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vpp/test/test_nat44_ed.py
Klement Sekera 79699b00c1 nat: don't drop packet with ttl=1 if output feature 
TTL was already decremented in ip4-rewrite so it's okay if it's 1.

Type: fix
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I587dc343737c15247eb62837a06d5e44c0d11acc
2021-06-22 13:23:38 +00:00

3784 lines
147 KiB
Python
Raw Blame History

#!/usr/bin/env python3
import unittest
from io import BytesIO
from random import randint, shuffle, choice
import scapy.compat
from framework import VppTestCase, VppTestRunner
from scapy.data import IP_PROTOS
from scapy.layers.inet import IP, TCP, UDP, ICMP, GRE
from scapy.layers.inet import IPerror, TCPerror
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from syslog_rfc5424_parser import SyslogMessage, ParseError
from syslog_rfc5424_parser.constants import SyslogSeverity
from util import ppp, ip4_range
from vpp_acl import AclRule, VppAcl, VppAclInterface
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_papi import VppEnum
class NAT44EDTestCase(VppTestCase):
nat_addr = '10.0.0.3'
tcp_port_in = 6303
tcp_port_out = 6303
udp_port_in = 6304
udp_port_out = 6304
icmp_id_in = 6305
icmp_id_out = 6305
tcp_external_port = 80
max_sessions = 100
def setUp(self):
super(NAT44EDTestCase, self).setUp()
self.plugin_enable()
def tearDown(self):
super(NAT44EDTestCase, self).tearDown()
if not self.vpp_dead:
self.plugin_disable()
def plugin_enable(self):
self.vapi.nat44_ed_plugin_enable_disable(
sessions=self.max_sessions, enable=1)
def plugin_disable(self):
self.vapi.nat44_ed_plugin_enable_disable(enable=0)
@property
def config_flags(self):
return VppEnum.vl_api_nat_config_flags_t
@property
def nat44_config_flags(self):
return VppEnum.vl_api_nat44_config_flags_t
@property
def syslog_severity(self):
return VppEnum.vl_api_syslog_severity_t
@property
def server_addr(self):
return self.pg1.remote_hosts[0].ip4
@staticmethod
def random_port():
return randint(1025, 65535)
@staticmethod
def proto2layer(proto):
if proto == IP_PROTOS.tcp:
return TCP
elif proto == IP_PROTOS.udp:
return UDP
elif proto == IP_PROTOS.icmp:
return ICMP
else:
raise Exception("Unsupported protocol")
@classmethod
def create_and_add_ip4_table(cls, i, table_id=0):
cls.vapi.ip_table_add_del(is_add=1, table={'table_id': table_id})
i.set_table_ip4(table_id)
@classmethod
def configure_ip4_interface(cls, i, hosts=0, table_id=None):
if table_id:
cls.create_and_add_ip4_table(i, table_id)
i.admin_up()
i.config_ip4()
i.resolve_arp()
if hosts:
i.generate_remote_hosts(hosts)
i.configure_ipv4_neighbors()
@classmethod
def nat_add_interface_address(cls, i):
cls.vapi.nat44_add_del_interface_addr(
sw_if_index=i.sw_if_index, is_add=1)
def nat_add_inside_interface(self, i):
self.vapi.nat44_interface_add_del_feature(
flags=self.config_flags.NAT_IS_INSIDE,
sw_if_index=i.sw_if_index, is_add=1)
def nat_add_outside_interface(self, i):
self.vapi.nat44_interface_add_del_feature(
flags=self.config_flags.NAT_IS_OUTSIDE,
sw_if_index=i.sw_if_index, is_add=1)
def nat_add_address(self, address, twice_nat=0,
vrf_id=0xFFFFFFFF, is_add=1):
flags = self.config_flags.NAT_IS_TWICE_NAT if twice_nat else 0
self.vapi.nat44_add_del_address_range(first_ip_address=address,
last_ip_address=address,
vrf_id=vrf_id,
is_add=is_add,
flags=flags)
def nat_add_static_mapping(self, local_ip, external_ip='0.0.0.0',
local_port=0, external_port=0, vrf_id=0,
is_add=1, external_sw_if_index=0xFFFFFFFF,
proto=0, tag="", flags=0):
if not (local_port and external_port):
flags |= self.config_flags.NAT_IS_ADDR_ONLY
self.vapi.nat44_add_del_static_mapping(
is_add=is_add,
local_ip_address=local_ip,
external_ip_address=external_ip,
external_sw_if_index=external_sw_if_index,
local_port=local_port,
external_port=external_port,
vrf_id=vrf_id, protocol=proto,
flags=flags,
tag=tag)
@classmethod
def setUpClass(cls):
super(NAT44EDTestCase, cls).setUpClass()
cls.create_pg_interfaces(range(12))
cls.interfaces = list(cls.pg_interfaces[:4])
cls.create_and_add_ip4_table(cls.pg2, 10)
for i in cls.interfaces:
cls.configure_ip4_interface(i, hosts=3)
# test specific (test-multiple-vrf)
cls.vapi.ip_table_add_del(is_add=1, table={'table_id': 1})
# test specific (test-one-armed-nat44-static)
cls.pg4.generate_remote_hosts(2)
cls.pg4.config_ip4()
cls.vapi.sw_interface_add_del_address(
sw_if_index=cls.pg4.sw_if_index,
prefix="10.0.0.1/24")
cls.pg4.admin_up()
cls.pg4.resolve_arp()
cls.pg4._remote_hosts[1]._ip4 = cls.pg4._remote_hosts[0]._ip4
cls.pg4.resolve_arp()
# test specific interface (pg5)
cls.pg5._local_ip4 = "10.1.1.1"
cls.pg5._remote_hosts[0]._ip4 = "10.1.1.2"
cls.pg5.set_table_ip4(1)
cls.pg5.config_ip4()
cls.pg5.admin_up()
cls.pg5.resolve_arp()
# test specific interface (pg6)
cls.pg6._local_ip4 = "10.1.2.1"
cls.pg6._remote_hosts[0]._ip4 = "10.1.2.2"
cls.pg6.set_table_ip4(1)
cls.pg6.config_ip4()
cls.pg6.admin_up()
cls.pg6.resolve_arp()
rl = list()
rl.append(VppIpRoute(cls, "0.0.0.0", 0,
[VppRoutePath("0.0.0.0", 0xffffffff,
nh_table_id=0)],
register=False, table_id=1))
rl.append(VppIpRoute(cls, "0.0.0.0", 0,
[VppRoutePath(cls.pg1.local_ip4,
cls.pg1.sw_if_index)],
register=False))
rl.append(VppIpRoute(cls, cls.pg5.remote_ip4, 32,
[VppRoutePath("0.0.0.0",
cls.pg5.sw_if_index)],
register=False, table_id=1))
rl.append(VppIpRoute(cls, cls.pg6.remote_ip4, 32,
[VppRoutePath("0.0.0.0",
cls.pg6.sw_if_index)],
register=False, table_id=1))
rl.append(VppIpRoute(cls, cls.pg6.remote_ip4, 16,
[VppRoutePath("0.0.0.0", 0xffffffff,
nh_table_id=1)],
register=False, table_id=0))
for r in rl:
r.add_vpp_config()
def get_err_counter(self, path):
return self.statistics.get_err_counter(path)
def reass_hairpinning(self, server_addr, server_in_port, server_out_port,
host_in_port, proto=IP_PROTOS.tcp,
ignore_port=False):
layer = self.proto2layer(proto)
if proto == IP_PROTOS.tcp:
data = b"A" * 4 + b"B" * 16 + b"C" * 3
else:
data = b"A" * 16 + b"B" * 16 + b"C" * 3
# send packet from host to server
pkts = self.create_stream_frag(self.pg0,
self.nat_addr,
host_in_port,
server_out_port,
data,
proto)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg0.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
self.nat_addr,
server_addr)
if proto != IP_PROTOS.icmp:
if not ignore_port:
self.assertNotEqual(p[layer].sport, host_in_port)
self.assertEqual(p[layer].dport, server_in_port)
else:
if not ignore_port:
self.assertNotEqual(p[layer].id, host_in_port)
self.assertEqual(data, p[Raw].load)
def frag_out_of_order(self, proto=IP_PROTOS.tcp, dont_translate=False,
ignore_port=False):
layer = self.proto2layer(proto)
if proto == IP_PROTOS.tcp:
data = b"A" * 4 + b"B" * 16 + b"C" * 3
else:
data = b"A" * 16 + b"B" * 16 + b"C" * 3
self.port_in = self.random_port()
for i in range(2):
# in2out
pkts = self.create_stream_frag(self.pg0, self.pg1.remote_ip4,
self.port_in, 20, data, proto)
pkts.reverse()
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg1.get_capture(len(pkts))
if not dont_translate:
p = self.reass_frags_and_verify(frags,
self.nat_addr,
self.pg1.remote_ip4)
else:
p = self.reass_frags_and_verify(frags,
self.pg0.remote_ip4,
self.pg1.remote_ip4)
if proto != IP_PROTOS.icmp:
if not dont_translate:
self.assertEqual(p[layer].dport, 20)
if not ignore_port:
self.assertNotEqual(p[layer].sport, self.port_in)
else:
self.assertEqual(p[layer].sport, self.port_in)
else:
if not ignore_port:
if not dont_translate:
self.assertNotEqual(p[layer].id, self.port_in)
else:
self.assertEqual(p[layer].id, self.port_in)
self.assertEqual(data, p[Raw].load)
# out2in
if not dont_translate:
dst_addr = self.nat_addr
else:
dst_addr = self.pg0.remote_ip4
if proto != IP_PROTOS.icmp:
sport = 20
dport = p[layer].sport
else:
sport = p[layer].id
dport = 0
pkts = self.create_stream_frag(self.pg1, dst_addr, sport, dport,
data, proto, echo_reply=True)
pkts.reverse()
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.logger.info(self.vapi.cli("show trace"))
self.pg_start()
frags = self.pg0.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
self.pg1.remote_ip4,
self.pg0.remote_ip4)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].sport, 20)
self.assertEqual(p[layer].dport, self.port_in)
else:
self.assertEqual(p[layer].id, self.port_in)
self.assertEqual(data, p[Raw].load)
def reass_frags_and_verify(self, frags, src, dst):
buffer = BytesIO()
for p in frags:
self.assertEqual(p[IP].src, src)
self.assertEqual(p[IP].dst, dst)
self.assert_ip_checksum_valid(p)
buffer.seek(p[IP].frag * 8)
buffer.write(bytes(p[IP].payload))
ip = IP(src=frags[0][IP].src, dst=frags[0][IP].dst,
proto=frags[0][IP].proto)
if ip.proto == IP_PROTOS.tcp:
p = (ip / TCP(buffer.getvalue()))
self.logger.debug(ppp("Reassembled:", p))
self.assert_tcp_checksum_valid(p)
elif ip.proto == IP_PROTOS.udp:
p = (ip / UDP(buffer.getvalue()[:8]) /
Raw(buffer.getvalue()[8:]))
elif ip.proto == IP_PROTOS.icmp:
p = (ip / ICMP(buffer.getvalue()))
return p
def frag_in_order(self, proto=IP_PROTOS.tcp, dont_translate=False,
ignore_port=False):
layer = self.proto2layer(proto)
if proto == IP_PROTOS.tcp:
data = b"A" * 4 + b"B" * 16 + b"C" * 3
else:
data = b"A" * 16 + b"B" * 16 + b"C" * 3
self.port_in = self.random_port()
# in2out
pkts = self.create_stream_frag(self.pg0, self.pg1.remote_ip4,
self.port_in, 20, data, proto)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg1.get_capture(len(pkts))
if not dont_translate:
p = self.reass_frags_and_verify(frags,
self.nat_addr,
self.pg1.remote_ip4)
else:
p = self.reass_frags_and_verify(frags,
self.pg0.remote_ip4,
self.pg1.remote_ip4)
if proto != IP_PROTOS.icmp:
