aboutsummaryrefslogtreecommitdiffstats
path: root/test/test_dhcp.py
blob: fbfb8a0c0df8e87b3af5af3e94da9ba88a1b332d (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
#!/usr/bin/env python

import unittest
import socket

from framework import VppTestCase, VppTestRunner

from scapy.layers.l2 import Ether, getmacbyip
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6, in6_getnsmac, in6_mactoifaceid
from scapy.layers.dhcp import DHCP, BOOTP, DHCPTypes
from scapy.layers.dhcp6 import DHCP6, DHCP6_Solicit, DHCP6_RelayForward, \
    DHCP6_RelayReply, DHCP6_Advertise, DHCP6OptRelayMsg, DHCP6OptIfaceId, \
    DHCP6OptStatusCode, DHCP6OptVSS, DHCP6OptClientLinkLayerAddr
from socket import AF_INET, AF_INET6
from scapy.utils import inet_pton, inet_ntop
from scapy.utils6 import in6_ptop

DHCP4_CLIENT_PORT = 68
DHCP4_SERVER_PORT = 67
DHCP6_CLIENT_PORT = 547
DHCP6_SERVER_PORT = 546


def mk_ll_addr(mac):

    euid = in6_mactoifaceid(mac)
    addr = "fe80::" + euid
    return addr


class TestDHCP(VppTestCase):
    """ DHCP Test Case """

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

        # create 3 pg interfaces
        self.create_pg_interfaces(range(4))

        # pg0 and 1 are IP configured in VRF 0 and 1.
        # pg2 and 3 are non IP-configured in VRF 0 and 1
        table_id = 0
        for i in self.pg_interfaces[:2]:
            i.admin_up()
            i.set_table_ip4(table_id)
            i.set_table_ip6(table_id)
            i.config_ip4()
            i.resolve_arp()
            i.config_ip6()
            i.resolve_ndp()
            table_id += 1

        table_id = 0
        for i in self.pg_interfaces[2:]:
            i.admin_up()
            i.set_table_ip4(table_id)
            i.set_table_ip6(table_id)
            table_id += 1

    def send_and_assert_no_replies(self, intf, pkts, remark):
        intf.add_stream(pkts)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        for i in self.pg_interfaces:
            i.assert_nothing_captured(remark=remark)

    def validate_relay_options(self, pkt, intf, ip_addr, fib_id, oui):
        dhcp = pkt[DHCP]
        found = 0
        data = []

        for i in dhcp.options:
            if type(i) is tuple:
                if i[0] == "relay_agent_Information":
                    #
                    # There are two sb-options present - each of length 6.
                    #
                    data = i[1]
                    if oui != 0:
                        self.assertEqual(len(data), 24)
                    else:
                        self.assertEqual(len(data), 12)

                    #
                    # First sub-option is ID 1, len 4, then encoded
                    #  sw_if_index. This test uses low valued indicies
                    # so [2:4] are 0.
                    # The ID space is VPP internal - so no matching value
                    # scapy
                    #
                    self.assertEqual(ord(data[0]), 1)
                    self.assertEqual(ord(data[1]), 4)
                    self.assertEqual(ord(data[2]), 0)
                    self.assertEqual(ord(data[3]), 0)
                    self.assertEqual(ord(data[4]), 0)
                    self.assertEqual(ord(data[5]), intf._sw_if_index)

                    #
                    # next sub-option is the IP address of the client side
                    # interface.
                    # sub-option ID=5, length (of a v4 address)=4
                    #
                    claddr = socket.inet_pton(AF_INET, ip_addr)

                    self.assertEqual(ord(data[6]), 5)
                    self.assertEqual(ord(data[7]), 4)
                    self.assertEqual(data[8], claddr[0])
                    self.assertEqual(data[9], claddr[1])
                    self.assertEqual(data[10], claddr[2])
                    self.assertEqual(data[11], claddr[3])

                    if oui != 0:
                        # sub-option 151 encodes the 3 byte oui
                        # and the 4 byte fib_id
                        self.assertEqual(ord(data[12]), 151)
                        self.assertEqual(ord(data[13]), 8)
                        self.assertEqual(ord(data[14]), 1)
                        self.assertEqual(ord(data[15]), 0)
                        self.assertEqual(ord(data[16]), 0)
                        self.assertEqual(ord(data[17]), oui)
                        self.assertEqual(ord(data[18]), 0)
                        self.assertEqual(ord(data[19]), 0)
                        self.assertEqual(ord(data[20]), 0)
                        self.assertEqual(ord(data[21]), fib_id)

