test/test_dhcp6.py

   1 from socket import AF_INET6, inet_ntop, inet_pton
   2
   3 from scapy.layers.dhcp6 import (
   4     DHCP6_Advertise,
   5     DHCP6OptClientId,
   6     DHCP6OptStatusCode,
   7     DHCP6OptPref,
   8     DHCP6OptIA_PD,
   9     DHCP6OptIAPrefix,
  10     DHCP6OptServerId,
  11     DHCP6_Solicit,
  12     DHCP6_Reply,
  13     DHCP6_Request,
  14     DHCP6_Renew,
  15     DHCP6_Rebind,
  16     DUID_LL,
  17     DHCP6_Release,
  18     DHCP6OptElapsedTime,
  19     DHCP6OptIA_NA,
  20     DHCP6OptIAAddress,
  21 )
  22 from scapy.layers.inet6 import IPv6, Ether, UDP
  23
  24 from framework import VppTestCase
  25 from asfframework import tag_fixme_vpp_workers, tag_run_solo
  26 from vpp_papi import VppEnum
  27 import util
  28 import os
  29
  30
  31 def ip6_normalize(ip6):
  32     return inet_ntop(AF_INET6, inet_pton(AF_INET6, ip6))
  33
  34
  35 class TestDHCPv6DataPlane(VppTestCase):
  36     """DHCPv6 Data Plane Test Case"""
  37
  38     @classmethod
  39     def setUpClass(cls):
  40         super(TestDHCPv6DataPlane, cls).setUpClass()
  41
  42     @classmethod
  43     def tearDownClass(cls):
  44         super(TestDHCPv6DataPlane, cls).tearDownClass()
  45
  46     def setUp(self):
  47         super(TestDHCPv6DataPlane, self).setUp()
  48
  49         self.create_pg_interfaces(range(1))
  50         self.interfaces = list(self.pg_interfaces)
  51         for i in self.interfaces:
  52             i.admin_up()
  53             i.config_ip6()
  54
  55         self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
  56
  57     def tearDown(self):
  58         for i in self.interfaces:
  59             i.unconfig_ip6()
  60             i.admin_down()
  61         super(TestDHCPv6DataPlane, self).tearDown()
  62
  63     def test_dhcp_ia_na_send_solicit_receive_advertise(self):
  64         """Verify DHCPv6 IA NA Solicit packet and Advertise event"""
  65
  66         self.vapi.dhcp6_clients_enable_disable(enable=1)
  67
  68         self.pg_enable_capture(self.pg_interfaces)
  69         self.pg_start()
  70         address = {"address": "1:2:3::5", "preferred_time": 60, "valid_time": 120}
  71         self.vapi.dhcp6_send_client_message(
  72             server_index=0xFFFFFFFF,
  73             mrc=1,
  74             msg_type=VppEnum.vl_api_dhcpv6_msg_type_t.DHCPV6_MSG_API_SOLICIT,
  75             sw_if_index=self.pg0.sw_if_index,
  76             T1=20,
  77             T2=40,
  78             addresses=[address],
  79             n_addresses=len([address]),
  80         )
  81         rx_list = self.pg0.get_capture(1)
  82         self.assertEqual(len(rx_list), 1)
  83         packet = rx_list[0]
  84
  85         self.assertEqual(packet.haslayer(IPv6), 1)
  86         self.assertEqual(packet[IPv6].haslayer(DHCP6_Solicit), 1)
  87
  88         client_duid = packet[DHCP6OptClientId].duid
  89         trid = packet[DHCP6_Solicit].trid
  90
  91         dst = ip6_normalize(packet[IPv6].dst)
  92         dst2 = ip6_normalize("ff02::1:2")
  93         self.assert_equal(dst, dst2)
  94         src = ip6_normalize(packet[IPv6].src)
  95         src2 = ip6_normalize(self.pg0.local_ip6_ll)
  96         self.assert_equal(src, src2)
  97         ia_na = packet[DHCP6OptIA_NA]
  98         self.assert_equal(ia_na.T1, 20)
  99         self.assert_equal(ia_na.T2, 40)
 100         self.assert_equal(len(ia_na.ianaopts), 1)
 101         address = ia_na.ianaopts[0]
 102         self.assert_equal(address.addr, "1:2:3::5")
 103         self.assert_equal(address.preflft, 60)
 104         self.assert_equal(address.validlft, 120)
 105
 106         self.vapi.want_dhcp6_reply_events(enable_disable=1, pid=os.getpid())
 107
 108         try:
 109             ia_na_opts = DHCP6OptIAAddress(addr="7:8::2", preflft=60, validlft=120)
 110             p = (
 111                 Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
 112                 / IPv6(
 113                     src=util.mk_ll_addr(self.pg0.remote_mac), dst=self.pg0.local_ip6_ll
 114                 )
 115                 / UDP(sport=547, dport=546)
 116                 / DHCP6_Advertise(trid=trid)
