summaryrefslogtreecommitdiffstats
path: root/docs
diff options
context:
space:
mode:
authorNeale Ranns <neale@graphiant.com>2022-03-18 13:05:09 +0000
committerNeale Ranns <neale@graphiant.com>2022-03-24 13:56:43 +0000
commitfbc633f5542be4b0b85963f7dcba9ab143c61d62 (patch)
tree6d5d2223878661230f9e09f18f5bada574f0bc18 /docs
parentbb498ccb1c5d5448fdcb106cacc1ef1bfbc69e16 (diff)
mpls: Set the MTU field in the frag-needed ICMP when doing MPLS fragmentation
Type: fix The reported MTU should include the MPLS label overhead Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: I3df6d2e0b13f49701e187a766a157498dcaafbc0
Diffstat (limited to 'docs')
0 files changed, 0 insertions, 0 deletions
> 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 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 
#!/usr/bin/env python

import unittest
import socket
import struct

from framework import VppTestCase, VppTestRunner, running_extended_tests
from vpp_neighbor import VppNeighbor
from vpp_ip_route import find_route, VppIpTable
from util import mk_ll_addr
import scapy.compat
from scapy.layers.l2 import Ether, getmacbyip, ARP
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6, in6_getnsmac
from scapy.utils6 import 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, DHCP6_Request
from socket import AF_INET, AF_INET6
from scapy.utils import inet_pton, inet_ntop
from scapy.utils6 import in6_ptop
from vpp_papi import mac_pton

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


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

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

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

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

        # create 6 pg interfaces for pg0 to pg5
        self.create_pg_interfaces(range(6))
        self.tables = []

        # pg0 to 2 are IP configured in VRF 0, 1 and 2.
        # pg3 to 5 are non IP-configured in VRF 0, 1 and 2.
        table_id = 0
        for table_id in range(1, 4):
            tbl4 = VppIpTable(self, table_id)
            tbl4.add_vpp_config()
            self.tables.append(tbl4)
            tbl6 = VppIpTable(self, table_id, is_ip6=1)
            tbl6.add_vpp_config()
            self.tables.append(tbl6)

        table_id = 0
        for i in self.pg_interfaces[:3]:
            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[3:]:
            i.admin_up()
            i.set_table_ip4(table_id)
            i.set_table_ip6(table_id)
            table_id += 1

    def tearDown(self):
        for i in self.pg_interfaces[:3]:
            i.unconfig_ip4()
            i.unconfig_ip6()

        for i in self.pg_interfaces:
            i.set_table_ip4(0)
            i.set_table_ip6(0)
            i.admin_down()
        super(TestDHCP, self).tearDown()

    def verify_dhcp_has_option(self, pkt, option, value):
        dhcp = pkt[DHCP]
        found = False

        for i in dhcp.options:
            if type(i) is tuple:
                if i[0] == option:
                    self.assertEqual(i[1], value)
                    found = True

        self.assertTrue(found)

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

        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)
                    elif len(vpn_id) > 0:
                        self.assertEqual(len(data), len(vpn_id)+17)
                    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 vss_type 1,
                        # the 3 byte oui and the 4 byte fib_id
                        self.assertEqual(id_len, 0)
                        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)

                    if id_len > 0:
                        # sub-option 151 encode vss_type of 0
                        # followerd by vpn_id in ascii
                        self.assertEqual(oui, 0)
                        self.assertEqual(ord(data[12]), 151)
                        self.assertEqual(ord(data[13]), id_len+1)
                        self.assertEqual(ord(data[14]), 0)
                        self.assertEqual(data[15:15+id_len], vpn_id)

                        # VSS control sub-option
                        self.assertEqual(ord(data[15+len(vpn_id)]), 152)
                        self.assertEqual(ord(data[16+len(vpn_id)]), 0)

                    found = 1
        self.assertTrue(found)

        return data

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

    def verify_dhcp_offer(self, pkt, intf, vpn_id="", fib_id=0, oui=0):
        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)

        self.verify_dhcp_msg_type(pkt, "offer")
        data = self.validate_relay_options(pkt, intf, intf.local_ip4,
                                           vpn_id, fib_id, oui)

    def verify_orig_dhcp_pkt(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, "0.0.0.0")

