Add the NSH SFC functional test cases.

	1. Proxy Inbound test with 152/256/512/1024/1280/1518 Bytes VxLAN-GPE + NSH packet
	2. Proxy Outbound test with 128/256/512/1024/1280/1518 Bytes VxLAN packet
	3. SFC SFF test with 152/256/512/1024/1280/1518 Bytes VxLAN-GPE + NSH packet

	Separate the functional test bootstrap file to another code review.

Change-Id: I05cf6ab1d01c1b41c1c61044d6d31fd6219b86af
Signed-off-by: Fangyin Hu <fangyinx.hu@intel.com>

6 files changed, 642 insertions, 0 deletions

diff --git a/resources/libraries/python/SFC/SFCConstants.py b/resources/libraries/python/SFC/SFCConstants.py
new file mode 100644
index 0000000000..33391a1771
--- /dev/null
+++ b/resources/libraries/python/SFC/SFCConstants.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+# Copyright (c) 2017 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.
+
+"""
+This module define some constants.
+"""
+
+class SFCConstants(object):
+    """
+    Define some constants for the test filed verify.
+    """
+
+    DEF_SRC_PORT = 1234
+    DEF_DST_PORT = 5678
+    UDP_PROTOCOL = 17
+    VxLAN_UDP_PORT = 4789
+    VxLANGPE_UDP_PORT = 4790
+    VxLAN_FLAGS = 0x8
+    VxLAN_DEFAULT_VNI = 1
+    VxLANGPE_FLAGS = 0xc
+    VxLANGPE_NEXT_PROTOCOL = 0x4
+    VxLANGPE_DEFAULT_VNI = 9
+    NSH_FLAGS = 0x0
+    NSH_HEADER_LENGTH = 0x6
+    NSH_DEFAULT_MDTYPE = 0x1
+    NSH_NEXT_PROTOCOL = 0x3
+    NSH_DEFAULT_NSP = 185
+    NSH_DEFAULT_NSI = 255
+    NSH_DEFAULT_C1 = 3232248395
+    NSH_DEFAULT_C2 = 9
+    NSH_DEFAULT_C3 = 3232248392
+    NSH_DEFAULT_C4 = 50336437
diff --git a/resources/libraries/python/SFC/SFCTest.py b/resources/libraries/python/SFC/SFCTest.py
new file mode 100644
index 0000000000..456457f9f6
--- /dev/null
+++ b/resources/libraries/python/SFC/SFCTest.py
@@ -0,0 +1,93 @@
+# Copyright (c) 2017 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.
+
+"""
+This module implements functionality which configure and start
+the NSH SFC functional test.
+"""
+
+from resources.libraries.python.ssh import SSH
+from resources.libraries.python.constants import Constants as con
+from resources.libraries.python.topology import Topology
+
+class SFCTest(object):
+    """Configure and Start the NSH SFC functional tests."""
+
+    @staticmethod
+    def config_and_start_SFC_test(dut_node, dut_port, adj_mac, testtype):
+        """
+        Start the SFC functional on the dut_node.
+
+        :param dut_node: Will execute the SFC on this node.
+        :param dut_port: The ingress interface on the DUT.
+        :param adj_mac: The adjacency interface MAC.
+        :param testtype: The SFC functional test type.
+                         (Classifier, Proxy Inbound, Proxy Outbound, SFF).
+        :type dut_node: dict
+        :type dut_port: str
+        :type adj_mac: str
+        :type testtype: str
+        :returns: none
+        :raises RuntimeError: If the script execute fails.
