test/test_gbp.py

#!/usr/bin/env python

import unittest
import socket
import struct

from framework import VppTestCase, VppTestRunner
from vpp_object import VppObject
from vpp_neighbor import VppNeighbor
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, DpoProto

from scapy.packet import Raw
from scapy.layers.l2 import Ether, ARP
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6, ICMPv6ND_NS,  ICMPv6NDOptSrcLLAddr, \
    ICMPv6NDOptDstLLAddr, ICMPv6ND_NA
from scapy.utils6 import in6_getnsma, in6_getnsmac

from socket import AF_INET, AF_INET6
from scapy.utils import inet_pton, inet_ntop
from util import Host, mactobinary


class VppGbpEndpoint(VppObject):
    """
    GDB Endpoint
    """

    @property
    def bin_mac(self):
        return mactobinary(self.itf.remote_mac)

    @property
    def mac(self):
        return self.itf.remote_mac

    def __init__(self, test, itf, epg, recirc, ip, fip, is_ip6=False):
        self._test = test
        self.itf = itf
        self.epg = epg
        self.recirc = recirc
        self.ip = ip
        self.floating_ip = fip
        self.is_ip6 = is_ip6
        if is_ip6:
            self.proto = DpoProto.DPO_PROTO_IP6
            self.af = AF_INET6
            self.is_ip6 = True
            self.ip_len = 128
        else:
            self.proto = DpoProto.DPO_PROTO_IP4
            self.af = AF_INET
            self.is_ip6 = False
            self.ip_len = 32
        self.ip_n = inet_pton(self.af, ip)
        self.floating_ip_n = inet_pton(self.af, fip)

    def add_vpp_config(self):
        self._test.vapi.gbp_endpoint_add_del(
            1,
            self.itf.sw_if_index,
            self.ip_n,
            self.is_ip6,
            self.epg.epg)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.gbp_endpoint_add_del(
            0,
            self.itf.sw_if_index,
            self.ip_n,
            self.is_ip6,
            self.epg.epg)

    def __str__(self):
        return self.object_id()

    def object_id(self):
        return "gbp-endpoint;[%d:%s:%d]" % (self.itf.sw_if_index,
                                            self.ip,
                                            self.epg.epg)

    def query_vpp_config(self):
        eps = self._test.vapi.gbp_endpoint_dump()
        for ep in eps:
            if self.is_ip6:
                if ep.endpoint.address == self.ip_n \
                   and ep.endpoint.sw_if_index == self.itf.sw_if_index:
                    return True
            else:
                if ep.endpoint.address[:4] == self.ip_n \
                   and ep.endpoint.sw_if_index == self.itf.sw_if_index:
                    return True
        return False


class VppGbpRecirc(VppObject):
    """
    GDB Recirculation Interface
    """

    def __init__(self, test, epg, recirc, is_ext=False):
        self._test = test
        self.recirc = recirc
        self.epg = epg
        self.is_ext = is_ext

    def add_vpp_config(self):
        self._test.vapi.gbp_recirc_add_del(
            1,
            self.recirc.sw_if_index,
            self.epg.epg,
            self.is_ext)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.gbp_recirc_add_del(
            0,
            self.recirc.sw_if_index,
            self.epg.epg,
            self.is_ext)

    def __str__(self):
        return self.object_id()

    def object_id(self):
        return "gbp-recirc;[%d]" % (self.recirc.sw_if_index)

    def query_vpp_config(self):
        rs = self._test.vapi.gbp_recirc_dump()
        for r in rs:
            if r.recirc.sw_if_index == self.recirc.sw_if_index:
                return True
        return False


class VppGbpSubnet(VppObject):
    """
    GDB Subnet
    """

    def __init__(self, test, table_id, address, address_len,
                 is_internal=True, is_ip6=False,
                 sw_if_index=None, epg=None):
        self._test = test
        self.table_id = table_id
        self.address = address
        self.address_len = address_len
        self.is_ip6 = is_ip6
        if is_ip6:
            self.address_n = inet_pton(AF_INET6, address)
        else:
            self.address_n = inet_pton(AF_INET, address)
        self.is_internal = is_internal
        self.sw_if_index = sw_if_index
        self.epg = epg

    def add_vpp_config(self):
        self._test.vapi.gbp_subnet_add_del(
            1,
            self.table_id,
            self.is_internal,
            self.address_n,
            self.address_len,
            sw_if_index=self.sw_if_index if self.sw_if_index else 0xffffffff,
            epg_id=self.epg if self.epg else 0xffffffff,
            is_ip6=self.is_ip6)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.gbp_subnet_add_del(
            0,
            self.table_id,
            self.is_internal,
            self.address_n,
            self.address_len,
            is_ip6=self.is_ip6)

    def __str__(self):
        return self.object_id()

    def object_id(self):
        return "gbp-subnet;[%d:%s/%d]" % (self.table_id,
                                          self.address,
                                          self.address_len)