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

    def verify_orig_dhcp_discover(self, pkt, intf, hostname, client_id=None,
                                  broadcast=1):
        self.verify_orig_dhcp_pkt(pkt, intf)

        self.verify_dhcp_msg_type(pkt, "discover")
        self.verify_dhcp_has_option(pkt, "hostname", hostname)
        if client_id:
            self.verify_dhcp_has_option(pkt, "client_id", client_id)
        bootp = pkt[BOOTP]
        self.assertEqual(bootp.ciaddr, "0.0.0.0")
        self.assertEqual(bootp.giaddr, "0.0.0.0")
        if broadcast:
            self.assertEqual(bootp.flags, 0x8000)
        else:
            self.assertEqual(bootp.flags, 0x0000)

    def verify_orig_dhcp_request(self, pkt, intf, hostname, ip,
                                 broadcast=1):
        self.verify_orig_dhcp_pkt(pkt, intf)

        self.verify_dhcp_msg_type(pkt, "request")
        self.verify_dhcp_has_option(pkt, "hostname", hostname)
        self.verify_dhcp_has_option(pkt, "requested_addr", ip)
        bootp = pkt[BOOTP]
        self.assertEqual(bootp.ciaddr, "0.0.0.0")
        self.assertEqual(bootp.giaddr, "0.0.0.0")
        if broadcast:
            self.assertEqual(bootp.flags, 0x8000)
        else:
            self.assertEqual(bootp.flags, 0x0000)

    def verify_relayed_dhcp_discover(self, pkt, intf, src_intf=None,
                                     fib_id=0, oui=0,
                                     vpn_id="",
                                     dst_mac=None, dst_ip=None):
        if not dst_mac:
            dst_mac = intf.remote_mac
        if not dst_ip:
            dst_ip = intf.remote_ip4

        ether = pkt[Ether]
        self.assertEqual(ether.dst, dst_mac)
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IP]
        self.assertEqual(ip.dst, dst_ip)
        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,
                                           vpn_id,
                                           fib_id, oui)
        return data

    def verify_dhcp6_solicit(self, pkt, intf,
                             peer_ip, peer_mac,
                             vpn_id="",
                             fib_id=0,
                             oui=0,
                             dst_mac=None,
                             dst_ip=None):
        if not dst_mac:
            dst_mac = intf.remote_mac
        if not dst_ip:
            dst_ip = in6_ptop(intf.remote_ip6)

        ether = pkt[Ether]
        self.assertEqual(ether.dst, dst_mac)
        self.assertEqual(ether.src, intf.local_mac)

        ip = pkt[IPv6]
        self.assertEqual(in6_ptop(ip.dst), dst_ip)
        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)

        id_len = len(vpn_id)

        if fib_id != 0:
            self.assertEqual(id_len, 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)

        if id_len > 0:
            self.assertEqual(oui, 0)
            vss = pkt[DHCP6OptVSS]
            self.assertEqual(vss.optlen, id_len+1)
            self.assertEqual(vss.type, 0)
            self.assertEqual(vss.data[0:id_len], vpn_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 wait_for_no_route(self, address, length,
                          n_tries=50, s_time=1):
        while (n_tries):
            if not find_route(self, address, length):
                return True
            n_tries = n_tries - 1
            self.sleep(s_time)

        return False

    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.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_vrf0 = [p_disc_vrf0]
        p_disc_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff",
                             src=self.pg4.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_vrf1]
        p_disc_vrf2 = (Ether(dst="ff:ff:ff:ff:ff:ff",
                             src=self.pg5.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_vrf2 = [p_disc_vrf2]

        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2,
                                        "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.pg3, pkts_disc_vrf0,
                                        "Discover DHCP no relay address")

        #
        # Inject a response from the server
        #  dropped, because there is no IP addrees on the
        #  client 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.pg3, pkts,
                                        "Offer DHCP no relay address")

