#!/usr/bin/env python3

import unittest
import binascii
from socket import AF_INET6

from framework import VppTestCase, VppTestRunner
from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto, VppIpTable
from vpp_srv6 import SRv6LocalSIDBehaviors, VppSRv6LocalSID, VppSRv6Policy, \
    SRv6PolicyType, VppSRv6Steering, SRv6PolicySteeringTypes

import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q
from scapy.layers.inet6 import IPv6, UDP, IPv6ExtHdrSegmentRouting
from scapy.layers.inet import IP, UDP

from util import ppp


class TestSRv6(VppTestCase):
    """ SRv6 Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestSRv6, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestSRv6, cls).tearDownClass()

    def setUp(self):
        """ Perform test setup before each test case.
        """
        super(TestSRv6, self).setUp()

        # packet sizes, inclusive L2 overhead
        self.pg_packet_sizes = [64, 512, 1518, 9018]

        # reset packet_infos
        self.reset_packet_infos()

    def tearDown(self):
        """ Clean up test setup after each test case.
        """
        self.teardown_interfaces()

        super(TestSRv6, self).tearDown()

    def configure_interface(self,
                            interface,
                            ipv6=False, ipv4=False,
                            ipv6_table_id=0, ipv4_table_id=0):
        """ Configure interface.
        :param ipv6: configure IPv6 on interface
        :param ipv4: configure IPv4 on interface
        :param ipv6_table_id: FIB table_id for IPv6
        :param ipv4_table_id: FIB table_id for IPv4
        """
        self.logger.debug("Configuring interface %s" % (interface.name))
        if ipv6:
            self.logger.debug("Configuring IPv6")
            interface.set_table_ip6(ipv6_table_id)
            interface.config_ip6()
            interface.resolve_ndp(timeout=5)
        if ipv4:
            self.logger.debug("Configuring IPv4")
            interface.set_table_ip4(ipv4_table_id)
            interface.config_ip4()
            interface.resolve_arp()
        interface.admin_up()

    def setup_interfaces(self, ipv6=[], ipv4=[],
                         ipv6_table_id=[], ipv4_table_id=[]):
        """ Create and configure interfaces.

        :param ipv6: list of interface IPv6 capabilities
        :param ipv4: list of interface IPv4 capabilities
        :param ipv6_table_id: list of intf IPv6 FIB table_ids
        :param ipv4_table_id: list of intf IPv4 FIB table_ids
        :returns: List of created interfaces.
        """
        # how many interfaces?
        if len(ipv6):
            count = len(ipv6)
        else:
            count = len(ipv4)
        self.logger.debug("Creating and configuring %d interfaces" % (count))

        # fill up ipv6 and ipv4 lists if needed
        # not enabled (False) is the default
        if len(ipv6) < count:
            ipv6 += (count - len(ipv6)) * [False]
        if len(ipv4) < count:
            ipv4 += (count - len(ipv4)) * [False]

        # fill up table_id lists if needed
        # table_id 0 (global) is the default
        if len(ipv6_table_id) < count:
            ipv6_table_id += (count - len(ipv6_table_id)) * [0]
        if len(ipv4_table_id) < count:
            ipv4_table_id += (count - len(ipv4_table_id)) * [0]

        # create 'count' pg interfaces
        self.create_pg_interfaces(range(count))

        # setup all interfaces
        for i in range(count):
            intf = self.pg_interfaces[i]
            self.configure_interface(intf,
                                     ipv6[i], ipv4[i],
                                     ipv6_table_id[i], ipv4_table_id[i])

        if any(ipv6):
            self.logger.debug(self.vapi.cli("show ip6 neighbors"))
        if any(ipv4):
            self.logger.debug(self.vapi.cli("show ip4 neighbors"))
        self.logger.debug(self.vapi.cli("show interface"))
        self.logger.debug(self.vapi.cli("show hardware"))

        return self.pg_interfaces

    def teardown_interfaces(self):
        """ Unconfigure and bring down interface.
        """
        self.logger.debug("Tearing down interfaces")
        # tear down all interfaces
        # AFAIK they cannot be deleted
        for i in self.pg_interfaces:
            self.logger.debug("Tear down interface %s" % (i.name))
            i.admin_down()
            i.unconfig()
            i.set_table_ip4(0)
            i.set_table_ip6(0)

    @unittest.skipUnless(0, "PC to fix")
    def test_SRv6_T_Encaps(self):
        """ Test SRv6 Transit.Encaps behavior for IPv6.
        """
        # send traffic to one destination interface
        # source and destination are IPv6 only
        self.setup_interfaces(ipv6=[True, True])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure encaps IPv6 source address
        # needs to be done before SR Policy config
        # TODO: API?
        self.vapi.cli("set sr encaps source addr a3::")

        bsid = 'a3::9999:1'
        # configure SRv6 Policy
        # Note: segment list order: first -> last
        sr_policy = VppSRv6Policy(
            self, bsid=bsid,
            is_encap=1,
            sr_type=SRv6PolicyType.SR_POLICY_TYPE_DEFAULT,
            weight=1, fib_table=0,
            segments=['a4::', 'a5::', 'a6::c7'],
            source='a3::')
        sr_policy.add_vpp_config()
        self.sr_policy = sr_policy

        # log the sr policies
        self.logger.info(self.vapi.cli("show sr policies"))

        # steer IPv6 traffic to a7::/64 into SRv6 Policy
        # use the bsid of the above self.sr_policy
        pol_steering = VppSRv6Steering(
                        self,
                        bsid=self.sr_policy.bsid,
                        prefix="a7::", mask_width=64,
                        traffic_type=SRv6PolicySteeringTypes.SR_STEER_IPV6,
                        sr_policy_index=0, table_id=0,
                        sw_if_index=0)
        pol_steering.add_vpp_config()

        # log the sr steering policies
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # create packets
        count = len(self.pg_packet_sizes)
        dst_inner = 'a7::1234'
        pkts = []

        # create IPv6 packets without SRH
        packet_header = self.create_packet_header_IPv6(dst_inner)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # create IPv6 packets with SRH
        # packets with segments-left 1, active segment a7::
        packet_header = self.create_packet_header_IPv6_SRH(
            sidlist=['a8::', 'a7::', 'a6::'],
            segleft=1)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # create IPv6 packets with SRH and IPv6
        # packets with segments-left 1, active segment a7::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
            dst_inner,
            sidlist=['a8::', 'a7::', 'a6::'],
            segleft=1)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_T_Encaps)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SR steering
        pol_steering.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # remove SR Policies
        self.sr_policy.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr policies"))