                        # VSS control sub-option
                        self.assertEqual(ord(data[22]), 152)
                        self.assertEqual(ord(data[23]), 0)

                    found = 1
        self.assertTrue(found)

        return data

    def verify_dhcp_offer(self, pkt, intf):
        ether = pkt[Ether]
        self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff")
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IP]
        self.assertEqual(ip.dst, "255.255.255.255")
        self.assertEqual(ip.src, intf.local_ip4)

        udp = pkt[UDP]
        self.assertEqual(udp.dport, DHCP4_CLIENT_PORT)
        self.assertEqual(udp.sport, DHCP4_SERVER_PORT)

        dhcp = pkt[DHCP]
        is_offer = False
        for o in dhcp.options:
            if type(o) is tuple:
                if o[0] == "message-type" \
                   and DHCPTypes[o[1]] == "offer":
                    is_offer = True
        self.assertTrue(is_offer)

        data = self.validate_relay_options(pkt, intf, intf.local_ip4, 0, 0)

    def verify_dhcp_discover(self, pkt, intf, src_intf=None, fib_id=0, oui=0):
        ether = pkt[Ether]
        self.assertEqual(ether.dst, intf.remote_mac)
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IP]
        self.assertEqual(ip.dst, intf.remote_ip4)
        self.assertEqual(ip.src, intf.local_ip4)

        udp = pkt[UDP]
        self.assertEqual(udp.dport, DHCP4_SERVER_PORT)
        self.assertEqual(udp.sport, DHCP4_CLIENT_PORT)

        dhcp = pkt[DHCP]

        is_discover = False
        for o in dhcp.options:
            if type(o) is tuple:
                if o[0] == "message-type" \
                   and DHCPTypes[o[1]] == "discover":
                    is_discover = True
        self.assertTrue(is_discover)

        data = self.validate_relay_options(pkt, src_intf,
                                           src_intf.local_ip4,
                                           fib_id, oui)
        return data

    def verify_dhcp6_solicit(self, pkt, intf,
                             peer_ip, peer_mac,
                             fib_id=0,
                             oui=0):
        ether = pkt[Ether]
        self.assertEqual(ether.dst, intf.remote_mac)
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IPv6]
        self.assertEqual(in6_ptop(ip.dst), in6_ptop(intf.remote_ip6))
        self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6))

        udp = pkt[UDP]
        self.assertEqual(udp.dport, DHCP6_CLIENT_PORT)
        self.assertEqual(udp.sport, DHCP6_SERVER_PORT)

        relay = pkt[DHCP6_RelayForward]
        self.assertEqual(in6_ptop(relay.peeraddr), in6_ptop(peer_ip))
        oid = pkt[DHCP6OptIfaceId]
        cll = pkt[DHCP6OptClientLinkLayerAddr]
        self.assertEqual(cll.optlen, 8)
        self.assertEqual(cll.lltype, 1)
        self.assertEqual(cll.clladdr, peer_mac)

        if fib_id != 0:
            vss = pkt[DHCP6OptVSS]
            self.assertEqual(vss.optlen, 8)
            self.assertEqual(vss.type, 1)
            # the OUI and FIB-id are really 3 and 4 bytes resp.
            # but the tested range is small
            self.assertEqual(ord(vss.data[0]), 0)
            self.assertEqual(ord(vss.data[1]), 0)
            self.assertEqual(ord(vss.data[2]), oui)
            self.assertEqual(ord(vss.data[3]), 0)
            self.assertEqual(ord(vss.data[4]), 0)
            self.assertEqual(ord(vss.data[5]), 0)
            self.assertEqual(ord(vss.data[6]), fib_id)