 117                 / DHCP6OptServerId(duid=self.server_duid)
 118                 / DHCP6OptClientId(duid=client_duid)
 119                 / DHCP6OptPref(prefval=7)
 120                 / DHCP6OptStatusCode(statuscode=1)
 121                 / DHCP6OptIA_NA(iaid=1, T1=20, T2=40, ianaopts=ia_na_opts)
 122             )
 123             self.pg0.add_stream([p])
 124             self.pg_start()
 125
 126             ev = self.vapi.wait_for_event(1, "dhcp6_reply_event")
 127
 128             self.assert_equal(ev.preference, 7)
 129             self.assert_equal(ev.status_code, 1)
 130             self.assert_equal(ev.T1, 20)
 131             self.assert_equal(ev.T2, 40)
 132
 133             reported_address = ev.addresses[0]
 134             address = ia_na_opts.getfieldval("addr")
 135             self.assert_equal(str(reported_address.address), address)
 136             self.assert_equal(
 137                 reported_address.preferred_time, ia_na_opts.getfieldval("preflft")
 138             )
 139             self.assert_equal(
 140                 reported_address.valid_time, ia_na_opts.getfieldval("validlft")
 141             )
 142
 143         finally:
 144             self.vapi.want_dhcp6_reply_events(enable_disable=0)
 145         self.vapi.dhcp6_clients_enable_disable(enable=0)
 146
 147     def test_dhcp_pd_send_solicit_receive_advertise(self):
 148         """Verify DHCPv6 PD Solicit packet and Advertise event"""
 149
 150         self.vapi.dhcp6_clients_enable_disable(enable=1)
 151
 152         self.pg_enable_capture(self.pg_interfaces)
 153         self.pg_start()
 154
 155         prefix = {
 156             "prefix": {"address": "1:2:3::", "len": 50},
 157             "preferred_time": 60,
 158             "valid_time": 120,
 159         }
 160         prefixes = [prefix]
 161         self.vapi.dhcp6_pd_send_client_message(
 162             server_index=0xFFFFFFFF,
 163             mrc=1,
 164             msg_type=VppEnum.vl_api_dhcpv6_msg_type_t.DHCPV6_MSG_API_SOLICIT,
 165             sw_if_index=self.pg0.sw_if_index,
 166             T1=20,
 167             T2=40,
 168             prefixes=prefixes,
 169             n_prefixes=len(prefixes),
 170         )
 171         rx_list = self.pg0.get_capture(1)
 172         self.assertEqual(len(rx_list), 1)
 173         packet = rx_list[0]
 174
 175         self.assertEqual(packet.haslayer(IPv6), 1)
 176         self.assertEqual(packet[IPv6].haslayer(DHCP6_Solicit), 1)
 177
 178         client_duid = packet[DHCP6OptClientId].duid
 179         trid = packet[DHCP6_Solicit].trid
 180
 181         dst = ip6_normalize(packet[IPv6].dst)
 182         dst2 = ip6_normalize("ff02::1:2")
 183         self.assert_equal(dst, dst2)
 184         src = ip6_normalize(packet[IPv6].src)
 185         src2 = ip6_normalize(self.pg0.local_ip6_ll)
 186         self.assert_equal(src, src2)
 187         ia_pd = packet[DHCP6OptIA_PD]
 188         self.assert_equal(ia_pd.T1, 20)
 189         self.assert_equal(ia_pd.T2, 40)
 190         self.assert_equal(len(ia_pd.iapdopt), 1)
 191         prefix = ia_pd.iapdopt[0]
 192         self.assert_equal(prefix.prefix, "1:2:3::")
 193         self.assert_equal(prefix.plen, 50)
 194         self.assert_equal(prefix.preflft, 60)
 195         self.assert_equal(prefix.validlft, 120)
 196
 197         self.vapi.want_dhcp6_pd_reply_events(enable_disable=1, pid=os.getpid())
 198
 199         try:
 200             ia_pd_opts = DHCP6OptIAPrefix(
 201                 prefix="7:8::", plen=56, preflft=60, validlft=120
 202             )
 203             p = (
 204                 Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
 205                 / IPv6(
 206                     src=util.mk_ll_addr(self.pg0.remote_mac), dst=self.pg0.local_ip6_ll
 207                 )
 208                 / UDP(sport=547, dport=546)
 209                 / DHCP6_Advertise(trid=trid)
 210                 / DHCP6OptServerId(duid=self.server_duid)
 211                 / DHCP6OptClientId(duid=client_duid)
 212                 / DHCP6OptPref(prefval=7)
 213                 / DHCP6OptStatusCode(statuscode=1)
