DHCPv[46] proxy tests

Change-Id: I6aaf9c602cd515ed9d4416d286f9191d048c1a87
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 739 insertions, 0 deletions

diff --git a/test/test_dhcp.py b/test/test_dhcp.py
new file mode 100644
index 00000000000..bdff679c6b2
--- /dev/null
+++ b/test/test_dhcp.py
@@ -0,0 +1,739 @@
+#!/usr/bin/env python
+
+import unittest
+import socket
+
+from framework import VppTestCase, VppTestRunner
+from vpp_ip_route import IpRoute, RoutePath
+from vpp_lo_interface import VppLoInterface
+
+from scapy.layers.l2 import Ether, getmacbyip
+from scapy.layers.inet import IP, UDP, ICMP
+from scapy.layers.inet6 import IPv6, in6_getnsmac, in6_mactoifaceid
+from scapy.layers.dhcp import DHCP, BOOTP, DHCPTypes
+from scapy.layers.dhcp6 import DHCP6, DHCP6_Solicit, DHCP6_RelayForward, \
+    DHCP6_RelayReply, DHCP6_Advertise, DHCP6OptRelayMsg, DHCP6OptIfaceId, \
+    DHCP6OptStatusCode, DHCP6OptVSS, DHCP6OptClientLinkLayerAddr
+from socket import AF_INET, AF_INET6
+from scapy.utils import inet_pton, inet_ntop
+from scapy.utils6 import in6_ptop
+
+DHCP4_CLIENT_PORT = 68
+DHCP4_SERVER_PORT = 67
+DHCP6_CLIENT_PORT = 547
+DHCP6_SERVER_PORT = 546
+
+
+def mk_ll_addr(mac):
+
+    euid = in6_mactoifaceid(mac)
+    addr = "fe80::" + euid
+    return addr
+
+
+class TestDHCP(VppTestCase):
+    """ DHCP Test Case """
+
+    def setUp(self):
+        super(TestDHCP, self).setUp()
+
+        # create 3 pg interfaces
+        self.create_pg_interfaces(range(4))
+
+        # pg0 and 1 are IP configured in VRF 0 and 1.
+        # pg2 and 3 are non IP-configured in VRF 0 and 1
+        table_id = 0
+        for i in self.pg_interfaces[:2]:
+            i.admin_up()
+            i.set_table_ip4(table_id)
+            i.set_table_ip6(table_id)
+            i.config_ip4()
+            i.resolve_arp()
+            i.config_ip6()
+            i.resolve_ndp()
+            table_id += 1
+
+        table_id = 0
+        for i in self.pg_interfaces[2:]:
+            i.admin_up()
+            i.set_table_ip4(table_id)
+            i.set_table_ip6(table_id)
+            table_id += 1
+
+    def send_and_assert_no_replies(self, intf, pkts, remark):
+        intf.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        for i in self.pg_interfaces:
+            i.assert_nothing_captured(remark=remark)
+
+    def validate_option_82(self, pkt, intf, ip_addr):
+        dhcp = pkt[DHCP]
+        found = 0
+        data = []
+
+        for i in dhcp.options:
+            if type(i) is tuple:
+                if i[0] == "relay_agent_Information":
+                    #
+                    # There are two sb-options present - each of length 6.