        #
        # configure an IP address on the client facing interface
        #
        self.pg3.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.pg3.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_relayed_dhcp_discover(rx, self.pg0,
                                                      src_intf=self.pg3)

        #
        # 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.pg3.get_capture(1)
        rx = rx[0]

        self.verify_dhcp_offer(rx, self.pg3)

        #
        # Bogus Option 82:
        #
        # 1. not our IP address = not checked by VPP? so offer is replayed
        #    to client
        bad_ip = option_82[0:8] + scapy.compat.chb(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] + scapy.compat.chb(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.pg4, 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.pg3, pkts_disc_vrf0,
                                        "DHCP config removed VRF 0")
        self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1,
                                        "DHCP config removed VRF 1")

        #
        # Add DHCP config for VRF 1 & 2
        #
        server_addr1 = self.pg1.remote_ip4n
        src_addr1 = self.pg1.local_ip4n
        self.vapi.dhcp_proxy_config(server_addr1,
                                    src_addr1,
                                    rx_table_id=1,
                                    server_table_id=1)
        server_addr2 = self.pg2.remote_ip4n
        src_addr2 = self.pg2.local_ip4n
        self.vapi.dhcp_proxy_config(server_addr2,
                                    src_addr2,
                                    rx_table_id=2,
                                    server_table_id=2)

        #
        # Confim DHCP requests ok in VRF 1 & 2.
        #  - dropped on IP config on client interface
        #
        self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1,
                                        "DHCP config removed VRF 1")
        self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2,
                                        "DHCP config removed VRF 2")

        #
        # configure an IP address on the client facing interface
        #
        self.pg4.config_ip4()
        self.pg4.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_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg4)

        self.pg5.config_ip4()
        self.pg5.add_stream(pkts_disc_vrf2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()
        rx = self.pg2.get_capture(1)
        rx = rx[0]
        self.verify_relayed_dhcp_discover(rx, self.pg2, src_intf=self.pg5)

        #
        # Add VSS config
        #  table=1, vss_type=1, vpn_index=1, oui=4
        #  table=2, vss_type=0, vpn_id = "ip4-table-2"
        self.vapi.dhcp_proxy_set_vss(1, 1, vpn_index=1, oui=4, is_add=1)
        self.vapi.dhcp_proxy_set_vss(2, 0, "ip4-table-2", is_add=1)

        self.pg4.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_relayed_dhcp_discover(rx, self.pg1,
                                          src_intf=self.pg4,
                                          fib_id=1, oui=4)

        self.pg5.add_stream(pkts_disc_vrf2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg2.get_capture(1)
        rx = rx[0]
        self.verify_relayed_dhcp_discover(rx, self.pg2,
                                          src_intf=self.pg5,
                                          vpn_id="ip4-table-2")

        #
        # Add a second DHCP server in VRF 1
        #  expect clients messages to be relay to both configured servers
        #
        self.pg1.generate_remote_hosts(2)
        server_addr12 = socket.inet_pton(AF_INET, self.pg1.remote_hosts[1].ip4)

        self.vapi.dhcp_proxy_config(server_addr12,
                                    src_addr1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_add=1)

        #
        # We'll need an ARP entry for the server to send it packets
        #
        arp_entry = VppNeighbor(self,
                                self.pg1.sw_if_index,
                                self.pg1.remote_hosts[1].mac,
                                self.pg1.remote_hosts[1].ip4)
        arp_entry.add_vpp_config()

        #
        # Send a discover from the client. expect two relayed messages
        # The frist packet is sent to the second server
        # We're not enforcing that here, it's just the way it is.
        #
        self.pg4.add_stream(pkts_disc_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(2)

        option_82 = self.verify_relayed_dhcp_discover(
            rx[0], self.pg1,
            src_intf=self.pg4,
            dst_mac=self.pg1.remote_hosts[1].mac,
            dst_ip=self.pg1.remote_hosts[1].ip4,
            fib_id=1, oui=4)
        self.verify_relayed_dhcp_discover(rx[1], self.pg1,
                                          src_intf=self.pg4,
                                          fib_id=1, oui=4)

