test/test_l2bd.py

   1 #!/usr/bin/env python
   2
   3 import unittest
   4 from logging import *
   5 import random
   6
   7 from scapy.packet import Raw
   8 from scapy.layers.l2 import Ether, Dot1Q
   9 from scapy.layers.inet import IP, UDP
  10
  11 from framework import VppTestCase, VppTestRunner
  12 from vpp_sub_interface import VppDot1QSubint
  13 from util import TestHost
  14
  15
  16 class TestL2bd(VppTestCase):
  17     """ L2BD Test Case """
  18
  19     # Test variables
  20     bd_id = 1                 # Bridge domain ID
  21     mac_entries_count = 100   # Number of MAC entries for bridge-domain to learn
  22     dot1q_sub_id = 100        # SubID of dot1q sub-interface
  23     dot1q_tag = 100           # VLAN tag for dot1q sub-interface
  24     dot1ad_sub_id = 200       # SubID of dot1ad sub-interface
  25     dot1ad_outer_tag = 200    # VLAN S-tag for dot1ad sub-interface
  26     dot1ad_inner_tag = 300    # VLAN C-tag for dot1ad sub-interface
  27     pkts_per_burst = 257      # Number of packets per burst
  28
  29     @classmethod
  30     def setUpClass(cls):
  31         super(TestL2bd, cls).setUpClass()
  32
  33     def setUp(self):
  34         super(TestL2bd, self).setUp()
  35
  36         # create 3 pg interfaces
  37         self.create_pg_interfaces(range(3))
  38
  39         # create 2 sub-interfaces for pg1 and pg2
  40         self.sub_interfaces = [
  41             VppDot1QSubint(self, self.pg1, TestL2bd.dot1q_sub_id),
  42             VppDot1QSubint(self, self.pg2, TestL2bd.dot1ad_sub_id)]
  43
  44         # packet flows mapping pg0 -> pg1, pg2, etc.
  45         self.flows = dict()
  46         self.flows[self.pg0] = [self.pg1, self.pg2]
  47         self.flows[self.pg1] = [self.pg0, self.pg2]
  48         self.flows[self.pg2] = [self.pg0, self.pg1]
  49
  50         # packet sizes
  51         self.pg_if_packet_sizes = [64, 512, 1518, 9018]
  52         self.sub_if_packet_sizes = [64, 512, 1518 + 4, 9018 + 4]
  53
  54         self.interfaces = list(self.pg_interfaces)
  55         self.interfaces.extend(self.sub_interfaces)
  56
  57         # Create BD with MAC learning enabled and put interfaces and
  58         #  sub-interfaces to this BD
  59         for pg_if in self.pg_interfaces:
  60             sw_if_index = pg_if.sub_if.sw_if_index if hasattr(pg_if, 'sub_if') \
  61                 else pg_if.sw_if_index
  62             self.vapi.sw_interface_set_l2_bridge(sw_if_index,
  63                                                  bd_id=TestL2bd.bd_id)
  64
  65         # setup all interfaces
  66         for i in self.interfaces:
  67             i.admin_up()
  68
  69         # mapping between packet-generator index and lists of test hosts
  70         self.hosts_by_pg_idx = dict()
  71
  72         # create test host entries and inject packets to learn MAC entries in
  73         # the bridge-domain
  74         self.create_hosts_and_learn(TestL2bd.mac_entries_count)
  75         info(self.vapi.cli("show l2fib"))
  76
  77     def tearDown(self):
  78         super(TestL2bd, self).tearDown()
  79         if not self.vpp_dead:
  80             info(self.vapi.cli("show l2fib verbose"))
  81             info(self.vapi.cli("show bridge-domain %s detail" % self.bd_id))
  82
  83     def create_hosts_and_learn(self, count):
  84         """
  85         Create required number of host MAC addresses and distribute them among
  86         interfaces. Create host IPv4 address for every host MAC address. Create
  87         L2 MAC packet stream with host MAC addresses per interface to let
  88         the bridge domain learn these MAC addresses.
  89
  90         :param count: Integer number of hosts to create MAC/IPv4 addresses for.
