from framework import VppTestCase, VppTestRunner
from vpp_neighbor import VppNeighbor
+from vpp_ip_route import find_route, VppIpTable
+from util import mk_ll_addr
-from scapy.layers.l2 import Ether, getmacbyip
+from scapy.layers.l2 import Ether, getmacbyip, ARP
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 socket import AF_INET, AF_INET6
from scapy.utils import inet_pton, inet_ntop
from scapy.utils6 import in6_ptop
+from util import mactobinary
DHCP4_CLIENT_PORT = 68
DHCP4_SERVER_PORT = 67
DHCP6_SERVER_PORT = 546
-def mk_ll_addr(mac):
-
- euid = in6_mactoifaceid(mac)
- addr = "fe80::" + euid
- return addr
-
-
class TestDHCP(VppTestCase):
""" DHCP Test Case """
# create 3 pg interfaces
self.create_pg_interfaces(range(4))
+ self.tables = []
# 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 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[:2]:
i.admin_up()
table_id += 1
def tearDown(self):
- super(TestDHCP, self).tearDown()
- for i in self.pg_interfaces:
+ for i in self.pg_interfaces[:2]:
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 send_and_assert_no_replies(self, intf, pkts, remark):
intf.add_stream(pkts)
for i in self.pg_interfaces:
i.assert_nothing_captured(remark=remark)
+ def verify_dhcp_has_option(self, pkt, option, value):
+ dhcp = pkt[DHCP]
+ found = False
+
+ for i in dhcp.options:
+ if type(i) is tuple:
+ if i[0] == option:
+ self.assertEqual(i[1], value)
+ found = True
+
+ self.assertTrue(found)
+
def validate_relay_options(self, pkt, intf, ip_addr, fib_id, oui):
dhcp = pkt[DHCP]
found = 0
return data
+ def verify_dhcp_msg_type(self, pkt, name):
+ dhcp = pkt[DHCP]
+ found = False
+ for o in dhcp.options:
+ if type(o) is tuple:
+ if o[0] == "message-type" \
+ and DHCPTypes[o[1]] == name:
+ found = True
+ self.assertTrue(found)
+
def verify_dhcp_offer(self, pkt, intf, fib_id=0, oui=0):
ether = pkt[Ether]
self.assertEqual(ether.dst, "ff:ff:ff:ff:ff:ff")
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)
-
+ self.verify_dhcp_msg_type(pkt, "offer")
data = self.validate_relay_options(pkt, intf, intf.local_ip4,
fib_id, oui)
- def verify_dhcp_discover(self, pkt, intf, src_intf=None, fib_id=0, oui=0,
- dst_mac=None, dst_ip=None):
+ def verify_orig_dhcp_pkt(self, pkt, intf):
+ 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, "0.0.0.0")
+
+ 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):
+ self.verify_orig_dhcp_pkt(pkt, intf)
+
+ 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")
+ self.assertEqual(bootp.flags, 0x8000)
+
+ def verify_orig_dhcp_request(self, pkt, intf, hostname, ip):
+ self.verify_orig_dhcp_pkt(pkt, intf)
+
+ 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]
+ self.assertEqual(bootp.ciaddr, "0.0.0.0")
+ self.assertEqual(bootp.giaddr, "0.0.0.0")
+ self.assertEqual(bootp.flags, 0x8000)
+
+ def verify_relayed_dhcp_discover(self, pkt, intf, src_intf=None,
+ fib_id=0, oui=0,
+ dst_mac=None, dst_ip=None):
if not dst_mac:
dst_mac = intf.remote_mac
if not dst_ip:
rx = self.pg0.get_capture(1)
rx = rx[0]
- option_82 = self.verify_dhcp_discover(rx, self.pg0, src_intf=self.pg2)
+ option_82 = self.verify_relayed_dhcp_discover(rx, self.pg0,
+ src_intf=self.pg2)
#
# Create an DHCP offer reply from the server with a correctly formatted
rx = self.pg1.get_capture(1)
rx = rx[0]
- self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3)
+ self.verify_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg3)
#
# Add VSS config
rx = self.pg1.get_capture(1)
rx = rx[0]
- self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3,
- fib_id=1, oui=4)
+ self.verify_relayed_dhcp_discover(rx, self.pg1,
+ src_intf=self.pg3,
+ fib_id=1, oui=4)
#
# Add a second DHCP server in VRF 1
rx = self.pg1.get_capture(2)
- option_82 = self.verify_dhcp_discover(
+ option_82 = self.verify_relayed_dhcp_discover(
rx[0], self.pg1,
src_intf=self.pg3,
dst_mac=self.pg1.remote_hosts[1].mac,
dst_ip=self.pg1.remote_hosts[1].ip4,
fib_id=1, oui=4)
- self.verify_dhcp_discover(rx[1], self.pg1, src_intf=self.pg3,
- fib_id=1, oui=4)
+ self.verify_relayed_dhcp_discover(rx[1], self.pg1,
+ src_intf=self.pg3,
+ fib_id=1, oui=4)