+                    #
+                    data = i[1]
+                    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])
+
+                    found = 1
+        self.assertTrue(found)
+
+        return data
+
+    def verify_dhcp_offer(self, pkt, intf, check_option_82=True):
+        ether = pkt[Ether]
+        self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff")
+        self.assertEqual(ether.src, intf.local_mac)
+
+        ip = pkt[IP]
+        self.assertEqual(ip.dst, "255.255.255.255")
+        self.assertEqual(ip.src, intf.local_ip4)
+
+        udp = pkt[UDP]
+        self.assertEqual(udp.dport, DHCP4_CLIENT_PORT)
+        self.assertEqual(udp.sport, DHCP4_SERVER_PORT)
+
+        dhcp = pkt[DHCP]
+        is_offer = False
+        for o in dhcp.options:
+            if type(o) is tuple:
+                if o[0] == "message-type" \
+                   and DHCPTypes[o[1]] == "offer":
+                    is_offer = True
+        self.assertTrue(is_offer)
+
+        if check_option_82:
+            data = self.validate_option_82(pkt, intf, intf.local_ip4)
+
+    def verify_dhcp_discover(self, pkt, intf, src_intf=None,
+                             option_82_present=True):
+        ether = pkt[Ether]
+        self.assertEqual(ether.dst, intf.remote_mac)
+        self.assertEqual(ether.src, intf.local_mac)
+
+        ip = pkt[IP]
+        self.assertEqual(ip.dst, intf.remote_ip4)
+        self.assertEqual(ip.src, intf.local_ip4)
+
+        udp = pkt[UDP]
+        self.assertEqual(udp.dport, DHCP4_SERVER_PORT)
+        self.assertEqual(udp.sport, DHCP4_CLIENT_PORT)
+
+        dhcp = pkt[DHCP]
+
+        is_discover = False
+        for o in dhcp.options:
+            if type(o) is tuple:
+                if o[0] == "message-type" \
+                   and DHCPTypes[o[1]] == "discover":
+                    is_discover = True
+        self.assertTrue(is_discover)
+
+        if option_82_present:
+            data = self.validate_option_82(pkt, src_intf, src_intf.local_ip4)
+            return data
+        else:
+            for i in dhcp.options:
+                if type(i) is tuple:
+                    self.assertNotEqual(i[0], "relay_agent_Information")
+
+    def verify_dhcp6_solicit(self, pkt, intf,
+                             peer_ip, peer_mac,
+                             fib_id=0,
+                             oui=0):
+        ether = pkt[Ether]
+        self.assertEqual(ether.dst, intf.remote_mac)
+        self.assertEqual(ether.src, intf.local_mac)
+
+        ip = pkt[IPv6]
+        self.assertEqual(in6_ptop(ip.dst), in6_ptop(intf.remote_ip6))
+        self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6))
+
+        udp = pkt[UDP]
+        self.assertEqual(udp.dport, DHCP6_CLIENT_PORT)
+        self.assertEqual(udp.sport, DHCP6_SERVER_PORT)
+
+        relay = pkt[DHCP6_RelayForward]
+        self.assertEqual(in6_ptop(relay.peeraddr), in6_ptop(peer_ip))
+        oid = pkt[DHCP6OptIfaceId]
+        cll = pkt[DHCP6OptClientLinkLayerAddr]
+        self.assertEqual(cll.optlen, 8)
+        self.assertEqual(cll.lltype, 1)
+        self.assertEqual(cll.clladdr, peer_mac)
+
+        vss = pkt[DHCP6OptVSS]
+        self.assertEqual(vss.optlen, 8)
+        self.assertEqual(vss.type, 1)
+        # the OUI and FIB-id are really 3 and 4 bytes resp.
