aboutsummaryrefslogtreecommitdiffstats
path: root/test/test_gre.py
blob: c28c04b988c762f180c94da04475d558279f7cdb (plain)
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
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
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
#!/usr/bin/env python3

import unittest

import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q, GRE
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from scapy.volatile import RandMAC, RandIP

from framework import VppTestCase, VppTestRunner
from vpp_sub_interface import L2_VTR_OP, VppDot1QSubint
from vpp_gre_interface import VppGreInterface
from vpp_nhrp import VppNhrp
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, FibPathProto
from util import ppp, ppc
from vpp_papi import VppEnum


class TestGREInputNodes(VppTestCase):
    """ GRE Input Nodes Test Case """

    def setUp(self):
        super(TestGREInputNodes, self).setUp()

        # create 3 pg interfaces - set one in a non-default table.
        self.create_pg_interfaces(range(1))

        for i in self.pg_interfaces:
            i.admin_up()
            i.config_ip4()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.admin_down()
        super(TestGREInputNodes, self).tearDown()

    def test_gre_input_node(self):
        """ GRE gre input nodes not registerd unless configured """
        pkt = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
               IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
               GRE())

        self.pg0.add_stream(pkt)
        self.pg_start()
        # no tunnel created, gre-input not registered
        err = self.statistics.get_counter(
            '/err/ip4-input/unknown ip protocol')[0]
        self.assertEqual(err, 1)
        err_count = err

        # create gre tunnel
        gre_if = VppGreInterface(self, self.pg0.local_ip4, "1.1.1.2")
        gre_if.add_vpp_config()

        self.pg0.add_stream(pkt)
        self.pg_start()
        # tunnel created, gre-input registered
        err = self.statistics.get_counter(
            '/err/ip4-input/unknown ip protocol')[0]
        # expect no new errors
        self.assertEqual(err, err_count)


class TestGRE(VppTestCase):
    """ GRE Test Case """

    @classmethod
    def setUpClass(cls):
        super(TestGRE, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        super(TestGRE, cls).tearDownClass()

    def setUp(self):
        super(TestGRE, self).setUp()

        # create 3 pg interfaces - set one in a non-default table.
        self.create_pg_interfaces(range(5))

        self.tbl = VppIpTable(self, 1)
        self.tbl.add_vpp_config()
        self.pg1.set_table_ip4(1)

        for i in self.pg_interfaces:
            i.admin_up()

        self.pg0.config_ip4()
        self.pg0.resolve_arp()
        self.pg1.config_ip4()
        self.pg1.resolve_arp()
        self.pg2.config_ip6()
        self.pg2.resolve_ndp()
        self.pg3.config_ip4()
        self.pg3.resolve_arp()
        self.pg4.config_ip4()
        self.pg4.resolve_arp()

    def tearDown(self):
        for i in self.pg_interfaces:
            i.unconfig_ip4()
            i.unconfig_ip6()
            i.admin_down()
        self.pg1.set_table_ip4(0)
        super(TestGRE, self).tearDown()

    def create_stream_ip4(self, src_if, src_ip, dst_ip):
        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_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_stream_ip6(self, src_if, src_ip, dst_ip):
        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) /
                 IPv6(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_tunnel_stream_4o4(self, src_if,
                                 tunnel_src, tunnel_dst,
                                 src_ip, dst_ip):
        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=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 IP(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_tunnel_stream_6o4(self, src_if,
                                 tunnel_src, tunnel_dst,
                                 src_ip, dst_ip):
        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=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 IPv6(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_tunnel_stream_6o6(self, src_if,
                                 tunnel_src, tunnel_dst,
                                 src_ip, dst_ip):
        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) /
                 IPv6(src=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 IPv6(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_tunnel_stream_l2o4(self, src_if,
                                  tunnel_src, tunnel_dst):
        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=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 Ether(dst=RandMAC('*:*:*:*:*:*'),
                       src=RandMAC('*:*:*:*:*:*')) /
                 IP(src=scapy.compat.raw(RandIP()),
                    dst=scapy.compat.raw(RandIP())) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def create_tunnel_stream_vlano4(self, src_if,
                                    tunnel_src, tunnel_dst, vlan):
        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=tunnel_src, dst=tunnel_dst) /
                 GRE() /
                 Ether(dst=RandMAC('*:*:*:*:*:*'),
                       src=RandMAC('*:*:*:*:*:*')) /
                 Dot1Q(vlan=vlan) /
                 IP(src=scapy.compat.raw(RandIP()),
                    dst=scapy.compat.raw(RandIP())) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            pkts.append(p)
        return pkts

