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
|
n156' href='#n156'>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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
|
#!/usr/bin/env python3
import unittest
import binascii
from socket import AF_INET6
from framework import VppTestCase, VppTestRunner
from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto, VppIpTable
from vpp_srv6 import SRv6LocalSIDBehaviors, VppSRv6LocalSID, VppSRv6Policy, \
SRv6PolicyType, VppSRv6Steering, SRv6PolicySteeringTypes
import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q
from scapy.layers.inet6 import IPv6, UDP, IPv6ExtHdrSegmentRouting
from scapy.layers.inet import IP, UDP
from util import ppp
class TestSRv6(VppTestCase):
""" SRv6 Static Proxy plugin Test Case """
@classmethod
def setUpClass(self):
super(TestSRv6, self).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestSRv6, cls).tearDownClass()
def setUp(self):
""" Perform test setup before each test case.
"""
super(TestSRv6, self).setUp()
# packet sizes, inclusive L2 overhead
self.pg_packet_sizes = [64, 512, 1518, 9018]
# reset packet_infos
self.reset_packet_infos()
def tearDown(self):
""" Clean up test setup after each test case.
"""
self.teardown_interfaces()
super(TestSRv6, self).tearDown()
def configure_interface(self,
interface,
ipv6=False, ipv4=False,
ipv6_table_id=0, ipv4_table_id=0):
""" Configure interface.
:param ipv6: configure IPv6 on interface
:param ipv4: configure IPv4 on interface
:param ipv6_table_id: FIB table_id for IPv6
:param ipv4_table_id: FIB table_id for IPv4
"""
self.logger.debug("Configuring interface %s" % (interface.name))
if ipv6:
self.logger.debug("Configuring IPv6")
interface.set_table_ip6(ipv6_table_id)
interface.config_ip6()
interface.resolve_ndp(timeout=5)
if ipv4:
self.logger.debug("Configuring IPv4")
interface.set_table_ip4(ipv4_table_id)
interface.config_ip4()
interface.resolve_arp()
interface.admin_up()
def setup_interfaces(self, ipv6=[], ipv4=[],
ipv6_table_id=[], ipv4_table_id=[]):
""" Create and configure interfaces.
:param ipv6: list of interface IPv6 capabilities
:param ipv4: list of interface IPv4 capabilities
:param ipv6_table_id: list of intf IPv6 FIB table_ids
:param ipv4_table_id: list of intf IPv4 FIB table_ids
:returns: List of created interfaces.
"""
# how many interfaces?
if len(ipv6):
count = len(ipv6)
else:
count = len(ipv4)
self.logger.debug("Creating and configuring %d interfaces" % (count))
# fill up ipv6 and ipv4 lists if needed
# not enabled (False) is the default
if len(ipv6) < count:
ipv6 += (count - len(ipv6)) * [False]
if len(ipv4) < count:
ipv4 += (count - len(ipv4)) * [False]
# fill up table_id lists if needed
# table_id 0 (global) is the default
if len(ipv6_table_id) < count:
ipv6_table_id += (count - len(ipv6_table_id)) * [0]
if len(ipv4_table_id) < count:
ipv4_table_id += (count - len(ipv4_table_id)) * [0]
# create 'count' pg interfaces
self.create_pg_interfaces(range(count))
# setup all interfaces
for i in range(count):
intf = self.pg_interfaces[i]
self.configure_interface(intf,
ipv6[i], ipv4[i],
ipv6_table_id[i], ipv4_table_id[i])
if any(ipv6):
self.logger.debug(self.vapi.cli("show ip6 neighbors"))
if any(ipv4):
self.logger.debug(self.vapi.cli("show ip4 neighbors"))
self.logger.debug(self.vapi.cli("show interface"))
self.logger.debug(self.vapi.cli("show hardware"))
return self.pg_interfaces
def teardown_interfaces(self):
""" Unconfigure and bring down interface.
