test/test_vxlan_gbp.py

   1 #!/usr/bin/env python
   2
   3 import socket
   4 from util import ip4_range, reassemble4_ether
   5 import unittest
   6 from framework import VppTestCase, VppTestRunner
   7 from template_bd import BridgeDomain
   8 from vpp_ip import VppIpAddress
   9
  10 from scapy.layers.l2 import Ether, Raw
  11 from scapy.layers.inet import IP, UDP
  12 from scapy.layers.vxlan import VXLAN
  13 from scapy.utils import atol
  14
  15
  16 class TestVxlanGbp(VppTestCase):
  17     """ VXLAN GBP Test Case """
  18
  19     @property
  20     def frame_request(self):
  21         """ Ethernet frame modeling a generic request """
  22         return (Ether(src='00:00:00:00:00:01', dst='00:00:00:00:00:02') /
  23                 IP(src='1.2.3.4', dst='4.3.2.1') /
  24                 UDP(sport=10000, dport=20000) /
  25                 Raw('\xa5' * 100))
  26
  27     @property
  28     def frame_reply(self):
  29         """ Ethernet frame modeling a generic reply """
  30         return (Ether(src='00:00:00:00:00:02', dst='00:00:00:00:00:01') /
  31                 IP(src='4.3.2.1', dst='1.2.3.4') /
  32                 UDP(sport=20000, dport=10000) /
  33                 Raw('\xa5' * 100))
  34
  35     def encapsulate(self, pkt, vni):
  36         """
  37         Encapsulate the original payload frame by adding VXLAN GBP header with
  38         its UDP, IP and Ethernet fields
  39         """
  40         return (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
  41                 IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
  42                 UDP(sport=self.dport, dport=self.dport, chksum=0) /
  43                 VXLAN(vni=vni, flags=self.flags, gpflags=self.gpflags,
  44                 gpid=self.sclass) / pkt)
  45
  46     def ip_range(self, start, end):
  47         """ range of remote ip's """
  48         return ip4_range(self.pg0.remote_ip4, start, end)
  49
  50     def decapsulate(self, pkt):
  51         """
  52         Decapsulate the original payload frame by removing VXLAN header
  53         """
  54         # check if is set G and I flag
  55         self.assertEqual(pkt[VXLAN].flags, int('0x88', 16))
  56         return pkt[VXLAN].payload
  57
  58     # Method for checking VXLAN GBP encapsulation.
  59     #
  60     def check_encapsulation(self, pkt, vni, local_only=False, mcast_pkt=False):
  61         # TODO: add error messages
  62         # Verify source MAC is VPP_MAC and destination MAC is MY_MAC resolved
  63         #  by VPP using ARP.
  64         self.assertEqual(pkt[Ether].src, self.pg0.local_mac)
  65         if not local_only:
  66             if not mcast_pkt:
  67                 self.assertEqual(pkt[Ether].dst, self.pg0.remote_mac)
  68             else:
  69                 self.assertEqual(pkt[Ether].dst, type(self).mcast_mac)
  70         # Verify VXLAN GBP tunnel source IP is VPP_IP and destination IP is
  71         # MY_IP.
  72         self.assertEqual(pkt[IP].src, self.pg0.local_ip4)
  73         if not local_only:
  74             if not mcast_pkt:
  75                 self.assertEqual(pkt[IP].dst, self.pg0.remote_ip4)
  76             else:
  77                 self.assertEqual(pkt[IP].dst, type(self).mcast_ip4)
  78         # Verify UDP destination port is VXLAN GBP 48879, source UDP port could
  79         # be arbitrary.