    def verify_tunneled_4o4(self, src_if, capture, sent,
                            tunnel_src, tunnel_dst):

        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IP]
                rx_ip = rx[IP]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = rx[GRE]
                rx_ip = rx_gre[IP]

                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:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_tunneled_6o6(self, src_if, capture, sent,
                            tunnel_src, tunnel_dst):

        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IPv6]
                rx_ip = rx[IPv6]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = GRE(scapy.compat.raw(rx_ip[IPv6].payload))
                rx_ip = rx_gre[IPv6]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_tunneled_4o6(self, src_if, capture, sent,
                            tunnel_src, tunnel_dst):

        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                rx_ip = rx[IPv6]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = GRE(scapy.compat.raw(rx_ip[IPv6].payload))
                tx_ip = tx[IP]
                rx_ip = rx_gre[IP]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_tunneled_6o4(self, src_if, capture, sent,
                            tunnel_src, tunnel_dst):

        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                rx_ip = rx[IP]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = GRE(scapy.compat.raw(rx_ip[IP].payload))
                rx_ip = rx_gre[IPv6]
                tx_ip = tx[IPv6]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_tunneled_l2o4(self, src_if, capture, sent,
                             tunnel_src, tunnel_dst):
        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IP]
                rx_ip = rx[IP]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = rx[GRE]
                rx_l2 = rx_gre[Ether]
                rx_ip = rx_l2[IP]
                tx_gre = tx[GRE]
                tx_l2 = tx_gre[Ether]
                tx_ip = tx_l2[IP]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)
                # bridged, not L3 forwarded, so no TTL decrement
                self.assertEqual(rx_ip.ttl, tx_ip.ttl)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_tunneled_vlano4(self, src_if, capture, sent,
                               tunnel_src, tunnel_dst, vlan):
        try:
            self.assertEqual(len(capture), len(sent))
        except:
            ppc("Unexpected packets captured:", capture)
            raise

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IP]
                rx_ip = rx[IP]

                self.assertEqual(rx_ip.src, tunnel_src)
                self.assertEqual(rx_ip.dst, tunnel_dst)

                rx_gre = rx[GRE]
                rx_l2 = rx_gre[Ether]
                rx_vlan = rx_l2[Dot1Q]
                rx_ip = rx_l2[IP]

                self.assertEqual(rx_vlan.vlan, vlan)

                tx_gre = tx[GRE]
                tx_l2 = tx_gre[Ether]
                tx_ip = tx_l2[IP]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)
                # bridged, not L3 forwarded, so no TTL decrement
                self.assertEqual(rx_ip.ttl, tx_ip.ttl)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_decapped_4o4(self, src_if, capture, sent):
        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IP]
                rx_ip = rx[IP]
                tx_gre = tx[GRE]
                tx_ip = tx_gre[IP]

                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:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def verify_decapped_6o4(self, src_if, capture, sent):
        self.assertEqual(len(capture), len(sent))

        for i in range(len(capture)):
            try:
                tx = sent[i]
                rx = capture[i]

                tx_ip = tx[IP]
                rx_ip = rx[IPv6]
                tx_gre = tx[GRE]
                tx_ip = tx_gre[IPv6]

                self.assertEqual(rx_ip.src, tx_ip.src)
                self.assertEqual(rx_ip.dst, tx_ip.dst)
                self.assertEqual(rx_ip.hlim + 1, tx_ip.hlim)

            except:
                self.logger.error(ppp("Rx:", rx))
                self.logger.error(ppp("Tx:", tx))
                raise

    def test_gre(self):
        """ GRE IPv4 tunnel Tests """

