text: from socket import AF_INET6, inet_ntop, inet_pton
  
  from scapy.layers.dhcp6 import DHCP6_Advertise, DHCP6OptClientId, \
      DHCP6OptStatusCode, DHCP6OptPref, DHCP6OptIA_PD, DHCP6OptIAPrefix, \
      DHCP6OptServerId, DHCP6_Solicit, DHCP6_Reply, DHCP6_Request, DHCP6_Renew, \
      DHCP6_Rebind, DUID_LL, DHCP6_Release, DHCP6OptElapsedTime, DHCP6OptIA_NA, \
      DHCP6OptIAAddress
  from scapy.layers.inet6 import IPv6, Ether, UDP
  from scapy.utils6 import in6_mactoifaceid
  
  from framework import tag_fixme_vpp_workers
  from framework import VppTestCase
  from framework import tag_run_solo
  from vpp_papi import VppEnum
  import util
  import os
  
  
  def ip6_normalize(ip6):
      return inet_ntop(AF_INET6, inet_pton(AF_INET6, ip6))
  
  
  class TestDHCPv6DataPlane(VppTestCase):
      """ DHCPv6 Data Plane Test Case """
  
      @classmethod
      def setUpClass(cls):
          super(TestDHCPv6DataPlane, cls).setUpClass()
  
      @classmethod
      def tearDownClass(cls):
          super(TestDHCPv6DataPlane, cls).tearDownClass()
  
      def setUp(self):
          super(TestDHCPv6DataPlane, self).setUp()
  
          self.create_pg_interfaces(range(1))
          self.interfaces = list(self.pg_interfaces)
          for i in self.interfaces:
              i.admin_up()
              i.config_ip6()
  
          self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
  
      def tearDown(self):
          for i in self.interfaces:
              i.unconfig_ip6()
              i.admin_down()
          super(TestDHCPv6DataPlane, self).tearDown()
  
      def test_dhcp_ia_na_send_solicit_receive_advertise(self):
          """ Verify DHCPv6 IA NA Solicit packet and Advertise event """
  
          self.vapi.dhcp6_clients_enable_disable(enable=1)
  
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
          address = {'address': '1:2:3::5',
                     'preferred_time': 60,
                     'valid_time': 120}
          self.vapi.dhcp6_send_client_message(
              server_index=0xffffffff,
              mrc=1,
              msg_type=VppEnum.vl_api_dhcpv6_msg_type_t.DHCPV6_MSG_API_SOLICIT,
              sw_if_index=self.pg0.sw_if_index,
              T1=20,
              T2=40,
              addresses=[address],
              n_addresses=len(
                  [address]))
          rx_list = self.pg0.get_capture(1)
          self.assertEqual(len(rx_list), 1)
          packet = rx_list[0]
  
          self.assertEqual(packet.haslayer(IPv6), 1)
          self.assertEqual(packet[IPv6].haslayer(DHCP6_Solicit), 1)
  
          client_duid = packet[DHCP6OptClientId].duid
          trid = packet[DHCP6_Solicit].trid
  
          dst = ip6_normalize(packet[IPv6].dst)
          dst2 = ip6_normalize("ff02::1:2")
          self.assert_equal(dst, dst2)
          src = ip6_normalize(packet[IPv6].src)
          src2 = ip6_normalize(self.pg0.local_ip6_ll)
          self.assert_equal(src, src2)
          ia_na = packet[DHCP6OptIA_NA]
          self.assert_equal(ia_na.T1, 20)
          self.assert_equal(ia_na.T2, 40)
          self.assert_equal(len(ia_na.ianaopts), 1)
          address = ia_na.ianaopts[0]
          self.assert_equal(address.addr, '1:2:3::5')
          self.assert_equal(address.preflft, 60)
          self.assert_equal(address.validlft, 120)
  
          self.vapi.want_dhcp6_reply_events(enable_disable=1,
                                            pid=os.getpid())
  
          try:
              ia_na_opts = DHCP6OptIAAddress(addr='7:8::2', preflft=60,
                                             validlft=120)
              p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                   IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                        dst=self.pg0.local_ip6_ll) /
                   UDP(sport=547, dport=546) /
                   DHCP6_Advertise(trid=trid) /
                   DHCP6OptServerId(duid=self.server_duid) /
                   DHCP6OptClientId(duid=client_duid) /
                   DHCP6OptPref(prefval=7) /
                   DHCP6OptStatusCode(statuscode=1) /
                   DHCP6OptIA_NA(iaid=1, T1=20, T2=40, ianaopts=ia_na_opts)
                   )
              self.pg0.add_stream([p])
              self.pg_start()
  
