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-rw-r--r--test/test_lb.py216
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diff --git a/test/test_lb.py b/test/test_lb.py
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+import socket
+
+from scapy.layers.inet import IP, UDP
+from scapy.layers.inet6 import IPv6
+from scapy.layers.l2 import Ether, GRE
+from scapy.packet import Raw
+
+from framework import VppTestCase
+from util import ppp
+
+""" TestLB is a subclass of VPPTestCase classes.
+
+ TestLB class defines Load Balancer test cases for:
+ - IP4 to GRE4 encap
+ - IP4 to GRE6 encap
+ - IP6 to GRE4 encap
+ - IP6 to GRE6 encap
+
+ As stated in comments below, GRE has issues with IPv6.
+ All test cases involving IPv6 are executed, but
+ received packets are not parsed and checked.
+
+"""
+
+
+class TestLB(VppTestCase):
+ """ Load Balancer Test Case """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestLB, cls).setUpClass()
+
+ cls.ass = range(5)
+ cls.packets = range(100)
+
+ try:
+ cls.create_pg_interfaces(range(2))
+ cls.interfaces = list(cls.pg_interfaces)
+
+ for i in cls.interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.config_ip6()
+ i.disable_ipv6_ra()
+ i.resolve_arp()
+ i.resolve_ndp()
+ dst4 = socket.inet_pton(socket.AF_INET, "10.0.0.0")
+ dst6 = socket.inet_pton(socket.AF_INET6, "2002::")
+ cls.vapi.ip_add_del_route(dst4, 24, cls.pg1.remote_ip4n)
+ cls.vapi.ip_add_del_route(dst6, 16, cls.pg1.remote_ip6n, is_ipv6=1)
+ cls.vapi.cli("lb conf ip4-src-address 39.40.41.42")
+ cls.vapi.cli("lb conf ip6-src-address 2004::1")
+ except Exception:
+ super(TestLB, cls).tearDownClass()
+ raise
+
+ def tearDown(self):
+ super(TestLB, self).tearDown()
+ if not self.vpp_dead:
+ self.logger.info(self.vapi.cli("show lb vip verbose"))
+
+ def getIPv4Flow(self, id):
+ return (IP(dst="90.0.%u.%u" % (id / 255, id % 255),
+ src="40.0.%u.%u" % (id / 255, id % 255)) /
+ UDP(sport=10000 + id, dport=20000 + id))
+
+ def getIPv6Flow(self, id):
+ return (IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) /
+ UDP(sport=10000 + id, dport=20000 + id))
+
+ def generatePackets(self, src_if, isv4):
+ self.reset_packet_infos()
+ pkts = []
+ for pktid in self.packets:
+ info = self.create_packet_info(src_if, self.pg1)
+ payload = self.info_to_payload(info)
+ ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid)
+ packet = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+ ip /
+ Raw(payload))
+ self.extend_packet(packet, 128)
+ info.data = packet.copy()
+ pkts.append(packet)
+ return pkts
+
+ def checkInner(self, gre, isv4):
+ IPver = IP if isv4 else IPv6
+ self.assertEqual(gre.proto, 0x0800 if isv4 else 0x86DD)
+ self.assertEqual(gre.flags, 0)
+ self.assertEqual(gre.version, 0)
+ inner = IPver(str(gre.payload))
+ payload_info = self.payload_to_info(str(inner[Raw]))
+ self.info = self.packet_infos[payload_info.index]
+ self.assertEqual(payload_info.src, self.pg0.sw_if_index)
+ self.assertEqual(str(inner), str(self.info.data[IPver]))
+
+ def checkCapture(self, gre4, isv4):
+ self.pg0.assert_nothing_captured()
+ out = self.pg1.get_capture(len(self.packets))
+
+ load = [0] * len(self.ass)
