test/test_ip_ecmp.py - fdio/vpp - Gitiles

 #!/usr/bin/env python3

 import unittest
 import random
 from ipaddress import IPv4Address, IPv6Address, AddressValueError

 from framework import VppTestCase
 from asfframework import VppTestRunner
 from util import ppp

 from scapy.packet import Raw
 from scapy.layers.l2 import Ether
 from scapy.layers.inet import IP, UDP
 from scapy.layers.inet6 import IPv6
 from vpp_ip_route import VppIpRoute, VppRoutePath

 try:
     text_type = unicode
 except NameError:
     text_type = str

 #
 # The number of packets to sent.
 #
 N_PKTS_IN_STREAM = 300


 class TestECMP(VppTestCase):
     """Equal-cost multi-path routing 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.
         """
         super(TestECMP, cls).setUpClass()

         # create 4 pg interfaces
         cls.create_pg_interfaces(range(4))

         # packet sizes to test
         cls.pg_if_packet_sizes = [64, 1500, 9018]

         # setup interfaces
         for i in cls.pg_interfaces:
             i.admin_up()
             i.generate_remote_hosts(5)
             i.config_ip4()
             i.resolve_arp()
             i.configure_ipv4_neighbors()
             i.config_ip6()
             i.resolve_ndp()
             i.configure_ipv6_neighbors()

     @classmethod
     def tearDownClass(cls):
         if not cls.vpp_dead:
             for i in cls.pg_interfaces:
                 i.unconfig_ip4()
                 i.unconfig_ip6()
                 i.admin_down()

         super(TestECMP, cls).tearDownClass()

     def setUp(self):
         super(TestECMP, self).setUp()
         self.reset_packet_infos()

     def tearDown(self):
         """
         Show various debug prints after each test.
         """
         super(TestECMP, self).tearDown()

     def show_commands_at_teardown(self):
         self.logger.info(self.vapi.ppcli("show ip4 neighbors"))
         self.logger.info(self.vapi.ppcli("show ip6 neighbors"))

     def get_ip_address(self, ip_addr_start, ip_prefix_len):
         """

         :param str ip_addr_start: Starting IPv4 or IPv6 address.
         :param int ip_prefix_len: IP address prefix length.
         :return: Random IPv4 or IPv6 address from required range.
         """
         try:
             ip_addr = IPv4Address(text_type(ip_addr_start))
             ip_max_len = 32
         except (AttributeError, AddressValueError):
             ip_addr = IPv6Address(text_type(ip_addr_start))
             ip_max_len = 128

         return str(ip_addr + random.randint(0, 2 ** (ip_max_len - ip_prefix_len) - 2))

     def create_stream(
         self, src_if, src_ip_start, dst_ip_start, ip_prefix_len, packet_sizes, ip_l=IP
     ):
         """Create input packet stream for defined interfaces.

         :param VppInterface src_if: Source Interface for packet stream.
         :param str src_ip_start: Starting source IPv4 or IPv6 address.
         :param str dst_ip_start: Starting destination IPv4 or IPv6 address.
         :param int ip_prefix_len: IP address prefix length.
         :param list packet_sizes: packet size to test.
         :param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
         """
         pkts = []
         for i in range(0, N_PKTS_IN_STREAM):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
             src_ip = self.get_ip_address(src_ip_start, ip_prefix_len)
             dst_ip = self.get_ip_address(dst_ip_start, ip_prefix_len)
             p = (
                 Ether(dst=src_if.local_mac, src=src_if.remote_mac)
                 / ip_l(src=src_ip, dst=dst_ip)
                 / UDP(sport=1234, dport=1234)
                 / Raw(payload)
             )
             info.data = p.copy()
             size = random.choice(packet_sizes)
             self.extend_packet(p, size)
             pkts.append(p)
         return pkts

     def verify_capture(self, rx_if, capture, ip_l=IP):
         """Verify captured input packet stream for defined interface.