        #
        # Send both packets back. Client gets both.
        #
        p1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
              IP(src=self.pg1.remote_ip4, dst=self.pg1.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')]))
        p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
              IP(src=self.pg1.remote_hosts[1].ip4, dst=self.pg1.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 = [p1, p2]

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

        rx = self.pg4.get_capture(2)

        self.verify_dhcp_offer(rx[0], self.pg4, fib_id=1, oui=4)
        self.verify_dhcp_offer(rx[1], self.pg4, fib_id=1, oui=4)

        #
        # Ensure offers from non-servers are dropeed
        #
        p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
              IP(src="8.8.8.8", dst=self.pg1.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')]))
        self.send_and_assert_no_replies(self.pg1, p2,
                                        "DHCP offer from non-server")

        #
        # Ensure only the discover is sent to multiple servers
        #
        p_req_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff",
                            src=self.pg4.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', 'request'),
                                    ('end')]))

        self.pg4.add_stream(p_req_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        #
        # Remove the second DHCP server
        #
        self.vapi.dhcp_proxy_config(server_addr12,
                                    src_addr1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_add=0)

        #
        # Test we can still relay with the first
        #
        self.pg4.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_relayed_dhcp_discover(rx, self.pg1,
                                          src_intf=self.pg4,
                                          fib_id=1, oui=4)

        #
        # Remove the VSS config
        #  relayed DHCP has default vlaues in the option.
        #
        self.vapi.dhcp_proxy_set_vss(1, is_add=0)
        self.vapi.dhcp_proxy_set_vss(2, is_add=0)

        self.pg4.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_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg4)

        #
        # remove DHCP config to cleanup
        #
        self.vapi.dhcp_proxy_config(server_addr1,
                                    src_addr1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_add=0)
        self.vapi.dhcp_proxy_config(server_addr2,
                                    src_addr2,
                                    rx_table_id=2,
                                    server_table_id=2,
                                    is_add=0)

        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0,
                                        "DHCP cleanup VRF 0")
        self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1,
                                        "DHCP cleanup VRF 1")
        self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2,
                                        "DHCP cleanup VRF 2")

        self.pg3.unconfig_ip4()
        self.pg4.unconfig_ip4()
        self.pg5.unconfig_ip4()

    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.pg3.remote_mac)
        dhcp_solicit_src_vrf1 = mk_ll_addr(self.pg4.remote_mac)
        dhcp_solicit_src_vrf2 = mk_ll_addr(self.pg5.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
        server_addr_vrf2 = self.pg2.remote_ip6n
        src_addr_vrf2 = self.pg2.local_ip6n

        dmac = in6_getnsmac(inet_pton(socket.AF_INET6, dhcp_solicit_dst))
        p_solicit_vrf0 = (Ether(dst=dmac, src=self.pg3.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf0,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Solicit())
        p_solicit_vrf1 = (Ether(dst=dmac, src=self.pg4.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf1,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Solicit())
        p_solicit_vrf2 = (Ether(dst=dmac, src=self.pg5.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf2,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Solicit())

        self.send_and_assert_no_replies(self.pg3, p_solicit_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg4, p_solicit_vrf1,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg5, p_solicit_vrf2,
                                        "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.pg3, p_solicit_vrf0,
                                        "DHCP with no configuration")
        self.send_and_assert_no_replies(self.pg4, p_solicit_vrf1,
                                        "DHCP with no configuration")

        #
        # configure an IP address on the client facing interface
        #
        self.pg3.config_ip6()

        #
        # Now the DHCP requests are relayed to the server
        #
        self.pg3.add_stream(p_solicit_vrf0)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg0.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg0,
                                  dhcp_solicit_src_vrf0,
                                  self.pg3.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())
        self.send_and_assert_no_replies(self.pg3, p_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())
        self.send_and_assert_no_replies(self.pg3, p_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())
        self.send_and_assert_no_replies(self.pg3, p_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())
        self.send_and_assert_no_replies(self.pg3, p_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\x04') /
                      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.pg3.get_capture(1)

        self.verify_dhcp6_advert(rx[0], self.pg3, "::")