+        # but the tested range is small
+        self.assertEqual(ord(vss.data[0]), 0)
+        self.assertEqual(ord(vss.data[1]), 0)
+        self.assertEqual(ord(vss.data[2]), oui)
+        self.assertEqual(ord(vss.data[3]), 0)
+        self.assertEqual(ord(vss.data[4]), 0)
+        self.assertEqual(ord(vss.data[5]), 0)
+        self.assertEqual(ord(vss.data[6]), fib_id)
+
+        # the relay message should be an encoded Solicit
+        msg = pkt[DHCP6OptRelayMsg]
+        sol = DHCP6_Solicit()
+        self.assertEqual(msg.optlen, len(str(sol)))
+        self.assertEqual(str(sol), (str(msg[1]))[:msg.optlen])
+
+    def verify_dhcp6_advert(self, pkt, intf, peer):
+        ether = pkt[Ether]
+        self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff")
+        self.assertEqual(ether.src, intf.local_mac)
+
+        ip = pkt[IPv6]
+        self.assertEqual(in6_ptop(ip.dst), in6_ptop(peer))
+        self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6))
+
+        udp = pkt[UDP]
+        self.assertEqual(udp.dport, DHCP6_SERVER_PORT)
+        self.assertEqual(udp.sport, DHCP6_CLIENT_PORT)
+
+        # not sure why this is not decoding
+        # adv = pkt[DHCP6_Advertise]
+
+    def test_dhcp_proxy(self):
+        """ DHCPv4 Proxy """
+
+        #
+        # Verify no response to DHCP request without DHCP config
+        #
+        p_disc_vrf0 = (Ether(dst="ff:ff:ff:ff:ff:ff",
+                             src=self.pg2.remote_mac) /
+                       IP(src="0.0.0.0", dst="255.255.255.255") /
+                       UDP(sport=DHCP4_CLIENT_PORT,
+                           dport=DHCP4_SERVER_PORT) /
+                       BOOTP(op=1) /
+                       DHCP(options=[('message-type', 'discover'), ('end')]))
+        pkts_disc_vrf0 = [p_disc_vrf0]
+        p_disc_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff",
+                             src=self.pg3.remote_mac) /
+                       IP(src="0.0.0.0", dst="255.255.255.255") /
+                       UDP(sport=DHCP4_CLIENT_PORT,
+                           dport=DHCP4_SERVER_PORT) /
+                       BOOTP(op=1) /
+                       DHCP(options=[('message-type', 'discover'), ('end')]))
+        pkts_disc_vrf1 = [p_disc_vrf0]
+
+        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
+                                        "DHCP with no configuration")
+        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
+                                        "DHCP with no configuration")
+
+        #
+        # Enable DHCP proxy in VRF 0
+        #
+        server_addr = self.pg0.remote_ip4n
+        src_addr = self.pg0.local_ip4n
+
+        self.vapi.dhcp_proxy_config(server_addr,
+                                    src_addr,
+                                    rx_table_id=0)
+
+        #
+        # Now a DHCP request on pg2, which is in the same VRF
+        # as the DHCP config, will result in a relayed DHCP
+        # message to the [fake] server
+        #
+        self.pg2.add_stream(pkts_disc_vrf0)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg0.get_capture(1)
+        rx = rx[0]
+
+        #
+        # 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.verify_dhcp_discover(rx, self.pg0, option_82_present=False)
+
+        #
+        # Inject a response from the server
+        #  VPP will only relay the offer if option 82 is present.
+        #  so this one is dropped
+        #
+        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.pg0, pkts,
+                                        "DHCP offer no option 82")
+
+        #
+        # Configure sending option 82 in relayed messages
+        #
+        self.vapi.dhcp_proxy_config(server_addr,
+                                    src_addr,
+                                    rx_table_id=0,
+                                    insert_circuit_id=1)
+
+        #
+        # Send a request:
+        #  again dropped, but ths time because there is no IP addrees on the
+        #  clinet interfce to fill in the option.
+        #
+        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
+                                        "DHCP no relay address")
+
+        #
+        # configure an IP address on the client facing interface
+        #
+        self.pg2.config_ip4()
+
+        #
+        # Try again with a discover packet
+        # Rx'd packet should be to the server address and from the configured
+        # source address
+        # UDP source ports are unchanged
+        # we've no option 82 config so that should be absent
+        #
+        self.pg2.add_stream(pkts_disc_vrf0)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg0.get_capture(1)
+        rx = rx[0]
+
+        option_82 = self.verify_dhcp_discover(rx, self.pg0, src_intf=self.pg2)
+
+        #
+        # Create an DHCP offer reply from the server with a correctly formatted
+        # option 82. i.e. send back what we just captured
+        # The offer, sent mcast to the client, still has option 82.
