+#!/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.
+
+"""Traffic script that sends an IP ICMPv4/ICMPv6 packet from one interface
+to the other. Source and destination IP addresses and source and destination
+MAC addresses are checked in received packet.
+"""
+
+import sys
+import ipaddress
+
+from scapy.layers.inet import IP, ICMP, ARP
+from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply
+from scapy.layers.l2 import Ether
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue, auto_pad
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def valid_ipv4(address):
+ """Check if IP address has the correct IPv4 address format.
+
+ :param address: IP address.
+ :type address: str
+ :return: True in case of correct IPv4 address format,
+ otherwise return false.
+ :rtype: bool
+ """
+ try:
+ ipaddress.IPv4Address(unicode(address))
+ return True
+ except (AttributeError, ipaddress.AddressValueError):
+ return False
+
+
+def valid_ipv6(address):
+ """Check if IP address has the correct IPv6 address format.
+
+ :param address: IP address.
+ :type address: str
+ :return: True in case of correct IPv6 address format,
+ otherwise return false.
+ :rtype: bool
+ """
+ try:
+ ipaddress.IPv6Address(unicode(address))
+ return True
+ except (AttributeError, ipaddress.AddressValueError):
+ return False
+
+
+def main():
+ """Send a simple L2 or ICMP packet from one TG interface to DUT, then
+ receive a copy of the packet on the second TG interface, and a copy of
+ the ICMP reply."""
+ args = TrafficScriptArg(
+ ['tg_src_mac', 'src_ip', 'dst_ip', 'dut_if1_mac', 'ptype'])
+
+ src_mac = args.get_arg('tg_src_mac')
+ dst_mac = args.get_arg('dut_if1_mac')
+ src_ip = args.get_arg('src_ip')
+ dst_ip = args.get_arg('dst_ip')
+ tx_if = args.get_arg('tx_if')
+ rx_if = args.get_arg('rx_if')
+ ptype = args.get_arg('ptype')
+
+ rxq = RxQueue(rx_if)
+ txq = TxQueue(tx_if)
+
+ if ptype == "ARP":
+ pkt_raw = (Ether(src=src_mac, dst=dst_mac) /
+ ARP(hwsrc=src_mac, hwdst="00:00:00:00:00:00",
+ psrc=src_ip, pdst=dst_ip, op="who-has"))
+ elif ptype == "ICMP":
+ if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
+ pkt_raw = (Ether(src=src_mac, dst=dst_mac) /
+ IP(src=src_ip, dst=dst_ip) /
+ ICMP(type="echo-request"))
+ elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
+ pkt_raw = (Ether(src=src_mac, dst=dst_mac) /
+ IPv6(src=src_ip, dst=dst_ip) /
+ ICMPv6EchoRequest())
+ else:
+ raise ValueError("IP not in correct format")
+ else:
+ raise RuntimeError("Unexpected payload type.")
+
+ txq.send(pkt_raw)
+ ether = rxq.recv(2)
+
+ # Receive copy of sent packet.
+ if ether is None:
+ raise RuntimeError("Rx timeout")
+ pkt = auto_pad(pkt_raw)
+ if str(ether) != str(pkt):
+ raise RuntimeError("Mirrored packet does not match packet sent.")
+
+ # Receive copy of reply to sent packet.
+ ether = rxq.recv(2)
+ if ether is None:
+ raise RuntimeError("Rx timeout")
+ if ether.src != dst_mac or ether.dst != src_mac:
+ raise RuntimeError("MAC mismatch in mirrored response.")
+ if ptype == "ARP":
+ if ether['ARP'].op != 2:
+ raise RuntimeError("Mirrored packet is not an ARP reply.")
+ if ether['ARP'].hwsrc != dst_mac or ether['ARP'].hwdst != src_mac:
+ raise RuntimeError("ARP MAC does not match l2 MAC "
+ "in mirrored response.")
+ if ether['ARP'].psrc != dst_ip or ether['ARP'].pdst != src_ip:
+ raise RuntimeError("ARP IP address mismatch in mirrored response.")
+ elif ptype == "ICMP" and ether.haslayer(IP):
+ if ether['IP'].src != dst_ip or ether['IP'].dst != src_ip:
+ raise RuntimeError("IP address mismatch in mirrored reply.")
+ if ether['ICMP'].type != 0:
+ raise RuntimeError("Mirrored packet is not an ICMP reply.")
+ elif ptype == "ICMP" and ether.haslayer(IPv6):
+ if ether['IPv6'].src != dst_ip or ether['IPv6'].dst != src_ip:
+ raise RuntimeError("IP address mismatch in mirrored reply.")
+ if not ether.haslayer(ICMPv6EchoReply):
+ raise RuntimeError("Mirrored packet is not an ICMP reply.")
+
+ sys.exit(0)
+
+
+if __name__ == "__main__":
+ main()
Code Review / csit.git / commitdiff