aboutsummaryrefslogtreecommitdiffstats
path: root/test/template_ipsec.py
blob: 25cff7f2edf161e7d2b5c106c69ad44ae9185f46 (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
import unittest
import socket
import struct

from scapy.layers.inet import IP, ICMP, TCP, UDP
from scapy.layers.ipsec import SecurityAssociation, ESP
from scapy.layers.l2 import Ether, Raw
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest

from framework import VppTestCase, VppTestRunner
from util import ppp, reassemble4
from vpp_papi import VppEnum


class IPsecIPv4Params(object):

    addr_type = socket.AF_INET
    addr_any = "0.0.0.0"
    addr_bcast = "255.255.255.255"
    addr_len = 32
    is_ipv6 = 0

    def __init__(self):
        self.remote_tun_if_host = '1.1.1.1'
        self.remote_tun_if_host6 = '1111::1'

        self.scapy_tun_sa_id = 10
        self.scapy_tun_spi = 1001
        self.vpp_tun_sa_id = 20
        self.vpp_tun_spi = 1000

        self.scapy_tra_sa_id = 30
        self.scapy_tra_spi = 2001
        self.vpp_tra_sa_id = 40
        self.vpp_tra_spi = 2000

        self.auth_algo_vpp_id = (VppEnum.vl_api_ipsec_integ_alg_t.
                                 IPSEC_API_INTEG_ALG_SHA1_96)
        self.auth_algo = 'HMAC-SHA1-96'  # scapy name
        self.auth_key = 'C91KUR9GYMm5GfkEvNjX'

        self.crypt_algo_vpp_id = (VppEnum.vl_api_ipsec_crypto_alg_t.
                                  IPSEC_API_CRYPTO_ALG_AES_CBC_128)
        self.crypt_algo = 'AES-CBC'  # scapy name
        self.crypt_key = 'JPjyOWBeVEQiMe7h'
        self.salt = 0
        self.flags = 0
        self.nat_header = None


class IPsecIPv6Params(object):

    addr_type = socket.AF_INET6
    addr_any = "0::0"
    addr_bcast = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
    addr_len = 128
    is_ipv6 = 1

    def __init__(self):
        self.remote_tun_if_host = '1111:1111:1111:1111:1111:1111:1111:1111'
        self.remote_tun_if_host4 = '1.1.1.1'

        self.scapy_tun_sa_id = 50
        self.scapy_tun_spi = 3001
        self.vpp_tun_sa_id = 60
        self.vpp_tun_spi = 3000

        self.scapy_tra_sa_id = 70
        self.scapy_tra_spi = 4001
        self.vpp_tra_sa_id = 80
        self.vpp_tra_spi = 4000

        self.auth_algo_vpp_id = (VppEnum.vl_api_ipsec_integ_alg_t.
                                 IPSEC_API_INTEG_ALG_SHA1_96)
        self.auth_algo = 'HMAC-SHA1-96'  # scapy name
        self.auth_key = 'C91KUR9GYMm5GfkEvNjX'

        self.crypt_algo_vpp_id = (VppEnum.vl_api_ipsec_crypto_alg_t.
                                  IPSEC_API_CRYPTO_ALG_AES_CBC_128)
        self.crypt_algo = 'AES-CBC'  # scapy name
        self.crypt_key = 'JPjyOWBeVEQiMe7h'
        self.salt = 0
        self.flags = 0
        self.nat_header = None


def mk_scapy_crpyt_key(p):
    if p.crypt_algo == "AES-GCM":
        return p.crypt_key + struct.pack("!I", p.salt)
    else:
        return p.crypt_key


def config_tun_params(p, encryption_type, tun_if):
    ip_class_by_addr_type = {socket.AF_INET: IP, socket.AF_INET6: IPv6}
    use_esn = bool(p.flags & (VppEnum.vl_api_ipsec_sad_flags_t.
                              IPSEC_API_SAD_FLAG_USE_ESN))
    crypt_key = mk_scapy_crpyt_key(p)
    p.scapy_tun_sa = SecurityAssociation(
        encryption_type, spi=p.vpp_tun_spi,
        crypt_algo=p.crypt_algo,
        crypt_key=crypt_key,
        auth_algo=p.auth_algo, auth_key=p.auth_key,
        tunnel_header=ip_class_by_addr_type[p.addr_type](
            src=tun_if.remote_addr[p.addr_type],
            dst=tun_if.local_addr[p.addr_type]),
        nat_t_header=p.nat_header,
        use_esn=use_esn)
    p.vpp_tun_sa = SecurityAssociation(
        encryption_type, spi=p.scapy_tun_spi,
        crypt_algo=p.crypt_algo,
        crypt_key=crypt_key,
        auth_algo=p.auth_algo, auth_key=p.auth_key,
        tunnel_header=ip_class_by_addr_type[p.addr_type](
            dst=tun_if.remote_addr[p.addr_type],
            src=tun_if.local_addr[p.addr_type]),
        nat_t_header=p.nat_header,
        use_esn=use_esn)


