diff options
Diffstat (limited to 'src/plugins/dhcp/test/test_dhcp.py')
| -rw-r--r-- | src/plugins/dhcp/test/test_dhcp.py | 1653 |
1 files changed, 1653 insertions, 0 deletions
diff --git a/src/plugins/dhcp/test/test_dhcp.py b/src/plugins/dhcp/test/test_dhcp.py new file mode 100644 index 00000000000..2200e489d00 --- /dev/null +++ b/src/plugins/dhcp/test/test_dhcp.py @@ -0,0 +1,1653 @@ +#!/usr/bin/env python + +import unittest +import socket +import struct + +from framework import VppTestCase, VppTestRunner, running_extended_tests +from vpp_neighbor import VppNeighbor +from vpp_ip_route import find_route, VppIpTable +from util import mk_ll_addr +import scapy.compat +from scapy.layers.l2 import Ether, getmacbyip, ARP, Dot1Q +from scapy.layers.inet import IP, UDP, ICMP +from scapy.layers.inet6 import IPv6, in6_getnsmac +from scapy.utils6 import in6_mactoifaceid +from scapy.layers.dhcp import DHCP, BOOTP, DHCPTypes +from scapy.layers.dhcp6 import DHCP6, DHCP6_Solicit, DHCP6_RelayForward, \ + DHCP6_RelayReply, DHCP6_Advertise, DHCP6OptRelayMsg, DHCP6OptIfaceId, \ + DHCP6OptStatusCode, DHCP6OptVSS, DHCP6OptClientLinkLayerAddr, DHCP6_Request +from socket import AF_INET, AF_INET6 +from scapy.utils import inet_pton, inet_ntop +from scapy.utils6 import in6_ptop +from vpp_papi import mac_pton, VppEnum +from vpp_sub_interface import VppDot1QSubint +from vpp_qos import VppQosEgressMap, VppQosMark +from vpp_dhcp import VppDHCPClient, VppDHCPProxy + + +DHCP4_CLIENT_PORT = 68 +DHCP4_SERVER_PORT = 67 +DHCP6_CLIENT_PORT = 547 +DHCP6_SERVER_PORT = 546 + + +class TestDHCP(VppTestCase): + """ DHCP Test Case """ + + @classmethod + def setUpClass(cls): + super(TestDHCP, cls).setUpClass() + + @classmethod + def tearDownClass(cls): + super(TestDHCP, cls).tearDownClass() + + def setUp(self): + super(TestDHCP, self).setUp() + + # create 6 pg interfaces for pg0 to pg5 + self.create_pg_interfaces(range(6)) + self.tables = [] + + # pg0 to 2 are IP configured in VRF 0, 1 and 2. + # pg3 to 5 are non IP-configured in VRF 0, 1 and 2. + table_id = 0 + for table_id in range(1, 4): + tbl4 = VppIpTable(self, table_id) + tbl4.add_vpp_config() + self.tables.append(tbl4) + tbl6 = VppIpTable(self, table_id, is_ip6=1) + tbl6.add_vpp_config() + self.tables.append(tbl6) + + table_id = 0 + for i in self.pg_interfaces[:3]: + i.admin_up() + i.set_table_ip4(table_id) + i.set_table_ip6(table_id) + i.config_ip4() + i.resolve_arp() + i.config_ip6() + i.resolve_ndp() + table_id += 1 + + table_id = 0 + for i in self.pg_interfaces[3:]: + i.admin_up() + i.set_table_ip4(table_id) + i.set_table_ip6(table_id) + table_id += 1 + + def tearDown(self): + for i in self.pg_interfaces[:3]: + i.unconfig_ip4() + i.unconfig_ip6() + + for i in self.pg_interfaces: + i.set_table_ip4(0) + i.set_table_ip6(0) + i.admin_down() + super(TestDHCP, self).tearDown() + + def verify_dhcp_has_option(self, pkt, option, value): + dhcp = pkt[DHCP] + found = False + + for i in dhcp.options: + if isinstance(i, tuple): + if i[0] == option: + self.assertEqual(i[1], value) + found = True + + self.assertTrue(found) + + def validate_relay_options(self, pkt, intf, ip_addr, vpn_id, fib_id, oui): + dhcp = pkt[DHCP] + found = 0 + data = [] + id_len = len(vpn_id) + + for i in dhcp.options: + if isinstance(i, tuple): + if i[0] == "relay_agent_Information": + # + # There are two sb-options present - each of length 6. + # + data = i[1] + if oui != 0: + self.assertEqual(len(data), 24) + elif len(vpn_id) > 0: + self.assertEqual(len(data), len(vpn_id) + 17) + else: + self.assertEqual(len(data), 12) + + # + # First sub-option is ID 1, len 4, then encoded + # sw_if_index. This test uses low valued indicies + # so [2:4] are 0. + # The ID space is VPP internal - so no matching value + # scapy + # + self.assertEqual(ord(data[0]), 1) + self.assertEqual(ord(data[1]), 4) + self.assertEqual(ord(data[2]), 0) + self.assertEqual(ord(data[3]), 0) + self.assertEqual(ord(data[4]), 0) + self.assertEqual(ord(data[5]), intf._sw_if_index) + + # + # next sub-option is the IP address of the client side + # interface. + # sub-option ID=5, length (of a v4 address)=4 + # + claddr = socket.inet_pton(AF_INET, ip_addr) + + self.assertEqual(ord(data[6]), 5) + self.assertEqual(ord(data[7]), 4) + self.assertEqual(data[8], claddr[0]) + self.assertEqual(data[9], claddr[1]) + self.assertEqual(data[10], claddr[2]) + self.assertEqual(data[11], claddr[3]) + + if oui != 0: + # sub-option 151 encodes vss_type 1, + # the 3 byte oui and the 4 byte fib_id + self.assertEqual(id_len, 0) + self.assertEqual(ord(data[12]), 151) + self.assertEqual(ord(data[13]), 8) + self.assertEqual(ord(data[14]), 1) + self.assertEqual(ord(data[15]), 0) + self.assertEqual(ord(data[16]), 0) + self.assertEqual(ord(data[17]), oui) + self.assertEqual(ord(data[18]), 0) + self.assertEqual(ord(data[19]), 0) + self.assertEqual(ord(data[20]), 0) + self.assertEqual(ord(data[21]), fib_id) + + # VSS control sub-option + self.assertEqual(ord(data[22]), 152) + self.assertEqual(ord(data[23]), 0) + + if id_len > 0: + # sub-option 151 encode vss_type of 0 + # followerd by vpn_id in ascii + self.assertEqual(oui, 