    def query_vpp_config(self):
        ss = self._test.vapi.gbp_subnet_dump()
        for s in ss:
            if s.subnet.table_id == self.table_id and \
               s.subnet.address_length == self.address_len and \
               s.subnet.is_ip6 == self.is_ip6:
                if self.is_ip6:
                    if s.subnet.address == self.address_n:
                        return True
                else:
                    if s.subnet.address[:4] == self.address_n:
                        return True
        return False


class VppGbpEndpointGroup(VppObject):
    """
    GDB Endpoint Group
    """

    def __init__(self, test, epg, rd, bd, uplink,
                 bvi, bvi_ip4, bvi_ip6=None):
        self._test = test
        self.uplink = uplink
        self.bvi = bvi
        self.bvi_ip4 = bvi_ip4
        self.bvi_ip4_n = inet_pton(AF_INET, bvi_ip4)
        self.bvi_ip6 = bvi_ip6
        self.bvi_ip6_n = inet_pton(AF_INET6, bvi_ip6)
        self.epg = epg
        self.bd = bd
        self.rd = rd

    def add_vpp_config(self):
        self._test.vapi.gbp_endpoint_group_add_del(
            1,
            self.epg,
            self.bd,
            self.rd,
            self.rd,
            self.uplink.sw_if_index)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.gbp_endpoint_group_add_del(
            0,
            self.epg,
            self.bd,
            self.rd,
            self.rd,
            self.uplink.sw_if_index)

    def __str__(self):
        return self.object_id()

    def object_id(self):
        return "gbp-endpoint-group;[%d]" % (self.epg)

    def query_vpp_config(self):
        epgs = self._test.vapi.gbp_endpoint_group_dump()
        for epg in epgs:
            if epg.epg.epg_id == self.epg:
                return True
        return False


class VppGbpContract(VppObject):
    """
    GDB Contract
    """

    def __init__(self, test, src_epg, dst_epg, acl_index):
        self._test = test
        self.acl_index = acl_index
        self.src_epg = src_epg
        self.dst_epg = dst_epg

    def add_vpp_config(self):
        self._test.vapi.gbp_contract_add_del(
            1,
            self.src_epg,
            self.dst_epg,
            self.acl_index)
        self._test.registry.register(self, self._test.logger)

    def remove_vpp_config(self):
        self._test.vapi.gbp_contract_add_del(
            0,
            self.src_epg,
            self.dst_epg,
            self.acl_index)

    def __str__(self):
        return self.object_id()

    def object_id(self):
        return "gbp-contract;[%d:%s:%d]" % (self.src_epg,
                                            self.dst_epg,
                                            self.acl_index)

    def query_vpp_config(self):
        cs = self._test.vapi.gbp_contract_dump()
        for c in cs:
            if c.contract.src_epg == self.src_epg \
               and c.contract.dst_epg == self.dst_epg:
                return True
        return False


class TestGBP(VppTestCase):
    """ GBP Test Case """

    def setUp(self):
        super(TestGBP, self).setUp()

        self.create_pg_interfaces(range(9))
        self.create_loopback_interfaces(range(9))

        self.router_mac = "00:11:22:33:44:55"

        for i in self.pg_interfaces:
            i.admin_up()
        for i in self.lo_interfaces:
            i.admin_up()
            self.vapi.sw_interface_set_mac_address(
                i.sw_if_index,
                mactobinary(self.router_mac))

    def tearDown(self):
        for i in self.pg_interfaces:
            i.admin_down()

        super(TestGBP, self).tearDown()

    def send_and_expect_bridged(self, src, tx, dst):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IP].src, tx[0][IP].src)
            self.assertEqual(r[IP].dst, tx[0][IP].dst)
        return rx

    def send_and_expect_bridged6(self, src, tx, dst):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IPv6].src, tx[0][IPv6].src)
            self.assertEqual(r[IPv6].dst, tx[0][IPv6].dst)
        return rx

    def send_and_expect_routed(self, src, tx, dst, src_mac):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, src_mac)
            self.assertEqual(r[Ether].dst, dst.remote_mac)
            self.assertEqual(r[IP].src, tx[0][IP].src)
            self.assertEqual(r[IP].dst, tx[0][IP].dst)
        return rx

    def send_and_expect_natted(self, src, tx, dst, src_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IP].src, src_ip)
            self.assertEqual(r[IP].dst, tx[0][IP].dst)
        return rx

    def send_and_expect_natted6(self, src, tx, dst, src_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IPv6].src, src_ip)
            self.assertEqual(r[IPv6].dst, tx[0][IPv6].dst)
        return rx

    def send_and_expect_unnatted(self, src, tx, dst, dst_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IP].dst, dst_ip)
            self.assertEqual(r[IP].src, tx[0][IP].src)
        return rx

