#!/usr/bin/env python
import unittest
import random
from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q
from scapy.layers.inet import IP, UDP
from framework import VppTestCase, VppTestRunner
from util import Host, ppp
from vpp_sub_interface import VppDot1QSubint, VppDot1ADSubint
class TestL2bd(VppTestCase):
""" L2BD Test Case """
@classmethod
def setUpClass(cls):
"""
Perform standard class setup (defined by class method setUpClass in
class VppTestCase) before running the test case, set test case related
variables and configure VPP.
:var int bd_id: Bridge domain ID.
:var int mac_entries_count: Number of MAC entries for bridge-domain to
learn.
:var int dot1q_tag: VLAN tag for dot1q sub-interface.
:var int dot1ad_sub_id: SubID of dot1ad sub-interface.
:var int dot1ad_outer_tag: VLAN S-tag for dot1ad sub-interface.
:var int dot1ad_inner_tag: VLAN C-tag for dot1ad sub-interface.
:var int sl_pkts_per_burst: Number of packets in burst for single-loop
test.
:var int dl_pkts_per_burst: Number of packets in burst for dual-loop
test.
"""
super(TestL2bd, cls).setUpClass()
# Test variables
cls.bd_id = 1
cls.mac_entries_count = 100
# cls.dot1q_sub_id = 100
cls.dot1q_tag = 100
cls.dot1ad_sub_id = 20
cls.dot1ad_outer_tag = 200
cls.dot1ad_inner_tag = 300
cls.sl_pkts_per_burst = 2
cls.dl_pkts_per_burst = 257
try:
# create 3 pg interfaces
cls.create_pg_interfaces(range(3))
# create 2 sub-interfaces for pg1 and pg2
cls.sub_interfaces = [
VppDot1QSubint(cls, cls.pg1, cls.dot1q_tag),
VppDot1ADSubint(cls, cls.pg2, cls.dot1ad_sub_id,
cls.dot1ad_outer_tag, cls.dot1ad_inner_tag)]
# packet flows mapping pg0 -> pg1, pg2, etc.
cls.flows = dict()
cls.flows[cls.pg0] = [cls.pg1, cls.pg2]
cls.flows[cls.pg1] = [cls.pg0, cls.pg2]
cls.flows[cls.pg2] = [cls.pg0, cls.pg1]
# packet sizes
cls.pg_if_packet_sizes = [64, 512, 1518, 9018]
cls.sub_if_packet_sizes = [64, 512, 1518 + 4, 9018 + 4]
cls.interfaces = list(cls.pg_interfaces)
cls.interfaces.extend(cls.sub_interfaces)
# Create BD with MAC learning enabled and put interfaces and
# sub-interfaces to this BD
for pg_if in cls.pg_interfaces:
sw_if_index = pg_if.sub_if.sw_if_index \
if hasattr(pg_if, 'sub_if') else pg_if.sw_if_index
cls.vapi.sw_interface_set_l2_bridge(sw_if_index,
bd_id=cls.bd_id)
# setup all interfaces
for i in cls.interfaces:
i.admin_up()
# mapping between packet-generator index and lists of test hosts
cls.hosts_by_pg_idx = dict()
# create test host entries and inject packets to learn MAC entries
# in the bridge-domain
cls.create_hosts_and_learn(cls.mac_entries_count)
cls.logger.info(cls.vapi.ppcli("show l2fib"))
except Exception:
super(TestL2bd, cls).tearDownClass()
raise
def setUp(self):
"""
Clear trace and packet infos before running each test.
"""
super(TestL2bd, self).setUp()
self.reset_packet_infos()
def tearDown(self):
"""
Show various debug prints after each test.
"""
super(TestL2bd, self).tearDown()
if not self.vpp_dead:
self.logger.info(self.vapi.ppcli("show l2fib verbose"))
self.logger.info(self.vapi.ppcli("show bridge-domain %s detail" %
self.bd_id))
@classmethod
def create_hosts_and_learn(cls, count):
"""
Create required number of host MAC addresses and distribute them among
interfaces. Create host IPv4 address for every host MAC address. Create
L2 MAC packet stream with host MAC addresses per interface to let
the bridge domain learn these MAC addresses.
:param count: Integer number of hosts to create MAC/IPv4 addresses for.
"""
n_int = len(cls.pg_interfaces)
macs_per_if = count / n_int
i = -1
for pg_if in cls.pg_interfaces:
i += 1
start_nr = macs_per_if * i
end_nr = count if i == (n_int - 1) else macs_per_if * (i + 1)
cls.hosts_by_pg_idx[pg_if.sw_if_index] = []
hosts = cls.hosts_by_pg_idx[pg_if.sw_if_index]
packets = []
for j in range(start_nr, end_nr):
host = Host(
"00:00:00:ff:%02x:%02x" % (pg_if.sw_if_index, j),
"172.17.1%02x.%u" % (pg_if.sw_if_index, j))
packet = (Ether(dst="ff:ff:ff:ff:ff:ff", src=host.mac))
hosts.append(host)
if hasattr(pg_if, 'sub_if'):
packet = pg_if.sub_if.add_dot1_layer(packet)
packets.append(packet)
pg_if.add_stream(packets)
cls.logger.info("Sending broadcast eth frames for MAC learning")
cls.pg_start()
def create_stream(self, src_if, packet_sizes, packets_per_burst):
"""
Create input packet stream for defined interface.
