1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
#!/usr/bin/env python3
import unittest
import socket
from framework import VppTestCase, VppTestRunner
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsRoute, \
VppIpTable, VppMplsTable, VppMplsLabel
from vpp_mpls_tunnel_interface import VppMPLSTunnelInterface
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6, ICMPv6TimeExceeded
from scapy.contrib.mpls import MPLS
def verify_filter(capture, sent):
if not len(capture) == len(sent):
# filter out any IPv6 RAs from the capture
for p in capture:
if p.haslayer(IPv6):
capture.remove(p)
return capture
def verify_mpls_stack(tst, rx, mpls_labels):
# the rx'd packet has the MPLS label popped
eth = rx[Ether]
tst.assertEqual(eth.type, 0x8847)
rx_mpls = rx[MPLS]
for ii in range(len(mpls_labels)):
tst.assertEqual(rx_mpls.label, mpls_labels[ii].value)
tst.assertEqual(rx_mpls.cos, mpls_labels[ii].exp)
tst.assertEqual(rx_mpls.ttl, mpls_labels[ii].ttl)
if ii == len(mpls_labels) - 1:
tst.assertEqual(rx_mpls.s, 1)
else:
# not end of stack
tst.assertEqual(rx_mpls.s, 0)
# pop the label to expose the next
rx_mpls = rx_mpls[MPLS].payload
class TestSRMPLS(VppTestCase):
""" SR-MPLS Test Case """
@classmethod
def setUpClass(cls):
super(TestSRMPLS, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestSRMPLS, cls).tearDownClass()
def setUp(self):
super(TestSRMPLS, self).setUp()
# create 2 pg interfaces
self.create_pg_interfaces(range(4))
# setup both interfaces
# assign them different tables.
table_id = 0
self.tables = []
tbl = VppMplsTable(self, 0)
tbl.add_vpp_config()
self.tables.append(tbl)
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
i.enable_mpls()
def tearDown(self):
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.ip6_disable()
i.disable_mpls()
i.admin_down()
super(TestSRMPLS, self).tearDown()
def create_stream_ip4(self, src_if, dst_ip, ip_ttl=64, ip_dscp=0):
self.reset_packet_infos()
pkts = []
for i in range(0, 257):
info = self.create_packet_info(src_if, src_if)
payload = self.info_to_payload(info)
p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
IP(src=src_if.remote_ip4, dst=dst_ip,
ttl=ip_ttl, tos=ip_dscp) /
UDP(sport=1234, dport=1234) /
Raw(payload))
info.data = p.copy()
pkts.append(p)
return pkts
def verify_capture_labelled_ip4(self, src_if, capture, sent,
mpls_labels, ip_ttl=None):
try:
capture = verify_filter(capture, sent)
self.assertEqual(len(capture), len(sent))
for i in range(len(capture)):
tx = sent[i]
rx = capture[i]
tx_ip = tx[IP]
rx_ip = rx[IP]
verify_mpls_stack(self, rx, mpls_labels)
self.assertEqual(rx_ip.src, tx_ip.src)
self.assertEqual(rx_ip.dst, tx_ip.dst)
if not ip_ttl:
# IP processing post pop has decremented the TTL
self.assertEqual(rx_ip.ttl + 1, tx_ip.ttl)
else:
self.assertEqual(rx_ip.ttl, ip_ttl)
except:
raise
def verify_capture_tunneled_ip4(self, src_if, capture, sent, mpls_labels):
try:
capture = verify_filter(capture, sent)
self.assertEqual(len(capture), len(sent))
for i in range(len(capture)):
tx = sent[i]
rx = capture[i]
tx_ip = tx[IP]
rx_ip = rx[IP]
verify_mpls_stack(self, rx, mpls_labels)
self.assertEqual(rx_ip.src, tx_ip.src)
self.assertEqual(rx_ip.dst, tx_ip.dst)
# IP processing post pop has decremented the TTL
self.assertEqual(rx_ip.ttl + 1, tx_ip.ttl)
except:
raise
def test_sr_mpls(self):
""" SR MPLS """
#
# A simple MPLS xconnect - neos label in label out
#
route_32_eos = VppMplsRoute(self, 32, 0,
[VppRoutePath(self.pg0.remote_ip4,
self.pg0.sw_if_index,
labels=[VppMplsLabel(32)])])
route_32_eos.add_vpp_config()
#
# A binding SID with only one label
#
self.vapi.sr_mpls_policy_add(999, 1, 0, [32])
#
# A labeled IP route that resolves thru the binding SID
#
ip_10_0_0_1 = VppIpRoute(self, "10.0.0.1", 32,
[VppRoutePath("0.0.0.0",
0xffffffff,
nh_via_label=999,
labels=[VppMplsLabel(55)])])
ip_10_0_0_1.add_vpp_config()
tx = self.create_stream_ip4(self.pg1, "10.0.0.1")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_labelled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32),
VppMplsLabel(55)])
#
# An unlabeled IP route that resolves thru the binding SID
#
ip_10_0_0_1 = VppIpRoute(self, "10.0.0.2", 32,
[VppRoutePath("0.0.0.0",
0xffffffff,
nh_via_label=999)])
ip_10_0_0_1.add_vpp_config()
tx = self.create_stream_ip4(self.pg1, "10.0.0.2")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_labelled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32)])
self.vapi.sr_mpls_policy_del(999)
#
# this time the SID has many labels pushed
#
self.vapi.sr_mpls_policy_add(999, 1, 0, [32, 33, 34])
tx = self.create_stream_ip4(self.pg1, "10.0.0.1")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_labelled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32),
VppMplsLabel(33),
VppMplsLabel(34),
VppMplsLabel(55)])
tx = self.create_stream_ip4(self.pg1, "10.0.0.2")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_labelled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32),
VppMplsLabel(33),
VppMplsLabel(34)])
#
# Resolve an MPLS tunnel via the SID
#
mpls_tun = VppMPLSTunnelInterface(
self,
[VppRoutePath("0.0.0.0",
0xffffffff,
nh_via_label=999,
labels=[VppMplsLabel(44),
VppMplsLabel(46)])])
mpls_tun.add_vpp_config()
mpls_tun.admin_up()
#
# add an unlabelled route through the new tunnel
#
route_10_0_0_3 = VppIpRoute(self, "10.0.0.3", 32,
[VppRoutePath("0.0.0.0",
mpls_tun._sw_if_index)])
route_10_0_0_3.add_vpp_config()
self.logger.info(self.vapi.cli("sh mpls tun 0"))
self.logger.info(self.vapi.cli("sh adj 21"))
tx = self.create_stream_ip4(self.pg1, "10.0.0.3")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_tunneled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32),
VppMplsLabel(33),
VppMplsLabel(34),
VppMplsLabel(44),
VppMplsLabel(46)])
#
# add a labelled route through the new tunnel
#
route_10_0_0_3 = VppIpRoute(self, "10.0.0.4", 32,
[VppRoutePath("0.0.0.0",
mpls_tun._sw_if_index,
labels=[VppMplsLabel(55)])])
route_10_0_0_3.add_vpp_config()
tx = self.create_stream_ip4(self.pg1, "10.0.0.4")
rx = self.send_and_expect(self.pg1, tx, self.pg0)
self.verify_capture_tunneled_ip4(self.pg0, rx, tx,
[VppMplsLabel(32),
VppMplsLabel(33),
VppMplsLabel(34),
VppMplsLabel(44),
VppMplsLabel(46),
VppMplsLabel(55)])
self.vapi.sr_mpls_policy_del(999)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