 214                 / DHCP6OptIA_PD(iaid=1, T1=20, T2=40, iapdopt=ia_pd_opts)
 215             )
 216             self.pg0.add_stream([p])
 217             self.pg_start()
 218
 219             ev = self.vapi.wait_for_event(1, "dhcp6_pd_reply_event")
 220
 221             self.assert_equal(ev.preference, 7)
 222             self.assert_equal(ev.status_code, 1)
 223             self.assert_equal(ev.T1, 20)
 224             self.assert_equal(ev.T2, 40)
 225
 226             reported_prefix = ev.prefixes[0]
 227             prefix = ia_pd_opts.getfieldval("prefix")
 228             self.assert_equal(str(reported_prefix.prefix).split("/")[0], prefix)
 229             self.assert_equal(
 230                 int(str(reported_prefix.prefix).split("/")[1]),
 231                 ia_pd_opts.getfieldval("plen"),
 232             )
 233             self.assert_equal(
 234                 reported_prefix.preferred_time, ia_pd_opts.getfieldval("preflft")
 235             )
 236             self.assert_equal(
 237                 reported_prefix.valid_time, ia_pd_opts.getfieldval("validlft")
 238             )
 239
 240         finally:
 241             self.vapi.want_dhcp6_pd_reply_events(enable_disable=0)
 242         self.vapi.dhcp6_clients_enable_disable(enable=0)
 243
 244
 245 @tag_run_solo
 246 class TestDHCPv6IANAControlPlane(VppTestCase):
 247     """DHCPv6 IA NA Control Plane Test Case"""
 248
 249     @classmethod
 250     def setUpClass(cls):
 251         super(TestDHCPv6IANAControlPlane, cls).setUpClass()
 252
 253     @classmethod
 254     def tearDownClass(cls):
 255         super(TestDHCPv6IANAControlPlane, cls).tearDownClass()
 256
 257     def setUp(self):
 258         super(TestDHCPv6IANAControlPlane, self).setUp()
 259
 260         self.create_pg_interfaces(range(1))
 261         self.interfaces = list(self.pg_interfaces)
 262         for i in self.interfaces:
 263             i.admin_up()
 264
 265         self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
 266         self.client_duid = None
 267         self.T1 = 1
 268         self.T2 = 2
 269
 270         fib = self.vapi.ip_route_dump(0, True)
 271         self.initial_addresses = set(self.get_interface_addresses(fib, self.pg0))
 272
 273         self.pg_enable_capture(self.pg_interfaces)
 274         self.pg_start()
 275
 276         self.vapi.dhcp6_client_enable_disable(
 277             sw_if_index=self.pg0.sw_if_index, enable=1
 278         )
 279
 280     def tearDown(self):
 281         self.vapi.dhcp6_client_enable_disable(
 282             sw_if_index=self.pg0.sw_if_index, enable=0
 283         )
 284
 285         for i in self.interfaces:
 286             i.admin_down()
 287
 288         super(TestDHCPv6IANAControlPlane, self).tearDown()
 289
 290     @staticmethod
 291     def get_interface_addresses(fib, pg):
 292         lst = []
 293         for entry in fib:
 294             if entry.route.prefix.prefixlen == 128:
 295                 path = entry.route.paths[0]
 296                 if path.sw_if_index == pg.sw_if_index:
 297                     lst.append(str(entry.route.prefix.network_address))
 298         return lst
 299
 300     def get_addresses(self):
 301         fib = self.vapi.ip_route_dump(0, True)
 302         addresses = set(self.get_interface_addresses(fib, self.pg0))
 303         return addresses.difference(self.initial_addresses)
 304
 305     def validate_duid_ll(self, duid):
 306         DUID_LL(duid)
 307
 308     def validate_packet(self, packet, msg_type, is_resend=False):
 309         try:
 310             self.assertEqual(packet.haslayer(msg_type), 1)
 311             client_duid = packet[DHCP6OptClientId].duid
 312             if self.client_duid is None:
 313                 self.client_duid = client_duid
 314                 self.validate_duid_ll(client_duid)
 315             else:
 316                 self.assertEqual(self.client_duid, client_duid)
 317             if msg_type != DHCP6_Solicit and msg_type != DHCP6_Rebind:
 318                 server_duid = packet[DHCP6OptServerId].duid
 319                 self.assertEqual(server_duid, self.server_duid)
 320             if is_resend:
 321                 self.assertEqual(self.trid, packet[msg_type].trid)
 322             else:
 323                 self.trid = packet[msg_type].trid
 324             ip = packet[IPv6]
 325             udp = packet[UDP]
 326             self.assertEqual(ip.dst, "ff02::1:2")
 327             self.assertEqual(udp.sport, 546)
 328             self.assertEqual(udp.dport, 547)
 329             dhcpv6 = packet[msg_type]
 330             elapsed_time = dhcpv6[DHCP6OptElapsedTime]
 331             if is_resend:
 332                 self.assertNotEqual(elapsed_time.elapsedtime, 0)
 333             else:
 334                 self.assertEqual(elapsed_time.elapsedtime, 0)
 335         except BaseException:
 336             packet.show()
 337             raise
 338
 339     def wait_for_packet(self, msg_type, timeout=None, is_resend=False):
 340         if timeout is None:
 341             timeout = 3
 342         rx_list = self.pg0.get_capture(1, timeout=timeout)
 343         packet = rx_list[0]
 344         self.validate_packet(packet, msg_type, is_resend=is_resend)
 345
 346     def wait_for_solicit(self, timeout=None, is_resend=False):
 347         self.wait_for_packet(DHCP6_Solicit, timeout, is_resend=is_resend)
 348
 349     def wait_for_request(self, timeout=None, is_resend=False):
 350         self.wait_for_packet(DHCP6_Request, timeout, is_resend=is_resend)
 351
 352     def wait_for_renew(self, timeout=None, is_resend=False):
 353         self.wait_for_packet(DHCP6_Renew, timeout, is_resend=is_resend)
 354
 355     def wait_for_rebind(self, timeout=None, is_resend=False):
 356         self.wait_for_packet(DHCP6_Rebind, timeout, is_resend=is_resend)
 357
 358     def wait_for_release(self, timeout=None, is_resend=False):
 359         self.wait_for_packet(DHCP6_Release, timeout, is_resend=is_resend)
 360
 361     def send_packet(self, msg_type, t1=None, t2=None, ianaopts=None):
 362         if t1 is None:
 363             t1 = self.T1
 364         if t2 is None:
 365             t2 = self.T2
 366         if ianaopts is None:
 367             opt_ia_na = DHCP6OptIA_NA(iaid=1, T1=t1, T2=t2)
 368         else:
 369             opt_ia_na = DHCP6OptIA_NA(iaid=1, T1=t1, T2=t2, ianaopts=ianaopts)
 370         p = (
 371             Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
 372             / IPv6(src=util.mk_ll_addr(self.pg0.remote_mac), dst=self.pg0.local_ip6_ll)
 373             / UDP(sport=547, dport=546)
 374             / msg_type(trid=self.trid)
 375             / DHCP6OptServerId(duid=self.server_duid)
 376             / DHCP6OptClientId(duid=self.client_duid)
 377             / opt_ia_na
 378         )
 379         self.pg0.add_stream([p])
 380         self.pg_enable_capture(self.pg_interfaces)
 381         self.pg_start()
 382
 383     def send_advertise(self, t1=None, t2=None, ianaopts=None):
 384         self.send_packet(DHCP6_Advertise, t1, t2, ianaopts)
 385
 386     def send_reply(self, t1=None, t2=None, ianaopts=None):
 387         self.send_packet(DHCP6_Reply, t1, t2, ianaopts)
 388
 389     def test_T1_and_T2_timeouts(self):
 390         """Test T1 and T2 timeouts"""
 391
 392         self.wait_for_solicit()
 393         self.send_advertise()
 394         self.wait_for_request()
 395         self.send_reply()
 396
 397         self.sleep(1)
 398
 399         self.wait_for_renew()
 400
 401         self.pg_enable_capture(self.pg_interfaces)
 402
 403         self.sleep(1)
 404
 405         self.wait_for_rebind()
 406
 407     def test_addresses(self):
 408         """Test handling of addresses"""
 409
 410         ia_na_opts = DHCP6OptIAAddress(addr="7:8::2", preflft=1, validlft=2)
 411
 412         self.wait_for_solicit()
 413         self.send_advertise(t1=20, t2=40, ianaopts=ia_na_opts)
 414         self.wait_for_request()
 415         self.send_reply(t1=20, t2=40, ianaopts=ia_na_opts)
 416         self.sleep(0.1)
 417
 418         # check FIB for new address
 419         new_addresses = self.get_addresses()
 420         self.assertEqual(len(new_addresses), 1)
 421         addr = list(new_addresses)[0]
 422         self.assertEqual(addr, "7:8::2")