+        #
+        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
+             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
+             BOOTP(op=1) /
+             DHCP(options=[('message-type', 'offer'),
+                           ('relay_agent_Information', option_82),
+                           ('end')]))
+        pkts = [p]
+
+        self.pg0.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg2.get_capture(1)
+        rx = rx[0]
+
+        self.verify_dhcp_offer(rx, self.pg2)
+
+        #
+        # Bogus Option 82:
+        #
+        # 1. not our IP address = not checked by VPP? so offer is replayed
+        #    to client
+        bad_ip = option_82[0:8] + chr(33) + option_82[9:]
+
+        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
+             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
+             BOOTP(op=1) /
+             DHCP(options=[('message-type', 'offer'),
+                           ('relay_agent_Information', bad_ip),
+                           ('end')]))
+        pkts = [p]
+
+        self.pg0.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        rx = self.pg2.get_capture(1)
+        rx = rx[0]
+
+        self.verify_dhcp_offer(rx, self.pg2, check_option_82=False)
+        self.pg0.assert_nothing_captured(remark="")
+
+        # 2. Not a sw_if_index VPP knows
+        bad_if_index = option_82[0:2] + chr(33) + option_82[3:]
+
+        p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+             IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
+             UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
+             BOOTP(op=1) /
+             DHCP(options=[('message-type', 'offer'),
+                           ('relay_agent_Information', bad_if_index),
+                           ('end')]))
+        pkts = [p]
+        self.send_and_assert_no_replies(self.pg0, pkts,
+                                        "DHCP offer option 82 bad if index")
+
+        #
+        # Send a DHCP request in VRF 1. should be dropped.
+        #
+        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
+                                        "DHCP with no configuration VRF 1")
+
+        #
+        # Delete the DHCP config in VRF 0
+        # Should now drop requests.
+        #
+        self.vapi.dhcp_proxy_config(server_addr,
+                                    src_addr,
+                                    rx_table_id=0,
+                                    is_add=0,
+                                    insert_circuit_id=1)
+
+        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
+                                        "DHCP config removed VRF 0")
+        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
+                                        "DHCP config removed VRF 1")
+
+        #
+        # Add DHCP config for VRF 1
+        #
+        server_addr = self.pg1.remote_ip4n
+        src_addr = self.pg1.local_ip4n
+        self.vapi.dhcp_proxy_config(server_addr,
+                                    src_addr,
+                                    rx_table_id=1,
+                                    server_table_id=1,
+                                    insert_circuit_id=1)
+
+        #
+        # Confim DHCP requests ok in VRF 1.
+        #  - dropped on IP config on client interface
+        #
+        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
+                                        "DHCP config removed VRF 1")
+
+        #
+        # configure an IP address on the client facing interface
+        #
+        self.pg3.config_ip4()
+
+        self.pg3.add_stream(pkts_disc_vrf1)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg1.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3)
+
+        #
+        # remove DHCP config to cleanup
+        #
+        self.vapi.dhcp_proxy_config(server_addr,
+                                    src_addr,
+                                    rx_table_id=1,
+                                    server_table_id=1,
+                                    insert_circuit_id=1,
+                                    is_add=0)
+
+        self.send_and_assert_no_replies(self.pg2, pkts_disc_vrf0,
+                                        "DHCP cleanup VRF 0")
+        self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
+                                        "DHCP cleanup VRF 1")
+
+    def test_dhcp6_proxy(self):
+        """ DHCPv6 Proxy"""
+        #
+        # Verify no response to DHCP request without DHCP config
+        #
+        dhcp_solicit_dst = "ff02::1:2"
+        dhcp_solicit_src_vrf0 = mk_ll_addr(self.pg2.remote_mac)
+        dhcp_solicit_src_vrf1 = mk_ll_addr(self.pg3.remote_mac)