    def send_and_expect_unnatted6(self, src, tx, dst, dst_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, tx[0][Ether].src)
            self.assertEqual(r[Ether].dst, tx[0][Ether].dst)
            self.assertEqual(r[IPv6].dst, dst_ip)
            self.assertEqual(r[IPv6].src, tx[0][IPv6].src)
        return rx

    def send_and_expect_double_natted(self, src, tx, dst, src_ip, dst_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, self.router_mac)
            self.assertEqual(r[Ether].dst, dst.remote_mac)
            self.assertEqual(r[IP].dst, dst_ip)
            self.assertEqual(r[IP].src, src_ip)
        return rx

    def send_and_expect_double_natted6(self, src, tx, dst, src_ip, dst_ip):
        rx = self.send_and_expect(src, tx, dst)

        for r in rx:
            self.assertEqual(r[Ether].src, self.router_mac)
            self.assertEqual(r[Ether].dst, dst.remote_mac)
            self.assertEqual(r[IPv6].dst, dst_ip)
            self.assertEqual(r[IPv6].src, src_ip)
        return rx

    def test_gbp(self):
        """ Group Based Policy """

        nat_table = VppIpTable(self, 20)
        nat_table.add_vpp_config()

        #
        # Bridge Domains
        #
        self.vapi.bridge_domain_add_del(1, flood=1, uu_flood=1, forward=1,
                                        learn=0, arp_term=1, is_add=1)
        self.vapi.bridge_domain_add_del(2, flood=1, uu_flood=1, forward=1,
                                        learn=0, arp_term=1, is_add=1)
        self.vapi.bridge_domain_add_del(20, flood=1, uu_flood=1, forward=1,
                                        learn=0, arp_term=1, is_add=1)

        #
        # 3 EPGs, 2 of which share a BD.
        #
        epgs = []
        recircs = []
        epgs.append(VppGbpEndpointGroup(self, 220, 0, 1, self.pg4,
                                        self.loop0,
                                        "10.0.0.128",
                                        "2001:10::128"))
        recircs.append(VppGbpRecirc(self, epgs[0],
                                    self.loop3))
        epgs.append(VppGbpEndpointGroup(self, 221, 0, 1, self.pg5,
                                        self.loop0,
                                        "10.0.1.128",
                                        "2001:10:1::128"))
        recircs.append(VppGbpRecirc(self, epgs[1],
                                    self.loop4))
        epgs.append(VppGbpEndpointGroup(self, 222, 0, 2, self.pg6,
                                        self.loop1,
                                        "10.0.2.128",
                                        "2001:10:2::128"))
        recircs.append(VppGbpRecirc(self, epgs[2],
                                    self.loop5))

        #
        # 2 NAT EPGs, one for floating-IP subnets, the other for internet
        #
        epgs.append(VppGbpEndpointGroup(self, 333, 20, 20, self.pg7,
                                        self.loop2,
                                        "11.0.0.128",
                                        "3001::128"))
        recircs.append(VppGbpRecirc(self, epgs[3],
                                    self.loop6, is_ext=True))
        epgs.append(VppGbpEndpointGroup(self, 444, 20, 20, self.pg8,
                                        self.loop2,
                                        "11.0.0.129",
                                        "3001::129"))
        recircs.append(VppGbpRecirc(self, epgs[4],
                                    self.loop8, is_ext=True))

        epg_nat = epgs[3]
        recirc_nat = recircs[3]

        #
        # 4 end-points, 2 in the same subnet, 3 in the same BD
        #
        eps = []
        eps.append(VppGbpEndpoint(self, self.pg0,
                                  epgs[0], recircs[0],
                                  "10.0.0.1",
                                  "11.0.0.1"))
        eps.append(VppGbpEndpoint(self, self.pg1,
                                  epgs[0], recircs[0],
                                  "10.0.0.2",
                                  "11.0.0.2"))
        eps.append(VppGbpEndpoint(self, self.pg2,
                                  epgs[1], recircs[1],
                                  "10.0.1.1",
                                  "11.0.0.3"))
        eps.append(VppGbpEndpoint(self, self.pg3,
                                  epgs[2], recircs[2],
                                  "10.0.2.1",
                                  "11.0.0.4"))
        eps.append(VppGbpEndpoint(self, self.pg0,
                                  epgs[0], recircs[0],
                                  "2001:10::1",
                                  "3001::1",
                                  is_ip6=True))
        eps.append(VppGbpEndpoint(self, self.pg1,
                                  epgs[0], recircs[0],
                                  "2001:10::2",
                                  "3001::2",
                                  is_ip6=True))
        eps.append(VppGbpEndpoint(self, self.pg2,
                                  epgs[1], recircs[1],
                                  "2001:10:1::1",
                                  "3001::3",
                                  is_ip6=True))
        eps.append(VppGbpEndpoint(self, self.pg3,
                                  epgs[2], recircs[2],
                                  "2001:10:2::1",
                                  "3001::4",
                                  is_ip6=True))