def config_tra_params(p, encryption_type):
    use_esn = bool(p.flags & (VppEnum.vl_api_ipsec_sad_flags_t.
                              IPSEC_API_SAD_FLAG_USE_ESN))
    crypt_key = mk_scapy_crpyt_key(p)
    p.scapy_tra_sa = SecurityAssociation(
        encryption_type,
        spi=p.vpp_tra_spi,
        crypt_algo=p.crypt_algo,
        crypt_key=crypt_key,
        auth_algo=p.auth_algo,
        auth_key=p.auth_key,
        nat_t_header=p.nat_header,
        use_esn=use_esn)
    p.vpp_tra_sa = SecurityAssociation(
        encryption_type,
        spi=p.scapy_tra_spi,
        crypt_algo=p.crypt_algo,
        crypt_key=crypt_key,
        auth_algo=p.auth_algo,
        auth_key=p.auth_key,
        nat_t_header=p.nat_header,
        use_esn=use_esn)


class TemplateIpsec(VppTestCase):
    """
    TRANSPORT MODE:

     ------   encrypt   ---
    |tra_if| <-------> |VPP|
     ------   decrypt   ---

    TUNNEL MODE:

     ------   encrypt   ---   plain   ---
    |tun_if| <-------  |VPP| <------ |pg1|
     ------             ---           ---

     ------   decrypt   ---   plain   ---
    |tun_if| ------->  |VPP| ------> |pg1|
     ------             ---           ---
    """
    tun_spd_id = 1
    tra_spd_id = 2

    def ipsec_select_backend(self):
        """ empty method to be overloaded when necessary """
        pass

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

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

    def setup_params(self):
        self.ipv4_params = IPsecIPv4Params()
        self.ipv6_params = IPsecIPv6Params()
        self.params = {self.ipv4_params.addr_type: self.ipv4_params,
                       self.ipv6_params.addr_type: self.ipv6_params}

    def config_interfaces(self):
        self.create_pg_interfaces(range(3))
        self.interfaces = list(self.pg_interfaces)
        for i in self.interfaces:
            i.admin_up()
            i.config_ip4()
            i.resolve_arp()
            i.config_ip6()
            i.resolve_ndp()

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

        self.setup_params()

        self.vpp_esp_protocol = (VppEnum.vl_api_ipsec_proto_t.
                                 IPSEC_API_PROTO_ESP)
        self.vpp_ah_protocol = (VppEnum.vl_api_ipsec_proto_t.
                                IPSEC_API_PROTO_AH)

        self.config_interfaces()

        self.ipsec_select_backend()

    def unconfig_interfaces(self):
        for i in self.interfaces:
            i.admin_down()
            i.unconfig_ip4()
            i.unconfig_ip6()

    def tearDown(self):
        super(TemplateIpsec, self).tearDown()

        self.unconfig_interfaces()

    def show_commands_at_teardown(self):
        self.logger.info(self.vapi.cli("show hardware"))

    def gen_encrypt_pkts(self, sa, sw_intf, src, dst, count=1,
                         payload_size=54):
        return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                sa.encrypt(IP(src=src, dst=dst) /
                           ICMP() / Raw('X' * payload_size))
                for i in range(count)]

    def gen_encrypt_pkts6(self, sa, sw_intf, src, dst, count=1,
                          payload_size=54):
        return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                sa.encrypt(IPv6(src=src, dst=dst) /
                           ICMPv6EchoRequest(id=0, seq=1,
                                             data='X' * payload_size))
                for i in range(count)]

    def gen_pkts(self, sw_intf, src, dst, count=1, payload_size=54):
        return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                IP(src=src, dst=dst) / ICMP() / Raw('X' * payload_size)
                for i in range(count)]