+        server_addr_vrf0 = self.pg0.remote_ip6n
+        src_addr_vrf0 = self.pg0.local_ip6n
+        server_addr_vrf1 = self.pg1.remote_ip6n
+        src_addr_vrf1 = self.pg1.local_ip6n
+
+        #
+        # Add the Route to receive the DHCP packets
+        #
+        route_dhcp_vrf0 = IpRoute(self, dhcp_solicit_dst, 128,
+                                  [], is_local=1, is_ip6=1)
+        route_dhcp_vrf0.add_vpp_config()
+        route_dhcp_vrf1 = IpRoute(self, dhcp_solicit_dst, 128,
+                                  [], is_local=1, is_ip6=1,
+                                  table_id=1)
+        route_dhcp_vrf1.add_vpp_config()
+
+        dmac = in6_getnsmac(inet_pton(socket.AF_INET6, dhcp_solicit_dst))
+        p_solicit_vrf0 = (Ether(dst=dmac, src=self.pg2.remote_mac) /
+                          IPv6(src=dhcp_solicit_src_vrf0,
+                               dst=dhcp_solicit_dst) /
+                          UDP(sport=DHCP6_SERVER_PORT,
+                              dport=DHCP6_CLIENT_PORT) /
+                          DHCP6_Solicit())
+        pkts_solicit_vrf0 = [p_solicit_vrf0]
+        p_solicit_vrf1 = (Ether(dst=dmac, src=self.pg3.remote_mac) /
+                          IPv6(src=dhcp_solicit_src_vrf1,
+                               dst=dhcp_solicit_dst) /
+                          UDP(sport=DHCP6_SERVER_PORT,
+                              dport=DHCP6_CLIENT_PORT) /
+                          DHCP6_Solicit())
+        pkts_solicit_vrf1 = [p_solicit_vrf1]
+
+        self.send_and_assert_no_replies(self.pg2, pkts_solicit_vrf0,
+                                        "DHCP with no configuration")
+        self.send_and_assert_no_replies(self.pg3, pkts_solicit_vrf1,
+                                        "DHCP with no configuration")
+
+        #
+        # DHCPv6 config in VRF 0.
+        # Packets still dropped because the client facing interface has no
+        # IPv6 config
+        #
+        self.vapi.dhcp_proxy_config(server_addr_vrf0,
+                                    src_addr_vrf0,
+                                    rx_table_id=0,
+                                    server_table_id=0,
+                                    insert_circuit_id=1,
+                                    is_ipv6=1)
+
+        self.send_and_assert_no_replies(self.pg2, pkts_solicit_vrf0,
+                                        "DHCP with no configuration")
+        self.send_and_assert_no_replies(self.pg3, pkts_solicit_vrf1,
+                                        "DHCP with no configuration")
+
+        #
+        # configure an IP address on the client facing interface
+        #
+        self.pg2.config_ip6()
+
+        #
+        # Now the DHCP requests are relayed to the server
+        #
+        self.pg2.add_stream(pkts_solicit_vrf0)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg0.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_solicit(rx, self.pg0,
+                                  dhcp_solicit_src_vrf0,
+                                  self.pg2.remote_mac)
+
+        #
+        # Exception cases for rejected relay responses
+        #
+
+        # 1 - not a relay reply
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_Advertise())
+        pkts_adv_vrf0 = [p_adv_vrf0]
+        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
+                                        "DHCP6 not a relay reply")
+
+        # 2 - no relay message option
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply() /
+                      DHCP6_Advertise())
+        pkts_adv_vrf0 = [p_adv_vrf0]
+        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
+                                        "DHCP not a relay message")
+
+        # 3 - no circuit ID
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply() /
+                      DHCP6OptRelayMsg(optlen=0) /
+                      DHCP6_Advertise())
+        pkts_adv_vrf0 = [p_adv_vrf0]
+        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
+                                        "DHCP6 no circuit ID")
+        # 4 - wrong circuit ID
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply() /
+                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') /
+                      DHCP6OptRelayMsg(optlen=0) /
+                      DHCP6_Advertise())
+        pkts_adv_vrf0 = [p_adv_vrf0]
+        self.send_and_assert_no_replies(self.pg2, pkts_adv_vrf0,
+                                        "DHCP6 wrong circuit ID")
+
+        #
+        # Send the relay response (the advertisement)
+        #   - no peer address
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply() /
