summaryrefslogtreecommitdiffstats
path: root/test/test_ip4.py
blob: 1a611251eb5774a252eb6e64de72e55040e3b0eb (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
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
#!/usr/bin/env python
import random
import socket
import unittest

from framework import VppTestCase, VppTestRunner
from vpp_sub_interface import VppSubInterface, VppDot1QSubint, VppDot1ADSubint
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpMRoute, \
    VppMRoutePath, MRouteItfFlags, MRouteEntryFlags, VppMplsIpBind, \
    VppMplsTable, VppIpTable

from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q, ARP
from scapy.layers.inet import IP, UDP, TCP, ICMP, icmptypes, icmpcodes
from util import ppp
from scapy.contrib.mpls import MPLS


class TestIPv4(VppTestCase):
    """ IPv4 Test Case """

    def setUp(self):
        """
        Perform test setup before test case.

        **Config:**
            - create 3 pg interfaces
                - untagged pg0 interface
                - Dot1Q subinterface on pg1
                - Dot1AD subinterface on pg2
            - setup interfaces:
                - put it into UP state
                - set IPv4 addresses
                - resolve neighbor address using ARP
            - configure 200 fib entries

        :ivar list interfaces: pg interfaces and subinterfaces.
        :ivar dict flows: IPv4 packet flows in test.
        :ivar list pg_if_packet_sizes: packet sizes in test.
        """
        super(TestIPv4, self).setUp()

        # create 3 pg interfaces
        self.create_pg_interfaces(range(3))

        # create 2 subinterfaces for pg1 and pg2
        self.sub_interfaces = [
            VppDot1QSubint(self, self.pg1, 100),
            VppDot1ADSubint(self, self.pg2, 200, 300, 400)]

        # packet flows mapping pg0 -> pg1.sub, pg2.sub, etc.
        self.flows = dict()
        self.flows[self.pg0] = [self.pg1.sub_if, self.pg2.sub_if]
        self.flows[self.pg1.sub_if] = [self.pg0, self.pg2.sub_if]
        self.flows[self.pg2.sub_if] = [self.pg0, self.pg1.sub_if]

        # packet sizes
        self.pg_if_packet_sizes = [64, 512, 1518, 9018]
        self.sub_if_packet_sizes = [64, 512, 1518 + 4, 9018 + 4]

        self.interfaces = list(self.pg_interfaces)
        self.interfaces.extend(self.sub_interfaces)

        # setup all interfaces
        for i in self.interfaces:
            i.admin_up()
            i.config_ip4()
            i.resolve_arp()

        # config 2M FIB entries
        self.config_fib_entries(200)

    def tearDown(self):
        """Run standard test teardown and log ``show ip arp``."""
        super(TestIPv4, self).tearDown()
        if not self.vpp_dead:
            self.logger.info(self.vapi.cli("show ip arp"))
            # info(self.vapi.cli("show ip fib"))  # many entries

    def config_fib_entries(self, count):
        """For each interface add to the FIB table *count* routes to
        "10.0.0.1/32" destination with interface's local address as next-hop
        address.

        :param int count: Number of FIB entries.

        - *TODO:* check if the next-hop address shouldn't be remote address
          instead of local address.
        """
        n_int = len(self.interfaces)
        percent = 0
        counter = 0.0
        dest_addr = socket.inet_pton(socket.AF_INET, "10.0.0.1")
        dest_addr_len = 32
        for i in self.interfaces:
            next_hop_address = i.local_ip4n
            for j in range(count / n_int):
                self.vapi.ip_add_del_route(
                    dest_addr, dest_addr_len, next_hop_address)
                counter += 1
                if counter / count * 100 > percent:
                    self.logger.info("Configure %d FIB entries .. %d%% done" %
                                     (count, percent))
                    percent += 1

    def create_stream(self, src_if, packet_sizes):
        """Create input packet stream for defined interface.

        :param VppInterface src_if: Interface to create packet stream for.
        :param list packet_sizes: Required packet sizes.
        """
        pkts = []
        for i in range(0, 257):
            dst_if = self.flows[src_if][i % 2]
            info = self.create_packet_info(src_if, dst_if)
            payload = self.info_to_payload(info)
            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                 IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            if isinstance(src_if, VppSubInterface):
                p = src_if.add_dot1_layer(p)
            size = packet_sizes[(i // 2) % len(packet_sizes)]
            self.extend_packet(p, size)
            pkts.append(p)
        return pkts

    def verify_capture(self, dst_if, capture):
        """Verify captured input packet stream for defined interface.

