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#!/usr/bin/env python
import unittest
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from framework import VppTestCase, VppTestRunner
from util import Host, ppp
class TestSpan(VppTestCase):
""" SPAN Test Case """
# Test variables
hosts_nr = 10 # Number of hosts
pkts_per_burst = 257 # Number of packets per burst
@classmethod
def setUpClass(cls):
super(TestSpan, cls).setUpClass()
def setUp(self):
super(TestSpan, self).setUp()
# create 3 pg interfaces
self.create_pg_interfaces(range(3))
# packet flows mapping pg0 -> pg1, pg2 -> pg3, etc.
self.flows = dict()
self.flows[self.pg0] = [self.pg1]
# packet sizes
self.pg_if_packet_sizes = [64, 512] # , 1518, 9018]
self.interfaces = list(self.pg_interfaces)
# Create host MAC and IPv4 lists
# self.MY_MACS = dict()
# self.MY_IP4S = dict()
self.create_host_lists(TestSpan.hosts_nr)
# 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)
# setup all interfaces
for i in self.interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
# Enable SPAN on pg0 (mirrored to pg2)
self.vapi.sw_interface_span_enable_disable(
self.pg0.sw_if_index, self.pg2.sw_if_index)
def tearDown(self):
super(TestSpan, self).tearDown()
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.
"""
# mapping between packet-generator index and lists of test hosts
self.hosts_by_pg_idx = dict()
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 = Host(
"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, TestSpan.pkts_per_burst):
dst_if = self.flows[src_if][0]
pkt_info = self.create_packet_info(src_if, dst_if)
payload = self.info_to_payload(pkt_info)
p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
IP(src=src_if.remote_ip4, dst=dst_if.remote_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, dst_if, capture_pg1, capture_pg2):
last_info = dict()
for i in self.interfaces:
last_info[i.sw_if_index] = None
dst_sw_if_index = dst_if.sw_if_index
self.assertEqual(
len(capture_pg1),
len(capture_pg2),
"Different number of outgoing and mirrored packets : %u != %u" %
(len(capture_pg1),
len(capture_pg2)))
for pkt_pg1, pkt_pg2 in zip(capture_pg1, capture_pg2):
try:
ip1 = pkt_pg1[IP]
udp1 = pkt_pg1[UDP]
raw1 = pkt_pg1[Raw]
if pkt_pg1[Ether] != pkt_pg2[Ether]:
self.logger.error("Different ethernet header of "
"outgoing and mirrored packet")
raise
if ip1 != pkt_pg2[IP]:
self.logger.error(
"Different ip header of outgoing and mirrored packet")
raise
if udp1 != pkt_pg2[UDP]:
self.logger.error(
"Different udp header of outgoing and mirrored packet")
raise
if raw1 != pkt_pg2[Raw]:
self.logger.error(
"Different raw data of outgoing and mirrored packet")
raise
payload_info = self.payload_to_info(str(raw1))
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)" %
(dst_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(ip1.src, saved_packet[IP].src)
self.assertEqual(ip1.dst, saved_packet[IP].dst)
self.assertEqual(udp1.sport, saved_packet[UDP].sport)
self.assertEqual(udp1.dport, saved_packet[UDP].dport)
except:
self.logger.error("Unexpected or invalid packets:")
self.logger.error(ppp("pg1 packet:", pkt_pg1))
self.logger.error(ppp("pg2 packet:", pkt_pg2))
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_span(self):
""" SPAN test
Test scenario:
1. config
3 interfaces, pg0 l2xconnected with pg1
2. sending l2 eth packets between 2 interfaces (pg0, pg1) and
mirrored to pg2
64B, 512B, 1518B, 9018B (ether_size)
burst of packets per interface
"""
# Create incoming packet streams for packet-generator interfaces
pkts = self.create_stream(self.pg0, self.pg_if_packet_sizes)
self.pg0.add_stream(pkts)
# Enable packet capturing and start packet sending
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Verify packets outgoing packet streams on mirrored interface (pg2)
self.logger.info("Verifying capture on interfaces %s and %s" %
(self.pg1.name, self.pg2.name))
pg2_expected = self.get_packet_count_for_if_idx(self.pg1.sw_if_index)
self.verify_capture(
self.pg1,
self.pg1.get_capture(),
self.pg2.get_capture(pg2_expected))
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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