              ev = self.vapi.wait_for_event(1, "dhcp6_reply_event")
  
              self.assert_equal(ev.preference, 7)
              self.assert_equal(ev.status_code, 1)
              self.assert_equal(ev.T1, 20)
              self.assert_equal(ev.T2, 40)
  
              reported_address = ev.addresses[0]
              address = ia_na_opts.getfieldval("addr")
              self.assert_equal(str(reported_address.address), address)
              self.assert_equal(reported_address.preferred_time,
                                ia_na_opts.getfieldval("preflft"))
              self.assert_equal(reported_address.valid_time,
                                ia_na_opts.getfieldval("validlft"))
  
          finally:
              self.vapi.want_dhcp6_reply_events(enable_disable=0)
          self.vapi.dhcp6_clients_enable_disable(enable=0)
  
      def test_dhcp_pd_send_solicit_receive_advertise(self):
          """ Verify DHCPv6 PD Solicit packet and Advertise event """
  
          self.vapi.dhcp6_clients_enable_disable(enable=1)
  
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
  
          prefix = {'prefix': {'address': '1:2:3::', 'len': 50},
                    'preferred_time': 60,
                    'valid_time': 120}
          prefixes = [prefix]
          self.vapi.dhcp6_pd_send_client_message(
              server_index=0xffffffff,
              mrc=1,
              msg_type=VppEnum.vl_api_dhcpv6_msg_type_t.DHCPV6_MSG_API_SOLICIT,
              sw_if_index=self.pg0.sw_if_index,
              T1=20,
              T2=40,
              prefixes=prefixes,
              n_prefixes=len(prefixes))
          rx_list = self.pg0.get_capture(1)
          self.assertEqual(len(rx_list), 1)
          packet = rx_list[0]
  
          self.assertEqual(packet.haslayer(IPv6), 1)
          self.assertEqual(packet[IPv6].haslayer(DHCP6_Solicit), 1)
  
          client_duid = packet[DHCP6OptClientId].duid
          trid = packet[DHCP6_Solicit].trid
  
          dst = ip6_normalize(packet[IPv6].dst)
          dst2 = ip6_normalize("ff02::1:2")
          self.assert_equal(dst, dst2)
          src = ip6_normalize(packet[IPv6].src)
          src2 = ip6_normalize(self.pg0.local_ip6_ll)
          self.assert_equal(src, src2)
          ia_pd = packet[DHCP6OptIA_PD]
          self.assert_equal(ia_pd.T1, 20)
          self.assert_equal(ia_pd.T2, 40)
          self.assert_equal(len(ia_pd.iapdopt), 1)
          prefix = ia_pd.iapdopt[0]
          self.assert_equal(prefix.prefix, '1:2:3::')
          self.assert_equal(prefix.plen, 50)
          self.assert_equal(prefix.preflft, 60)
          self.assert_equal(prefix.validlft, 120)
  
          self.vapi.want_dhcp6_pd_reply_events(enable_disable=1,
                                               pid=os.getpid())
  
          try:
              ia_pd_opts = DHCP6OptIAPrefix(prefix='7:8::', plen=56, preflft=60,
                                            validlft=120)
              p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
                   IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                        dst=self.pg0.local_ip6_ll) /
                   UDP(sport=547, dport=546) /
                   DHCP6_Advertise(trid=trid) /
                   DHCP6OptServerId(duid=self.server_duid) /
                   DHCP6OptClientId(duid=client_duid) /
                   DHCP6OptPref(prefval=7) /
                   DHCP6OptStatusCode(statuscode=1) /
                   DHCP6OptIA_PD(iaid=1, T1=20, T2=40, iapdopt=ia_pd_opts)
                   )
              self.pg0.add_stream([p])
              self.pg_start()
  
              ev = self.vapi.wait_for_event(1, "dhcp6_pd_reply_event")
  
              self.assert_equal(ev.preference, 7)
              self.assert_equal(ev.status_code, 1)
              self.assert_equal(ev.T1, 20)
              self.assert_equal(ev.T2, 40)
  