"""
self.logger.debug("Tearing down interfaces")
# tear down all interfaces
# AFAIK they cannot be deleted
for i in self.pg_interfaces:
self.logger.debug("Tear down interface %s" % (i.name))
i.admin_down()
i.unconfig()
i.set_table_ip4(0)
i.set_table_ip6(0)
def test_SRv6_End_AS_IPv6_noSRH(self):
""" Test SRv6 End.AS behavior with IPv6 traffic and no SRH rewrite.
"""
self.run_SRv6_End_AS_IPv6(
sid_list=['a1::', 'a2::a6', 'a3::'],
test_sid_index=1,
rewrite_src_addr='a2::')
def test_SRv6_End_AS_IPv6_SRH(self):
""" Test SRv6 End.AS behavior with IPv6 traffic and SRH rewrite.
"""
self.run_SRv6_End_AS_IPv6(
sid_list=['a1::a6', 'a2::', 'a3::'],
test_sid_index=0,
rewrite_src_addr='a1::')
def test_SRv6_End_AS_IPv4_noSRH(self):
""" Test SRv6 End.AS behavior with IPv4 traffic and no SRH rewrite.
"""
self.run_SRv6_End_AS_IPv4(
sid_list=['a1::', 'a2::a6', 'a3::'],
test_sid_index=1,
rewrite_src_addr='a2::')
def test_SRv6_End_AS_IPv4_SRH(self):
""" Test SRv6 End.AS behavior with IPv4 traffic and SRH rewrite.
"""
self.run_SRv6_End_AS_IPv4(
sid_list=['a1::a6', 'a2::', 'a3::'],
test_sid_index=0,
rewrite_src_addr='a1::')
def test_SRv6_End_AS_L2_noSRH(self):
""" Test SRv6 End.AS behavior with L2 traffic and no SRH rewrite.
"""
self.run_SRv6_End_AS_L2(
sid_list=['a1::', 'a2::a6', 'a3::'],
test_sid_index=1,
rewrite_src_addr='a2::')
def test_SRv6_End_AS_L2_SRH(self):
""" Test SRv6 End.AS behavior with L2 traffic and SRH rewrite.
"""
self.run_SRv6_End_AS_L2(
sid_list=['a1::a6', 'a2::', 'a3::'],
test_sid_index=0,
rewrite_src_addr='a1::')
def run_SRv6_End_AS_L2(self, sid_list, test_sid_index, rewrite_src_addr):
""" Run SRv6 End.AS test with L2 traffic.
"""
self.rewrite_src_addr = rewrite_src_addr
self.rewrite_sid_list = sid_list[test_sid_index + 1::]
# send traffic to one destination interface
# source and destination interfaces are IPv6 only
self.setup_interfaces(ipv6=[True, False])
# configure route to next segment
route = VppIpRoute(self, sid_list[test_sid_index + 1], 128,
[VppRoutePath(self.pg0.remote_ip6,
self.pg0.sw_if_index)])
route.add_vpp_config()
# configure SRv6 localSID behavior
cli_str = "sr localsid address " + sid_list[test_sid_index] \
+ " behavior end.as" \
+ " oif " + self.pg1.name \
+ " iif " + self.pg1.name \
+ " src " + self.rewrite_src_addr
for s in self.rewrite_sid_list:
cli_str += " next " + s
self.vapi.cli(cli_str)
# log the localsids
self.logger.debug(self.vapi.cli("show sr localsid"))
# send one packet per packet size
count = len(self.pg_packet_sizes)
# prepare L2 in SRv6 headers
packet_header1 = self.create_packet_header_IPv6_SRH_L2(
sidlist=sid_list[::-1],
segleft=len(sid_list) - test_sid_index - 1,
vlan=0)
# generate packets (pg0->pg1)
pkts1 = self.create_stream(self.pg0, self.pg1, packet_header1,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg0, pkts1, self.pg1,
self.compare_rx_tx_packet_End_AS_L2_out)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# prepare L2 header for returning packets
packet_header2 = self.create_packet_header_L2()
# generate returning packets (pg1->pg0)
pkts2 = self.create_stream(self.pg1, self.pg0, packet_header2,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg1, pkts2, self.pg0,
self.compare_rx_tx_packet_End_AS_L2_in)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# remove SRv6 localSIDs
self.vapi.cli("sr localsid del address " + sid_list[test_sid_index])
# cleanup interfaces
self.teardown_interfaces()
def run_SRv6_End_AS_IPv6(self, sid_list, test_sid_index, rewrite_src_addr):
""" Run SRv6 End.AS test with IPv6 traffic.