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    @unittest.skipUnless(0, "PC to fix")
    def test_SRv6_T_Insert(self):
        """ Test SRv6 Transit.Insert behavior (IPv6 only).
        """
        # send traffic to one destination interface
        # source and destination are IPv6 only
        self.setup_interfaces(ipv6=[True, True])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure encaps IPv6 source address
        # needs to be done before SR Policy config
        # TODO: API?
        self.vapi.cli("set sr encaps source addr a3::")

        bsid = 'a3::9999:1'
        # configure SRv6 Policy
        # Note: segment list order: first -> last
        sr_policy = VppSRv6Policy(
            self, bsid=bsid,
            is_encap=0,
            sr_type=SRv6PolicyType.SR_POLICY_TYPE_DEFAULT,
            weight=1, fib_table=0,
            segments=['a4::', 'a5::', 'a6::c7'],
            source='a3::')
        sr_policy.add_vpp_config()
        self.sr_policy = sr_policy

        # log the sr policies
        self.logger.info(self.vapi.cli("show sr policies"))

        # steer IPv6 traffic to a7::/64 into SRv6 Policy
        # use the bsid of the above self.sr_policy
        pol_steering = VppSRv6Steering(
                        self,
                        bsid=self.sr_policy.bsid,
                        prefix="a7::", mask_width=64,
                        traffic_type=SRv6PolicySteeringTypes.SR_STEER_IPV6,
                        sr_policy_index=0, table_id=0,
                        sw_if_index=0)
        pol_steering.add_vpp_config()

        # log the sr steering policies
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # create packets
        count = len(self.pg_packet_sizes)
        dst_inner = 'a7::1234'
        pkts = []

        # create IPv6 packets without SRH
        packet_header = self.create_packet_header_IPv6(dst_inner)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # create IPv6 packets with SRH
        # packets with segments-left 1, active segment a7::
        packet_header = self.create_packet_header_IPv6_SRH(
            sidlist=['a8::', 'a7::', 'a6::'],
            segleft=1)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_T_Insert)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SR steering
        pol_steering.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # remove SR Policies
        self.sr_policy.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr policies"))

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    @unittest.skipUnless(0, "PC to fix")
    def test_SRv6_T_Encaps_IPv4(self):
        """ Test SRv6 Transit.Encaps behavior for IPv4.
        """
        # send traffic to one destination interface
        # source interface is IPv4 only
        # destination interface is IPv6 only
        self.setup_interfaces(ipv6=[False, True], ipv4=[True, False])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure encaps IPv6 source address
        # needs to be done before SR Policy config
        # TODO: API?
        self.vapi.cli("set sr encaps source addr a3::")

        bsid = 'a3::9999:1'
        # configure SRv6 Policy
        # Note: segment list order: first -> last
        sr_policy = VppSRv6Policy(
            self, bsid=bsid,
            is_encap=1,
            sr_type=SRv6PolicyType.SR_POLICY_TYPE_DEFAULT,
            weight=1, fib_table=0,
            segments=['a4::', 'a5::', 'a6::c7'],
            source='a3::')
        sr_policy.add_vpp_config()
        self.sr_policy = sr_policy

        # log the sr policies
        self.logger.info(self.vapi.cli("show sr policies"))

        # steer IPv4 traffic to 7.1.1.0/24 into SRv6 Policy
        # use the bsid of the above self.sr_policy
        pol_steering = VppSRv6Steering(
                        self,
                        bsid=self.sr_policy.bsid,
                        prefix="7.1.1.0", mask_width=24,
                        traffic_type=SRv6PolicySteeringTypes.SR_STEER_IPV4,
                        sr_policy_index=0, table_id=0,
                        sw_if_index=0)
        pol_steering.add_vpp_config()

        # log the sr steering policies
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # create packets
        count = len(self.pg_packet_sizes)
        dst_inner = '7.1.1.123'
        pkts = []

        # create IPv4 packets
        packet_header = self.create_packet_header_IPv4(dst_inner)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_T_Encaps_IPv4)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SR steering
        pol_steering.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # remove SR Policies
        self.sr_policy.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr policies"))

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    @unittest.skip("VPP crashes after running this test")
    def test_SRv6_T_Encaps_L2(self):
        """ Test SRv6 Transit.Encaps behavior for L2.
        """
        # send traffic to one destination interface
        # source interface is IPv4 only TODO?
        # destination interface is IPv6 only
        self.setup_interfaces(ipv6=[False, True], ipv4=[False, False])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure encaps IPv6 source address
        # needs to be done before SR Policy config
        # TODO: API?
        self.vapi.cli("set sr encaps source addr a3::")

        bsid = 'a3::9999:1'
        # configure SRv6 Policy
        # Note: segment list order: first -> last
        sr_policy = VppSRv6Policy(
            self, bsid=bsid,
            is_encap=1,
            sr_type=SRv6PolicyType.SR_POLICY_TYPE_DEFAULT,
            weight=1, fib_table=0,
            segments=['a4::', 'a5::', 'a6::c7'],
            source='a3::')
        sr_policy.add_vpp_config()
        self.sr_policy = sr_policy

        # log the sr policies
        self.logger.info(self.vapi.cli("show sr policies"))

        # steer L2 traffic into SRv6 Policy
        # use the bsid of the above self.sr_policy
        pol_steering = VppSRv6Steering(
                        self,
                        bsid=self.sr_policy.bsid,
                        prefix="::", mask_width=0,
                        traffic_type=SRv6PolicySteeringTypes.SR_STEER_L2,
                        sr_policy_index=0, table_id=0,
                        sw_if_index=self.pg0.sw_if_index)
        pol_steering.add_vpp_config()

        # log the sr steering policies
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # create packets
        count = len(self.pg_packet_sizes)
        pkts = []

        # create L2 packets without dot1q header
        packet_header = self.create_packet_header_L2()
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # create L2 packets with dot1q header
        packet_header = self.create_packet_header_L2(vlan=123)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_T_Encaps_L2)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SR steering
        pol_steering.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # remove SR Policies
        self.sr_policy.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr policies"))

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End(self):
        """ Test SRv6 End (without PSP) behavior.
        """
        # send traffic to one destination interface
        # source and destination interfaces are IPv6 only
        self.setup_interfaces(ipv6=[True, True])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure SRv6 localSID End without PSP behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::0',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_END,
                        nh_addr=0,
                        end_psp=0,
                        sw_if_index=0,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=2, SL=1, SL=0)
        # send one packet per SL value per packet size
        # SL=0 packet with localSID End with USP needs 2nd SRH
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'
        pkts = []

        # packets with segments-left 2, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                dst_inner,
                sidlist=['a5::', 'a4::', 'a3::'],
                segleft=2)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets with segments-left 1, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                dst_inner,
                sidlist=['a4::', 'a3::', 'a2::'],
                segleft=1)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # TODO: test behavior with SL=0 packet (needs 2*SRH?)

        expected_count = len(pkts)