+        """
+
+        vpp_intf_name = Topology.get_interface_name(dut_node, dut_port)
+
+        ssh = SSH()
+        ssh.connect(dut_node)
+
+        if testtype == "Classifier":
+            exec_shell = "set_sfc_classifier.sh"
+        elif testtype == "Proxy Inbound":
+            exec_shell = "set_nsh_proxy_inbound.sh"
+        elif testtype == "Proxy Outbound":
+            exec_shell = "set_nsh_proxy_outbound.sh"
+        else:
+            exec_shell = "set_sfc_sff.sh"
+
+        cmd = 'cd {0}/nsh_sfc_tests/sfc_scripts/ && sudo ./{1} {2} ' \
+              '{3} {4}'.format(con.REMOTE_FW_DIR, exec_shell, vpp_intf_name,
+                               adj_mac, dut_port)
+
+        (ret_code, _, _) = ssh.exec_command(cmd, timeout=600)
+        if ret_code != 0:
+            raise RuntimeError('Failed to execute SFC setup script ' \
+                 '{0} at node {1}'.format(exec_shell, dut_node['host']))
+
+    @staticmethod
+    def start_the_tcpdump_on_the_node(from_node, from_port, filter_ip):
+        """
+        Start the tcpdump on the frome_node.
+
+        :param from_node: Will execute the tcpdump on this node.
+        :param from_port: Will capture the packets on this interface.
+        :param filter_ip: filter the dest ip.
+        :type from_node: dict
+        :type from_port: str
+        :type filter_ip: str
+        :returns: none
+        :raises RuntimeError: If the script "start_tcpdump.sh" fails.
+        """
+
+        interface_name = Topology.get_interface_name(from_node, from_port)
+
+        ssh = SSH()
+        ssh.connect(from_node)
+
+        cmd = 'cd {0}/nsh_sfc_tests/sfc_scripts/ && sudo ./start_tcpdump.sh ' \
+              '{1} {2}'.format(con.REMOTE_FW_DIR, interface_name, filter_ip)
+
+        (ret_code, _, _) = ssh.exec_command(cmd, timeout=600)
+        if ret_code != 0:
+            raise RuntimeError('Failed to exec start_tcpdump.sh at node {0}'.
+                               format(from_node['host']))
diff --git a/resources/libraries/python/SFC/SetupSFCTest.py b/resources/libraries/python/SFC/SetupSFCTest.py
new file mode 100644
index 0000000000..d481202837
--- /dev/null
+++ b/resources/libraries/python/SFC/SetupSFCTest.py
@@ -0,0 +1,226 @@
+# Copyright (c) 2017 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.
+
+"""This module exists to provide setup utilities for the framework on topology
+nodes. All tasks required to be run before the actual tests are started is
+supposed to end up here.
+"""
+
+from shlex import split
+from subprocess import Popen, PIPE, call
+from multiprocessing import Pool
+from tempfile import NamedTemporaryFile
+from os.path import basename
+
+from robot.api import logger
+from robot.libraries.BuiltIn import BuiltIn
+
+from resources.libraries.python.ssh import SSH
+from resources.libraries.python.constants import Constants as con
+from resources.libraries.python.topology import NodeType
+from resources.libraries.python.topology import Topology
+
+__all__ = ["SetupSFCTest"]
+
+
+def pack_framework_dir():
+    """Pack the testing WS into temp file, return its name.
+
+    :returns: the temporary package file name.
+    :rtype: str
+    :raises: If execute the tar command failed.
+    """
+
+    tmpfile = NamedTemporaryFile(suffix=".tgz", prefix="SFC-testing-")
+    file_name = tmpfile.name
+    tmpfile.close()
+
+    proc = Popen(
+        split("tar --exclude-vcs --exclude=./tmp -zcf {0} .".format(file_name)),
+        stdout=PIPE, stderr=PIPE)
+    (stdout, stderr) = proc.communicate()
+
+    logger.debug(stdout)
+    logger.debug(stderr)
+
+    return_code = proc.wait()
+    if return_code != 0:
+        raise RuntimeError("Could not pack testing framework.")
+
+    return file_name
+
+
+def copy_tarball_to_node(tarball, node):
+    """Copy tarball file from local host to remote node.
+
+    :param tarball: Path to tarball to upload.
+    :param node: Node in the topology where the tarball will be copied to.
+    :type tarball: str
+    :type node: dict
+    :returns: nothing
+    """
+    logger.console('Copying tarball to {0}'.format(node['host']))
+    ssh = SSH()
+    ssh.connect(node)
+
+    ssh.scp(tarball, "/tmp/")
+
+
+def extract_tarball_at_node(tarball, node):
+    """Extract tarball at given node.
+
+    Extracts tarball using tar on given node to specific CSIT loocation.
