2 # Copyright (c) 2016 Cisco and/or its affiliates.
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at:
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
15 """Traffic script that sends a UDP datagram and checks if IPv4 addresses
16 are correctly translate to IPv6 addresses."""
20 from scapy.layers.l2 import Ether
21 from scapy.layers.inet import IP, UDP
22 from ipaddress import ip_address
24 from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
25 from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
28 def _check_udp_checksum(pkt):
29 """Check UDP checksum in IP packet. Return True if checksum is correct
31 new = pkt.__class__(str(pkt))
33 new = new.__class__(str(new))
34 return new['UDP'].chksum == pkt['UDP'].chksum
37 def _is_udp_in_ipv6(pkt):
38 """If IPv6 next header type in the given pkt is UDP, return True,
39 else return False. False is returned also if exception occurs."""
40 ipv6_type = int('0x86dd', 16) # IPv6
42 if pkt.type == ipv6_type:
43 if pkt.payload.nh == 17: # UDP
45 except AttributeError:
50 def main(): # pylint: disable=too-many-statements, too-many-locals
51 """Main function of the script file."""
52 args = TrafficScriptArg(['tx_dst_mac', 'tx_src_ipv4', 'tx_dst_ipv4',
53 'tx_dst_udp_port', 'rx_dst_mac', 'rx_src_mac',
54 'rx_src_ipv6', 'rx_dst_ipv6'])
55 rx_if = args.get_arg('rx_if')
56 tx_if = args.get_arg('tx_if')
57 tx_dst_mac = args.get_arg('tx_dst_mac')
58 tx_src_ipv4 = args.get_arg('tx_src_ipv4')
59 tx_dst_ipv4 = args.get_arg('tx_dst_ipv4')
60 tx_dst_udp_port = int(args.get_arg('tx_dst_udp_port'))
61 tx_src_udp_port = 20000
62 rx_dst_mac = args.get_arg('rx_dst_mac')
63 rx_src_mac = args.get_arg('rx_src_mac')
64 rx_src_ipv6 = args.get_arg('rx_src_ipv6')
65 rx_dst_ipv6 = args.get_arg('rx_dst_ipv6')
71 # Create empty UDP datagram
72 udp = (Ether(dst=tx_dst_mac) /
73 IP(src=tx_src_ipv4, dst=tx_dst_ipv4) /
74 UDP(sport=tx_src_udp_port, dport=tx_dst_udp_port) /
78 sent_packets.append(udp)
82 if _is_udp_in_ipv6(pkt):
86 raise RuntimeError("UDP in IPv6 Rx error.")
89 if ether.dst != rx_dst_mac:
90 raise RuntimeError("Destination MAC error {} != {}.".
91 format(ether.dst, rx_dst_mac))
92 print "Destination MAC: OK."
94 if ether.src != rx_src_mac:
95 raise RuntimeError("Source MAC error {} != {}.".
96 format(ether.src, rx_src_mac))
97 print "Source MAC: OK."
102 if ip_address(unicode(ipv6.dst)) != ip_address(unicode(rx_dst_ipv6)):
103 raise RuntimeError("Destination IP error {} != {}.".
104 format(ipv6.dst, rx_dst_ipv6))
105 print "Destination IPv6: OK."
107 if ip_address(unicode(ipv6.src)) != ip_address(unicode(rx_src_ipv6)):
108 raise RuntimeError("Source IP error {} != {}.".
109 format(ipv6.src, rx_src_ipv6))
110 print "Source IPv6: OK."
115 if udp.dport != tx_dst_udp_port:
116 raise RuntimeError("UDP dport error {} != {}.".
117 format(udp.dport, tx_dst_udp_port))
118 print "UDP dport: OK."
120 if udp.sport != tx_src_udp_port:
121 raise RuntimeError("UDP sport error {} != {}.".
122 format(udp.sport, tx_src_udp_port))
123 print "UDP sport: OK."
125 if not _check_udp_checksum(ipv6):
126 raise RuntimeError("UDP checksum error.")
127 print "UDP checksum OK."
131 if __name__ == "__main__":