        #
        # Create an L3 GRE tunnel.
        #  - set it admin up
        #  - assign an IP Addres
        #  - Add a route via the tunnel
        #
        gre_if = VppGreInterface(self,
                                 self.pg0.local_ip4,
                                 "1.1.1.2")
        gre_if.add_vpp_config()

        #
        # The double create (create the same tunnel twice) should fail,
        # and we should still be able to use the original
        #
        try:
            gre_if.add_vpp_config()
        except Exception:
            pass
        else:
            self.fail("Double GRE tunnel add does not fail")

        gre_if.admin_up()
        gre_if.config_ip4()

        route_via_tun = VppIpRoute(self, "4.4.4.4", 32,
                                   [VppRoutePath("0.0.0.0",
                                                 gre_if.sw_if_index)])

        route_via_tun.add_vpp_config()

        #
        # Send a packet stream that is routed into the tunnel
        #  - they are all dropped since the tunnel's destintation IP
        #    is unresolved - or resolves via the default route - which
        #    which is a drop.
        #
        tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "4.4.4.4")

        self.send_and_assert_no_replies(self.pg0, tx)

        #
        # Add a route that resolves the tunnel's destination
        #
        route_tun_dst = VppIpRoute(self, "1.1.1.2", 32,
                                   [VppRoutePath(self.pg0.remote_ip4,
                                                 self.pg0.sw_if_index)])
        route_tun_dst.add_vpp_config()

        #
        # Send a packet stream that is routed into the tunnel
        #  - packets are GRE encapped
        #
        tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "4.4.4.4")
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_tunneled_4o4(self.pg0, rx, tx,
                                 self.pg0.local_ip4, "1.1.1.2")

        #
        # Send tunneled packets that match the created tunnel and
        # are decapped and forwarded
        #
        tx = self.create_tunnel_stream_4o4(self.pg0,
                                           "1.1.1.2",
                                           self.pg0.local_ip4,
                                           self.pg0.local_ip4,
                                           self.pg0.remote_ip4)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_decapped_4o4(self.pg0, rx, tx)

        #
        # Send tunneled packets that do not match the tunnel's src
        #
        self.vapi.cli("clear trace")
        tx = self.create_tunnel_stream_4o4(self.pg0,
                                           "1.1.1.3",
                                           self.pg0.local_ip4,
                                           self.pg0.local_ip4,
                                           self.pg0.remote_ip4)
        self.send_and_assert_no_replies(
            self.pg0, tx,
            remark="GRE packets forwarded despite no SRC address match")

        #
        # Configure IPv6 on the PG interface so we can route IPv6
        # packets
        #
        self.pg0.config_ip6()
        self.pg0.resolve_ndp()

        #
        # Send IPv6 tunnel encapslated packets
        #  - dropped since IPv6 is not enabled on the tunnel
        #
        tx = self.create_tunnel_stream_6o4(self.pg0,
                                           "1.1.1.2",
                                           self.pg0.local_ip4,
                                           self.pg0.local_ip6,
                                           self.pg0.remote_ip6)
        self.send_and_assert_no_replies(self.pg0, tx,
                                        "IPv6 GRE packets forwarded "
                                        "despite IPv6 not enabled on tunnel")

        #
        # Enable IPv6 on the tunnel
        #
        gre_if.config_ip6()

        #
        # Send IPv6 tunnel encapslated packets
        #  - forwarded since IPv6 is enabled on the tunnel
        #
        tx = self.create_tunnel_stream_6o4(self.pg0,
                                           "1.1.1.2",
                                           self.pg0.local_ip4,
                                           self.pg0.local_ip6,
                                           self.pg0.remote_ip6)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_decapped_6o4(self.pg0, rx, tx)