0) + self.assertEqual(ord(data[12]), 151) + self.assertEqual(ord(data[13]), id_len + 1) + self.assertEqual(ord(data[14]), 0) + self.assertEqual(data[15:15 + id_len], vpn_id) + + # VSS control sub-option + self.assertEqual(ord(data[15 + len(vpn_id)]), 152) + self.assertEqual(ord(data[16 + len(vpn_id)]), 0) + + found = 1 + self.assertTrue(found) + + return data + + def verify_dhcp_msg_type(self, pkt, name): + dhcp = pkt[DHCP] + found = False + for o in dhcp.options: + if isinstance(o, tuple): + if o[0] == "message-type" \ + and DHCPTypes[o[1]] == name: + found = True + self.assertTrue(found) + + def verify_dhcp_offer(self, pkt, intf, vpn_id="", fib_id=0, oui=0): + ether = pkt[Ether] + self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff") + self.assertEqual(ether.src, intf.local_mac) + + ip = pkt[IP] + self.assertEqual(ip.dst, "255.255.255.255") + self.assertEqual(ip.src, intf.local_ip4) + + udp = pkt[UDP] + self.assertEqual(udp.dport, DHCP4_CLIENT_PORT) + self.assertEqual(udp.sport, DHCP4_SERVER_PORT) + + self.verify_dhcp_msg_type(pkt, "offer") + data = self.validate_relay_options(pkt, intf, intf.local_ip4, + vpn_id, fib_id, oui) + + def verify_orig_dhcp_pkt(self, pkt, intf, dscp, l2_bc=True): + ether = pkt[Ether] + if l2_bc: + self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff") + else: + self.assertEqual(ether.dst, intf.remote_mac) + self.assertEqual(ether.src, intf.local_mac) + + ip = pkt[IP] + + if (l2_bc): + self.assertEqual(ip.dst, "255.255.255.255") + self.assertEqual(ip.src, "0.0.0.0") + else: + self.assertEqual(ip.dst, intf.remote_ip4) + self.assertEqual(ip.src, intf.local_ip4) + self.assertEqual(ip.tos, dscp) + + udp = pkt[UDP] + self.assertEqual(udp.dport, DHCP4_SERVER_PORT) + self.assertEqual(udp.sport, DHCP4_CLIENT_PORT) + + def verify_orig_dhcp_discover(self, pkt, intf, hostname, client_id=None, + broadcast=True, dscp=0): + self.verify_orig_dhcp_pkt(pkt, intf, dscp) + + self.verify_dhcp_msg_type(pkt, "discover") + self.verify_dhcp_has_option(pkt, "hostname", hostname) + if client_id: + self.verify_dhcp_has_option(pkt, "client_id", client_id) + bootp = pkt[BOOTP] + self.assertEqual(bootp.ciaddr, "0.0.0.0") + self.assertEqual(bootp.giaddr, "0.0.0.0") + if broadcast: + self.assertEqual(bootp.flags, 0x8000) + else: + self.assertEqual(bootp.flags, 0x0000) + + def verify_orig_dhcp_request(self, pkt, intf, hostname, ip, + broadcast=True, + l2_bc=True, + dscp=0): + self.verify_orig_dhcp_pkt(pkt, intf, dscp, l2_bc=l2_bc) + + self.verify_dhcp_msg_type(pkt, "request") + self.verify_dhcp_has_option(pkt, "hostname", hostname) + self.verify_dhcp_has_option(pkt, "requested_addr", ip) + bootp = pkt[BOOTP] + + if l2_bc: + self.assertEqual(bootp.ciaddr, "0.0.0.0") + else: + self.assertEqual(bootp.ciaddr, intf.local_ip4) + self.assertEqual(bootp.giaddr, "0.0.0.0") + + if broadcast: + self.assertEqual(bootp.flags, 0x8000) + else: + self.assertEqual(bootp.flags, 0x0000) + + def verify_relayed_dhcp_discover(self, pkt, intf, src_intf=None, + fib_id=0, oui=0, + vpn_id="", + dst_mac=None, dst_ip=None): + if not dst_mac: + dst_mac = intf.remote_mac + if not dst_ip: + dst_ip = intf.remote_ip4 + + ether = pkt[Ether] + self.assertEqual(ether.dst, dst_mac) + self.assertEqual(ether.src, intf.local_mac) + + ip = pkt[IP] + self.assertEqual(ip.dst, dst_ip) + self.assertEqual(ip.src, intf.local_ip4) + + udp = pkt[UDP] + self.assertEqual(udp.dport, DHCP4_SERVER_PORT) + self.assertEqual(udp.sport, DHCP4_CLIENT_PORT) + + dhcp = pkt[DHCP] + + is_discover = False + for o in dhcp.options: + if isinstance(o, tuple): + if o[0] == "message-type" \ + and DHCPTypes[o[1]] == "discover": + is_discover = True + self.assertTrue(is_discover) + + data = self.validate_relay_options(pkt, src_intf, + src_intf.local_ip4, + vpn_id, + fib_id, oui) + return data + + def verify_dhcp6_solicit(self, pkt, intf, + peer_ip, peer_mac, + vpn_id="", + fib_id=0, + oui=0, + dst_mac=None, + dst_ip=None): + if not dst_mac: + dst_mac = intf.remote_mac + if not dst_ip: + dst_ip = in6_ptop(intf.remote_ip6) + + ether = pkt[Ether] + self.assertEqual(ether.dst, dst_mac) + self.assertEqual(ether.src, intf.local_mac) + + ip = pkt[IPv6] + self.assertEqual(in6_ptop(ip.dst), dst_ip) + self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6)) + + udp = pkt[UDP] + self.assertEqual(udp.dport, DHCP6_CLIENT_PORT) + self.assertEqual(udp.sport, DHCP6_SERVER_PORT) + + relay = pkt[DHCP6_RelayForward] + self.assertEqual(in6_ptop(relay.peeraddr), in6_ptop(peer_ip)) + oid = pkt[DHCP6OptIfaceId] + cll = pkt[DHCP6OptClientLinkLayerAddr] + self.assertEqual(cll.optlen, 8) + self.assertEqual(cll.lltype, 1) + self.assertEqual(cll.clladdr, peer_mac) + + id_len = len(vpn_id) + + if fib_id != 0: + self.assertEqual(id_len, 0) + vss = pkt[DHCP6OptVSS] + self.assertEqual(vss.optlen, 8) + self.assertEqual(vss.type, 1) + # the OUI and FIB-id are really 3 and 4 bytes resp. + # but the tested range is small + self.assertEqual(ord(vss.data[0]), 0) + self.assertEqual(ord(vss.data[1]), 0) + self.assertEqual(ord(vss.data[2]), oui) + self.assertEqual(ord(vss.data[3]), 0) + self.assertEqual(ord(vss.data[4]), 