:param object src_if: Interface to create packet stream for.
:param list packet_sizes: List of required packet sizes.
:param int packets_per_burst: Number of packets in burst.
:return: Stream of packets.
"""
pkts = []
for i in range(0, packets_per_burst):
dst_if = self.flows[src_if][i % 2]
dst_host = random.choice(self.hosts_by_pg_idx[dst_if.sw_if_index])
src_host = random.choice(self.hosts_by_pg_idx[src_if.sw_if_index])
pkt_info = self.create_packet_info(src_if, dst_if)
payload = self.info_to_payload(pkt_info)
p = (Ether(dst=dst_host.mac, src=src_host.mac) /
IP(src=src_host.ip4, dst=dst_host.ip4) /
UDP(sport=1234, dport=1234) /
Raw(payload))
pkt_info.data = p.copy()
if hasattr(src_if, 'sub_if'):
p = src_if.sub_if.add_dot1_layer(p)
size = random.choice(packet_sizes)
self.extend_packet(p, size)
pkts.append(p)
return pkts
def verify_capture(self, pg_if, capture):
"""
Verify captured input packet stream for defined interface.
:param object pg_if: Interface to verify captured packet stream for.
:param list capture: Captured packet stream.
"""
last_info = dict()
for i in self.pg_interfaces:
last_info[i.sw_if_index] = None
dst_sw_if_index = pg_if.sw_if_index
for packet in capture:
payload_info = self.payload_to_info(str(packet[Raw]))
src_sw_if_index = payload_info.src
src_if = None
for ifc in self.pg_interfaces:
if ifc != pg_if:
if ifc.sw_if_index == src_sw_if_index:
src_if = ifc
break
if hasattr(src_if, 'sub_if'):
# Check VLAN tags and Ethernet header
packet = src_if.sub_if.remove_dot1_layer(packet)
self.assertTrue(Dot1Q not in packet)
try:
ip = packet[IP]
udp = packet[UDP]
packet_index = payload_info.index
self.assertEqual(payload_info.dst, dst_sw_if_index)
self.logger.debug("Got packet on port %s: src=%u (id=%u)" %
(pg_if.name, payload_info.src, packet_index))
next_info = self.get_next_packet_info_for_interface2(
payload_info.src, dst_sw_if_index,
last_info[payload_info.src])
last_info[payload_info.src] = next_info
self.assertTrue(next_info is not None)
self.assertEqual(packet_index, next_info.index)
saved_packet = next_info.data
# Check standard fields
self.assertEqual(ip.src, saved_packet[IP].src)
self.assertEqual(ip.dst, saved_packet[IP].dst)
self.assertEqual(udp.sport, saved_packet[UDP].sport)
self.assertEqual(udp.dport, saved_packet[UDP].dport)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
for i in self.pg_interfaces:
remaining_packet = self.get_next_packet_info_for_interface2(
i, dst_sw_if_index, last_info[i.sw_if_index])
self.assertTrue(
remaining_packet is None,
"Port %u: Packet expected from source %u didn't arrive" %
(dst_sw_if_index, i.sw_if_index))
def run_l2bd_test(self, pkts_per_burst):
""" L2BD MAC learning test """
# Create incoming packet streams for packet-generator interfaces
for i in self.pg_interfaces:
packet_sizes = self.sub_if_packet_sizes if hasattr(i, 'sub_if') \
else self.pg_if_packet_sizes
pkts = self.create_stream(i, packet_sizes, pkts_per_burst)
i.add_stream(pkts)
# Enable packet capture and start packet sending
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Verify outgoing packet streams per packet-generator interface
for i in self.pg_interfaces:
capture = i.get_capture()
self.logger.info("Verifying capture on interface %s" % i.name)
self.verify_capture(i, capture)
def test_l2bd_sl(self):
""" L2BD MAC learning single-loop test
Test scenario:
1.config
MAC learning enabled
learn 100 MAC enries
3 interfaces: untagged, dot1q, dot1ad (dot1q used instead of
dot1ad in the first version)
2.sending l2 eth pkts between 3 interface
64B, 512B, 1518B, 9200B (ether_size)
burst of 2 pkts per interface
"""
self.run_l2bd_test(self.sl_pkts_per_burst)
def test_l2bd_dl(self):
""" L2BD MAC learning dual-loop test
Test scenario:
1.config
MAC learning enabled
learn 100 MAC enries
3 interfaces: untagged, dot1q, dot1ad (dot1q used instead of
dot1ad in the first version)
2.sending l2 eth pkts between 3 interface
64B, 512B, 1518B, 9200B (ether_size)
burst of 257 pkts per interface
"""
self.run_l2bd_test(self.dl_pkts_per_burst)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
