#!/usr/bin/env python
-# Copyright (c) 2016 Cisco and/or its affiliates.
+# Copyright (c) 2018 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:
# 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."""
+"""Send ICMPv6 echo request from one TG port to DUT port or to another TG port
+ through DUT node(s) 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 resources.libraries.python.PacketVerifier import RxQueue, TxQueue
-from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
-from scapy.layers.inet6 import IPv6, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr
+
+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_ip', 'dst_ip', 'h_num'], ['is_dst_tg'])
- 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_rxq = RxQueue(args.get_arg('tx_if'))
+ src_txq = TxQueue(args.get_arg('tx_if'))
src_mac = args.get_arg('src_mac')
dst_mac = args.get_arg('dst_mac')
src_ip = args.get_arg('src_ip')
dst_ip = args.get_arg('dst_ip')
hop_num = int(args.get_arg('h_num'))
+
+ is_dst_tg = True if args.get_arg('is_dst_tg') in ['True', ''] else False
+ dst_rxq = RxQueue(args.get_arg('rx_if')) if is_dst_tg else None
+ dst_txq = TxQueue(args.get_arg('rx_if')) if is_dst_tg else None
+
hop_limit = 64
echo_id = 0xa
echo_seq = 0x1
# 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))
+ 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)
+
+ if is_dst_tg:
+ # send ICMPv6 neighbor advertisement message
+ 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))
+ 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
- ether = dst_rxq.recv(2, dst_sent_packets)
- if ether is None:
- raise RuntimeError('ICMPv6 echo reply Rx timeout')
-
- 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['ICMPv6 Echo Request']
-
- # 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 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)
+ if is_dst_tg:
+ # 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, hlim=(ipv6.hlim - 1)) /
+ 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
- ether = src_rxq.recv(2, src_sent_packets)
- if ether is None:
- raise RuntimeError('ICMPv6 echo reply Rx timeout')
+ 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 received {0}'.format(
- ether.__repr__()))
+ raise RuntimeError('Unexpected packet with no IPv6 layer received {0}'.
+ format(ether.__repr__()))
- ipv6 = ether['IPv6']
+ 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))
+ # verify hop limit processing; destination node decrements hlim by one in
+ # outgoing ICMPv6 Echo Reply
+ directions = 2 if is_dst_tg else 1
+ hop_limit_reply = hop_limit - directions * hop_num - 1
+ if ipv6.hlim != hop_limit_reply:
+ raise RuntimeError('Invalid hop limit {0} should be {1}'.
+ format(ipv6.hlim, hop_limit_reply))
if not ipv6.haslayer(ICMPv6EchoReply):
- raise RuntimeError(
- 'Unexpected packet with no IPv6 ICMP received {0}'.format(
- ipv6.__repr__()))
+ raise RuntimeError('Unexpected packet with no IPv6 ICMP received {0}'.
+ format(ipv6.__repr__()))
- icmpv6 = ipv6['ICMPv6 Echo Reply']
+ 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))
+ 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 tmp.cksum != cksum:
- raise RuntimeError(
- 'Invalid checksum {0} should be {1}'.format(cksum, tmp.cksum))
+ 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()
Code Review / csit.git / blobdiff