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#!/usr/bin/env python3
import unittest
from framework import VppTestCase, 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, inet_pton
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)
|