    def gen_pkts6(self, sw_intf, src, dst, count=1, payload_size=54):
        return [Ether(src=sw_intf.remote_mac, dst=sw_intf.local_mac) /
                IPv6(src=src, dst=dst) /
                ICMPv6EchoRequest(id=0, seq=1, data='X' * payload_size)
                for i in range(count)]


class IpsecTcp(object):
    def verify_tcp_checksum(self):
        self.vapi.cli("test http server")
        p = self.params[socket.AF_INET]
        config_tun_params(p, self.encryption_type, self.tun_if)
        send = (Ether(src=self.tun_if.remote_mac, dst=self.tun_if.local_mac) /
                p.scapy_tun_sa.encrypt(IP(src=p.remote_tun_if_host,
                                          dst=self.tun_if.local_ip4) /
                                       TCP(flags='S', dport=80)))
        self.logger.debug(ppp("Sending packet:", send))
        recv = self.send_and_expect(self.tun_if, [send], self.tun_if)
        recv = recv[0]
        decrypted = p.vpp_tun_sa.decrypt(recv[IP])
        self.assert_packet_checksums_valid(decrypted)


class IpsecTcpTests(IpsecTcp):
    def test_tcp_checksum(self):
        """ verify checksum correctness for vpp generated packets """
        self.verify_tcp_checksum()


class IpsecTra4(object):
    """ verify methods for Transport v4 """
    def verify_tra_anti_replay(self):
        p = self.params[socket.AF_INET]
        use_esn = p.vpp_tra_sa.use_esn

        seq_cycle_node_name = ('/err/%s/sequence number cycled' %
                               self.tra4_encrypt_node_name)
        replay_node_name = ('/err/%s/SA replayed packet' %
                            self.tra4_decrypt_node_name)
        if ESP == self.encryption_type and p.crypt_algo == "AES-GCM":
            hash_failed_node_name = ('/err/%s/ESP decryption failed' %
                                     self.tra4_decrypt_node_name)
        else:
            hash_failed_node_name = ('/err/%s/Integrity check failed' %
                                     self.tra4_decrypt_node_name)
        replay_count = self.statistics.get_err_counter(replay_node_name)
        hash_failed_count = self.statistics.get_err_counter(
            hash_failed_node_name)
        seq_cycle_count = self.statistics.get_err_counter(seq_cycle_node_name)

        if ESP == self.encryption_type:
            undersize_node_name = ('/err/%s/undersized packet' %
                                   self.tra4_decrypt_node_name)
            undersize_count = self.statistics.get_err_counter(
                undersize_node_name)

        #
        # send packets with seq numbers 1->34
        # this means the window size is still in Case B (see RFC4303
        # Appendix A)
        #
        # for reasons i haven't investigated Scapy won't create a packet with
        # seq_num=0
        #
        pkts = [(Ether(src=self.tra_if.remote_mac,
                       dst=self.tra_if.local_mac) /
                 p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                           dst=self.tra_if.local_ip4) /
                                        ICMP(),
                                        seq_num=seq))
                for seq in range(1, 34)]
        recv_pkts = self.send_and_expect(self.tra_if, pkts, self.tra_if)

        # replayed packets are dropped
        self.send_and_assert_no_replies(self.tra_if, pkts)
        replay_count += len(pkts)
        self.assert_error_counter_equal(replay_node_name, replay_count)

        #
        # now move the window over to 257 (more than one byte) and into Case A
        #
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                         dst=self.tra_if.local_ip4) /
                                      ICMP(),
                                      seq_num=257))
        recv_pkts = self.send_and_expect(self.tra_if, [pkt], self.tra_if)

        # replayed packets are dropped
        self.send_and_assert_no_replies(self.tra_if, pkt * 3)
        replay_count += 3
        self.assert_error_counter_equal(replay_node_name, replay_count)

        # the window size is 64 packets
        # in window are still accepted
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                         dst=self.tra_if.local_ip4) /
                                      ICMP(),
                                      seq_num=200))
        recv_pkts = self.send_and_expect(self.tra_if, [pkt], self.tra_if)

        # a packet that does not decrypt does not move the window forward
        bogus_sa = SecurityAssociation(self.encryption_type,
                                       p.vpp_tra_spi,
                                       crypt_algo=p.crypt_algo,
                                       crypt_key=mk_scapy_crpyt_key(p)[::-1],
                                       auth_algo=p.auth_algo,
                                       auth_key=p.auth_key[::-1])
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               bogus_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                   dst=self.tra_if.local_ip4) /
                                ICMP(),
                                seq_num=350))
        self.send_and_assert_no_replies(self.tra_if, pkt * 17)

        hash_failed_count += 17
        self.assert_error_counter_equal(hash_failed_node_name,
                                        hash_failed_count)