+                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x03') /
+                      DHCP6OptRelayMsg(optlen=0) /
+                      DHCP6_Advertise(trid=1) /
+                      DHCP6OptStatusCode(statuscode=0))
+        pkts_adv_vrf0 = [p_adv_vrf0]
+
+        self.pg0.add_stream(pkts_adv_vrf0)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg2.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_advert(rx, self.pg2, "::")
+
+        #
+        # Send the relay response (the advertisement)
+        #   - with peer address
+        p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+                      IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf0) /
+                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x03') /
+                      DHCP6OptRelayMsg(optlen=0) /
+                      DHCP6_Advertise(trid=1) /
+                      DHCP6OptStatusCode(statuscode=0))
+        pkts_adv_vrf0 = [p_adv_vrf0]
+
+        self.pg0.add_stream(pkts_adv_vrf0)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg2.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_advert(rx, self.pg2, dhcp_solicit_src_vrf0)
+
+        #
+        # Add all the config for VRF 1
+        #
+        self.vapi.dhcp_proxy_config(server_addr_vrf1,
+                                    src_addr_vrf1,
+                                    rx_table_id=1,
+                                    server_table_id=1,
+                                    insert_circuit_id=1,
+                                    is_ipv6=1)
+        self.pg3.config_ip6()
+
+        #
+        # VRF 1 solicit
+        #
+        self.pg3.add_stream(pkts_solicit_vrf1)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg1.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_solicit(rx, self.pg1,
+                                  dhcp_solicit_src_vrf1,
+                                  self.pg3.remote_mac)
+
+        #
+        # VRF 1 Advert
+        #
+        p_adv_vrf1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
+                      IPv6(dst=self.pg1.local_ip6, src=self.pg1.remote_ip6) /
+                      UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) /
+                      DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) /
+                      DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x04') /
+                      DHCP6OptRelayMsg(optlen=0) /
+                      DHCP6_Advertise(trid=1) /
+                      DHCP6OptStatusCode(statuscode=0))
+        pkts_adv_vrf1 = [p_adv_vrf1]
+
+        self.pg1.add_stream(pkts_adv_vrf1)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg3.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_advert(rx, self.pg3, dhcp_solicit_src_vrf1)
+
+        #
+        # Add VSS config
+        #  table=1, fib=id=1, oui=4
+        self.vapi.dhcp_proxy_set_vss(1, 1, 4, is_ip6=1)
+
+        self.pg3.add_stream(pkts_solicit_vrf1)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg1.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_solicit(rx, self.pg1,
+                                  dhcp_solicit_src_vrf1,
+                                  self.pg3.remote_mac,
+                                  fib_id=1,
+                                  oui=4)
+
+        #
+        # Remove the VSS config
+        #  relayed DHCP has default vlaues in the option.
+        #
+        self.vapi.dhcp_proxy_set_vss(1, 1, 4, is_ip6=1, is_add=0)
+
+        self.pg3.add_stream(pkts_solicit_vrf1)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        rx = self.pg1.get_capture(1)
+        rx = rx[0]
+        self.verify_dhcp6_solicit(rx, self.pg1,
+                                  dhcp_solicit_src_vrf1,
+                                  self.pg3.remote_mac)
+
+        #
+        # Cleanup
+        #
+        self.vapi.dhcp_proxy_config(server_addr_vrf1,
+                                    src_addr_vrf1,
+                                    rx_table_id=1,
+                                    server_table_id=1,
+                                    insert_circuit_id=1,
+                                    is_ipv6=1,
+                                    is_add=0)
+        self.vapi.dhcp_proxy_config(server_addr_vrf1,
+                                    src_addr_vrf1,
+                                    rx_table_id=0,
+                                    server_table_id=0,
+                                    insert_circuit_id=1,
+                                    is_ipv6=1,
+                                    is_add=0)
+
+        route_dhcp_vrf0.remove_vpp_config()
+        route_dhcp_vrf1.remove_vpp_config()
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)