test/test_dvr.py

   1 #!/usr/bin/env python3
   2 import unittest
   3
   4 from framework import VppTestCase, VppTestRunner
   5 from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathType
   6 from vpp_l2 import L2_PORT_TYPE
   7 from vpp_sub_interface import L2_VTR_OP, VppDot1QSubint
   8 from vpp_acl import AclRule, VppAcl, VppAclInterface
   9
  10 from scapy.packet import Raw
  11 from scapy.layers.l2 import Ether, Dot1Q
  12 from scapy.layers.inet import IP, UDP
  13 from socket import AF_INET, inet_pton
  14 from ipaddress import IPv4Network
  15
  16 NUM_PKTS = 67
  17
  18
  19 class TestDVR(VppTestCase):
  20     """ Distributed Virtual Router """
  21
  22     @classmethod
  23     def setUpClass(cls):
  24         super(TestDVR, cls).setUpClass()
  25
  26     @classmethod
  27     def tearDownClass(cls):
  28         super(TestDVR, cls).tearDownClass()
  29
  30     def setUp(self):
  31         super(TestDVR, self).setUp()
  32
  33         self.create_pg_interfaces(range(4))
  34         self.create_loopback_interfaces(1)
  35
  36         for i in self.pg_interfaces:
  37             i.admin_up()
  38
  39         self.loop0.config_ip4()
  40
  41     def tearDown(self):
  42         for i in self.pg_interfaces:
  43             i.admin_down()
  44         self.loop0.unconfig_ip4()
  45
  46         super(TestDVR, self).tearDown()
  47
  48     def assert_same_mac_addr(self, tx, rx):
  49         t_eth = tx[Ether]
  50         for p in rx:
  51             r_eth = p[Ether]
  52             self.assertEqual(t_eth.src, r_eth.src)
  53             self.assertEqual(t_eth.dst, r_eth.dst)
  54
  55     def assert_has_vlan_tag(self, tag, rx):
  56         for p in rx:
  57             r_1q = p[Dot1Q]
  58             self.assertEqual(tag, r_1q.vlan)
  59
  60     def assert_has_no_tag(self, rx):
  61         for p in rx:
  62             self.assertFalse(p.haslayer(Dot1Q))
  63
  64     def test_dvr(self):
  65         """ Distributed Virtual Router """
  66
  67         #
  68         # A packet destined to an IP address that is L2 bridged via
  69         # a non-tag interface
  70         #
  71         ip_non_tag_bridged = "10.10.10.10"
  72         ip_tag_bridged = "10.10.10.11"
  73         any_src_addr = "1.1.1.1"
  74
  75         pkt_no_tag = (Ether(src=self.pg0.remote_mac,
  76                             dst=self.loop0.local_mac) /
  77                       IP(src=any_src_addr,
  78                          dst=ip_non_tag_bridged) /
  79                       UDP(sport=1234, dport=1234) /
  80                       Raw(b'\xa5' * 100))
  81         pkt_tag = (Ether(src=self.pg0.remote_mac,
  82                          dst=self.loop0.local_mac) /
  83                    IP(src=any_src_addr,
  84                       dst=ip_tag_bridged) /
  85                    UDP(sport=1234, dport=1234) /
  86                    Raw(b'\xa5' * 100))
  87
  88         #
  89         # Two sub-interfaces so we can test VLAN tag push/pop
  90         #
  91         sub_if_on_pg2 = VppDot1QSubint(self, self.pg2, 92)
  92         sub_if_on_pg3 = VppDot1QSubint(self, self.pg3, 93)
  93         sub_if_on_pg2.admin_up()
  94         sub_if_on_pg3.admin_up()
  95
  96         #
  97         # Put all the interfaces into a new bridge domain
  98         #
  99         self.vapi.sw_interface_set_l2_bridge(
 100             rx_sw_if_index=self.pg0.sw_if_index, bd_id=1)
 101         self.vapi.sw_interface_set_l2_bridge(
 102             rx_sw_if_index=self.pg1.sw_if_index, bd_id=1)
 103         self.vapi.sw_interface_set_l2_bridge(
 104             rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1)
 105         self.vapi.sw_interface_set_l2_bridge(
 106             rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1)
 107         self.vapi.sw_interface_set_l2_bridge(
 108             rx_sw_if_index=self.loop0.sw_if_index, bd_id=1,
 109             port_type=L2_PORT_TYPE.BVI)
 110
 111         self.vapi.l2_interface_vlan_tag_rewrite(
 112             sw_if_index=sub_if_on_pg2.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
 113             push_dot1q=92)
 114         self.vapi.l2_interface_vlan_tag_rewrite(
 115             sw_if_index=sub_if_on_pg3.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
 116             push_dot1q=93)
 117
 118         #
 119         # Add routes to bridge the traffic via a tagged an nontagged interface
 120         #
 121         route_no_tag = VppIpRoute(
 122             self, ip_non_tag_bridged, 32,
 123             [VppRoutePath("0.0.0.0",
 124                           self.pg1.sw_if_index,
 125                           type=FibPathType.FIB_PATH_TYPE_DVR)])
 126         route_no_tag.add_vpp_config()
 127
 128         #
 129         # Inject the packet that arrives and leaves on a non-tagged interface
 130         # Since it's 'bridged' expect that the MAC headed is unchanged.
