3 from scapy.layers.inet import IP, UDP
4 from scapy.layers.inet6 import IPv6
5 from scapy.layers.l2 import Ether, GRE
6 from scapy.packet import Raw
8 from framework import VppTestCase
11 """ TestLB is a subclass of VPPTestCase classes.
13 TestLB class defines Load Balancer test cases for:
19 As stated in comments below, GRE has issues with IPv6.
20 All test cases involving IPv6 are executed, but
21 received packets are not parsed and checked.
26 class TestLB(VppTestCase):
27 """ Load Balancer Test Case """
31 super(TestLB, cls).setUpClass()
34 cls.packets = range(100)
37 cls.create_pg_interfaces(range(2))
38 cls.interfaces = list(cls.pg_interfaces)
40 for i in cls.interfaces:
47 dst4 = socket.inet_pton(socket.AF_INET, "10.0.0.0")
48 dst6 = socket.inet_pton(socket.AF_INET6, "2002::")
49 cls.vapi.ip_add_del_route(dst4, 24, cls.pg1.remote_ip4n)
50 cls.vapi.ip_add_del_route(dst6, 16, cls.pg1.remote_ip6n, is_ipv6=1)
51 cls.vapi.cli("lb conf ip4-src-address 39.40.41.42")
52 cls.vapi.cli("lb conf ip6-src-address 2004::1")
54 super(TestLB, cls).tearDownClass()
58 super(TestLB, self).tearDown()
60 self.logger.info(self.vapi.cli("show lb vip verbose"))
62 def getIPv4Flow(self, id):
63 return (IP(dst="90.0.%u.%u" % (id / 255, id % 255),
64 src="40.0.%u.%u" % (id / 255, id % 255)) /
65 UDP(sport=10000 + id, dport=20000 + id))
67 def getIPv6Flow(self, id):
68 return (IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) /
69 UDP(sport=10000 + id, dport=20000 + id))
71 def generatePackets(self, src_if, isv4):
72 self.reset_packet_infos()
74 for pktid in self.packets:
75 info = self.create_packet_info(src_if, self.pg1)
76 payload = self.info_to_payload(info)
77 ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid)
78 packet = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
81 self.extend_packet(packet, 128)
82 info.data = packet.copy()
86 def checkInner(self, gre, isv4):
87 IPver = IP if isv4 else IPv6
88 self.assertEqual(gre.proto, 0x0800 if isv4 else 0x86DD)
89 self.assertEqual(gre.flags, 0)
90 self.assertEqual(gre.version, 0)
91 inner = IPver(str(gre.payload))
92 payload_info = self.payload_to_info(str(inner[Raw]))
93 self.info = self.packet_infos[payload_info.index]
94 self.assertEqual(payload_info.src, self.pg0.sw_if_index)
95 self.assertEqual(str(inner), str(self.info.data[IPver]))
97 def checkCapture(self, gre4, isv4):
98 self.pg0.assert_nothing_captured()
99 out = self.pg1.get_capture(len(self.packets))
101 load = [0] * len(self.ass)
109 asid = int(ip.dst.split(".")[3])
110 self.assertEqual(ip.version, 4)
111 self.assertEqual(ip.flags, 0)
112 self.assertEqual(ip.src, "39.40.41.42")
113 self.assertEqual(ip.dst, "10.0.0.%u" % asid)
114 self.assertEqual(ip.proto, 47)
115 self.assertEqual(len(ip.options), 0)
116 self.assertGreaterEqual(ip.ttl, 64)
120 asid = ip.dst.split(":")
121 asid = asid[len(asid) - 1]
122 asid = 0 if asid == "" else int(asid)
123 self.assertEqual(ip.version, 6)
124 self.assertEqual(ip.tc, 0)
125 self.assertEqual(ip.fl, 0)
126 self.assertEqual(ip.src, "2004::1")
128 socket.inet_pton(socket.AF_INET6, ip.dst),
129 socket.inet_pton(socket.AF_INET6, "2002::%u" % asid)
131 self.assertEqual(ip.nh, 47)
132 self.assertGreaterEqual(ip.hlim, 64)
133 # self.assertEqual(len(ip.options), 0)
134 gre = GRE(str(p[IPv6].payload))
135 self.checkInner(gre, isv4)
138 self.logger.error(ppp("Unexpected or invalid packet:", p))
141 # This is just to roughly check that the balancing algorithm
142 # is not completly biased.
143 for asid in self.ass:
144 if load[asid] < len(self.packets) / (len(self.ass) * 2):
146 "ASS is not balanced: load[%d] = %d" % (asid, load[asid]))
147 raise Exception("Load Balancer algorithm is biased")
149 def test_lb_ip4_gre4(self):
150 """ Load Balancer IP4 GRE4 """
152 self.vapi.cli("lb vip 90.0.0.0/8 encap gre4")
153 for asid in self.ass:
154 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
156 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
157 self.pg_enable_capture(self.pg_interfaces)
159 self.checkCapture(gre4=True, isv4=True)
162 for asid in self.ass:
163 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
164 self.vapi.cli("lb vip 90.0.0.0/8 encap gre4 del")
166 def test_lb_ip6_gre4(self):
167 """ Load Balancer IP6 GRE4 """
170 self.vapi.cli("lb vip 2001::/16 encap gre4")
171 for asid in self.ass:
172 self.vapi.cli("lb as 2001::/16 10.0.0.%u" % (asid))
174 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
175 self.pg_enable_capture(self.pg_interfaces)
178 self.checkCapture(gre4=True, isv4=False)
180 for asid in self.ass:
181 self.vapi.cli("lb as 2001::/16 10.0.0.%u del" % (asid))
182 self.vapi.cli("lb vip 2001::/16 encap gre4 del")
184 def test_lb_ip4_gre6(self):
185 """ Load Balancer IP4 GRE6 """
187 self.vapi.cli("lb vip 90.0.0.0/8 encap gre6")
188 for asid in self.ass:
189 self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
191 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
192 self.pg_enable_capture(self.pg_interfaces)
195 self.checkCapture(gre4=False, isv4=True)
197 for asid in self.ass:
198 self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
199 self.vapi.cli("lb vip 90.0.0.0/8 encap gre6 del")
201 def test_lb_ip6_gre6(self):
202 """ Load Balancer IP6 GRE6 """
204 self.vapi.cli("lb vip 2001::/16 encap gre6")
205 for asid in self.ass:
206 self.vapi.cli("lb as 2001::/16 2002::%u" % (asid))
208 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
209 self.pg_enable_capture(self.pg_interfaces)
212 self.checkCapture(gre4=False, isv4=False)
214 for asid in self.ass:
215 self.vapi.cli("lb as 2001::/16 2002::%u del" % (asid))
216 self.vapi.cli("lb vip 2001::/16 encap gre6 del")