0) + self.assertEqual(ord(vss.data[5]), 0) + self.assertEqual(ord(vss.data[6]), fib_id) + + if id_len > 0: + self.assertEqual(oui, 0) + vss = pkt[DHCP6OptVSS] + self.assertEqual(vss.optlen, id_len + 1) + self.assertEqual(vss.type, 0) + self.assertEqual(vss.data[0:id_len], vpn_id) + + # the relay message should be an encoded Solicit + msg = pkt[DHCP6OptRelayMsg] + sol = DHCP6_Solicit() + self.assertEqual(msg.optlen, len(str(sol))) + self.assertEqual(str(sol), (str(msg[1]))[:msg.optlen]) + + def verify_dhcp6_advert(self, pkt, intf, peer): + ether = pkt[Ether] + self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff") + self.assertEqual(ether.src, intf.local_mac) + + ip = pkt[IPv6] + self.assertEqual(in6_ptop(ip.dst), in6_ptop(peer)) + self.assertEqual(in6_ptop(ip.src), in6_ptop(intf.local_ip6)) + + udp = pkt[UDP] + self.assertEqual(udp.dport, DHCP6_SERVER_PORT) + self.assertEqual(udp.sport, DHCP6_CLIENT_PORT) + + # not sure why this is not decoding + # adv = pkt[DHCP6_Advertise] + + def wait_for_no_route(self, address, length, + n_tries=50, s_time=1): + while (n_tries): + if not find_route(self, address, length): + return True + n_tries = n_tries - 1 + self.sleep(s_time) + + return False + + def test_dhcp_proxy(self): + """ DHCPv4 Proxy """ + + # + # Verify no response to DHCP request without DHCP config + # + p_disc_vrf0 = (Ether(dst="ff:ff:ff:ff:ff:ff", + src=self.pg3.remote_mac) / + IP(src="0.0.0.0", dst="255.255.255.255") / + UDP(sport=DHCP4_CLIENT_PORT, + dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'discover'), ('end')])) + pkts_disc_vrf0 = [p_disc_vrf0] + p_disc_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff", + src=self.pg4.remote_mac) / + IP(src="0.0.0.0", dst="255.255.255.255") / + UDP(sport=DHCP4_CLIENT_PORT, + dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'discover'), ('end')])) + pkts_disc_vrf1 = [p_disc_vrf1] + p_disc_vrf2 = (Ether(dst="ff:ff:ff:ff:ff:ff", + src=self.pg5.remote_mac) / + IP(src="0.0.0.0", dst="255.255.255.255") / + UDP(sport=DHCP4_CLIENT_PORT, + dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'discover'), ('end')])) + pkts_disc_vrf2 = [p_disc_vrf2] + + self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0, + "DHCP with no configuration") + self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1, + "DHCP with no configuration") + self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2, + "DHCP with no configuration") + + # + # Enable DHCP proxy in VRF 0 + # + server_addr = self.pg0.remote_ip4 + src_addr = self.pg0.local_ip4 + + Proxy = VppDHCPProxy(self, server_addr, src_addr, rx_vrf_id=0) + Proxy.add_vpp_config() + + # + # Discover packets from the client are dropped because there is no + # IP address configured on the client facing interface + # + self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0, + "Discover DHCP no relay address") + + # + # Inject a response from the server + # dropped, because there is no IP addrees on the + # client interfce to fill in the option. + # + p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), ('end')])) + pkts = [p] + + self.send_and_assert_no_replies(self.pg3, pkts, + "Offer DHCP no relay address") + + # + # configure an IP address on the client facing interface + # + self.pg3.config_ip4() + + # + # Try again with a discover packet + # Rx'd packet should be to the server address and from the configured + # source address + # UDP source ports are unchanged + # we've no option 82 config so that should be absent + # + self.pg3.add_stream(pkts_disc_vrf0) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg0.get_capture(1) + rx = rx[0] + + option_82 = self.verify_relayed_dhcp_discover(rx, self.pg0, + src_intf=self.pg3) + + # + # Create an DHCP offer reply from the server with a correctly formatted + # option 82. i.e. send back what we just captured + # The offer, sent mcast to the client, still has option 82. + # + p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', option_82), + ('end')])) + pkts = [p] + + self.pg0.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + rx = rx[0] + + self.verify_dhcp_offer(rx, self.pg3) + + # + # Bogus Option 82: + # + # 1. not our IP address = not checked by VPP? so offer is replayed + # to client + bad_ip = option_82[0:8] + scapy.compat.chb(33) + option_82[9:] + + p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', bad_ip), + ('end')])) + pkts = [p] + self.send_and_assert_no_replies(self.pg0, pkts, + "DHCP offer option 82 bad address") + + # 2. Not a sw_if_index VPP knows + bad_if_index = option_82[0:2] + scapy.compat.chb(33) + option_82[3:] + + p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', bad_if_index), + ('end')])) + pkts = [p] + self.send_and_assert_no_replies(self.pg0, pkts, + "DHCP offer option 82 bad if index") + + # + # Send a DHCP request in VRF 1. should be dropped. + # + self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1, + "DHCP with no configuration VRF 1") + + # + # Delete the DHCP config in VRF 0 + # Should now drop requests. + # + Proxy.remove_vpp_config() + + self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0, + "DHCP config removed VRF 