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:
20 As stated in comments below, GRE has issues with IPv6.
21 All test cases involving IPv6 are executed, but
22 received packets are not parsed and checked.
27 class TestLB(VppTestCase):
28 """ Load Balancer Test Case """
32 super(TestLB, cls).setUpClass()
35 cls.packets = range(100)
38 cls.create_pg_interfaces(range(2))
39 cls.interfaces = list(cls.pg_interfaces)
41 for i in cls.interfaces:
48 dst4 = socket.inet_pton(socket.AF_INET, "10.0.0.0")
49 dst6 = socket.inet_pton(socket.AF_INET6, "2002::")
50 cls.vapi.ip_add_del_route(dst4, 24, cls.pg1.remote_ip4n)
51 cls.vapi.ip_add_del_route(dst6, 16, cls.pg1.remote_ip6n, is_ipv6=1)
52 cls.vapi.cli("lb conf ip4-src-address 39.40.41.42")
53 cls.vapi.cli("lb conf ip6-src-address 2004::1")
55 super(TestLB, cls).tearDownClass()
59 super(TestLB, self).tearDown()
61 self.logger.info(self.vapi.cli("show lb vip verbose"))
63 def getIPv4Flow(self, id):
64 return (IP(dst="90.0.%u.%u" % (id / 255, id % 255),
65 src="40.0.%u.%u" % (id / 255, id % 255)) /
66 UDP(sport=10000 + id, dport=20000 + id))
68 def getIPv6Flow(self, id):
69 return (IPv6(dst="2001::%u" % (id), src="fd00:f00d:ffff::%u" % (id)) /
70 UDP(sport=10000 + id, dport=20000 + id))
72 def generatePackets(self, src_if, isv4):
73 self.reset_packet_infos()
75 for pktid in self.packets:
76 info = self.create_packet_info(src_if, self.pg1)
77 payload = self.info_to_payload(info)
78 ip = self.getIPv4Flow(pktid) if isv4 else self.getIPv6Flow(pktid)
79 packet = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
82 self.extend_packet(packet, 128)
83 info.data = packet.copy()
87 def checkInner(self, gre, isv4):
88 IPver = IP if isv4 else IPv6
89 self.assertEqual(gre.proto, 0x0800 if isv4 else 0x86DD)
90 self.assertEqual(gre.flags, 0)
91 self.assertEqual(gre.version, 0)
92 inner = IPver(str(gre.payload))
93 payload_info = self.payload_to_info(str(inner[Raw]))
94 self.info = self.packet_infos[payload_info.index]
95 self.assertEqual(payload_info.src, self.pg0.sw_if_index)
96 self.assertEqual(str(inner), str(self.info.data[IPver]))
98 def checkCapture(self, encap, isv4):
99 self.pg0.assert_nothing_captured()
100 out = self.pg1.get_capture(len(self.packets))
102 load = [0] * len(self.ass)
108 if (encap == 'gre4'):
110 asid = int(ip.dst.split(".")[3])
111 self.assertEqual(ip.version, 4)
112 self.assertEqual(ip.flags, 0)
113 self.assertEqual(ip.src, "39.40.41.42")
114 self.assertEqual(ip.dst, "10.0.0.%u" % asid)
115 self.assertEqual(ip.proto, 47)
116 self.assertEqual(len(ip.options), 0)
117 self.assertGreaterEqual(ip.ttl, 64)
119 self.checkInner(gre, isv4)
120 elif (encap == 'gre6'):
122 asid = ip.dst.split(":")
123 asid = asid[len(asid) - 1]
124 asid = 0 if asid == "" else int(asid)
125 self.assertEqual(ip.version, 6)
126 self.assertEqual(ip.tc, 0)
127 self.assertEqual(ip.fl, 0)
128 self.assertEqual(ip.src, "2004::1")
130 socket.inet_pton(socket.AF_INET6, ip.dst),
131 socket.inet_pton(socket.AF_INET6, "2002::%u" % asid)
133 self.assertEqual(ip.nh, 47)
134 self.assertGreaterEqual(ip.hlim, 64)
135 # self.assertEqual(len(ip.options), 0)
136 gre = GRE(str(p[IPv6].payload))
137 self.checkInner(gre, isv4)
138 if (encap == 'l3dsr'):
140 asid = int(ip.dst.split(".")[3])
141 self.assertEqual(ip.version, 4)
142 self.assertEqual(ip.flags, 0)
143 self.assertEqual(ip.dst, "10.0.0.%u" % asid)
144 self.assertEqual(ip.tos, 0x1c)
145 self.assertEqual(len(ip.options), 0)
148 self.logger.error(ppp("Unexpected or invalid packet:", p))
151 # This is just to roughly check that the balancing algorithm
152 # is not completly biased.