        # a malformed 'runt' packet
        #  created by a mis-constructed SA
        if (ESP == self.encryption_type):
            bogus_sa = SecurityAssociation(self.encryption_type,
                                           p.vpp_tra_spi)
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   bogus_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                       dst=self.tra_if.local_ip4) /
                                    ICMP(),
                                    seq_num=350))
            self.send_and_assert_no_replies(self.tra_if, pkt * 17)

            undersize_count += 17
            self.assert_error_counter_equal(undersize_node_name,
                                            undersize_count)

        # which we can determine since this packet is still in the window
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                         dst=self.tra_if.local_ip4) /
                                      ICMP(),
                                      seq_num=234))
        self.send_and_expect(self.tra_if, [pkt], self.tra_if)

        #
        # out of window are dropped
        #  this is Case B. So VPP will consider this to be a high seq num wrap
        #  and so the decrypt attempt will fail
        #
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                         dst=self.tra_if.local_ip4) /
                                      ICMP(),
                                      seq_num=17))
        self.send_and_assert_no_replies(self.tra_if, pkt * 17)

        if use_esn:
            # an out of window error with ESN looks like a high sequence
            # wrap. but since it isn't then the verify will fail.
            hash_failed_count += 17
            self.assert_error_counter_equal(hash_failed_node_name,
                                            hash_failed_count)

        else:
            replay_count += 17
            self.assert_error_counter_equal(replay_node_name,
                                            replay_count)

        # valid packet moves the window over to 258
        pkt = (Ether(src=self.tra_if.remote_mac,
                     dst=self.tra_if.local_mac) /
               p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                         dst=self.tra_if.local_ip4) /
                                      ICMP(),
                                      seq_num=258))
        rx = self.send_and_expect(self.tra_if, [pkt], self.tra_if)
        decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

        #
        # move VPP's SA TX seq-num to just before the seq-number wrap.
        # then fire in a packet that VPP should drop on TX because it
        # causes the TX seq number to wrap; unless we're using extened sequence
        # numbers.
        #
        self.vapi.cli("test ipsec sa %d seq 0xffffffff" % p.scapy_tra_sa_id)
        self.logger.info(self.vapi.ppcli("show ipsec sa 0"))
        self.logger.info(self.vapi.ppcli("show ipsec sa 1"))

        pkts = [(Ether(src=self.tra_if.remote_mac,
                       dst=self.tra_if.local_mac) /
                 p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                           dst=self.tra_if.local_ip4) /
                                        ICMP(),
                                        seq_num=seq))
                for seq in range(259, 280)]

        if use_esn:
            rxs = self.send_and_expect(self.tra_if, pkts, self.tra_if)

            #
            # in order for scapy to decrypt its SA's high order number needs
            # to wrap
            #
            p.vpp_tra_sa.seq_num = 0x100000000
            for rx in rxs:
                decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

            #
            # wrap scapy's TX high sequence number. VPP is in case B, so it
            # will consider this a high seq wrap also.
            # The low seq num we set it to will place VPP's RX window in Case A
            #
            p.scapy_tra_sa.seq_num = 0x100000005
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                             dst=self.tra_if.local_ip4) /
                                          ICMP(),
                                          seq_num=0x100000005))
            rx = self.send_and_expect(self.tra_if, [pkt], self.tra_if)
            decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

            #
            # A packet that has seq num between (2^32-64) and 5 is within
            # the window
            #
            p.scapy_tra_sa.seq_num = 0xfffffffd
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                             dst=self.tra_if.local_ip4) /
                                          ICMP(),
                                          seq_num=0xfffffffd))
            rx = self.send_and_expect(self.tra_if, [pkt], self.tra_if)
            decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

            #
            # While in case A we cannot wrap the high sequence number again
            # becuase VPP will consider this packet to be one that moves the
            # window forward
            #
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                             dst=self.tra_if.local_ip4) /
                                          ICMP(),
                                          seq_num=0x200000999))
            self.send_and_assert_no_replies(self.tra_if, [pkt], self.tra_if)

            hash_failed_count += 1
            self.assert_error_counter_equal(hash_failed_node_name,
                                            hash_failed_count)