0") + self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1, + "DHCP config removed VRF 1") + + # + # Add DHCP config for VRF 1 & 2 + # + server_addr1 = self.pg1.remote_ip4 + src_addr1 = self.pg1.local_ip4 + Proxy1 = VppDHCPProxy( + self, + server_addr1, + src_addr1, + rx_vrf_id=1, + server_vrf_id=1) + Proxy1.add_vpp_config() + + server_addr2 = self.pg2.remote_ip4 + src_addr2 = self.pg2.local_ip4 + Proxy2 = VppDHCPProxy( + self, + server_addr2, + src_addr2, + rx_vrf_id=2, + server_vrf_id=2) + Proxy2.add_vpp_config() + + # + # Confim DHCP requests ok in VRF 1 & 2. + # - dropped on IP config on client interface + # + self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1, + "DHCP config removed VRF 1") + self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2, + "DHCP config removed VRF 2") + + # + # configure an IP address on the client facing interface + # + self.pg4.config_ip4() + self.pg4.add_stream(pkts_disc_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + rx = self.pg1.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg4) + + self.pg5.config_ip4() + self.pg5.add_stream(pkts_disc_vrf2) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + rx = self.pg2.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg2, src_intf=self.pg5) + + # + # Add VSS config + # table=1, vss_type=1, vpn_index=1, oui=4 + # table=2, vss_type=0, vpn_id = "ip4-table-2" + self.vapi.dhcp_proxy_set_vss(tbl_id=1, vss_type=1, + vpn_index=1, oui=4, is_add=1) + self.vapi.dhcp_proxy_set_vss(tbl_id=2, vss_type=0, + vpn_ascii_id="ip4-table-2", is_add=1) + + self.pg4.add_stream(pkts_disc_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg1, + src_intf=self.pg4, + fib_id=1, oui=4) + + self.pg5.add_stream(pkts_disc_vrf2) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg2.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg2, + src_intf=self.pg5, + vpn_id="ip4-table-2") + + # + # Add a second DHCP server in VRF 1 + # expect clients messages to be relay to both configured servers + # + self.pg1.generate_remote_hosts(2) + server_addr12 = self.pg1.remote_hosts[1].ip4 + + Proxy12 = VppDHCPProxy( + self, + server_addr12, + src_addr, + rx_vrf_id=1, + server_vrf_id=1) + Proxy12.add_vpp_config() + + # + # We'll need an ARP entry for the server to send it packets + # + arp_entry = VppNeighbor(self, + self.pg1.sw_if_index, + self.pg1.remote_hosts[1].mac, + self.pg1.remote_hosts[1].ip4) + arp_entry.add_vpp_config() + + # + # Send a discover from the client. expect two relayed messages + # The frist packet is sent to the second server + # We're not enforcing that here, it's just the way it is. + # + self.pg4.add_stream(pkts_disc_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(2) + + option_82 = self.verify_relayed_dhcp_discover( + rx[0], self.pg1, + src_intf=self.pg4, + dst_mac=self.pg1.remote_hosts[1].mac, + dst_ip=self.pg1.remote_hosts[1].ip4, + fib_id=1, oui=4) + self.verify_relayed_dhcp_discover(rx[1], self.pg1, + src_intf=self.pg4, + fib_id=1, oui=4) + + # + # Send both packets back. Client gets both. + # + p1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / + IP(src=self.pg1.remote_ip4, dst=self.pg1.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', option_82), + ('end')])) + p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / + IP(src=self.pg1.remote_hosts[1].ip4, dst=self.pg1.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', option_82), + ('end')])) + pkts = [p1, p2] + + self.pg1.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg4.get_capture(2) + + self.verify_dhcp_offer(rx[0], self.pg4, fib_id=1, oui=4) + self.verify_dhcp_offer(rx[1], self.pg4, fib_id=1, oui=4) + + # + # Ensure offers from non-servers are dropeed + # + p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / + IP(src="8.8.8.8", dst=self.pg1.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'offer'), + ('relay_agent_Information', option_82), + ('end')])) + self.send_and_assert_no_replies(self.pg1, p2, + "DHCP offer from non-server") + + # + # Ensure only the discover is sent to multiple servers + # + p_req_vrf1 = (Ether(dst="ff:ff:ff:ff:ff:ff", + src=self.pg4.remote_mac) / + IP(src="0.0.0.0", dst="255.255.255.255") / + UDP(sport=DHCP4_CLIENT_PORT, + dport=DHCP4_SERVER_PORT) / + BOOTP(op=1) / + DHCP(options=[('message-type', 'request'), + ('end')])) + + self.pg4.add_stream(p_req_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + # + # Remove the second DHCP server + # + Proxy12.remove_vpp_config() + + # + # Test we can still relay with the first + # + self.pg4.add_stream(pkts_disc_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg1, + src_intf=self.pg4, + fib_id=1, oui=4) + + # + # Remove the VSS config + # relayed DHCP has default vlaues in the option. + # + self.vapi.dhcp_proxy_set_vss(tbl_id=1, is_add=0) + self.vapi.dhcp_proxy_set_vss(tbl_id=2, is_add=0) + + self.pg4.add_stream(pkts_disc_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + rx = rx[0] + self.verify_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg4) + + # + # remove DHCP config to cleanup + # + Proxy1.remove_vpp_config() + Proxy2.remove_vpp_config() + + self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf0, + "DHCP