+
+    :param tarball: Path to tarball to upload.
+    :param node: Dictionary created from topology.
+    :type tarball: str
+    :type node: dict
+    :returns: nothing
+    :raises: If unpack the file failed.
+    """
+    logger.console('Extracting tarball to {0} on {1}'.format(
+        con.REMOTE_FW_DIR, node['host']))
+    ssh = SSH()
+    ssh.connect(node)
+
+    cmd = 'sudo rm -rf {1}; mkdir {1} ; tar -zxf {0} -C {1}; ' \
+        'rm -f {0}'.format(tarball, con.REMOTE_FW_DIR)
+    (ret_code, _, stderr) = ssh.exec_command(cmd, timeout=30)
+    if ret_code != 0:
+        logger.error('Unpack error: {0}'.format(stderr))
+        raise RuntimeError('Failed to unpack {0} at node {1}'.format(
+            tarball, node['host']))
+
+
+def create_env_directory_at_node(node):
+    """Create fresh virtualenv to a directory, install pip requirements.
+
+    :param node: Dictionary created from topology, will only install in the TG
+    :type node: dict
+    :returns: nothing
+    """
+    logger.console('Extracting virtualenv, installing requirements.txt '
+                   'on {0}'.format(node['host']))
+    ssh = SSH()
+    ssh.connect(node)
+    (ret_code, stdout, stderr) = ssh.exec_command(
+        'cd {0} && rm -rf env && '
+        'virtualenv --system-site-packages --never-download env && '
+        '. env/bin/activate && pip install -r requirements.txt'
+        .format(con.REMOTE_FW_DIR), timeout=100)
+    if ret_code != 0:
+        logger.error('Virtualenv creation error: {0}'.format(stdout + stderr))
+        raise RuntimeError('Virtualenv setup failed')
+    else:
+        logger.console('Virtualenv created on {0}'.format(node['host']))
+
+def install_sfc_test(node):
+    """Prepare the NSH SFC test envrionment.
+
+    :param node: Dictionary created from topology
+    :type node: dict
+    :returns: nothing
+    """
+    logger.console('Install the NSH SFC on {0}'.format(node['host']))
+
+    if_name_list = Topology.get_node_interfaces(node)
+
+    ssh = SSH()
+    ssh.connect(node)
+
+    (ret_code, _, stderr) = ssh.exec_command(
+        'cd {0}/nsh_sfc_tests/sfc_scripts/ && ./install_sfc.sh {1} {2}'
+        .format(con.REMOTE_FW_DIR, if_name_list[0], if_name_list[1]), \
+        timeout=600)
+
+    if ret_code != 0:
+        logger.error('Install the NSH SFC error: {0}'.format(stderr))
+        raise RuntimeError('Install the NSH SFC failed')
+    else:
+        logger.console('Install the NSH SFC on {0} success!'.
+                       format(node['host']))
+
+def setup_node(args):
+    """Run all set-up methods for a node.
+
+    This method is used as map_async parameter. It receives tuple with all
+    parameters as passed to map_async function.
+
+    :param args: All parameters needed to setup one node.
+    :type args: tuple
+    :returns: True - success, False - error
+    :rtype: bool
+    """
+    tarball, remote_tarball, node = args
+    try:
+        copy_tarball_to_node(tarball, node)
+        extract_tarball_at_node(remote_tarball, node)
+        if node['type'] == NodeType.DUT:
+            install_sfc_test(node)
+        if node['type'] == NodeType.TG:
+            create_env_directory_at_node(node)
+    except RuntimeError as exc:
+        logger.error("Node setup failed, error:'{0}'".format(exc.message))
+        return False
+    else:
+        logger.console('Setup of node {0} done'.format(node['host']))
+        return True
+
+def delete_local_tarball(tarball):
+    """Delete local tarball to prevent disk pollution.
+
+    :param tarball: Path to tarball to upload.
+    :type tarball: str
+    :returns: nothing
+    """
+    call(split('sh -c "rm {0} > /dev/null 2>&1"'.format(tarball)))
+
+
+class SetupSFCTest(object):
+    """Setup suite run on topology nodes.