         :param VppInterface rx_if: Interface to verify captured packet stream.
         :param list capture: Captured packet stream.
         :param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
         """
         self.logger.info("Verifying capture on interface %s" % rx_if.name)

         count = 0
         host_counters = {}
         for host_mac in rx_if._hosts_by_mac:
             host_counters[host_mac] = 0

         for packet in capture:
             try:
                 ip_received = packet[ip_l]
                 payload_info = self.payload_to_info(packet[Raw])
                 packet_index = payload_info.index
                 ip_sent = self._packet_infos[packet_index].data[ip_l]
                 self.logger.debug(
                     "Got packet on port %s: src=%u (id=%u)"
                     % (rx_if.name, payload_info.src, packet_index)
                 )
                 # Check standard fields
                 self.assertIn(
                     packet.dst,
                     rx_if._hosts_by_mac,
                     "Destination MAC address %s shouldn't be routed "
                     "via interface %s" % (packet.dst, rx_if.name),
                 )
                 self.assertEqual(packet.src, rx_if.local_mac)
                 self.assertEqual(ip_received.src, ip_sent.src)
                 self.assertEqual(ip_received.dst, ip_sent.dst)
                 host_counters[packet.dst] += 1
                 self._packet_infos.pop(packet_index)

             except:
                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
                 raise

         # We expect packet routed via all host of pg interface
         for host_mac in host_counters:
             nr = host_counters[host_mac]
             self.assertNotEqual(nr, 0, "No packet routed via host %s" % host_mac)
             self.logger.info(
                 "%u packets routed via host %s of %s interface"
                 % (nr, host_mac, rx_if.name)
             )
             count += nr
         self.logger.info(
             "Total amount of %u packets routed via %s interface" % (count, rx_if.name)
         )

         return count

     def create_ip_routes(self, dst_ip_net, dst_prefix_len, is_ipv6=0):
         """
         Create IP routes for defined destination IP network.

         :param str dst_ip_net: Destination IP network.
         :param int dst_prefix_len: IP address prefix length.
         :param int is_ipv6: 0 if an ip4 route, else ip6
         """

         paths = []
         for pg_if in self.pg_interfaces[1:]:
             for nh_host in pg_if.remote_hosts:
                 nh_host_ip = nh_host.ip4 if is_ipv6 == 0 else nh_host.ip6
                 paths.append(VppRoutePath(nh_host_ip, pg_if.sw_if_index))

         rip = VppIpRoute(self, dst_ip_net, dst_prefix_len, paths)
         rip.add_vpp_config()
         self.logger.info("Route via %s on %s created" % (nh_host_ip, pg_if.name))

         self.logger.debug(self.vapi.ppcli("show ip fib"))
         self.logger.debug(self.vapi.ppcli("show ip6 fib"))

     def test_ip_ecmp(self):
         """IP equal-cost multi-path routing test"""

         src_ip_net = "16.0.0.1"
         dst_ip_net = "32.0.0.1"
         ip_prefix_len = 24

         self.create_ip_routes(dst_ip_net, ip_prefix_len)

         pkts = self.create_stream(
             self.pg0, src_ip_net, dst_ip_net, ip_prefix_len, self.pg_if_packet_sizes
         )
         self.pg0.add_stream(pkts)

         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()

         # We expect packets on pg1, pg2 and pg3, but not on pg0
         rx_count = 0
         for pg_if in self.pg_interfaces[1:]:
             capture = pg_if._get_capture(timeout=1)
             self.assertNotEqual(
                 len(capture), 0, msg="No packets captured on %s" % pg_if.name
             )
             rx_count += self.verify_capture(pg_if, capture)
         self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

         # Check that all packets were forwarded via pg1, pg2 and pg3
         self.assertEqual(rx_count, len(pkts))

     def test_ip6_ecmp(self):
         """IPv6 equal-cost multi-path routing test"""

         src_ip_net = "3ffe:51::1"
         dst_ip_net = "3ffe:71::1"
         ip_prefix_len = 64

         self.create_ip_routes(dst_ip_net, ip_prefix_len, is_ipv6=1)

         pkts = self.create_stream(
             self.pg0,
             src_ip_net,
             dst_ip_net,
             ip_prefix_len,
             self.pg_if_packet_sizes,
             ip_l=IPv6,
         )
         self.pg0.add_stream(pkts)

         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()

         # We expect packets on pg1, pg2 and pg3, but not on pg0
         rx_count = 0
         for pg_if in self.pg_interfaces[1:]:
             capture = pg_if._get_capture(timeout=1)
             self.assertNotEqual(
                 len(capture), 0, msg="No packets captured on %s" % pg_if.name
             )
             rx_count += self.verify_capture(pg_if, capture, ip_l=IPv6)
         self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

