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#!/usr/bin/env python
import unittest
import random
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from logging import *
from framework import VppTestCase, VppTestRunner
from util import TestHost
class TestL2xc(VppTestCase):
""" L2XC Test Case """
# Test variables
hosts_nr = 10 # Number of hosts
pkts_per_burst = 257 # Number of packets per burst
@classmethod
def setUpClass(cls):
super(TestL2xc, cls).setUpClass()
def setUp(self):
super(TestL2xc, self).setUp()
# create 4 pg interfaces
self.create_pg_interfaces(range(4))
# packet flows mapping pg0 -> pg1, pg2 -> pg3, etc.
self.flows = dict()
self.flows[self.pg0] = [self.pg1]
self.flows[self.pg1] = [self.pg0]
self.flows[self.pg2] = [self.pg3]
self.flows[self.pg3] = [self.pg2]
# packet sizes
self.pg_if_packet_sizes = [64, 512, 1518, 9018]
self.interfaces = list(self.pg_interfaces)
# Create bi-directional cross-connects between pg0 and pg1
self.vapi.sw_interface_set_l2_xconnect(
self.pg0.sw_if_index, self.pg1.sw_if_index, enable=1)
self.vapi.sw_interface_set_l2_xconnect(
self.pg1.sw_if_index, self.pg0.sw_if_index, enable=1)
# Create bi-directional cross-connects between pg2 and pg3
self.vapi.sw_interface_set_l2_xconnect(
self.pg2.sw_if_index, self.pg3.sw_if_index, enable=1)
self.vapi.sw_interface_set_l2_xconnect(
self.pg3.sw_if_index, self.pg2.sw_if_index, enable=1)
info(self.vapi.cli("show l2patch"))
# mapping between packet-generator index and lists of test hosts
self.hosts_by_pg_idx = dict()
# Create host MAC and IPv4 lists
# self.MY_MACS = dict()
# self.MY_IP4S = dict()
self.create_host_lists(TestL2xc.hosts_nr)
# setup all interfaces
for i in self.interfaces:
i.admin_up()
def tearDown(self):
super(TestL2xc, self).tearDown()
if not self.vpp_dead:
info(self.vapi.cli("show l2patch"))
def create_host_lists(self, count):
""" Method to create required number of MAC and IPv4 addresses.
Create required number of host MAC addresses and distribute them among
interfaces. Create host IPv4 address for every host MAC address too.
:param count: Number of hosts to create MAC and IPv4 addresses for.
Type: int
"""
for pg_if in self.pg_interfaces:
# self.MY_MACS[i.sw_if_index] = []
# self.MY_IP4S[i.sw_if_index] = []
self.hosts_by_pg_idx[pg_if.sw_if_index] = []
hosts = self.hosts_by_pg_idx[pg_if.sw_if_index]
for j in range(0, count):
host = TestHost(
"00:00:00:ff:%02x:%02x" % (pg_if.sw_if_index, j),
"172.17.1%02x.%u" % (pg_if.sw_if_index, j))
hosts.append(host)
def create_stream(self, src_if, packet_sizes):
pkts = []
for i in range(0, TestL2xc.pkts_per_burst):
dst_if = self.flows[src_if][0]
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.sw_if_index, dst_if.sw_if_index)
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()
size = packet_sizes[(i / 2) % len(packet_sizes)]
self.extend_packet(p, size)
pkts.append(p)
return pkts
def verify_capture(self, pg_if, capture):
last_info = dict()
for i in self.interfaces:
last_info[i.sw_if_index] = None
dst_sw_if_index = pg_if.sw_if_index
for packet in capture:
try:
ip = packet[IP]
udp = packet[UDP]
payload_info = self.payload_to_info(str(packet[Raw]))
packet_index = payload_info.index
self.assertEqual(payload_info.dst, dst_sw_if_index)
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:
error("Unexpected or invalid packet:")
packet.show()
raise
for i in self.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 test_l2xc(self):
""" L2XC test
Test scenario:
1.config
2 pairs of 2 interfaces, l2xconnected
2.sending l2 eth packets between 4 interfaces
64B, 512B, 1518B, 9018B (ether_size)
burst of packets per interface
"""
# Create incoming packet streams for packet-generator interfaces
for i in self.interfaces:
pkts = self.create_stream(i, self.pg_if_packet_sizes)
i.add_stream(pkts)
# Enable packet capturing 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()
info("Verifying capture on interface %s" % i.name)
self.verify_capture(i, capture)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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