        # the relay message should be an encoded Solicit
        msg = pkt[DHCP6OptRelayMsg]
        sol = DHCP6_Solicit()
        self.assertEqual(msg.optlen, len(str(sol)))
        self.assertEqual(str(sol), (str(msg[1]))[:msg.optlen])

    def verify_dhcp6_advert(self, pkt, intf, peer):
        ether = pkt[Ether]
        self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff")
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IPv6]
        self.assertEqual(in6_ptop(ip.dst), in6_ptop(peer))
        self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6))

        udp = pkt[UDP]
        self.assertEqual(udp.dport, DHCP6_SERVER_PORT)
        self.assertEqual(udp.sport, DHCP6_CLIENT_PORT)

        # not sure why this is not decoding
        # adv = pkt[DHCP6_Advertise]

    def test_dhcp_proxy(self):
        """ DHCPv4 Proxy """

        #
        # Verify no response to DHCP request without DHCP config
        #
        p_disc_vrf0 = (Ether(dst="ff:ff:ff:ff:ff:ff",
                             src=self.pg2.remote_mac) /
                       IP(src="0.0.0.0", dst="255.255.255.255") /
                       UDP(sport=DHCP4_CLIENT_PORT,
                           dport=DHCP4_SERVER_PORT) /
                       BOOTP(op=1) /
                       DHCP(options=[('message-type', 'discover'), ('end')]))
        pkts_disc_vrf0 = [p_disc_vrf0]
        p_disc_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff",
                             src=self.pg3.remote_mac) /
                       IP(src="0.0.0.0", dst="255.255.255.255") /
                       UDP(sport=DHCP4_CLIENT_PORT,
                           dport=DHCP4_SERVER_PORT) /
                       BOOTP(op=1) /
                       DHCP(options=[('message-type', 'discover'), ('end')]))
        pkts_disc_vrf1 = [p_disc_vrf0]

        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
                                        "DHCP with no configuration")

        #
        # Enable DHCP proxy in VRF 0
        #
        server_addr = self.pg0.remote_ip4n
        src_addr = self.pg0.local_ip4n

        self.vapi.dhcp_proxy_config(server_addr,
                                    src_addr,
                                    rx_table_id=0)

        #
        # Discover packets from the client are dropped because there is no
        # IP address configured on the client facing interface
        #
        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
                                        "Discover DHCP no relay address")

        #
        # Inject a response from the server
        #  dropped, because there is no IP addrees on the
        #  clinet interfce to fill in the option.
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
             BOOTP(op=1) /
             DHCP(options=[('message-type', 'offer'), ('end')]))
        pkts = [p]

        self.send_and_assert_no_replies(self.pg2, pkts,
                                        "Offer DHCP no relay address")

        #
        # configure an IP address on the client facing interface
        #
        self.pg2.config_ip4()

        #
        # Try again with a discover packet
        # Rx'd packet should be to the server address and from the configured
        # source address
        # UDP source ports are unchanged
        # we've no option 82 config so that should be absent
        #
        self.pg2.add_stream(pkts_disc_vrf0)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

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

        option_82 = self.verify_dhcp_discover(rx, self.pg0, src_intf=self.pg2)

        #
        # Create an DHCP offer reply from the server with a correctly formatted
        # option 82. i.e. send back what we just captured
        # The offer, sent mcast to the client, still has option 82.
        #
        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
             BOOTP(op=1) /
             DHCP(options=[('message-type', 'offer'),
                           ('relay_agent_Information', option_82),
                           ('end')]))
        pkts = [p]

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

        rx = self.pg2.get_capture(1)
        rx = rx[0]

        self.verify_dhcp_offer(rx, self.pg2)

        #
        # Bogus Option 82:
        #
        # 1. not our IP address = not checked by VPP? so offer is replayed
        #    to client
        bad_ip = option_82[0:8] + chr(33) + option_82[9:]

        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
             BOOTP(op=1) /
             DHCP(options=[('message-type', 'offer'),
                           ('relay_agent_Information', bad_ip),
                           ('end')]))
        pkts = [p]
        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "DHCP offer option 82 bad address")