+
+    Many VAT/CLI based tests need the scripts at remote hosts before executing
+    them. This class packs the whole testing directory and copies it over
+    to all nodes in topology under /tmp/
+    """
+
+    @staticmethod
+    def setup_nsh_sfc_test(nodes):
+        """Pack the whole directory and extract in temp on each node."""
+
+        tarball = pack_framework_dir()
+        msg = 'Framework packed to {0}'.format(tarball)
+        logger.console(msg)
+        logger.trace(msg)
+        remote_tarball = "/tmp/{0}".format(basename(tarball))
+
+        # Turn off logging since we use multiprocessing
+        log_level = BuiltIn().set_log_level('NONE')
+        params = ((tarball, remote_tarball, node) for node in nodes.values())
+        pool = Pool(processes=len(nodes))
+        result = pool.map_async(setup_node, params)
+        pool.close()
+        pool.join()
+
+        # Turn on logging
+        BuiltIn().set_log_level(log_level)
+
+        logger.info(
+            'Executed node setups in parallel, waiting for processes to end')
+        result.wait()
+
+        logger.info('Results: {0}'.format(result.get()))
+
+        logger.trace('Test framework copied to all topology nodes')
+        delete_local_tarball(tarball)
+        logger.console('All nodes are ready')
diff --git a/resources/libraries/python/SFC/TunnelProtocol.py b/resources/libraries/python/SFC/TunnelProtocol.py
new file mode 100644
index 0000000000..4b4377c895
--- /dev/null
+++ b/resources/libraries/python/SFC/TunnelProtocol.py
@@ -0,0 +1,41 @@
+# Copyright (c) 2017 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.
+
+"""
+This module implements the VxLAN/VXLAN-GPE/NSH protocol
+for the packet analyse.
+"""
+from scapy.all import Packet
+from scapy.all import XByteField, ShortField
+from scapy.all import BitField, XBitField, IntField
+
+class VxLAN(Packet):
+    """Define the vxlan protocol for the packet analysis."""
+    name = "vxlan"
+    fields_desc = [XByteField("flags", 0x08), BitField("reserved", 0, 24),
+                   BitField("vni", 0, 24), XByteField("reserved", 0x00)]
+
+class VxLANGPE(Packet):
+    """Define the vxlan-gpe protocol for the packet analysis."""
+    name = "vxlan-gpe"
+    fields_desc = [XByteField("flags", 0x0c), ShortField("reserved", 0),
+                   XByteField("nextproto", 0x3), BitField("vni", 0, 24),
+                   XByteField("reserved", 0x0)]
+
+class NSH(Packet):
+    """Define the NSH protocol for the packet analysis."""
+    name = "nsh"
+    fields_desc = [XBitField("flags", 0x0, 10), XBitField("length", 0x6, 6),
+                   XByteField("MDtype", 0x1), XByteField("nextproto", 0x3),
+                   IntField("nsp_nsi", 0), IntField("c1", 0),
+                   IntField("c2", 0), IntField("c3", 0), IntField("c4", 0)]
diff --git a/resources/libraries/python/SFC/VerifyPacket.py b/resources/libraries/python/SFC/VerifyPacket.py
new file mode 100644
index 0000000000..66bd09899d
--- /dev/null
+++ b/resources/libraries/python/SFC/VerifyPacket.py
@@ -0,0 +1,223 @@
+#!/usr/bin/env python
+# Copyright (c) 2017 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.
+
+"""
+This module defines the common functions.
+"""
+
+import ipaddress
+
+from scapy.layers.inet import IP, UDP
+from scapy.all import Raw
+from scapy.utils import rdpcap
+from resources.libraries.python.constants import Constants as con
+from resources.libraries.python.SFC.SFCConstants import SFCConstants as sfccon
+from resources.libraries.python.SFC.TunnelProtocol import VxLAN, VxLANGPE, NSH
+
+from robot.api import logger
+
+def valid_ipv4(ipaddr):
+    """Check if IP address has the correct IPv4 address format.
+
+    :param ipaddr: IP address.
+    :type ipaddr: str
+    :returns: True in case of correct IPv4 address format,
+              otherwise return False.