        #
        # Send v6 packets for v4 encap
        #
        route6_via_tun = VppIpRoute(
            self, "2001::1", 128,
            [VppRoutePath("::",
                          gre_if.sw_if_index,
                          proto=DpoProto.DPO_PROTO_IP6)])
        route6_via_tun.add_vpp_config()

        tx = self.create_stream_ip6(self.pg0, "2001::2", "2001::1")
        rx = self.send_and_expect(self.pg0, tx, self.pg0)

        self.verify_tunneled_6o4(self.pg0, rx, tx,
                                 self.pg0.local_ip4, "1.1.1.2")

        #
        # test case cleanup
        #
        route_tun_dst.remove_vpp_config()
        route_via_tun.remove_vpp_config()
        route6_via_tun.remove_vpp_config()
        gre_if.remove_vpp_config()

        self.pg0.unconfig_ip6()

    def test_gre6(self):
        """ GRE IPv6 tunnel Tests """

        self.pg1.config_ip6()
        self.pg1.resolve_ndp()

        #
        # Create an L3 GRE tunnel.
        #  - set it admin up
        #  - assign an IP Address
        #  - Add a route via the tunnel
        #
        gre_if = VppGreInterface(self,
                                 self.pg2.local_ip6,
                                 "1002::1")
        gre_if.add_vpp_config()
        gre_if.admin_up()
        gre_if.config_ip6()

        route_via_tun = VppIpRoute(self, "4004::1", 128,
                                   [VppRoutePath("0::0",
                                                 gre_if.sw_if_index)])

        route_via_tun.add_vpp_config()

        #
        # Send a packet stream that is routed into the tunnel
        #  - they are all dropped since the tunnel's destintation IP
        #    is unresolved - or resolves via the default route - which
        #    which is a drop.
        #
        tx = self.create_stream_ip6(self.pg2, "5005::1", "4004::1")
        self.send_and_assert_no_replies(
            self.pg2, tx,
            "GRE packets forwarded without DIP resolved")

        #
        # Add a route that resolves the tunnel's destination
        #
        route_tun_dst = VppIpRoute(self, "1002::1", 128,
                                   [VppRoutePath(self.pg2.remote_ip6,
                                                 self.pg2.sw_if_index)])
        route_tun_dst.add_vpp_config()

        #
        # Send a packet stream that is routed into the tunnel
        #  - packets are GRE encapped
        #
        tx = self.create_stream_ip6(self.pg2, "5005::1", "4004::1")
        rx = self.send_and_expect(self.pg2, tx, self.pg2)
        self.verify_tunneled_6o6(self.pg2, rx, tx,
                                 self.pg2.local_ip6, "1002::1")

        #
        # Test decap. decapped packets go out pg1
        #
        tx = self.create_tunnel_stream_6o6(self.pg2,
                                           "1002::1",
                                           self.pg2.local_ip6,
                                           "2001::1",
                                           self.pg1.remote_ip6)
        rx = self.send_and_expect(self.pg2, tx, self.pg1)

        #
        # RX'd packet is UDP over IPv6, test the GRE header is gone.
        #
        self.assertFalse(rx[0].haslayer(GRE))
        self.assertEqual(rx[0][IPv6].dst, self.pg1.remote_ip6)

        #
        # Send v4 over v6
        #
        route4_via_tun = VppIpRoute(self, "1.1.1.1", 32,
                                    [VppRoutePath("0.0.0.0",
                                                  gre_if.sw_if_index)])
        route4_via_tun.add_vpp_config()

        tx = self.create_stream_ip4(self.pg0, "1.1.1.2", "1.1.1.1")
        rx = self.send_and_expect(self.pg0, tx, self.pg2)

        self.verify_tunneled_4o6(self.pg0, rx, tx,
                                 self.pg2.local_ip6, "1002::1")

        #
        # test case cleanup
        #
        route_tun_dst.remove_vpp_config()
        route_via_tun.remove_vpp_config()
        route4_via_tun.remove_vpp_config()
        gre_if.remove_vpp_config()

        self.pg2.unconfig_ip6()
        self.pg1.unconfig_ip6()

    def test_gre_vrf(self):
        """ GRE tunnel VRF Tests """

