#!/usr/bin/env python
from __future__ import print_function
"""ACL plugin - MACIP tests
"""
import binascii
import ipad#!/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
from scapy.layers.l2 import Ether, getmacbyip, ARP
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
DHCP4_CLIENT_PORT = 68
DHCP4_SERVER_PORT = 67
DHCP6_CLIENT_PORT = 547
DHCP6_SERVER_PORT = 546
class TestDHCP(VppTestCase):
""" DHCP Test Case """
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 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, vpn_id, fib_id, oui):
dhcp = pkt[DHCP]
found = 0
data = []
id_len = len(vpn_id)
for i in dhcp.options:
if type(i) is tuple:
if i[0] == "relay_agent_Information":
#
# There are two sb-options present - each of length 6.
#
data = i[1]
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 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, 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):
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,
broadcast=1):
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")
if broadcast:
self.assertEqual(bootp.flags, 0x8000)
else:
self.assertEqual(bootp.flags, 0x0000)
def verify_orig_dhcp_request(self, pkt, intf, hostname, ip,
broadcast=1):
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")
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 type(o) is 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 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_ip4n
src_addr = self.pg0.local_ip4n
self.vapi.dhcp_proxy_config(server_addr,
src_addr,
rx_table_id=0)
#
# 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] + chr(33) + option_82[9:]
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
BOOTP(op=1) /
DHCP(options=[('message-type', 'offer'),
('relay_agent_Information', bad_ip),
('end')]))
pkts = [p]
self.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] + chr(33) + option_82[3:]
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
UDP(sport=DHCP4_SERVER_PORT, dport=DHCP4_SERVER_PORT) /
BOOTP(op=1) /
DHCP(options=[('message-type', 'offer'),
('relay_agent_Information', bad_if_index),
('end')]))
pkts = [p]
self.send_and_assert_no_replies(self.pg0, pkts,
"DHCP offer option 82 bad if index")
#
# Send a DHCP request in VRF 1. should be dropped.
#
self.send_and_assert_no_replies(self.pg4, pkts_disc_vrf1,
"DHCP with no configuration VRF 1")
#
# Delete the DHCP config in VRF 0
# Should now drop requests.
#
self.vapi.dhcp_proxy_config(server_addr,
src_addr,
rx_table_id=0,
is_add=0)
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_ip4n
src_addr1 = self.pg1.local_ip4n
self.vapi.dhcp_proxy_config(server_addr1,
src_addr1,
rx_table_id=1,
server_table_id=1)
server_addr2 = self.pg2.remote_ip4n
src_addr2 = self.pg2.local_ip4n
self.vapi.dhcp_proxy_config(server_addr2,
src_addr2,
rx_table_id=2,
server_table_id=2)
#
# 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(1, 1, vpn_index=1, oui=4, is_add=1)
self.vapi.dhcp_proxy_set_vss(2, 0, "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 = socket.inet_pton(AF_INET, self.pg1.remote_hosts[1].ip4)
self.vapi.dhcp_proxy_config(server_addr12,
src_addr1,
rx_table_id=1,
server_table_id=1,
is_add=1)
#
# 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
#
self.vapi.dhcp_proxy_config(server_addr12,
src_addr1,
rx_table_id=1,
server_table_id=1,
is_add=0)
#
# 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(1, is_add=0)
self.vapi.dhcp_proxy_set_vss(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
#
self.vapi.dhcp_proxy_config(server_addr1,
src_addr1,
rx_table_id=1,
server_table_id=1,
is_add=0)
self.vapi.dhcp_proxy_config(server_addr2,
src_addr2,
rx_table_id=2,
server_table_id=2,
is_add=0)
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_ip6n
src_addr_vrf0 = self.pg0.local_ip6n
server_addr_vrf1 = self.pg1.remote_ip6n
src_addr_vrf1 = self.pg1.local_ip6n
server_addr_vrf2 = self.pg2.remote_ip6n
src_addr_vrf2 = self.pg2.local_ip6n
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
#
self.vapi.dhcp_proxy_config(server_addr_vrf0,
src_addr_vrf0,
rx_table_id=0,
server_table_id=0,
is_ipv6=1)
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