        # packets without SRH (should not crash)
        packet_header = self.create_packet_header_IPv6('a3::')
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End,
                                  expected_count=expected_count)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_with_PSP(self):
        """ Test SRv6 End with PSP behavior.
        """
        # send traffic to one destination interface
        # source and destination interfaces are IPv6 only
        self.setup_interfaces(ipv6=[True, True])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index)])
        route.add_vpp_config()

        # configure SRv6 localSID End with PSP behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::0',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_END,
                        nh_addr=0,
                        end_psp=1,
                        sw_if_index=0,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=2, SL=1)
        # send one packet per SL value per packet size
        # SL=0 packet with localSID End with PSP is dropped
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'
        pkts = []

        # packets with segments-left 2, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a5::', 'a4::', 'a3::'],
                    segleft=2)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets with segments-left 1, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a4::', 'a3::', 'a2::'],
                    segleft=1)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End_PSP)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_X(self):
        """ Test SRv6 End.X (without PSP) behavior.
        """
        # create three interfaces (1 source, 2 destinations)
        # source and destination interfaces are IPv6 only
        self.setup_interfaces(ipv6=[True, True, True])

        # configure FIB entries
        # a4::/64 via pg1 and pg2
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(self.pg1.remote_ip6,
                                         self.pg1.sw_if_index),
                            VppRoutePath(self.pg2.remote_ip6,
                                         self.pg2.sw_if_index)])
        route.add_vpp_config()
        self.logger.debug(self.vapi.cli("show ip6 fib"))

        # configure SRv6 localSID End.X without PSP behavior
        # End.X points to interface pg1
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_X,
                        nh_addr=self.pg1.remote_ip6,
                        end_psp=0,
                        sw_if_index=self.pg1.sw_if_index,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=2, SL=1)
        # send one packet per SL value per packet size
        # SL=0 packet with localSID End with PSP is dropped
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'
        pkts = []

        # packets with segments-left 2, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a5::', 'a4::', 'a3::c4'],
                    segleft=2)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets with segments-left 1, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a4::', 'a3::c4', 'a2::'],
                    segleft=1)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        # using same comparison function as End (no PSP)
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End)

        # assert nothing was received on the other interface (pg2)
        self.pg2.assert_nothing_captured("mis-directed packet(s)")

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_X_with_PSP(self):
        """ Test SRv6 End.X with PSP behavior.
        """
        # create three interfaces (1 source, 2 destinations)
        # source and destination interfaces are IPv6 only
        self.setup_interfaces(ipv6=[True, True, True])

        # configure FIB entries
        # a4::/64 via pg1 and pg2
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(
                               self.pg1.remote_ip6,
                               self.pg1.sw_if_index),
                            VppRoutePath(self.pg2.remote_ip6,
                                         self.pg2.sw_if_index)])
        route.add_vpp_config()

        # configure SRv6 localSID End with PSP behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_X,
                        nh_addr=self.pg1.remote_ip6,
                        end_psp=1,
                        sw_if_index=self.pg1.sw_if_index,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=2, SL=1)
        # send one packet per SL value per packet size
        # SL=0 packet with localSID End with PSP is dropped
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'
        pkts = []

        # packets with segments-left 2, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a5::', 'a4::', 'a3::c4'],
                    segleft=2)
        # create traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets with segments-left 1, active segment a3::
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                    dst_inner,
                    sidlist=['a4::', 'a3::c4', 'a2::'],
                    segleft=1)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        # using same comparison function as End with PSP
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End_PSP)

        # assert nothing was received on the other interface (pg2)
        self.pg2.assert_nothing_captured("mis-directed packet(s)")

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_DX6(self):
        """ Test SRv6 End.DX6 behavior.
        """
        # send traffic to one destination interface
        # source and destination interfaces are IPv6 only
        self.setup_interfaces(ipv6=[True, True])

        # configure SRv6 localSID End.DX6 behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_DX6,
                        nh_addr=self.pg1.remote_ip6,
                        end_psp=0,
                        sw_if_index=self.pg1.sw_if_index,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=0)
        # send one packet per packet size
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'  # inner header destination address
        pkts = []

        # packets with SRH, segments-left 0, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                        dst_inner,
                        sidlist=['a3::c4', 'a2::', 'a1::'],
                        segleft=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, IPv6 in IPv6
        # outer IPv6 dest addr is the localsid End.DX6
        packet_header = self.create_packet_header_IPv6_IPv6(
                                            dst_inner,
                                            dst_outer='a3::c4')
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End_DX6)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_DT6(self):
        """ Test SRv6 End.DT6 behavior.
        """
        # create three interfaces (1 source, 2 destinations)
        # all interfaces are IPv6 only
        # source interface in global FIB (0)
        # destination interfaces in global and vrf
        vrf_1 = 1
        ipt = VppIpTable(self, vrf_1, is_ip6=True)
        ipt.add_vpp_config()
        self.setup_interfaces(ipv6=[True, True, True],
                              ipv6_table_id=[0, 0, vrf_1])

        # configure FIB entries
        # a4::/64 is reachable
        #     via pg1 in table 0 (global)
        #     and via pg2 in table vrf_1
        route0 = VppIpRoute(self, "a4::", 64,
                            [VppRoutePath(self.pg1.remote_ip6,
                                          self.pg1.sw_if_index,
                                          nh_table_id=0)],
                            table_id=0)
        route0.add_vpp_config()
        route1 = VppIpRoute(self, "a4::", 64,
                            [VppRoutePath(self.pg2.remote_ip6,
                                          self.pg2.sw_if_index,
                                          nh_table_id=vrf_1)],
                            table_id=vrf_1)
        route1.add_vpp_config()
        self.logger.debug(self.vapi.cli("show ip6 fib"))

        # configure SRv6 localSID End.DT6 behavior
        # Note:
        # fib_table: where the localsid is installed
        # sw_if_index: in T-variants of localsid this is the vrf table_id
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_DT6,
                        nh_addr=0,
                        end_psp=0,
                        sw_if_index=vrf_1,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=0)
        # send one packet per packet size
        count = len(self.pg_packet_sizes)
        dst_inner = 'a4::1234'  # inner header destination address
        pkts = []

        # packets with SRH, segments-left 0, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv6(
                        dst_inner,
                        sidlist=['a3::c4', 'a2::', 'a1::'],
                        segleft=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg2, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, IPv6 in IPv6
        # outer IPv6 dest addr is the localsid End.DT6
        packet_header = self.create_packet_header_IPv6_IPv6(
                                            dst_inner,
                                            dst_outer='a3::c4')
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg2, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        # using same comparison function as End.DX6
        self.send_and_verify_pkts(self.pg0, pkts, self.pg2,
                                  self.compare_rx_tx_packet_End_DX6)

        # assert nothing was received on the other interface (pg2)
        self.pg1.assert_nothing_captured("mis-directed packet(s)")

