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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 that sends an empty IPv4 UDP datagram encapsulated in IPv6
and checks if is correctly re-encapsulated."""
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_ipv4_in_ipv6(pkt):
"""If IPv6 next header type in the given pkt is IPv4, 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 == 4:
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_dst_ipv6', 'tx_src_ipv6',
'tx_dst_ipv4', 'tx_src_ipv4',
'tx_dst_udp_port', 'tx_src_udp_port',
'rx_dst_mac', 'rx_src_mac',
'rx_dst_ipv6', 'rx_src_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_mac = '02:00:00:00:00:01'
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_dst_udp_port = int(args.get_arg('tx_dst_udp_port'))
tx_src_udp_port = int(args.get_arg('tx_src_udp_port'))
rx_dst_mac = args.get_arg('rx_dst_mac')
rx_src_mac = args.get_arg('rx_src_mac')
rx_dst_ipv6 = args.get_arg('rx_dst_ipv6')
rx_src_ipv6 = args.get_arg('rx_src_ipv6')
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)
tx_pkt /= IPv6(src=tx_src_ipv6, dst=tx_dst_ipv6)
tx_pkt /= IP(src=tx_src_ipv4, dst=tx_dst_ipv4)
tx_pkt /= UDP(sport=tx_src_udp_port, dport=tx_dst_udp_port)
tx_pkt /= 'udp_payload'
txq.send(tx_pkt)
sent_packets.append(tx_pkt)
for _ in range(5):
pkt = rxq.recv(2, ignore=sent_packets)
if _is_ipv4_in_ipv6(pkt):
ether = pkt
break
else:
raise RuntimeError("IPv4 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 ipv6.dst != rx_dst_ipv6:
raise RuntimeError("Destination IPv6 error {} != {}.".
format(ipv6.dst, rx_dst_ipv6))
print "Destination IPv6: OK."
if ipv6.src != rx_src_ipv6:
raise RuntimeError("Source IPv6 error {} != {}.".
format(ipv6.src, rx_src_ipv6))
print "Source IPv6: OK."
ipv4 = ipv6.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()
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