X-Git-Url: https://gerrit.fd.io/r/gitweb?p=csit.git;a=blobdiff_plain;f=GPL%2Ftraffic_scripts%2Flisp%2Flisp_check.py;fp=GPL%2Ftraffic_scripts%2Flisp%2Flisp_check.py;h=1bdafb799a216f7c93719fd361c3aaf1c88a50d8;hp=0000000000000000000000000000000000000000;hb=79f5ba9bf7656972dd988508eff9465562dde42c;hpb=16ef90a2415aa3b65341fdb6517cf58721bfff7a diff --git a/GPL/traffic_scripts/lisp/lisp_check.py b/GPL/traffic_scripts/lisp/lisp_check.py new file mode 100644 index 0000000000..1bdafb799a --- /dev/null +++ b/GPL/traffic_scripts/lisp/lisp_check.py @@ -0,0 +1,187 @@ +#!/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 LISP-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, 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 LispHeader(Packet): + """Scapy header for the LISP Layer.""" + + name = u"Lisp Header" + fields_desc = [ + FlagsField( + u"flags", None, 8, [u"N", u"L", u"E", u"V", u"I", u"", u"", u""] + ), + BitField(u"nonce/map_version", 0, size=24), + IntField(u"instance_id/locator_status_bits", 0)] + + +class LispInnerIP(IP): + """Scapy inner LISP layer for IPv4-in-IPv4.""" + + name = u"Lisp Inner Layer - IPv4" + + +class LispInnerIPv6(IPv6): + """Scapy inner LISP layer for IPv6-in-IPv6.""" + + name = u"Lisp Inner Layer - IPv6" + + +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 + lisp_layer = LispInnerIP + 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 + lisp_layer = LispInnerIPv6 + else: + raise ValueError(u"IP not in correct format") + + bind_layers(UDP, LispHeader, dport=4341) + bind_layers(LispHeader, lisp_layer) + + 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(lisp_layer) + if not lisp: + raise RuntimeError("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()