        :param VppInterface dst_if: Interface to verify captured packet stream
                                    for.
        :param list capture: Captured packet stream.
        """
        self.logger.info("Verifying capture on interface %s" % dst_if.name)
        last_info = dict()
        for i in self.interfaces:
            last_info[i.sw_if_index] = None
        is_sub_if = False
        dst_sw_if_index = dst_if.sw_if_index
        if hasattr(dst_if, 'parent'):
            is_sub_if = True
        for packet in capture:
            if is_sub_if:
                # Check VLAN tags and Ethernet header
                packet = dst_if.remove_dot1_layer(packet)
            self.assertTrue(Dot1Q not in packet)
            try:
                ip = packet[IP]
                udp = packet[UDP]
                payload_info = self.payload_to_info(str(packet[Raw]))
                packet_index = payload_info.index
                self.assertEqual(payload_info.dst, dst_sw_if_index)
                self.logger.debug(
                    "Got packet on port %s: src=%u (id=%u)" %
                    (dst_if.name, payload_info.src, packet_index))
                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
                self.assertTrue(next_info is not None)
                self.assertEqual(packet_index, next_info.index)
                saved_packet = next_info.data
                # Check standard fields
                self.assertEqual(ip.src, saved_packet[IP].src)
                self.assertEqual(ip.dst, saved_packet[IP].dst)
                self.assertEqual(udp.sport, saved_packet[UDP].sport)
                self.assertEqual(udp.dport, saved_packet[UDP].dport)
            except:
                self.logger.error(ppp("Unexpected or invalid packet:", packet))
                raise
        for i in self.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))

    def test_fib(self):
        """ IPv4 FIB test

        Test scenario:

            - Create IPv4 stream for pg0 interface
            - Create IPv4 tagged streams for pg1's and pg2's subinterface.
            - Send and verify received packets on each interface.
        """

        pkts = self.create_stream(self.pg0, self.pg_if_packet_sizes)
        self.pg0.add_stream(pkts)

        for i in self.sub_interfaces:
            pkts = self.create_stream(i, self.sub_if_packet_sizes)
            i.parent.add_stream(pkts)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        pkts = self.pg0.get_capture()
        self.verify_capture(self.pg0, pkts)

        for i in self.sub_interfaces:
            pkts = i.parent.get_capture()
            self.verify_capture(i, pkts)


class TestIPv4FibCrud(VppTestCase):
    """ FIB - add/update/delete - ip4 routes

    Test scenario:
        - add 1k,
        - del 100,
        - add new 1k,
        - del 1.5k

    ..note:: Python API is too slow to add many routes, needs replacement.
    """

    def config_fib_many_to_one(self, start_dest_addr, next_hop_addr, count):
        """

        :param start_dest_addr:
        :param next_hop_addr:
        :param count:
        :return list: added ips with 32 prefix
        """
        added_ips = []
        dest_addr = int(socket.inet_pton(socket.AF_INET,
                                         start_dest_addr).encode('hex'),
                        16)
        dest_addr_len = 32
        n_next_hop_addr = socket.inet_pton(socket.AF_INET, next_hop_addr)
        for _ in range(count):
            n_dest_addr = '{:08x}'.format(dest_addr).decode('hex')
            self.vapi.ip_add_del_route(n_dest_addr, dest_addr_len,
                                       n_next_hop_addr)
            added_ips.append(socket.inet_ntoa(n_dest_addr))
            dest_addr += 1
        return added_ips

    def unconfig_fib_many_to_one(self, start_dest_addr, next_hop_addr, count):

        removed_ips = []
        dest_addr = int(socket.inet_pton(socket.AF_INET,
                                         start_dest_addr).encode('hex'),
                        16)
        dest_addr_len = 32
        n_next_hop_addr = socket.inet_pton(socket.AF_INET, next_hop_addr)
        for _ in range(count):
            n_dest_addr = '{:08x}'.format(dest_addr).decode('hex')
            self.vapi.ip_add_del_route(n_dest_addr, dest_addr_len,
                                       n_next_hop_addr, is_add=0)
            removed_ips.append(socket.inet_ntoa(n_dest_addr))
            dest_addr += 1
        return removed_ips

    def create_stream(self, src_if, dst_if, dst_ips, count):
        pkts = []

        for _ in range(count):
            dst_addr = random.choice(dst_ips)
            info = self.create_packet_info(src_if, dst_if)
            payload = self.info_to_payload(info)
            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                 IP(src=src_if.remote_ip4, dst=dst_addr) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            self.extend_packet(p, random.choice(self.pg_if_packet_sizes))
            pkts.append(p)

        return pkts

    def _find_ip_match(self, find_in, pkt):
        for p in find_in:
            if self.payload_to_info(str(p[Raw])) == \
                    self.payload_to_info(str(pkt[Raw])):
                if p[IP].src != pkt[IP].src:
                    break
                if p[IP].dst != pkt[IP].dst:
                    break
                if p[UDP].sport != pkt[UDP].sport:
                    break
                if p[UDP].dport != pkt[UDP].dport:
                    break
                return p
        return None

