
+ elif ip_version == 6:
+ return IPv6
+ return Padding
+
+bind_layers(Ether, MPLS, type=0x8847)
+bind_layers(GRE, MPLS, proto=0x8847)
diff --git a/dep/nsh.py b/dep/nsh.py
new file mode 100644
index 0000000..2e249c9
--- /dev/null
+++ b/dep/nsh.py
@@ -0,0 +1,67 @@
+from scapy.packet import *
+from scapy.fields import *
+from scapy.layers.inet import Ether, IP
+from scapy.layers.inet6 import IPv6
+from vxlan import VXLAN
+from mpls import MPLS
+
+
+class Metadata(Packet):
+ name = 'NSH metadata'
+ fields_desc = [XIntField('value', 0)]
+
+
+class NSHTLV(Packet):
+ "NSH MD-type 2 - Variable Length Context Headers"
+ name = "NSHTLV"
+ fields_desc = [
+ ShortField('Class', 0),
+ BitField('Critical', 0, 1),
+ BitField('Type', 0, 7),
+ BitField('Reserved', 0, 3),
+ BitField('Len', 0, 5),
+ PacketListField('Metadata', None, XIntField, count_from='Len')
+ ]
+
+
+class NSH(Packet):
+ """Network Service Header.
+ NSH MD-type 1 if there is no ContextHeaders"""
+ name = "NSH"
+
+ fields_desc = [
+ BitField('Ver', 0, 2),
+ BitField('OAM', 0, 1),
+ BitField('Critical', 0, 1),
+ BitField('Reserved', 0, 6),
+ BitField('Len', 0, 6),
+ ByteEnumField('MDType', 1, {1: 'Fixed Length',
+ 2: 'Variable Length'}),
+ ByteEnumField('NextProto', 3, {1: 'IPv4',
+ 2: 'IPv6',
+ 3: 'Ethernet',
+ 4: 'NSH',
+ 5: 'MPLS'}),
+ X3BytesField('NSP', 0),
+ ByteField('NSI', 1),
+ ConditionalField(XIntField('NPC', 0), lambda pkt: pkt.MDType == 1),
+ ConditionalField(XIntField('NSC', 0), lambda pkt: pkt.MDType == 1),
+ ConditionalField(XIntField('SPC', 0), lambda pkt: pkt.MDType == 1),
+ ConditionalField(XIntField('SSC', 0), lambda pkt: pkt.MDType == 1),
+ ConditionalField(PacketListField("ContextHeaders", None,
+ NSHTLV, count_from="Length"),
+ lambda pkt: pkt.MDType == 2)
+ ]
+
+ def mysummary(self):
+ return self.sprintf("NSP: %NSP% - NSI: %NSI%")
+
+
+bind_layers(Ether, NSH, {'type': 0x894F}, type=0x894F)
+bind_layers(VXLAN, NSH, {'flags': 0xC, 'NextProtocol': 4}, NextProtocol=4)
+
+bind_layers(NSH, IP, {'NextProto': 1}, NextProto=1)
+bind_layers(NSH, IPv6, {'NextProto': 2}, NextProto=2)
+bind_layers(NSH, Ether, {'NextProto': 3}, NextProto=3)
+bind_layers(NSH, NSH, {'NextProto': 4}, NextProto=4)
+bind_layers(NSH, MPLS, {'NextProto': 5}, NextProto=5)
--
2.7.4
More information about the dts
mailing list