 423
 424         self.sleep(2)
 425
 426         # check that the address is deleted
 427         fib = self.vapi.ip_route_dump(0, True)
 428         addresses = set(self.get_interface_addresses(fib, self.pg0))
 429         new_addresses = addresses.difference(self.initial_addresses)
 430         self.assertEqual(len(new_addresses), 0)
 431
 432     def test_sending_client_messages_solicit(self):
 433         """VPP receives messages from DHCPv6 client"""
 434
 435         self.wait_for_solicit()
 436         self.send_packet(DHCP6_Solicit)
 437         self.send_packet(DHCP6_Request)
 438         self.send_packet(DHCP6_Renew)
 439         self.send_packet(DHCP6_Rebind)
 440         self.sleep(1)
 441         self.wait_for_solicit(is_resend=True)
 442
 443     def test_sending_inappropriate_packets(self):
 444         """Server sends messages with inappropriate message types"""
 445
 446         self.wait_for_solicit()
 447         self.send_reply()
 448         self.wait_for_solicit(is_resend=True)
 449         self.send_advertise()
 450         self.wait_for_request()
 451         self.send_advertise()
 452         self.wait_for_request(is_resend=True)
 453         self.send_reply()
 454         self.wait_for_renew()
 455
 456     def test_no_address_available_in_advertise(self):
 457         """Advertise message contains NoAddrsAvail status code"""
 458
 459         self.wait_for_solicit()
 460         noavail = DHCP6OptStatusCode(statuscode=2)  # NoAddrsAvail
 461         self.send_advertise(ianaopts=noavail)
 462         self.wait_for_solicit(is_resend=True)
 463
 464     def test_preferred_greater_than_valid_lifetime(self):
 465         """Preferred lifetime is greater than valid lifetime"""
 466
 467         self.wait_for_solicit()
 468         self.send_advertise()
 469         self.wait_for_request()
 470         ia_na_opts = DHCP6OptIAAddress(addr="7:8::2", preflft=4, validlft=3)
 471         self.send_reply(ianaopts=ia_na_opts)
 472
 473         self.sleep(0.5)
 474
 475         # check FIB contains no addresses
 476         fib = self.vapi.ip_route_dump(0, True)
 477         addresses = set(self.get_interface_addresses(fib, self.pg0))
 478         new_addresses = addresses.difference(self.initial_addresses)
 479         self.assertEqual(len(new_addresses), 0)
 480
 481     def test_T1_greater_than_T2(self):
 482         """T1 is greater than T2"""
 483
 484         self.wait_for_solicit()
 485         self.send_advertise()
 486         self.wait_for_request()
 487         ia_na_opts = DHCP6OptIAAddress(addr="7:8::2", preflft=4, validlft=8)
 488         self.send_reply(t1=80, t2=40, ianaopts=ia_na_opts)
 489
 490         self.sleep(0.5)
 491
 492         # check FIB contains no addresses
 493         fib = self.vapi.ip_route_dump(0, True)
 494         addresses = set(self.get_interface_addresses(fib, self.pg0))
 495         new_addresses = addresses.difference(self.initial_addresses)
 496         self.assertEqual(len(new_addresses), 0)
 497
 498
 499 @tag_fixme_vpp_workers
 500 class TestDHCPv6PDControlPlane(VppTestCase):
 501     """DHCPv6 PD Control Plane Test Case"""
 502
 503     @classmethod
 504     def setUpClass(cls):
 505         super(TestDHCPv6PDControlPlane, cls).setUpClass()
 506
 507     @classmethod
 508     def tearDownClass(cls):
 509         super(TestDHCPv6PDControlPlane, cls).tearDownClass()
 510
 511     def setUp(self):
 512         super(TestDHCPv6PDControlPlane, self).setUp()
 513
 514         self.create_pg_interfaces(range(2))
 515         self.interfaces = list(self.pg_interfaces)
 516         for i in self.interfaces:
 517             i.admin_up()
 518
 519         self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
 520         self.client_duid = None
 521         self.T1 = 1
 522         self.T2 = 2
 523
 524         fib = self.vapi.ip_route_dump(0, True)
 525         self.initial_addresses = set(self.get_interface_addresses(fib, self.pg1))
 526
 527         self.pg_enable_capture(self.pg_interfaces)
 528         self.pg_start()
 529
 530         self.prefix_group = "my-pd-prefix-group"
 531