if not dont_translate:
self.assertEqual(p[layer].dport, 20)
if not ignore_port:
self.assertNotEqual(p[layer].sport, self.port_in)
else:
self.assertEqual(p[layer].sport, self.port_in)
else:
if not ignore_port:
if not dont_translate:
self.assertNotEqual(p[layer].id, self.port_in)
else:
self.assertEqual(p[layer].id, self.port_in)
self.assertEqual(data, p[Raw].load)
# out2in
if not dont_translate:
dst_addr = self.nat_addr
else:
dst_addr = self.pg0.remote_ip4
if proto != IP_PROTOS.icmp:
sport = 20
dport = p[layer].sport
else:
sport = p[layer].id
dport = 0
pkts = self.create_stream_frag(self.pg1, dst_addr, sport, dport, data,
proto, echo_reply=True)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg0.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
self.pg1.remote_ip4,
self.pg0.remote_ip4)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].sport, 20)
self.assertEqual(p[layer].dport, self.port_in)
else:
self.assertEqual(p[layer].id, self.port_in)
self.assertEqual(data, p[Raw].load)
def verify_capture_out(self, capture, nat_ip=None, same_port=False,
dst_ip=None, ignore_port=False):
if nat_ip is None:
nat_ip = self.nat_addr
for packet in capture:
try:
self.assert_packet_checksums_valid(packet)
self.assertEqual(packet[IP].src, nat_ip)
if dst_ip is not None:
self.assertEqual(packet[IP].dst, dst_ip)
if packet.haslayer(TCP):
if not ignore_port:
if same_port:
self.assertEqual(
packet[TCP].sport, self.tcp_port_in)
else:
self.assertNotEqual(
packet[TCP].sport, self.tcp_port_in)
self.tcp_port_out = packet[TCP].sport
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
if not ignore_port:
if same_port:
self.assertEqual(
packet[UDP].sport, self.udp_port_in)
else:
self.assertNotEqual(
packet[UDP].sport, self.udp_port_in)
self.udp_port_out = packet[UDP].sport
else:
if not ignore_port:
if same_port:
self.assertEqual(
packet[ICMP].id, self.icmp_id_in)
else:
self.assertNotEqual(
packet[ICMP].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP].id
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet "
"(outside network):", packet))
raise
def verify_capture_in(self, capture, in_if):
for packet in capture:
try:
self.assert_packet_checksums_valid(packet)
self.assertEqual(packet[IP].dst, in_if.remote_ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].dport, self.tcp_port_in)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].dport, self.udp_port_in)
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
except:
self.logger.error(ppp("Unexpected or invalid packet "
"(inside network):", packet))
raise
def create_stream_in(self, in_if, out_if, dst_ip=None, ttl=64):
if dst_ip is None:
dst_ip = out_if.remote_ip4
pkts = []
# TCP
p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
TCP(sport=self.tcp_port_in, dport=20))
pkts.extend([p, p])
# UDP
p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
UDP(sport=self.udp_port_in, dport=20))
pkts.append(p)
# ICMP
p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
ICMP(id=self.icmp_id_in, type='echo-request'))
pkts.append(p)
return pkts
def create_stream_out(self, out_if, dst_ip=None, ttl=64,
use_inside_ports=False):
if dst_ip is None:
dst_ip = self.nat_addr
if not use_inside_ports:
tcp_port = self.tcp_port_out
udp_port = self.udp_port_out
icmp_id = self.icmp_id_out
else:
tcp_port = self.tcp_port_in
udp_port = self.udp_port_in
icmp_id = self.icmp_id_in
pkts = []
# TCP
p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
TCP(dport=tcp_port, sport=20))
pkts.extend([p, p])
# UDP
p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
UDP(dport=udp_port, sport=20))
pkts.append(p)
# ICMP
p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
ICMP(id=icmp_id, type='echo-reply'))
pkts.append(p)
return pkts
def create_tcp_stream(self, in_if, out_if, count):
pkts = []
port = 6303
for i in range(count):
p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=64) /
TCP(sport=port + i, dport=20))
pkts.append(p)
return pkts
def create_stream_frag(self, src_if, dst, sport, dport, data,
proto=IP_PROTOS.tcp, echo_reply=False):
if proto == IP_PROTOS.tcp:
p = (IP(src=src_if.remote_ip4, dst=dst) /
TCP(sport=sport, dport=dport) /
Raw(data))
p = p.__class__(scapy.compat.raw(p))
chksum = p[TCP].chksum
proto_header = TCP(sport=sport, dport=dport, chksum=chksum)
elif proto == IP_PROTOS.udp:
proto_header = UDP(sport=sport, dport=dport)
elif proto == IP_PROTOS.icmp:
if not echo_reply:
proto_header = ICMP(id=sport, type='echo-request')
else:
proto_header = ICMP(id=sport, type='echo-reply')
else:
raise Exception("Unsupported protocol")
id = self.random_port()
pkts = []
if proto == IP_PROTOS.tcp:
raw = Raw(data[0:4])
else:
raw = Raw(data[0:16])
p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
IP(src=src_if.remote_ip4, dst=dst, flags="MF", frag=0, id=id) /
proto_header /
raw)
pkts.append(p)
if proto == IP_PROTOS.tcp:
raw = Raw(data[4:20])
else:
raw = Raw(data[16:32])
p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
IP(src=src_if.remote_ip4, dst=dst, flags="MF", frag=3, id=id,
proto=proto) /
raw)
pkts.append(p)
if proto == IP_PROTOS.tcp:
raw = Raw(data[20:])
else:
raw = Raw(data[32:])
p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
IP(src=src_if.remote_ip4, dst=dst, frag=5, proto=proto,
id=id) /
raw)
pkts.append(p)
return pkts
def frag_in_order_in_plus_out(self, in_addr, out_addr, in_port, out_port,
proto=IP_PROTOS.tcp):
layer = self.proto2layer(proto)
if proto == IP_PROTOS.tcp:
data = b"A" * 4 + b"B" * 16 + b"C" * 3
else:
data = b"A" * 16 + b"B" * 16 + b"C" * 3
port_in = self.random_port()
for i in range(2):
# out2in
pkts = self.create_stream_frag(self.pg0, out_addr,
port_in, out_port,
data, proto)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg1.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
self.pg0.remote_ip4,
in_addr)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].sport, port_in)
self.assertEqual(p[layer].dport, in_port)
else:
self.assertEqual(p[layer].id, port_in)
self.assertEqual(data, p[Raw].load)
# in2out
if proto != IP_PROTOS.icmp:
pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
in_port,
p[layer].sport, data, proto)
else:
pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
p[layer].id, 0, data, proto,
echo_reply=True)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg0.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
out_addr,
self.pg0.remote_ip4)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].sport, out_port)
self.assertEqual(p[layer].dport, port_in)
else:
self.assertEqual(p[layer].id, port_in)
self.assertEqual(data, p[Raw].load)
def frag_out_of_order_in_plus_out(self, in_addr, out_addr, in_port,
out_port, proto=IP_PROTOS.tcp):
layer = self.proto2layer(proto)
if proto == IP_PROTOS.tcp:
data = b"A" * 4 + b"B" * 16 + b"C" * 3
else:
data = b"A" * 16 + b"B" * 16 + b"C" * 3
port_in = self.random_port()
for i in range(2):
# out2in
pkts = self.create_stream_frag(self.pg0, out_addr,
port_in, out_port,
data, proto)
pkts.reverse()
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg1.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
self.pg0.remote_ip4,
in_addr)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].dport, in_port)
self.assertEqual(p[layer].sport, port_in)
self.assertEqual(p[layer].dport, in_port)
else:
self.assertEqual(p[layer].id, port_in)
self.assertEqual(data, p[Raw].load)
# in2out
if proto != IP_PROTOS.icmp:
pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
in_port,
p[layer].sport, data, proto)
else:
pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
p[layer].id, 0, data, proto,
echo_reply=True)
pkts.reverse()
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
frags = self.pg0.get_capture(len(pkts))
p = self.reass_frags_and_verify(frags,
out_addr,
self.pg0.remote_ip4)
if proto != IP_PROTOS.icmp:
self.assertEqual(p[layer].sport, out_port)
self.assertEqual(p[layer].dport, port_in)
else:
self.assertEqual(p[layer].id, port_in)
self.assertEqual(data, p[Raw].load)
def init_tcp_session(self, in_if, out_if, in_port, ext_port):
# SYN packet in->out
p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
TCP(sport=in_port, dport=ext_port, flags="S"))
in_if.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = out_if.get_capture(1)
p = capture[0]
out_port = p[TCP].sport
# SYN + ACK packet out->in
p = (Ether(src=out_if.remote_mac, dst=out_if.local_mac) /
IP(src=out_if.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port, flags="SA"))
out_if.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
in_if.get_capture(1)
# ACK packet in->out
p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
TCP(sport=in_port, dport=ext_port, flags="A"))
in_if.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
out_if.get_capture(1)
return out_port
def twice_nat_common(self, self_twice_nat=False, same_pg=False, lb=False,
client_id=None):
twice_nat_addr = '10.0.1.3'
port_in = 8080
if lb:
if not same_pg:
port_in1 = port_in
port_in2 = port_in
else:
port_in1 = port_in + 1
port_in2 = port_in + 2
port_out = 80
eh_port_out = 4567
server1 = self.pg0.remote_hosts[0]
server2 = self.pg0.remote_hosts[1]
if lb and same_pg:
server2 = server1
if not lb:
server = server1
pg0 = self.pg0
if same_pg:
pg1 = self.pg0
else:
pg1 = self.pg1
eh_translate = ((not self_twice_nat) or (not lb and same_pg) or
client_id == 1)
self.nat_add_address(self.nat_addr)
self.nat_add_address(twice_nat_addr, twice_nat=1)
flags = 0
if self_twice_nat:
flags |= self.config_flags.NAT_IS_SELF_TWICE_NAT
else:
flags |= self.config_flags.NAT_IS_TWICE_NAT
if not lb:
self.nat_add_static_mapping(pg0.remote_ip4, self.nat_addr,
port_in, port_out,
proto=IP_PROTOS.tcp,
flags=flags)
else:
locals = [{'addr': server1.ip4,
'port': port_in1,
'probability': 50,
'vrf_id': 0},
{'addr': server2.ip4,
'port': port_in2,
'probability': 50,
'vrf_id': 0}]
out_addr = self.nat_addr
self.vapi.nat44_add_del_lb_static_mapping(is_add=1, flags=flags,
external_addr=out_addr,
external_port=port_out,
protocol=IP_PROTOS.tcp,
local_num=len(locals),
locals=locals)
self.nat_add_inside_interface(pg0)
self.nat_add_outside_interface(pg1)
if same_pg:
if not lb:
client = server
else:
assert client_id is not None
if client_id == 1:
client = self.pg0.remote_hosts[0]
elif client_id == 2:
client = self.pg0.remote_hosts[1]
else:
client = pg1.remote_hosts[0]
p = (Ether(src=pg1.remote_mac, dst=pg1.local_mac) /
IP(src=client.ip4, dst=self.nat_addr) /
TCP(sport=eh_port_out, dport=port_out))
pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
if lb:
if ip.dst == server1.ip4:
server = server1
port_in = port_in1
else:
server = server2
port_in = port_in2
self.assertEqual(ip.dst, server.ip4)
if lb and same_pg:
self.assertIn(tcp.dport, [port_in1, port_in2])
else:
self.assertEqual(tcp.dport, port_in)
if eh_translate:
self.assertEqual(ip.src, twice_nat_addr)
self.assertNotEqual(tcp.sport, eh_port_out)
else:
self.assertEqual(ip.src, client.ip4)
self.assertEqual(tcp.sport, eh_port_out)
eh_addr_in = ip.src
eh_port_in = tcp.sport
saved_port_in = tcp.dport
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
p = (Ether(src=server.mac, dst=pg0.local_mac) /
IP(src=server.ip4, dst=eh_addr_in) /
TCP(sport=saved_port_in, dport=eh_port_in))
pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, client.ip4)
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.dport, eh_port_out)
self.assertEqual(tcp.sport, port_out)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
if eh_translate:
sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
self.assertEqual(len(sessions), 1)
self.assertTrue(sessions[0].flags &
self.config_flags.NAT_IS_EXT_HOST_VALID)
self.assertTrue(sessions[0].flags &
self.config_flags.NAT_IS_TWICE_NAT)
self.logger.info(self.vapi.cli("show nat44 sessions"))
self.vapi.nat44_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=(self.config_flags.NAT_IS_INSIDE |
self.config_flags.NAT_IS_EXT_HOST_VALID),
ext_host_address=sessions[0].ext_host_nat_address,
ext_host_port=sessions[0].ext_host_nat_port)
sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
self.assertEqual(len(sessions), 0)
def verify_syslog_sess(self, data, is_add=True, is_ip6=False):
message = data.decode('utf-8')
try:
message = SyslogMessage.parse(message)
except ParseError as e:
self.logger.error(e)
raise
else:
self.assertEqual(message.severity, SyslogSeverity.info)
self.assertEqual(message.appname, 'NAT')
self.assertEqual(message.msgid, 'SADD' if is_add else 'SDEL')
sd_params = message.sd.get('nsess')
self.assertTrue(sd_params is not None)
if is_ip6:
self.assertEqual(sd_params.get('IATYP'), 'IPv6')
self.assertEqual(sd_params.get('ISADDR'), self.pg0.remote_ip6)
else:
self.assertEqual(sd_params.get('IATYP'), 'IPv4')
self.assertEqual(sd_params.get('ISADDR'), self.pg0.remote_ip4)
self.assertTrue(sd_params.get('SSUBIX') is not None)
self.assertEqual(sd_params.get('ISPORT'), "%d" % self.tcp_port_in)
self.assertEqual(sd_params.get('XATYP'), 'IPv4')
self.assertEqual(sd_params.get('XSADDR'), self.nat_addr)
self.assertEqual(sd_params.get('XSPORT'), "%d" % self.tcp_port_out)
self.assertEqual(sd_params.get('PROTO'), "%d" % IP_PROTOS.tcp)
self.assertEqual(sd_params.get('SVLAN'), '0')
self.assertEqual(sd_params.get('XDADDR'), self.pg1.remote_ip4)
self.assertEqual(sd_params.get('XDPORT'),
"%d" % self.tcp_external_port)
class TestNAT44ED(NAT44EDTestCase):
""" NAT44ED Test Case """
def test_users_dump(self):
""" NAT44ED API test - nat44_user_dump """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat44_forwarding_enable_disable(enable=1)
local_ip = self.pg0.remote_ip4
external_ip = self.nat_addr
self.nat_add_static_mapping(local_ip, external_ip)
users = self.vapi.nat44_user_dump()
self.assertEqual(len(users), 0)
# in2out - static mapping match
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, same_port=True)
users = self.vapi.nat44_user_dump()
self.assertEqual(len(users), 1)
static_user = users[0]
self.assertEqual(static_user.nstaticsessions, 3)
self.assertEqual(static_user.nsessions, 0)
# in2out - no static mapping match (forwarding test)
host0 = self.pg0.remote_hosts[0]
self.pg0.remote_hosts[0] = self.pg0.remote_hosts[1]
try:
pkts = self.create_stream_out(self.pg1,
dst_ip=self.pg0.remote_ip4,
use_inside_ports=True)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
same_port=True)
finally:
self.pg0.remote_hosts[0] = host0
users = self.vapi.nat44_user_dump()
self.assertEqual(len(users), 2)
if str(users[0].ip_address) == self.pg0.remote_hosts[0].ip4:
non_static_user = users[1]
static_user = users[0]
else:
non_static_user = users[0]
static_user = users[1]
self.assertEqual(static_user.nstaticsessions, 3)
self.assertEqual(static_user.nsessions, 0)
self.assertEqual(non_static_user.nstaticsessions, 0)
self.assertEqual(non_static_user.nsessions, 3)
users = self.vapi.nat44_user_dump()
self.assertEqual(len(users), 2)
if str(users[0].ip_address) == self.pg0.remote_hosts[0].ip4:
non_static_user = users[1]
static_user = users[0]
else:
non_static_user = users[0]
static_user = users[1]
self.assertEqual(static_user.nstaticsessions, 3)
self.assertEqual(static_user.nsessions, 0)
self.assertEqual(non_static_user.nstaticsessions, 0)
self.assertEqual(non_static_user.nsessions, 3)
def test_frag_out_of_order_do_not_translate(self):
""" NAT44ED don't translate fragments arriving out of order """
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat44_forwarding_enable_disable(enable=True)
self.frag_out_of_order(proto=IP_PROTOS.tcp, dont_translate=True)
def test_forwarding(self):
""" NAT44ED forwarding test """
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat44_forwarding_enable_disable(enable=1)
real_ip = self.pg0.remote_ip4
alias_ip = self.nat_addr
flags = self.config_flags.NAT_IS_ADDR_ONLY
self.vapi.nat44_add_del_static_mapping(is_add=1,
local_ip_address=real_ip,
external_ip_address=alias_ip,
external_sw_if_index=0xFFFFFFFF,
flags=flags)
try:
# in2out - static mapping match
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, same_port=True)
# in2out - no static mapping match
host0 = self.pg0.remote_hosts[0]
self.pg0.remote_hosts[0] = self.pg0.remote_hosts[1]
try:
pkts = self.create_stream_out(self.pg1,
dst_ip=self.pg0.remote_ip4,
use_inside_ports=True)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
same_port=True)
finally:
self.pg0.remote_hosts[0] = host0
user = self.pg0.remote_hosts[1]
sessions = self.vapi.nat44_user_session_dump(user.ip4, 0)
self.assertEqual(len(sessions), 3)
self.assertTrue(sessions[0].flags &
self.config_flags.NAT_IS_EXT_HOST_VALID)
self.vapi.nat44_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=(self.config_flags.NAT_IS_INSIDE |
self.config_flags.NAT_IS_EXT_HOST_VALID),
ext_host_address=sessions[0].ext_host_address,
ext_host_port=sessions[0].ext_host_port)
sessions = self.vapi.nat44_user_session_dump(user.ip4, 0)
self.assertEqual(len(sessions), 2)
finally:
self.vapi.nat44_forwarding_enable_disable(enable=0)
flags = self.config_flags.NAT_IS_ADDR_ONLY
self.vapi.nat44_add_del_static_mapping(
is_add=0,
local_ip_address=real_ip,
external_ip_address=alias_ip,
external_sw_if_index=0xFFFFFFFF,
flags=flags)
def test_output_feature_and_service2(self):
""" NAT44ED interface output feature and service host direct access """
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.nat_addr)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1,)
# session initiated from service host - translate
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# session initiated from remote host - do not translate
tcp_port_in = self.tcp_port_in
udp_port_in = self.udp_port_in
icmp_id_in = self.icmp_id_in
self.tcp_port_in = 60303
self.udp_port_in = 60304
self.icmp_id_in = 60305
try:
pkts = self.create_stream_out(self.pg1,
self.pg0.remote_ip4,
use_inside_ports=True)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
same_port=True)
finally:
self.tcp_port_in = tcp_port_in
self.udp_port_in = udp_port_in
self.icmp_id_in = icmp_id_in
def test_twice_nat(self):
""" NAT44ED Twice NAT """
self.twice_nat_common()
def test_self_twice_nat_positive(self):
""" NAT44ED Self Twice NAT (positive test) """
self.twice_nat_common(self_twice_nat=True, same_pg=True)
def test_self_twice_nat_lb_positive(self):
""" NAT44ED Self Twice NAT local service load balancing (positive test)
"""
self.twice_nat_common(lb=True, self_twice_nat=True, same_pg=True,
client_id=1)
def test_twice_nat_lb(self):
""" NAT44ED Twice NAT local service load balancing """
self.twice_nat_common(lb=True)
def test_output_feature(self):
""" NAT44ED interface output feature (in2out postrouting) """
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.nat_addr)
self.nat_add_outside_interface(self.pg0)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
# out2in
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1, ttl=2)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
# out2in
pkts = self.create_stream_out(self.pg1, ttl=2)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1, ttl=1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for p in capture:
self.assertIn(ICMP, p)
self.assertEqual(p[ICMP].type, 11) # 11 == time-exceeded
def test_static_with_port_out2(self):