            #
            # but if we move the wondow forward to case B, then we can wrap
            # again
            #
            p.scapy_tra_sa.seq_num = 0x100000555
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                             dst=self.tra_if.local_ip4) /
                                          ICMP(),
                                          seq_num=0x100000555))
            rx = self.send_and_expect(self.tra_if, [pkt], self.tra_if)
            decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

            p.scapy_tra_sa.seq_num = 0x200000444
            pkt = (Ether(src=self.tra_if.remote_mac,
                         dst=self.tra_if.local_mac) /
                   p.scapy_tra_sa.encrypt(IP(src=self.tra_if.remote_ip4,
                                             dst=self.tra_if.local_ip4) /
                                          ICMP(),
                                          seq_num=0x200000444))
            rx = self.send_and_expect(self.tra_if, [pkt], self.tra_if)
            decrypted = p.vpp_tra_sa.decrypt(rx[0][IP])

        else:
            #
            # without ESN TX sequence numbers can't wrap and packets are
            # dropped from here on out.
            #
            self.send_and_assert_no_replies(self.tra_if, pkts)
            seq_cycle_count += len(pkts)
            self.assert_error_counter_equal(seq_cycle_node_name,
                                            seq_cycle_count)

        # move the security-associations seq number on to the last we used
        self.vapi.cli("test ipsec sa %d seq 0x15f" % p.scapy_tra_sa_id)
        p.scapy_tra_sa.seq_num = 351
        p.vpp_tra_sa.seq_num = 351

    def verify_tra_basic4(self, count=1):
        """ ipsec v4 transport basic test """
        self.vapi.cli("clear errors")
        self.vapi.cli("clear ipsec sa")
        try:
            p = self.params[socket.AF_INET]
            send_pkts = self.gen_encrypt_pkts(p.scapy_tra_sa, self.tra_if,
                                              src=self.tra_if.remote_ip4,
                                              dst=self.tra_if.local_ip4,
                                              count=count)
            recv_pkts = self.send_and_expect(self.tra_if, send_pkts,
                                             self.tra_if)
            for rx in recv_pkts:
                self.assertEqual(len(rx) - len(Ether()), rx[IP].len)
                self.assert_packet_checksums_valid(rx)
                try:
                    decrypted = p.vpp_tra_sa.decrypt(rx[IP])
                    self.assert_packet_checksums_valid(decrypted)
                except:
                    self.logger.debug(ppp("Unexpected packet:", rx))
                    raise
        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))

        pkts = p.tra_sa_in.get_stats()['packets']
        self.assertEqual(pkts, count,
                         "incorrect SA in counts: expected %d != %d" %
                         (count, pkts))
        pkts = p.tra_sa_out.get_stats()['packets']
        self.assertEqual(pkts, count,
                         "incorrect SA out counts: expected %d != %d" %
                         (count, pkts))

        self.assert_packet_counter_equal(self.tra4_encrypt_node_name, count)
        self.assert_packet_counter_equal(self.tra4_decrypt_node_name, count)


class IpsecTra4Tests(IpsecTra4):
    """ UT test methods for Transport v4 """
    def test_tra_anti_replay(self):
        """ ipsec v4 transport anti-reply test """
        self.verify_tra_anti_replay()

    def test_tra_basic(self, count=1):
        """ ipsec v4 transport basic test """
        self.verify_tra_basic4(count=1)

    def test_tra_burst(self):
        """ ipsec v4 transport burst test """
        self.verify_tra_basic4(count=257)


class IpsecTra6(object):
    """ verify methods for Transport v6 """
    def verify_tra_basic6(self, count=1):
        self.vapi.cli("clear errors")
        try:
            p = self.params[socket.AF_INET6]
            send_pkts = self.gen_encrypt_pkts6(p.scapy_tra_sa, self.tra_if,
                                               src=self.tra_if.remote_ip6,
                                               dst=self.tra_if.local_ip6,
                                               count=count)
            recv_pkts = self.send_and_expect(self.tra_if, send_pkts,
                                             self.tra_if)
            for rx in recv_pkts:
                self.assertEqual(len(rx) - len(Ether()) - len(IPv6()),
                                 rx[IPv6].plen)
                try:
                    decrypted = p.vpp_tra_sa.decrypt(rx[IPv6])
                    self.assert_packet_checksums_valid(decrypted)
                except:
                    self.logger.debug(ppp("Unexpected packet:", rx))
                    raise
        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))