#
self.vapi.dhcp_proxy_config(server_addr_vrf1,
src_addr_vrf1,
rx_table_id=1,
server_table_id=1,
is_ipv6=1)
self.pg4.config_ip6()
self.vapi.dhcp_proxy_config(server_addr_vrf2,
src_addr_vrf2,
rx_table_id=2,
server_table_id=2,
is_ipv6=1)
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
# table=1, vss_type=1, vpn_index=1, oui=4
# table=2, vss_type=0, vpn_id = "ip6-table-2"
self.vapi.dhcp_proxy_set_vss(1, 1, oui=4, vpn_index=1, is_ip6=1)
self.vapi.dhcp_proxy_set_vss(2, 0, "IPv6-table-2", is_ip6=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(1, is_ip6=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 = socket.inet_pton(AF_INET6,
self.pg1.remote_hosts[1].ip6)
self.vapi.dhcp_proxy_config(server_addr12,
src_addr_vrf1,
rx_table_id=1,
server_table_id=1,
is_ipv6=1)
#
# 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,
af=AF_INET6)
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
#
self.vapi.dhcp_proxy_config(server_addr12,
src_addr_vrf1,
rx_table_id=1,
server_table_id=1,
is_ipv6=1,
is_add=0)
#
# 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
#
self.vapi.dhcp_proxy_config(server_addr_vrf2,
src_addr_vrf2,
rx_table_id=2,
server_table_id=2,
is_ipv6=1,
is_add=0)
self.vapi.dhcp_proxy_config(server_addr_vrf1,
src_addr_vrf1,
rx_table_id=1,
server_table_id=1,
is_ipv6=1,
is_add=0)
self.vapi.dhcp_proxy_config(server_addr_vrf0,
src_addr_vrf0,
rx_table_id=0,
server_table_id=0,
is_ipv6=1,
is_add=0)
# duplicate delete
self.vapi.dhcp_proxy_config(server_addr_vrf0,
src_addr_vrf0,
rx_table_id=0,
server_table_id=0,
is_ipv6=1,
is_add=0)
self.pg3.unconfig_ip6()
self.pg4.unconfig_ip6()
self.pg5.unconfig_ip6()
def test_dhcp_client(self):
""" DHCP Client"""
hostname = 'universal-dp'
self.pg_enable_capture(self.pg_interfaces)
#
# Configure DHCP client on PG3 and capture the discover sent
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname)
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,
mac_pton(self.pg3.remote_mac),
self.pg3.remote_ip4,
is_add=0)
#
# remove the DHCP config
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname, is_add=0)
#
# 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
#
self.pg3.admin_down()
self.sleep(1)
self.pg3.admin_up()
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname,
client_id=self.pg3.local_mac)
rx = self.pg3.get_capture(1)
self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname,
self.pg3.local_mac)
# 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)
#
# 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
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname, is_add=0)
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
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname,
set_broadcast_flag=0)
rx = self.pg3.get_capture(1)
self.verify_orig_dhcp_discover(rx[0], self.pg3, hostname,
broadcast=0)
#
# 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=0)
#
# Send an acknowledgment
#
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, 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,
mac_pton(self.pg3.remote_mac),
self.pg3.remote_ip4,
is_add=0)
#
# 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)
self.assertEqual(clients[0].lease.is_ipv6, 0)
# 0 = DISCOVER, 1 = REQUEST, 2 = BOUND
self.assertEqual(clients[0].lease.state, 2)
self.assertEqual(clients[0].lease.mask_width, 24)
self.assertEqual(clients[0].lease.router_address.rstrip('\0'),
self.pg3.remote_ip4n)
self.assertEqual(clients[0].lease.host_address.rstrip('\0'),
self.pg3.local_ip4n)
#
# remove the DHCP config
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname, is_add=0)
#
# 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.
#
self.pg3.admin_down()
self.sleep(1)
self.pg3.admin_up()
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname)
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,
mac_pton(self.pg3.remote_mac),
self.pg3.remote_ip4,
is_add=0)
#
# Sleep for the lease time
#
self.sleep(lease_time+1)
#
# 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))
#
# remove the DHCP config
#
self.vapi.dhcp_client(self.pg3.sw_if_index, hostname, is_add=0)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