+ self.info = None
+ for p in out:
+ try:
+ asid = 0
+ gre = None
+ if gre4:
+ ip = p[IP]
+ asid = int(ip.dst.split(".")[3])
+ self.assertEqual(ip.version, 4)
+ self.assertEqual(ip.flags, 0)
+ self.assertEqual(ip.src, "39.40.41.42")
+ self.assertEqual(ip.dst, "10.0.0.%u" % asid)
+ self.assertEqual(ip.proto, 47)
+ self.assertEqual(len(ip.options), 0)
+ self.assertGreaterEqual(ip.ttl, 64)
+ gre = p[GRE]
+ else:
+ ip = p[IPv6]
+ asid = ip.dst.split(":")
+ asid = asid[len(asid) - 1]
+ asid = 0 if asid == "" else int(asid)
+ self.assertEqual(ip.version, 6)
+ self.assertEqual(ip.tc, 0)
+ self.assertEqual(ip.fl, 0)
+ self.assertEqual(ip.src, "2004::1")
+ self.assertEqual(
+ socket.inet_pton(socket.AF_INET6, ip.dst),
+ socket.inet_pton(socket.AF_INET6, "2002::%u" % asid)
+ )
+ self.assertEqual(ip.nh, 47)
+ self.assertGreaterEqual(ip.hlim, 64)
+ # self.assertEqual(len(ip.options), 0)
+ gre = GRE(str(p[IPv6].payload))
+ self.checkInner(gre, isv4)
+ load[asid] += 1
+ except:
+ self.logger.error(ppp("Unexpected or invalid packet:", p))
+ raise
+
+ # This is just to roughly check that the balancing algorithm
+ # is not completly biased.
+ for asid in self.ass:
+ if load[asid] < len(self.packets) / (len(self.ass) * 2):
+ self.log(
+ "ASS is not balanced: load[%d] = %d" % (asid, load[asid]))
+ raise Exception("Load Balancer algorithm is biased")
+
+ def test_lb_ip4_gre4(self):
+ """ Load Balancer IP4 GRE4 """
+ try:
+ self.vapi.cli("lb vip 90.0.0.0/8 encap gre4")
+ for asid in self.ass:
+ self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
+
+ self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ self.checkCapture(gre4=True, isv4=True)
+
+ finally:
+ for asid in self.ass:
+ self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
+ self.vapi.cli("lb vip 90.0.0.0/8 encap gre4 del")
+
+ def test_lb_ip6_gre4(self):
+ """ Load Balancer IP6 GRE4 """
+
+ try:
+ self.vapi.cli("lb vip 2001::/16 encap gre4")
+ for asid in self.ass:
+ self.vapi.cli("lb as 2001::/16 10.0.0.%u" % (asid))
+
+ self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.checkCapture(gre4=True, isv4=False)
+ finally:
+ for asid in self.ass:
+ self.vapi.cli("lb as 2001::/16 10.0.0.%u del" % (asid))
+ self.vapi.cli("lb vip 2001::/16 encap gre4 del")
+
+ def test_lb_ip4_gre6(self):
+ """ Load Balancer IP4 GRE6 """
+ try:
+ self.vapi.cli("lb vip 90.0.0.0/8 encap gre6")
+ for asid in self.ass:
+ self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
+
+ self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.checkCapture(gre4=False, isv4=True)
+ finally:
+ for asid in self.ass:
+ self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
+ self.vapi.cli("lb vip 90.0.0.0/8 encap gre6 del")
+
+ def test_lb_ip6_gre6(self):
+ """ Load Balancer IP6 GRE6 """
+ try:
+ self.vapi.cli("lb vip 2001::/16 encap gre6")
+ for asid in self.ass:
+ self.vapi.cli("lb as 2001::/16 2002::%u" % (asid))
+
+ self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.checkCapture(gre4=False, isv4=False)
+ finally:
+ for asid in self.ass:
+ self.vapi.cli("lb as 2001::/16 2002::%u del" % (asid))
+ self.vapi.cli("lb vip 2001::/16 encap gre6 del")