""" NAT44ED 1:1 NAPT asymmetrical rule """
external_port = 80
local_port = 8080
self.vapi.nat44_forwarding_enable_disable(enable=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
local_port, external_port,
proto=IP_PROTOS.tcp, flags=flags)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# from client to service
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=12345, dport=external_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# ICMP error
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
ICMP(type=11) / capture[0][IP])
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
self.assertEqual(p[IP].src, self.nat_addr)
inner = p[IPerror]
self.assertEqual(inner.dst, self.nat_addr)
self.assertEqual(inner[TCPerror].dport, external_port)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# ICMP error
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
ICMP(type=11) / capture[0][IP])
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
self.assertEqual(p[IP].dst, self.pg0.remote_ip4)
inner = p[IPerror]
self.assertEqual(inner.src, self.pg0.remote_ip4)
self.assertEqual(inner[TCPerror].sport, local_port)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from client to server (no translation)
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
TCP(sport=12346, dport=local_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client (no translation)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12346))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg0.remote_ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_static_lb(self):
""" NAT44ED local service load balancing """
external_addr_n = self.nat_addr
external_port = 80
local_port = 8080
server1 = self.pg0.remote_hosts[0]
server2 = self.pg0.remote_hosts[1]
locals = [{'addr': server1.ip4,
'port': local_port,
'probability': 70,
'vrf_id': 0},
{'addr': server2.ip4,
'port': local_port,
'probability': 30,
'vrf_id': 0}]
self.nat_add_address(self.nat_addr)
self.vapi.nat44_add_del_lb_static_mapping(
is_add=1,
external_addr=external_addr_n,
external_port=external_port,
protocol=IP_PROTOS.tcp,
local_num=len(locals),
locals=locals)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index,
is_add=1)
# from client to service
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=12345, dport=external_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
server = None
try:
ip = p[IP]
tcp = p[TCP]
self.assertIn(ip.dst, [server1.ip4, server2.ip4])
if ip.dst == server1.ip4:
server = server1
else:
server = server2
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client
p = (Ether(src=server.mac, dst=self.pg0.local_mac) /
IP(src=server.ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
self.assertEqual(len(sessions), 1)
self.assertTrue(sessions[0].flags &
self.config_flags.NAT_IS_EXT_HOST_VALID)
self.vapi.nat44_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=(self.config_flags.NAT_IS_INSIDE |
self.config_flags.NAT_IS_EXT_HOST_VALID),
ext_host_address=sessions[0].ext_host_address,
ext_host_port=sessions[0].ext_host_port)
sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
self.assertEqual(len(sessions), 0)
def test_static_lb_2(self):
""" NAT44ED local service load balancing (asymmetrical rule) """
external_addr = self.nat_addr
external_port = 80
local_port = 8080
server1 = self.pg0.remote_hosts[0]
server2 = self.pg0.remote_hosts[1]
locals = [{'addr': server1.ip4,
'port': local_port,
'probability': 70,
'vrf_id': 0},
{'addr': server2.ip4,
'port': local_port,
'probability': 30,
'vrf_id': 0}]
self.vapi.nat44_forwarding_enable_disable(enable=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.vapi.nat44_add_del_lb_static_mapping(is_add=1, flags=flags,
external_addr=external_addr,
external_port=external_port,
protocol=IP_PROTOS.tcp,
local_num=len(locals),
locals=locals)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index,
is_add=1)
# from client to service
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=12345, dport=external_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
server = None
try:
ip = p[IP]
tcp = p[TCP]
self.assertIn(ip.dst, [server1.ip4, server2.ip4])
if ip.dst == server1.ip4:
server = server1
else:
server = server2
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client
p = (Ether(src=server.mac, dst=self.pg0.local_mac) /
IP(src=server.ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from client to server (no translation)
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=server1.ip4) /
TCP(sport=12346, dport=local_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
server = None
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, server1.ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client (no translation)
p = (Ether(src=server1.mac, dst=self.pg0.local_mac) /
IP(src=server1.ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12346))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, server1.ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_lb_affinity(self):
""" NAT44ED local service load balancing affinity """
external_addr = self.nat_addr
external_port = 80
local_port = 8080
server1 = self.pg0.remote_hosts[0]
server2 = self.pg0.remote_hosts[1]
locals = [{'addr': server1.ip4,
'port': local_port,
'probability': 50,
'vrf_id': 0},
{'addr': server2.ip4,
'port': local_port,
'probability': 50,
'vrf_id': 0}]
self.nat_add_address(self.nat_addr)
self.vapi.nat44_add_del_lb_static_mapping(is_add=1,
external_addr=external_addr,
external_port=external_port,
protocol=IP_PROTOS.tcp,
affinity=10800,
local_num=len(locals),
locals=locals)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index,
is_add=1)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=1025, dport=external_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
backend = capture[0][IP].dst
sessions = self.vapi.nat44_user_session_dump(backend, 0)
self.assertEqual(len(sessions), 1)
self.assertTrue(sessions[0].flags &
self.config_flags.NAT_IS_EXT_HOST_VALID)
self.vapi.nat44_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=(self.config_flags.NAT_IS_INSIDE |
self.config_flags.NAT_IS_EXT_HOST_VALID),
ext_host_address=sessions[0].ext_host_address,
ext_host_port=sessions[0].ext_host_port)
pkts = []
for port in range(1030, 1100):
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=port, dport=external_port))
pkts.append(p)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for p in capture:
self.assertEqual(p[IP].dst, backend)
def test_multiple_vrf_1(self):
""" Multiple VRF - both client & service in VRF1 """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
port = 0
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1, flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg6.sw_if_index,
is_add=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg5.remote_ip4, external_addr,
local_port, external_port, vrf_id=1,
proto=IP_PROTOS.tcp, flags=flags)
p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
IP(src=self.pg6.remote_ip4, dst=external_addr) /
TCP(sport=12345, dport=external_port))
self.pg6.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg5.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
IP(src=self.pg5.remote_ip4, dst=self.pg6.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg5.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, external_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_multiple_vrf_2(self):
""" Multiple VRF - dynamic NAT from VRF1 to VRF0 (output-feature) """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
port = 0
self.nat_add_address(self.nat_addr)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1, flags=flags)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg5.remote_ip4, external_addr,
local_port, external_port, vrf_id=1,
proto=IP_PROTOS.tcp, flags=flags)
p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
IP(src=self.pg5.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=2345, dport=22))
self.pg5.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.nat_addr)
self.assert_packet_checksums_valid(p)
port = tcp.sport
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=22, dport=port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg5.remote_ip4)
self.assertEqual(tcp.dport, 2345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_multiple_vrf_3(self):
""" Multiple VRF - client in VRF1, service in VRF0 """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
port = 0
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1, flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg6.sw_if_index,
is_add=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(
self.pg0.remote_ip4,
external_sw_if_index=self.pg0.sw_if_index,
local_port=local_port,
vrf_id=0,
external_port=external_port,
proto=IP_PROTOS.tcp,
flags=flags
)
# from client VRF1 to service VRF0
p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
IP(src=self.pg6.remote_ip4, dst=self.pg0.local_ip4) /
TCP(sport=12346, dport=external_port))
self.pg6.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service VRF0 back to client VRF1
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
TCP(sport=local_port, dport=12346))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg0.local_ip4)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_multiple_vrf_4(self):
""" Multiple VRF - client in VRF0, service in VRF1 """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
port = 0
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1, flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1, flags=flags)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg5.remote_ip4, external_addr,
