1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
#!/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.PacketVerifier import RxQueue, TxQueue, auto_pad
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
from resources.libraries.python.telemetry.IPFIXUtil import IPFIXHandler
from resources.libraries.python.telemetry.IPFIXUtil import IPFIXData
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 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']
)
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')
source_port = int(args.get_arg('port'))
destination_port = int(args.get_arg('port'))
count = int(args.get_arg('count'))
txq = TxQueue(tx_if)
rxq = RxQueue(tx_if)
# generate simple packet based on arguments
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:
raise ValueError("Invalid IP version!")
if protocol.upper() == 'TCP':
protocol = TCP
elif protocol.upper() == 'UDP':
protocol = UDP
else:
raise ValueError("Invalid type of protocol!")
pkt_raw = (Ether(src=src_mac, dst=dst_mac) /
ip_version(src=src_ip, dst=dst_ip) /
protocol(sport=int(source_port),
dport=int(destination_port)))
# do not print details for sent packets when sending more than one
if count > 1:
verbose = False
print("Sending more than one packet. Details will be filtered for "
"all packets sent.")
else:
verbose = True
pkt_pad = auto_pad(pkt_raw)
ignore = []
for _ in range(count):
txq.send(pkt_pad, verbose=verbose)
ignore.append(pkt_pad)
# allow scapy to recognize IPFIX headers and templates
ipfix = IPFIXHandler()
data = None
# get IPFIX template and data
while True:
pkt = rxq.recv(10, ignore=ignore, verbose=verbose)
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"):
data = pkt.getlayer(IPFIXData).fields
break
else:
raise RuntimeError("Unable to parse IPFIX set after header.")
else:
raise RuntimeError("Received non-IPFIX packet or IPFIX header "
"not recognized.")
# 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()
err = "{0} mismatch. Packets used {1}, but were classified as {2}."
if ip_version == IP:
if "IPv4_src" in keys:
if data["IPv4_src"] != src_ip:
raise RuntimeError(
err.format("Source IP", src_ip, data["IPv4_src"]))
if "IPv4_dst" in keys:
if data["IPv4_dst"] != dst_ip:
raise RuntimeError(
err.format("Destination IP", dst_ip, data["IPv4_dst"]))
else:
if "IPv6_src" in keys:
if data["IPv6_src"] != src_ip:
raise RuntimeError(
err.format("Source IP", src_ip, data["IPv6_src"]))
if "IPv6_dst" in keys:
if data["IPv6_dst"] != dst_ip:
raise RuntimeError(
err.format("Source IP", src_ip, data["IPv6_dst"]))
# verify port numbers
for item in ("src_port", "tcp_src_port", "udp_src_port"):
try:
if int(data[item]) != source_port:
raise RuntimeError(
err.format("Source port", source_port, data[item]))
except KeyError:
pass
for item in ("dst_port", "tcp_dst_port", "udp_dst_port"):
try:
if int(data[item]) != destination_port:
raise RuntimeError(
err.format("Source port", destination_port, data[item]))
except KeyError:
pass
# 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.")
sys.exit(0)
if __name__ == "__main__":
main()
|