cleanup VRF 0") + self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1, + "DHCP cleanup VRF 1") + self.send_and_assert_no_replies(self.pg5, pkts_disc_vrf2, + "DHCP cleanup VRF 2") + + self.pg3.unconfig_ip4() + self.pg4.unconfig_ip4() + self.pg5.unconfig_ip4() + + def test_dhcp6_proxy(self): + """ DHCPv6 Proxy""" + # + # Verify no response to DHCP request without DHCP config + # + dhcp_solicit_dst = "ff02::1:2" + dhcp_solicit_src_vrf0 = mk_ll_addr(self.pg3.remote_mac) + dhcp_solicit_src_vrf1 = mk_ll_addr(self.pg4.remote_mac) + dhcp_solicit_src_vrf2 = mk_ll_addr(self.pg5.remote_mac) + server_addr_vrf0 = self.pg0.remote_ip6 + src_addr_vrf0 = self.pg0.local_ip6 + server_addr_vrf1 = self.pg1.remote_ip6 + src_addr_vrf1 = self.pg1.local_ip6 + server_addr_vrf2 = self.pg2.remote_ip6 + src_addr_vrf2 = self.pg2.local_ip6 + + dmac = in6_getnsmac(inet_pton(socket.AF_INET6, dhcp_solicit_dst)) + p_solicit_vrf0 = (Ether(dst=dmac, src=self.pg3.remote_mac) / + IPv6(src=dhcp_solicit_src_vrf0, + dst=dhcp_solicit_dst) / + UDP(sport=DHCP6_SERVER_PORT, + dport=DHCP6_CLIENT_PORT) / + DHCP6_Solicit()) + p_solicit_vrf1 = (Ether(dst=dmac, src=self.pg4.remote_mac) / + IPv6(src=dhcp_solicit_src_vrf1, + dst=dhcp_solicit_dst) / + UDP(sport=DHCP6_SERVER_PORT, + dport=DHCP6_CLIENT_PORT) / + DHCP6_Solicit()) + p_solicit_vrf2 = (Ether(dst=dmac, src=self.pg5.remote_mac) / + IPv6(src=dhcp_solicit_src_vrf2, + dst=dhcp_solicit_dst) / + UDP(sport=DHCP6_SERVER_PORT, + dport=DHCP6_CLIENT_PORT) / + DHCP6_Solicit()) + + self.send_and_assert_no_replies(self.pg3, p_solicit_vrf0, + "DHCP with no configuration") + self.send_and_assert_no_replies(self.pg4, p_solicit_vrf1, + "DHCP with no configuration") + self.send_and_assert_no_replies(self.pg5, p_solicit_vrf2, + "DHCP with no configuration") + + # + # DHCPv6 config in VRF 0. + # Packets still dropped because the client facing interface has no + # IPv6 config + # + Proxy = VppDHCPProxy( + self, + server_addr_vrf0, + src_addr_vrf0, + rx_vrf_id=0, + server_vrf_id=0) + Proxy.add_vpp_config() + + self.send_and_assert_no_replies(self.pg3, p_solicit_vrf0, + "DHCP with no configuration") + self.send_and_assert_no_replies(self.pg4, p_solicit_vrf1, + "DHCP with no configuration") + + # + # configure an IP address on the client facing interface + # + self.pg3.config_ip6() + + # + # Now the DHCP requests are relayed to the server + # + self.pg3.add_stream(p_solicit_vrf0) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg0.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg0, + dhcp_solicit_src_vrf0, + self.pg3.remote_mac) + + # + # Exception cases for rejected relay responses + # + + # 1 - not a relay reply + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_Advertise()) + self.send_and_assert_no_replies(self.pg3, p_adv_vrf0, + "DHCP6 not a relay reply") + + # 2 - no relay message option + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply() / + DHCP6_Advertise()) + self.send_and_assert_no_replies(self.pg3, p_adv_vrf0, + "DHCP not a relay message") + + # 3 - no circuit ID + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply() / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise()) + self.send_and_assert_no_replies(self.pg3, p_adv_vrf0, + "DHCP6 no circuit ID") + # 4 - wrong circuit ID + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply() / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise()) + self.send_and_assert_no_replies(self.pg3, p_adv_vrf0, + "DHCP6 wrong circuit ID") + + # + # Send the relay response (the advertisement) + # - no peer address + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply() / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x04') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + pkts_adv_vrf0 = [p_adv_vrf0] + + self.pg0.add_stream(pkts_adv_vrf0) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + + self.verify_dhcp6_advert(rx[0], self.pg3, "::") + + # + # Send the relay response (the advertisement) + # - with peer address + p_adv_vrf0 = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / + IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf0) / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x04') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + pkts_adv_vrf0 = [p_adv_vrf0] + + self.pg0.add_stream(pkts_adv_vrf0) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + + self.verify_dhcp6_advert(rx[0], self.pg3, dhcp_solicit_src_vrf0) + + # + # Add all the config for VRF 1 & 2 + # + Proxy1 = VppDHCPProxy( + self, + server_addr_vrf1, + src_addr_vrf1, + rx_vrf_id=1, + server_vrf_id=1) + Proxy1.add_vpp_config() + self.pg4.config_ip6() + + Proxy2 = VppDHCPProxy( + self, + server_addr_vrf2, + src_addr_vrf2, + rx_vrf_id=2, + server_vrf_id=2) + Proxy2.add_vpp_config() + self.pg5.config_ip6() + + # + # VRF 1 solicit + # + self.pg4.add_stream(p_solicit_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac) + + # + # VRF 2 solicit + # + self.pg5.add_stream(p_solicit_vrf2) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg2.