         # Check that all packets were forwarded via pg1, pg2 and pg3
         self.assertEqual(rx_count, len(pkts))


 if __name__ == "__main__":
     unittest.main(testRunner=VppTestRunner)
	#!/usr/bin/env python3

	import unittest
	import random
	from ipaddress import IPv4Address, IPv6Address, AddressValueError

	from framework import VppTestCase
	from asfframework import VppTestRunner
	from util import ppp

	from scapy.packet import Raw
	from scapy.layers.l2 import Ether
	from scapy.layers.inet import IP, UDP
	from scapy.layers.inet6 import IPv6
	from vpp_ip_route import VppIpRoute, VppRoutePath

	try:
	text_type = unicode
	except NameError:
	text_type = str

	#
	# The number of packets to sent.
	#
	N_PKTS_IN_STREAM = 300


	class TestECMP(VppTestCase):
	"""Equal-cost multi-path routing 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.
	"""
	super(TestECMP, cls).setUpClass()

	# create 4 pg interfaces
	cls.create_pg_interfaces(range(4))

	# packet sizes to test
	cls.pg_if_packet_sizes = [64, 1500, 9018]

	# setup interfaces
	for i in cls.pg_interfaces:
	i.admin_up()
	i.generate_remote_hosts(5)
	i.config_ip4()
	i.resolve_arp()
	i.configure_ipv4_neighbors()
	i.config_ip6()
	i.resolve_ndp()
	i.configure_ipv6_neighbors()

	@classmethod
	def tearDownClass(cls):
	if not cls.vpp_dead:
	for i in cls.pg_interfaces:
	i.unconfig_ip4()
	i.unconfig_ip6()
	i.admin_down()

	super(TestECMP, cls).tearDownClass()

	def setUp(self):
	super(TestECMP, self).setUp()
	self.reset_packet_infos()

	def tearDown(self):
	"""
	Show various debug prints after each test.
	"""
	super(TestECMP, self).tearDown()

	def show_commands_at_teardown(self):
	self.logger.info(self.vapi.ppcli("show ip4 neighbors"))
	self.logger.info(self.vapi.ppcli("show ip6 neighbors"))

	def get_ip_address(self, ip_addr_start, ip_prefix_len):
	"""

	:param str ip_addr_start: Starting IPv4 or IPv6 address.
	:param int ip_prefix_len: IP address prefix length.
	:return: Random IPv4 or IPv6 address from required range.
	"""
	try:
	ip_addr = IPv4Address(text_type(ip_addr_start))
	ip_max_len = 32
	except (AttributeError, AddressValueError):
	ip_addr = IPv6Address(text_type(ip_addr_start))
	ip_max_len = 128

	return str(ip_addr + random.randint(0, 2 ** (ip_max_len - ip_prefix_len) - 2))

	def create_stream(
	self, src_if, src_ip_start, dst_ip_start, ip_prefix_len, packet_sizes, ip_l=IP
	):
	"""Create input packet stream for defined interfaces.

	:param VppInterface src_if: Source Interface for packet stream.
	:param str src_ip_start: Starting source IPv4 or IPv6 address.
	:param str dst_ip_start: Starting destination IPv4 or IPv6 address.
	:param int ip_prefix_len: IP address prefix length.
	:param list packet_sizes: packet size to test.
	:param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
	"""
	pkts = []
	for i in range(0, N_PKTS_IN_STREAM):
	info = self.create_packet_info(src_if, src_if)
	payload = self.info_to_payload(info)
	src_ip = self.get_ip_address(src_ip_start, ip_prefix_len)
	dst_ip = self.get_ip_address(dst_ip_start, ip_prefix_len)
	p = (
	Ether(dst=src_if.local_mac, src=src_if.remote_mac)
	/ ip_l(src=src_ip, dst=dst_ip)
	/ UDP(sport=1234, dport=1234)
	/ Raw(payload)
	)
	info.data = p.copy()
	size = random.choice(packet_sizes)
	self.extend_packet(p, size)
	pkts.append(p)
	return pkts

	def verify_capture(self, rx_if, capture, ip_l=IP):
	"""Verify captured input packet stream for defined interface.

