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import socket
import scapy.compat
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 scapy.data import IP_PROTOS
from framework import VppTestCase
from util import ppp
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_ip import INVALID_INDEX
from config import config
import unittest
""" TestLB is a subclass of VPPTestCase classes.
TestLB class defines Load Balancer test cases for:
- IP4 to GRE4 encap on per-port vip case
- IP4 to GRE6 encap on per-port vip case
- IP6 to GRE4 encap on per-port vip case
- IP6 to GRE6 encap on per-port vip case
- IP4 to L3DSR encap on vip case
- IP4 to L3DSR encap on per-port vip case
- IP4 to L3DSR encap on per-port vip with src_ip_sticky case
- IP4 to NAT4 encap on per-port vip case
- IP6 to NAT6 encap on per-port vip case
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.
"""
@unittest.skipIf("lb" in config.excluded_plugins, "Exclude LB plugin tests")
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 = VppIpRoute(
cls,
"10.0.0.0",
24,
[VppRoutePath(cls.pg1.remote_ip4, INVALID_INDEX)],
register=False,
)
dst4.add_vpp_config()
dst6 = VppIpRoute(
cls,
"2002::",
16,
[VppRoutePath(cls.pg1.remote_ip6, INVALID_INDEX)],
register=False,
)
dst6.add_vpp_config()
cls.vapi.lb_conf(ip4_src_address="39.40.41.42", ip6_src_address="2004::1")
except Exception:
super(TestLB, cls).tearDownClass()
raise
@classmethod
def tearDownClass(cls):
super(TestLB, cls).tearDownClass()
def tearDown(self):
super(TestLB, self).tearDown()
def show_commands_at_teardown(self):
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)
def getIPv6Flow(self, id):
return IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) / UDP(
sport=10000 + id, dport=20000
)
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(scapy.compat.raw(gre.payload))
payload_info = self.payload_to_info(inner[Raw])
self.info = self.packet_infos[payload_info.index]
self.assertEqual(payload_info.src, self.pg0.sw_if_index)
self.assertEqual(
scapy.compat.raw(inner), scapy.compat.raw(self.info.data[IPver])
)
def checkCapture(self, encap, isv4, src_ip_sticky=False):
self.pg0.assert_nothing_captured()
out = self.pg1.get_capture(len(self.packets))
load = [0] * len(self.ass)
sticky_as = {}
self.info = None
for p in out:
try:
asid = 0
gre = None
if encap == "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)
gre = p[GRE]
self.checkInner(gre, isv4)
elif encap == "gre6":
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.assertEqual(len(ip.options), 0)
gre = GRE(scapy.compat.raw(p[IPv6].payload))
self.checkInner(gre, isv4)
elif encap == "l3dsr":
ip = p[IP]
asid = int(ip.dst.split(".")[3])
self.assertEqual(ip.version, 4)
self.assertEqual(ip.flags, 0)
self.assertEqual(ip.dst, "10.0.0.%u" % asid)
self.assertEqual(ip.tos, 0x1C)
self.assertEqual(len(ip.options), 0)
self.assert_ip_checksum_valid(p)
if ip.proto == IP_PROTOS.tcp:
self.assert_tcp_checksum_valid(p)
elif ip.proto == IP_PROTOS.udp:
self.assert_udp_checksum_valid(p)
elif encap == "nat4":
ip = p[IP]
asid = int(ip.dst.split(".")[3])
self.assertEqual(ip.version, 4)
self.assertEqual(ip.flags, 0)
self.assertEqual(ip.dst, "10.0.0.%u" % asid)
self.assertEqual(ip.proto, 17)
self.assertEqual(len(ip.options), 0)
udp = p[UDP]
self.assertEqual(udp.dport, 3307)
elif encap == "nat6":
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(
socket.inet_pton(socket.AF_INET6, ip.dst),
socket.inet_pton(socket.AF_INET6, "2002::%u" % asid),
)
self.assertEqual(ip.nh, 17)
self.assertGreaterEqual(ip.hlim, 63)
udp = UDP(scapy.compat.raw(p[IPv6].payload))
self.assertEqual(udp.dport, 3307)
load[asid] += 1
# In case of source ip sticky, check that packets with same
# src_ip are routed to same as.
if src_ip_sticky and sticky_as.get(ip.src, asid) != asid:
raise Exception("Packets with same src_ip are routed to another as")
sticky_as[ip.src] = asid
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# This is just to roughly check that the balancing algorithm