              reported_prefix = ev.prefixes[0]
              prefix = ia_pd_opts.getfieldval("prefix")
              self.assert_equal(
                  str(reported_prefix.prefix).split('/')[0], prefix)
              self.assert_equal(int(str(reported_prefix.prefix).split('/')[1]),
                                ia_pd_opts.getfieldval("plen"))
              self.assert_equal(reported_prefix.preferred_time,
                                ia_pd_opts.getfieldval("preflft"))
              self.assert_equal(reported_prefix.valid_time,
                                ia_pd_opts.getfieldval("validlft"))
  
          finally:
              self.vapi.want_dhcp6_pd_reply_events(enable_disable=0)
          self.vapi.dhcp6_clients_enable_disable(enable=0)
  
  
  @tag_run_solo
  class TestDHCPv6IANAControlPlane(VppTestCase):
      """ DHCPv6 IA NA Control Plane Test Case """
  
      @classmethod
      def setUpClass(cls):
          super(TestDHCPv6IANAControlPlane, cls).setUpClass()
  
      @classmethod
      def tearDownClass(cls):
          super(TestDHCPv6IANAControlPlane, cls).tearDownClass()
  
      def setUp(self):
          super(TestDHCPv6IANAControlPlane, self).setUp()
  
          self.create_pg_interfaces(range(1))
          self.interfaces = list(self.pg_interfaces)
          for i in self.interfaces:
              i.admin_up()
  
          self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
          self.client_duid = None
          self.T1 = 1
          self.T2 = 2
  
          fib = self.vapi.ip_route_dump(0, True)
          self.initial_addresses = set(self.get_interface_addresses(fib,
                                                                    self.pg0))
  
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
  
          self.vapi.dhcp6_client_enable_disable(sw_if_index=self.pg0.sw_if_index,
                                                enable=1)
  
      def tearDown(self):
          self.vapi.dhcp6_client_enable_disable(sw_if_index=self.pg0.sw_if_index,
                                                enable=0)
  
          for i in self.interfaces:
              i.admin_down()
  
          super(TestDHCPv6IANAControlPlane, self).tearDown()
  
      @staticmethod
      def get_interface_addresses(fib, pg):
          lst = []
          for entry in fib:
              if entry.route.prefix.prefixlen == 128:
                  path = entry.route.paths[0]
                  if path.sw_if_index == pg.sw_if_index:
                      lst.append(str(entry.route.prefix.network_address))
          return lst
  
      def get_addresses(self):
          fib = self.vapi.ip_route_dump(0, True)
          addresses = set(self.get_interface_addresses(fib, self.pg0))
          return addresses.difference(self.initial_addresses)
  
      def validate_duid_ll(self, duid):
          DUID_LL(duid)
  
      def validate_packet(self, packet, msg_type, is_resend=False):
          try:
              self.assertEqual(packet.haslayer(msg_type), 1)
              client_duid = packet[DHCP6OptClientId].duid
              if self.client_duid is None:
                  self.client_duid = client_duid
                  self.validate_duid_ll(client_duid)
              else:
                  self.assertEqual(self.client_duid, client_duid)
              if msg_type != DHCP6_Solicit and msg_type != DHCP6_Rebind:
                  server_duid = packet[DHCP6OptServerId].duid
                  self.assertEqual(server_duid, self.server_duid)
              if is_resend:
                  self.assertEqual(self.trid, packet[msg_type].trid)
              else:
                  self.trid = packet[msg_type].trid
              ip = packet[IPv6]
              udp = packet[UDP]
              self.assertEqual(ip.dst, 'ff02::1:2')
              self.assertEqual(udp.sport, 546)
              self.assertEqual(udp.dport, 547)
              dhcpv6 = packet[msg_type]
              elapsed_time = dhcpv6[DHCP6OptElapsedTime]
              if (is_resend):
                  self.assertNotEqual(elapsed_time.elapsedtime, 0)
              else:
                  self.assertEqual(elapsed_time.elapsedtime, 0)
          except BaseException:
              packet.show()
              raise
  
      def wait_for_packet(self, msg_type, timeout=None, is_resend=False):
          if timeout is None:
              timeout = 3
          rx_list = self.pg0.get_capture(1, timeout=timeout)
          packet = rx_list[0]
          self.validate_packet(packet, msg_type, is_resend=is_resend)
  