        #
        # Config related to each of the EPGs
        #
        for epg in epgs:
            # IP config on the BVI interfaces
            if epg != epgs[1] and epg != epgs[4]:
                epg.bvi.set_table_ip4(epg.rd)
                epg.bvi.set_table_ip6(epg.rd)

                # The BVIs are NAT inside interfaces
                self.vapi.nat44_interface_add_del_feature(epg.bvi.sw_if_index,
                                                          is_inside=1,
                                                          is_add=1)
                self.vapi.nat66_add_del_interface(epg.bvi.sw_if_index,
                                                  is_inside=1,
                                                  is_add=1)

            self.vapi.sw_interface_add_del_address(epg.bvi.sw_if_index,
                                                   epg.bvi_ip4_n,
                                                   32)
            self.vapi.sw_interface_add_del_address(epg.bvi.sw_if_index,
                                                   epg.bvi_ip6_n,
                                                   128,
                                                   is_ipv6=True)

            # EPG uplink interfaces in the BD
            epg.uplink.set_table_ip4(epg.rd)
            epg.uplink.set_table_ip6(epg.rd)
            self.vapi.sw_interface_set_l2_bridge(epg.uplink.sw_if_index,
                                                 epg.bd)

            # add the BD ARP termination entry for BVI IP
            self.vapi.bd_ip_mac_add_del(bd_id=epg.bd,
                                        mac=mactobinary(self.router_mac),
                                        ip=epg.bvi_ip4_n,
                                        is_ipv6=0,
                                        is_add=1)
            self.vapi.bd_ip_mac_add_del(bd_id=epg.bd,
                                        mac=mactobinary(self.router_mac),
                                        ip=epg.bvi_ip6_n,
                                        is_ipv6=1,
                                        is_add=1)

            # epg[1] shares the same BVI to epg[0]
            if epg != epgs[1] and epg != epgs[4]:
                # BVI in BD
                self.vapi.sw_interface_set_l2_bridge(epg.bvi.sw_if_index,
                                                     epg.bd,
                                                     bvi=1)
                # BVI L2 FIB entry
                self.vapi.l2fib_add_del(self.router_mac,
                                        epg.bd,
                                        epg.bvi.sw_if_index,
                                        is_add=1, bvi_mac=1)

            # EPG in VPP
            epg.add_vpp_config()

        for recirc in recircs:
            # EPG's ingress recirculation interface maps to its RD
            recirc.recirc.set_table_ip4(recirc.epg.rd)
            recirc.recirc.set_table_ip6(recirc.epg.rd)

            # in the bridge to allow DVR. L2 emulation to punt to L3
            self.vapi.sw_interface_set_l2_bridge(recirc.recirc.sw_if_index,
                                                 recirc.epg.bd)
            self.vapi.sw_interface_set_l2_emulation(
                recirc.recirc.sw_if_index)

            self.vapi.nat44_interface_add_del_feature(
                recirc.recirc.sw_if_index,
                is_inside=0,
                is_add=1)
            self.vapi.nat66_add_del_interface(
                recirc.recirc.sw_if_index,
                is_inside=0,
                is_add=1)

            recirc.add_vpp_config()

        ep_routes = []
        ep_arps = []
        for ep in eps:
            self.pg_enable_capture(self.pg_interfaces)
            self.pg_start()
            #
            # routes to the endpoints. We need these since there are no
            # adj-fibs due to the fact the the BVI address has /32 and
            # the subnet is not attached.
            #
            r = VppIpRoute(self, ep.ip, ep.ip_len,
                           [VppRoutePath(ep.ip,
                                         ep.epg.bvi.sw_if_index,
                                         proto=ep.proto)],
                           is_ip6=ep.is_ip6)
            r.add_vpp_config()
            ep_routes.append(r)

            #
            # ARP entries for the endpoints
            #
            a = VppNeighbor(self,
                            ep.epg.bvi.sw_if_index,
                            ep.itf.remote_mac,
                            ep.ip, af=ep.af)
            a.add_vpp_config()
            ep_arps.append(a)

            # add each EP itf to the its BD
            self.vapi.sw_interface_set_l2_bridge(ep.itf.sw_if_index,
                                                 ep.epg.bd)

            # add the BD ARP termination entry
            self.vapi.bd_ip_mac_add_del(bd_id=ep.epg.bd,
                                        mac=ep.bin_mac,
                                        ip=ep.ip_n,
                                        is_ipv6=0,
                                        is_add=1)

            # L2 FIB entry
            self.vapi.l2fib_add_del(ep.mac,
                                    ep.epg.bd,
                                    ep.itf.sw_if_index,
                                    is_add=1)

            # Add static mappings for each EP from the 10/8 to 11/8 network
            if ep.af == AF_INET:
                self.vapi.nat44_add_del_static_mapping(ep.ip_n,
                                                       ep.floating_ip_n,
                                                       vrf_id=0,
                                                       addr_only=1)
            else:
                self.vapi.nat66_add_del_static_mapping(ep.ip_n,
                                                       ep.floating_ip_n,
                                                       vrf_id=0)

