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 = (
  76             Ether(src=self.pg0.remote_mac, dst=self.loop0.local_mac)
  77             / IP(src=any_src_addr, dst=ip_non_tag_bridged)
  78             / UDP(sport=1234, dport=1234)
  79             / Raw(b"\xa5" * 100)
  80         )
  81         pkt_tag = (
  82             Ether(src=self.pg0.remote_mac, dst=self.loop0.local_mac)
  83             / IP(src=any_src_addr, dst=ip_tag_bridged)
  84             / UDP(sport=1234, dport=1234)
  85             / Raw(b"\xa5" * 100)
  86         )
  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         )
 102         self.vapi.sw_interface_set_l2_bridge(
 103             rx_sw_if_index=self.pg1.sw_if_index, bd_id=1
 104         )
 105         self.vapi.sw_interface_set_l2_bridge(
 106             rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1
 107         )
 108         self.vapi.sw_interface_set_l2_bridge(
 109             rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1
 110         )
 111         self.vapi.sw_interface_set_l2_bridge(
 112             rx_sw_if_index=self.loop0.sw_if_index, bd_id=1, port_type=L2_PORT_TYPE.BVI
 113         )
 114
 115         self.vapi.l2_interface_vlan_tag_rewrite(
 116             sw_if_index=sub_if_on_pg2.sw_if_index,
 117             vtr_op=L2_VTR_OP.L2_POP_1,
 118             push_dot1q=92,
 119         )
 120         self.vapi.l2_interface_vlan_tag_rewrite(
 121             sw_if_index=sub_if_on_pg3.sw_if_index,
 122             vtr_op=L2_VTR_OP.L2_POP_1,
 123             push_dot1q=93,
 124         )
 125
 126         #
 127         # Add routes to bridge the traffic via a tagged an nontagged interface
 128         #
 129         route_no_tag = VppIpRoute(
 130             self,
 131             ip_non_tag_bridged,
 132             32,
 133             [
 134                 VppRoutePath(
 135                     "0.0.0.0", self.pg1.sw_if_index, type=FibPathType.FIB_PATH_TYPE_DVR
 136                 )
 137             ],
 138         )
 139         route_no_tag.add_vpp_config()
 140
 141         #
 142         # Inject the packet that arrives and leaves on a non-tagged interface
 143         # Since it's 'bridged' expect that the MAC headed is unchanged.
 144         #
 145         rx = self.send_and_expect(self.pg0, pkt_no_tag * NUM_PKTS, self.pg1)
 146         self.assert_same_mac_addr(pkt_no_tag, rx)
 147         self.assert_has_no_tag(rx)
 148
 149         #
 150         # Add routes to bridge the traffic via a tagged interface
 151         #
 152         route_with_tag = VppIpRoute(
 153             self,
 154             ip_tag_bridged,
 155             32,
 156             [
 157                 VppRoutePath(
 158                     "0.0.0.0",
 159                     sub_if_on_pg3.sw_if_index,
 160                     type=FibPathType.FIB_PATH_TYPE_DVR,
 161                 )
 162             ],
 163         )
 164         route_with_tag.add_vpp_config()
 165
 166         #
 167         # Inject the packet that arrives non-tag and leaves on a tagged
 168         # interface
 169         #
 170         rx = self.send_and_expect(self.pg0, pkt_tag * NUM_PKTS, self.pg3)
 171         self.assert_same_mac_addr(pkt_tag, rx)
 172         self.assert_has_vlan_tag(93, rx)
 173
 174         #
 175         # Tag to tag
 176         #
 177         pkt_tag_to_tag = (
 178             Ether(src=self.pg2.remote_mac, dst=self.loop0.local_mac)
 179             / Dot1Q(vlan=92)
 180             / IP(src=any_src_addr, dst=ip_tag_bridged)
 181             / UDP(sport=1234, dport=1234)
 182             / Raw(b"\xa5" * 100)
 183         )
 184
 185         rx = self.send_and_expect(self.pg2, pkt_tag_to_tag * NUM_PKTS, self.pg3)
