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#!/usr/bin/env python
# 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.
"""Traffic script - IPFIX listener."""
import sys
from ipaddress import IPv4Address, IPv6Address, AddressValueError
from scapy.layers.inet import IP, TCP, UDP
from scapy.layers.inet6 import IPv6
from scapy.layers.l2 import Ether
from resources.libraries.python.telemetry.IPFIXUtil import IPFIXHandler, \
IPFIXData
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue, auto_pad
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def valid_ipv4(ip):
"""Check if IP address has the correct IPv4 address format.
:param ip: IP address.
:type ip: str
:return: True in case of correct IPv4 address format,
otherwise return false.
:rtype: bool
"""
try:
IPv4Address(unicode(ip))
return True
except (AttributeError, AddressValueError):
return False
def valid_ipv6(ip):
"""Check if IP address has the correct IPv6 address format.
:param ip: IP address.
:type ip: str
:return: True in case of correct IPv6 address format,
otherwise return false.
:rtype: bool
"""
try:
IPv6Address(unicode(ip))
return True
except (AttributeError, AddressValueError):
return False
def verify_data(data, count, src_ip, dst_ip, protocol):
"""Compare data in IPFIX flow report against parameters used to send test
packets.
:param data: Dictionary of fields in IPFIX flow report.
:param count: Number of packets expected.
:param src_ip: Expected source IP address.
:param dst_ip: Expected destination IP address.
:param protocol: Expected protocol, TCP or UDP.
:type data: dict
:type count: int
:type src_ip: str
:type dst_ip: str
:type protocol: scapy.layers
"""
# verify packet count
if data["packetTotalCount"] != count:
raise RuntimeError(
"IPFIX reported wrong packet count. Count was {0},"
" but should be {1}".format(data["packetTotalCount"], count))
# verify IP addresses
keys = data.keys()
e = "{0} mismatch. Packets used {1}, but were classified as {2}."
if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
if "IPv4_src" in keys:
if data["IPv4_src"] != src_ip:
raise RuntimeError(
e.format("Source IP", src_ip, data["IPv4_src"]))
if "IPv4_dst" in keys:
if data["IPv4_dst"] != dst_ip:
raise RuntimeError(
e.format("Destination IP", dst_ip, data["IPv4_dst"]))
else:
if "IPv6_src" in keys:
if data["IPv6_src"] != src_ip:
raise RuntimeError(
e.format("Source IP", src_ip, data["IPv6_src"]))
if "IPv6_dst" in keys:
if data["IPv6_dst"] != dst_ip:
raise RuntimeError(
e.format("Source IP", src_ip, data["IPv6_dst"]))
# verify protocol ID
if "Protocol_ID" in keys:
if protocol == TCP and int(data["Protocol_ID"]) != 6:
raise RuntimeError(
"TCP Packets were classified as not TCP.")
if protocol == UDP and int(data["Protocol_ID"]) != 17:
raise RuntimeError(
"UDP Packets were classified as not UDP.")
# return port number
for item in ("src_port", "tcp_src_port", "udp_src_port",
"dst_port", "tcp_dst_port", "udp_dst_port"):
if item in keys:
return int(data[item])
else:
raise RuntimeError("Data contains no port information.")
def main():
"""Send packets to VPP, then listen for IPFIX flow report. Verify that
the correct packet count was reported."""
args = TrafficScriptArg(
['src_mac', 'dst_mac', 'src_ip', 'dst_ip', 'protocol', 'port', 'count',
'sessions']
)
dst_mac = args.get_arg('dst_mac')
src_mac = args.get_arg('src_mac')
src_ip = args.get_arg('src_ip')
dst_ip = args.get_arg('dst_ip')
tx_if = args.get_arg('tx_if')
protocol = args.get_arg('protocol')
count = int(args.get_arg('count'))
sessions = int(args.get_arg('sessions'))
txq = TxQueue(tx_if)
rxq = RxQueue(tx_if)
# generate simple packet based on arguments
ip_version = None
if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
ip_version = IP
elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
ip_version = IPv6
else:
ValueError("Invalid IP version!")
if protocol.upper() == 'TCP':
protocol = TCP
elif protocol.upper() == 'UDP':
protocol = UDP
else:
raise ValueError("Invalid type of protocol!")
packets = []
for x in range(sessions):
pkt = (Ether(src=src_mac, dst=dst_mac) /
ip_version(src=src_ip, dst=dst_ip) /
protocol(sport=x, dport=x))
pkt = auto_pad(pkt)
packets.append(pkt)
# do not print details for sent packets
verbose = False
print("Sending more than one packet. Details will be filtered for "
"all packets sent.")
ignore = []
for x in range(sessions):
for _ in range(count):
txq.send(packets[x], verbose=verbose)
ignore.append(packets[x])
# allow scapy to recognize IPFIX headers and templates
ipfix = IPFIXHandler()
# clear receive buffer
while True:
pkt = rxq.recv(1, ignore=packets, verbose=verbose)
if pkt is None:
break
data = None
ports = [x for x in range(sessions)]
# get IPFIX template and data
while True:
pkt = rxq.recv(5)
if pkt is None:
raise RuntimeError("RX timeout")
if pkt.haslayer("ICMPv6ND_NS"):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
if pkt.haslayer("IPFIXHeader"):
if pkt.haslayer("IPFIXTemplate"):
# create or update template for IPFIX data packets
ipfix.update_template(pkt)
elif pkt.haslayer("IPFIXData"):
for x in range(sessions):
try:
data = pkt.getlayer(IPFIXData, x+1).fields
except AttributeError:
raise RuntimeError("Could not find data layer "
"#{0}".format(x+1))
port = verify_data(data, count, src_ip, dst_ip, protocol)
if port in ports:
ports.remove(port)
else:
raise RuntimeError("Unexpected or duplicate port {0} "
"in flow report.".format(port))
print("All {0} sessions verified "
"with packet count {1}.".format(sessions, count))
sys.exit(0)
else:
raise RuntimeError("Unable to parse IPFIX template "
"or data set.")
else:
raise RuntimeError("Received non-IPFIX packet or IPFIX header was"
"not recognized.")
if __name__ == "__main__":
main()
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