local_port, external_port, vrf_id=1,
proto=IP_PROTOS.tcp, flags=flags)
# from client VRF0 to service VRF1
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=external_addr) /
TCP(sport=12347, dport=external_port))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg5.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service VRF1 back to client VRF0
p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
IP(src=self.pg5.remote_ip4, dst=self.pg0.remote_ip4) /
TCP(sport=local_port, dport=12347))
self.pg5.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, external_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_multiple_vrf_5(self):
""" Multiple VRF - forwarding - no translation """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
port = 0
self.vapi.nat44_forwarding_enable_disable(enable=1)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1, flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index,
is_add=1, flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg6.sw_if_index,
is_add=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg5.remote_ip4, external_addr,
local_port, external_port, vrf_id=1,
proto=IP_PROTOS.tcp, flags=flags)
self.nat_add_static_mapping(
self.pg0.remote_ip4,
external_sw_if_index=self.pg0.sw_if_index,
local_port=local_port,
vrf_id=0,
external_port=external_port,
proto=IP_PROTOS.tcp,
flags=flags
)
# from client to server (both VRF1, no translation)
p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
IP(src=self.pg6.remote_ip4, dst=self.pg5.remote_ip4) /
TCP(sport=12348, dport=local_port))
self.pg6.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg5.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from server back to client (both VRF1, no translation)
p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
IP(src=self.pg5.remote_ip4, dst=self.pg6.remote_ip4) /
TCP(sport=local_port, dport=12348))
self.pg5.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg5.remote_ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from client VRF1 to server VRF0 (no translation)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
TCP(sport=local_port, dport=12349))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg0.remote_ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from server VRF0 back to client VRF1 (no translation)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
TCP(sport=local_port, dport=12349))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg0.remote_ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from client VRF0 to server VRF1 (no translation)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg5.remote_ip4) /
TCP(sport=12344, dport=local_port))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg5.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from server VRF1 back to client VRF0 (no translation)
p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
IP(src=self.pg5.remote_ip4, dst=self.pg0.remote_ip4) /
TCP(sport=local_port, dport=12344))
self.pg5.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg5.remote_ip4)
self.assertEqual(tcp.sport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_outside_address_distribution(self):
""" Outside address distribution based on source address """
x = 100
nat_addresses = []
for i in range(1, x):
a = "10.0.0.%d" % i
nat_addresses.append(a)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat44_add_del_address_range(
first_ip_address=nat_addresses[0],
last_ip_address=nat_addresses[-1],
vrf_id=0xFFFFFFFF, is_add=1, flags=0)
self.pg0.generate_remote_hosts(x)
pkts = []
for i in range(x):
info = self.create_packet_info(self.pg0, self.pg1)
payload = self.info_to_payload(info)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_hosts[i].ip4,
dst=self.pg1.remote_ip4) /
UDP(sport=7000+i, dport=8000+i) /
Raw(payload))
info.data = p
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
recvd = self.pg1.get_capture(len(pkts))
for p_recvd in recvd:
payload_info = self.payload_to_info(p_recvd[Raw])
packet_index = payload_info.index
info = self._packet_infos[packet_index]
self.assertTrue(info is not None)
self.assertEqual(packet_index, info.index)
p_sent = info.data
packed = socket.inet_aton(p_sent[IP].src)
numeric = struct.unpack("!L", packed)[0]
numeric = socket.htonl(numeric)
a = nat_addresses[(numeric-1) % len(nat_addresses)]
self.assertEqual(
a, p_recvd[IP].src,
"Invalid packet (src IP %s translated to %s, but expected %s)"
% (p_sent[IP].src, p_recvd[IP].src, a))
class TestNAT44EDMW(TestNAT44ED):
""" NAT44ED MW Test Case """
vpp_worker_count = 4
max_sessions = 5000
@unittest.skip('MW fix required')
def test_users_dump(self):
""" NAT44ED API test - nat44_user_dump """
@unittest.skip('MW fix required')
def test_frag_out_of_order_do_not_translate(self):
""" NAT44ED don't translate fragments arriving out of order """
@unittest.skip('MW fix required')
def test_forwarding(self):
""" NAT44ED forwarding test """
@unittest.skip('MW fix required')
def test_twice_nat(self):
""" NAT44ED Twice NAT """
@unittest.skip('MW fix required')
def test_twice_nat_lb(self):
""" NAT44ED Twice NAT local service load balancing """
@unittest.skip('MW fix required')
def test_output_feature(self):
""" NAT44ED interface output feature (in2out postrouting) """
@unittest.skip('MW fix required')
def test_static_with_port_out2(self):
""" NAT44ED 1:1 NAPT asymmetrical rule """
@unittest.skip('MW fix required')
def test_output_feature_and_service2(self):
""" NAT44ED interface output feature and service host direct access """
@unittest.skip('MW fix required')
def test_static_lb(self):
""" NAT44ED local service load balancing """
@unittest.skip('MW fix required')
def test_static_lb_2(self):
""" NAT44ED local service load balancing (asymmetrical rule) """
@unittest.skip('MW fix required')
def test_lb_affinity(self):
""" NAT44ED local service load balancing affinity """
@unittest.skip('MW fix required')
def test_multiple_vrf(self):
""" NAT44ED Multiple VRF setup """
@unittest.skip('MW fix required')
def test_self_twice_nat_positive(self):
""" NAT44ED Self Twice NAT (positive test) """
@unittest.skip('MW fix required')
def test_self_twice_nat_lb_positive(self):
""" NAT44ED Self Twice NAT local service load balancing (positive test)
"""
def test_dynamic(self):
""" NAT44ED dynamic translation test """
pkt_count = 1500
tcp_port_offset = 20
udp_port_offset = 20
icmp_id_offset = 20
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# in2out
tc1 = self.statistics['/nat44-ed/in2out/slowpath/tcp']
uc1 = self.statistics['/nat44-ed/in2out/slowpath/udp']
ic1 = self.statistics['/nat44-ed/in2out/slowpath/icmp']
dc1 = self.statistics['/nat44-ed/in2out/slowpath/drops']
i2o_pkts = [[] for x in range(0, self.vpp_worker_count)]
for i in range(pkt_count):
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=tcp_port_offset + i, dport=20))
i2o_pkts[p[TCP].sport % self.vpp_worker_count].append(p)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
UDP(sport=udp_port_offset + i, dport=20))
i2o_pkts[p[UDP].sport % self.vpp_worker_count].append(p)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
ICMP(id=icmp_id_offset + i, type='echo-request'))
i2o_pkts[p[ICMP].id % self.vpp_worker_count].append(p)
for i in range(0, self.vpp_worker_count):
if len(i2o_pkts[i]) > 0:
self.pg0.add_stream(i2o_pkts[i], worker=i)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(pkt_count * 3)
if_idx = self.pg0.sw_if_index
tc2 = self.statistics['/nat44-ed/in2out/slowpath/tcp']
uc2 = self.statistics['/nat44-ed/in2out/slowpath/udp']
ic2 = self.statistics['/nat44-ed/in2out/slowpath/icmp']
dc2 = self.statistics['/nat44-ed/in2out/slowpath/drops']
self.assertEqual(
tc2[:, if_idx].sum() - tc1[:, if_idx].sum(), pkt_count)
self.assertEqual(
uc2[:, if_idx].sum() - uc1[:, if_idx].sum(), pkt_count)
self.assertEqual(
ic2[:, if_idx].sum() - ic1[:, if_idx].sum(), pkt_count)
self.assertEqual(dc2[:, if_idx].sum() - dc1[:, if_idx].sum(), 0)
self.logger.info(self.vapi.cli("show trace"))
# out2in
tc1 = self.statistics['/nat44-ed/out2in/fastpath/tcp']
uc1 = self.statistics['/nat44-ed/out2in/fastpath/udp']
ic1 = self.statistics['/nat44-ed/out2in/fastpath/icmp']
dc1 = self.statistics['/nat44-ed/out2in/fastpath/drops']
recvd_tcp_ports = set()
recvd_udp_ports = set()
recvd_icmp_ids = set()
for p in capture:
if TCP in p:
recvd_tcp_ports.add(p[TCP].sport)
if UDP in p:
recvd_udp_ports.add(p[UDP].sport)
if ICMP in p:
recvd_icmp_ids.add(p[ICMP].id)
recvd_tcp_ports = list(recvd_tcp_ports)
recvd_udp_ports = list(recvd_udp_ports)
recvd_icmp_ids = list(recvd_icmp_ids)
o2i_pkts = [[] for x in range(0, self.vpp_worker_count)]
for i in range(pkt_count):
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(dport=choice(recvd_tcp_ports), sport=20))
o2i_pkts[p[TCP].dport % self.vpp_worker_count].append(p)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
UDP(dport=choice(recvd_udp_ports), sport=20))
o2i_pkts[p[UDP].dport % self.vpp_worker_count].append(p)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
ICMP(id=choice(recvd_icmp_ids), type='echo-reply'))
o2i_pkts[p[ICMP].id % self.vpp_worker_count].append(p)
for i in range(0, self.vpp_worker_count):
if len(o2i_pkts[i]) > 0:
self.pg1.add_stream(o2i_pkts[i], worker=i)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(pkt_count * 3)
for packet in capture:
try:
self.assert_packet_checksums_valid(packet)
self.assertEqual(packet[IP].dst, self.pg0.remote_ip4)
if packet.haslayer(TCP):
self.assert_in_range(