 186         self.assert_same_mac_addr(pkt_tag_to_tag, rx)
 187         self.assert_has_vlan_tag(93, rx)
 188
 189         #
 190         # Tag to non-Tag
 191         #
 192         pkt_tag_to_non_tag = (
 193             Ether(src=self.pg2.remote_mac, dst=self.loop0.local_mac)
 194             / Dot1Q(vlan=92)
 195             / IP(src=any_src_addr, dst=ip_non_tag_bridged)
 196             / UDP(sport=1234, dport=1234)
 197             / Raw(b"\xa5" * 100)
 198         )
 199
 200         rx = self.send_and_expect(self.pg2, pkt_tag_to_non_tag * NUM_PKTS, self.pg1)
 201         self.assert_same_mac_addr(pkt_tag_to_tag, rx)
 202         self.assert_has_no_tag(rx)
 203
 204         #
 205         # Add an output L3 ACL that will block the traffic
 206         #
 207         rule_1 = AclRule(
 208             is_permit=0,
 209             proto=17,
 210             ports=1234,
 211             src_prefix=IPv4Network((any_src_addr, 32)),
 212             dst_prefix=IPv4Network((ip_non_tag_bridged, 32)),
 213         )
 214         acl = VppAcl(self, rules=[rule_1])
 215         acl.add_vpp_config()
 216
 217         #
 218         # Apply the ACL on the output interface
 219         #
 220         acl_if1 = VppAclInterface(
 221             self, sw_if_index=self.pg1.sw_if_index, n_input=0, acls=[acl]
 222         )
 223         acl_if1.add_vpp_config()
 224
 225         #
 226         # Send packet's that should match the ACL and be dropped
 227         #
 228         rx = self.send_and_assert_no_replies(self.pg2, pkt_tag_to_non_tag * NUM_PKTS)
 229
 230         #
 231         # cleanup
 232         #
 233         acl_if1.remove_vpp_config()
 234         acl.remove_vpp_config()
 235
 236         self.vapi.sw_interface_set_l2_bridge(
 237             rx_sw_if_index=self.pg0.sw_if_index, bd_id=1, enable=0
 238         )
 239         self.vapi.sw_interface_set_l2_bridge(
 240             rx_sw_if_index=self.pg1.sw_if_index, bd_id=1, enable=0
 241         )
 242         self.vapi.sw_interface_set_l2_bridge(
 243             rx_sw_if_index=sub_if_on_pg2.sw_if_index, bd_id=1, enable=0
 244         )
 245         self.vapi.sw_interface_set_l2_bridge(
 246             rx_sw_if_index=sub_if_on_pg3.sw_if_index, bd_id=1, enable=0
 247         )
 248         self.vapi.sw_interface_set_l2_bridge(
 249             rx_sw_if_index=self.loop0.sw_if_index,
 250             bd_id=1,
 251             port_type=L2_PORT_TYPE.BVI,
 252             enable=0,
 253         )
 254
 255         #
 256         # Do a FIB dump to make sure the paths are correctly reported as DVR
 257         #
 258         routes = self.vapi.ip_route_dump(0)
 259
 260         for r in routes:
 261             if ip_tag_bridged == str(r.route.prefix.network_address):
 262                 self.assertEqual(
 263                     r.route.paths[0].sw_if_index, sub_if_on_pg3.sw_if_index
 264                 )
 265                 self.assertEqual(r.route.paths[0].type, FibPathType.FIB_PATH_TYPE_DVR)
 266             if ip_non_tag_bridged == str(r.route.prefix.network_address):
 267                 self.assertEqual(r.route.paths[0].sw_if_index, self.pg1.sw_if_index)
 268                 self.assertEqual(r.route.paths[0].type, FibPathType.FIB_PATH_TYPE_DVR)
 269
 270         #
 271         # the explicit route delete is require so it happens before
 272         # the sbu-interface delete. subinterface delete is required
 273         # because that object type does not use the object registry
 274         #
 275         route_no_tag.remove_vpp_config()
 276         route_with_tag.remove_vpp_config()
 277         sub_if_on_pg3.remove_vpp_config()
 278         sub_if_on_pg2.remove_vpp_config()
 279
 280
 281 if __name__ == "__main__":
 282     unittest.main(testRunner=VppTestRunner)