            # VPP EP create ...
            ep.add_vpp_config()

            # ... results in a Gratuitous ARP/ND on the EPG's uplink
            rx = ep.epg.uplink.get_capture(1, timeout=0.2)

            if ep.is_ip6:
                self.assertTrue(rx[0].haslayer(ICMPv6ND_NA))
                self.assertEqual(rx[0][ICMPv6ND_NA].tgt, ep.ip)
            else:
                self.assertTrue(rx[0].haslayer(ARP))
                self.assertEqual(rx[0][ARP].psrc, ep.ip)
                self.assertEqual(rx[0][ARP].pdst, ep.ip)

            # add the BD ARP termination entry for floating IP
            self.vapi.bd_ip_mac_add_del(bd_id=epg_nat.bd,
                                        mac=ep.bin_mac,
                                        ip=ep.floating_ip_n,
                                        is_ipv6=ep.is_ip6,
                                        is_add=1)

            # floating IPs route via EPG recirc
            r = VppIpRoute(self, ep.floating_ip, ep.ip_len,
                           [VppRoutePath(ep.floating_ip,
                                         ep.recirc.recirc.sw_if_index,
                                         is_dvr=1,
                                         proto=ep.proto)],
                           table_id=20,
                           is_ip6=ep.is_ip6)
            r.add_vpp_config()
            ep_routes.append(r)

            # L2 FIB entries in the NAT EPG BD to bridge the packets from
            # the outside direct to the internal EPG
            self.vapi.l2fib_add_del(ep.mac,
                                    epg_nat.bd,
                                    ep.recirc.recirc.sw_if_index,
                                    is_add=1)

        #
        # ARP packets for unknown IP are flooded
        #
        pkt_arp = (Ether(dst="ff:ff:ff:ff:ff:ff",
                         src=self.pg0.remote_mac) /
                   ARP(op="who-has",
                       hwdst="ff:ff:ff:ff:ff:ff",
                       hwsrc=self.pg0.remote_mac,
                       pdst=epgs[0].bvi_ip4,
                       psrc="10.0.0.88"))

        self.send_and_expect(self.pg0, [pkt_arp], self.pg0)

        #
        # ARP/ND packets get a response
        #
        pkt_arp = (Ether(dst="ff:ff:ff:ff:ff:ff",
                         src=self.pg0.remote_mac) /
                   ARP(op="who-has",
                       hwdst="ff:ff:ff:ff:ff:ff",
                       hwsrc=self.pg0.remote_mac,
                       pdst=epgs[0].bvi_ip4,
                       psrc=eps[0].ip))

        self.send_and_expect(self.pg0, [pkt_arp], self.pg0)

        nsma = in6_getnsma(inet_pton(AF_INET6, eps[4].ip))
        d = inet_ntop(AF_INET6, nsma)
        pkt_nd = (Ether(dst=in6_getnsmac(nsma)) /
                  IPv6(dst=d, src=eps[4].ip) /
                  ICMPv6ND_NS(tgt=epgs[0].bvi_ip6) /
                  ICMPv6NDOptSrcLLAddr(lladdr=self.pg0.remote_mac))
        self.send_and_expect(self.pg0, [pkt_nd], self.pg0)

        #
        # broadcast packets are flooded
        #
        pkt_bcast = (Ether(dst="ff:ff:ff:ff:ff:ff",
                           src=self.pg0.remote_mac) /
                     IP(src=eps[0].ip, dst="232.1.1.1") /
                     UDP(sport=1234, dport=1234) /
                     Raw('\xa5' * 100))

        self.vapi.cli("clear trace")
        self.pg0.add_stream(pkt_bcast)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rxd = eps[1].itf.get_capture(1)
        self.assertEqual(rxd[0][Ether].dst, pkt_bcast[Ether].dst)
        rxd = epgs[0].uplink.get_capture(1)
        self.assertEqual(rxd[0][Ether].dst, pkt_bcast[Ether].dst)

        #
        # packets to non-local L3 destinations dropped
        #
        pkt_intra_epg_220_ip4 = (Ether(src=self.pg0.remote_mac,
                                       dst=self.router_mac) /
                                 IP(src=eps[0].ip, dst="10.0.0.99") /
                                 UDP(sport=1234, dport=1234) /
                                 Raw('\xa5' * 100))
        pkt_inter_epg_222_ip4 = (Ether(src=self.pg0.remote_mac,
                                       dst=self.router_mac) /
                                 IP(src=eps[0].ip, dst="10.0.1.99") /
                                 UDP(sport=1234, dport=1234) /
                                 Raw('\xa5' * 100))

        self.send_and_assert_no_replies(self.pg0, pkt_intra_epg_220_ip4 * 65)

        pkt_inter_epg_222_ip6 = (Ether(src=self.pg0.remote_mac,
                                       dst=self.router_mac) /
                                 IPv6(src=eps[4].ip, dst="2001:10::99") /
                                 UDP(sport=1234, dport=1234) /
                                 Raw('\xa5' * 100))
        self.send_and_assert_no_replies(self.pg0, pkt_inter_epg_222_ip6 * 65)