        pkts = p.tra_sa_in.get_stats()['packets']
        self.assertEqual(pkts, count,
                         "incorrect SA in counts: expected %d != %d" %
                         (count, pkts))
        pkts = p.tra_sa_out.get_stats()['packets']
        self.assertEqual(pkts, count,
                         "incorrect SA out counts: expected %d != %d" %
                         (count, pkts))
        self.assert_packet_counter_equal(self.tra6_encrypt_node_name, count)
        self.assert_packet_counter_equal(self.tra6_decrypt_node_name, count)


class IpsecTra6Tests(IpsecTra6):
    """ UT test methods for Transport v6 """
    def test_tra_basic6(self):
        """ ipsec v6 transport basic test """
        self.verify_tra_basic6(count=1)

    def test_tra_burst6(self):
        """ ipsec v6 transport burst test """
        self.verify_tra_basic6(count=257)


class IpsecTra46Tests(IpsecTra4Tests, IpsecTra6Tests):
    """ UT test methods for Transport v6 and v4"""
    pass


class IpsecTun4(object):
    """ verify methods for Tunnel v4 """
    def verify_counters4(self, p, count, n_frags=None):
        if not n_frags:
            n_frags = count
        if (hasattr(p, "spd_policy_in_any")):
            pkts = p.spd_policy_in_any.get_stats()['packets']
            self.assertEqual(pkts, count,
                             "incorrect SPD any policy: expected %d != %d" %
                             (count, pkts))

        if (hasattr(p, "tun_sa_in")):
            pkts = p.tun_sa_in.get_stats()['packets']
            self.assertEqual(pkts, count,
                             "incorrect SA in counts: expected %d != %d" %
                             (count, pkts))
            pkts = p.tun_sa_out.get_stats()['packets']
            self.assertEqual(pkts, count,
                             "incorrect SA out counts: expected %d != %d" %
                             (count, pkts))

        self.assert_packet_counter_equal(self.tun4_encrypt_node_name, n_frags)
        self.assert_packet_counter_equal(self.tun4_decrypt_node_name, count)

    def verify_decrypted(self, p, rxs):
        for rx in rxs:
            self.assert_equal(rx[IP].src, p.remote_tun_if_host)
            self.assert_equal(rx[IP].dst, self.pg1.remote_ip4)
            self.assert_packet_checksums_valid(rx)

    def verify_encrypted(self, p, sa, rxs):
        decrypt_pkts = []
        for rx in rxs:
            if p.nat_header:
                self.assertEqual(rx[UDP].dport, 4500)
            self.assert_packet_checksums_valid(rx)
            self.assertEqual(len(rx) - len(Ether()), rx[IP].len)
            try:
                decrypt_pkt = p.vpp_tun_sa.decrypt(rx[IP])
                if not decrypt_pkt.haslayer(IP):
                    decrypt_pkt = IP(decrypt_pkt[Raw].load)
                decrypt_pkts.append(decrypt_pkt)
                self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip4)
                self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host)
            except:
                self.logger.debug(ppp("Unexpected packet:", rx))
                try:
                    self.logger.debug(ppp("Decrypted packet:", decrypt_pkt))
                except:
                    pass
                raise
        pkts = reassemble4(decrypt_pkts)
        for pkt in pkts:
            self.assert_packet_checksums_valid(pkt)

    def verify_tun_44(self, p, count=1, payload_size=64, n_rx=None):
        self.vapi.cli("clear errors")
        if not n_rx:
            n_rx = count
        try:
            config_tun_params(p, self.encryption_type, self.tun_if)
            send_pkts = self.gen_encrypt_pkts(p.scapy_tun_sa, self.tun_if,
                                              src=p.remote_tun_if_host,
                                              dst=self.pg1.remote_ip4,
                                              count=count)
            recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1)
            self.verify_decrypted(p, recv_pkts)

            send_pkts = self.gen_pkts(self.pg1, src=self.pg1.remote_ip4,
                                      dst=p.remote_tun_if_host, count=count,
                                      payload_size=payload_size)
            recv_pkts = self.send_and_expect(self.pg1, send_pkts,
                                             self.tun_if, n_rx)
            self.verify_encrypted(p, p.vpp_tun_sa, recv_pkts)

