--- /dev/null
+#!/usr/bin/env python3
+
+# Copyright (c) 2020 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 ICMP/ICMPv6 packet out one interface, receives
+a LISPGPE-encapsulated packet on the other interface and verifies received
+packet.
+"""
+
+import sys
+import ipaddress
+
+from scapy.all import bind_layers, Packet
+from scapy.fields import FlagsField, BitField, XBitField, IntField
+from scapy.layers.inet import ICMP, IP, UDP
+from scapy.layers.inet6 import ICMPv6EchoRequest
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+
+from ..PacketVerifier import RxQueue, TxQueue
+from ..TrafficScriptArg import TrafficScriptArg
+
+
+class LispGPEHeader(Packet):
+ """Scapy header for the Lisp GPE Layer."""
+
+ name = "Lisp GPE Header"
+ fields_desc = [
+ FlagsField(
+ u"flags", None, 8, [u"N", u"L", u"E", u"V", u"I", u"P", u"R", u"O"]
+ ),
+ BitField(u"version", 0, size=2),
+ BitField(u"reserved", 0, size=14),
+ XBitField(u"next_protocol", 0, size=8),
+ IntField(u"instance_id/locator_status_bits", 0)
+ ]
+
+ def guess_payload_class(self, payload):
+ protocol = {
+ 0x1: LispGPEInnerIP,
+ 0x2: LispGPEInnerIPv6,
+ 0x3: LispGPEInnerEther,
+ 0x4: LispGPEInnerNSH
+ }
+ return protocol[self.next_protocol]
+
+
+class LispGPEInnerIP(IP):
+ """Scapy inner LISP GPE layer for IPv4-in-IPv4."""
+
+ name = u"Lisp GPE Inner Layer - IPv4"
+
+
+class LispGPEInnerIPv6(IPv6):
+ """Scapy inner LISP GPE layer for IPv6-in-IPv6."""
+
+ name = u"Lisp GPE Inner Layer - IPv6"
+
+
+class LispGPEInnerEther(Ether):
+ """Scapy inner LISP GPE layer for Lisp-L2."""
+
+ name = u"Lisp GPE Inner Layer - Ethernet"
+
+
+class LispGPEInnerNSH(Packet):
+ """Scapy inner LISP GPE layer for Lisp-NSH.
+
+ Parsing not implemented.
+ """
+
+
+def valid_ipv4(ip):
+ try:
+ ipaddress.IPv4Address(ip)
+ return True
+ except (AttributeError, ipaddress.AddressValueError):
+ return False
+
+
+def valid_ipv6(ip):
+ try:
+ ipaddress.IPv6Address(ip)
+ return True
+ except (AttributeError, ipaddress.AddressValueError):
+ return False
+
+
+def main():
+ """Send IP ICMP packet from one traffic generator interface to the other.
+
+ :raises RuntimeError: If the received packet is not correct."""
+
+ args = TrafficScriptArg(
+ [
+ u"tg_src_mac", u"tg_dst_mac", u"src_ip", u"dst_ip", u"dut_if1_mac",
+ u"dut_if2_mac", u"src_rloc", u"dst_rloc"
+ ],
+ [u"ot_mode"]
+ )
+
+ tx_src_mac = args.get_arg(u"tg_src_mac")
+ tx_dst_mac = args.get_arg(u"dut_if1_mac")
+ rx_dst_mac = args.get_arg(u"tg_dst_mac")
+ rx_src_mac = args.get_arg(u"dut_if2_mac")
+ src_ip = args.get_arg(u"src_ip")
+ dst_ip = args.get_arg(u"dst_ip")
+ src_rloc = args.get_arg(u"src_rloc")
+ dst_rloc = args.get_arg(u"dst_rloc")
+ tx_if = args.get_arg(u"tx_if")
+ rx_if = args.get_arg(u"rx_if")
+ ot_mode = args.get_arg(u"ot_mode")
+
+ rxq = RxQueue(rx_if)
+ txq = TxQueue(tx_if)
+
+ pkt_raw = Ether(src=tx_src_mac, dst=tx_dst_mac)
+
+ if valid_ipv4(src_ip) and valid_ipv4(dst_ip):
+ pkt_raw /= IP(src=src_ip, dst=dst_ip)
+ pkt_raw /= ICMP()
+ ip_format = IP
+ elif valid_ipv6(src_ip) and valid_ipv6(dst_ip):
+ pkt_raw /= IPv6(src=src_ip, dst=dst_ip)
+ pkt_raw /= ICMPv6EchoRequest()
+ ip_format = IPv6
+ else:
+ raise ValueError(u"IP not in correct format")
+
+ bind_layers(UDP, LispGPEHeader, dport=4341)
+
+ pkt_raw /= Raw()
+ sent_packets = list()
+ sent_packets.append(pkt_raw)
+ txq.send(pkt_raw)
+
+ if tx_if == rx_if:
+ ether = rxq.recv(2, ignore=sent_packets)
+ else:
+ ether = rxq.recv(2)
+
+ if ether is None:
+ raise RuntimeError(u"ICMP echo Rx timeout")
+
+ if rx_dst_mac == ether[Ether].dst and rx_src_mac == ether[Ether].src:
+ print(u"MAC addresses match.")
+ else:
+ raise RuntimeError(f"Matching packet unsuccessful: {ether!r}")
+
+ ip = ether.payload
+
+ if ot_mode == u"6to4":
+ if not isinstance(ip, IP):
+ raise RuntimeError(f"Not an IP packet received {ip!r}")
+ elif ot_mode == u"4to6":
+ if not isinstance(ip, IPv6):
+ raise RuntimeError(f"Not an IP packet received {ip!r}")
+ elif not isinstance(ip, ip_format):
+ raise RuntimeError(f"Not an IP packet received {ip!r}")
+
+ lisp = ether.getlayer(LispGPEHeader).underlayer
+ if not lisp:
+ raise RuntimeError(u"Lisp layer not present or parsing failed.")
+
+ # Compare data from packets
+ if src_ip == lisp.src:
+ print(u"Source IP matches source EID.")
+ else:
+ raise RuntimeError(
+ f"Matching Src IP unsuccessful: {src_ip} != {lisp.src}"
+ )
+
+ if dst_ip == lisp.dst:
+ print(u"Destination IP matches destination EID.")
+ else:
+ raise RuntimeError(
+ f"Matching Dst IP unsuccessful: {dst_ip} != {lisp.dst}"
+ )
+
+ if src_rloc == ip.src:
+ print(u"Source RLOC matches configuration.")
+ else:
+ raise RuntimeError(
+ f"Matching Src RLOC unsuccessful: {src_rloc} != {ip.src}"
+ )
+
+ if dst_rloc == ip.dst:
+ print(u"Destination RLOC matches configuration.")
+ else:
+ raise RuntimeError(
+ f"Matching dst RLOC unsuccessful: {dst_rloc} != {ip.dst}"
+ )
+
+ sys.exit(0)
+
+
+if __name__ == u"__main__":
+ main()
Code Review / csit.git / blobdiff