    @staticmethod
    def _match_route_detail(route_detail, ip, address_length=32, table_id=0):
        if route_detail.address == socket.inet_pton(socket.AF_INET, ip):
            if route_detail.table_id != table_id:
                return False
            elif route_detail.address_length != address_length:
                return False
            else:
                return True
        else:
            return False

    def verify_capture(self, dst_interface, received_pkts, expected_pkts):
        self.assertEqual(len(received_pkts), len(expected_pkts))
        to_verify = list(expected_pkts)
        for p in received_pkts:
            self.assertEqual(p.src, dst_interface.local_mac)
            self.assertEqual(p.dst, dst_interface.remote_mac)
            x = self._find_ip_match(to_verify, p)
            to_verify.remove(x)
        self.assertListEqual(to_verify, [])

    def verify_route_dump(self, fib_dump, ips):

        def _ip_in_route_dump(ip, fib_dump):
            return next((route for route in fib_dump
                         if self._match_route_detail(route, ip)),
                        False)

        for ip in ips:
            self.assertTrue(_ip_in_route_dump(ip, fib_dump),
                            'IP {} is not in fib dump.'.format(ip))

    def verify_not_in_route_dump(self, fib_dump, ips):

        def _ip_in_route_dump(ip, fib_dump):
            return next((route for route in fib_dump
                         if self._match_route_detail(route, ip)),
                        False)

        for ip in ips:
            self.assertFalse(_ip_in_route_dump(ip, fib_dump),
                             'IP {} is in fib dump.'.format(ip))

    @classmethod
    def setUpClass(cls):
        """
        #. Create and initialize 3 pg interfaces.
        #. initialize class attributes configured_routes and deleted_routes
           to store information between tests.
        """
        super(TestIPv4FibCrud, cls).setUpClass()

        try:
            # create 3 pg interfaces
            cls.create_pg_interfaces(range(3))

            cls.interfaces = list(cls.pg_interfaces)

            # setup all interfaces
            for i in cls.interfaces:
                i.admin_up()
                i.config_ip4()
                i.resolve_arp()

            cls.configured_routes = []
            cls.deleted_routes = []
            cls.pg_if_packet_sizes = [64, 512, 1518, 9018]

        except Exception:
            super(TestIPv4FibCrud, cls).tearDownClass()
            raise

    def setUp(self):
        super(TestIPv4FibCrud, self).setUp()
        self.reset_packet_infos()

    def test_1_add_routes(self):
        """ Add 1k routes

        - add 100 routes check with traffic script.
        """
        # config 1M FIB entries
        self.configured_routes.extend(self.config_fib_many_to_one(
            "10.0.0.0", self.pg0.remote_ip4, 100))

        fib_dump = self.vapi.ip_fib_dump()
        self.verify_route_dump(fib_dump, self.configured_routes)

        self.stream_1 = self.create_stream(
            self.pg1, self.pg0, self.configured_routes, 100)
        self.stream_2 = self.create_stream(
            self.pg2, self.pg0, self.configured_routes, 100)
        self.pg1.add_stream(self.stream_1)
        self.pg2.add_stream(self.stream_2)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
        self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)

    def test_2_del_routes(self):
        """ Delete 100 routes

        - delete 10 routes check with traffic script.
        """
        self.deleted_routes.extend(self.unconfig_fib_many_to_one(
            "10.0.0.10", self.pg0.remote_ip4, 10))
        for x in self.deleted_routes:
            self.configured_routes.remove(x)

        fib_dump = self.vapi.ip_fib_dump()
        self.verify_route_dump(fib_dump, self.configured_routes)

        self.stream_1 = self.create_stream(
            self.pg1, self.pg0, self.configured_routes, 100)
        self.stream_2 = self.create_stream(
            self.pg2, self.pg0, self.configured_routes, 100)
        self.stream_3 = self.create_stream(
            self.pg1, self.pg0, self.deleted_routes, 100)
        self.stream_4 = self.create_stream(
            self.pg2, self.pg0, self.deleted_routes, 100)
        self.pg1.add_stream(self.stream_1 + self.stream_3)
        self.pg2.add_stream(self.stream_2 + self.stream_4)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
        self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)

    def test_3_add_new_routes(self):
        """ Add 1k routes

        - re-add 5 routes check with traffic script.
        - add 100 routes check with traffic script.
        """
        tmp = self.config_fib_many_to_one(
            "10.0.0.10", self.pg0.remote_ip4, 5)
        self.configured_routes.extend(tmp)
        for x in tmp:
            self.deleted_routes.remove(x)

        self.configured_routes.extend(self.config_fib_many_to_one(
            "10.0.1.0", self.pg0.remote_ip4, 100))

        fib_dump = self.vapi.ip_fib_dump()
        self.verify_route_dump(fib_dump, self.configured_routes)

        self.stream_1 = self.create_stream(
            self.pg1, self.pg0, self.configured_routes, 300)
        self.stream_2 = self.create_stream(
            self.pg2, self.pg0, self.configured_routes, 300)
        self.stream_3 = self.create_stream(
            self.pg1, self.pg0, self.deleted_routes, 100)
        self.stream_4 = self.create_stream(
            self.pg2, self.pg0, self.deleted_routes, 100)

