Separate files needing GPL license

+ Keep apache license for now, until this is completed:
  https://wiki.fd.io/view/TSC/Relicensing_Procedure
+ Add utilities for switching license comment blocks.
 - They do not preserve attributes, so executable flag is lost.
+ Move the affected files to GPL/.
 + Update paths so files are executed from the new location.
 + Change the way scripts are started to do not require executable flag.
 + Employ OptionString when constructing longer command lines.
+ Move also PacketVerifier.py and TrafficScriptArg.py
  as they are linked with traffic scripts.
 + That means the two files are outside "resources" package tree now.
 + Added __init__.py files so relative imports work in new package tree.
+ Start traffic scripts as python modules to allow relative imports.
 + Once again needed because they are outside the default PYTHONPATH.

Change-Id: Ieb135629e890adbaf5b79497570f3be25b746f9f
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

1 files changed, 187 insertions, 0 deletions

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()