        # 2. Not a sw_if_index VPP knows
        bad_if_index = option_82[0:2] + chr(33) + option_82[3:]

        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
             BOOTP(op=1) /
             DHCP(options=[('message-type', 'offer'),
                           ('relay_agent_Information', bad_if_index),
                           ('end')]))
        pkts = [p]
        self.send_and_assert_no_replies(self.pg0, pkts,
                                        "DHCP offer option 82 bad if index")

        #
        # Send a DHCP request in VRF 1. should be dropped.
        #
        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
                                        "DHCP with no configuration VRF 1")

        #
        # Delete the DHCP config in VRF 0
        # Should now drop requests.
        #
        self.vapi.dhcp_proxy_config(server_addr,
                                    src_addr,
                                    rx_table_id=0,
                                    is_add=0)

        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
                                        "DHCP config removed VRF 0")
        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
                                        "DHCP config removed VRF 1")

        #
        # Add DHCP config for VRF 1
        #
        server_addr = self.pg1.remote_ip4n
        src_addr = self.pg1.local_ip4n
        self.vapi.dhcp_proxy_config(server_addr,
                                    src_addr,
                                    rx_table_id=1,
                                    server_table_id=1)

        #
        # Confim DHCP requests ok in VRF 1.
        #  - dropped on IP config on client interface
        #
        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
                                        "DHCP config removed VRF 1")

        #
        # configure an IP address on the client facing interface
        #
        self.pg3.config_ip4()

        self.pg3.add_stream(pkts_disc_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3)

        #
        # Add VSS config
        #  table=1, fib=id=1, oui=4
        self.vapi.dhcp_proxy_set_vss(1, 1, 4)

        self.pg3.add_stream(pkts_disc_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3,
                                  fib_id=1, oui=4)

        #
        # Remove the VSS config
        #  relayed DHCP has default vlaues in the option.
        #
        self.vapi.dhcp_proxy_set_vss(1, 1, 4, is_add=0)

        self.pg3.add_stream(pkts_disc_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3)

        #
        # remove DHCP config to cleanup
        #
        self.vapi.dhcp_proxy_config(server_addr,
                                    src_addr,
                                    rx_table_id=1,
                                    server_table_id=11,
                                    is_add=0)

        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
                                        "DHCP cleanup VRF 0")
        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
                                        "DHCP cleanup VRF 1")

    def test_dhcp6_proxy(self):
        """ DHCPv6 Proxy"""
        #
        # Verify no response to DHCP request without DHCP config
        #
        dhcp_solicit_dst = "ff02::1:2"
        dhcp_solicit_src_vrf0 = mk_ll_addr(self.pg2.remote_mac)
        dhcp_solicit_src_vrf1 = mk_ll_addr(self.pg3.remote_mac)
        server_addr_vrf0 = self.pg0.remote_ip6n
        src_addr_vrf0 = self.pg0.local_ip6n
        server_addr_vrf1 = self.pg1.remote_ip6n
        src_addr_vrf1 = self.pg1.local_ip6n

        dmac = in6_getnsmac(inet_pton(socket.AF_INET6, dhcp_solicit_dst))
        p_solicit_vrf0 = (Ether(dst=dmac, src=self.pg2.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf0,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Solicit())
        pkts_solicit_vrf0 = [p_solicit_vrf0]
        p_solicit_vrf1 = (Ether(dst=dmac, src=self.pg3.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf1,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Solicit())
        pkts_solicit_vrf1 = [p_solicit_vrf1]

        self.send_and_assert_no_replies(self.pg2, pkts_solicit_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg3, pkts_solicit_vrf1,
                                        "DHCP with no configuration")

        #
        # DHCPv6 config in VRF 0.
        # Packets still dropped because the client facing interface has no
        # IPv6 config
        #
        self.vapi.dhcp_proxy_config(server_addr_vrf0,
                                    src_addr_vrf0,
                                    rx_table_id=0,
                                    server_table_id=0,
                                    is_ipv6=1)

        self.send_and_assert_no_replies(self.pg2, pkts_solicit_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg3, pkts_solicit_vrf1,
                                        "DHCP with no configuration")