        #
        # Create an L3 GRE tunnel whose destination is in the non-default
        # table. The underlay is thus non-default - the overlay is still
        # the default.
        #  - set it admin up
        #  - assign an IP Addres
        #
        gre_if = VppGreInterface(self, self.pg1.local_ip4,
                                 "2.2.2.2",
                                 outer_table_id=1)
        gre_if.add_vpp_config()
        gre_if.admin_up()
        gre_if.config_ip4()

        #
        # Add a route via the tunnel - in the overlay
        #
        route_via_tun = VppIpRoute(self, "9.9.9.9", 32,
                                   [VppRoutePath("0.0.0.0",
                                                 gre_if.sw_if_index)])
        route_via_tun.add_vpp_config()

        #
        # Add a route that resolves the tunnel's destination - in the
        # underlay table
        #
        route_tun_dst = VppIpRoute(self, "2.2.2.2", 32, table_id=1,
                                   paths=[VppRoutePath(self.pg1.remote_ip4,
                                                       self.pg1.sw_if_index)])
        route_tun_dst.add_vpp_config()

        #
        # Send a packet stream that is routed into the tunnel
        # packets are sent in on pg0 which is in the default table
        #  - packets are GRE encapped
        #
        self.vapi.cli("clear trace")
        tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "9.9.9.9")
        rx = self.send_and_expect(self.pg0, tx, self.pg1)
        self.verify_tunneled_4o4(self.pg1, rx, tx,
                                 self.pg1.local_ip4, "2.2.2.2")

        #
        # Send tunneled packets that match the created tunnel and
        # are decapped and forwarded. This tests the decap lookup
        # does not happen in the encap table
        #
        self.vapi.cli("clear trace")
        tx = self.create_tunnel_stream_4o4(self.pg1,
                                           "2.2.2.2",
                                           self.pg1.local_ip4,
                                           self.pg0.local_ip4,
                                           self.pg0.remote_ip4)
        rx = self.send_and_expect(self.pg1, tx, self.pg0)
        self.verify_decapped_4o4(self.pg0, rx, tx)

        #
        # Send tunneled packets that match the created tunnel
        # but arrive on an interface that is not in the tunnel's
        # encap VRF, these are dropped.
        # IP enable the interface so they aren't dropped due to
        # IP not being enabled.
        #
        self.pg2.config_ip4()
        self.vapi.cli("clear trace")
        tx = self.create_tunnel_stream_4o4(self.pg2,
                                           "2.2.2.2",
                                           self.pg1.local_ip4,
                                           self.pg0.local_ip4,
                                           self.pg0.remote_ip4)
        rx = self.send_and_assert_no_replies(
            self.pg2, tx,
            "GRE decap packets in wrong VRF")

        self.pg2.unconfig_ip4()

        #
        # test case cleanup
        #
        route_tun_dst.remove_vpp_config()
        route_via_tun.remove_vpp_config()
        gre_if.remove_vpp_config()

    def test_gre_l2(self):
        """ GRE tunnel L2 Tests """

        #
        # Add routes to resolve the tunnel destinations
        #
        route_tun1_dst = VppIpRoute(self, "2.2.2.2", 32,
                                    [VppRoutePath(self.pg0.remote_ip4,
                                                  self.pg0.sw_if_index)])
        route_tun2_dst = VppIpRoute(self, "2.2.2.3", 32,
                                    [VppRoutePath(self.pg0.remote_ip4,
                                                  self.pg0.sw_if_index)])

        route_tun1_dst.add_vpp_config()
        route_tun2_dst.add_vpp_config()

        #
        # Create 2 L2 GRE tunnels and x-connect them
        #
        gre_if1 = VppGreInterface(self, self.pg0.local_ip4,
                                  "2.2.2.2",
                                  type=(VppEnum.vl_api_gre_tunnel_type_t.
                                        GRE_API_TUNNEL_TYPE_TEB))
        gre_if2 = VppGreInterface(self, self.pg0.local_ip4,
                                  "2.2.2.3",
                                  type=(VppEnum.vl_api_gre_tunnel_type_t.
                                        GRE_API_TUNNEL_TYPE_TEB))
        gre_if1.add_vpp_config()
        gre_if2.add_vpp_config()

        gre_if1.admin_up()
        gre_if2.admin_up()

        self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
                                               gre_if2.sw_if_index,
                                               enable=1)
        self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
                                               gre_if1.sw_if_index,
                                               enable=1)

