+#!/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 an empty IPv4 UDP datagram encapsulated in IPv6
+and checks if is correctly decapsulated."""
+
+import sys
+
+from scapy.layers.l2 import Ether
+from scapy.layers.inet6 import IPv6
+from scapy.layers.inet import IP, UDP
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def _is_udp_in_ipv4(pkt):
+ """If UDP is in IPv4 packet return True,
+ else return False. False is returned also if exception occurs."""
+ ipv4_type = int('0x0800', 16) # IPv4
+ try:
+ if pkt.type == ipv4_type:
+ if pkt.payload.proto == 17: # UDP
+ return True
+ except: # pylint: disable=bare-except
+ 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_mac',
+ 'tx_dst_ipv6', 'tx_src_ipv6',
+ 'tx_dst_ipv4', 'tx_src_ipv4', 'tx_src_udp_port',
+ 'rx_dst_mac', 'rx_src_mac'])
+ rx_if = args.get_arg('rx_if')
+ tx_if = args.get_arg('tx_if')
+ tx_src_mac = args.get_arg('tx_src_mac')
+ tx_dst_mac = args.get_arg('tx_dst_mac')
+ tx_dst_ipv6 = args.get_arg('tx_dst_ipv6')
+ tx_src_ipv6 = args.get_arg('tx_src_ipv6')
+ tx_dst_ipv4 = args.get_arg('tx_dst_ipv4')
+ tx_src_ipv4 = args.get_arg('tx_src_ipv4')
+ tx_src_udp_port = int(args.get_arg('tx_src_udp_port'))
+ tx_dst_udp_port = 20000
+ rx_dst_mac = args.get_arg('rx_dst_mac')
+ rx_src_mac = args.get_arg('rx_src_mac')
+
+ rxq = RxQueue(rx_if)
+ txq = TxQueue(tx_if)
+ sent_packets = []
+
+ # Create empty UDP datagram in IPv4 and IPv6
+ tx_pkt = (Ether(dst=tx_dst_mac, src=tx_src_mac) /
+ IPv6(src=tx_src_ipv6, dst=tx_dst_ipv6) /
+ IP(src=tx_src_ipv4, dst=tx_dst_ipv4) /
+ UDP(sport=tx_src_udp_port, dport=tx_dst_udp_port))
+
+ txq.send(tx_pkt)
+ sent_packets.append(tx_pkt)
+
+ for _ in range(5):
+ pkt = rxq.recv(2)
+ if _is_udp_in_ipv4(pkt):
+ ether = pkt
+ break
+ else:
+ raise RuntimeError("UDP in IPv4 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."
+
+ ipv4 = ether.payload
+
+ # check ipv4
+ if ipv4.dst != tx_dst_ipv4:
+ raise RuntimeError("Destination IPv4 error {} != {}.".
+ format(ipv4.dst, tx_dst_ipv4))
+ print "Destination IPv4: OK."
+
+ if ipv4.src != tx_src_ipv4:
+ raise RuntimeError("Source IPv4 error {} != {}.".
+ format(ipv4.src, tx_src_ipv4))
+ print "Source IPv4: OK."
+
+ if ipv4.proto != 17: # UDP
+ raise RuntimeError("IPv4 protocol error {} != UDP.".
+ format(ipv4.proto))
+ print "IPv4 protocol: OK."
+
+ udp = ipv4.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."
+
+ sys.exit(0)
+
+if __name__ == "__main__":
+ main()
Code Review / csit.git / commitdiff