        self.pg1.add_stream(self.stream_1 + self.stream_3)
        self.pg2.add_stream(self.stream_2 + self.stream_4)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
        self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)

    def test_4_del_routes(self):
        """ Delete 1.5k routes

        - delete 5 routes check with traffic script.
        - add 100 routes check with traffic script.
        """
        self.deleted_routes.extend(self.unconfig_fib_many_to_one(
            "10.0.0.0", self.pg0.remote_ip4, 15))
        self.deleted_routes.extend(self.unconfig_fib_many_to_one(
            "10.0.0.20", self.pg0.remote_ip4, 85))
        self.deleted_routes.extend(self.unconfig_fib_many_to_one(
            "10.0.1.0", self.pg0.remote_ip4, 100))
        fib_dump = self.vapi.ip_fib_dump()
        self.verify_not_in_route_dump(fib_dump, self.deleted_routes)


class TestIPNull(VppTestCase):
    """ IPv4 routes via NULL """

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

        # create 2 pg interfaces
        self.create_pg_interfaces(range(1))

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

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

    def test_ip_null(self):
        """ IP NULL route """

        #
        # A route via IP NULL that will reply with ICMP unreachables
        #
        ip_unreach = VppIpRoute(self, "10.0.0.1", 32, [], is_unreach=1)
        ip_unreach.add_vpp_config()

        p_unreach = (Ether(src=self.pg0.remote_mac,
                           dst=self.pg0.local_mac) /
                     IP(src=self.pg0.remote_ip4, dst="10.0.0.1") /
                     UDP(sport=1234, dport=1234) /
                     Raw('\xa5' * 100))

        self.pg0.add_stream(p_unreach)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)
        rx = rx[0]
        icmp = rx[ICMP]

        self.assertEqual(icmptypes[icmp.type], "dest-unreach")
        self.assertEqual(icmpcodes[icmp.type][icmp.code], "host-unreachable")
        self.assertEqual(icmp.src, self.pg0.remote_ip4)
        self.assertEqual(icmp.dst, "10.0.0.1")

        #
        # ICMP replies are rate limited. so sit and spin.
        #
        self.sleep(1)

        #
        # A route via IP NULL that will reply with ICMP prohibited
        #
        ip_prohibit = VppIpRoute(self, "10.0.0.2", 32, [], is_prohibit=1)
        ip_prohibit.add_vpp_config()

        p_prohibit = (Ether(src=self.pg0.remote_mac,
                            dst=self.pg0.local_mac) /
                      IP(src=self.pg0.remote_ip4, dst="10.0.0.2") /
                      UDP(sport=1234, dport=1234) /
                      Raw('\xa5' * 100))

        self.pg0.add_stream(p_prohibit)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)

        rx = rx[0]
        icmp = rx[ICMP]

        self.assertEqual(icmptypes[icmp.type], "dest-unreach")
        self.assertEqual(icmpcodes[icmp.type][icmp.code], "host-prohibited")
        self.assertEqual(icmp.src, self.pg0.remote_ip4)
        self.assertEqual(icmp.dst, "10.0.0.2")


class TestIPDisabled(VppTestCase):
    """ IPv4 disabled """

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

        # create 2 pg interfaces
        self.create_pg_interfaces(range(2))

        # PG0 is IP enalbed
        self.pg0.admin_up()
        self.pg0.config_ip4()
        self.pg0.resolve_arp()

        # PG 1 is not IP enabled
        self.pg1.admin_up()

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

    def test_ip_disabled(self):
        """ IP Disabled """

        #
        # An (S,G).
        # one accepting interface, pg0, 2 forwarding interfaces
        #
        route_232_1_1_1 = VppIpMRoute(
            self,
            "0.0.0.0",
            "232.1.1.1", 32,
            MRouteEntryFlags.MFIB_ENTRY_FLAG_NONE,
            [VppMRoutePath(self.pg1.sw_if_index,
                           MRouteItfFlags.MFIB_ITF_FLAG_ACCEPT),
             VppMRoutePath(self.pg0.sw_if_index,
                           MRouteItfFlags.MFIB_ITF_FLAG_FORWARD)])
        route_232_1_1_1.add_vpp_config()

        pu = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(src="10.10.10.10", dst=self.pg0.remote_ip4) /
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))
        pm = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(src="10.10.10.10", dst="232.1.1.1") /
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))

        #
        # PG1 does not forward IP traffic
        #
        self.send_and_assert_no_replies(self.pg1, pu, "IP disabled")
        self.send_and_assert_no_replies(self.pg1, pm, "IP disabled")

        #
        # IP enable PG1
        #
        self.pg1.config_ip4()

        #
        # Now we get packets through
        #
        self.pg1.add_stream(pu)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg0.get_capture(1)

        self.pg1.add_stream(pm)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg0.get_capture(1)