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_DX4(self):
        """ Test SRv6 End.DX4 behavior.
        """
        # send traffic to one destination interface
        # source interface is IPv6 only
        # destination interface is IPv4 only
        self.setup_interfaces(ipv6=[True, False], ipv4=[False, True])

        # configure SRv6 localSID End.DX4 behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_DX4,
                        nh_addr=self.pg1.remote_ip4,
                        end_psp=0,
                        sw_if_index=self.pg1.sw_if_index,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # send one packet per packet size
        count = len(self.pg_packet_sizes)
        dst_inner = '4.1.1.123'  # inner header destination address
        pkts = []

        # packets with SRH, segments-left 0, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv4(
                        dst_inner,
                        sidlist=['a3::c4', 'a2::', 'a1::'],
                        segleft=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, IPv4 in IPv6
        # outer IPv6 dest addr is the localsid End.DX4
        packet_header = self.create_packet_header_IPv6_IPv4(
                                            dst_inner,
                                            dst_outer='a3::c4')
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End_DX4)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_DT4(self):
        """ Test SRv6 End.DT4 behavior.
        """
        # create three interfaces (1 source, 2 destinations)
        # source interface is IPv6-only
        # destination interfaces are IPv4 only
        # source interface in global FIB (0)
        # destination interfaces in global and vrf
        vrf_1 = 1
        ipt = VppIpTable(self, vrf_1)
        ipt.add_vpp_config()
        self.setup_interfaces(ipv6=[True, False, False],
                              ipv4=[False, True, True],
                              ipv6_table_id=[0, 0, 0],
                              ipv4_table_id=[0, 0, vrf_1])

        # configure FIB entries
        # 4.1.1.0/24 is reachable
        #     via pg1 in table 0 (global)
        #     and via pg2 in table vrf_1
        route0 = VppIpRoute(self, "4.1.1.0", 24,
                            [VppRoutePath(self.pg1.remote_ip4,
                                          self.pg1.sw_if_index,
                                          nh_table_id=0)],
                            table_id=0)
        route0.add_vpp_config()
        route1 = VppIpRoute(self, "4.1.1.0", 24,
                            [VppRoutePath(self.pg2.remote_ip4,
                                          self.pg2.sw_if_index,
                                          nh_table_id=vrf_1)],
                            table_id=vrf_1)
        route1.add_vpp_config()
        self.logger.debug(self.vapi.cli("show ip fib"))

        # configure SRv6 localSID End.DT6 behavior
        # Note:
        # fib_table: where the localsid is installed
        # sw_if_index: in T-variants of localsid: vrf table_id
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_DT4,
                        nh_addr=0,
                        end_psp=0,
                        sw_if_index=vrf_1,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # create IPv6 packets with SRH (SL=0)
        # send one packet per packet size
        count = len(self.pg_packet_sizes)
        dst_inner = '4.1.1.123'  # inner header destination address
        pkts = []

        # packets with SRH, segments-left 0, active segment a3::c4
        packet_header = self.create_packet_header_IPv6_SRH_IPv4(
                        dst_inner,
                        sidlist=['a3::c4', 'a2::', 'a1::'],
                        segleft=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg2, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, IPv6 in IPv6
        # outer IPv6 dest addr is the localsid End.DX4
        packet_header = self.create_packet_header_IPv6_IPv4(
                                            dst_inner,
                                            dst_outer='a3::c4')
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg2, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        # using same comparison function as End.DX4
        self.send_and_verify_pkts(self.pg0, pkts, self.pg2,
                                  self.compare_rx_tx_packet_End_DX4)

        # assert nothing was received on the other interface (pg2)
        self.pg1.assert_nothing_captured("mis-directed packet(s)")

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def test_SRv6_End_DX2(self):
        """ Test SRv6 End.DX2 behavior.
        """
        # send traffic to one destination interface
        # source interface is IPv6 only
        self.setup_interfaces(ipv6=[True, False], ipv4=[False, False])

        # configure SRv6 localSID End.DX2 behavior
        localsid = VppSRv6LocalSID(
                        self, localsid='A3::C4',
                        behavior=SRv6LocalSIDBehaviors.SR_BEHAVIOR_DX2,
                        nh_addr=0,
                        end_psp=0,
                        sw_if_index=self.pg1.sw_if_index,
                        vlan_index=0,
                        fib_table=0)
        localsid.add_vpp_config()
        # log the localsids
        self.logger.debug(self.vapi.cli("show sr localsid"))

        # send one packet per packet size
        count = len(self.pg_packet_sizes)
        pkts = []

        # packets with SRH, segments-left 0, active segment a3::c4
        # L2 has no dot1q header
        packet_header = self.create_packet_header_IPv6_SRH_L2(
                            sidlist=['a3::c4', 'a2::', 'a1::'],
                            segleft=0,
                            vlan=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets with SRH, segments-left 0, active segment a3::c4
        # L2 has dot1q header
        packet_header = self.create_packet_header_IPv6_SRH_L2(
                            sidlist=['a3::c4', 'a2::', 'a1::'],
                            segleft=0,
                            vlan=123)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, L2 in IPv6
        # outer IPv6 dest addr is the localsid End.DX2
        # L2 has no dot1q header
        packet_header = self.create_packet_header_IPv6_L2(
                                            dst_outer='a3::c4',
                                            vlan=0)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # packets without SRH, L2 in IPv6
        # outer IPv6 dest addr is the localsid End.DX2
        # L2 has dot1q header
        packet_header = self.create_packet_header_IPv6_L2(
                                            dst_outer='a3::c4',
                                            vlan=123)
        # add to traffic stream pg0->pg1
        pkts.extend(self.create_stream(self.pg0, self.pg1, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg0, pkts, self.pg1,
                                  self.compare_rx_tx_packet_End_DX2)

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove SRv6 localSIDs
        localsid.remove_vpp_config()

        # cleanup interfaces
        self.teardown_interfaces()

    @unittest.skipUnless(0, "PC to fix")
    def test_SRv6_T_Insert_Classifier(self):
        """ Test SRv6 Transit.Insert behavior (IPv6 only).
            steer packets using the classifier
        """
        # send traffic to one destination interface
        # source and destination are IPv6 only
        self.setup_interfaces(ipv6=[False, False, False, True, True])

        # configure FIB entries
        route = VppIpRoute(self, "a4::", 64,
                           [VppRoutePath(
                               self.pg4.remote_ip6,
                               self.pg4.sw_if_index)])
        route.add_vpp_config()

        # configure encaps IPv6 source address
        # needs to be done before SR Policy config
        # TODO: API?
        self.vapi.cli("set sr encaps source addr a3::")

        bsid = 'a3::9999:1'
        # configure SRv6 Policy
        # Note: segment list order: first -> last
        sr_policy = VppSRv6Policy(
            self, bsid=bsid,
            is_encap=0,
            sr_type=SRv6PolicyType.SR_POLICY_TYPE_DEFAULT,
            weight=1, fib_table=0,
            segments=['a4::', 'a5::', 'a6::c7'],
            source='a3::')
        sr_policy.add_vpp_config()
        self.sr_policy = sr_policy

