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