        #
        # Disable PG1
        #
        self.pg1.unconfig_ip4()

        #
        # PG1 does not forward IP traffic
        #
        self.send_and_assert_no_replies(self.pg1, pu, "IP disabled")
        self.send_and_assert_no_replies(self.pg1, pm, "IP disabled")


class TestIPSubNets(VppTestCase):
    """ IPv4 Subnets """

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

        # create a 2 pg interfaces
        self.create_pg_interfaces(range(2))

        # pg0 we will use to experiemnt
        self.pg0.admin_up()

        # pg1 is setup normally
        self.pg1.admin_up()
        self.pg1.config_ip4()
        self.pg1.resolve_arp()

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

    def test_ip_sub_nets(self):
        """ IP Sub Nets """

        #
        # Configure a covering route to forward so we know
        # when we are dropping
        #
        cover_route = VppIpRoute(self, "10.0.0.0", 8,
                                 [VppRoutePath(self.pg1.remote_ip4,
                                               self.pg1.sw_if_index)])
        cover_route.add_vpp_config()

        p = (Ether(src=self.pg1.remote_mac,
                   dst=self.pg1.local_mac) /
             IP(dst="10.10.10.10", src=self.pg0.local_ip4) /
             UDP(sport=1234, dport=1234) /
             Raw('\xa5' * 100))

        self.pg1.add_stream(p)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)

        #
        # Configure some non-/24 subnets on an IP interface
        #
        ip_addr_n = socket.inet_pton(socket.AF_INET, "10.10.10.10")

        self.vapi.sw_interface_add_del_address(self.pg0.sw_if_index,
                                               ip_addr_n,
                                               16)

        pn = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(dst="10.10.0.0", src=self.pg0.local_ip4) /
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))
        pb = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(dst="10.10.255.255", src=self.pg0.local_ip4) /
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))

        self.send_and_assert_no_replies(self.pg1, pn, "IP Network address")
        self.send_and_assert_no_replies(self.pg1, pb, "IP Broadcast address")

        # remove the sub-net and we are forwarding via the cover again
        self.vapi.sw_interface_add_del_address(self.pg0.sw_if_index,
                                               ip_addr_n,
                                               16,
                                               is_add=0)
        self.pg1.add_stream(pn)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)
        self.pg1.add_stream(pb)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)

        #
        # A /31 is a special case where the 'other-side' is an attached host
        # packets to that peer generate ARP requests
        #
        ip_addr_n = socket.inet_pton(socket.AF_INET, "10.10.10.10")

        self.vapi.sw_interface_add_del_address(self.pg0.sw_if_index,
                                               ip_addr_n,
                                               31)

        pn = (Ether(src=self.pg1.remote_mac,
                    dst=self.pg1.local_mac) /
              IP(dst="10.10.10.11", src=self.pg0.local_ip4) /
              UDP(sport=1234, dport=1234) /
              Raw('\xa5' * 100))

        self.pg1.add_stream(pn)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg0.get_capture(1)
        rx[ARP]

        # remove the sub-net and we are forwarding via the cover again
        self.vapi.sw_interface_add_del_address(self.pg0.sw_if_index,
                                               ip_addr_n,
                                               31,
                                               is_add=0)
        self.pg1.add_stream(pn)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg1.get_capture(1)


class TestIPLoadBalance(VppTestCase):
    """ IPv4 Load-Balancing """

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

        self.create_pg_interfaces(range(5))
        mpls_tbl = VppMplsTable(self, 0)
        mpls_tbl.add_vpp_config()

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

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

    def send_and_expect_load_balancing(self, input, pkts, outputs):
        input.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        for oo in outputs:
            rx = oo._get_capture(1)
            self.assertNotEqual(0, len(rx))

    def send_and_expect_one_itf(self, input, pkts, itf):
        input.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = itf.get_capture(len(pkts))

    def test_ip_load_balance(self):
        """ IP Load-Balancing """

        #
        # An array of packets that differ only in the destination port
        #
        port_ip_pkts = []
        port_mpls_pkts = []

        #
        # An array of packets that differ only in the source address
        #
        src_ip_pkts = []
        src_mpls_pkts = []

        for ii in range(65):
            port_ip_hdr = (IP(dst="10.0.0.1", src="20.0.0.1") /
                           UDP(sport=1234, dport=1234 + ii) /
                           Raw('\xa5' * 100))
            port_ip_pkts.append((Ether(src=self.pg0.remote_mac,
                                       dst=self.pg0.local_mac) /
                                 port_ip_hdr))
            port_mpls_pkts.append((Ether(src=self.pg0.remote_mac,
                                         dst=self.pg0.local_mac) /
                                   MPLS(label=66, ttl=2) /
                                   port_ip_hdr))

            src_ip_hdr = (IP(dst="10.0.0.1", src="20.0.0.%d" % ii) /
                          UDP(sport=1234, dport=1234) /
                          Raw('\xa5' * 100))
            src_ip_pkts.append((Ether(src=self.pg0.remote_mac,
                                      dst=self.pg0.local_mac) /
                                src_ip_hdr))
            src_mpls_pkts.append((Ether(src=self.pg0.remote_mac,
                                        dst=self.pg0.local_mac) /
                                  MPLS(label=66, ttl=2) /
                                  src_ip_hdr))