        # log the sr policies
        self.logger.info(self.vapi.cli("show sr policies"))

        # add classify table
        # mask on dst ip address prefix a7::/8
        mask = '{!s:0<16}'.format('ff')
        r = self.vapi.classify_add_del_table(
            1,
            binascii.unhexlify(mask),
            match_n_vectors=(len(mask) - 1) // 32 + 1,
            current_data_flag=1,
            skip_n_vectors=2)  # data offset
        self.assertIsNotNone(r, 'No response msg for add_del_table')
        table_index = r.new_table_index

        # add the source routing node as a ip6 inacl netxt node
        r = self.vapi.add_node_next('ip6-inacl',
                                    'sr-pl-rewrite-insert')
        inacl_next_node_index = r.node_index

        match = '{!s:0<16}'.format('a7')
        r = self.vapi.classify_add_del_session(
            1,
            table_index,
            binascii.unhexlify(match),
            hit_next_index=inacl_next_node_index,
            action=3,
            metadata=0)  # sr policy index
        self.assertIsNotNone(r, 'No response msg for add_del_session')

        # log the classify table used in the steering policy
        self.logger.info(self.vapi.cli("show classify table"))

        r = self.vapi.input_acl_set_interface(
            is_add=1,
            sw_if_index=self.pg3.sw_if_index,
            ip6_table_index=table_index)
        self.assertIsNotNone(r,
                             'No response msg for input_acl_set_interface')

        # log the ip6 inacl
        self.logger.info(self.vapi.cli("show inacl type ip6"))

        # create packets
        count = len(self.pg_packet_sizes)
        dst_inner = 'a7::1234'
        pkts = []

        # create IPv6 packets without SRH
        packet_header = self.create_packet_header_IPv6(dst_inner)
        # create traffic stream pg3->pg4
        pkts.extend(self.create_stream(self.pg3, self.pg4, packet_header,
                                       self.pg_packet_sizes, count))

        # create IPv6 packets with SRH
        # packets with segments-left 1, active segment a7::
        packet_header = self.create_packet_header_IPv6_SRH(
            sidlist=['a8::', 'a7::', 'a6::'],
            segleft=1)
        # create traffic stream pg3->pg4
        pkts.extend(self.create_stream(self.pg3, self.pg4, packet_header,
                                       self.pg_packet_sizes, count))

        # send packets and verify received packets
        self.send_and_verify_pkts(self.pg3, pkts, self.pg4,
                                  self.compare_rx_tx_packet_T_Insert)

        # remove the interface l2 input feature
        r = self.vapi.input_acl_set_interface(
            is_add=0,
            sw_if_index=self.pg3.sw_if_index,
            ip6_table_index=table_index)
        self.assertIsNotNone(r,
                             'No response msg for input_acl_set_interface')

        # log the ip6 inacl after cleaning
        self.logger.info(self.vapi.cli("show inacl type ip6"))

        # log the localsid counters
        self.logger.info(self.vapi.cli("show sr localsid"))

        # remove classifier SR steering
        # classifier_steering.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr steering policies"))

        # remove SR Policies
        self.sr_policy.remove_vpp_config()
        self.logger.info(self.vapi.cli("show sr policies"))

        # remove classify session and table
        r = self.vapi.classify_add_del_session(
            0,
            table_index,
            binascii.unhexlify(match))
        self.assertIsNotNone(r, 'No response msg for add_del_session')

        r = self.vapi.classify_add_del_table(
            0,
            binascii.unhexlify(mask),
            table_index=table_index)
        self.assertIsNotNone(r, 'No response msg for add_del_table')

        self.logger.info(self.vapi.cli("show classify table"))

        # remove FIB entries
        # done by tearDown

        # cleanup interfaces
        self.teardown_interfaces()

    def compare_rx_tx_packet_T_Encaps(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing T.Encaps

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # T.Encaps updates the headers as follows:
        # SR Policy seglist (S3, S2, S1)
        # SR Policy source C
        # IPv6:
        # in: IPv6(A, B2)
        # out: IPv6(C, S1)SRH(S3, S2, S1; SL=2)IPv6(A, B2)
        # IPv6 + SRH:
        # in: IPv6(A, B2)SRH(B3, B2, B1; SL=1)
        # out: IPv6(C, S1)SRH(S3, S2, S1; SL=2)IPv6(a, B2)SRH(B3, B2, B1; SL=1)

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None

        tx_ip = tx_pkt.getlayer(IPv6)

        # expected segment-list
        seglist = self.sr_policy.segments
        # reverse list to get order as in SRH
        tx_seglist = seglist[::-1]

        # get source address of SR Policy
        sr_policy_source = self.sr_policy.source

        # rx'ed packet should have SRH
        self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
        # get SRH
        rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

        # received ip.src should be equal to SR Policy source
        self.assertEqual(rx_ip.src, sr_policy_source)
        # received ip.dst should be equal to expected sidlist[lastentry]
        self.assertEqual(rx_ip.dst, tx_seglist[-1])
        # rx'ed seglist should be equal to expected seglist
        self.assertEqual(rx_srh.addresses, tx_seglist)
        # segleft should be equal to size expected seglist-1
        self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
        # segleft should be equal to lastentry
        self.assertEqual(rx_srh.segleft, rx_srh.lastentry)

        # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
        # except for the hop-limit field
        #   -> update tx'ed hlim to the expected hlim
        tx_ip.hlim = tx_ip.hlim - 1

        self.assertEqual(rx_srh.payload, tx_ip)

        self.logger.debug("packet verification: SUCCESS")

    def compare_rx_tx_packet_T_Encaps_IPv4(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing T.Encaps for IPv4

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # T.Encaps for IPv4 updates the headers as follows:
        # SR Policy seglist (S3, S2, S1)
        # SR Policy source C
        # IPv4:
        # in: IPv4(A, B2)
        # out: IPv6(C, S1)SRH(S3, S2, S1; SL=2)IPv4(A, B2)

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None

        tx_ip = tx_pkt.getlayer(IP)

        # expected segment-list
        seglist = self.sr_policy.segments
        # reverse list to get order as in SRH
        tx_seglist = seglist[::-1]

        # get source address of SR Policy
        sr_policy_source = self.sr_policy.source

        # checks common to cases tx with and without SRH
        # rx'ed packet should have SRH and IPv4 header
        self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
        self.assertTrue(rx_ip.payload.haslayer(IP))
        # get SRH
        rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