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg2, + dhcp_solicit_src_vrf2, + self.pg5.remote_mac) + + # + # VRF 1 Advert + # + p_adv_vrf1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / + IPv6(dst=self.pg1.local_ip6, src=self.pg1.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + pkts_adv_vrf1 = [p_adv_vrf1] + + self.pg1.add_stream(pkts_adv_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg4.get_capture(1) + + self.verify_dhcp6_advert(rx[0], self.pg4, dhcp_solicit_src_vrf1) + + # + # Add VSS config + # + self.vapi.dhcp_proxy_set_vss( + tbl_id=1, vss_type=1, oui=4, vpn_index=1, is_ipv6=1, is_add=1) + self.vapi.dhcp_proxy_set_vss( + tbl_id=2, + vss_type=0, + vpn_ascii_id="IPv6-table-2", + is_ipv6=1, + is_add=1) + + self.pg4.add_stream(p_solicit_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac, + fib_id=1, + oui=4) + + self.pg5.add_stream(p_solicit_vrf2) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg2.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg2, + dhcp_solicit_src_vrf2, + self.pg5.remote_mac, + vpn_id="IPv6-table-2") + + # + # Remove the VSS config + # relayed DHCP has default vlaues in the option. + # + self.vapi.dhcp_proxy_set_vss(tbl_id=1, is_ipv6=1, is_add=0) + + self.pg4.add_stream(p_solicit_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac) + + # + # Add a second DHCP server in VRF 1 + # expect clients messages to be relay to both configured servers + # + self.pg1.generate_remote_hosts(2) + server_addr12 = self.pg1.remote_hosts[1].ip6 + + Proxy12 = VppDHCPProxy( + self, + server_addr12, + src_addr_vrf1, + rx_vrf_id=1, + server_vrf_id=1) + Proxy12.add_vpp_config() + + # + # We'll need an ND entry for the server to send it packets + # + nd_entry = VppNeighbor(self, + self.pg1.sw_if_index, + self.pg1.remote_hosts[1].mac, + self.pg1.remote_hosts[1].ip6) + nd_entry.add_vpp_config() + + # + # Send a discover from the client. expect two relayed messages + # The frist packet is sent to the second server + # We're not enforcing that here, it's just the way it is. + # + self.pg4.add_stream(p_solicit_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(2) + + self.verify_dhcp6_solicit(rx[0], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac) + self.verify_dhcp6_solicit(rx[1], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac, + dst_mac=self.pg1.remote_hosts[1].mac, + dst_ip=self.pg1.remote_hosts[1].ip6) + + # + # Send both packets back. Client gets both. + # + p1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / + IPv6(dst=self.pg1.local_ip6, src=self.pg1.remote_ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_hosts[1].mac) / + IPv6(dst=self.pg1.local_ip6, src=self.pg1._remote_hosts[1].ip6) / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + + pkts = [p1, p2] + + self.pg1.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg4.get_capture(2) + + self.verify_dhcp6_advert(rx[0], self.pg4, dhcp_solicit_src_vrf1) + self.verify_dhcp6_advert(rx[1], self.pg4, dhcp_solicit_src_vrf1) + + # + # Ensure only solicit messages are duplicated + # + p_request_vrf1 = (Ether(dst=dmac, src=self.pg4.remote_mac) / + IPv6(src=dhcp_solicit_src_vrf1, + dst=dhcp_solicit_dst) / + UDP(sport=DHCP6_SERVER_PORT, + dport=DHCP6_CLIENT_PORT) / + DHCP6_Request()) + + self.pg4.add_stream(p_request_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + # + # Test we drop DHCP packets from addresses that are not configured as + # DHCP servers + # + p2 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_hosts[1].mac) / + IPv6(dst=self.pg1.local_ip6, src="3001::1") / + UDP(sport=DHCP6_SERVER_PORT, dport=DHCP6_SERVER_PORT) / + DHCP6_RelayReply(peeraddr=dhcp_solicit_src_vrf1) / + DHCP6OptIfaceId(optlen=4, ifaceid='\x00\x00\x00\x05') / + DHCP6OptRelayMsg(optlen=0) / + DHCP6_Advertise(trid=1) / + DHCP6OptStatusCode(statuscode=0)) + self.send_and_assert_no_replies(self.pg1, p2, + "DHCP6 not from server") + + # + # Remove the second DHCP server + # + Proxy12.remove_vpp_config() + + # + # Test we can still relay with the first + # + self.pg4.add_stream(p_solicit_vrf1) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg1.get_capture(1) + + self.verify_dhcp6_solicit(rx[0], self.pg1, + dhcp_solicit_src_vrf1, + self.pg4.remote_mac) + + # + # Cleanup + # + Proxy.remove_vpp_config() + Proxy1.remove_vpp_config() + Proxy2.remove_vpp_config() + + self.pg3.unconfig_ip6() + self.pg4.unconfig_ip6() + self.pg5.unconfig_ip6() + + def test_dhcp_client(self): + """ DHCP Client""" + + vdscp = VppEnum.vl_api_ip_dscp_t + hostname = 'universal-dp' + + self.pg_enable_capture(self.pg_interfaces) + + # + # Configure DHCP client on PG3 and capture the discover sent + # + Client = VppDHCPClient(self, self.pg3.sw_if_index, hostname) + Client.add_vpp_config() + self.assertTrue(Client.query_vpp_config()) + + rx = self.pg3.get_capture(1) + + self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname) + + # + # Send back on offer, expect the request + # + p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst="255.255.255.255") / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, + yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'offer'), + ('server_id', self.pg3.remote_ip4), + 