	:param VppInterface rx_if: Interface to verify captured packet stream.
	:param list capture: Captured packet stream.
	:param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
	"""
	self.logger.info("Verifying capture on interface %s" % rx_if.name)

	count = 0
	host_counters = {}
	for host_mac in rx_if._hosts_by_mac:
	host_counters[host_mac] = 0

	for packet in capture:
	try:
	ip_received = packet[ip_l]
	payload_info = self.payload_to_info(packet[Raw])
	packet_index = payload_info.index
	ip_sent = self._packet_infos[packet_index].data[ip_l]
	self.logger.debug(
	"Got packet on port %s: src=%u (id=%u)"
	% (rx_if.name, payload_info.src, packet_index)
	)
	# Check standard fields
	self.assertIn(
	packet.dst,
	rx_if._hosts_by_mac,
	"Destination MAC address %s shouldn't be routed "
	"via interface %s" % (packet.dst, rx_if.name),
	)
	self.assertEqual(packet.src, rx_if.local_mac)
	self.assertEqual(ip_received.src, ip_sent.src)
	self.assertEqual(ip_received.dst, ip_sent.dst)
	host_counters[packet.dst] += 1
	self._packet_infos.pop(packet_index)

	except:
	self.logger.error(ppp("Unexpected or invalid packet:", packet))
	raise

	# We expect packet routed via all host of pg interface
	for host_mac in host_counters:
	nr = host_counters[host_mac]
	self.assertNotEqual(nr, 0, "No packet routed via host %s" % host_mac)
	self.logger.info(
	"%u packets routed via host %s of %s interface"
	% (nr, host_mac, rx_if.name)
	)
	count += nr
	self.logger.info(
	"Total amount of %u packets routed via %s interface" % (count, rx_if.name)
	)

	return count

	def create_ip_routes(self, dst_ip_net, dst_prefix_len, is_ipv6=0):
	"""
	Create IP routes for defined destination IP network.

	:param str dst_ip_net: Destination IP network.
	:param int dst_prefix_len: IP address prefix length.
	:param int is_ipv6: 0 if an ip4 route, else ip6
	"""

	paths = []
	for pg_if in self.pg_interfaces[1:]:
	for nh_host in pg_if.remote_hosts:
	nh_host_ip = nh_host.ip4 if is_ipv6 == 0 else nh_host.ip6
	paths.append(VppRoutePath(nh_host_ip, pg_if.sw_if_index))

	rip = VppIpRoute(self, dst_ip_net, dst_prefix_len, paths)
	rip.add_vpp_config()
	self.logger.info("Route via %s on %s created" % (nh_host_ip, pg_if.name))

	self.logger.debug(self.vapi.ppcli("show ip fib"))
	self.logger.debug(self.vapi.ppcli("show ip6 fib"))

	def test_ip_ecmp(self):
	"""IP equal-cost multi-path routing test"""

	src_ip_net = "16.0.0.1"
	dst_ip_net = "32.0.0.1"
	ip_prefix_len = 24

	self.create_ip_routes(dst_ip_net, ip_prefix_len)

	pkts = self.create_stream(
	self.pg0, src_ip_net, dst_ip_net, ip_prefix_len, self.pg_if_packet_sizes
	)
	self.pg0.add_stream(pkts)

	self.pg_enable_capture(self.pg_interfaces)
	self.pg_start()

	# We expect packets on pg1, pg2 and pg3, but not on pg0
	rx_count = 0
	for pg_if in self.pg_interfaces[1:]:
	capture = pg_if._get_capture(timeout=1)
	self.assertNotEqual(
	len(capture), 0, msg="No packets captured on %s" % pg_if.name
	)
	rx_count += self.verify_capture(pg_if, capture)
	self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

	# Check that all packets were forwarded via pg1, pg2 and pg3
	self.assertEqual(rx_count, len(pkts))

	def test_ip6_ecmp(self):
	"""IPv6 equal-cost multi-path routing test"""

	src_ip_net = "3ffe:51::1"
	dst_ip_net = "3ffe:71::1"
	ip_prefix_len = 64

	self.create_ip_routes(dst_ip_net, ip_prefix_len, is_ipv6=1)

	pkts = self.create_stream(
	self.pg0,
	src_ip_net,
	dst_ip_net,
	ip_prefix_len,
	self.pg_if_packet_sizes,
	ip_l=IPv6,
	)
	self.pg0.add_stream(pkts)

	self.pg_enable_capture(self.pg_interfaces)
	self.pg_start()

	# We expect packets on pg1, pg2 and pg3, but not on pg0
	rx_count = 0
	for pg_if in self.pg_interfaces[1:]:
	capture = pg_if._get_capture(timeout=1)
	self.assertNotEqual(
	len(capture), 0, msg="No packets captured on %s" % pg_if.name
	)
	rx_count += self.verify_capture(pg_if, capture, ip_l=IPv6)
	self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

	# Check that all packets were forwarded via pg1, pg2 and pg3
	self.assertEqual(rx_count, len(pkts))


	if __name__ == "__main__":
	unittest.main(testRunner=VppTestRunner)