        # received ip.src should be equal to SR Policy source
        self.assertEqual(rx_ip.src, sr_policy_source)
        # received ip.dst should be equal to sidlist[lastentry]
        self.assertEqual(rx_ip.dst, tx_seglist[-1])
        # rx'ed seglist should be equal to seglist
        self.assertEqual(rx_srh.addresses, tx_seglist)
        # segleft should be equal to size seglist-1
        self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
        # segleft should be equal to lastentry
        self.assertEqual(rx_srh.segleft, rx_srh.lastentry)

        # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
        # except for the ttl field and ip checksum
        #   -> adjust tx'ed ttl to expected ttl
        tx_ip.ttl = tx_ip.ttl - 1
        #   -> set tx'ed ip checksum to None and let scapy recompute
        tx_ip.chksum = None
        # read back the pkt (with str()) to force computing these fields
        # probably other ways to accomplish this are possible
        tx_ip = IP(scapy.compat.raw(tx_ip))

        self.assertEqual(rx_srh.payload, tx_ip)

        self.logger.debug("packet verification: SUCCESS")

    def compare_rx_tx_packet_T_Encaps_L2(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing T.Encaps for L2

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # T.Encaps for L2 updates the headers as follows:
        # SR Policy seglist (S3, S2, S1)
        # SR Policy source C
        # L2:
        # in: L2
        # out: IPv6(C, S1)SRH(S3, S2, S1; SL=2)L2

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None

        tx_ether = tx_pkt.getlayer(Ether)

        # expected segment-list
        seglist = self.sr_policy.segments
        # reverse list to get order as in SRH
        tx_seglist = seglist[::-1]

        # get source address of SR Policy
        sr_policy_source = self.sr_policy.source

        # rx'ed packet should have SRH
        self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
        # get SRH
        rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

        # received ip.src should be equal to SR Policy source
        self.assertEqual(rx_ip.src, sr_policy_source)
        # received ip.dst should be equal to sidlist[lastentry]
        self.assertEqual(rx_ip.dst, tx_seglist[-1])
        # rx'ed seglist should be equal to seglist
        self.assertEqual(rx_srh.addresses, tx_seglist)
        # segleft should be equal to size seglist-1
        self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
        # segleft should be equal to lastentry
        self.assertEqual(rx_srh.segleft, rx_srh.lastentry)
        # nh should be "No Next Header" (143)
        self.assertEqual(rx_srh.nh, 143)

        # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
        self.assertEqual(Ether(scapy.compat.raw(rx_srh.payload)), tx_ether)

        self.logger.debug("packet verification: SUCCESS")

    def compare_rx_tx_packet_T_Insert(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing T.Insert

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # T.Insert updates the headers as follows:
        # IPv6:
        # in: IPv6(A, B2)
        # out: IPv6(A, S1)SRH(B2, S3, S2, S1; SL=3)
        # IPv6 + SRH:
        # in: IPv6(A, B2)SRH(B3, B2, B1; SL=1)
        # out: IPv6(A, S1)SRH(B2, S3, S2, S1; SL=3)SRH(B3, B2, B1; SL=1)

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None
        rx_ip2 = None
        rx_srh2 = None
        rx_ip3 = None
        rx_udp = rx_pkt[UDP]

        tx_ip = tx_pkt.getlayer(IPv6)
        tx_srh = None
        tx_ip2 = None
        # some packets have been tx'ed with an SRH, some without it
        # get SRH if tx'ed packet has it
        if tx_pkt.haslayer(IPv6ExtHdrSegmentRouting):
            tx_srh = tx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
            tx_ip2 = tx_pkt.getlayer(IPv6, 2)
        tx_udp = tx_pkt[UDP]

        # expected segment-list (make copy of SR Policy segment list)
        seglist = self.sr_policy.segments[:]
        # expected seglist has initial dest addr as last segment
        seglist.append(tx_ip.dst)
        # reverse list to get order as in SRH
        tx_seglist = seglist[::-1]

        # get source address of SR Policy
        sr_policy_source = self.sr_policy.source

        # checks common to cases tx with and without SRH
        # rx'ed packet should have SRH and only one IPv6 header
        self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
        self.assertFalse(rx_ip.payload.haslayer(IPv6))
        # get SRH
        rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

        # rx'ed ip.src should be equal to tx'ed ip.src
        self.assertEqual(rx_ip.src, tx_ip.src)
        # rx'ed ip.dst should be equal to sidlist[lastentry]
        self.assertEqual(rx_ip.dst, tx_seglist[-1])

        # rx'ed seglist should be equal to expected seglist
        self.assertEqual(rx_srh.addresses, tx_seglist)
        # segleft should be equal to size(expected seglist)-1
        self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
        # segleft should be equal to lastentry
        self.assertEqual(rx_srh.segleft, rx_srh.lastentry)

        if tx_srh:  # packet was tx'ed with SRH
            # packet should have 2nd SRH
            self.assertTrue(rx_srh.payload.haslayer(IPv6ExtHdrSegmentRouting))
            # get 2nd SRH
            rx_srh2 = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting, 2)

            # rx'ed srh2.addresses should be equal to tx'ed srh.addresses
            self.assertEqual(rx_srh2.addresses, tx_srh.addresses)
            # rx'ed srh2.segleft should be equal to tx'ed srh.segleft
            self.assertEqual(rx_srh2.segleft, tx_srh.segleft)
            # rx'ed srh2.lastentry should be equal to tx'ed srh.lastentry
            self.assertEqual(rx_srh2.lastentry, tx_srh.lastentry)

        else:  # packet was tx'ed without SRH
            # rx packet should have no other SRH
            self.assertFalse(rx_srh.payload.haslayer(IPv6ExtHdrSegmentRouting))

        # UDP layer should be unchanged
        self.assertEqual(rx_udp, tx_udp)

        self.logger.debug("packet verification: SUCCESS")

    def compare_rx_tx_packet_End(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing End (without PSP)

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # End (no PSP) updates the headers as follows:
        # IPv6 + SRH:
        # in: IPv6(A, S1)SRH(S3, S2, S1; SL=2)
        # out: IPv6(A, S2)SRH(S3, S2, S1; SL=1)

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None
        rx_ip2 = None
        rx_udp = rx_pkt[UDP]

        tx_ip = tx_pkt.getlayer(IPv6)
        # we know the packet has been tx'ed
        # with an inner IPv6 header and an SRH
        tx_ip2 = tx_pkt.getlayer(IPv6, 2)
        tx_srh = tx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
        tx_udp = tx_pkt[UDP]

        # common checks, regardless of tx segleft value
        # rx'ed packet should have 2nd IPv6 header
        self.assertTrue(rx_ip.payload.haslayer(IPv6))
        # get second (inner) IPv6 header
        rx_ip2 = rx_pkt.getlayer(IPv6, 2)

        if tx_ip.segleft > 0:
            # SRH should NOT have been popped:
            #   End SID without PSP does not pop SRH if segleft>0
            self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
            rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

            # received ip.src should be equal to expected ip.src
            self.assertEqual(rx_ip.src, tx_ip.src)
            # sidlist should be unchanged
            self.assertEqual(rx_srh.addresses, tx_srh.addresses)
            # segleft should have been decremented
            self.assertEqual(rx_srh.segleft, tx_srh.segleft-1)
            # received ip.dst should be equal to sidlist[segleft]
            self.assertEqual(rx_ip.dst, rx_srh.addresses[rx_srh.segleft])
            # lastentry should be unchanged
            self.assertEqual(rx_srh.lastentry, tx_srh.lastentry)
            # inner IPv6 packet (ip2) should be unchanged
            self.assertEqual(rx_ip2.src, tx_ip2.src)
            self.assertEqual(rx_ip2.dst, tx_ip2.dst)
        # else:  # tx_ip.segleft == 0
            # TODO: Does this work with 2 SRHs in ingress packet?