 532         self.vapi.dhcp6_pd_client_enable_disable(
 533             enable=1, sw_if_index=self.pg0.sw_if_index, prefix_group=self.prefix_group
 534         )
 535
 536     def tearDown(self):
 537         self.vapi.dhcp6_pd_client_enable_disable(self.pg0.sw_if_index, enable=0)
 538
 539         for i in self.interfaces:
 540             i.admin_down()
 541
 542         super(TestDHCPv6PDControlPlane, self).tearDown()
 543
 544     @staticmethod
 545     def get_interface_addresses(fib, pg):
 546         lst = []
 547         for entry in fib:
 548             if entry.route.prefix.prefixlen == 128:
 549                 path = entry.route.paths[0]
 550                 if path.sw_if_index == pg.sw_if_index:
 551                     lst.append(str(entry.route.prefix.network_address))
 552         return lst
 553
 554     def get_addresses(self):
 555         fib = self.vapi.ip_route_dump(0, True)
 556         addresses = set(self.get_interface_addresses(fib, self.pg1))
 557         return addresses.difference(self.initial_addresses)
 558
 559     def validate_duid_ll(self, duid):
 560         DUID_LL(duid)
 561
 562     def validate_packet(self, packet, msg_type, is_resend=False):
 563         try:
 564             self.assertEqual(packet.haslayer(msg_type), 1)
 565             client_duid = packet[DHCP6OptClientId].duid
 566             if self.client_duid is None:
 567                 self.client_duid = client_duid
 568                 self.validate_duid_ll(client_duid)
 569             else:
 570                 self.assertEqual(self.client_duid, client_duid)
 571             if msg_type != DHCP6_Solicit and msg_type != DHCP6_Rebind:
 572                 server_duid = packet[DHCP6OptServerId].duid
 573                 self.assertEqual(server_duid, self.server_duid)
 574             if is_resend:
 575                 self.assertEqual(self.trid, packet[msg_type].trid)
 576             else:
 577                 self.trid = packet[msg_type].trid
 578             ip = packet[IPv6]
 579             udp = packet[UDP]
 580             self.assertEqual(ip.dst, "ff02::1:2")
 581             self.assertEqual(udp.sport, 546)
 582             self.assertEqual(udp.dport, 547)
 583             dhcpv6 = packet[msg_type]
 584             elapsed_time = dhcpv6[DHCP6OptElapsedTime]
 585             if is_resend:
 586                 self.assertNotEqual(elapsed_time.elapsedtime, 0)
 587             else:
 588                 self.assertEqual(elapsed_time.elapsedtime, 0)
 589         except BaseException:
 590             packet.show()
 591             raise
 592
 593     def wait_for_packet(self, msg_type, timeout=None, is_resend=False):
 594         if timeout is None:
 595             timeout = 3
 596         rx_list = self.pg0.get_capture(1, timeout=timeout)
 597         packet = rx_list[0]
 598         self.validate_packet(packet, msg_type, is_resend=is_resend)
 599
 600     def wait_for_solicit(self, timeout=None, is_resend=False):
 601         self.wait_for_packet(DHCP6_Solicit, timeout, is_resend=is_resend)
 602
 603     def wait_for_request(self, timeout=None, is_resend=False):
 604         self.wait_for_packet(DHCP6_Request, timeout, is_resend=is_resend)
 605
 606     def wait_for_renew(self, timeout=None, is_resend=False):
 607         self.wait_for_packet(DHCP6_Renew, timeout, is_resend=is_resend)
 608
 609     def wait_for_rebind(self, timeout=None, is_resend=False):
 610         self.wait_for_packet(DHCP6_Rebind, timeout, is_resend=is_resend)
 611
 612     def wait_for_release(self, timeout=None, is_resend=False):
 613         self.wait_for_packet(DHCP6_Release, timeout, is_resend=is_resend)
 614
 615     def send_packet(self, msg_type, t1=None, t2=None, iapdopt=None):
 616         if t1 is None:
 617             t1 = self.T1
 618         if t2 is None:
 619             t2 = self.T2
 620         if iapdopt is None:
 621             opt_ia_pd = DHCP6OptIA_PD(iaid=1, T1=t1, T2=t2)
 622         else:
 623             opt_ia_pd = DHCP6OptIA_PD(iaid=1, T1=t1, T2=t2, iapdopt=iapdopt)
 624         p = (
 625             Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