"""
self.rewrite_src_addr = rewrite_src_addr
self.rewrite_sid_list = sid_list[test_sid_index + 1::]
# send traffic to one destination interface
# source and destination interfaces are IPv6 only
self.setup_interfaces(ipv6=[True, True])
# configure route to next segment
route = VppIpRoute(self, sid_list[test_sid_index + 1], 128,
[VppRoutePath(self.pg0.remote_ip6,
self.pg0.sw_if_index)])
route.add_vpp_config()
# configure SRv6 localSID behavior
cli_str = "sr localsid address " + sid_list[test_sid_index] \
+ " behavior end.as" \
+ " nh " + self.pg1.remote_ip6 \
+ " oif " + self.pg1.name \
+ " iif " + self.pg1.name \
+ " src " + self.rewrite_src_addr
for s in self.rewrite_sid_list:
cli_str += " next " + s
self.vapi.cli(cli_str)
# log the localsids
self.logger.debug(self.vapi.cli("show sr localsid"))
# send one packet per packet size
count = len(self.pg_packet_sizes)
# prepare IPv6 in SRv6 headers
packet_header1 = self.create_packet_header_IPv6_SRH_IPv6(
sidlist=sid_list[::-1],
segleft=len(sid_list) - test_sid_index - 1)
# generate packets (pg0->pg1)
pkts1 = self.create_stream(self.pg0, self.pg1, packet_header1,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg0, pkts1, self.pg1,
self.compare_rx_tx_packet_End_AS_IPv6_out)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# prepare IPv6 header for returning packets
packet_header2 = self.create_packet_header_IPv6()
# generate returning packets (pg1->pg0)
pkts2 = self.create_stream(self.pg1, self.pg0, packet_header2,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg1, pkts2, self.pg0,
self.compare_rx_tx_packet_End_AS_IPv6_in)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# remove SRv6 localSIDs
self.vapi.cli("sr localsid del address " + sid_list[test_sid_index])
# cleanup interfaces
self.teardown_interfaces()
def run_SRv6_End_AS_IPv4(self, sid_list, test_sid_index, rewrite_src_addr):
""" Run SRv6 End.AS test with IPv4 traffic.