        # UDP layer should be unchanged
        self.assertEqual(rx_udp, tx_udp)

        self.logger.debug("packet verification: SUCCESS")

    def compare_rx_tx_packet_End_PSP(self, tx_pkt, rx_pkt):
        """ Compare input and output packet after passing End with PSP

        :param tx_pkt: transmitted packet
        :param rx_pkt: received packet
        """
        # End (PSP) updates the headers as follows:
        # IPv6 + SRH (SL>1):
        # in: IPv6(A, S1)SRH(S3, S2, S1; SL=2)
        # out: IPv6(A, S2)SRH(S3, S2, S1; SL=1)
        # IPv6 + SRH (SL=1):
        # in: IPv6(A, S2)SRH(S3, S2, S1; SL=1)
        # out: IPv6(A, S3)

        # get first (outer) IPv6 header of rx'ed packet
        rx_ip = rx_pkt.getlayer(IPv6)
        rx_srh = None
        rx_ip2 = None
        rx_udp = rx_pkt[UDP]

        tx_ip = tx_pkt.getlayer(IPv6)
        # we know the packet has been tx'ed
        # with an inner IPv6 header and an SRH
        tx_ip2 = tx_pkt.getlayer(IPv6, 2)
        tx_srh = tx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
        tx_udp = tx_pkt[UDP]

        # common checks, regardless of tx segleft value
        self.assertTrue(rx_ip.payload.haslayer(IPv6))
        rx_ip2 = rx_pkt.getlayer(IPv6, 2)
        # inner IPv6 packet (ip2) should be unchanged
        self.assertEqual(rx_ip2.src, tx_ip2.src)
        self.assertEqual(rx_ip2.dst, tx_ip2.dst)

        if tx_ip.segleft > 1:
            # SRH should NOT have been popped:
            #   End SID with PSP does not pop SRH if segleft>1
            # rx'ed packet should have SRH
            self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
            rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)

            # received ip.src should be equal to expected ip.src
            self.assertEqual(rx_ip.src, tx_ip.src)
            # sidlist should be unchanged
            self.assertEqual(rx_srh.addresses, tx_srh.addresses)
            # segleft should have been decremented
            self.assertEqual(rx_srh.segleft, tx_srh.segleft-1)
            # received ip.dst should be equal to sidlist[segleft]
            self.assertEqual(rx_ip.dst, rx_srh.addresses[rx_srh.segleft])
            # lastentry should be unchanged
            self.assertEqual(rx_srh.lastentry, tx_srh.lastentry)

        else:  # tx_ip.segleft <= 1
            # SRH should have been popped:
            #   End SID with PSP and segleft=1 pops SRH
            # the two IPv6 headers are still present
            # outer IPv6 header has DA == last segment of popped SRH
            # SRH should not be present
            self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
            # outer IPv6 header ip.src should be equal to tx'ed ip.src
 s="ow">is</span> <span class="ow">not</span> <span class="bp">None</span> <span class="ow">and</span> <span class="n">p</span><span class="o">.</span><span class="n">haslayer</span><span class="p">(</span><span class="n">Template</span><span class="p">):</span>
                <span class="n">templates</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">[</span><span class="n">Template</span><span class="p">]</span><span class="o">.</span><span class="n">templateID</span><span class="p">)</span>
                <span class="n">decoder</span><span class="o">.</span><span class="n">add_template</span><span class="p">(</span><span class="n">p</span><span class="o">.</span><span class="n">getlayer</span><span class="p">(</span><span class="n">Template</span><span class="p">))</span>
        <span class="k">return</span> <span class="n">templates</span>


<span class="k">class</span> <span class="nc">MethodHolder</span><span class="p">(</span><span class="n">VppTestCase</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Flow-per-packet plugin: test L2, IP4, IP6 reporting &quot;&quot;&quot;</span>

    <span class="c1"># Test variables</span>
    <span class="n">debug_print</span> <span class="o">=</span> <span class="bp">False</span>
    <span class="n">max_number_of_packets</span> <span class="o">=</span> <span class="mi">10</span>
    <span class="n">pkts</span> <span class="o">=</span> <span class="p">[]</span>

    <span class="nd">@classmethod</span>
    <span class="k">def</span> <span class="nf">setUpClass</span><span class="p">(</span><span class="bp">cls</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Perform standard class setup (defined by class method setUpClass in</span>
<span class="sd">        class VppTestCase) before running the test case, set test case related</span>
<span class="sd">        variables and configure VPP.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">MethodHolder</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="n">setUpClass</span><span class="p">()</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="c1"># Create pg interfaces</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">create_pg_interfaces</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">9</span><span class="p">))</span>

            <span class="c1"># Packet sizes</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg_if_packet_sizes</span> <span class="o">=</span> <span class="p">[</span><span class="mi">64</span><span class="p">,</span> <span class="mi">512</span><span class="p">,</span> <span class="mi">1518</span><span class="p">,</span> <span class="mi">9018</span><span class="p">]</span>

            <span class="c1"># Create BD with MAC learning and unknown unicast flooding disabled</span>
            <span class="c1"># and put interfaces to this BD</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">vapi</span><span class="o">.</span><span class="n">bridge_domain_add_del</span><span class="p">(</span><span class="n">bd_id</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">uu_flood</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">learn</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">vapi</span><span class="o">.</span><span class="n">sw_interface_set_l2_bridge</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">pg1</span><span class="o">.</span><span class="n">_sw_if_index</span><span class="p">,</span> <span class="n">bd_id</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">vapi</span><span class="o">.</span><span class="n">sw_interface_set_l2_bridge</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">pg2</span><span class="o">.</span><span class="n">_sw_if_index</span><span class="p">,</span> <span class="n">bd_id</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>

            <span class="c1"># Set up all interfaces</span>
            <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="bp">cls</span><span class="o">.</span><span class="n">pg_interfaces</span><span class="p">:</span>
                <span class="n">i</span><span class="o">.</span><span class="n">admin_up</span><span class="p">()</span>