        route_10_0_0_1 = VppIpRoute(self, "10.0.0.1", 32,
                                    [VppRoutePath(self.pg1.remote_ip4,
                                                  self.pg1.sw_if_index),
                                     VppRoutePath(self.pg2.remote_ip4,
                                                  self.pg2.sw_if_index)])
        route_10_0_0_1.add_vpp_config()

        binding = VppMplsIpBind(self, 66, "10.0.0.1", 32)
        binding.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across the 2 paths
        #  - since the default hash config is to use IP src,dst and port
        #    src,dst
        # We are not going to ensure equal amounts of packets across each link,
        # since the hash algorithm is statistical and therefore this can never
        # be guaranteed. But wuth 64 different packets we do expect some
        # balancing. So instead just ensure there is traffic on each link.
        #
        self.send_and_expect_load_balancing(self.pg0, port_ip_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, src_ip_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, port_mpls_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, src_mpls_pkts,
                                            [self.pg1, self.pg2])

        #
        # change the flow hash config so it's only IP src,dst
        #  - now only the stream with differing source address will
        #    load-balance
        #
        self.vapi.set_ip_flow_hash(0, src=1, dst=1, sport=0, dport=0)

        self.send_and_expect_load_balancing(self.pg0, src_ip_pkts,
                                            [self.pg1, self.pg2])
        self.send_and_expect_load_balancing(self.pg0, src_mpls_pkts,
                                            [self.pg1, self.pg2])

        self.send_and_expect_one_itf(self.pg0, port_ip_pkts, self.pg2)

        #
        # change the flow hash config back to defaults
        #
        self.vapi.set_ip_flow_hash(0, src=1, dst=1, sport=1, dport=1)

        #
        # Recursive prefixes
        #  - testing that 2 stages of load-balancing occurs and there is no
        #    polarisation (i.e. only 2 of 4 paths are used)
        #
        port_pkts = []
        src_pkts = []

        for ii in range(257):
            port_pkts.append((Ether(src=self.pg0.remote_mac,
                                    dst=self.pg0.local_mac) /
                              IP(dst="1.1.1.1", src="20.0.0.1") /
                              UDP(sport=1234, dport=1234 + ii) /
                              Raw('\xa5' * 100)))
            src_pkts.append((Ether(src=self.pg0.remote_mac,
                                   dst=self.pg0.local_mac) /
                             IP(dst="1.1.1.1", src="20.0.0.%d" % ii) /
                             UDP(sport=1234, dport=1234) /
                             Raw('\xa5' * 100)))

        route_10_0_0_2 = VppIpRoute(self, "10.0.0.2", 32,
                                    [VppRoutePath(self.pg3.remote_ip4,
                                                  self.pg3.sw_if_index),
                                     VppRoutePath(self.pg4.remote_ip4,
                                                  self.pg4.sw_if_index)])
        route_10_0_0_2.add_vpp_config()

        route_1_1_1_1 = VppIpRoute(self, "1.1.1.1", 32,
                                   [VppRoutePath("10.0.0.2", 0xffffffff),
                                    VppRoutePath("10.0.0.1", 0xffffffff)])
        route_1_1_1_1.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across all 4 paths
        #
        self.vapi.cli("clear trace")
        self.send_and_expect_load_balancing(self.pg0, port_pkts,
                                            [self.pg1, self.pg2,
                                             self.pg3, self.pg4])
        self.send_and_expect_load_balancing(self.pg0, src_pkts,
                                            [self.pg1, self.pg2,
                                             self.pg3, self.pg4])

        #
        # Recursive prefixes
        #  - testing that 2 stages of load-balancing, no choices
        #
        port_pkts = []

        for ii in range(257):
            port_pkts.append((Ether(src=self.pg0.remote_mac,
                                    dst=self.pg0.local_mac) /
                              IP(dst="1.1.1.2", src="20.0.0.2") /
                              UDP(sport=1234, dport=1234 + ii) /
                              Raw('\xa5' * 100)))

        route_10_0_0_3 = VppIpRoute(self, "10.0.0.3", 32,
                                    [VppRoutePath(self.pg3.remote_ip4,
                                                  self.pg3.sw_if_index)])
        route_10_0_0_3.add_vpp_config()

        route_1_1_1_2 = VppIpRoute(self, "1.1.1.2", 32,
                                   [VppRoutePath("10.0.0.3", 0xffffffff)])
        route_1_1_1_2.add_vpp_config()