packet[TCP].dport, tcp_port_offset,
tcp_port_offset + pkt_count, "dst TCP port")
elif packet.haslayer(UDP):
self.assert_in_range(
packet[UDP].dport, udp_port_offset,
udp_port_offset + pkt_count, "dst UDP port")
else:
self.assert_in_range(
packet[ICMP].id, icmp_id_offset,
icmp_id_offset + pkt_count, "ICMP id")
except:
self.logger.error(ppp("Unexpected or invalid packet "
"(inside network):", packet))
raise
if_idx = self.pg1.sw_if_index
tc2 = self.statistics['/nat44-ed/out2in/fastpath/tcp']
uc2 = self.statistics['/nat44-ed/out2in/fastpath/udp']
ic2 = self.statistics['/nat44-ed/out2in/fastpath/icmp']
dc2 = self.statistics['/nat44-ed/out2in/fastpath/drops']
self.assertEqual(
tc2[:, if_idx].sum() - tc1[:, if_idx].sum(), pkt_count)
self.assertEqual(
uc2[:, if_idx].sum() - uc1[:, if_idx].sum(), pkt_count)
self.assertEqual(
ic2[:, if_idx].sum() - ic1[:, if_idx].sum(), pkt_count)
self.assertEqual(dc2[:, if_idx].sum() - dc1[:, if_idx].sum(), 0)
sc = self.statistics['/nat44-ed/total-sessions']
self.assertEqual(sc[:, 0].sum(), len(recvd_tcp_ports) +
len(recvd_udp_ports) + len(recvd_icmp_ids))
def test_frag_in_order(self):
""" NAT44ED translate fragments arriving in order """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.frag_in_order(proto=IP_PROTOS.tcp, ignore_port=True)
self.frag_in_order(proto=IP_PROTOS.udp, ignore_port=True)
self.frag_in_order(proto=IP_PROTOS.icmp, ignore_port=True)
def test_frag_in_order_do_not_translate(self):
""" NAT44ED don't translate fragments arriving in order """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat44_forwarding_enable_disable(enable=True)
self.frag_in_order(proto=IP_PROTOS.tcp, dont_translate=True)
def test_frag_out_of_order(self):
""" NAT44ED translate fragments arriving out of order """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.frag_out_of_order(proto=IP_PROTOS.tcp, ignore_port=True)
self.frag_out_of_order(proto=IP_PROTOS.udp, ignore_port=True)
self.frag_out_of_order(proto=IP_PROTOS.icmp, ignore_port=True)
def test_frag_in_order_in_plus_out(self):
""" NAT44ED in+out interface fragments in order """
in_port = self.random_port()
out_port = self.random_port()
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg0)
self.nat_add_inside_interface(self.pg1)
self.nat_add_outside_interface(self.pg1)
# add static mappings for server
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
in_port,
out_port,
proto=IP_PROTOS.tcp)
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
in_port,
out_port,
proto=IP_PROTOS.udp)
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
proto=IP_PROTOS.icmp)
# run tests for each protocol
self.frag_in_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.tcp)
self.frag_in_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.udp)
self.frag_in_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.icmp)
def test_frag_out_of_order_in_plus_out(self):
""" NAT44ED in+out interface fragments out of order """
in_port = self.random_port()
out_port = self.random_port()
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg0)
self.nat_add_inside_interface(self.pg1)
self.nat_add_outside_interface(self.pg1)
# add static mappings for server
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
in_port,
out_port,
proto=IP_PROTOS.tcp)
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
in_port,
out_port,
proto=IP_PROTOS.udp)
self.nat_add_static_mapping(self.server_addr,
self.nat_addr,
proto=IP_PROTOS.icmp)
# run tests for each protocol
self.frag_out_of_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.tcp)
self.frag_out_of_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.udp)
self.frag_out_of_order_in_plus_out(self.server_addr,
self.nat_addr,
in_port,
out_port,
IP_PROTOS.icmp)
def test_reass_hairpinning(self):
""" NAT44ED fragments hairpinning """
server_addr = self.pg0.remote_hosts[1].ip4
host_in_port = self.random_port()
server_in_port = self.random_port()
server_out_port = self.random_port()
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# add static mapping for server
self.nat_add_static_mapping(server_addr, self.nat_addr,
server_in_port, server_out_port,
proto=IP_PROTOS.tcp)
self.nat_add_static_mapping(server_addr, self.nat_addr,
server_in_port, server_out_port,
proto=IP_PROTOS.udp)
self.nat_add_static_mapping(server_addr, self.nat_addr)
self.reass_hairpinning(server_addr, server_in_port, server_out_port,
host_in_port, proto=IP_PROTOS.tcp,
ignore_port=True)
self.reass_hairpinning(server_addr, server_in_port, server_out_port,
host_in_port, proto=IP_PROTOS.udp,
ignore_port=True)
self.reass_hairpinning(server_addr, server_in_port, server_out_port,
host_in_port, proto=IP_PROTOS.icmp,
ignore_port=True)
def test_session_limit_per_vrf(self):
""" NAT44ED per vrf session limit """
inside = self.pg0
inside_vrf10 = self.pg2
outside = self.pg1
limit = 5
# 2 interfaces pg0, pg1 (vrf10, limit 1 tcp session)
# non existing vrf_id makes process core dump
self.vapi.nat44_set_session_limit(session_limit=limit, vrf_id=10)
self.nat_add_inside_interface(inside)
self.nat_add_inside_interface(inside_vrf10)
self.nat_add_outside_interface(outside)
# vrf independent
self.nat_add_interface_address(outside)
# BUG: causing core dump - when bad vrf_id is specified
# self.nat_add_address(outside.local_ip4, vrf_id=20)
stream = self.create_tcp_stream(inside_vrf10, outside, limit * 2)
inside_vrf10.add_stream(stream)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = outside.get_capture(limit)
stream = self.create_tcp_stream(inside, outside, limit * 2)
inside.add_stream(stream)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = outside.get_capture(len(stream))
def test_show_max_translations(self):
""" NAT44ED API test - max translations per thread """
nat_config = self.vapi.nat_show_config_2()
self.assertEqual(self.max_sessions,
nat_config.max_translations_per_thread)
def test_lru_cleanup(self):
""" NAT44ED LRU cleanup algorithm """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat_set_timeouts(
udp=1, tcp_established=7440, tcp_transitory=30, icmp=1)
tcp_port_out = self.init_tcp_session(self.pg0, self.pg1, 2000, 80)
pkts = []
for i in range(0, self.max_sessions - 1):
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
UDP(sport=7000+i, dport=80))
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(len(pkts))
self.sleep(1.5, "wait for timeouts")
pkts = []
for i in range(0, self.max_sessions - 1):
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
ICMP(id=8000+i, type='echo-request'))
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(len(pkts))
def test_session_rst_timeout(self):
""" NAT44ED session RST timeouts """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
tcp_transitory=5, icmp=60)
self.init_tcp_session(self.pg0, self.pg1, self.tcp_port_in,
self.tcp_external_port)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
flags="R"))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
self.sleep(6)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=self.tcp_port_in + 1, dport=self.tcp_external_port + 1,
flags="S"))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
def test_dynamic_out_of_ports(self):
""" NAT44ED dynamic translation test: out of ports """
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# in2out and no NAT addresses added
err_old = self.statistics.get_err_counter(
'/err/nat44-ed-in2out-slowpath/out of ports')
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(0, timeout=1)
err_new = self.statistics.get_err_counter(
'/err/nat44-ed-in2out-slowpath/out of ports')
self.assertEqual(err_new - err_old, len(pkts))
# in2out after NAT addresses added
self.nat_add_address(self.nat_addr)
err_old = self.statistics.get_err_counter(
'/err/nat44-ed-in2out-slowpath/out of ports')
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
err_new = self.statistics.get_err_counter(
'/err/nat44-ed-in2out-slowpath/out of ports')
self.assertEqual(err_new, err_old)
def test_unknown_proto(self):
""" NAT44ED translate packet with unknown protocol """
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# in2out
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=self.tcp_port_in, dport=20))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
p = self.pg1.get_capture(1)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
GRE() /
IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
TCP(sport=1234, dport=1234))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
p = self.pg1.get_capture(1)
packet = p[0]
try:
self.assertEqual(packet[IP].src, self.nat_addr)
self.assertEqual(packet[IP].dst, self.pg1.remote_ip4)
self.assertEqual(packet.haslayer(GRE), 1)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# out2in
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
GRE() /
IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
TCP(sport=1234, dport=1234))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
p = self.pg0.get_capture(1)
packet = p[0]
try:
self.assertEqual(packet[IP].src, self.pg1.remote_ip4)
self.assertEqual(packet[IP].dst, self.pg0.remote_ip4)
self.assertEqual(packet.haslayer(GRE), 1)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
def test_hairpinning_unknown_proto(self):
""" NAT44ED translate packet with unknown protocol - hairpinning """
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_in_port = 1234
server_out_port = 8765
server_nat_ip = "10.0.0.11"
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# add static mapping for server
self.nat_add_static_mapping(server.ip4, server_nat_ip)
# host to server
p = (Ether(src=host.mac, dst=self.pg0.local_mac) /