      def wait_for_solicit(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Solicit, timeout, is_resend=is_resend)
  
      def wait_for_request(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Request, timeout, is_resend=is_resend)
  
      def wait_for_renew(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Renew, timeout, is_resend=is_resend)
  
      def wait_for_rebind(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Rebind, timeout, is_resend=is_resend)
  
      def wait_for_release(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Release, timeout, is_resend=is_resend)
  
      def send_packet(self, msg_type, t1=None, t2=None, ianaopts=None):
          if t1 is None:
              t1 = self.T1
          if t2 is None:
              t2 = self.T2
          if ianaopts is None:
              opt_ia_na = DHCP6OptIA_NA(iaid=1, T1=t1, T2=t2)
          else:
              opt_ia_na = DHCP6OptIA_NA(iaid=1, T1=t1, T2=t2, ianaopts=ianaopts)
          p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
               IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                    dst=self.pg0.local_ip6_ll) /
               UDP(sport=547, dport=546) /
               msg_type(trid=self.trid) /
               DHCP6OptServerId(duid=self.server_duid) /
               DHCP6OptClientId(duid=self.client_duid) /
               opt_ia_na
               )
          self.pg0.add_stream([p])
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
  
      def send_advertise(self, t1=None, t2=None, ianaopts=None):
          self.send_packet(DHCP6_Advertise, t1, t2, ianaopts)
  
      def send_reply(self, t1=None, t2=None, ianaopts=None):
          self.send_packet(DHCP6_Reply, t1, t2, ianaopts)
  
      def test_T1_and_T2_timeouts(self):
          """ Test T1 and T2 timeouts """
  
          self.wait_for_solicit()
          self.send_advertise()
          self.wait_for_request()
          self.send_reply()
  
          self.sleep(1)
  
          self.wait_for_renew()
  
          self.pg_enable_capture(self.pg_interfaces)
  
          self.sleep(1)
  
          self.wait_for_rebind()
  
      def test_addresses(self):
          """ Test handling of addresses """
  
          ia_na_opts = DHCP6OptIAAddress(addr='7:8::2', preflft=1,
                                         validlft=2)
  
          self.wait_for_solicit()
          self.send_advertise(t1=20, t2=40, ianaopts=ia_na_opts)
          self.wait_for_request()
          self.send_reply(t1=20, t2=40, ianaopts=ia_na_opts)
          self.sleep(0.1)
  
          # check FIB for new address
          new_addresses = self.get_addresses()
          self.assertEqual(len(new_addresses), 1)
          addr = list(new_addresses)[0]
          self.assertEqual(addr, '7:8::2')
  
          self.sleep(2)
  
          # check that the address is deleted
          fib = self.vapi.ip_route_dump(0, True)
          addresses = set(self.get_interface_addresses(fib, self.pg0))
          new_addresses = addresses.difference(self.initial_addresses)
          self.assertEqual(len(new_addresses), 0)
  
      def test_sending_client_messages_solicit(self):
          """ VPP receives messages from DHCPv6 client """
  
          self.wait_for_solicit()
          self.send_packet(DHCP6_Solicit)
          self.send_packet(DHCP6_Request)
          self.send_packet(DHCP6_Renew)
          self.send_packet(DHCP6_Rebind)
          self.sleep(1)
          self.wait_for_solicit(is_resend=True)
  
      def test_sending_inappropriate_packets(self):
          """ Server sends messages with inappropriate message types """
  
          self.wait_for_solicit()
          self.send_reply()
          self.wait_for_solicit(is_resend=True)
          self.send_advertise()
          self.wait_for_request()
          self.send_advertise()
          self.wait_for_request(is_resend=True)
          self.send_reply()
          self.wait_for_renew()
  
      def test_no_address_available_in_advertise(self):
          """ Advertise message contains NoAddrsAvail status code """
  
          self.wait_for_solicit()
          noavail = DHCP6OptStatusCode(statuscode=2)  # NoAddrsAvail
          self.send_advertise(ianaopts=noavail)
          self.wait_for_solicit(is_resend=True)
  
      def test_preferred_greater_than_valid_lifetime(self):
          """ Preferred lifetime is greater than valid lifetime """
  
          self.wait_for_solicit()
          self.send_advertise()
          self.wait_for_request()
          ia_na_opts = DHCP6OptIAAddress(addr='7:8::2', preflft=4, validlft=3)
          self.send_reply(ianaopts=ia_na_opts)
  
          self.sleep(0.5)
  
