test/test_dvr.py

#!/usr/bin/env python3
import unittest

from framework import VppTestCase
from asfframework import VppTestRunner
from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathType
from vpp_l2 import L2_PORT_TYPE
from vpp_sub_interface import L2_VTR_OP, VppDot1QSubint
from vpp_acl import AclRule, VppAcl, VppAclInterface

from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q
from scapy.layers.inet import IP, UDP
from socket import AF_INET
from ipaddress import IPv4Network

NUM_PKTS = 67


class TestDVR(VppTestCase):
    """Distributed Virtual Router"""

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

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

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

        self.create_pg_interfaces(range(4))
        self.create_loopback_interfaces(1)

        for i in self.pg_interfaces:
            i.admin_up()

        self.loop0.config_ip4()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.admin_down()
        self.loop0.unconfig_ip4()

        super(TestDVR, self).tearDown()

    def assert_same_mac_addr(self, tx, rx):
        t_eth = tx[Ether]
        for p in rx:
            r_eth = p[Ether]
            self.assertEqual(t_eth.src, r_eth.src)
            self.assertEqual(t_eth.dst, r_eth.dst)

    def assert_has_vlan_tag(self, tag, rx):
        for p in rx:
            r_1q = p[Dot1Q]
            self.assertEqual(tag, r_1q.vlan)

    def assert_has_no_tag(self, rx):
        for p in rx:
            self.assertFalse(p.haslayer(Dot1Q))

    def test_dvr(self):
        """Distributed Virtual Router"""

        #
        # A packet destined to an IP address that is L2 bridged via
        # a non-tag interface
        #
        ip_non_tag_bridged = "10.10.10.10"
        ip_tag_bridged = "10.10.10.11"
        any_src_addr = "1.1.1.1"

        pkt_no_tag = (
            Ether(src=self.pg0.remote_mac, dst=self.loop0.local_mac)
            / IP(src=any_src_addr, dst=ip_non_tag_bridged)
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )
        pkt_tag = (
            Ether(src=self.pg0.remote_mac, dst=self.loop0.local_mac)
            / IP(src=any_src_addr, dst=ip_tag_bridged)
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )

        #
        # Two sub-interfaces so we can test VLAN tag push/pop
        #
        sub_if_on_pg2 = VppDot1QSubint(self, self.pg2, 92)
        sub_if_on_pg3 = VppDot1QSubint(self, self.pg3, 93)
        sub_if_on_pg2.admin_up()
        sub_if_on_pg3.admin_up()

        #
        # Put all the interfaces into a new bridge domain
        #
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.pg0.sw_if_index, bd_id=1
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.pg1.sw_if_index, bd_id=1
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.loop0.sw_if_index, bd_id=1, port_type=L2_PORT_TYPE.BVI
        )

        self.vapi.l2_interface_vlan_tag_rewrite(
            sw_if_index=sub_if_on_pg2.sw_if_index,
            vtr_op=L2_VTR_OP.L2_POP_1,
            push_dot1q=92,
        )
        self.vapi.l2_interface_vlan_tag_rewrite(
            sw_if_index=sub_if_on_pg3.sw_if_index,
            vtr_op=L2_VTR_OP.L2_POP_1,
            push_dot1q=93,
        )

        #
        # Add routes to bridge the traffic via a tagged an nontagged interface
        #
        route_no_tag = VppIpRoute(
            self,
            ip_non_tag_bridged,
            32,
            [
                VppRoutePath(
                    "0.0.0.0", self.pg1.sw_if_index, type=FibPathType.FIB_PATH_TYPE_DVR
                )
            ],
        )
        route_no_tag.add_vpp_config()

        #
        # Inject the packet that arrives and leaves on a non-tagged interface
        # Since it's 'bridged' expect that the MAC headed is unchanged.
        #
        rx = self.send_and_expect(self.pg0, pkt_no_tag * NUM_PKTS, self.pg1)
        self.assert_same_mac_addr(pkt_no_tag, rx)
        self.assert_has_no_tag(rx)

