resources/traffic_scripts/ipv6_sweep_ping.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 IPv6 sweep ping."""
  17
  18 import logging
  19 import os
  20 import sys
  21
  22 logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
  23 from resources.libraries.python.PacketVerifier import RxQueue, TxQueue, \
  24     checksum_equal
  25 from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
  26 from scapy.layers.inet6 import IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr
  27 from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply
  28 from scapy.all import Ether
  29
  30
  31 def main():
  32     # start_size - start size of the ICMPv6 echo data
  33     # end_size - end size of the ICMPv6 echo data
  34     # step - increment step
  35     args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_ip', 'dst_ip',
  36                              'start_size', 'end_size', 'step'])
  37
  38     rxq = RxQueue(args.get_arg('rx_if'))
  39     txq = TxQueue(args.get_arg('tx_if'))
  40
  41     src_mac = args.get_arg('src_mac')
  42     dst_mac = args.get_arg('dst_mac')
  43     src_ip = args.get_arg('src_ip')
  44     dst_ip = args.get_arg('dst_ip')
  45     start_size = int(args.get_arg('start_size'))
  46     end_size = int(args.get_arg('end_size'))
  47     step = int(args.get_arg('step'))
  48     echo_id = 0xa
  49     # generate some random data buffer
  50     data = bytearray(os.urandom(end_size))
  51
  52     # send ICMPv6 neighbor advertisement message
  53     sent_packets = []
  54     pkt_send = (Ether(src=src_mac, dst=dst_mac) /
  55                 IPv6(src=src_ip, dst=dst_ip) /
  56                 ICMPv6ND_NA(tgt=src_ip, R=0) /
  57                 ICMPv6NDOptDstLLAddr(lladdr=src_mac))
  58     sent_packets.append(pkt_send)
  59     txq.send(pkt_send)
  60
  61     # send ICMPv6 echo request with incremented data length and receive ICMPv6
  62     # echo reply
  63     for echo_seq in range(start_size, end_size + 1, step):
  64         pkt_send = (Ether(src=src_mac, dst=dst_mac) /
  65                     IPv6(src=src_ip, dst=dst_ip) /
  66                     ICMPv6EchoRequest(id=echo_id, seq=echo_seq,
  67                                       data=data[0:echo_seq]))
  68         sent_packets.append(pkt_send)
  69         txq.send(pkt_send)
  70
  71         ether = rxq.recv(ignore=sent_packets)
  72         if ether is None:
  73             raise RuntimeError(
  74                 'ICMPv6 echo reply seq {0} Rx timeout'.format(echo_seq))
  75
  76         if not ether.haslayer(IPv6):
  77             raise RuntimeError(
  78                 'Unexpected packet with no IPv6 received {0}'.format(
  79                     ether.__repr__()))
  80
  81         ipv6 = ether['IPv6']
  82
  83         if not ipv6.haslayer(ICMPv6EchoReply):
  84             raise RuntimeError(
  85                 'Unexpected packet with no IPv6 ICMP received {0}'.format(
  86                     ipv6.__repr__()))
  87
  88         icmpv6 = ipv6['ICMPv6 Echo Reply']
  89
  90         if icmpv6.id != echo_id or icmpv6.seq != echo_seq:
  91             raise RuntimeError(
  92                 'Invalid ICMPv6 echo reply received ID {0} seq {1} should be '
  93                 'ID {2} seq {3}, {0}'.format(icmpv6.id, icmpv6.seq, echo_id,
  94                                              echo_seq))
  95
  96         cksum = icmpv6.cksum
  97         del icmpv6.cksum
  98         tmp = ICMPv6EchoReply(str(icmpv6))
  99         if not checksum_equal(tmp.cksum, cksum):
 100             raise RuntimeError(
 101                 'Invalid checksum {0} should be {1}'.format(cksum, tmp.cksum))
 102
 103         sent_packets.remove(pkt_send)
 104
 105     sys.exit(0)
 106
 107
 108 if __name__ == "__main__":
 109     main()