        #
        # inject the packet on pg0 - expect load-balancing across all 4 paths
        #
        self.vapi.cli("clear trace")
        self.send_and_expect_one_itf(self.pg0, port_pkts, self.pg3)


class TestIPVlan0(VppTestCase):
    """ IPv4 VLAN-0 """

    def setUp(self):
        super(TestIPVlan0, self).setUp()

        self.create_pg_interfaces(range(2))
        mpls_tbl = VppMplsTable(self, 0)
        mpls_tbl.add_vpp_config()

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

    def tearDown(self):
        for i in self.pg_interfaces:
            i.disable_mpls()
            i.unconfig_ip4()
            i.admin_down()
        super(TestIPVlan0, self).tearDown()

    def test_ip_vlan_0(self):
        """ IP VLAN-0 """

        pkts = (Ether(src=self.pg0.remote_mac,
                      dst=self.pg0.local_mac) /
                Dot1Q(vlan=0) /
                IP(dst=self.pg1.remote_ip4,
                   src=self.pg0.remote_ip4) /
                UDP(sport=1234, dport=1234) /
                Raw('\xa5' * 100)) * 65

        #
        # Expect that packets sent on VLAN-0 are forwarded on the
        # main interface.
        #
        self.send_and_expect(self.pg0, pkts, self.pg1)


class TestIPPunt(VppTestCase):
    """ IPv4 Punt Police/Redirect """

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

        self.create_pg_interfaces(range(2))

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

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

    def test_ip_punt(self):
        """ IP punt police and redirect """

        p = (Ether(src=self.pg0.remote_mac,
                   dst=self.pg0.local_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             TCP(sport=1234, dport=1234) /
             Raw('\xa5' * 100))

        pkts = p * 1025

        #
        # Configure a punt redirect via pg1.
        #
        nh_addr = socket.inet_pton(socket.AF_INET,
                                   self.pg1.remote_ip4)
        self.vapi.ip_punt_redirect(self.pg0.sw_if_index,
                                   self.pg1.sw_if_index,
                                   nh_addr)

        self.send_and_expect(self.pg0, pkts, self.pg1)

        #
        # add a policer
        #
        policer = self.vapi.policer_add_del("ip4-punt", 400, 0, 10, 0,
                                            rate_type=1)
        self.vapi.ip_punt_police(policer.policer_index)

        self.vapi.cli("clear trace")
        self.pg0.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        #
        # the number of packet recieved should be greater than 0,
        # but not equal to the number sent, since some were policed
        #
        rx = self.pg1._get_capture(1)
        self.assertTrue(len(rx) > 0)
        self.assertTrue(len(rx) < len(pkts))

        #
        # remove the poilcer. back to full rx
        #
        self.vapi.ip_punt_police(policer.policer_index, is_add=0)
        self.vapi.policer_add_del("ip4-punt", 400, 0, 10, 0,
                                  rate_type=1, is_add=0)
        self.send_and_expect(self.pg0, pkts, self.pg1)

        #
        # remove the redirect. expect full drop.
        #
        self.vapi.ip_punt_redirect(self.pg0.sw_if_index,
                                   self.pg1.sw_if_index,
                                   nh_addr,
                                   is_add=0)
        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "IP no punt config")

        #
        # Add a redirect that is not input port selective
        #
        self.vapi.ip_punt_redirect(0xffffffff,
                                   self.pg1.sw_if_index,
                                   nh_addr)
        self.send_and_expect(self.pg0, pkts, self.pg1)

        self.vapi.ip_punt_redirect(0xffffffff,
                                   self.pg1.sw_if_index,
                                   nh_addr,
                                   is_add=0)


class TestIPDeag(VppTestCase):
    """ IPv4 Deaggregate Routes """

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

        self.create_pg_interfaces(range(3))

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

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

    def test_ip_deag(self):
        """ IP Deag Routes """

        #
        # Create a table to be used for:
        #  1 - another destination address lookup
        #  2 - a source address lookup
        #
        table_dst = VppIpTable(self, 1)
        table_src = VppIpTable(self, 2)
        table_dst.add_vpp_config()
        table_src.add_vpp_config()

        #
        # Add a route in the default table to point to a deag/
        # second lookup in each of these tables
        #
        route_to_dst = VppIpRoute(self, "1.1.1.1", 32,
                                  [VppRoutePath("0.0.0.0",
                                                0xffffffff,
                                                nh_table_id=1)])
        route_to_src = VppIpRoute(self, "1.1.1.2", 32,
                                  [VppRoutePath("0.0.0.0",
                                                0xffffffff,
                                                nh_table_id=2,
                                                is_source_lookup=1)])
        route_to_dst.add_vpp_config()
        route_to_src.add_vpp_config()

        #
        # packets to these destination are dropped, since they'll
        # hit the respective default routes in the second table
        #
        p_dst = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="5.5.5.5", dst="1.1.1.1") /
                 TCP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        p_src = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src="2.2.2.2", dst="1.1.1.2") /
                 TCP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))
        pkts_dst = p_dst * 257
        pkts_src = p_src * 257

        self.send_and_assert_no_replies(self.pg0, pkts_dst,
                                        "IP in dst table")
        self.send_and_assert_no_replies(self.pg0, pkts_src,
                                        "IP in src table")