        #
        # Send in tunnel encapped L2. expect out tunnel encapped L2
        # in both directions
        #
        tx = self.create_tunnel_stream_l2o4(self.pg0,
                                            "2.2.2.2",
                                            self.pg0.local_ip4)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_tunneled_l2o4(self.pg0, rx, tx,
                                  self.pg0.local_ip4,
                                  "2.2.2.3")

        tx = self.create_tunnel_stream_l2o4(self.pg0,
                                            "2.2.2.3",
                                            self.pg0.local_ip4)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_tunneled_l2o4(self.pg0, rx, tx,
                                  self.pg0.local_ip4,
                                  "2.2.2.2")

        self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
                                               gre_if2.sw_if_index,
                                               enable=0)
        self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
                                               gre_if1.sw_if_index,
                                               enable=0)

        #
        # Create a VLAN sub-interfaces on the GRE TEB interfaces
        # then x-connect them
        #
        gre_if_11 = VppDot1QSubint(self, gre_if1, 11)
        gre_if_12 = VppDot1QSubint(self, gre_if2, 12)

        # gre_if_11.add_vpp_config()
        # gre_if_12.add_vpp_config()

        gre_if_11.admin_up()
        gre_if_12.admin_up()

        self.vapi.sw_interface_set_l2_xconnect(gre_if_11.sw_if_index,
                                               gre_if_12.sw_if_index,
                                               enable=1)
        self.vapi.sw_interface_set_l2_xconnect(gre_if_12.sw_if_index,
                                               gre_if_11.sw_if_index,
                                               enable=1)

        #
        # Configure both to pop thier respective VLAN tags,
        # so that during the x-coonect they will subsequently push
        #
        self.vapi.l2_interface_vlan_tag_rewrite(
            sw_if_index=gre_if_12.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
            push_dot1q=12)
        self.vapi.l2_interface_vlan_tag_rewrite(
            sw_if_index=gre_if_11.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
            push_dot1q=11)

        #
        # Send traffic in both directiond - expect the VLAN tags to
        # be swapped.
        #
        tx = self.create_tunnel_stream_vlano4(self.pg0,
                                              "2.2.2.2",
                                              self.pg0.local_ip4,
                                              11)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_tunneled_vlano4(self.pg0, rx, tx,
                                    self.pg0.local_ip4,
                                    "2.2.2.3",
                                    12)

        tx = self.create_tunnel_stream_vlano4(self.pg0,
                                              "2.2.2.3",
                                              self.pg0.local_ip4,
                                              12)
        rx = self.send_and_expect(self.pg0, tx, self.pg0)
        self.verify_tunneled_vlano4(self.pg0, rx, tx,
                                    self.pg0.local_ip4,
                                    "2.2.2.2",
                                    11)

        #
        # Cleanup Test resources
        #
        gre_if_11.remove_vpp_config()
        gre_if_12.remove_vpp_config()
        gre_if1.remove_vpp_config()
        gre_if2.remove_vpp_config()
        route_tun1_dst.add_vpp_config()
        route_tun2_dst.add_vpp_config()

    def test_gre_loop(self):
        """ GRE tunnel loop Tests """

        #
        # Create an L3 GRE tunnel.
        #  - set it admin up
        #  - assign an IP Addres
        #
        gre_if = VppGreInterface(self,
                                 self.pg0.local_ip4,
                                 "1.1.1.2")
        gre_if.add_vpp_config()
        gre_if.admin_up()
        gre_if.config_ip4()