  91         """
  92         n_int = len(self.pg_interfaces)
  93         macs_per_if = count / n_int
  94         i = -1
  95         for pg_if in self.pg_interfaces:
  96             i += 1
  97             start_nr = macs_per_if * i
  98             end_nr = count if i == (n_int - 1) else macs_per_if * (i + 1)
  99             self.hosts_by_pg_idx[pg_if.sw_if_index] = []
 100             hosts = self.hosts_by_pg_idx[pg_if.sw_if_index]
 101             packets = []
 102             for j in range(start_nr, end_nr):
 103                 host = TestHost(
 104                     "00:00:00:ff:%02x:%02x" % (pg_if.sw_if_index, j),
 105                     "172.17.1%02x.%u" % (pg_if.sw_if_index, j))
 106                 packet = (Ether(dst="ff:ff:ff:ff:ff:ff", src=host.mac))
 107                 hosts.append(host)
 108                 if hasattr(pg_if, 'sub_if'):
 109                     packet = pg_if.sub_if.add_dot1_layer(packet)
 110                 packets.append(packet)
 111             pg_if.add_stream(packets)
 112         info("Sending broadcast eth frames for MAC learning")
 113         self.pg_start()
 114
 115     def create_stream(self, src_if, packet_sizes):
 116         pkts = []
 117         for i in range(0, TestL2bd.pkts_per_burst):
 118             dst_if = self.flows[src_if][i % 2]
 119             dst_host = random.choice(self.hosts_by_pg_idx[dst_if.sw_if_index])
 120             src_host = random.choice(self.hosts_by_pg_idx[src_if.sw_if_index])
 121             pkt_info = self.create_packet_info(
 122                 src_if.sw_if_index, dst_if.sw_if_index)
 123             payload = self.info_to_payload(pkt_info)
 124             p = (Ether(dst=dst_host.mac, src=src_host.mac) /
 125                  IP(src=src_host.ip4, dst=dst_host.ip4) /
 126                  UDP(sport=1234, dport=1234) /
 127                  Raw(payload))
 128             pkt_info.data = p.copy()
 129             if hasattr(src_if, 'sub_if'):
 130                 p = src_if.sub_if.add_dot1_layer(p)
 131             size = packet_sizes[(i / 2) % len(packet_sizes)]
 132             self.extend_packet(p, size)
 133             pkts.append(p)
 134         return pkts
 135
 136     def verify_capture(self, pg_if, capture):
 137         last_info = dict()
 138         for i in self.pg_interfaces:
 139             last_info[i.sw_if_index] = None
 140         dst_sw_if_index = pg_if.sw_if_index
 141         for packet in capture:
 142             payload_info = self.payload_to_info(str(packet[Raw]))
 143             src_sw_if_index = payload_info.src
 144             src_if = None
 145             for ifc in self.pg_interfaces:
 146                 if ifc != pg_if:
 147                     if ifc.sw_if_index == src_sw_if_index:
 148                         src_if = ifc
 149                         break
 150             if hasattr(src_if, 'sub_if'):
 151                 # Check VLAN tags and Ethernet header
 152                 packet = src_if.sub_if.remove_dot1_layer(packet)
 153             self.assertTrue(Dot1Q not in packet)
 154             try:
 155                 ip = packet[IP]
 156                 udp = packet[UDP]
 157                 packet_index = payload_info.index
 158                 self.assertEqual(payload_info.dst, dst_sw_if_index)
 159                 debug("Got packet on port %s: src=%u (id=%u)" %
 160                       (pg_if.name, payload_info.src, packet_index))
 161                 next_info = self.get_next_packet_info_for_interface2(
 162                     payload_info.src, dst_sw_if_index,
 163                     last_info[payload_info.src])
 164                 last_info[payload_info.src] = next_info
 165                 self.assertTrue(next_info is not None)
 166                 self.assertEqual(packet_index, next_info.index)
 167                 saved_packet = next_info.data
 168                 # Check standard fields
 169                 self.assertEqual(ip.src, saved_packet[IP].src)
 170                 self.assertEqual(ip.dst, saved_packet[IP].dst)
 171                 self.assertEqual(udp.sport, saved_packet[UDP].sport)
 172                 self.assertEqual(udp.dport, saved_packet[UDP].dport)
 173             except:
 174                 error("Unexpected or invalid packet:")
 175                 error(packet.show())
 176                 raise
 177         for i in self.pg_interfaces:
 178             remaining_packet = self.get_next_packet_info_for_interface2(
 179                 i, dst_sw_if_index, last_info[i.sw_if_index])
 180             self.assertTrue(
 181                 remaining_packet is None,
 182                 "Port %u: Packet expected from source %u didn't arrive" %
 183                 (dst_sw_if_index, i.sw_if_index))
 184
 185     def test_l2bd(self):
 186         """ L2BD MAC learning test
 187
 188         1.config
 189             MAC learning enabled
 190             learn 100 MAC enries
 191             3 interfaces: untagged, dot1q, dot1ad (dot1q used instead of dot1ad
 192             in the first version)
 193
 194         2.sending l2 eth pkts between 3 interface
 195             64B, 512B, 1518B, 9200B (ether_size)
 196             burst of 257 pkts per interface
 197         """
 198
 199         # Create incoming packet streams for packet-generator interfaces
 200         for i in self.pg_interfaces:
 201             packet_sizes = self.sub_if_packet_sizes if hasattr(i, 'sub_if') \
 202                 else self.pg_if_packet_sizes
 203             pkts = self.create_stream(i, packet_sizes)
 204             i.add_stream(pkts)
 205
 206         # Enable packet capture and start packet sending
 207         self.pg_enable_capture(self.pg_interfaces)
 208         self.pg_start()
 209
 210         # Verify outgoing packet streams per packet-generator interface
 211         for i in self.pg_interfaces:
 212             capture = i.get_capture()
 213             info("Verifying capture on interface %s" % i.name)
 214             self.verify_capture(i, capture)
 215
 216
 217 if __name__ == '__main__':
 218     unittest.main(testRunner=VppTestRunner)