 131         #
 132         rx = self.send_and_expect(self.pg0, pkt_no_tag * NUM_PKTS, self.pg1)
 133         self.assert_same_mac_addr(pkt_no_tag, rx)
 134         self.assert_has_no_tag(rx)
 135
 136         #
 137         # Add routes to bridge the traffic via a tagged interface
 138         #
 139         route_with_tag = VppIpRoute(
 140             self, ip_tag_bridged, 32,
 141             [VppRoutePath("0.0.0.0",
 142                           sub_if_on_pg3.sw_if_index,
 143                           type=FibPathType.FIB_PATH_TYPE_DVR)])
 144         route_with_tag.add_vpp_config()
 145
 146         #
 147         # Inject the packet that arrives non-tag and leaves on a tagged
 148         # interface
 149         #
 150         rx = self.send_and_expect(self.pg0, pkt_tag * NUM_PKTS, self.pg3)
 151         self.assert_same_mac_addr(pkt_tag, rx)
 152         self.assert_has_vlan_tag(93, rx)
 153
 154         #
 155         # Tag to tag
 156         #
 157         pkt_tag_to_tag = (Ether(src=self.pg2.remote_mac,
 158                                 dst=self.loop0.local_mac) /
 159                           Dot1Q(vlan=92) /
 160                           IP(src=any_src_addr,
 161                              dst=ip_tag_bridged) /
 162                           UDP(sport=1234, dport=1234) /
 163                           Raw(b'\xa5' * 100))
 164
 165         rx = self.send_and_expect(self.pg2,
 166                                   pkt_tag_to_tag * NUM_PKTS,
 167                                   self.pg3)
 168         self.assert_same_mac_addr(pkt_tag_to_tag, rx)
 169         self.assert_has_vlan_tag(93, rx)
 170
 171         #
 172         # Tag to non-Tag
 173         #
 174         pkt_tag_to_non_tag = (Ether(src=self.pg2.remote_mac,
 175                                     dst=self.loop0.local_mac) /
 176                               Dot1Q(vlan=92) /
 177                               IP(src=any_src_addr,
 178                                  dst=ip_non_tag_bridged) /
 179                               UDP(sport=1234, dport=1234) /
 180                               Raw(b'\xa5' * 100))
 181
 182         rx = self.send_and_expect(self.pg2,
 183                                   pkt_tag_to_non_tag * NUM_PKTS,
 184                                   self.pg1)
 185         self.assert_same_mac_addr(pkt_tag_to_tag, rx)
 186         self.assert_has_no_tag(rx)
 187
 188         #
 189         # Add an output L3 ACL that will block the traffic
 190         #
 191         rule_1 = AclRule(is_permit=0, proto=17, ports=1234,
 192                          src_prefix=IPv4Network((any_src_addr, 32)),
 193                          dst_prefix=IPv4Network((ip_non_tag_bridged, 32)))
 194         acl = VppAcl(self, rules=[rule_1])
 195         acl.add_vpp_config()
 196
 197         #
 198         # Apply the ACL on the output interface
 199         #
 200         acl_if1 = VppAclInterface(self, sw_if_index=self.pg1.sw_if_index,
 201                                   n_input=0, acls=[acl])
 202         acl_if1.add_vpp_config()
 203
 204         #
 205         # Send packet's that should match the ACL and be dropped
 206         #
 207         rx = self.send_and_assert_no_replies(self.pg2,
 208                                              pkt_tag_to_non_tag * NUM_PKTS)
 209
 210         #
 211         # cleanup
 212         #
 213         acl_if1.remove_vpp_config()
 214         acl.remove_vpp_config()
 215
 216         self.vapi.sw_interface_set_l2_bridge(
 217             rx_sw_if_index=self.pg0.sw_if_index, bd_id=1, enable=0)
 218         self.vapi.sw_interface_set_l2_bridge(
 219             rx_sw_if_index=self.pg1.sw_if_index, bd_id=1, enable=0)
 220         self.vapi.sw_interface_set_l2_bridge(
 221             rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1, enable=0)
 222         self.vapi.sw_interface_set_l2_bridge(
 223             rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1, enable=0)
 224         self.vapi.sw_interface_set_l2_bridge(
 225             rx_sw_if_index=self.loop0.sw_if_index, bd_id=1,
 226             port_type=L2_PORT_TYPE.BVI, enable=0)
 227
 228         #
 229         # Do a FIB dump to make sure the paths are correctly reported as DVR
 230         #
 231         routes = self.vapi.ip_route_dump(0)
 232
 233         for r in routes:
 234             if (ip_tag_bridged == str(r.route.prefix.network_address)):
 235                 self.assertEqual(r.route.paths[0].sw_if_index,
 236                                  sub_if_on_pg3.sw_if_index)
 237                 self.assertEqual(r.route.paths[0].type,
 238                                  FibPathType.FIB_PATH_TYPE_DVR)
 239             if (ip_non_tag_bridged == str(r.route.prefix.network_address)):
 240                 self.assertEqual(r.route.paths[0].sw_if_index,
 241                                  self.pg1.sw_if_index)
 242                 self.assertEqual(r.route.paths[0].type,
 243                                  FibPathType.FIB_PATH_TYPE_DVR)
 244
 245         #
 246         # the explicit route delete is require so it happens before
 247         # the sbu-interface delete. subinterface delete is required
 248         # because that object type does not use the object registry
 249         #
 250         route_no_tag.remove_vpp_config()
 251         route_with_tag.remove_vpp_config()
 252         sub_if_on_pg3.remove_vpp_config()
 253         sub_if_on_pg2.remove_vpp_config()
 254
 255
 256 if __name__ == '__main__':
 257     unittest.main(testRunner=VppTestRunner)