        #
        # configure an IP address on the client facing interface
        #
        self.pg2.config_ip6()

        #
        # Now the DHCP requests are relayed to the server
        #
        self.pg2.add_stream(pkts_solicit_vrf0)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_solicit(rx, self.pg0,
                                  dhcp_solicit_src_vrf0,
                                  self.pg2.remote_mac)

        #
        # Exception cases for rejected relay responses
        #

        # 1 - not a relay reply
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_Advertise())
        pkts_adv_vrf0 = [p_adv_vrf0]
        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
                                        "DHCP6 not a relay reply")

        # 2 - no relay message option
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply() /
                      DHCP6_Advertise())
        pkts_adv_vrf0 = [p_adv_vrf0]
        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
                                        "DHCP not a relay message")

        # 3 - no circuit ID
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply() /
                      DHCP6OptRelayMsg(optlen=0) /
                      DHCP6_Advertise())
        pkts_adv_vrf0 = [p_adv_vrf0]
        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
                                        "DHCP6 no circuit ID")
        # 4 - wrong circuit ID
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply() /
                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') /
                      DHCP6OptRelayMsg(optlen=0) /
                      DHCP6_Advertise())
        pkts_adv_vrf0 = [p_adv_vrf0]
        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
                                        "DHCP6 wrong circuit ID")

        #
        # Send the relay response (the advertisement)
        #   - no peer address
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply() /
                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x03') /
                      DHCP6OptRelayMsg(optlen=0) /
                      DHCP6_Advertise(trid=1) /
                      DHCP6OptStatusCode(statuscode=0))
        pkts_adv_vrf0 = [p_adv_vrf0]

        self.pg0.add_stream(pkts_adv_vrf0)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg2.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_advert(rx, self.pg2, "::")

        #
        # Send the relay response (the advertisement)
        #   - with peer address
        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf0) /
                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x03') /
                      DHCP6OptRelayMsg(optlen=0) /
                      DHCP6_Advertise(trid=1) /
                      DHCP6OptStatusCode(statuscode=0))
        pkts_adv_vrf0 = [p_adv_vrf0]

        self.pg0.add_stream(pkts_adv_vrf0)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg2.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_advert(rx, self.pg2, dhcp_solicit_src_vrf0)

        #
        # Add all the config for VRF 1
        #
        self.vapi.dhcp_proxy_config(server_addr_vrf1,
                                    src_addr_vrf1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_ipv6=1)
        self.pg3.config_ip6()

        #
        # VRF 1 solicit
        #
        self.pg3.add_stream(pkts_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_solicit(rx, self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg3.remote_mac)

        #
        # VRF 1 Advert
        #
        p_adv_vrf1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
                      IPv6(dst=self.pg1.local_ip6, src=self.pg1.remote_ip6) /
                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
                      DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) /
                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x04') /
                      DHCP6OptRelayMsg(optlen=0) /
                      DHCP6_Advertise(trid=1) /
                      DHCP6OptStatusCode(statuscode=0))
        pkts_adv_vrf1 = [p_adv_vrf1]

        self.pg1.add_stream(pkts_adv_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg3.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_advert(rx, self.pg3, dhcp_solicit_src_vrf1)

        #
        # Add VSS config
        #  table=1, fib=id=1, oui=4
        self.vapi.dhcp_proxy_set_vss(1, 1, 4, is_ip6=1)

        self.pg3.add_stream(pkts_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_solicit(rx, self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg3.remote_mac,
                                  fib_id=1,
                                  oui=4)

        #
        # Remove the VSS config
        #  relayed DHCP has default vlaues in the option.
        #
        self.vapi.dhcp_proxy_set_vss(1, 1, 4, is_ip6=1, is_add=0)

        self.pg3.add_stream(pkts_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)
        rx = rx[0]
        self.verify_dhcp6_solicit(rx, self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg3.remote_mac)

        #
        # Cleanup
        #
        self.vapi.dhcp_proxy_config(server_addr_vrf1,
                                    src_addr_vrf1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_ipv6=1,
                                    is_add=0)
        self.vapi.dhcp_proxy_config(server_addr_vrf1,
                                    src_addr_vrf1,
                                    rx_table_id=0,
                                    server_table_id=0,
                                    is_ipv6=1,
                                    is_add=0)

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