"""
self.rewrite_src_addr = rewrite_src_addr
self.rewrite_sid_list = sid_list[test_sid_index + 1::]
# send traffic to one destination interface
# source and destination interfaces are IPv6 only
self.setup_interfaces(ipv6=[True, False], ipv4=[True, True])
# configure route to next segment
route = VppIpRoute(self, sid_list[test_sid_index + 1], 128,
[VppRoutePath(self.pg0.remote_ip6,
self.pg0.sw_if_index)])
route.add_vpp_config()
# configure SRv6 localSID behavior
cli_str = "sr localsid address " + sid_list[test_sid_index] \
+ " behavior end.as" \
+ " nh " + self.pg1.remote_ip4 \
+ " oif " + self.pg1.name \
+ " iif " + self.pg1.name \
+ " src " + self.rewrite_src_addr
for s in self.rewrite_sid_list:
cli_str += " next " + s
self.vapi.cli(cli_str)
# log the localsids
self.logger.debug(self.vapi.cli("show sr localsid"))
# send one packet per packet size
count = len(self.pg_packet_sizes)
# prepare IPv4 in SRv6 headers
packet_header1 = self.create_packet_header_IPv6_SRH_IPv4(
sidlist=sid_list[::-1],
segleft=len(sid_list) - test_sid_index - 1)
# generate packets (pg0->pg1)
pkts1 = self.create_stream(self.pg0, self.pg1, packet_header1,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg0, pkts1, self.pg1,
self.compare_rx_tx_packet_End_AS_IPv4_out)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# prepare IPv6 header for returning packets
packet_header2 = self.create_packet_header_IPv4()
# generate returning packets (pg1->pg0)
pkts2 = self.create_stream(self.pg1, self.pg0, packet_header2,
self.pg_packet_sizes, count)
# send packets and verify received packets
self.send_and_verify_pkts(self.pg1, pkts2, self.pg0,
self.compare_rx_tx_packet_End_AS_IPv4_in)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# remove SRv6 localSIDs
self.vapi.cli("sr localsid del address " + sid_list[test_sid_index])
# cleanup interfaces
self.teardown_interfaces()
def compare_rx_tx_packet_End_AS_IPv6_in(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
rx_srh = None
tx_ip = tx_pkt.getlayer(IPv6)
# expected segment-list (SRH order)
tx_seglist = self.rewrite_sid_list[::-1]
# received ip.src should be equal to SR Policy source
self.assertEqual(rx_ip.src, self.rewrite_src_addr)
# received ip.dst should be equal to expected sidlist[lastentry]
self.assertEqual(rx_ip.dst, tx_seglist[-1])
if len(tx_seglist) > 1:
# rx'ed packet should have SRH
self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get SRH
rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
# rx'ed seglist should be equal to expected seglist
self.assertEqual(rx_srh.addresses, tx_seglist)
# segleft should be equal to size expected seglist-1
self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
# segleft should be equal to lastentry
self.assertEqual(rx_srh.segleft, rx_srh.lastentry)
# get payload
payload = rx_srh.payload
else:
# rx'ed packet should NOT have SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get payload
payload = rx_ip.payload
# the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
# except for the hop-limit field
# -> update tx'ed hlim to the expected hlim
tx_ip.hlim = tx_ip.hlim - 1
self.assertEqual(payload, tx_ip)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AS_IPv4_in(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
rx_srh = None
tx_ip = tx_pkt.getlayer(IP)
# expected segment-list (SRH order)
tx_seglist = self.rewrite_sid_list[::-1]
# received ip.src should be equal to SR Policy source
self.assertEqual(rx_ip.src, self.rewrite_src_addr)
# received ip.dst should be equal to expected sidlist[lastentry]
self.assertEqual(rx_ip.dst, tx_seglist[-1])
if len(tx_seglist) > 1:
# rx'ed packet should have SRH and IPv4 header
self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
self.assertTrue(rx_ip.payload.haslayer(IP))
# get SRH
rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
# rx'ed seglist should be equal to seglist
self.assertEqual(rx_srh.addresses, tx_seglist)
# segleft should be equal to size seglist-1
self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