        #
        # add a route to the tunnel's destination that points
        # through the tunnel, hence forming a loop in the forwarding
        # graph
        #
        route_dst = VppIpRoute(self, "1.1.1.2", 32,
                               [VppRoutePath("0.0.0.0",
                                             gre_if.sw_if_index)])
        route_dst.add_vpp_config()

        #
        # packets to the tunnels destination should be dropped
        #
        tx = self.create_stream_ip4(self.pg0, "1.1.1.1", "1.1.1.2")
        self.send_and_assert_no_replies(self.pg2, tx)

        self.logger.info(self.vapi.ppcli("sh adj 7"))

        #
        # break the loop
        #
        route_dst.modify([VppRoutePath(self.pg1.remote_ip4,
                                       self.pg1.sw_if_index)])
        route_dst.add_vpp_config()

        rx = self.send_and_expect(self.pg0, tx, self.pg1)

        #
        # a good route throught the tunnel to check it restacked
        #
        route_via_tun_2 = VppIpRoute(self, "2.2.2.2", 32,
                                     [VppRoutePath("0.0.0.0",
                                                   gre_if.sw_if_index)])
        route_via_tun_2.add_vpp_config()

        tx = self.create_stream_ip4(self.pg0, "2.2.2.3", "2.2.2.2")
        rx = self.send_and_expect(self.pg0, tx, self.pg1)
        self.verify_tunneled_4o4(self.pg1, rx, tx,
                                 self.pg0.local_ip4, "1.1.1.2")

        #
        # cleanup
        #
        route_via_tun_2.remove_vpp_config()
        gre_if.remove_vpp_config()

    def test_mgre(self):
        """ mGRE IPv4 tunnel Tests """

        for itf in self.pg_interfaces[3:]:
            #
            # one underlay nh for each overlay/tunnel peer
            #
            itf.generate_remote_hosts(4)
            itf.configure_ipv4_neighbors()

            #
            # Create an L3 GRE tunnel.
            #  - set it admin up
            #  - assign an IP Addres
            #  - Add a route via the tunnel
            #
            gre_if = VppGreInterface(self,
                                     itf.local_ip4,
                                     "0.0.0.0",
                                     mode=(VppEnum.vl_api_gre_tunnel_mode_t.
                                           GRE_API_TUNNEL_MODE_MP))
            gre_if.add_vpp_config()
            gre_if.admin_up()
            gre_if.config_ip4()
            gre_if.generate_remote_hosts(4)

            self.logger.info(self.vapi.cli("sh adj"))
            self.logger.info(self.vapi.cli("sh ip fib"))

            #
            # for-each peer
            #
            for ii in range(1, 4):
                route_addr = "4.4.4.%d" % ii

                #
                # route traffic via the peer
                #
                route_via_tun = VppIpRoute(
                    self, route_addr, 32,
                    [VppRoutePath(gre_if._remote_hosts[ii].ip4,
                                  gre_if.sw_if_index)])
                route_via_tun.add_vpp_config()

                #
                # Add a NHRP entry resolves the peer
                #
                nhrp = VppNhrp(self, gre_if,
                               gre_if._remote_hosts[ii].ip4,
                               itf._remote_hosts[ii].ip4)
                nhrp.add_vpp_config()

                #
                # Send a packet stream that is routed into the tunnel
                #  - packets are GRE encapped
                #
                tx = self.create_stream_ip4(self.pg0, "5.5.5.5", route_addr)
                rx = self.send_and_expect(self.pg0, tx, itf)
                self.verify_tunneled_4o4(self.pg0, rx, tx,
                                         itf.local_ip4,
                                         gre_if._remote_hosts[ii].ip4)

                #
                # delete and re-add the NHRP
                #
                nhrp.remove_vpp_config()
                self.send_and_assert_no_replies(self.pg0, tx)

                nhrp.add_vpp_config()
                rx = self.send_and_expect(self.pg0, tx, itf)
                self.verify_tunneled_4o4(self.pg0, rx, tx,
                                         itf.local_ip4,
                                         gre_if._remote_hosts[ii].ip4)

            gre_if.admin_down()
            gre_if.unconfig_ip4()


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)