# is not completely biased.
for asid in self.ass:
if load[asid] < int(len(self.packets) / (len(self.ass) * 2)):
self.logger.error(
"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 on vip case"""
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(encap="gre4", 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")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip6_gre4(self):
"""Load Balancer IP6 GRE4 on vip case"""
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(encap="gre4", 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")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_gre6(self):
"""Load Balancer IP4 GRE6 on vip case"""
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(encap="gre6", isv4=True)
finally:
for asid in self.ass:
self.vapi.cli("lb as 90.0.0.0/8 2002::%u del" % (asid))
self.vapi.cli("lb vip 90.0.0.0/8 encap gre6 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip6_gre6(self):
"""Load Balancer IP6 GRE6 on vip case"""
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(encap="gre6", 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")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_gre4_port(self):
"""Load Balancer IP4 GRE4 on per-port-vip case"""
try:
self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4")
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 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(encap="gre4", isv4=True)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
)
self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre4 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip6_gre4_port(self):
"""Load Balancer IP6 GRE4 on per-port-vip case"""
try:
self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre4")
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 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(encap="gre4", isv4=False)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 10.0.0.%u del" % (asid)
)
self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre4 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_gre6_port(self):
"""Load Balancer IP4 GRE6 on per-port-vip case"""
try:
self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6")
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 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(encap="gre6", isv4=True)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 2002::%u del" % (asid)
)
self.vapi.cli("lb vip 90.0.0.0/8 protocol udp port 20000 encap gre6 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip6_gre6_port(self):
"""Load Balancer IP6 GRE6 on per-port-vip case"""
try:
self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre6")
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 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(encap="gre6", isv4=False)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 2002::%u del" % (asid)
)
self.vapi.cli("lb vip 2001::/16 protocol udp port 20000 encap gre6 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_l3dsr(self):
"""Load Balancer IP4 L3DSR on vip case"""
try:
self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7")
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(encap="l3dsr", 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 l3dsr dscp 7 del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_l3dsr_src_ip_sticky(self):
"""Load Balancer IP4 L3DSR on vip with src_ip_sticky case"""
try:
self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7 src_ip_sticky")
for asid in self.ass:
self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
# Generate duplicated packets
pkts = self.generatePackets(self.pg0, isv4=True)
pkts = pkts[: len(pkts) // 2]
pkts = pkts + pkts
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.checkCapture(encap="l3dsr", isv4=True, src_ip_sticky=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 l3dsr dscp 7 src_ip_sticky del")
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_l3dsr_port(self):
"""Load Balancer IP4 L3DSR on per-port-vip case"""
try:
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7"
)
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 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(encap="l3dsr", isv4=True)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
)
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7 del"
)
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_l3dsr_port_src_ip_sticky(self):
"""Load Balancer IP4 L3DSR on per-port-vip with src_ip_sticky case"""
try:
# This VIP at port 1000 does not receive packets, but is defined
# as a dummy to verify that the src_ip_sticky flag can be set
# independently for each port.
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 10000 encap l3dsr dscp 7"
)
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7 src_ip_sticky"
)
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u" % (asid)
)
# Generate duplicated packets
pkts = self.generatePackets(self.pg0, isv4=True)
pkts = pkts[: len(pkts) // 2]
pkts = pkts + pkts
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.checkCapture(encap="l3dsr", isv4=True, src_ip_sticky=True)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
)
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap l3dsr dscp 7 src_ip_sticky del"
)
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 10000 encap l3dsr dscp 7 del"
)
self.vapi.cli("test lb flowtable flush")
def test_lb_ip4_nat4_port(self):
"""Load Balancer IP4 NAT4 on per-port-vip case"""
try:
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap nat4"
" type clusterip target_port 3307"
)
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 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(encap="nat4", isv4=True)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 90.0.0.0/8 protocol udp port 20000 10.0.0.%u del" % (asid)
)
self.vapi.cli(
"lb vip 90.0.0.0/8 protocol udp port 20000 encap nat4"
" type clusterip target_port 3307 del"
)
self.vapi.cli("test lb flowtable flush")
def test_lb_ip6_nat6_port(self):
"""Load Balancer IP6 NAT6 on per-port-vip case"""
try:
self.vapi.cli(
"lb vip 2001::/16 protocol udp port 20000 encap nat6"
" type clusterip target_port 3307"
)
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 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(encap="nat6", isv4=False)
finally:
for asid in self.ass:
self.vapi.cli(
"lb as 2001::/16 protocol udp port 20000 2002::%u del" % (asid)
)
self.vapi.cli(
"lb vip 2001::/16 protocol udp port 20000 encap nat6"
" type clusterip target_port 3307 del"
)
self.vapi.cli("test lb flowtable flush")
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