 626             / IPv6(src=util.mk_ll_addr(self.pg0.remote_mac), dst=self.pg0.local_ip6_ll)
 627             / UDP(sport=547, dport=546)
 628             / msg_type(trid=self.trid)
 629             / DHCP6OptServerId(duid=self.server_duid)
 630             / DHCP6OptClientId(duid=self.client_duid)
 631             / opt_ia_pd
 632         )
 633         self.pg0.add_stream([p])
 634         self.pg_enable_capture(self.pg_interfaces)
 635         self.pg_start()
 636
 637     def send_advertise(self, t1=None, t2=None, iapdopt=None):
 638         self.send_packet(DHCP6_Advertise, t1, t2, iapdopt)
 639
 640     def send_reply(self, t1=None, t2=None, iapdopt=None):
 641         self.send_packet(DHCP6_Reply, t1, t2, iapdopt)
 642
 643     def test_T1_and_T2_timeouts(self):
 644         """Test T1 and T2 timeouts"""
 645
 646         self.wait_for_solicit()
 647         self.send_advertise()
 648         self.wait_for_request()
 649         self.send_reply()
 650
 651         self.sleep(1)
 652
 653         self.wait_for_renew()
 654
 655         self.pg_enable_capture(self.pg_interfaces)
 656
 657         self.sleep(1)
 658
 659         self.wait_for_rebind()
 660
 661     def test_prefixes(self):
 662         """Test handling of prefixes"""
 663
 664         address1 = "::2:0:0:0:405/60"
 665         address2 = "::76:0:0:0:406/62"
 666         try:
 667             self.vapi.ip6_add_del_address_using_prefix(
 668                 sw_if_index=self.pg1.sw_if_index,
 669                 address_with_prefix=address1,
 670                 prefix_group=self.prefix_group,
 671             )
 672
 673             ia_pd_opts = DHCP6OptIAPrefix(
 674                 prefix="7:8::", plen=56, preflft=2, validlft=3
 675             )
 676
 677             self.wait_for_solicit()
 678             self.send_advertise(t1=20, t2=40, iapdopt=ia_pd_opts)
 679             self.wait_for_request()
 680             self.send_reply(t1=20, t2=40, iapdopt=ia_pd_opts)
 681             self.sleep(0.1)
 682
 683             # check FIB for new address
 684             new_addresses = self.get_addresses()
 685             self.assertEqual(len(new_addresses), 1)
 686             addr = list(new_addresses)[0]
 687             self.assertEqual(addr, "7:8:0:2::405")
 688
 689             self.sleep(1)
 690
 691             self.vapi.ip6_add_del_address_using_prefix(
 692                 sw_if_index=self.pg1.sw_if_index,
 693                 address_with_prefix=address2,
 694                 prefix_group=self.prefix_group,
 695             )
 696
 697             self.sleep(1)
 698
 699             # check FIB contains 2 addresses
 700             fib = self.vapi.ip_route_dump(0, True)
 701             addresses = set(self.get_interface_addresses(fib, self.pg1))
 702             new_addresses = addresses.difference(self.initial_addresses)
 703             self.assertEqual(len(new_addresses), 2)
 704             addr1 = list(new_addresses)[0]
 705             addr2 = list(new_addresses)[1]
 706             if addr1 == "7:8:0:76::406":
 707                 addr1, addr2 = addr2, addr1
 708             self.assertEqual(addr1, "7:8:0:2::405")
 709             self.assertEqual(addr2, "7:8:0:76::406")
 710
 711             self.sleep(1)
 712
 713             # check that the addresses are deleted
 714             fib = self.vapi.ip_route_dump(0, True)
 715             addresses = set(self.get_interface_addresses(fib, self.pg1))
 716             new_addresses = addresses.difference(self.initial_addresses)
 717             self.assertEqual(len(new_addresses), 0)
 718
 719         finally:
 720             if address1 is not None:
 721                 self.vapi.ip6_add_del_address_using_prefix(
 722                     sw_if_index=self.pg1.sw_if_index,
 723                     address_with_prefix=address1,
 724                     prefix_group=self.prefix_group,
 725                     is_add=0,
 726                 )
 727             if address2 is not None:
 728                 self.vapi.ip6_add_del_address_using_prefix(
 729                     sw_if_index=self.pg1.sw_if_index,
 730                     address_with_prefix=address2,