IP(src=host.ip4, dst=server_nat_ip) /
TCP(sport=host_in_port, dport=server_out_port))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
p = (Ether(dst=self.pg0.local_mac, src=host.mac) /
IP(src=host.ip4, dst=server_nat_ip) /
GRE() /
IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
TCP(sport=1234, dport=1234))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
p = self.pg0.get_capture(1)
packet = p[0]
try:
self.assertEqual(packet[IP].src, self.nat_addr)
self.assertEqual(packet[IP].dst, server.ip4)
self.assertEqual(packet.haslayer(GRE), 1)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server to host
p = (Ether(dst=self.pg0.local_mac, src=server.mac) /
IP(src=server.ip4, dst=self.nat_addr) /
GRE() /
IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
TCP(sport=1234, dport=1234))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
p = self.pg0.get_capture(1)
packet = p[0]
try:
self.assertEqual(packet[IP].src, server_nat_ip)
self.assertEqual(packet[IP].dst, host.ip4)
self.assertEqual(packet.haslayer(GRE), 1)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
def test_output_feature_and_service(self):
""" NAT44ED interface output feature and services """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.nat_addr)
flags = self.config_flags.NAT_IS_ADDR_ONLY
self.vapi.nat44_add_del_identity_mapping(
ip_address=self.pg1.remote_ip4, sw_if_index=0xFFFFFFFF,
flags=flags, is_add=1)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg0.remote_ip4, external_addr,
local_port, external_port,
proto=IP_PROTOS.tcp, flags=flags)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg0)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1)
# from client to service
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=external_addr) /
TCP(sport=12345, dport=external_port))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, external_addr)
self.assertEqual(tcp.sport, external_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from local network host to external network
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
# from external network back to local network host
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
def test_output_feature_and_service3(self):
""" NAT44ED interface output feature and DST NAT """
external_addr = '1.2.3.4'
external_port = 80
local_port = 8080
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.nat_addr)
flags = self.config_flags.NAT_IS_OUT2IN_ONLY
self.nat_add_static_mapping(self.pg1.remote_ip4, external_addr,
local_port, external_port,
proto=IP_PROTOS.tcp, flags=flags)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg0)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1)
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=external_addr) /
TCP(sport=12345, dport=external_port))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg0.remote_ip4)
self.assertEqual(tcp.sport, 12345)
self.assertEqual(ip.dst, self.pg1.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
TCP(sport=local_port, dport=12345))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, external_addr)
self.assertEqual(tcp.sport, external_port)
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.dport, 12345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_self_twice_nat_lb_negative(self):
""" NAT44ED Self Twice NAT local service load balancing (negative test)
"""
self.twice_nat_common(lb=True, self_twice_nat=True, same_pg=True,
client_id=2)
def test_self_twice_nat_negative(self):
""" NAT44ED Self Twice NAT (negative test) """
self.twice_nat_common(self_twice_nat=True)
def test_static_lb_multi_clients(self):
""" NAT44ED local service load balancing - multiple clients"""
external_addr = self.nat_addr
external_port = 80
local_port = 8080
server1 = self.pg0.remote_hosts[0]
server2 = self.pg0.remote_hosts[1]
server3 = self.pg0.remote_hosts[2]
locals = [{'addr': server1.ip4,
'port': local_port,
'probability': 90,
'vrf_id': 0},
{'addr': server2.ip4,
'port': local_port,
'probability': 10,
'vrf_id': 0}]
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index,
is_add=1)
self.nat_add_address(self.nat_addr)
self.vapi.nat44_add_del_lb_static_mapping(is_add=1,
external_addr=external_addr,
external_port=external_port,
protocol=IP_PROTOS.tcp,
local_num=len(locals),
locals=locals)
server1_n = 0
server2_n = 0
clients = ip4_range(self.pg1.remote_ip4, 10, 50)
pkts = []
for client in clients:
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=client, dst=self.nat_addr) /
TCP(sport=12345, dport=external_port))
pkts.append(p)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for p in capture:
if p[IP].dst == server1.ip4:
server1_n += 1
else:
server2_n += 1
self.assertGreaterEqual(server1_n, server2_n)
local = {
'addr': server3.ip4,
'port': local_port,
'probability': 20,
'vrf_id': 0
}
# add new back-end
self.vapi.nat44_lb_static_mapping_add_del_local(
is_add=1,
external_addr=external_addr,
external_port=external_port,
local=local,
protocol=IP_PROTOS.tcp)
server1_n = 0
server2_n = 0
server3_n = 0
clients = ip4_range(self.pg1.remote_ip4, 60, 110)
pkts = []
for client in clients:
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=client, dst=self.nat_addr) /
TCP(sport=12346, dport=external_port))
pkts.append(p)
self.assertGreater(len(pkts), 0)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for p in capture:
if p[IP].dst == server1.ip4:
server1_n += 1
elif p[IP].dst == server2.ip4:
server2_n += 1
else:
server3_n += 1
self.assertGreater(server1_n, 0)
self.assertGreater(server2_n, 0)
self.assertGreater(server3_n, 0)
local = {
'addr': server2.ip4,
'port': local_port,
'probability': 10,
'vrf_id': 0
}
# remove one back-end
self.vapi.nat44_lb_static_mapping_add_del_local(
is_add=0,
external_addr=external_addr,
external_port=external_port,
local=local,
protocol=IP_PROTOS.tcp)
server1_n = 0
server2_n = 0
server3_n = 0
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for p in capture:
if p[IP].dst == server1.ip4:
server1_n += 1
elif p[IP].dst == server2.ip4:
server2_n += 1
else:
server3_n += 1
self.assertGreater(server1_n, 0)
self.assertEqual(server2_n, 0)
self.assertGreater(server3_n, 0)
def test_syslog_sess(self):
""" NAT44ED Test syslog session creation and deletion """
self.vapi.syslog_set_filter(
self.syslog_severity.SYSLOG_API_SEVERITY_INFO)
self.vapi.syslog_set_sender(self.pg3.local_ip4, self.pg3.remote_ip4)
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=self.tcp_port_in, dport=self.tcp_external_port))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
self.tcp_port_out = capture[0][TCP].sport
capture = self.pg3.get_capture(1)
self.verify_syslog_sess(capture[0][Raw].load)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.nat_add_address(self.nat_addr, is_add=0)
capture = self.pg3.get_capture(1)
self.verify_syslog_sess(capture[0][Raw].load, False)
def test_twice_nat_interface_addr(self):
""" NAT44ED Acquire twice NAT addresses from interface """
flags = self.config_flags.NAT_IS_TWICE_NAT
self.vapi.nat44_add_del_interface_addr(
sw_if_index=self.pg11.sw_if_index,
flags=flags, is_add=1)
# no address in NAT pool
adresses = self.vapi.nat44_address_dump()
self.assertEqual(0, len(adresses))
# configure interface address and check NAT address pool
self.pg11.config_ip4()
adresses = self.vapi.nat44_address_dump()
self.assertEqual(1, len(adresses))
self.assertEqual(str(adresses[0].ip_address),
self.pg11.local_ip4)
self.assertEqual(adresses[0].flags, flags)
# remove interface address and check NAT address pool
self.pg11.unconfig_ip4()
adresses = self.vapi.nat44_address_dump()
self.assertEqual(0, len(adresses))
def test_output_feature_stateful_acl(self):
""" NAT44ED output feature works with stateful ACL """
self.nat_add_address(self.nat_addr)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg0.sw_if_index,
flags=self.config_flags.NAT_IS_INSIDE, is_add=1)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg1.sw_if_index,
flags=self.config_flags.NAT_IS_OUTSIDE, is_add=1)
# First ensure that the NAT is working sans ACL
# send packets out2in, no sessions yet so packets should drop
pkts_out2in = self.create_stream_out(self.pg1)
self.send_and_assert_no_replies(self.pg1, pkts_out2in)
# send packets into inside intf, ensure received via outside intf
pkts_in2out = self.create_stream_in(self.pg0, self.pg1)
capture = self.send_and_expect(self.pg0, pkts_in2out, self.pg1,
len(pkts_in2out))
self.verify_capture_out(capture, ignore_port=True)
# send out2in again, with sessions created it should work now
pkts_out2in = self.create_stream_out(self.pg1)
capture = self.send_and_expect(self.pg1, pkts_out2in, self.pg0,
len(pkts_out2in))
self.verify_capture_in(capture, self.pg0)
# Create an ACL blocking everything
out2in_deny_rule = AclRule(is_permit=0)
out2in_acl = VppAcl(self, rules=[out2in_deny_rule])
out2in_acl.add_vpp_config()
# create an ACL to permit/reflect everything
in2out_reflect_rule = AclRule(is_permit=2)
in2out_acl = VppAcl(self, rules=[in2out_reflect_rule])
in2out_acl.add_vpp_config()
# apply as input acl on interface and confirm it blocks everything
acl_if = VppAclInterface(self, sw_if_index=self.pg1.sw_if_index,
n_input=1, acls=[out2in_acl])
acl_if.add_vpp_config()
self.send_and_assert_no_replies(self.pg1, pkts_out2in)
# apply output acl
acl_if.acls = [out2in_acl, in2out_acl]
acl_if.add_vpp_config()
# send in2out to generate ACL state (NAT state was created earlier)
capture = self.send_and_expect(self.pg0, pkts_in2out, self.pg1,
len(pkts_in2out))
self.verify_capture_out(capture, ignore_port=True)