+    :rtype: bool
+    """
+    try:
+        ipaddress.IPv4Address(unicode(ipaddr))
+        return True
+    except (AttributeError, ipaddress.AddressValueError):
+        return False
+
+
+def valid_ipv6(ipaddr):
+    """Check if IP address has the correct IPv6 address format.
+
+    :param ipaddr: IP address.
+    :type ipaddr: str
+    :returns: True in case of correct IPv6 address format,
+              otherwise return False.
+    :rtype: bool
+    """
+    try:
+        ipaddress.IPv6Address(unicode(ipaddr))
+        return True
+    except (AttributeError, ipaddress.AddressValueError):
+        return False
+
+
+class VerifyPacket(object):
+    """Define some functions for the test filed verify."""
+
+    @staticmethod
+    def check_vxlan_protocol(payload_data):
+        """
+        verify the vxlan protocol in the payload data.
+
+        :param payload_data: the payload data in the packet.
+        :type payload_data: str
+        :returns: none
+        :raises RuntimeError: If the vxlan protocol field verify fails.
+        """
+        # get the vxlan packet and check it
+        vxlan_pkt = VxLAN(payload_data[0:8])
+        if vxlan_pkt.flags != sfccon.VxLAN_FLAGS:
+            raise RuntimeError("Unexpected Vxlan flags: {0}".
+                               format(vxlan_pkt.flags))
+
+        if vxlan_pkt.vni != sfccon.VxLAN_DEFAULT_VNI:
+            raise RuntimeError("Unexpected VNI flag: {0}".format(vxlan_pkt.vni))
+
+    @staticmethod
+    def check_vxlangpe_nsh_protocol(payload_data, test_type):
+        """
+        verify the vxlangpe and nsh protocol in the payload data.
+
+        :param payload_data: the payload data in the packet.
+        :param test_type: the functional test type.
+        :type payload_data: str
+        :type test_type: str
+        :returns: none
+        :raises RuntimeError: If the vxlangpe and nsh protocol
+                              field verify fails.
+        """
+        # get the vxlan-gpe packet and check it
+        vxlangpe_pkt = VxLANGPE(payload_data[0:8])
+        if vxlangpe_pkt.flags != sfccon.VxLANGPE_FLAGS:
+            raise RuntimeError("Unexpected Vxlan-GPE flags: {0}".
+                               format(vxlangpe_pkt.flags))
+
+        if vxlangpe_pkt.nextproto != sfccon.VxLANGPE_NEXT_PROTOCOL:
+            raise RuntimeError("next protocol not the NSH")
+
+        if vxlangpe_pkt.vni != sfccon.VxLANGPE_DEFAULT_VNI:
+            raise RuntimeError("Unexpected VNI flag: {0}".
+                               format(vxlangpe_pkt.vni))
+
+        # get the NSH packet and check it
+        nsh_pkt = NSH(payload_data[8:32])
+        if nsh_pkt.flags != sfccon.NSH_FLAGS:
+            raise RuntimeError("Unexpected NSH flags: {0}".
+                               format(nsh_pkt.flags))
+
+        if nsh_pkt.length != sfccon.NSH_HEADER_LENGTH:
+            raise RuntimeError("NSH length {0} incorrect".
+                               format(nsh_pkt.length))
+
+        if nsh_pkt.MDtype != sfccon.NSH_DEFAULT_MDTYPE:
+            raise RuntimeError("NSH MD-Type {0} incorrect".
+                               format(nsh_pkt.MDtype))
+
+        if nsh_pkt.nextproto != sfccon.NSH_NEXT_PROTOCOL:
+            raise RuntimeError("NSH next protocol {0} incorrect".