        #
        # Add the subnet routes
        #
        s41 = VppGbpSubnet(self, 0, "10.0.0.0", 24)
        s42 = VppGbpSubnet(self, 0, "10.0.1.0", 24)
        s43 = VppGbpSubnet(self, 0, "10.0.2.0", 24)
        s41.add_vpp_config()
        s42.add_vpp_config()
        s43.add_vpp_config()
        s61 = VppGbpSubnet(self, 0, "2001:10::1", 64, is_ip6=True)
        s62 = VppGbpSubnet(self, 0, "2001:10:1::1", 64, is_ip6=True)
        s63 = VppGbpSubnet(self, 0, "2001:10:2::1", 64, is_ip6=True)
        s61.add_vpp_config()
        s62.add_vpp_config()
        s63.add_vpp_config()

        self.send_and_expect_bridged(self.pg0,
                                     pkt_intra_epg_220_ip4 * 65,
                                     self.pg4)
        self.send_and_expect_bridged(self.pg3,
                                     pkt_inter_epg_222_ip4 * 65,
                                     self.pg6)
        self.send_and_expect_bridged6(self.pg3,
                                      pkt_inter_epg_222_ip6 * 65,
                                      self.pg6)

        self.logger.info(self.vapi.cli("sh ip fib 11.0.0.2"))
        self.logger.info(self.vapi.cli("sh gbp endpoint-group"))
        self.logger.info(self.vapi.cli("sh gbp endpoint"))
        self.logger.info(self.vapi.cli("sh gbp recirc"))
        self.logger.info(self.vapi.cli("sh int"))
        self.logger.info(self.vapi.cli("sh int addr"))
        self.logger.info(self.vapi.cli("sh int feat loop6"))
        self.logger.info(self.vapi.cli("sh vlib graph ip4-gbp-src-classify"))
        self.logger.info(self.vapi.cli("sh int feat loop3"))

        #
        # Packet destined to unknown unicast is sent on the epg uplink ...
        #
        pkt_intra_epg_220_to_uplink = (Ether(src=self.pg0.remote_mac,
                                             dst="00:00:00:33:44:55") /
                                       IP(src=eps[0].ip, dst="10.0.0.99") /
                                       UDP(sport=1234, dport=1234) /
                                       Raw('\xa5' * 100))

        self.send_and_expect_bridged(self.pg0,
                                     pkt_intra_epg_220_to_uplink * 65,
                                     self.pg4)
        # ... and nowhere else
        self.pg1.get_capture(0, timeout=0.1)
        self.pg1.assert_nothing_captured(remark="Flood onto other VMS")

        pkt_intra_epg_221_to_uplink = (Ether(src=self.pg2.remote_mac,
                                             dst="00:00:00:33:44:66") /
                                       IP(src=eps[0].ip, dst="10.0.0.99") /
                                       UDP(sport=1234, dport=1234) /
                                       Raw('\xa5' * 100))

        self.send_and_expect_bridged(self.pg2,
                                     pkt_intra_epg_221_to_uplink * 65,
                                     self.pg5)

        #
        # Packets from the uplink are forwarded in the absence of a contract
        #
        pkt_intra_epg_220_from_uplink = (Ether(src="00:00:00:33:44:55",
                                               dst=self.pg0.remote_mac) /
                                         IP(src=eps[0].ip, dst="10.0.0.99") /
                                         UDP(sport=1234, dport=1234) /
                                         Raw('\xa5' * 100))

        self.send_and_expect_bridged(self.pg4,
                                     pkt_intra_epg_220_from_uplink * 65,
                                     self.pg0)

        #
        # in the absence of policy, endpoints in the same EPG
        # can communicate
        #
        pkt_intra_epg = (Ether(src=self.pg0.remote_mac,
                               dst=self.pg1.remote_mac) /
                         IP(src=eps[0].ip, dst=eps[1].ip) /
                         UDP(sport=1234, dport=1234) /
                         Raw('\xa5' * 100))

        self.send_and_expect_bridged(self.pg0, pkt_intra_epg * 65, self.pg1)

        #
        # in the abscense of policy, endpoints in the different EPG
        # cannot communicate
        #
        pkt_inter_epg_220_to_221 = (Ether(src=self.pg0.remote_mac,
                                          dst=self.pg2.remote_mac) /
                                    IP(src=eps[0].ip, dst=eps[2].ip) /
                                    UDP(sport=1234, dport=1234) /
                                    Raw('\xa5' * 100))
        pkt_inter_epg_221_to_220 = (Ether(src=self.pg2.remote_mac,
                                          dst=self.pg0.remote_mac) /
                                    IP(src=eps[2].ip, dst=eps[0].ip) /
                                    UDP(sport=1234, dport=1234) /
                                    Raw('\xa5' * 100))
        pkt_inter_epg_220_to_222 = (Ether(src=self.pg0.remote_mac,
                                          dst=self.router_mac) /
                                    IP(src=eps[0].ip, dst=eps[3].ip) /
                                    UDP(sport=1234, dport=1234) /
                                    Raw('\xa5' * 100))