153 for asid in self.ass:
154 if load[asid] < len(self.packets) / (len(self.ass) * 2):
156 "ASS is not balanced: load[%d] = %d" % (asid, load[asid]))
157 raise Exception("Load Balancer algorithm is biased")
159 def test_lb_ip4_gre4(self):
160 """ Load Balancer IP4 GRE4 """
162 self.vapi.cli("lb vip 90.0.0.0/8 encap gre4")
163 for asid in self.ass:
164 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
166 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
167 self.pg_enable_capture(self.pg_interfaces)
169 self.checkCapture(encap='gre4', isv4=True)
172 for asid in self.ass:
173 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
174 self.vapi.cli("lb vip 90.0.0.0/8 encap gre4 del")
175 self.vapi.cli("test lb flowtable flush")
177 def test_lb_ip6_gre4(self):
178 """ Load Balancer IP6 GRE4 """
181 self.vapi.cli("lb vip 2001::/16 encap gre4")
182 for asid in self.ass:
183 self.vapi.cli("lb as 2001::/16 10.0.0.%u" % (asid))
185 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
186 self.pg_enable_capture(self.pg_interfaces)
189 self.checkCapture(encap='gre4', isv4=False)
191 for asid in self.ass:
192 self.vapi.cli("lb as 2001::/16 10.0.0.%u del" % (asid))
193 self.vapi.cli("lb vip 2001::/16 encap gre4 del")
194 self.vapi.cli("test lb flowtable flush")
196 def test_lb_ip4_gre6(self):
197 """ Load Balancer IP4 GRE6 """
199 self.vapi.cli("lb vip 90.0.0.0/8 encap gre6")
200 for asid in self.ass:
201 self.vapi.cli("lb as 90.0.0.0/8 2002::%u" % (asid))
203 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
204 self.pg_enable_capture(self.pg_interfaces)
207 self.checkCapture(encap='gre6', isv4=True)
209 for asid in self.ass:
210 self.vapi.cli("lb as 90.0.0.0/8 2002::%u del" % (asid))
211 self.vapi.cli("lb vip 90.0.0.0/8 encap gre6 del")
212 self.vapi.cli("test lb flowtable flush")
214 def test_lb_ip6_gre6(self):
215 """ Load Balancer IP6 GRE6 """
217 self.vapi.cli("lb vip 2001::/16 encap gre6")
218 for asid in self.ass:
219 self.vapi.cli("lb as 2001::/16 2002::%u" % (asid))
221 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=False))
222 self.pg_enable_capture(self.pg_interfaces)
225 self.checkCapture(encap='gre6', isv4=False)
227 for asid in self.ass:
228 self.vapi.cli("lb as 2001::/16 2002::%u del" % (asid))
229 self.vapi.cli("lb vip 2001::/16 encap gre6 del")
230 self.vapi.cli("test lb flowtable flush")
232 def test_lb_ip4_l3dsr(self):
233 """ Load Balancer IP4 L3DSR """
235 self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7")
236 for asid in self.ass:
237 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u" % (asid))
239 self.pg0.add_stream(self.generatePackets(self.pg0, isv4=True))
240 self.pg_enable_capture(self.pg_interfaces)
242 self.checkCapture(encap='l3dsr', isv4=True)
245 for asid in self.ass:
246 self.vapi.cli("lb as 90.0.0.0/8 10.0.0.%u del" % (asid))
247 self.vapi.cli("lb vip 90.0.0.0/8 encap l3dsr dscp 7 del")
248 self.vapi.cli("test lb flowtable flush")