  80         self.assertEqual(pkt[UDP].dport, type(self).dport)
  81         # TODO: checksum check
  82         # Verify VNI
  83         # pkt.show()
  84         self.assertEqual(pkt[VXLAN].vni, vni)
  85         # Verify Source Class
  86         self.assertEqual(pkt[VXLAN].gpid, 0)
  87
  88     @classmethod
  89     def create_vxlan_gbp_flood_test_bd(cls, vni, n_ucast_tunnels):
  90         # Create 2 ucast vxlan tunnels under bd
  91         ip_range_start = 10
  92         ip_range_end = ip_range_start + n_ucast_tunnels
  93         next_hop_address = cls.pg0.remote_ip4n
  94         for dest_ip4 in ip4_range(cls.pg0.remote_ip4,
  95                                   ip_range_start,
  96                                   ip_range_end):
  97             # add host route so dest_ip4n will not be resolved
  98             vip = VppIpAddress(dest_ip4)
  99             cls.vapi.ip_add_del_route(dst_address=vip.bytes,
 100                                       dst_address_length=32,
 101                                       next_hop_address=next_hop_address)
 102             r = cls.vapi.vxlan_gbp_tunnel_add_del(
 103                 VppIpAddress(cls.pg0.local_ip4).encode(),
 104                 vip.encode(),
 105                 vni=vni)
 106             cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
 107                                                 bd_id=vni)
 108
 109     # Class method to start the VXLAN GBP test case.
 110     #  Overrides setUpClass method in VppTestCase class.
 111     #  Python try..except statement is used to ensure that the tear down of
 112     #  the class will be executed even if exception is raised.
 113     #  @param cls The class pointer.
 114     @classmethod
 115     def setUpClass(cls):
 116         super(TestVxlanGbp, cls).setUpClass()
 117
 118         try:
 119             cls.dport = 48879
 120             cls.flags = 0x88
 121             cls.gpflags = 0x0
 122             cls.sclass = 0
 123
 124             # Create 2 pg interfaces.
 125             cls.create_pg_interfaces(range(4))
 126             for pg in cls.pg_interfaces:
 127                 pg.admin_up()
 128
 129             # Configure IPv4 addresses on VPP pg0.
 130             cls.pg0.config_ip4()
 131
 132             # Resolve MAC address for VPP's IP address on pg0.
 133             cls.pg0.resolve_arp()
 134
 135             # Create VXLAN GBP VTEP on VPP pg0, and put vxlan_gbp_tunnel0 and
 136             # pg1 into BD.
 137             cls.single_tunnel_bd = 1
 138             r = cls.vapi.vxlan_gbp_tunnel_add_del(
 139                 VppIpAddress(cls.pg0.local_ip4).encode(),
 140                 VppIpAddress(cls.pg0.remote_ip4).encode(),
 141                 vni=cls.single_tunnel_bd)
 142             cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
 143                                                 bd_id=cls.single_tunnel_bd)
 144             cls.vapi.sw_interface_set_l2_bridge(
 145                 rx_sw_if_index=cls.pg1.sw_if_index, bd_id=cls.single_tunnel_bd)
 146
 147             # Setup vni 2 to test multicast flooding
 148             cls.n_ucast_tunnels = 2
 149             # Setup vni 3 to test unicast flooding
 150             cls.ucast_flood_bd = 3
 151             cls.create_vxlan_gbp_flood_test_bd(cls.ucast_flood_bd,
 152                                                cls.n_ucast_tunnels)
 153             cls.vapi.sw_interface_set_l2_bridge(
 154                 rx_sw_if_index=cls.pg3.sw_if_index, bd_id=cls.ucast_flood_bd)
 155         except Exception:
 156             super(TestVxlanGbp, cls).tearDownClass()
 157             raise
 158
 159     def assert_eq_pkts(self, pkt1, pkt2):
 160         """ Verify the Ether, IP, UDP, payload are equal in both
 161         packets
 162         """
 163         self.assertEqual(pkt1[Ether].src, pkt2[Ether].src)
 164         self.assertEqual(pkt1[Ether].dst, pkt2[Ether].dst)