 731                     prefix_group=self.prefix_group,
 732                     is_add=0,
 733                 )
 734
 735     def test_sending_client_messages_solicit(self):
 736         """VPP receives messages from DHCPv6 client"""
 737
 738         self.wait_for_solicit()
 739         self.send_packet(DHCP6_Solicit)
 740         self.send_packet(DHCP6_Request)
 741         self.send_packet(DHCP6_Renew)
 742         self.send_packet(DHCP6_Rebind)
 743         self.sleep(1)
 744         self.wait_for_solicit(is_resend=True)
 745
 746     def test_sending_inappropriate_packets(self):
 747         """Server sends messages with inappropriate message types"""
 748
 749         self.wait_for_solicit()
 750         self.send_reply()
 751         self.wait_for_solicit(is_resend=True)
 752         self.send_advertise()
 753         self.wait_for_request()
 754         self.send_advertise()
 755         self.wait_for_request(is_resend=True)
 756         self.send_reply()
 757         self.wait_for_renew()
 758
 759     def test_no_prefix_available_in_advertise(self):
 760         """Advertise message contains NoPrefixAvail status code"""
 761
 762         self.wait_for_solicit()
 763         noavail = DHCP6OptStatusCode(statuscode=6)  # NoPrefixAvail
 764         self.send_advertise(iapdopt=noavail)
 765         self.wait_for_solicit(is_resend=True)
 766
 767     def test_preferred_greater_than_valid_lifetime(self):
 768         """Preferred lifetime is greater than valid lifetime"""
 769
 770         address1 = "::2:0:0:0:405/60"
 771         try:
 772             self.vapi.ip6_add_del_address_using_prefix(
 773                 sw_if_index=self.pg1.sw_if_index,
 774                 address_with_prefix=address1,
 775                 prefix_group=self.prefix_group,
 776             )
 777
 778             self.wait_for_solicit()
 779             self.send_advertise()
 780             self.wait_for_request()
 781             ia_pd_opts = DHCP6OptIAPrefix(
 782                 prefix="7:8::", plen=56, preflft=4, validlft=3
 783             )
 784             self.send_reply(iapdopt=ia_pd_opts)
 785
 786             self.sleep(0.5)
 787
 788             # check FIB contains no addresses
 789             fib = self.vapi.ip_route_dump(0, True)
 790             addresses = set(self.get_interface_addresses(fib, self.pg1))
 791             new_addresses = addresses.difference(self.initial_addresses)
 792             self.assertEqual(len(new_addresses), 0)
 793
 794         finally:
 795             self.vapi.ip6_add_del_address_using_prefix(
 796                 sw_if_index=self.pg1.sw_if_index,
 797                 address_with_prefix=address1,
 798                 prefix_group=self.prefix_group,
 799                 is_add=0,
 800             )
 801
 802     def test_T1_greater_than_T2(self):
 803         """T1 is greater than T2"""
 804
 805         address1 = "::2:0:0:0:405/60"
 806         try:
 807             self.vapi.ip6_add_del_address_using_prefix(
 808                 sw_if_index=self.pg1.sw_if_index,
 809                 address_with_prefix=address1,
 810                 prefix_group=self.prefix_group,
 811             )
 812
 813             self.wait_for_solicit()
 814             self.send_advertise()
 815             self.wait_for_request()
 816             ia_pd_opts = DHCP6OptIAPrefix(
 817                 prefix="7:8::", plen=56, preflft=4, validlft=8
 818             )
 819             self.send_reply(t1=80, t2=40, iapdopt=ia_pd_opts)
 820
 821             self.sleep(0.5)
 822
 823             # check FIB contains no addresses
 824             fib = self.vapi.ip_route_dump(0, True)
 825             addresses = set(self.get_interface_addresses(fib, self.pg1))
 826             new_addresses = addresses.difference(self.initial_addresses)
 827             self.assertEqual(len(new_addresses), 0)
 828
 829         finally:
 830             self.vapi.ip6_add_del_address_using_prefix(
 831                 sw_if_index=self.pg1.sw_if_index,
 832                 prefix_group=self.prefix_group,
 833                 address_with_prefix=address1,
 834                 is_add=False,
 835             )