            <span class="bp">cls</span><span class="o">.</span><span class="n">pg0</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg0</span><span class="o">.</span><span class="n">configure_ipv4_neighbors</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">collector</span> <span class="o">=</span> <span class="bp">cls</span><span class="o">.</span><span class="n">pg0</span>

            <span class="bp">cls</span><span class="o">.</span><span class="n">pg1</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg1</span><span class="o">.</span><span class="n">resolve_arp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg2</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg2</span><span class="o">.</span><span class="n">resolve_arp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg3</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg3</span><span class="o">.</span><span class="n">resolve_arp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg4</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg4</span><span class="o">.</span><span class="n">resolve_arp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg7</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg8</span><span class="o">.</span><span class="n">config_ip4</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg8</span><span class="o">.</span><span class="n">configure_ipv4_neighbors</span><span class="p">()</span>

            <span class="bp">cls</span><span class="o">.</span><span class="n">pg5</span><span class="o">.</span><span class="n">config_ip6</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg5</span><span class="o">.</span><span class="n">resolve_ndp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg5</span><span class="o">.</span><span class="n">disable_ipv6_ra</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg6</span><span class="o">.</span><span class="n">config_ip6</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg6</span><span class="o">.</span><span class="n">resolve_ndp</span><span class="p">()</span>
            <span class="bp">cls</span><span class="o">.</span><span class="n">pg6</span><span class="o">.</span><span class="n">disable_ipv6_ra</span><span class="p">()</span>
        <span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
            <span class="nb">super</span><span class="p">(</span><span class="n">MethodHolder</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="n">tearDownClass</span><span class="p">()</span>
            <span class="k">raise</span>

    <span class="k">def</span> <span class="nf">create_stream</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">src_if</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">dst_if</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">packets</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span>
                      <span class="n">size</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">ip_ver</span><span class="o">=</span><span class="s1">&#39;v4&#39;</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Create a packet stream to tickle the plugin</span>

<span class="sd">        :param VppInterface src_if: Source interface for packet stream</span>
<span class="sd">        :param VppInterface src_if: Dst interface for packet stream</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="n">src_if</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
            <span class="n">src_if</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">pg1</span>
        <span class="k">if</span> <span class="n">dst_if</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
            <span class="n">dst_if</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">pg2</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">pkts</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="k">if</span> <span class="n">packets</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
            <span class="n">packets</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">randint</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_number_of_packets</span><span class="p">)</span>
        <span class="n">pkt_size</span> <span class="o">=</span> <span class="n">size</span>
        <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">packets</span><span class="p">):</span>
            <span class="k">if</span> <span class="n">size</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
                <span class="n">pkt_size</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">choice</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">pg_if_packet_sizes</span><span class="p">)</span>
            <span class="n">info</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">create_packet_info</span><span class="p">(</span><span class="n">src_if</span><span class="p">,</span> <span class="n">dst_if</span><span class="p">)</span>
            <span class="n">payload</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">info_to_payload</span><span class="p">(</span><span class="n">info</span><span class="p">)</span>
            <span class="n">p</span> <span class="o">=</span> <span class="n">Ether</span><span class="p">(</span><span class="n">src</span><span class="o">=</span><span class="n">src_if</span><span class="o">.</span><span class="n">remote_mac</span><span class="p">,</span> <span class="n">dst</span><span class="o">=</span><span class="n">src_if</span><span class="o">.</span><span class="n">local_mac</span><span class="p">)</span>
            <span class="k">if</span> <span class="n">ip_ver</span> <span class="o">==</span> <span class="s1">&#39;v4&#39;</span><span class="p">:</span>
                <span class="n">p</span> <span class="o">/=</span> <span class="n">IP</span><span class="p">(</span><span class="n">src</span><span class="o">=</span><span class="n">src_if</span><span class="o">.</span><span class="n">remote_ip4</span><span class="p">,</span> <span class="n">dst</span><span class="o">=</span><span class="n">dst_if</span><span class="o">.</span><span class="n">remote_ip4</span><span class="p">)</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">p</span> <span class="o">/=</span> <span class="n">IPv6</span><span class="p">(</span><span class="n">src</span><span class="o">=</span><span class="n">src_if</span><span class="o">.</span><span class="n">remote_ip6</span><span class="p">,</span> <span class="n">dst</span><span class="o">=</span><span class="n">dst_if</span><span class="o">.</span><span class="n">remote_ip6</span><span class="p">)</span>
            <span class="n">p</span> <span class="o">/=</span> <span class="n">UDP</span><span class="p">(</span><span class="n">sport</span><span class="o">=</span><span class="mi">1234</span><span class="p">,</span> <span class="n">dport</span><span class="o">=</span><span class="mi">4321</span><span class="p">)</span>
            <span class="n">p</span> <span class="o">/=</span> <span class="n">Raw</span><span class="p">(</span><span class="n">payload</span><span class="p">)</span>
            <span class="n">info</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="n">p</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">extend_packet</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="n">pkt_size</span><span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">pkts</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">verify_cflow_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">decoder</span><span class="p">,</span> <span class="n">capture</span><span class="p">,</span> <span class="n">cflow</span><span class="p">):</span>
        <span class="n">octets</span> <span class="o">=</span> <span class="mi">0</span>
        <span class="n">packets</span> <span class="o">=</span> <span class="mi">0</span>
        <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">capture</span><span class="p">:</span>
            <span class="n">octets</span> <span class="o">+=</span> <span class="n">p</span><span class="p">[</span><span class="n">IP</span><span class="p">]</span><span class="o">.</span><span class="n">len</span>
            <span class="n">packets</span> <span class="o">+=</span> <span class="mi">1</span>
        <span class="k">if</span> <span class="n">cflow</span><span class="o">.</span><span class="n">haslayer</span><span class="p">(</span><span class="n">Data</span><span class="p">):</span>
            <span class="n">data</span> <span class="o">=</span> <span class="n">decoder</span><span class="o">.</span><span class="n">decode_data_set</span><span class="p">(</span><span class="n">cflow</span><span class="o">.</span><span class="n">getlayer</span><span class="p">(</span><span class="n">Set</span><span class="p">))</span>
            <span class="k">for</span> <span class="n">record</span> <span class="ow">in</span> <span class="n">data</span><span class="p">:</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">record</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;hex&#39;</span><span class="p">),</span> <span class="mi">16</span><span class="p">),</span> <span class="n">octets</span><span class="p">)</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">record</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;hex&#39;</span><span class="p">),</span> <span class="mi">16</span><span class="p">),</span> <span class="n">packets</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">send_packets</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">src_if</span><span class="o">=</span><span class="bp">None</span><span class="p">,</span> <span class="n">dst_if</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
        <span class="k">if</span> <span class="n">src_if</spa