# segleft should be equal to lastentry
self.assertEqual(rx_srh.segleft, rx_srh.lastentry)
payload = rx_srh.payload
else:
# rx'ed packet should NOT have SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get payload
payload = rx_ip.payload
# the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
# except for the ttl field and ip checksum
# -> adjust tx'ed ttl to expected ttl
tx_ip.ttl = tx_ip.ttl - 1
# -> set tx'ed ip checksum to None and let scapy recompute
tx_ip.chksum = None
# read back the pkt (with str()) to force computing these fields
# probably other ways to accomplish this are possible
tx_ip = IP(scapy.compat.raw(tx_ip))
self.assertEqual(payload, tx_ip)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AS_L2_in(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
rx_srh = None
tx_ether = tx_pkt.getlayer(Ether)
# expected segment-list (SRH order)
tx_seglist = self.rewrite_sid_list[::-1]
# received ip.src should be equal to SR Policy source
self.assertEqual(rx_ip.src, self.rewrite_src_addr)
# received ip.dst should be equal to expected sidlist[lastentry]
self.assertEqual(rx_ip.dst, tx_seglist[-1])
if len(tx_seglist) > 1:
# rx'ed packet should have SRH
self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get SRH
rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
# rx'ed seglist should be equal to seglist
self.assertEqual(rx_srh.addresses, tx_seglist)
# segleft should be equal to size seglist-1
self.assertEqual(rx_srh.segleft, len(tx_seglist)-1)
# segleft should be equal to lastentry
self.assertEqual(rx_srh.segleft, rx_srh.lastentry)
# nh should be "No Next Header" (143)
self.assertEqual(rx_srh.nh, 143)
# get payload
payload = rx_srh.payload
else:
# rx'ed packet should NOT have SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get payload
payload = rx_ip.payload
# the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
self.assertEqual(Ether(scapy.compat.raw(payload)), tx_ether)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AS_IPv6_out(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS with IPv6
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
tx_ip = tx_pkt.getlayer(IPv6)
tx_ip2 = tx_pkt.getlayer(IPv6, 2)
# verify if rx'ed packet has no SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# the whole rx_ip pkt should be equal to tx_ip2
# except for the hlim field
# -> adjust tx'ed hlim to expected hlim
tx_ip2.hlim = tx_ip2.hlim - 1
self.assertEqual(rx_ip, tx_ip2)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AS_IPv4_out(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS with IPv4
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get IPv4 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IP)
tx_ip = tx_pkt.getlayer(IPv6)
tx_ip2 = tx_pkt.getlayer(IP)
# verify if rx'ed packet has no SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# the whole rx_ip pkt should be equal to tx_ip2
# except for the ttl field and ip checksum
# -> adjust tx'ed ttl to expected ttl
tx_ip2.ttl = tx_ip2.ttl - 1
# -> set tx'ed ip checksum to None and let scapy recompute
tx_ip2.chksum = None
# read back the pkt (with str()) to force computing these fields
# probably other ways to accomplish this are possible
tx_ip2 = IP(scapy.compat.raw(tx_ip2))
self.assertEqual(rx_ip, tx_ip2)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AS_L2_out(self, tx_pkt, rx_pkt):
""" Compare input and output packet after passing End.AS with L2
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get IPv4 header of rx'ed packet
rx_eth = rx_pkt.getlayer(Ether)
tx_ip = tx_pkt.getlayer(IPv6)
# we can't just get the 2nd Ether layer
# get the Raw content and dissect it as Ether
tx_eth1 = Ether(scapy.compat.raw(tx_pkt[Raw]))
# verify if rx'ed packet has no SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# the whole rx_eth pkt should be equal to tx_eth1
self.assertEqual(rx_eth, tx_eth1)
self.logger.debug("packet verification: SUCCESS")
def create_stream(self, src_if, dst_if, packet_header, packet_sizes,
count):
"""Create SRv6 input packet stream for defined interface.