        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_221 * 65)
        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_222 * 65)

        #
        # A uni-directional contract from EPG 220 -> 221
        #
        c1 = VppGbpContract(self, 220, 221, 0)
        c1.add_vpp_config()

        self.send_and_expect_bridged(self.pg0,
                                     pkt_inter_epg_220_to_221 * 65,
                                     self.pg2)
        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_222 * 65)

        #
        # contract for the return direction
        #
        c2 = VppGbpContract(self, 221, 220, 0)
        c2.add_vpp_config()

        self.send_and_expect_bridged(self.pg0,
                                     pkt_inter_epg_220_to_221 * 65,
                                     self.pg2)
        self.send_and_expect_bridged(self.pg2,
                                     pkt_inter_epg_221_to_220 * 65,
                                     self.pg0)

        #
        # check that inter group is still disabled for the groups
        # not in the contract.
        #
        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_222 * 65)

        #
        # A uni-directional contract from EPG 220 -> 222 'L3 routed'
        #
        c3 = VppGbpContract(self, 220, 222, 0)
        c3.add_vpp_config()

        self.logger.info(self.vapi.cli("sh gbp contract"))

        self.send_and_expect_routed(self.pg0,
                                    pkt_inter_epg_220_to_222 * 65,
                                    self.pg3,
                                    self.router_mac)

        #
        # remove both contracts, traffic stops in both directions
        #
        c2.remove_vpp_config()
        c1.remove_vpp_config()
        c3.remove_vpp_config()

        self.send_and_assert_no_replies(self.pg2,
                                        pkt_inter_epg_221_to_220 * 65)
        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_221 * 65)
        self.send_and_expect_bridged(self.pg0, pkt_intra_epg * 65, self.pg1)

        #
        # EPs to the outside world
        #

        # in the EP's RD an external subnet via the NAT EPG's recirc
        se1 = VppGbpSubnet(self, 0, "0.0.0.0", 0,
                           is_internal=False,
                           sw_if_index=recirc_nat.recirc.sw_if_index,
                           epg=epg_nat.epg)
        se1.add_vpp_config()
        se2 = VppGbpSubnet(self, 0, "11.0.0.0", 8,
                           is_internal=False,
                           sw_if_index=recirc_nat.recirc.sw_if_index,
                           epg=epg_nat.epg)
        se2.add_vpp_config()
        se16 = VppGbpSubnet(self, 0, "::", 0,
                            is_internal=False,
                            sw_if_index=recirc_nat.recirc.sw_if_index,
                            epg=epg_nat.epg,
                            is_ip6=True)
        se16.add_vpp_config()
        # in the NAT RD an external subnet via the NAT EPG's uplink
        se3 = VppGbpSubnet(self, 20, "0.0.0.0", 0,
                           is_internal=False,
                           sw_if_index=epg_nat.uplink.sw_if_index,
                           epg=epg_nat.epg)
        se36 = VppGbpSubnet(self, 20, "::", 0,
                            is_internal=False,
                            sw_if_index=epg_nat.uplink.sw_if_index,
                            epg=epg_nat.epg,
                            is_ip6=True)
        se4 = VppGbpSubnet(self, 20, "11.0.0.0", 8,
                           is_internal=False,
                           sw_if_index=epg_nat.uplink.sw_if_index,
                           epg=epg_nat.epg)
        se3.add_vpp_config()
        se36.add_vpp_config()
        se4.add_vpp_config()

        self.logger.info(self.vapi.cli("sh ip fib 0.0.0.0/0"))
        self.logger.info(self.vapi.cli("sh ip fib 11.0.0.1"))
        self.logger.info(self.vapi.cli("sh ip6 fib ::/0"))
        self.logger.info(self.vapi.cli("sh ip6 fib %s" %
                                       eps[4].floating_ip))

        #
        # From an EP to an outside addess: IN2OUT
        #
        pkt_inter_epg_220_to_global = (Ether(src=self.pg0.remote_mac,
                                             dst=self.router_mac) /
                                       IP(src=eps[0].ip, dst="1.1.1.1") /
                                       UDP(sport=1234, dport=1234) /
                                       Raw('\xa5' * 100))