        #
        # add a route in the dst table to forward via pg1
        #
        route_in_dst = VppIpRoute(self, "1.1.1.1", 32,
                                  [VppRoutePath(self.pg1.remote_ip4,
                                                self.pg1.sw_if_index)],
                                  table_id=1)
        route_in_dst.add_vpp_config()
        self.send_and_expect(self.pg0, pkts_dst, self.pg1)

        #
        # add a route in the src table to forward via pg2
        #
        route_in_src = VppIpRoute(self, "2.2.2.2", 32,
                                  [VppRoutePath(self.pg2.remote_ip4,
                                                self.pg2.sw_if_index)],
                                  table_id=2)
        route_in_src.add_vpp_config()
        self.send_and_expect(self.pg0, pkts_src, self.pg2)


class TestIPInput(VppTestCase):
    """ IPv4 Input Exceptions """

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

        self.create_pg_interfaces(range(2))

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

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

    def test_ip_input(self):
        """ IP Input Exceptions """

        # i can't find a way in scapy to construct an IP packet
        # with a length less than the IP header length

        #
        # Packet too short - this is forwarded
        #
        p_short = (Ether(src=self.pg0.remote_mac,
                         dst=self.pg0.local_mac) /
                   IP(src=self.pg0.remote_ip4,
                      dst=self.pg1.remote_ip4,
                      len=40) /
                   UDP(sport=1234, dport=1234) /
                   Raw('\xa5' * 100))

        rx = self.send_and_expect(self.pg0, p_short * 65, self.pg1)

        #
        # Packet too long - this is dropped
        #
        p_long = (Ether(src=self.pg0.remote_mac,
                        dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4,
                     dst=self.pg1.remote_ip4,
                     len=400) /
                  UDP(sport=1234, dport=1234) /
                  Raw('\xa5' * 100))

        rx = self.send_and_assert_no_replies(self.pg0, p_long * 65,
                                             "too long")

        #
        # bad chksum - this is dropped
        #
        p_chksum = (Ether(src=self.pg0.remote_mac,
                          dst=self.pg0.local_mac) /
                    IP(src=self.pg0.remote_ip4,
                       dst=self.pg1.remote_ip4,
                       chksum=400) /
                    UDP(sport=1234, dport=1234) /
                    Raw('\xa5' * 100))

        rx = self.send_and_assert_no_replies(self.pg0, p_chksum * 65,
                                             "bad checksum")

        #
        # bad version - this is dropped
        #
        p_ver = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src=self.pg0.remote_ip4,
                    dst=self.pg1.remote_ip4,
                    version=3) /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))

        rx = self.send_and_assert_no_replies(self.pg0, p_ver * 65,
                                             "funky version")

        #
        # fragment offset 1 - this is dropped
        #
        p_frag = (Ether(src=self.pg0.remote_mac,
                        dst=self.pg0.local_mac) /
                  IP(src=self.pg0.remote_ip4,
                     dst=self.pg1.remote_ip4,
                     frag=1) /
                  UDP(sport=1234, dport=1234) /
                  Raw('\xa5' * 100))

        rx = self.send_and_assert_no_replies(self.pg0, p_frag * 65,
                                             "frag offset")

        #
        # TTL expired packet
        #
        p_ttl = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src=self.pg0.remote_ip4,
                    dst=self.pg1.remote_ip4,
                    ttl=1) /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 100))

        rx = self.send_and_expect(self.pg0, p_ttl * 65, self.pg0)

        rx = rx[0]
        icmp = rx[ICMP]

        self.assertEqual(icmptypes[icmp.type], "time-exceeded")
        self.assertEqual(icmpcodes[icmp.type][icmp.code],
                         "ttl-zero-during-transit")
        self.assertEqual(icmp.src, self.pg0.remote_ip4)
        self.assertEqual(icmp.dst, self.pg1.remote_ip4)

        #
        # MTU exceeded
        #
        p_mtu = (Ether(src=self.pg0.remote_mac,
                       dst=self.pg0.local_mac) /
                 IP(src=self.pg0.remote_ip4,
                    dst=self.pg1.remote_ip4,
                    ttl=10) /
                 UDP(sport=1234, dport=1234) /
                 Raw('\xa5' * 2000))

        self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, 1500)

        rx = self.send_and_expect(self.pg0, p_mtu * 65, self.pg0)
        rx = rx[0]
        icmp = rx[ICMP]

        self.assertEqual(icmptypes[icmp.type], "dest-unreach")
        self.assertEqual(icmpcodes[icmp.type][icmp.code],
                         "fragmentation-needed")
        self.assertEqual(icmp.src, self.pg0.remote_ip4)
        self.assertEqual(icmp.dst, self.pg1.remote_ip4)

        self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, 2500)
        rx = self.send_and_expect(self.pg0, p_mtu * 65, self.pg1)


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