:param VppInterface src_if: Interface to create packet stream for
:param VppInterface dst_if: destination interface of packet stream
:param packet_header: Layer3 scapy packet headers,
L2 is added when not provided,
Raw(payload) with packet_info is added
:param list packet_sizes: packet stream pckt sizes,sequentially applied
to packets in stream have
:param int count: number of packets in packet stream
:return: list of packets
"""
self.logger.info("Creating packets")
pkts = []
for i in range(0, count-1):
payload_info = self.create_packet_info(src_if, dst_if)
self.logger.debug(
"Creating packet with index %d" % (payload_info.index))
payload = self.info_to_payload(payload_info)
# add L2 header if not yet provided in packet_header
if packet_header.getlayer(0).name == 'Ethernet':
p = (packet_header /
Raw(payload))
else:
p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
packet_header /
Raw(payload))
size = packet_sizes[i % len(packet_sizes)]
self.logger.debug("Packet size %d" % (size))
self.extend_packet(p, size)
# we need to store the packet with the automatic fields computed
# read back the dumped packet (with str())
# to force computing these fields
# probably other ways are possible
p = Ether(scapy.compat.raw(p))
payload_info.data = p.copy()
self.logger.debug(ppp("Created packet:", p))
pkts.append(p)
self.logger.info("Done creating packets")
return pkts
def send_and_verify_pkts(self, input, pkts, output, compare_func):
"""Send packets and verify received packets using compare_func
:param input: ingress interface of DUT
:param pkts: list of packets to transmit
:param output: egress interface of DUT
:param compare_func: function to compare in and out packets
"""
# add traffic stream to input interface
input.add_stream(pkts)
# enable capture on all interfaces
self.pg_enable_capture(self.pg_interfaces)
# start traffic
self.logger.info("Starting traffic")
self.pg_start()
# get output capture
self.logger.info("Getting packet capture")
capture = output.get_capture()
# assert nothing was captured on input interface
# input.assert_nothing_captured()
# verify captured packets
self.verify_captured_pkts(output, capture, compare_func)
def create_packet_header_IPv6(self):
"""Create packet header: IPv6 header, UDP header
:param dst: IPv6 destination address
IPv6 source address is 1234::1
IPv6 destination address is 4321::1
UDP source port and destination port are 1234
"""
p = (IPv6(src='1234::1', dst='4321::1') /
UDP(sport=1234, dport=1234))
return p
def create_packet_header_IPv6_SRH_IPv6(self, sidlist, segleft):
"""Create packet header: IPv6 encapsulated in SRv6:
IPv6 header with SRH, IPv6 header, UDP header
:param list sidlist: segment list of outer IPv6 SRH
:param int segleft: segments-left field of outer IPv6 SRH
Outer IPv6 source address is set to 5678::1
Outer IPv6 destination address is set to sidlist[segleft]
IPv6 source addresses is 1234::1
IPv6 destination address is 4321::1
UDP source port and destination port are 1234
"""
p = (IPv6(src='5678::1', dst=sidlist[segleft]) /
IPv6ExtHdrSegmentRouting(addresses=sidlist,
segleft=segleft, nh=41) /
IPv6(src='1234::1', dst='4321::1') /
UDP(sport=1234, dport=1234))
return p
def create_packet_header_IPv4(self):
"""Create packet header: IPv4 header, UDP header
:param dst: IPv4 destination address
IPv4 source address is 123.1.1.1
IPv4 destination address is 124.1.1.1
UDP source port and destination port are 1234
"""
p = (IP(src='123.1.1.1', dst='124.1.1.1') /
UDP(sport=1234, dport=1234))
return p
def create_packet_header_IPv6_SRH_IPv4(self, sidlist, segleft):
"""Create packet header: IPv4 encapsulated in SRv6:
IPv6 header with SRH, IPv4 header, UDP header
:param ipv4address dst: inner IPv4 destination address
:param list sidlist: segment list of outer IPv6 SRH
:param int segleft: segments-left field of outer IPv6 SRH
Outer IPv6 destination address is set to sidlist[segleft]
IPv6 source address is 1234::1
IPv4 source address is 123.1.1.1
IPv4 destination address is 124.1.1.1
UDP source port and destination port are 1234
