CSIT-235: Switched Port Analyzer mirroring (SPAN) - IPv4

[csit.git] / resources / libraries / python / telemetry / IPFIXUtil.py

diff --git a/resources/libraries/python/telemetry/IPFIXUtil.py b/resources/libraries/python/telemetry/IPFIXUtil.py
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+++ b/resources/libraries/python/telemetry/IPFIXUtil.py
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+# Copyright (c) 2016 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""IPFIX utilities library. Provides classes that allow scapy to work
+with IPFIX packets.
+
+ Note:
+ Template and data sets in one packet are not supported.
+ Option template sets (Set_ID = 3) are not supported.
+  """
+
+
+from scapy.all import Packet, bind_layers
+from scapy.fields import ByteField, ShortField, IntField, LongField, IPField,\
+    StrFixedLenField, FieldListField
+from scapy.layers.inet import UDP
+from scapy.layers.inet6 import IP6Field
+from scapy.contrib.ppi_geotag import UTCTimeField
+
+
+class IPFIXHandler(object):
+    """Class for handling IPFIX packets. To use, create instance of class before
+     dissecting IPFIX packets with scapy, then run update_template every time
+     an IPFIX template packet is received."""
+
+    template_elements = {
+        4: ByteField("Protocol_ID", 0x00),
+        7: ShortField("src_port", 0),
+        8: IPField("IPv4_src", ""),
+        11: ShortField("dst_port", 0),
+        12: IPField("IPv4_dst", ""),
+        27: IP6Field("IPv6_src", "::"),
+        28: IP6Field("IPv6_dst", "::"),
+        86: LongField("packetTotalCount", 0),
+        180: ShortField("udp_src_port", 0),
+        181: ShortField("udp_dst_port", 0),
+        182: ShortField("tcp_src_port", 0),
+        183: ShortField("tcp_dst_port", 0),
+        193: ByteField("Next_header", 0x00)
+    }
+
+    def __init__(self):
+        """Initializer, registers IPFIX header and template layers with scapy.
+        """
+        bind_layers(UDP, IPFIXHeader, dport=4739)
+        bind_layers(IPFIXHeader, IPFIXTemplate, Set_ID=2)
+
+    def update_template(self, packet):
+        """Updates IPFIXData class with new data template. Registers IPFIX data
+        layer with scapy using the new template.
+
+        :param packet: Packet containing an IPFIX template.
+        :type packet: scapy.Ether
+        """
+        template_list = packet['IPFIX template'].Template
+        template_id = packet['IPFIX template'].Template_ID
+
+        IPFIXData.fields_desc = []
+        for item in template_list[::2]:
+            try:
+                IPFIXData.fields_desc.append(self.template_elements[item])
+            except KeyError:
+                raise KeyError(
+                    "Unknown IPFIX template element with ID {0}".format(item))
+        bind_layers(IPFIXHeader, IPFIXData, Set_ID=template_id)
+        # if the packet doesn't end here, assume it contains more data sets
+        bind_layers(IPFIXData, IPFIXData)
+
+
+class IPFIXHeader(Packet):
+    """Class for IPFIX header."""
+    name = "IPFIX header"
+    fields_desc = [StrFixedLenField("Version", 0x000a, length=2),
+                   ShortField("Message Length", 0),
+                   UTCTimeField("Timestamp(UTC)", ""),
+                   IntField("Sequence Number", 0),
+                   IntField("Observation Domain ID", 0),
+                   ShortField("Set_ID", 0),
+                   ShortField("Set_Length", 0)
+                   ]
+
+
+class IPFIXTemplate(Packet):
+    """Class for IPFIX template layer."""
+    name = "IPFIX template"
+    fields_desc = [ShortField("Template_ID", 256),
+                   ShortField("nFields", 2),
+                   FieldListField("Template", [], ShortField("type_len", ""),
+                                  count_from=lambda p: p.nFields*2)
+                   ]
+
+
+class IPFIXData(Packet):
+    """Class for IPFIX data layer. Needs to be updated with
+    a template before use."""
+    name = "IPFIX flow data"
+    fields_desc = []