        #
        # 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\x04') /
                      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.pg3.get_capture(1)

        self.verify_dhcp6_advert(rx[0], self.pg3, dhcp_solicit_src_vrf0)

        #
        # Add all the config for VRF 1 & 2
        #
        self.vapi.dhcp_proxy_config(server_addr_vrf1,
                                    src_addr_vrf1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_ipv6=1)
        self.pg4.config_ip6()

        self.vapi.dhcp_proxy_config(server_addr_vrf2,
                                    src_addr_vrf2,
                                    rx_table_id=2,
                                    server_table_id=2,
                                    is_ipv6=1)
        self.pg5.config_ip6()

        #
        # VRF 1 solicit
        #
        self.pg4.add_stream(p_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac)

        #
        # VRF 2 solicit
        #
        self.pg5.add_stream(p_solicit_vrf2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg2.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg2,
                                  dhcp_solicit_src_vrf2,
                                  self.pg5.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\x05') /
                      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.pg4.get_capture(1)

        self.verify_dhcp6_advert(rx[0], self.pg4, dhcp_solicit_src_vrf1)

        #
        # Add VSS config
        #  table=1, vss_type=1, vpn_index=1, oui=4
        #  table=2, vss_type=0, vpn_id = "ip6-table-2"
        self.vapi.dhcp_proxy_set_vss(1, 1, oui=4, vpn_index=1, is_ip6=1)
        self.vapi.dhcp_proxy_set_vss(2, 0, "IPv6-table-2", is_ip6=1)

        self.pg4.add_stream(p_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac,
                                  fib_id=1,
                                  oui=4)

        self.pg5.add_stream(p_solicit_vrf2)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg2.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg2,
                                  dhcp_solicit_src_vrf2,
                                  self.pg5.remote_mac,
                                  vpn_id="IPv6-table-2")

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

        self.pg4.add_stream(p_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac)

        #
        # Add a second DHCP server in VRF 1
        #  expect clients messages to be relay to both configured servers
        #
        self.pg1.generate_remote_hosts(2)
        server_addr12 = socket.inet_pton(AF_INET6,
                                         self.pg1.remote_hosts[1].ip6)

        self.vapi.dhcp_proxy_config(server_addr12,
                                    src_addr_vrf1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_ipv6=1)

        #
        # We'll need an ND entry for the server to send it packets
        #
        nd_entry = VppNeighbor(self,
                               self.pg1.sw_if_index,
                               self.pg1.remote_hosts[1].mac,
                               self.pg1.remote_hosts[1].ip6)
        nd_entry.add_vpp_config()

        #
        # Send a discover from the client. expect two relayed messages
        # The frist packet is sent to the second server
        # We're not enforcing that here, it's just the way it is.
        #
        self.pg4.add_stream(p_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(2)

        self.verify_dhcp6_solicit(rx[0], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac)
        self.verify_dhcp6_solicit(rx[1], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac,
                                  dst_mac=self.pg1.remote_hosts[1].mac,
                                  dst_ip=self.pg1.remote_hosts[1].ip6)

        #
        # Send both packets back. Client gets both.
        #
        p1 = (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\x05') /
              DHCP6OptRelayMsg(optlen=0) /
              DHCP6_Advertise(trid=1) /
              DHCP6OptStatusCode(statuscode=0))
        p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_hosts[1].mac) /
              IPv6(dst=self.pg1.local_ip6, src=self.pg1._remote_hosts[1].ip6) /
              UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
              DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) /
              DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') /
              DHCP6OptRelayMsg(optlen=0) /
              DHCP6_Advertise(trid=1) /
              DHCP6OptStatusCode(statuscode=0))

        pkts = [p1, p2]

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

        rx = self.pg4.get_capture(2)

        self.verify_dhcp6_advert(rx[0], self.pg4, dhcp_solicit_src_vrf1)
        self.verify_dhcp6_advert(rx[1], self.pg4, dhcp_solicit_src_vrf1)

