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authorselias <samelias@cisco.com>2016-09-06 09:43:56 +0200
committerMatej Klotton <mklotton@cisco.com>2016-09-14 14:13:30 +0000
commit6d104077b5a6a8a0595001ecf051f63c651c131e (patch)
tree0a57637bd3bca4ae9f72ea2885b0b669ed183148 /resources/traffic_scripts/send_rs_check_ra.py
parent4fd732ead033453ce0c14a97f42d735cbd7de973 (diff)
CSIT-241: IPv6 Router Advertisement
- add traffic script to verify Router Solicitation response - add keyword to execute traffic script - add test case 02: retransmit RA message after set interval - add test case 03: respond to RS request Change-Id: I83d742713ae42d0a1baacf460c29c06d32669b9a Signed-off-by: selias <samelias@cisco.com>
Diffstat (limited to 'resources/traffic_scripts/send_rs_check_ra.py')
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diff --git a/resources/traffic_scripts/send_rs_check_ra.py b/resources/traffic_scripts/send_rs_check_ra.py
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+++ b/resources/traffic_scripts/send_rs_check_ra.py
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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.
+
+"""Router solicitation check script."""
+
+import sys
+import ipaddress
+
+from scapy.layers.l2 import Ether
+from scapy.layers.inet6 import IPv6, ICMPv6ND_RS
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def mac_to_ipv6_linklocal(mac):
+ """Transfer MAC address into specific link-local IPv6 address.
+
+ :param mac: MAC address to be transferred.
+ :type mac: str
+ :return: IPv6 link-local address.
+ :rtype: str
+ """
+ # Remove the most common delimiters: dots, dashes, etc.
+ mac_value = int(mac.translate(None, ' .:-'), 16)
+
+ # Split out the bytes that slot into the IPv6 address
+ # XOR the most significant byte with 0x02, inverting the
+ # Universal / Local bit
+ high2 = mac_value >> 32 & 0xffff ^ 0x0200
+ high1 = mac_value >> 24 & 0xff
+ low1 = mac_value >> 16 & 0xff
+ low2 = mac_value & 0xffff
+
+ return 'fe80::{:04x}:{:02x}ff:fe{:02x}:{:04x}'.format(
+ high2, high1, low1, low2)
+
+
+def main():
+ """Send Router Solicitation packet, check if the received response\
+ is a Router Advertisement packet and verify."""
+
+ args = TrafficScriptArg(
+ ['src_mac', 'dst_mac', 'src_ip']
+ )
+
+ router_mac = args.get_arg('dst_mac')
+ src_mac = args.get_arg('src_mac')
+ src_ip = args.get_arg('src_ip')
+ if not src_ip:
+ src_ip = mac_to_ipv6_linklocal(src_mac)
+ tx_if = args.get_arg('tx_if')
+
+ txq = TxQueue(tx_if)
+ rxq = RxQueue(tx_if)
+
+ pkt_raw = (Ether(src=src_mac, dst='33:33:00:00:00:02') /
+ IPv6(src=src_ip, dst='ff02::2') /
+ ICMPv6ND_RS())
+
+ sent_packets = [pkt_raw]
+ txq.send(pkt_raw)
+
+ ether = rxq.recv(8, ignore=sent_packets)
+
+ # Check whether received packet contains layer RA and check other values
+ if ether is None:
+ raise RuntimeError('ICMP echo Rx timeout')
+
+ if ether.src != router_mac:
+ raise RuntimeError(
+ 'Packet source MAC ({0}) does not match '
+ 'router MAC ({1}).'.format(ether.src, router_mac))
+ if ether.dst != src_mac:
+ raise RuntimeError(
+ 'Packet destination MAC ({0}) does not match '
+ 'RS source MAC ({1}).'.format(ether.dst, src_mac))
+
+ if not ether.haslayer('ICMPv6ND_RA'):
+ raise RuntimeError('Not an RA packet received {0}'
+ .format(ether.__repr__()))
+
+ src_address = ipaddress.IPv6Address(unicode(ether['IPv6'].src))
+ dst_address = ipaddress.IPv6Address(unicode(ether['IPv6'].dst))
+ router_link_local = ipaddress.IPv6Address(unicode(
+ mac_to_ipv6_linklocal(router_mac)))
+ rs_src_address = ipaddress.IPv6Address(unicode(src_ip))
+
+ if src_address != router_link_local:
+ raise RuntimeError(
+ 'Packet source address ({0}) does not match '
+ 'link local address({1})'.format(src_address, router_link_local))
+
+ if dst_address != rs_src_address:
+ raise RuntimeError(
+ 'Packet destination address ({0}) does not match '
+ 'RS source address ({1}).'.format(dst_address, rs_src_address))
+
+ if ether['IPv6'].hlim != 255:
+ raise RuntimeError('Hop limit not correct: {0}!=255'.format(
+ ether['IPv6'].hlim))
+
+ ra_code = ether['ICMPv6 Neighbor Discovery - Router Advertisement'].code
+ if ra_code != 0:
+ raise RuntimeError('ICMP code: {0} not correct. '.format(ra_code))
+
+ sys.exit(0)
+
+if __name__ == "__main__":
+ main()