#!/usr/bin/env python3 import unittest import socket import six from framework import VppTestCase from asfframework import VppTestRunner, tag_run_solo 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, ARP, Dot1Q from scapy.layers.inet import IP, UDP from scapy.layers.inet6 import IPv6, in6_getnsmac from scapy.layers.dhcp import DHCP, BOOTP, DHCPTypes from scapy.layers.dhcp6 import ( DHCP6_Solicit, DHCP6_RelayForward, DHCP6_RelayReply, DHCP6_Advertise, DHCP6OptRelayMsg, DHCP6OptIfaceId, DHCP6OptStatusCode, DHCP6OptVSS, DHCP6OptClientLinkLayerAddr, DHCP6_Request, ) from socket import AF_INET, AF_INET6, inet_pton 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 from config import config DHCP4_CLIENT_PORT = 68 DHCP4_SERVER_PORT = 67 DHCP6_CLIENT_PORT = 547 DHCP6_SERVER_PORT = 546 @tag_run_solo @unittest.skipIf("dhcp" in config.excluded_plugins, "Exclude DHCP plugin tests") 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(six.byte2int(data[0:1]), 1) self.assertEqual(six.byte2int(data[1:2]), 4) self.assertEqual(six.byte2int(data[2:3]), 0) self.assertEqual(six.byte2int(data[3:4]), 0) self.assertEqual(six.byte2int(data[4:5]), 0) self.assertEqual(six.byte2int(data[5:6]), 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(six.byte2int(data[6:7]), 5) self.assertEqual(six.byte2int(data[7:8]), 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(six.byte2int(data[12:13]), 151) self.assertEqual(six.byte2int(data[13:14]), 8) self.assertEqual(six.byte2int(data[14:15]), 1) self.assertEqual(six.byte2int(data[15:16]), 0) self.assertEqual(six.byte2int(data[16:17]), 0) self.assertEqual(six.byte2int(data[17:18]), oui) self.assertEqual(six.byte2int(data[18:19]), 0) self.assertEqual(six.byte2int(data[19:20]), 0) self.assertEqual(six.byte2int(data[20:21]), 0) self.assertEqual(six.byte2int(data[21:22]), fib_id) # VSS control sub-option self.assertEqual(six.byte2int(data[22:23]), 152) self.assertEqual(six.byte2int(data[23:24]), 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(six.byte2int(data[12:13]), 151) self.assertEqual(six.byte2int(data[13:14]), id_len + 1) self.assertEqual(six.byte2int(data[14:15]), 0) self.assertEqual(data[15 : 15 + id_len].decode("ascii"), vpn_id) # VSS control sub-option self.assertEqual( six.byte2int(data[15 + len(vpn_id) : 16 + len(vpn_id)]), 152 ) self.assertEqual( six.byte2int(data[16 + len(vpn_id) : 17 + 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.encode("ascii")) if client_id: client_id = "\x00" + client_id self.verify_dhcp_has_option(pkt, "client_id", client_id.encode("ascii")) 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.encode("ascii")) 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(six.byte2int(vss.data[0:1]), 0) self.assertEqual(six.byte2int(vss.data[1:2]), 0) self.assertEqual(six.byte2int(vss.data[2:3]), oui) self.assertEqual(six.byte2int(vss.data[3:4]), 0) self.assertEqual(six.byte2int(vss.data[4:5]), 0) self.assertEqual(six.byte2int(vss.data[5:6]), 0) self.assertEqual(six.byte2int(vss.data[6:7]), 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].decode("ascii"), vpn_id) # the relay message should be an encoded Solicit msg = pkt[DHCP6OptRelayMsg] sol = DHCP6_Solicit() self.assertEqual(msg.optlen, len(sol)) self.assertEqual(sol, msg[1]) 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, timeout=5) 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 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)) # # 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, hostname) self.assertEqual(clients[0].lease.hostname, 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) # # 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 ) # send an ACK with different data from the original offer * self.pg3.generate_remote_hosts(4) 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.remote_hosts[3].ip4, chaddr=mac_pton(self.pg3.local_mac), ) / DHCP( options=[ ("message-type", "ack"), ("subnet_mask", "255.255.255.0"), ("router", self.pg3.remote_hosts[1].ip4), ("server_id", self.pg3.remote_hosts[2].ip4), ("lease_time", 43200), ("renewal_time", 2), "end", ] ) ) self.pg3.add_stream(p_ack) self.pg_enable_capture(self.pg_interfaces) self.pg_start() # # 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, hostname) self.assertEqual(clients[0].lease.hostname, 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_hosts[1].ip4 ) self.assertEqual( str(clients[0].lease.host_address), self.pg3.remote_hosts[3].ip4 ) # # 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. # this time wait for the lease to expire and the client to # self-destruct # 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)) # # 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)