          # check FIB contains no addresses
          fib = self.vapi.ip_route_dump(0, True)
          addresses = set(self.get_interface_addresses(fib, self.pg0))
          new_addresses = addresses.difference(self.initial_addresses)
          self.assertEqual(len(new_addresses), 0)
  
      def test_T1_greater_than_T2(self):
          """ T1 is greater than T2 """
  
          self.wait_for_solicit()
          self.send_advertise()
          self.wait_for_request()
          ia_na_opts = DHCP6OptIAAddress(addr='7:8::2', preflft=4, validlft=8)
          self.send_reply(t1=80, t2=40, ianaopts=ia_na_opts)
  
          self.sleep(0.5)
  
          # check FIB contains no addresses
          fib = self.vapi.ip_route_dump(0, True)
          addresses = set(self.get_interface_addresses(fib, self.pg0))
          new_addresses = addresses.difference(self.initial_addresses)
          self.assertEqual(len(new_addresses), 0)
  
  
  @tag_fixme_vpp_workers
  class TestDHCPv6PDControlPlane(VppTestCase):
      """ DHCPv6 PD Control Plane Test Case """
  
      @classmethod
      def setUpClass(cls):
          super(TestDHCPv6PDControlPlane, cls).setUpClass()
  
      @classmethod
      def tearDownClass(cls):
          super(TestDHCPv6PDControlPlane, cls).tearDownClass()
  
      def setUp(self):
          super(TestDHCPv6PDControlPlane, self).setUp()
  
          self.create_pg_interfaces(range(2))
          self.interfaces = list(self.pg_interfaces)
          for i in self.interfaces:
              i.admin_up()
  
          self.server_duid = DUID_LL(lladdr=self.pg0.remote_mac)
          self.client_duid = None
          self.T1 = 1
          self.T2 = 2
  
          fib = self.vapi.ip_route_dump(0, True)
          self.initial_addresses = set(self.get_interface_addresses(fib,
                                                                    self.pg1))
  
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
  
          self.prefix_group = 'my-pd-prefix-group'
  
          self.vapi.dhcp6_pd_client_enable_disable(
              enable=1,
              sw_if_index=self.pg0.sw_if_index,
              prefix_group=self.prefix_group)
  
      def tearDown(self):
          self.vapi.dhcp6_pd_client_enable_disable(self.pg0.sw_if_index,
                                                   enable=0)
  
          for i in self.interfaces:
              i.admin_down()
  
          super(TestDHCPv6PDControlPlane, self).tearDown()
  
      @staticmethod
      def get_interface_addresses(fib, pg):
          lst = []
          for entry in fib:
              if entry.route.prefix.prefixlen == 128:
                  path = entry.route.paths[0]
                  if path.sw_if_index == pg.sw_if_index:
                      lst.append(str(entry.route.prefix.network_address))
          return lst
  
      def get_addresses(self):
          fib = self.vapi.ip_route_dump(0, True)
          addresses = set(self.get_interface_addresses(fib, self.pg1))
          return addresses.difference(self.initial_addresses)
  
      def validate_duid_ll(self, duid):
          DUID_LL(duid)
  
      def validate_packet(self, packet, msg_type, is_resend=False):
          try:
              self.assertEqual(packet.haslayer(msg_type), 1)
              client_duid = packet[DHCP6OptClientId].duid
              if self.client_duid is None:
                  self.client_duid = client_duid
                  self.validate_duid_ll(client_duid)
              else:
                  self.assertEqual(self.client_duid, client_duid)
              if msg_type != DHCP6_Solicit and msg_type != DHCP6_Rebind:
                  server_duid = packet[DHCP6OptServerId].duid
                  self.assertEqual(server_duid, self.server_duid)
              if is_resend:
                  self.assertEqual(self.trid, packet[msg_type].trid)
              else:
                  self.trid = packet[msg_type].trid
              ip = packet[IPv6]
              udp = packet[UDP]
              self.assertEqual(ip.dst, 'ff02::1:2')
              self.assertEqual(udp.sport, 546)
              self.assertEqual(udp.dport, 547)
              dhcpv6 = packet[msg_type]
              elapsed_time = dhcpv6[DHCP6OptElapsedTime]
              if (is_resend):
                  self.assertNotEqual(elapsed_time.elapsedtime, 0)
              else:
                  self.assertEqual(elapsed_time.elapsedtime, 0)
          except BaseException:
              packet.show()
              raise
  