'end'])) + + self.pg3.add_stream(p_offer) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + self.verify_orig_dhcp_request(rx[0], self.pg3, hostname, + self.pg3.local_ip4) + + # + # Send an acknowledgment + # + p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst="255.255.255.255") / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'ack'), + ('subnet_mask', "255.255.255.0"), + ('router', self.pg3.remote_ip4), + ('server_id', self.pg3.remote_ip4), + ('lease_time', 43200), + 'end'])) + + self.pg3.add_stream(p_ack) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + # + # We'll get an ARP request for the router address + # + rx = self.pg3.get_capture(1) + + self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4) + self.pg_enable_capture(self.pg_interfaces) + + # + # At the end of this procedure there should be a connected route + # in the FIB + # + self.assertTrue(find_route(self, self.pg3.local_ip4, 24)) + self.assertTrue(find_route(self, self.pg3.local_ip4, 32)) + + # remove the left over ARP entry + self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index, + self.pg3.remote_mac, + self.pg3.remote_ip4, + is_add=0) + + # + # remove the DHCP config + # + Client.remove_vpp_config() + + # + # and now the route should be gone + # + self.assertFalse(find_route(self, self.pg3.local_ip4, 32)) + self.assertFalse(find_route(self, self.pg3.local_ip4, 24)) + + # + # Start the procedure again. this time have VPP send the client-ID + # and set the DSCP value + # + self.pg3.admin_down() + self.sleep(1) + self.pg3.admin_up() + Client.set_client(self.pg3.sw_if_index, hostname, + id=self.pg3.local_mac, + dscp=vdscp.IP_API_DSCP_EF) + Client.add_vpp_config() + + rx = self.pg3.get_capture(1) + + self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname, + self.pg3.local_mac, + dscp=vdscp.IP_API_DSCP_EF) + + # TODO: VPP DHCP client should not accept DHCP OFFER message with + # the XID (Transaction ID) not matching the XID of the most recent + # DHCP DISCOVERY message. + # Such DHCP OFFER message must be silently discarded - RFC2131. + # Reported in Jira ticket: VPP-99 + self.pg3.add_stream(p_offer) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + self.verify_orig_dhcp_request(rx[0], self.pg3, hostname, + self.pg3.local_ip4, + dscp=vdscp.IP_API_DSCP_EF) + + # + # unicast the ack to the offered address + # + p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'ack'), + ('subnet_mask', "255.255.255.0"), + ('router', self.pg3.remote_ip4), + ('server_id', self.pg3.remote_ip4), + ('lease_time', 43200), + 'end'])) + + self.pg3.add_stream(p_ack) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + # + # We'll get an ARP request for the router address + # + rx = self.pg3.get_capture(1) + + self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4) + self.pg_enable_capture(self.pg_interfaces) + + # + # At the end of this procedure there should be a connected route + # in the FIB + # + self.assertTrue(find_route(self, self.pg3.local_ip4, 32)) + self.assertTrue(find_route(self, self.pg3.local_ip4, 24)) + + # + # remove the DHCP config + # + Client.remove_vpp_config() + + self.assertFalse(find_route(self, self.pg3.local_ip4, 32)) + self.assertFalse(find_route(self, self.pg3.local_ip4, 24)) + + # + # Rince and repeat, this time with VPP configured not to set + # the braodcast flag in the discover and request messages, + # and for the server to unicast the responses. + # + # Configure DHCP client on PG3 and capture the discover sent + # + Client.set_client( + self.pg3.sw_if_index, + hostname, + set_broadcast_flag=False) + Client.add_vpp_config() + + rx = self.pg3.get_capture(1) + + self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname, + broadcast=False) + + # + # Send back on offer, unicasted to the offered address. + # Expect the request. + # + p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'offer'), + ('server_id', self.pg3.remote_ip4), + 'end'])) + + self.pg3.add_stream(p_offer) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + self.verify_orig_dhcp_request(rx[0], self.pg3, hostname, + self.pg3.local_ip4, + broadcast=False) + + # + # Send an acknowledgment, the lease renewal time is 2 seconds + # so we should expect the renew straight after + # + p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4) / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'ack'), + ('subnet_mask', "255.255.255.0"), + ('router', self.pg3.remote_ip4), + ('server_id', self.pg3.remote_ip4), + ('lease_time', 43200), + ('renewal_time', 2), + 'end'])) + + self.pg3.add_stream(p_ack) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + # + # We'll get an ARP request for the router address + # + rx = self.pg3.get_capture(1) + + self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4) + self.pg_enable_capture(self.pg_interfaces) + + # + # At the end of this procedure there should be a connected route + # in the FIB + # + self.assertTrue(find_route(self, self.pg3.local_ip4, 24)) + self.assertTrue(find_route(self, self.pg3.local_ip4, 32)) + + # + # wait for the unicasted renewal + # the first attempt will be an ARP packet, since we have not yet + # responded to VPP's request + # + self.logger.info(self.vapi.cli("sh dhcp client intfc pg3 verbose")) + rx = self.pg3.get_capture(1, timeout=10) + + self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4) + + # respond to the arp + p_arp = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + ARP(op="is-at", + hwdst=self.pg3.local_mac, + hwsrc=self.pg3.remote_mac, + pdst=self.pg3.local_ip4, + psrc=self.pg3.remote_ip4)) + self.pg3.add_stream(p_arp) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + # the next packet is the unicasted renewal + rx = self.pg3.get_capture(1, timeout=10) + self.verify_orig_dhcp_request(rx[0], self.pg3, hostname, + self.pg3.local_ip4, + l2_bc=False, + broadcast=False) + + # + # read the DHCP client details from a dump + # + clients = self.vapi.dhcp_client_dump() + + self.assertEqual(clients[0].client.sw_if_index, + self.pg3.sw_if_index) + self.assertEqual(clients[0].lease.sw_if_index, + self.pg3.sw_if_index) + self.assertEqual(clients[0].client.hostname.rstrip('\0'), + hostname) + self.assertEqual(clients[0].lease.hostname.rstrip('\0'), + hostname) + # 0 = DISCOVER, 1 = REQUEST, 2 = BOUND + self.assertEqual(clients[0].lease.state, 2) + self.assertEqual(clients[0].lease.mask_width, 24) + self.assertEqual(str(clients[0].lease.router_address), + self.pg3.remote_ip4) + self.assertEqual(str(clients[0].lease.host_address), + self.pg3.local_ip4) + + # remove the left over ARP entry + self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index, + self.pg3.remote_mac, + self.pg3.remote_ip4, + is_add=0) + + # + # remove the DHCP config + # + Client.remove_vpp_config() + + # + # and now the route should be gone + # + self.assertFalse(find_route(self, self.pg3.local_ip4, 32)) + self.assertFalse(find_route(self, self.pg3.local_ip4, 24)) + + # + # Start the procedure again. Use requested lease time option. + # + hostname += "-2" + self.pg3.admin_down() + self.sleep(1) + self.pg3.admin_up() + self.pg_enable_capture(self.pg_interfaces) + Client.set_client(self.pg3.sw_if_index, hostname) + Client.add_vpp_config() + + rx = self.pg3.get_capture(1) + + self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname) + + # + # Send back on offer with requested lease time, expect the request + # + lease_time = 1 + p_offer = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst='255.255.255.255') / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, + yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'offer'), + ('server_id', self.pg3.remote_ip4), + ('lease_time', lease_time), + 'end'])) + + self.pg3.add_stream(p_offer) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + rx = self.pg3.get_capture(1) + self.verify_orig_dhcp_request(rx[0], self.pg3, hostname, + self.pg3.local_ip4) + + # + # Send an acknowledgment + # + p_ack = (Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac) / + IP(src=self.pg3.remote_ip4, dst='255.255.255.255') / + UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) / + BOOTP(op=1, yiaddr=self.pg3.local_ip4, + chaddr=mac_pton(self.pg3.local_mac)) / + DHCP(options=[('message-type', 'ack'), + ('subnet_mask', '255.255.255.0'), + ('router', self.pg3.remote_ip4), + ('server_id', self.pg3.remote_ip4), + ('lease_time', lease_time), + 'end'])) + + self.pg3.add_stream(p_ack) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + + # + # We'll get an ARP request for the router address + # + rx = self.pg3.get_capture(1) + + self.assertEqual(rx[0][ARP].pdst, self.pg3.remote_ip4) + + # + # At the end of this procedure there should be a connected route + # in the FIB + # + self.assertTrue(find_route(self, self.pg3.local_ip4, 32)) + self.assertTrue(find_route(self, self.pg3.local_ip4, 24)) + + # remove the left over ARP entry + self.vapi.ip_neighbor_add_del(self.pg3.sw_if_index, + self.pg3.remote_mac, + self.pg3.remote_ip4, + is_add=0) + + # + # the route should be gone after the lease expires + # + self.assertTrue(self.wait_for_no_route(self.pg3.local_ip4, 32)) + self.assertTrue(self.wait_for_no_route(self.pg3.local_ip4, 24)) + + # + # remove the DHCP config + # + Client.remove_vpp_config() + + def test_dhcp_client_vlan(self): + """ DHCP Client w/ VLAN""" + + vdscp = VppEnum.vl_api_ip_dscp_t + vqos = VppEnum.vl_api_qos_source_t + hostname = 'universal-dp' + + self.pg_enable_capture(self.pg_interfaces) + + vlan_100 = VppDot1QSubint(self, self.pg3, 100) + vlan_100.admin_up() + + output = [scapy.compat.chb(4)] * 256 + os = b''.join(output) + rows = [{'outputs': os}, + {'outputs': os}, + {'outputs': os}, + {'outputs': os}] + + qem1 = VppQosEgressMap(self, 1, rows).add_vpp_config() + qm1 = VppQosMark(self, vlan_100, qem1, + vqos.QOS_API_SOURCE_VLAN).add_vpp_config() + + # + # Configure DHCP client on PG3 and capture the discover sent + # + Client = VppDHCPClient( + self, + vlan_100.sw_if_index, + hostname, + dscp=vdscp.IP_API_DSCP_EF) + Client.add_vpp_config() + + rx = self.pg3.get_capture(1) + + self.assertEqual(rx[0][Dot1Q].vlan, 100) + self.assertEqual(rx[0][Dot1Q].prio, 2) + + self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname, + dscp=vdscp.IP_API_DSCP_EF) + + +if __name__ == '__main__': + unittest.main(testRunner=VppTestRunner) |