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test_dhcp.py
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test_dhcp.py
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#!/usr/bin/env python3
import unittest
import socket
import struct
import six
from framework import VppTestCase, VppTestRunner
from framework import 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, getmacbyip, ARP, Dot1Q
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6, in6_getnsmac
from scapy.utils6 import in6_mactoifaceid
from scapy.layers.dhcp import DHCP, BOOTP, DHCPTypes
from scapy.layers.dhcp6 import (
DHCP6,
DHCP6_Solicit,
DHCP6_RelayForward,
DHCP6_RelayReply,
DHCP6_Advertise,
DHCP6OptRelayMsg,
DHCP6OptIfaceId,
DHCP6OptStatusCode,
DHCP6OptVSS,
DHCP6OptClientLinkLayerAddr,
DHCP6_Request,
)
from socket import AF_INET, AF_INET6, inet_pton, inet_ntop
from scapy.utils6 import in6_ptop
from vpp_papi import mac_pton, VppEnum
from vpp_sub_interface import VppDot1QSubint
from vpp_qos import VppQosEgressMap, VppQosMark
from vpp_dhcp import VppDHCPClient, VppDHCPProxy
DHCP4_CLIENT_PORT = 68
DHCP4_SERVER_PORT = 67
DHCP6_CLIENT_PORT = 547
DHCP6_SERVER_PORT = 546
@tag_run_solo
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)
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)