      def wait_for_packet(self, msg_type, timeout=None, is_resend=False):
          if timeout is None:
              timeout = 3
          rx_list = self.pg0.get_capture(1, timeout=timeout)
          packet = rx_list[0]
          self.validate_packet(packet, msg_type, is_resend=is_resend)
  
      def wait_for_solicit(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Solicit, timeout, is_resend=is_resend)
  
      def wait_for_request(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Request, timeout, is_resend=is_resend)
  
      def wait_for_renew(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Renew, timeout, is_resend=is_resend)
  
      def wait_for_rebind(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Rebind, timeout, is_resend=is_resend)
  
      def wait_for_release(self, timeout=None, is_resend=False):
          self.wait_for_packet(DHCP6_Release, timeout, is_resend=is_resend)
  
      def send_packet(self, msg_type, t1=None, t2=None, iapdopt=None):
          if t1 is None:
              t1 = self.T1
          if t2 is None:
              t2 = self.T2
          if iapdopt is None:
              opt_ia_pd = DHCP6OptIA_PD(iaid=1, T1=t1, T2=t2)
          else:
              opt_ia_pd = DHCP6OptIA_PD(iaid=1, T1=t1, T2=t2, iapdopt=iapdopt)
          p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
               IPv6(src=util.mk_ll_addr(self.pg0.remote_mac),
                    dst=self.pg0.local_ip6_ll) /
               UDP(sport=547, dport=546) /
               msg_type(trid=self.trid) /
               DHCP6OptServerId(duid=self.server_duid) /
               DHCP6OptClientId(duid=self.client_duid) /
               opt_ia_pd
               )
          self.pg0.add_stream([p])
          self.pg_enable_capture(self.pg_interfaces)
          self.pg_start()
  
      def send_advertise(self, t1=None, t2=None, iapdopt=None):
          self.send_packet(DHCP6_Advertise, t1, t2, iapdopt)
  
      def send_reply(self, t1=None, t2=None, iapdopt=None):
          self.send_packet(DHCP6_Reply, t1, t2, iapdopt)
  
      def test_T1_and_T2_timeouts(self):
          """ Test T1 and T2 timeouts """
  
          self.wait_for_solicit()
          self.send_advertise()
          self.wait_for_request()
          self.send_reply()
  
          self.sleep(1)
  
          self.wait_for_renew()
  
          self.pg_enable_capture(self.pg_interfaces)
  
          self.sleep(1)
  
          self.wait_for_rebind()
  
      def test_prefixes(self):
          """ Test handling of prefixes """
  
          address1 = '::2:0:0:0:405/60'
          address2 = '::76:0:0:0:406/62'
          try:
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  address_with_prefix=address1,
                  prefix_group=self.prefix_group)
  
              ia_pd_opts = DHCP6OptIAPrefix(prefix='7:8::', plen=56, preflft=2,
                                            validlft=3)
  
              self.wait_for_solicit()
              self.send_advertise(t1=20, t2=40, iapdopt=ia_pd_opts)
              self.wait_for_request()
              self.send_reply(t1=20, t2=40, iapdopt=ia_pd_opts)
              self.sleep(0.1)
  
              # check FIB for new address
              new_addresses = self.get_addresses()
              self.assertEqual(len(new_addresses), 1)
              addr = list(new_addresses)[0]
              self.assertEqual(addr, '7:8:0:2::405')
  
              self.sleep(1)
  
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  address_with_prefix=address2,
                  prefix_group=self.prefix_group)
  
              self.sleep(1)
  
              # check FIB contains 2 addresses
              fib = self.vapi.ip_route_dump(0, True)
              addresses = set(self.get_interface_addresses(fib, self.pg1))
              new_addresses = addresses.difference(self.initial_addresses)
              self.assertEqual(len(new_addresses), 2)
              addr1 = list(new_addresses)[0]
              addr2 = list(new_addresses)[1]
              if addr1 == '7:8:0:76::406':
                  addr1, addr2 = addr2, addr1
              self.assertEqual(addr1, '7:8:0:2::405')
              self.assertEqual(addr2, '7:8:0:76::406')
  
              self.sleep(1)
  