#
# Send both packets back. Client gets both.
rx = self.pg1.get_capture(1)
rx = rx[0]
- self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3,
- fib_id=1, oui=4)
+ self.verify_relayed_dhcp_discover(rx, self.pg1,
+ src_intf=self.pg3,
+ fib_id=1, oui=4)
#
# Remove the VSS config
rx = self.pg1.get_capture(1)
rx = rx[0]
- self.verify_dhcp_discover(rx, self.pg1, src_intf=self.pg3)
+ self.verify_relayed_dhcp_discover(rx, self.pg1, src_intf=self.pg3)
#
# remove DHCP config to cleanup
"DHCP cleanup VRF 0")
self.send_and_assert_no_replies(self.pg3, pkts_disc_vrf1,
"DHCP cleanup VRF 1")
+ self.pg2.unconfig_ip4()
+ self.pg3.unconfig_ip4()
def test_dhcp6_proxy(self):
""" DHCPv6 Proxy"""
server_table_id=0,
is_ipv6=1,
is_add=0)
+ self.pg2.unconfig_ip6()
+ self.pg3.unconfig_ip6()
+
+ def test_dhcp_client(self):
+ """ DHCP Client"""
+
+ hostname = 'universal-dp'
+
+ self.pg_enable_capture(self.pg_interfaces)
+
+ #
+ # Configure DHCP client on PG2 and capture the discover sent
+ #
+ self.vapi.dhcp_client(self.pg2.sw_if_index, hostname)
+
+ rx = self.pg2.get_capture(1)
+
+ self.verify_orig_dhcp_discover(rx[0], self.pg2, hostname)
+
+ #
+ # Sned back on offer, expect the request
+ #
+ p_offer = (Ether(dst=self.pg2.local_mac, src=self.pg2.remote_mac) /
+ IP(src=self.pg2.remote_ip4, dst="255.255.255.255") /
+ UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
+ BOOTP(op=1, yiaddr=self.pg2.local_ip4) /
+ DHCP(options=[('message-type', 'offer'),
+ ('server_id', self.pg2.remote_ip4),
+ ('end')]))
+
+ self.pg2.add_stream(p_offer)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg2.get_capture(1)
+ self.verify_orig_dhcp_request(rx[0], self.pg2, hostname,
+ self.pg2.local_ip4)
+
+ #
+ # Send an acknowloedgement
+ #
+ p_ack = (Ether(dst=self.pg2.local_mac, src=self.pg2.remote_mac) /
+ IP(src=self.pg2.remote_ip4, dst="255.255.255.255") /
+ UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
+ BOOTP(op=1, yiaddr=self.pg2.local_ip4) /
+ DHCP(options=[('message-type', 'ack'),
+ ('subnet_mask', "255.255.255.0"),
+ ('router', self.pg2.remote_ip4),
+ ('server_id', self.pg2.remote_ip4),
+ ('lease_time', 43200),
+ ('end')]))
+
+ self.pg2.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.pg2.get_capture(1)
+
+ self.assertEqual(rx[0][ARP].pdst, self.pg2.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.pg2.local_ip4, 24))
+ self.assertTrue(find_route(self, self.pg2.local_ip4, 32))
+
+ # remove the left over ARP entry
+ self.vapi.ip_neighbor_add_del(self.pg2.sw_if_index,
+ mactobinary(self.pg2.remote_mac),
+ self.pg2.remote_ip4,
+ is_add=0)
+ #
+ # remove the DHCP config
+ #
+ self.vapi.dhcp_client(self.pg2.sw_if_index, hostname, is_add=0)
+
+ #
+ # and now the route should be gone
+ #
+ self.assertFalse(find_route(self, self.pg2.local_ip4, 32))
+ self.assertFalse(find_route(self, self.pg2.local_ip4, 24))
+
+ #
+ # Start the procedure again. this time have VPP send the client-ID
+ #
+ self.pg2.admin_down()
+ self.sleep(1)
+ self.pg2.admin_up()
+ self.vapi.dhcp_client(self.pg2.sw_if_index, hostname,
+ client_id=self.pg2.local_mac)
+
+ rx = self.pg2.get_capture(1)
+
+ self.verify_orig_dhcp_discover(rx[0], self.pg2, hostname,
+ self.pg2.local_mac)
+
+ self.pg2.add_stream(p_offer)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ rx = self.pg2.get_capture(1)
+ self.verify_orig_dhcp_request(rx[0], self.pg2, hostname,
+ self.pg2.local_ip4)
+
+ #
+ # unicast the ack to the offered address
+ #
+ p_ack = (Ether(dst=self.pg2.local_mac, src=self.pg2.remote_mac) /
+ IP(src=self.pg2.remote_ip4, dst=self.pg2.local_ip4) /
+ UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_CLIENT_PORT) /
+ BOOTP(op=1, yiaddr=self.pg2.local_ip4) /
+ DHCP(options=[('message-type', 'ack'),
+ ('subnet_mask', "255.255.255.0"),
+ ('router', self.pg2.remote_ip4),
+ ('server_id', self.pg2.remote_ip4),
+ ('lease_time', 43200),
+ ('end')]))
+
+ self.pg2.add_stream(p_ack)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ #
+ # At the end of this procedure there should be a connected route
+ # in the FIB
+ #
+ self.assertTrue(find_route(self, self.pg2.local_ip4, 32))
+ self.assertTrue(find_route(self, self.pg2.local_ip4, 24))
+
+ #
+ # remove the DHCP config
+ #
+ self.vapi.dhcp_client(self.pg2.sw_if_index, hostname, is_add=0)
+
+ self.assertFalse(find_route(self, self.pg2.local_ip4, 32))
+ self.assertFalse(find_route(self, self.pg2.local_ip4, 24))
+
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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