 165         self.assertEqual(pkt1[IP].src, pkt2[IP].src)
 166         self.assertEqual(pkt1[IP].dst, pkt2[IP].dst)
 167         self.assertEqual(pkt1[UDP].sport, pkt2[UDP].sport)
 168         self.assertEqual(pkt1[UDP].dport, pkt2[UDP].dport)
 169         self.assertEqual(pkt1[Raw], pkt2[Raw])
 170
 171     def test_decap(self):
 172         """ Decapsulation test
 173         Send encapsulated frames from pg0
 174         Verify receipt of decapsulated frames on pg1
 175         """
 176         encapsulated_pkt = self.encapsulate(self.frame_request,
 177                                             self.single_tunnel_bd)
 178
 179         self.pg0.add_stream([encapsulated_pkt, ])
 180
 181         self.pg1.enable_capture()
 182
 183         self.pg_start()
 184
 185         # Pick first received frame and check if it's the non-encapsulated
 186         # frame
 187         out = self.pg1.get_capture(1)
 188         pkt = out[0]
 189         self.assert_eq_pkts(pkt, self.frame_request)
 190
 191     def test_encap(self):
 192         """ Encapsulation test
 193         Send frames from pg1
 194         Verify receipt of encapsulated frames on pg0
 195         """
 196         self.pg1.add_stream([self.frame_reply])
 197
 198         self.pg0.enable_capture()
 199
 200         self.pg_start()
 201
 202         # Pick first received frame and check if it's correctly encapsulated.
 203         out = self.pg0.get_capture(1)
 204         pkt = out[0]
 205         self.check_encapsulation(pkt, self.single_tunnel_bd)
 206
 207         payload = self.decapsulate(pkt)
 208         self.assert_eq_pkts(payload, self.frame_reply)
 209
 210     def test_ucast_flood(self):
 211         """ Unicast flood test
 212         Send frames from pg3
 213         Verify receipt of encapsulated frames on pg0
 214         """
 215         self.pg3.add_stream([self.frame_reply])
 216
 217         self.pg0.enable_capture()
 218
 219         self.pg_start()
 220
 221         # Get packet from each tunnel and assert it's correctly encapsulated.
 222         out = self.pg0.get_capture(self.n_ucast_tunnels)
 223         for pkt in out:
 224             self.check_encapsulation(pkt, self.ucast_flood_bd, True)
 225             payload = self.decapsulate(pkt)
 226             self.assert_eq_pkts(payload, self.frame_reply)
 227
 228     def test_encap_big_packet(self):
 229         """ Encapsulation test send big frame from pg1
 230         Verify receipt of encapsulated frames on pg0
 231         """
 232
 233         self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [1500, 0, 0, 0])
 234
 235         frame = (Ether(src='00:00:00:00:00:02', dst='00:00:00:00:00:01') /
 236                  IP(src='4.3.2.1', dst='1.2.3.4') /
 237                  UDP(sport=20000, dport=10000) /
 238                  Raw('\xa5' * 1450))
 239
 240         self.pg1.add_stream([frame])
 241
 242         self.pg0.enable_capture()
 243
 244         self.pg_start()
 245
 246         # Pick first received frame and check if it's correctly encapsulated.
 247         out = self.pg0.get_capture(2)
 248         pkt = reassemble4_ether(out)
 249         self.check_encapsulation(pkt, self.single_tunnel_bd)
 250
 251         payload = self.decapsulate(pkt)
 252         self.assert_eq_pkts(payload, frame)
 253
 254 # Method to define VPP actions before tear down of the test case.
 255 #  Overrides tearDown method in VppTestCase class.
 256 #  @param self The object pointer.
 257     def tearDown(self):
 258         super(TestVxlanGbp, self).tearDown()
 259         if not self.vpp_dead:
 260             self.logger.info(self.vapi.cli("show bridge-domain 1 detail"))
 261             self.logger.info(self.vapi.cli("show bridge-domain 3 detail"))
 262             self.logger.info(self.vapi.cli("show vxlan-gbp tunnel"))
 263             self.logger.info(self.vapi.cli("show error"))
 264
 265
 266 if __name__ == '__main__':
 267     unittest.main(testRunner=VppTestRunner)