        #
        # Ensure only solicit messages are duplicated
        #
        p_request_vrf1 = (Ether(dst=dmac, src=self.pg4.remote_mac) /
                          IPv6(src=dhcp_solicit_src_vrf1,
                               dst=dhcp_solicit_dst) /
                          UDP(sport=DHCP6_SERVER_PORT,
                              dport=DHCP6_CLIENT_PORT) /
                          DHCP6_Request())

        self.pg4.add_stream(p_request_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        #
        # Test we drop DHCP packets from addresses that are not configured as
        # DHCP servers
        #
        p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_hosts[1].mac) /
              IPv6(dst=self.pg1.local_ip6, src="3001::1") /
              UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
              DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) /
              DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') /
              DHCP6OptRelayMsg(optlen=0) /
              DHCP6_Advertise(trid=1) /
              DHCP6OptStatusCode(statuscode=0))
        self.send_and_assert_no_replies(self.pg1, p2,
                                        "DHCP6 not from server")

        #
        # Remove the second DHCP server
        #
        self.vapi.dhcp_proxy_config(server_addr12,
                                    src_addr_vrf1,
                                    rx_table_id=1,
                                    server_table_id=1,
                                    is_ipv6=1,
                                    is_add=0)

        #
        # Test we can still relay with the first
        #
        self.pg4.add_stream(p_solicit_vrf1)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg1.get_capture(1)

        self.verify_dhcp6_solicit(rx[0], self.pg1,
                                  dhcp_solicit_src_vrf1,
                                  self.pg4.remote_mac)

        #
        # Cleanup
        #
        self.vapi.dhcp_proxy_config(server_addr_vrf2,
                                    src_addr_vrf2,
                                    rx_table_id=2,
                                    server_table_id=2,
                                    is_ipv6=1,
                                    is_add=0)
        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_vrf0,
                                    src_addr_vrf0,
                                    rx_table_id=0,
                                    server_table_id=0,
                                    is_ipv6=1,
                                    is_add=0)

        # duplicate delete
        self.vapi.dhcp_proxy_config(server_addr_vrf0,
                                    src_addr_vrf0,
                                    rx_table_id=0,
                                    server_table_id=0,
                                    is_ipv6=1,
                                    is_add=0)
        self.pg3.unconfig_ip6()
        self.pg4.unconfig_ip6()
        self.pg5.unconfig_ip6()

    def test_dhcp_client(self):
        """ DHCP Client"""

        hostname = 'universal-dp'

        self.pg_enable_capture(self.pg_interfaces)

        #
        # Configure DHCP client on PG3 and capture the discover sent
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname)

        rx = self.pg3.get_capture(1)

        self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname)

        #
        # Send back on offer, expect the request
        #
        p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                   IP(src=self.pg3.remote_ip4, dst="255.255.255.255") /
                   UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                   BOOTP(op=1,
                         yiaddr=self.pg3.local_ip4,
                         chaddr=mac_pton(self.pg3.local_mac)) /
                   DHCP(options=[('message-type', 'offer'),
                                 ('server_id', self.pg3.remote_ip4),
                                 'end']))

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

        rx = self.pg3.get_capture(1)
        self.verify_orig_dhcp_request(rx[0], self.pg3, hostname,
                                      self.pg3.local_ip4)

        #
        # Send an acknowledgment
        #
        p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                 IP(src=self.pg3.remote_ip4, dst="255.255.255.255") /
                 UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                 BOOTP(op=1, yiaddr=self.pg3.local_ip4,
                       chaddr=mac_pton(self.pg3.local_mac)) /
                 DHCP(options=[('message-type', 'ack'),
                               ('subnet_mask', "255.255.255.0"),
                               ('router', self.pg3.remote_ip4),
                               ('server_id', self.pg3.remote_ip4),
                               ('lease_time', 43200),
                               'end']))

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

        #
        # We'll get an ARP request for the router address
        #
        rx = self.pg3.get_capture(1)

        self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4)
        self.pg_enable_capture(self.pg_interfaces)

        #
        # At the end of this procedure there should be a connected route
        # in the FIB
        #
        self.assertTrue(find_route(self, self.pg3.local_ip4, 24))
        self.assertTrue(find_route(self, self.pg3.local_ip4, 32))