        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))

        self.verify_counters4(p, count, n_rx)

    def verify_tun_64(self, p, count=1):
        self.vapi.cli("clear errors")
        try:
            config_tun_params(p, self.encryption_type, self.tun_if)
            send_pkts = self.gen_encrypt_pkts6(p.scapy_tun_sa, self.tun_if,
                                               src=p.remote_tun_if_host6,
                                               dst=self.pg1.remote_ip6,
                                               count=count)
            recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1)
            for recv_pkt in recv_pkts:
                self.assert_equal(recv_pkt[IPv6].src, p.remote_tun_if_host6)
                self.assert_equal(recv_pkt[IPv6].dst, self.pg1.remote_ip6)
                self.assert_packet_checksums_valid(recv_pkt)
            send_pkts = self.gen_pkts6(self.pg1, src=self.pg1.remote_ip6,
                                       dst=p.remote_tun_if_host6, count=count)
            recv_pkts = self.send_and_expect(self.pg1, send_pkts, self.tun_if)
            for recv_pkt in recv_pkts:
                try:
                    decrypt_pkt = p.vpp_tun_sa.decrypt(recv_pkt[IP])
                    if not decrypt_pkt.haslayer(IPv6):
                        decrypt_pkt = IPv6(decrypt_pkt[Raw].load)
                    self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip6)
                    self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host6)
                    self.assert_packet_checksums_valid(decrypt_pkt)
                except:
                    self.logger.error(ppp("Unexpected packet:", recv_pkt))
                    try:
                        self.logger.debug(
                            ppp("Decrypted packet:", decrypt_pkt))
                    except:
                        pass
                    raise
        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))

        self.verify_counters4(p, count)

    def verify_keepalive(self, p):
        pkt = (Ether(src=self.tun_if.remote_mac, dst=self.tun_if.local_mac) /
               IP(src=p.remote_tun_if_host, dst=self.tun_if.local_ip4) /
               UDP(sport=333, dport=4500) /
               Raw(0xff))
        self.send_and_assert_no_replies(self.tun_if, pkt*31)
        self.assert_error_counter_equal(
            '/err/%s/NAT Keepalive' % self.tun4_input_node, 31)

        pkt = (Ether(src=self.tun_if.remote_mac, dst=self.tun_if.local_mac) /
               IP(src=p.remote_tun_if_host, dst=self.tun_if.local_ip4) /
               UDP(sport=333, dport=4500) /
               Raw(0xfe))
        self.send_and_assert_no_replies(self.tun_if, pkt*31)
        self.assert_error_counter_equal(
            '/err/%s/Too Short' % self.tun4_input_node, 31)


class IpsecTun4Tests(IpsecTun4):
    """ UT test methods for Tunnel v4 """
    def test_tun_basic44(self):
        """ ipsec 4o4 tunnel basic test """
        self.verify_tun_44(self.params[socket.AF_INET], count=1)

    def test_tun_burst44(self):
        """ ipsec 4o4 tunnel burst test """
        self.verify_tun_44(self.params[socket.AF_INET], count=257)


class IpsecTun6(object):
    """ verify methods for Tunnel v6 """
    def verify_counters6(self, p_in, p_out, count):
        if (hasattr(p_in, "tun_sa_in")):
            pkts = p_in.tun_sa_in.get_stats()['packets']
            self.assertEqual(pkts, count,
                             "incorrect SA in counts: expected %d != %d" %
                             (count, pkts))
        if (hasattr(p_out, "tun_sa_out")):
            pkts = p_out.tun_sa_out.get_stats()['packets']
            self.assertEqual(pkts, count,
                             "incorrect SA out counts: expected %d != %d" %
                             (count, pkts))
        self.assert_packet_counter_equal(self.tun6_encrypt_node_name, count)
        self.assert_packet_counter_equal(self.tun6_decrypt_node_name, count)

    def verify_decrypted6(self, p, rxs):
        for rx in rxs:
            self.assert_equal(rx[IPv6].src, p.remote_tun_if_host)
            self.assert_equal(rx[IPv6].dst, self.pg1.remote_ip6)
            self.assert_packet_checksums_valid(rx)

    def verify_encrypted6(self, p, sa, rxs):
        for rx in rxs:
            self.assert_packet_checksums_valid(rx)
            self.assertEqual(len(rx) - len(Ether()) - len(IPv6()),
                             rx[IPv6].plen)
            try:
                decrypt_pkt = p.vpp_tun_sa.decrypt(rx[IPv6])
                if not decrypt_pkt.haslayer(IPv6):
                    decrypt_pkt = IPv6(decrypt_pkt[Raw].load)
                self.assert_packet_checksums_valid(decrypt_pkt)
                self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip6)
                self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host)
            except:
                self.logger.debug(ppp("Unexpected packet:", rx))
                try:
                    self.logger.debug(ppp("Decrypted packet:", decrypt_pkt))
                except:
                    pass
                raise