+                               format(nsh_pkt.nextproto))
+
+        if test_type == "Proxy Outbound" or test_type == "SFF":
+            expect_nsi = sfccon.NSH_DEFAULT_NSI - 1
+        else:
+            expect_nsi = sfccon.NSH_DEFAULT_NSI
+
+        nsp_nsi = nsh_pkt.nsp_nsi
+        nsp = nsp_nsi >> 8
+        nsi = nsp_nsi & 0x000000FF
+        if nsp != sfccon.NSH_DEFAULT_NSP:
+            raise RuntimeError("NSH Service Path ID {0} incorrect".format(nsp))
+
+        if nsi != expect_nsi:
+            raise RuntimeError("NSH Service Index {0} incorrect".format(nsi))
+
+        nsh_c1 = nsh_pkt.c1
+        if nsh_c1 != sfccon.NSH_DEFAULT_C1:
+            raise RuntimeError("NSH c1 {0} incorrect".format(nsh_c1))
+
+        nsh_c2 = nsh_pkt.c2
+        if nsh_c2 != sfccon.NSH_DEFAULT_C2:
+            raise RuntimeError("NSH c2 {0} incorrect".format(nsh_c2))
+
+        nsh_c3 = nsh_pkt.c3
+        if nsh_c3 != sfccon.NSH_DEFAULT_C3:
+            raise RuntimeError("NSH c3 {0} incorrect".format(nsh_c3))
+
+        nsh_c4 = nsh_pkt.c4
+        if nsh_c4 != sfccon.NSH_DEFAULT_C4:
+            raise RuntimeError("NSH c4 {0} incorrect".format(nsh_c4))
+
+
+    @staticmethod
+    def check_the_nsh_sfc_packet(frame_size, test_type):
+        """
+        verify the NSH SFC functional test loopback packet field
+        is correct.
+
+        :param frame_size: the origin frame size.
+        :param test_type: the test type.
+                         (Classifier, Proxy Inbound, Proxy Outbound, SFF).
+        :type frame_size: Integer
+        :type test_type: str
+        :returns: none
+        :raises RuntimeError: If the packet field verify fails.
+        """
+
+        rx_pcapfile = '{0}/nsh_sfc_tests/sfc_scripts/temp_packet.pcap' \
+                      .format(con.REMOTE_FW_DIR)
+
+        logger.trace('read pcap file:{0}'.format(rx_pcapfile))
+
+        packets = rdpcap(rx_pcapfile)
+        if len(packets) < 1:
+            raise RuntimeError("No packet is received!")
+
+        ether = packets[0]
+
+        origin_size = int(frame_size)
+        if test_type == "Classifier":
+            expect_pkt_len = origin_size + 74 - 4
+        elif test_type == "Proxy Inbound":
+            expect_pkt_len = origin_size - 24 - 4
+        elif test_type == "Proxy Outbound":
+            expect_pkt_len = origin_size + 24 - 4
+        else:
+            expect_pkt_len = origin_size - 4
+
+        recv_pkt_len = len(ether)
+        if recv_pkt_len != expect_pkt_len:
+            raise RuntimeError("Received packet size {0} not " \
+                               "the expect size {1}".format(recv_pkt_len, \
+                               expect_pkt_len))
+
+        if not ether.haslayer(IP):
+            raise RuntimeError("Not a IPv4 packet")
+
+        pkt_proto = ether[IP].proto
+        if pkt_proto != sfccon.UDP_PROTOCOL:
+            raise RuntimeError("Not a UDP packet , {0}".format(pkt_proto))
+
+        if test_type == "Proxy Inbound":
+            expect_udp_port = sfccon.VxLAN_UDP_PORT
+        else:
+            expect_udp_port = sfccon.VxLANGPE_UDP_PORT
+
+        dst_port = ether[UDP].dport
+        if dst_port != expect_udp_port:
+            raise RuntimeError("UDP dest port must be {0}, {1}".
+                               format(expect_udp_port, dst_port))
+
+        payload_data = ether[Raw].load
+
+        if test_type == "Proxy Inbound":
+            VerifyPacket.check_vxlan_protocol(payload_data)
+        else:
+            VerifyPacket.check_vxlangpe_nsh_protocol(payload_data, test_type)
diff --git a/resources/libraries/python/SFC/__init__.py b/resources/libraries/python/SFC/__init__.py
new file mode 100644
index 0000000000..e90d968cca
--- /dev/null
+++ b/resources/libraries/python/SFC/__init__.py
@@ -0,0 +1,16 @@
+# Copyright (c) 2017 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.
+
+"""
+__init__ file for directory resources/libraries/python/SFC
+"""