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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.
"""Send ICMPv6 echo request from one TG port to another through DUT nodes and
send reply back. Also verify hop limit processing."""
import sys
import logging
# pylint: disable=no-name-in-module
# pylint: disable=import-error
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.layers.inet6 import IPv6, ICMPv6ND_NA, ICMPv6ND_NS
from scapy.layers.inet6 import ICMPv6NDOptDstLLAddr
from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply
from scapy.all import Ether
from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
from resources.libraries.python.PacketVerifier import checksum_equal
from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
def main():
args = TrafficScriptArg(['src_mac', 'dst_mac', 'src_nh_mac', 'dst_nh_mac',
'src_ip', 'dst_ip', 'h_num'])
src_rxq = RxQueue(args.get_arg('rx_if'))
src_txq = TxQueue(args.get_arg('rx_if'))
dst_rxq = RxQueue(args.get_arg('tx_if'))
dst_txq = TxQueue(args.get_arg('tx_if'))
src_mac = args.get_arg('src_mac')
dst_mac = args.get_arg('dst_mac')
src_nh_mac = args.get_arg('src_nh_mac')
dst_nh_mac = args.get_arg('dst_nh_mac')
src_ip = args.get_arg('src_ip')
dst_ip = args.get_arg('dst_ip')
hop_num = int(args.get_arg('h_num'))
hop_limit = 64
echo_id = 0xa
echo_seq = 0x1
src_sent_packets = []
dst_sent_packets = []
# send ICMPv6 neighbor advertisement message
pkt_send = (Ether(src=src_mac, dst='ff:ff:ff:ff:ff:ff') /
IPv6(src=src_ip, dst='ff02::1:ff00:2') /
ICMPv6ND_NA(tgt=src_ip, R=0) /
ICMPv6NDOptDstLLAddr(lladdr=src_mac))
src_sent_packets.append(pkt_send)
src_txq.send(pkt_send)
pkt_send = (Ether(src=dst_mac, dst='ff:ff:ff:ff:ff:ff') /
IPv6(src=dst_ip, dst='ff02::1:ff00:2') /
ICMPv6ND_NA(tgt=dst_ip, R=0) /
ICMPv6NDOptDstLLAddr(lladdr=dst_mac))
dst_sent_packets.append(pkt_send)
dst_txq.send(pkt_send)
# send ICMPv6 echo request from first TG interface
pkt_send = (Ether(src=src_mac, dst=src_nh_mac) /
IPv6(src=src_ip, dst=dst_ip, hlim=hop_limit) /
ICMPv6EchoRequest(id=echo_id, seq=echo_seq))
src_sent_packets.append(pkt_send)
src_txq.send(pkt_send)
# receive ICMPv6 echo request on second TG interface
while True:
ether = dst_rxq.recv(2, dst_sent_packets)
if ether is None:
raise RuntimeError('ICMPv6 echo reply Rx timeout')
if ether.haslayer(ICMPv6ND_NS):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
else:
# otherwise process the current packet
break
if not ether.haslayer(IPv6):
raise RuntimeError('Unexpected packet with no IPv6 received: {0}'.
format(ether.__repr__()))
ipv6 = ether[IPv6]
# verify hop limit processing
if ipv6.hlim != (hop_limit - hop_num):
raise RuntimeError('Invalid hop limit {0} should be {1}'.
format(ipv6.hlim,hop_limit - hop_num))
if not ipv6.haslayer(ICMPv6EchoRequest):
raise RuntimeError('Unexpected packet with no IPv6 ICMP received {0}'.
format(ipv6.__repr__()))
icmpv6 = ipv6[ICMPv6EchoRequest]
# check identifier and sequence number
if icmpv6.id != echo_id or icmpv6.seq != echo_seq:
raise RuntimeError('Invalid ICMPv6 echo reply received ID {0} '
'seq {1} should be ID {2} seq {3}'.
format(icmpv6.id, icmpv6.seq, echo_id, echo_seq))
# verify checksum
cksum = icmpv6.cksum
del icmpv6.cksum
tmp = ICMPv6EchoRequest(str(icmpv6))
if not checksum_equal(tmp.cksum, cksum):
raise RuntimeError('Invalid checksum {0} should be {1}'.
format(cksum, tmp.cksum))
# send ICMPv6 echo reply from second TG interface
pkt_send = (Ether(src=dst_mac, dst=dst_nh_mac) /
IPv6(src=dst_ip, dst=src_ip) /
ICMPv6EchoReply(id=echo_id, seq=echo_seq))
dst_sent_packets.append(pkt_send)
dst_txq.send(pkt_send)
# receive ICMPv6 echo reply on first TG interface
while True:
ether = src_rxq.recv(2, src_sent_packets)
if ether is None:
raise RuntimeError('ICMPv6 echo reply Rx timeout')
if ether.haslayer(ICMPv6ND_NS):
# read another packet in the queue if the current one is ICMPv6ND_NS
continue
else:
# otherwise process the current packet
break
if not ether.haslayer(IPv6):
raise RuntimeError('Unexpected packet with no IPv6 layer received {0}'.
format(ether.__repr__()))
ipv6 = ether[IPv6]
# verify hop limit processing
if ipv6.hlim != (hop_limit - hop_num):
raise RuntimeError('Invalid hop limit {0} should be {1}'.
format(ipv6.hlim, hop_limit - hop_num))
if not ipv6.haslayer(ICMPv6EchoReply):
raise RuntimeError('Unexpected packet with no IPv6 ICMP received {0}'.
format(ipv6.__repr__()))
icmpv6 = ipv6[ICMPv6EchoReply]
# check identifier and sequence number
if icmpv6.id != echo_id or icmpv6.seq != echo_seq:
raise RuntimeError('Invalid ICMPv6 echo reply received ID {0} '
'seq {1} should be ID {2} seq {3}'.
format(icmpv6.id, icmpv6.seq, echo_id, echo_seq))
# verify checksum
cksum = icmpv6.cksum
del icmpv6.cksum
tmp = ICMPv6EchoReply(str(icmpv6))
if not checksum_equal(tmp.cksum, cksum):
raise RuntimeError('Invalid checksum {0} should be {1}'.
format(cksum, tmp.cksum))
sys.exit(0)
if __name__ == "__main__":
main()
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