"""
p = (IPv6(src='1234::1', dst=sidlist[segleft]) /
IPv6ExtHdrSegmentRouting(addresses=sidlist,
segleft=segleft, nh=4) /
IP(src='123.1.1.1', dst='124.1.1.1') /
UDP(sport=1234, dport=1234))
return p
def create_packet_header_L2(self, vlan=0):
"""Create packet header: L2 header
:param vlan: if vlan!=0 then add 802.1q header
"""
# Note: the dst addr ('00:55:44:33:22:11') is used in
# the compare function compare_rx_tx_packet_T_Encaps_L2
# to detect presence of L2 in SRH payload
p = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11')
etype = 0x8137 # IPX
if vlan:
# add 802.1q layer
p /= Dot1Q(vlan=vlan, type=etype)
else:
p.type = etype
return p
def create_packet_header_IPv6_SRH_L2(self, sidlist, segleft, vlan=0):
"""Create packet header: L2 encapsulated in SRv6:
IPv6 header with SRH, L2
:param list sidlist: segment list of outer IPv6 SRH
:param int segleft: segments-left field of outer IPv6 SRH
:param vlan: L2 vlan; if vlan!=0 then add 802.1q header
Outer IPv6 destination address is set to sidlist[segleft]
IPv6 source address is 1234::1
"""
eth = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11')
etype = 0x8137 # IPX
if vlan:
# add 802.1q layer
eth /= Dot1Q(vlan=vlan, type=etype)
else:
eth.type = etype
p = (IPv6(src='1234::1', dst=sidlist[segleft]) /
IPv6ExtHdrSegmentRouting(addresses=sidlist,
segleft=segleft, nh=143) /
eth)
return p
def get_payload_info(self, packet):
""" Extract the payload_info from the packet
"""
# in most cases, payload_info is in packet[Raw]
# but packet[Raw] gives the complete payload
# (incl L2 header) for the T.Encaps L2 case
try:
payload_info = self.payload_to_info(packet[Raw])
except:
# remote L2 header from packet[Raw]:
# take packet[Raw], convert it to an Ether layer
# and then extract Raw from it
payload_info = self.payload_to_info(
Ether(scapy.compat.raw(packet[Raw]))[Raw])
return payload_info
def verify_captured_pkts(self, dst_if, capture, compare_func):
"""
Verify captured packet stream for specified interface.
Compare ingress with egress packets using the specified compare fn
:param dst_if: egress interface of DUT
:param capture: captured packets
:param compare_func: function to compare in and out packet
"""
self.logger.info("Verifying capture on interface %s using function %s"
% (dst_if.name, compare_func.__name__))
last_info = dict()
for i in self.pg_interfaces:
last_info[i.sw_if_index] = None
dst_sw_if_index = dst_if.sw_if_index
for packet in capture:
try:
# extract payload_info from packet's payload
payload_info = self.get_payload_info(packet)
packet_index = payload_info.index
self.logger.debug("Verifying packet with index %d"
% (packet_index))
# packet should have arrived on the expected interface
self.assertEqual(payload_info.dst, dst_sw_if_index)
self.logger.debug(
"Got packet on interface %s: src=%u (idx=%u)" %
(dst_if.name, payload_info.src, packet_index))
# search for payload_info with same src and dst if_index
# this will give us the transmitted packet
next_info = self.get_next_packet_info_for_interface2(
payload_info.src, dst_sw_if_index,
last_info[payload_info.src])
last_info[payload_info.src] = next_info
# next_info should not be None
self.assertTrue(next_info is not None)
# index of tx and rx packets should be equal
self.assertEqual(packet_index, next_info.index)
# data field of next_info contains the tx packet
txed_packet = next_info.data
self.logger.debug(ppp("Transmitted packet:",
txed_packet)) # ppp=Pretty Print Packet
self.logger.debug(ppp("Received packet:", packet))
# compare rcvd packet with expected packet using compare_func
compare_func(txed_packet, packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# have all expected packets arrived?
for i in self.pg_interfaces:
remaining_packet = self.get_next_packet_info_for_interface2(
i.sw_if_index, dst_sw_if_index, last_info[i.sw_if_index])
self.assertTrue(remaining_packet is None,
"Interface %s: Packet expected from interface %s "
"didn't arrive" % (dst_if.name, i.name))
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
