resources/traffic_scripts/icmpv6_echo.py

   1 #!/usr/bin/env python
   2
   3 # Copyright (c) 2016 Cisco and/or its affiliates.
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at:
   7 #
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 """Traffic script for ICMPv6 echo test."""
  17
  18 import sys
  19 import logging
  20 logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
  21 from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
  22 from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
  23 from scapy.layers.inet6 import IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr
  24 from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply
  25 from scapy.all import Ether
  26
  27
  28 def main():
  29     args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip'])
  30
  31     rxq = RxQueue(args.get_arg('rx_if'))
  32     txq = TxQueue(args.get_arg('tx_if'))
  33
  34     src_mac = args.get_arg('src_mac')
  35     dst_mac = args.get_arg('dst_mac')
  36     src_ip = args.get_arg('src_ip')
  37     dst_ip = args.get_arg('dst_ip')
  38     echo_id = 0xa
  39     echo_seq = 0x1
  40
  41     sent_packets = []
  42
  43     # send ICMPv6 neighbor advertisement message
  44     pkt_send = (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') /
  45                         IPv6(src=src_ip, dst='ff02::1:ff00:2') /
  46                         ICMPv6ND_NA(tgt=src_ip, R=0) /
  47                         ICMPv6NDOptDstLLAddr(lladdr=src_mac))
  48     sent_packets.append(pkt_send)
  49     txq.send(pkt_send)
  50
  51     # send ICMPv6 echo request
  52     pkt_send = (Ether(src=src_mac, dst=dst_mac) /
  53                         IPv6(src=src_ip, dst=dst_ip) /
  54                         ICMPv6EchoRequest(id=echo_id, seq=echo_seq))
  55     sent_packets.append(pkt_send)
  56     txq.send(pkt_send)
  57
  58     # receive ICMPv6 echo reply
  59     ether = rxq.recv(2, sent_packets)
  60     if ether is None:
  61         raise RuntimeError('ICMPv6 echo reply Rx timeout')
  62
  63     if not ether.haslayer(IPv6):
  64         raise RuntimeError('Unexpected packet with no IPv6 received {0}'.format(
  65             ether.__repr__()))
  66
  67     ipv6 = ether['IPv6']
  68
  69     if not ipv6.haslayer(ICMPv6EchoReply):
  70         raise RuntimeError(
  71             'Unexpected packet with no IPv6 ICMP received {0}'.format(
  72                 ipv6.__repr__()))
  73
  74     icmpv6 = ipv6['ICMPv6 Echo Reply']
  75
  76     # check identifier and sequence number
  77     if icmpv6.id != echo_id or icmpv6.seq != echo_seq:
  78         raise RuntimeError(
  79             'Invalid ICMPv6 echo reply received ID {0} seq {1} should be ' \
  80             'ID {2} seq {3}'.format(icmpv6.id, icmpv6.seq, echo_id, echo_seq))
  81
  82     # verify checksum
  83     cksum = icmpv6.cksum
  84     del icmpv6.cksum
  85     tmp = ICMPv6EchoReply(str(icmpv6))
  86     if tmp.cksum != cksum:
  87         raise RuntimeError(
  88             'Invalid checksum {0} should be {1}'.format(cksum, tmp.cksum))
  89
  90     sys.exit(0)
  91
  92 if __name__ == "__main__":
  93     main()