        # remove the left over ARP entry
        self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index,
                                      self.pg3.remote_mac,
                                      self.pg3.remote_ip4,
                                      is_add=0)

        #
        # remove the DHCP config
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname, is_add=0)

        #
        # and now the route should be gone
        #
        self.assertFalse(find_route(self, self.pg3.local_ip4, 32))
        self.assertFalse(find_route(self, self.pg3.local_ip4, 24))

        #
        # Start the procedure again. this time have VPP send the client-ID
        #
        self.pg3.admin_down()
        self.sleep(1)
        self.pg3.admin_up()
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname,
                                     client_id=self.pg3.local_mac)

        rx = self.pg3.get_capture(1)

        self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname,
                                       self.pg3.local_mac)

        # TODO: VPP DHCP client should not accept DHCP OFFER message with
        # the XID (Transaction ID) not matching the XID of the most recent
        # DHCP DISCOVERY message.
        # Such DHCP OFFER message must be silently discarded - RFC2131.
        # Reported in Jira ticket: VPP-99
        self.pg3.add_stream(p_offer)
        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        rx = self.pg3.get_capture(1)
        self.verify_orig_dhcp_request(rx[0], self.pg3, hostname,
                                      self.pg3.local_ip4)

        #
        # unicast the ack to the offered address
        #
        p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                 IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) /
                 UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                 BOOTP(op=1, yiaddr=self.pg3.local_ip4,
                       chaddr=mac_pton(self.pg3.local_mac)) /
                 DHCP(options=[('message-type', 'ack'),
                               ('subnet_mask', "255.255.255.0"),
                               ('router', self.pg3.remote_ip4),
                               ('server_id', self.pg3.remote_ip4),
                               ('lease_time', 43200),
                               'end']))

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

        #
        # We'll get an ARP request for the router address
        #
        rx = self.pg3.get_capture(1)

        self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4)
        self.pg_enable_capture(self.pg_interfaces)

        #
        # At the end of this procedure there should be a connected route
        # in the FIB
        #
        self.assertTrue(find_route(self, self.pg3.local_ip4, 32))
        self.assertTrue(find_route(self, self.pg3.local_ip4, 24))

        #
        # remove the DHCP config
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname, is_add=0)

        self.assertFalse(find_route(self, self.pg3.local_ip4, 32))
        self.assertFalse(find_route(self, self.pg3.local_ip4, 24))

        #
        # Rince and repeat, this time with VPP configured not to set
        # the braodcast flag in the discover and request messages,
        # and for the server to unicast the responses.
        #
        # Configure DHCP client on PG3 and capture the discover sent
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname,
                                     set_broadcast_flag=0)

        rx = self.pg3.get_capture(1)

        self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname,
                                       broadcast=0)

        #
        # Send back on offer, unicasted to the offered address.
        # Expect the request.
        #
        p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                   IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) /
                   UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                   BOOTP(op=1, yiaddr=self.pg3.local_ip4,
                         chaddr=mac_pton(self.pg3.local_mac)) /
                   DHCP(options=[('message-type', 'offer'),
                                 ('server_id', self.pg3.remote_ip4),
                                 'end']))

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

        rx = self.pg3.get_capture(1)
        self.verify_orig_dhcp_request(rx[0], self.pg3, hostname,
                                      self.pg3.local_ip4,
                                      broadcast=0)

        #
        # Send an acknowledgment
        #
        p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                 IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) /
                 UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                 BOOTP(op=1, yiaddr=self.pg3.local_ip4,
                       chaddr=mac_pton(self.pg3.local_mac)) /
                 DHCP(options=[('message-type', 'ack'),
                               ('subnet_mask', "255.255.255.0"),
                               ('router', self.pg3.remote_ip4),
                               ('server_id', self.pg3.remote_ip4),
                               ('lease_time', 43200),
                               'end']))

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

        #
        # We'll get an ARP request for the router address
        #
        rx = self.pg3.get_capture(1)

        self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4)
        self.pg_enable_capture(self.pg_interfaces)

