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
|
#!/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 that sends a UDP datagram and checks if IPv4 addresses
are correctly translate to IPv6 addresses."""
import sys
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from ipaddress import ip_address
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def _check_udp_checksum(pkt):
"""Check UDP checksum in IP packet. Return True if checksum is correct
else False."""
new = pkt.__class__(str(pkt))
del new['UDP'].chksum
new = new.__class__(str(new))
return new['UDP'].chksum == pkt['UDP'].chksum
def _is_udp_in_ipv6(pkt):
"""If IPv6 next header type in the given pkt is UDP, return True,
else return False. False is returned also if exception occurs."""
ipv6_type = int('0x86dd', 16) # IPv6
try:
if pkt.type == ipv6_type:
if pkt.payload.nh == 17: # UDP
return True
except AttributeError:
return False
return False
def main(): # pylint: disable=too-many-statements, too-many-locals
"""Main function of the script file."""
args = TrafficScriptArg(['tx_dst_mac', 'tx_src_ipv4', 'tx_dst_ipv4',
'tx_dst_udp_port', 'rx_dst_mac', 'rx_src_mac',
'rx_src_ipv6', 'rx_dst_ipv6'])
rx_if = args.get_arg('rx_if')
tx_if = args.get_arg('tx_if')
tx_dst_mac = args.get_arg('tx_dst_mac')
tx_src_ipv4 = args.get_arg('tx_src_ipv4')
tx_dst_ipv4 = args.get_arg('tx_dst_ipv4')
tx_dst_udp_port = int(args.get_arg('tx_dst_udp_port'))
tx_src_udp_port = 20000
rx_dst_mac = args.get_arg('rx_dst_mac')
rx_src_mac = args.get_arg('rx_src_mac')
rx_src_ipv6 = args.get_arg('rx_src_ipv6')
rx_dst_ipv6 = args.get_arg('rx_dst_ipv6')
rxq = RxQueue(rx_if)
txq = TxQueue(tx_if)
sent_packets = []
# Create empty UDP datagram
udp = (Ether(dst=tx_dst_mac) /
IP(src=tx_src_ipv4, dst=tx_dst_ipv4) /
UDP(sport=tx_src_udp_port, dport=tx_dst_udp_port) /
'udp_payload')
txq.send(udp)
sent_packets.append(udp)
for _ in range(5):
pkt = rxq.recv(2)
if _is_udp_in_ipv6(pkt):
ether = pkt
break
else:
raise RuntimeError("UDP in IPv6 Rx error.")
# check ethernet
if ether.dst != rx_dst_mac:
raise RuntimeError("Destination MAC error {} != {}.".
format(ether.dst, rx_dst_mac))
print "Destination MAC: OK."
if ether.src != rx_src_mac:
raise RuntimeError("Source MAC error {} != {}.".
format(ether.src, rx_src_mac))
print "Source MAC: OK."
ipv6 = ether.payload
# check ipv6
if ip_address(unicode(ipv6.dst)) != ip_address(unicode(rx_dst_ipv6)):
raise RuntimeError("Destination IP error {} != {}.".
format(ipv6.dst, rx_dst_ipv6))
print "Destination IPv6: OK."
if ip_address(unicode(ipv6.src)) != ip_address(unicode(rx_src_ipv6)):
raise RuntimeError("Source IP error {} != {}.".
format(ipv6.src, rx_src_ipv6))
print "Source IPv6: OK."
udp = ipv6.payload
# check udp
if udp.dport != tx_dst_udp_port:
raise RuntimeError("UDP dport error {} != {}.".
format(udp.dport, tx_dst_udp_port))
print "UDP dport: OK."
if udp.sport != tx_src_udp_port:
raise RuntimeError("UDP sport error {} != {}.".
format(udp.sport, tx_src_udp_port))
print "UDP sport: OK."
if not _check_udp_checksum(ipv6):
raise RuntimeError("UDP checksum error.")
print "UDP checksum OK."
sys.exit(0)
if __name__ == "__main__":
main()
|