        # no policy yet
        self.send_and_assert_no_replies(self.pg0,
                                        pkt_inter_epg_220_to_global * 65)

        c4 = VppGbpContract(self, 220, 333, 0)
        c4.add_vpp_config()

        self.send_and_expect_natted(self.pg0,
                                    pkt_inter_epg_220_to_global * 65,
                                    self.pg7,
                                    eps[0].floating_ip)

        pkt_inter_epg_220_to_global = (Ether(src=self.pg0.remote_mac,
                                             dst=self.router_mac) /
                                       IPv6(src=eps[4].ip, dst="6001::1") /
                                       UDP(sport=1234, dport=1234) /
                                       Raw('\xa5' * 100))

        self.send_and_expect_natted6(self.pg0,
                                     pkt_inter_epg_220_to_global * 65,
                                     self.pg7,
                                     eps[4].floating_ip)

        #
        # From a global address to an EP: OUT2IN
        #
        pkt_inter_epg_220_from_global = (Ether(src=self.router_mac,
                                               dst=self.pg0.remote_mac) /
                                         IP(dst=eps[0].floating_ip,
                                            src="1.1.1.1") /
                                         UDP(sport=1234, dport=1234) /
                                         Raw('\xa5' * 100))

        self.send_and_assert_no_replies(self.pg7,
                                        pkt_inter_epg_220_from_global * 65)

        c5 = VppGbpContract(self, 333, 220, 0)
        c5.add_vpp_config()

        self.send_and_expect_unnatted(self.pg7,
                                      pkt_inter_epg_220_from_global * 65,
                                      eps[0].itf,
                                      eps[0].ip)

        pkt_inter_epg_220_from_global = (Ether(src=self.router_mac,
                                               dst=self.pg0.remote_mac) /
                                         IPv6(dst=eps[4].floating_ip,
                                              src="6001::1") /
                                         UDP(sport=1234, dport=1234) /
                                         Raw('\xa5' * 100))

        self.send_and_expect_unnatted6(self.pg7,
                                       pkt_inter_epg_220_from_global * 65,
                                       eps[4].itf,
                                       eps[4].ip)

        #
        # From a local VM to another local VM using resp. public addresses:
        #  IN2OUT2IN
        #
        pkt_intra_epg_220_global = (Ether(src=self.pg0.remote_mac,
                                          dst=self.router_mac) /
                                    IP(src=eps[0].ip,
                                       dst=eps[1].floating_ip) /
                                    UDP(sport=1234, dport=1234) /
                                    Raw('\xa5' * 100))

        self.send_and_expect_double_natted(eps[0].itf,
                                           pkt_intra_epg_220_global * 65,
                                           eps[1].itf,
                                           eps[0].floating_ip,
                                           eps[1].ip)

        pkt_intra_epg_220_global = (Ether(src=self.pg4.remote_mac,
                                          dst=self.router_mac) /
                                    IPv6(src=eps[4].ip,
                                         dst=eps[5].floating_ip) /
                                    UDP(sport=1234, dport=1234) /
                                    Raw('\xa5' * 100))

        self.send_and_expect_double_natted6(eps[4].itf,
                                            pkt_intra_epg_220_global * 65,
                                            eps[5].itf,
                                            eps[4].floating_ip,
                                            eps[5].ip)

        #
        # cleanup
        #
        for ep in eps:
            # del static mappings for each EP from the 10/8 to 11/8 network
            if ep.af == AF_INET:
                self.vapi.nat44_add_del_static_mapping(ep.ip_n,
                                                       ep.floating_ip_n,
                                                       vrf_id=0,
                                                       addr_only=1,
                                                       is_add=0)
            else:
                self.vapi.nat66_add_del_static_mapping(ep.ip_n,
                                                       ep.floating_ip_n,
                                                       vrf_id=0,
                                                       is_add=0)

        for epg in epgs:
            # IP config on the BVI interfaces
            self.vapi.sw_interface_add_del_address(epg.bvi.sw_if_index,
                                                   epg.bvi_ip4_n,
                                                   32,
                                                   is_add=0)
            self.vapi.sw_interface_add_del_address(epg.bvi.sw_if_index,
                                                   epg.bvi_ip6_n,
                                                   128,
                                                   is_add=0,
                                                   is_ipv6=True)
            self.logger.info(self.vapi.cli("sh int addr"))

            epg.uplink.set_table_ip4(0)
            epg.uplink.set_table_ip6(0)

            if epg != epgs[0] and epg != epgs[3]:
                epg.bvi.set_table_ip4(0)
                epg.bvi.set_table_ip6(0)

                self.vapi.nat44_interface_add_del_feature(epg.bvi.sw_if_index,
                                                          is_inside=1,
                                                          is_add=0)
                self.vapi.nat66_add_del_interface(epg.bvi.sw_if_index,
                                                  is_inside=1,
                                                  is_add=0)

        for recirc in recircs:
            recirc.recirc.set_table_ip4(0)
            recirc.recirc.set_table_ip6(0)

            self.vapi.nat44_interface_add_del_feature(
                recirc.recirc.sw_if_index,
                is_inside=0,
                is_add=0)
            self.vapi.nat66_add_del_interface(
                recirc.recirc.sw_if_index,
                is_inside=0,
                is_add=0)


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)