CSIT-124: IPv4 encapsulations - IP4-GRE-IP4

- add gre test with multiple tunnel configured
- configure tunnel source as a loopback
- route from tunnel to tunnel
- check droping unknown tunnel destination

Change-Id: Ib522d158d9de5c66f556c6734ceadc994eea02d4
Signed-off-by: Matej Klotton <mklotton@cisco.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/resources/traffic_scripts/send_gre_check_gre_headers.py b/resources/traffic_scripts/send_gre_check_gre_headers.py
new file mode 100755
index 0000000000..9e2e2abe06
--- /dev/null
+++ b/resources/traffic_scripts/send_gre_check_gre_headers.py
@@ -0,0 +1,124 @@
+#!/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 a UDP encapsulated into GRE packet from one
+interface to the other, where GRE encapsulated packet is expected.
+"""
+
+import sys
+
+from robot.api import logger
+from scapy.all import Ether
+from scapy.layers.inet import IP_PROTOS
+from scapy.layers.inet import IP
+from scapy.layers.inet import UDP
+from scapy.layers.l2 import GRE
+
+from resources.libraries.python.PacketVerifier import RxQueue, TxQueue
+from resources.libraries.python.TrafficScriptArg import TrafficScriptArg
+
+
+def main():
+    args = TrafficScriptArg(
+        ['tx_dst_mac', 'tx_src_mac', 'tx_outer_dst_ip', 'tx_outer_src_ip',
+         'tx_inner_dst_ip', 'tx_inner_src_ip', 'rx_dst_mac', 'rx_src_mac',
+         'rx_outer_dst_ip', 'rx_outer_src_ip'])
+
+    tx_if = args.get_arg('tx_if')
+    rx_if = args.get_arg('rx_if')
+    tx_dst_mac = args.get_arg('tx_dst_mac')
+    tx_src_mac = args.get_arg('tx_src_mac')
+    tx_outer_dst_ip = args.get_arg('tx_outer_dst_ip')
+    tx_outer_src_ip = args.get_arg('tx_outer_src_ip')
+    tx_inner_dst_ip = args.get_arg('tx_inner_dst_ip')
+    tx_inner_src_ip = args.get_arg('tx_inner_src_ip')
+    rx_dst_mac = args.get_arg('rx_dst_mac')
+    rx_src_mac = args.get_arg('rx_src_mac')
+    rx_outer_dst_ip = args.get_arg('rx_outer_dst_ip')
+    rx_outer_src_ip = args.get_arg('rx_outer_src_ip')
+    udp_src = 1234
+    udp_dst = 2345
+    udp_payload = 'udp_payload'
+
+    rxq = RxQueue(rx_if)
+    txq = TxQueue(tx_if)
+    sent_packets = []
+
+    tx_pkt_raw = Ether(dst=tx_dst_mac, src=tx_src_mac) / \
+        IP(src=tx_outer_src_ip, dst=tx_outer_dst_ip) / \
+        GRE() / \
+        IP(src=tx_inner_src_ip, dst=tx_inner_dst_ip) / \
+        UDP(dport=udp_dst, sport=udp_src) / \
+        udp_payload
+
+    sent_packets.append(tx_pkt_raw)
+    txq.send(tx_pkt_raw)
+    ether = rxq.recv(2, ignore=sent_packets)
+
+    if ether is None:
+        raise RuntimeError("ICMP echo Rx timeout")
+
+    # Check RX headers
+    if ether.dst != rx_dst_mac:
+        raise RuntimeError("Matching of received destination MAC unsuccessful.")
+    logger.debug("Comparison of received destination MAC: OK.")
+
+    if ether.src != rx_src_mac:
+        raise RuntimeError("Matching of received source MAC unsuccessful.")
+    logger.debug("Comparison of received source MAC: OK.")
+
+    if ether['IP'].src != rx_outer_src_ip:
+        raise RuntimeError("Matching of received outer source IP unsuccessful.")
+    logger.debug("Comparison of received outer source IP: OK.")
+
+    if ether['IP'].dst != rx_outer_dst_ip:
+        raise RuntimeError(
+            "Matching of received outer destination IP unsuccessful.")
+    logger.debug("Comparison of received outer destination IP: OK.")
+
+    if ether['IP'].proto != IP_PROTOS.gre:
+        raise RuntimeError("IP protocol is not GRE.")
+    logger.debug("Comparison of received GRE protocol: OK.")
+
+    if ether['IP']['GRE']['IP'].src != tx_inner_src_ip:
+        raise RuntimeError("Matching of received inner source IP unsuccessful.")
+    logger.debug("Comparison of received inner source IP: OK.")
+
+    if ether['IP']['GRE']['IP'].dst != tx_inner_dst_ip:
+        raise RuntimeError(
+            "Matching of received inner destination IP unsuccessful.")
+    logger.debug("Comparison of received inner destination IP: OK.")
+
+    # check udp
+    udp = ether['IP']['GRE']['IP']['UDP']
+    if udp.dport != udp_dst:
+        raise RuntimeError("UDP dport error {} != {}.".
+                           format(udp.dport, udp_dst))
+    print "UDP dport: OK."
+
+    if udp.sport != udp_src:
+        raise RuntimeError("UDP sport error {} != {}.".
+                           format(udp.sport, udp_src))
+    print "UDP sport: OK."
+
+    if str(udp.payload) != udp_payload:
+        raise RuntimeError("UDP payload check unsuccessful {} != {}.".
+                           format(udp.payload, udp_payload))
+    print "UDP payload: OK."
+
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()