        #
        # Add routes to bridge the traffic via a tagged interface
        #
        route_with_tag = VppIpRoute(
            self,
            ip_tag_bridged,
            32,
            [
                VppRoutePath(
                    "0.0.0.0",
                    sub_if_on_pg3.sw_if_index,
                    type=FibPathType.FIB_PATH_TYPE_DVR,
                )
            ],
        )
        route_with_tag.add_vpp_config()

        #
        # Inject the packet that arrives non-tag and leaves on a tagged
        # interface
        #
        rx = self.send_and_expect(self.pg0, pkt_tag * NUM_PKTS, self.pg3)
        self.assert_same_mac_addr(pkt_tag, rx)
        self.assert_has_vlan_tag(93, rx)

        #
        # Tag to tag
        #
        pkt_tag_to_tag = (
            Ether(src=self.pg2.remote_mac, dst=self.loop0.local_mac)
            / Dot1Q(vlan=92)
            / IP(src=any_src_addr, dst=ip_tag_bridged)
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )

        rx = self.send_and_expect(self.pg2, pkt_tag_to_tag * NUM_PKTS, self.pg3)
        self.assert_same_mac_addr(pkt_tag_to_tag, rx)
        self.assert_has_vlan_tag(93, rx)

        #
        # Tag to non-Tag
        #
        pkt_tag_to_non_tag = (
            Ether(src=self.pg2.remote_mac, dst=self.loop0.local_mac)
            / Dot1Q(vlan=92)
            / IP(src=any_src_addr, dst=ip_non_tag_bridged)
            / UDP(sport=1234, dport=1234)
            / Raw(b"\xa5" * 100)
        )

        rx = self.send_and_expect(self.pg2, pkt_tag_to_non_tag * NUM_PKTS, self.pg1)
        self.assert_same_mac_addr(pkt_tag_to_tag, rx)
        self.assert_has_no_tag(rx)

        #
        # Add an output L3 ACL that will block the traffic
        #
        rule_1 = AclRule(
            is_permit=0,
            proto=17,
            ports=1234,
            src_prefix=IPv4Network((any_src_addr, 32)),
            dst_prefix=IPv4Network((ip_non_tag_bridged, 32)),
        )
        acl = VppAcl(self, rules=[rule_1])
        acl.add_vpp_config()

        #
        # Apply the ACL on the output interface
        #
        acl_if1 = VppAclInterface(
            self, sw_if_index=self.pg1.sw_if_index, n_input=0, acls=[acl]
        )
        acl_if1.add_vpp_config()

        #
        # Send packet's that should match the ACL and be dropped
        #
        rx = self.send_and_assert_no_replies(self.pg2, pkt_tag_to_non_tag * NUM_PKTS)

        #
        # cleanup
        #
        acl_if1.remove_vpp_config()
        acl.remove_vpp_config()

        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.pg0.sw_if_index, bd_id=1, enable=0
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.pg1.sw_if_index, bd_id=1, enable=0
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1, enable=0
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1, enable=0
        )
        self.vapi.sw_interface_set_l2_bridge(
            rx_sw_if_index=self.loop0.sw_if_index,
            bd_id=1,
            port_type=L2_PORT_TYPE.BVI,
            enable=0,
        )

        #
        # Do a FIB dump to make sure the paths are correctly reported as DVR
        #
        routes = self.vapi.ip_route_dump(0)

        for r in routes:
            if ip_tag_bridged == str(r.route.prefix.network_address):
                self.assertEqual(
                    r.route.paths[0].sw_if_index, sub_if_on_pg3.sw_if_index
                )
                self.assertEqual(r.route.paths[0].type, FibPathType.FIB_PATH_TYPE_DVR)
            if ip_non_tag_bridged == str(r.route.prefix.network_address):
                self.assertEqual(r.route.paths[0].sw_if_index, self.pg1.sw_if_index)
                self.assertEqual(r.route.paths[0].type, FibPathType.FIB_PATH_TYPE_DVR)

        #
        # the explicit route delete is require so it happens before
        # the sbu-interface delete. subinterface delete is required
        # because that object type does not use the object registry
        #
        route_no_tag.remove_vpp_config()
        route_with_tag.remove_vpp_config()
        sub_if_on_pg3.remove_vpp_config()
        sub_if_on_pg2.remove_vpp_config()


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