              # check that the addresses are deleted
              fib = self.vapi.ip_route_dump(0, True)
              addresses = set(self.get_interface_addresses(fib, self.pg1))
              new_addresses = addresses.difference(self.initial_addresses)
              self.assertEqual(len(new_addresses), 0)
  
          finally:
              if address1 is not None:
                  self.vapi.ip6_add_del_address_using_prefix(
                      sw_if_index=self.pg1.sw_if_index,
                      address_with_prefix=address1,
                      prefix_group=self.prefix_group, is_add=0)
              if address2 is not None:
                  self.vapi.ip6_add_del_address_using_prefix(
                      sw_if_index=self.pg1.sw_if_index,
                      address_with_prefix=address2,
                      prefix_group=self.prefix_group, is_add=0)
  
      def test_sending_client_messages_solicit(self):
          """ VPP receives messages from DHCPv6 client """
  
          self.wait_for_solicit()
          self.send_packet(DHCP6_Solicit)
          self.send_packet(DHCP6_Request)
          self.send_packet(DHCP6_Renew)
          self.send_packet(DHCP6_Rebind)
          self.sleep(1)
          self.wait_for_solicit(is_resend=True)
  
      def test_sending_inappropriate_packets(self):
          """ Server sends messages with inappropriate message types """
  
          self.wait_for_solicit()
          self.send_reply()
          self.wait_for_solicit(is_resend=True)
          self.send_advertise()
          self.wait_for_request()
          self.send_advertise()
          self.wait_for_request(is_resend=True)
          self.send_reply()
          self.wait_for_renew()
  
      def test_no_prefix_available_in_advertise(self):
          """ Advertise message contains NoPrefixAvail status code """
  
          self.wait_for_solicit()
          noavail = DHCP6OptStatusCode(statuscode=6)  # NoPrefixAvail
          self.send_advertise(iapdopt=noavail)
          self.wait_for_solicit(is_resend=True)
  
      def test_preferred_greater_than_valid_lifetime(self):
          """ Preferred lifetime is greater than valid lifetime """
  
          address1 = '::2:0:0:0:405/60'
          try:
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  address_with_prefix=address1,
                  prefix_group=self.prefix_group)
  
              self.wait_for_solicit()
              self.send_advertise()
              self.wait_for_request()
              ia_pd_opts = DHCP6OptIAPrefix(prefix='7:8::', plen=56, preflft=4,
                                            validlft=3)
              self.send_reply(iapdopt=ia_pd_opts)
  
              self.sleep(0.5)
  
              # check FIB contains no addresses
              fib = self.vapi.ip_route_dump(0, True)
              addresses = set(self.get_interface_addresses(fib, self.pg1))
              new_addresses = addresses.difference(self.initial_addresses)
              self.assertEqual(len(new_addresses), 0)
  
          finally:
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  address_with_prefix=address1,
                  prefix_group=self.prefix_group,
                  is_add=0)
  
      def test_T1_greater_than_T2(self):
          """ T1 is greater than T2 """
  
          address1 = '::2:0:0:0:405/60'
          try:
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  address_with_prefix=address1,
                  prefix_group=self.prefix_group)
  
              self.wait_for_solicit()
              self.send_advertise()
              self.wait_for_request()
              ia_pd_opts = DHCP6OptIAPrefix(prefix='7:8::', plen=56, preflft=4,
                                            validlft=8)
              self.send_reply(t1=80, t2=40, iapdopt=ia_pd_opts)
  
              self.sleep(0.5)
  
              # check FIB contains no addresses
              fib = self.vapi.ip_route_dump(0, True)
              addresses = set(self.get_interface_addresses(fib, self.pg1))
              new_addresses = addresses.difference(self.initial_addresses)
              self.assertEqual(len(new_addresses), 0)
  
          finally:
              self.vapi.ip6_add_del_address_using_prefix(
                  sw_if_index=self.pg1.sw_if_index,
                  prefix_group=self.prefix_group,
                  address_with_prefix=address1,
                  is_add=False)
  