        #
        # At the end of this procedure there should be a connected route
        # in the FIB
        #
        self.assertTrue(find_route(self, self.pg3.local_ip4, 24))
        self.assertTrue(find_route(self, self.pg3.local_ip4, 32))

        # remove the left over ARP entry
        self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index,
                                      self.pg3.remote_mac,
                                      self.pg3.remote_ip4,
                                      is_add=0)

        #
        # read the DHCP client details from a dump
        #
        clients = self.vapi.dhcp_client_dump()

        self.assertEqual(clients[0].client.sw_if_index,
                         self.pg3.sw_if_index)
        self.assertEqual(clients[0].lease.sw_if_index,
                         self.pg3.sw_if_index)
        self.assertEqual(clients[0].client.hostname.rstrip('\0'),
                         hostname)
        self.assertEqual(clients[0].lease.hostname.rstrip('\0'),
                         hostname)
        self.assertEqual(clients[0].lease.is_ipv6, 0)
        # 0 = DISCOVER, 1 = REQUEST, 2 = BOUND
        self.assertEqual(clients[0].lease.state, 2)
        self.assertEqual(clients[0].lease.mask_width, 24)
        self.assertEqual(clients[0].lease.router_address.rstrip('\0'),
                         self.pg3.remote_ip4n)
        self.assertEqual(clients[0].lease.host_address.rstrip('\0'),
                         self.pg3.local_ip4n)

        #
        # remove the DHCP config
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname, is_add=0)

        #
        # and now the route should be gone
        #
        self.assertFalse(find_route(self, self.pg3.local_ip4, 32))
        self.assertFalse(find_route(self, self.pg3.local_ip4, 24))

        #
        # Start the procedure again. Use requested lease time option.
        #
        self.pg3.admin_down()
        self.sleep(1)
        self.pg3.admin_up()
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname)

        rx = self.pg3.get_capture(1)

        self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname)

        #
        # Send back on offer with requested lease time, expect the request
        #
        lease_time = 1
        p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                   IP(src=self.pg3.remote_ip4, dst='255.255.255.255') /
                   UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                   BOOTP(op=1,
                         yiaddr=self.pg3.local_ip4,
                         chaddr=mac_pton(self.pg3.local_mac)) /
                   DHCP(options=[('message-type', 'offer'),
                                 ('server_id', self.pg3.remote_ip4),
                                 ('lease_time', lease_time),
                                 'end']))

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

        rx = self.pg3.get_capture(1)
        self.verify_orig_dhcp_request(rx[0], self.pg3, hostname,
                                      self.pg3.local_ip4)

        #
        # Send an acknowledgment
        #
        p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) /
                 IP(src=self.pg3.remote_ip4, dst='255.255.255.255') /
                 UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
                 BOOTP(op=1, yiaddr=self.pg3.local_ip4,
                       chaddr=mac_pton(self.pg3.local_mac)) /
                 DHCP(options=[('message-type', 'ack'),
                               ('subnet_mask', '255.255.255.0'),
                               ('router', self.pg3.remote_ip4),
                               ('server_id', self.pg3.remote_ip4),
                               ('lease_time', lease_time),
                               'end']))

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

        #
        # We'll get an ARP request for the router address
        #
        rx = self.pg3.get_capture(1)

        self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4)

        #
        # At the end of this procedure there should be a connected route
        # in the FIB
        #
        self.assertTrue(find_route(self, self.pg3.local_ip4, 32))
        self.assertTrue(find_route(self, self.pg3.local_ip4, 24))

        # remove the left over ARP entry
        self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index,
                                      self.pg3.remote_mac,
                                      self.pg3.remote_ip4,
                                      is_add=0)

        #
        # the route should be gone after the lease expires
        #
        self.assertTrue(self.wait_for_no_route(self.pg3.local_ip4, 32))
        self.assertTrue(self.wait_for_no_route(self.pg3.local_ip4, 24))

        #
        # remove the DHCP config
        #
        self.vapi.dhcp_client_config(self.pg3.sw_if_index, hostname, is_add=0)


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