    def verify_drop_tun_66(self, p_in, count=1, payload_size=64):
        self.vapi.cli("clear errors")
        self.vapi.cli("clear ipsec sa")

        config_tun_params(p_in, self.encryption_type, self.tun_if)
        send_pkts = self.gen_encrypt_pkts6(p_in.scapy_tun_sa, self.tun_if,
                                           src=p_in.remote_tun_if_host,
                                           dst=self.pg1.remote_ip6,
                                           count=count)
        self.send_and_assert_no_replies(self.tun_if, send_pkts)
        self.logger.info(self.vapi.cli("sh punt stats"))

    def verify_tun_66(self, p_in, p_out=None, count=1, payload_size=64):
        self.vapi.cli("clear errors")
        self.vapi.cli("clear ipsec sa")
        if not p_out:
            p_out = p_in
        try:
            config_tun_params(p_in, self.encryption_type, self.tun_if)
            config_tun_params(p_out, self.encryption_type, self.tun_if)
            send_pkts = self.gen_encrypt_pkts6(p_in.scapy_tun_sa, self.tun_if,
                                               src=p_in.remote_tun_if_host,
                                               dst=self.pg1.remote_ip6,
                                               count=count)
            recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1)
            self.verify_decrypted6(p_in, recv_pkts)

            send_pkts = self.gen_pkts6(self.pg1, src=self.pg1.remote_ip6,
                                       dst=p_out.remote_tun_if_host,
                                       count=count,
                                       payload_size=payload_size)
            recv_pkts = self.send_and_expect(self.pg1, send_pkts,
                                             self.tun_if)
            self.verify_encrypted6(p_out, p_out.vpp_tun_sa, recv_pkts)

        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))
        self.verify_counters6(p_in, p_out, count)

    def verify_tun_46(self, p, count=1):
        """ ipsec 4o6 tunnel basic test """
        self.vapi.cli("clear errors")
        try:
            config_tun_params(p, self.encryption_type, self.tun_if)
            send_pkts = self.gen_encrypt_pkts(p.scapy_tun_sa, self.tun_if,
                                              src=p.remote_tun_if_host4,
                                              dst=self.pg1.remote_ip4,
                                              count=count)
            recv_pkts = self.send_and_expect(self.tun_if, send_pkts, self.pg1)
            for recv_pkt in recv_pkts:
                self.assert_equal(recv_pkt[IP].src, p.remote_tun_if_host4)
                self.assert_equal(recv_pkt[IP].dst, self.pg1.remote_ip4)
                self.assert_packet_checksums_valid(recv_pkt)
            send_pkts = self.gen_pkts(self.pg1, src=self.pg1.remote_ip4,
                                      dst=p.remote_tun_if_host4,
                                      count=count)
            recv_pkts = self.send_and_expect(self.pg1, send_pkts, self.tun_if)
            for recv_pkt in recv_pkts:
                try:
                    decrypt_pkt = p.vpp_tun_sa.decrypt(recv_pkt[IPv6])
                    if not decrypt_pkt.haslayer(IP):
                        decrypt_pkt = IP(decrypt_pkt[Raw].load)
                    self.assert_equal(decrypt_pkt.src, self.pg1.remote_ip4)
                    self.assert_equal(decrypt_pkt.dst, p.remote_tun_if_host4)
                    self.assert_packet_checksums_valid(decrypt_pkt)
                except:
                    self.logger.debug(ppp("Unexpected packet:", recv_pkt))
                    try:
                        self.logger.debug(ppp("Decrypted packet:",
                                              decrypt_pkt))
                    except:
                        pass
                    raise
        finally:
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show ipsec all"))
        self.verify_counters6(p, p, count)


class IpsecTun6Tests(IpsecTun6):
    """ UT test methods for Tunnel v6 """

    def test_tun_basic66(self):
        """ ipsec 6o6 tunnel basic test """
        self.verify_tun_66(self.params[socket.AF_INET6], count=1)

    def test_tun_burst66(self):
        """ ipsec 6o6 tunnel burst test """
        self.verify_tun_66(self.params[socket.AF_INET6], count=257)


class IpsecTun46Tests(IpsecTun4Tests, IpsecTun6Tests):
    """ UT test methods for Tunnel v6 & v4 """
    pass


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