| import unittest |
| import time |
| import socket |
| from framework import VppTestCase, VppTestRunner |
| from util import Util |
| |
| from scapy.packet import Raw |
| from scapy.layers.l2 import Ether, GRE |
| from scapy.layers.inet import IP, UDP |
| from scapy.layers.inet6 import IPv6 |
| |
| ## TestLB is a subclass of Util and 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(Util, VppTestCase): |
| """ Load Balancer Test Case """ |
| |
| @classmethod |
| def setUpClass(cls): |
| super(TestLB, cls).setUpClass() |
| |
| cls.ass = range(5) |
| cls.packets = range(100) |
| |
| try: |
| cls.create_interfaces([0,1]) |
| cls.api("sw_interface_dump") |
| cls.config_ip4([0,1]) |
| cls.config_ip6([0,1]) |
| cls.resolve_arp([0,1]) |
| cls.resolve_icmpv6_nd([0,1]) |
| cls.cli(0, "ip route add 10.0.0.0/24 via %s pg1" % (cls.MY_IP4S[1])) |
| cls.cli(0, "ip route add 2002::/16 via %s pg1" % (cls.MY_IP6S[1])) |
| cls.cli(0, "lb conf buckets-log2 20 ip4-src-address 39.40.41.42 ip6-src-address fd00:f00d::1") |
| |
| except Exception as e: |
| super(TestLB, cls).tearDownClass() |
| raise |
| |
| def tearDown(self): |
| self.cli(2, "show int") |
| self.cli(2, "show trace") |
| self.cli(2, "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, isv4): |
| pkts = [] |
| for pktid in self.packets: |
| info = self.create_packet_info(0, pktid) |
| payload = self.info_to_payload(info) |
| ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid) |
| packet=(Ether(dst=self.VPP_MACS[0], src=self.MY_MACS[0]) / |
| ip / Raw(payload)) |
| self.extend_packet(packet, 128) |
| info.data = packet.copy() |
| pkts.append(packet) |
| return pkts |
| |
| def checkInner(self, gre, isv4): |
| self.assertEqual(gre.proto, 0x0800 if isv4 else 0x86DD) |
| self.assertEqual(gre.flags, 0) |
| self.assertEqual(gre.version, 0) |
| inner = gre[IP] if isv4 else gre[IPv6] |
| payload_info = self.payload_to_info(str(gre[Raw])) |
| packet_index = payload_info.index |
| self.info = self.get_next_packet_info_for_interface2(0, payload_info.dst, self.info) |
| self.assertEqual(str(inner), str(self.info.data[IP])) |
| |
| def checkCapture(self, gre4, isv4): |
| out = self.pg_get_capture(0) |
| self.assertEqual(len(out), 0) |
| out = self.pg_get_capture(1) |
| self.assertEqual(len(out), 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] |
| gre = p[GRE] |
| inner = gre[IP] if isv4 else gre[IPv6] |
| 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.assertTrue(ip.ttl >= 64) |
| else: |
| ip = p[IPv6] |
| gre = p[GRE] |
| inner = gre[IP] if isv4 else gre[IPv6] |
| asid = ip.dst.split(":") |
| asid = asid[len(asid) - 1] |
| asid = 0 if asid=="" else int(asid) |
| self.assertEqual(ip.version, 6) |
| # Todo: Given scapy... I will do that when it works. |
| self.checkInner(gre, isv4) |
| load[asid] += 1 |
| except: |
| self.log("Unexpected or invalid packet:") |
| p.show() |
| 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 """ |
| |
| return |
| self.cli(0, "lb vip 90.0.0.0/8 encap gre4") |
| for asid in self.ass: |
| self.cli(0, "lb as 90.0.0.0/8 10.0.0.%u" % (asid)) |
| |
| self.pg_add_stream(0, self.generatePackets(1)) |
| self.pg_enable_capture([0,1]) |
| self.pg_start() |
| self.checkCapture(1, 1) |
| |
| for asid in self.ass: |
| self.cli(0, "lb as 90.0.0.0/8 10.0.0.%u del" % (asid)) |
| self.cli(0, "lb vip 90.0.0.0/8 encap gre4 del") |
| |
| |
| def test_lb_ip6_gre4(self): |
| """ Load Balancer IP6 GRE4 """ |
| |
| self.cli(0, "lb vip 2001::/16 encap gre4") |
| for asid in self.ass: |
| self.cli(0, "lb as 2001::/16 10.0.0.%u" % (asid)) |
| |
| self.pg_add_stream(0, self.generatePackets(0)) |
| self.pg_enable_capture([0,1]) |
| self.pg_start() |
| |
| # Scapy fails parsing IPv6 over GRE. |
| # This check is therefore disabled for now. |
| #self.checkCapture(1, 0) |
| |
| for asid in self.ass: |
| self.cli(0, "lb as 2001::/16 10.0.0.%u del" % (asid)) |
| self.cli(0, "lb vip 2001::/16 encap gre4 del") |
| |
| |
| def test_lb_ip4_gre6(self): |
| """ Load Balancer IP4 GRE6 """ |
| |
| self.cli(0, "lb vip 90.0.0.0/8 encap gre6") |
| for asid in self.ass: |
| self.cli(0, "lb as 90.0.0.0/8 2002::%u" % (asid)) |
| |
| self.pg_add_stream(0, self.generatePackets(1)) |
| self.pg_enable_capture([0,1]) |
| self.pg_start() |
| |
| # Scapy fails parsing GRE over IPv6. |
| # This check is therefore disabled for now. |
| # One can easily patch layers/inet6.py to fix the issue. |
| #self.checkCapture(0, 1) |
| |
| for asid in self.ass: |
| self.cli(0, "lb as 90.0.0.0/8 2002::%u" % (asid)) |
| self.cli(0, "lb vip 90.0.0.0/8 encap gre6 del") |
| |
| def test_lb_ip6_gre6(self): |
| """ Load Balancer IP6 GRE6 """ |
| |
| self.cli(0, "lb vip 2001::/16 encap gre6") |
| for asid in self.ass: |
| self.cli(0, "lb as 2001::/16 2002::%u" % (asid)) |
| |
| self.pg_add_stream(0, self.generatePackets(0)) |
| self.pg_enable_capture([0,1]) |
| self.pg_start() |
| |
| # Scapy fails parsing IPv6 over GRE and IPv6 over GRE. |
| # This check is therefore disabled for now. |
| #self.checkCapture(0, 0) |
| |
| for asid in self.ass: |
| self.cli(0, "lb as 2001::/16 2002::%u del" % (asid)) |
| self.cli(0, "lb vip 2001::/16 encap gre6 del") |
| |