# send out2in again. ACL state exists so it should work now.
# TCP packets with the syn flag set also need the ack flag
for p in pkts_out2in:
if p.haslayer(TCP) and p[TCP].flags & 0x02:
p[TCP].flags |= 0x10
capture = self.send_and_expect(self.pg1, pkts_out2in, self.pg0,
len(pkts_out2in))
self.verify_capture_in(capture, self.pg0)
self.logger.info(self.vapi.cli("show trace"))
def test_tcp_close(self):
""" NAT44ED Close TCP session from inside network - output feature """
old_timeouts = self.vapi.nat_get_timeouts()
new_transitory = 2
self.vapi.nat_set_timeouts(
udp=old_timeouts.udp,
tcp_established=old_timeouts.tcp_established,
icmp=old_timeouts.icmp,
tcp_transitory=new_transitory)
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.pg1.local_ip4)
twice_nat_addr = '10.0.1.3'
service_ip = '192.168.16.150'
self.nat_add_address(twice_nat_addr, twice_nat=1)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_output_feature(
is_add=1,
sw_if_index=self.pg1.sw_if_index)
flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
self.config_flags.NAT_IS_TWICE_NAT)
self.nat_add_static_mapping(self.pg0.remote_ip4,
service_ip, 80, 80,
proto=IP_PROTOS.tcp,
flags=flags)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
start_sessnum = len(sessions)
# SYN packet out->in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=service_ip) /
TCP(sport=33898, dport=80, flags="S"))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
p = capture[0]
tcp_port = p[TCP].sport
# SYN + ACK packet in->out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
TCP(sport=80, dport=tcp_port, flags="SA"))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# ACK packet out->in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=service_ip) /
TCP(sport=33898, dport=80, flags="A"))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
# FIN packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
TCP(sport=80, dport=tcp_port, flags="FA", seq=100, ack=300))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# FIN+ACK packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=service_ip) /
TCP(sport=33898, dport=80, flags="FA", seq=300, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
# ACK packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
TCP(sport=80, dport=tcp_port, flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# session now in transitory timeout
# try SYN packet out->in - should be dropped
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=service_ip) /
TCP(sport=33898, dport=80, flags="S"))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.sleep(new_transitory, "wait for transitory timeout")
self.pg0.assert_nothing_captured(0)
# session should still exist
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - start_sessnum, 1)
# send FIN+ACK packet out -> in - will cause session to be wiped
# but won't create a new session
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=service_ip) /
TCP(sport=33898, dport=80, flags="FA", seq=300, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - start_sessnum, 0)
self.pg0.assert_nothing_captured(0)
def test_tcp_session_close_in(self):
""" NAT44ED Close TCP session from inside network """
in_port = self.tcp_port_in
out_port = 10505
ext_port = self.tcp_external_port
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
in_port, out_port, proto=IP_PROTOS.tcp,
flags=self.config_flags.NAT_IS_TWICE_NAT)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
session_n = len(sessions)
self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
tcp_transitory=2, icmp=5)
self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
# FIN packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="FA", seq=100, ack=300))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
pkts = []
# ACK packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="A", seq=300, ack=101))
pkts.append(p)
# FIN packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=300, ack=101))
pkts.append(p)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(2)
# ACK packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
out2in_drops = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
in2out_drops = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
# extra FIN packet out -> in - this should be dropped
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=300, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.assert_nothing_captured()
# extra ACK packet in -> out - this should be dropped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
stats = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
self.assertEqual(stats - out2in_drops, 1)
stats = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
self.assertEqual(stats - in2out_drops, 1)
self.sleep(3)
# extra ACK packet in -> out - this will cause session to be wiped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_tcp_session_close_out(self):
""" NAT44ED Close TCP session from outside network """
in_port = self.tcp_port_in
out_port = 10505
ext_port = self.tcp_external_port
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
in_port, out_port, proto=IP_PROTOS.tcp,
flags=self.config_flags.NAT_IS_TWICE_NAT)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
session_n = len(sessions)
self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
tcp_transitory=2, icmp=5)
_ = self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
# FIN packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=100, ack=300))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
# FIN+ACK packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="FA", seq=300, ack=101))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# ACK packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="A", seq=101, ack=301))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
out2in_drops = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
in2out_drops = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
# extra FIN packet out -> in - this should be dropped
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=300, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.assert_nothing_captured()
# extra ACK packet in -> out - this should be dropped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
stats = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
self.assertEqual(stats - out2in_drops, 1)
stats = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
self.assertEqual(stats - in2out_drops, 1)
self.sleep(3)
# extra ACK packet in -> out - this will cause session to be wiped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_tcp_session_close_simultaneous(self):
""" NAT44ED Close TCP session from inside network """
in_port = self.tcp_port_in
ext_port = 10505
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
in_port, ext_port, proto=IP_PROTOS.tcp,
flags=self.config_flags.NAT_IS_TWICE_NAT)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
session_n = len(sessions)
self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
tcp_transitory=2, icmp=5)
out_port = self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
# FIN packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="FA", seq=100, ack=300))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# FIN packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=300, ack=100))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
# ACK packet in -> out
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(1)
# ACK packet out -> in
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="A", seq=301, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
out2in_drops = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
in2out_drops = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
# extra FIN packet out -> in - this should be dropped
p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
TCP(sport=ext_port, dport=out_port,
flags="FA", seq=300, ack=101))
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.assert_nothing_captured()
# extra ACK packet in -> out - this should be dropped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
stats = self.get_err_counter(
'/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
self.assertEqual(stats - out2in_drops, 1)
stats = self.get_err_counter(
'/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
self.assertEqual(stats - in2out_drops, 1)
self.sleep(3)
# extra ACK packet in -> out - this will cause session to be wiped
p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=in_port, dport=ext_port,
flags="A", seq=101, ack=301))
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_dynamic_vrf(self):
""" NAT44ED dynamic translation test: different VRF"""
vrf_id_in = 33
vrf_id_out = 34
self.nat_add_address(self.nat_addr, vrf_id=vrf_id_in)
try:
self.configure_ip4_interface(self.pg7, table_id=vrf_id_in)
self.configure_ip4_interface(self.pg8, table_id=vrf_id_out)
self.nat_add_inside_interface(self.pg7)
self.nat_add_outside_interface(self.pg8)
# just basic stuff nothing special
pkts = self.create_stream_in(self.pg7, self.pg8)
self.pg7.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg8.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
pkts = self.create_stream_out(self.pg8)
self.pg8.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg7.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg7)
finally:
self.pg7.unconfig()
self.pg8.unconfig()
self.vapi.ip_table_add_del(is_add=0,
table={'table_id': vrf_id_in})
self.vapi.ip_table_add_del(is_add=0,
table={'table_id': vrf_id_out})
def test_dynamic_output_feature_vrf(self):
""" NAT44ED dynamic translation test: output-feature, VRF"""
# other then default (0)
new_vrf_id = 22
self.nat_add_address(self.nat_addr)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg7.sw_if_index,
flags=flags, is_add=1)
self.vapi.nat44_interface_add_del_output_feature(
sw_if_index=self.pg8.sw_if_index,
is_add=1)
try:
self.configure_ip4_interface(self.pg7, table_id=new_vrf_id)
self.configure_ip4_interface(self.pg8, table_id=new_vrf_id)
# in2out
tcpn = self.statistics['/nat44-ed/in2out/slowpath/tcp']
udpn = self.statistics['/nat44-ed/in2out/slowpath/udp']
icmpn = self.statistics['/nat44-ed/in2out/slowpath/icmp']
drops = self.statistics['/nat44-ed/in2out/slowpath/drops']
pkts = self.create_stream_in(self.pg7, self.pg8)
self.pg7.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg8.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
if_idx = self.pg7.sw_if_index
cnt = self.statistics['/nat44-ed/in2out/slowpath/tcp']
self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
cnt = self.statistics['/nat44-ed/in2out/slowpath/udp']
self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
cnt = self.statistics['/nat44-ed/in2out/slowpath/icmp']
self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
cnt = self.statistics['/nat44-ed/in2out/slowpath/drops']
self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
# out2in
tcpn = self.statistics['/nat44-ed/out2in/fastpath/tcp']
udpn = self.statistics['/nat44-ed/out2in/fastpath/udp']
icmpn = self.statistics['/nat44-ed/out2in/fastpath/icmp']
drops = self.statistics['/nat44-ed/out2in/fastpath/drops']
pkts = self.create_stream_out(self.pg8)
self.pg8.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg7.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg7)
if_idx = self.pg8.sw_if_index
cnt = self.statistics['/nat44-ed/out2in/fastpath/tcp']
self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
cnt = self.statistics['/nat44-ed/out2in/fastpath/udp']
self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
cnt = self.statistics['/nat44-ed/out2in/fastpath/icmp']
self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
cnt = self.statistics['/nat44-ed/out2in/fastpath/drops']
self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
sessions = self.statistics['/nat44-ed/total-sessions']
self.assertEqual(sessions[:, 0].sum(), 3)
finally:
self.pg7.unconfig()
self.pg8.unconfig()
self.vapi.ip_table_add_del(is_add=0,
table={'table_id': new_vrf_id})
def test_next_src_nat(self):
""" NAT44ED On way back forward packet to nat44-in2out node. """
twice_nat_addr = '10.0.1.3'
external_port = 80
local_port = 8080
post_twice_nat_port = 0
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(twice_nat_addr, twice_nat=1)
flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
self.config_flags.NAT_IS_SELF_TWICE_NAT)
self.nat_add_static_mapping(self.pg6.remote_ip4, self.pg1.remote_ip4,
local_port, external_port,
proto=IP_PROTOS.tcp, vrf_id=1,
flags=flags)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg6.sw_if_index,
is_add=1)
p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
IP(src=self.pg6.remote_ip4, dst=self.pg1.remote_ip4) /
TCP(sport=12345, dport=external_port))
self.pg6.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, twice_nat_addr)
self.assertNotEqual(tcp.sport, 12345)
post_twice_nat_port = tcp.sport
self.assertEqual(ip.dst, self.pg6.remote_ip4)
self.assertEqual(tcp.dport, local_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
IP(src=self.pg6.remote_ip4, dst=twice_nat_addr) /
TCP(sport=local_port, dport=post_twice_nat_port))
self.pg6.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.pg1.remote_ip4)
self.assertEqual(tcp.sport, external_port)
self.assertEqual(ip.dst, self.pg6.remote_ip4)
self.assertEqual(tcp.dport, 12345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_one_armed_nat44_static(self):
""" NAT44ED One armed NAT and 1:1 NAPT asymmetrical rule """
remote_host = self.pg4.remote_hosts[0]
local_host = self.pg4.remote_hosts[1]
external_port = 80
local_port = 8080
eh_port_in = 0
self.vapi.nat44_forwarding_enable_disable(enable=1)
self.nat_add_address(self.nat_addr, twice_nat=1)
flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
self.config_flags.NAT_IS_TWICE_NAT)
self.nat_add_static_mapping(local_host.ip4, self.nat_addr,
local_port, external_port,
proto=IP_PROTOS.tcp, flags=flags)
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg4.sw_if_index,
is_add=1)
self.vapi.nat44_interface_add_del_feature(
sw_if_index=self.pg4.sw_if_index,
flags=flags, is_add=1)
# from client to service
p = (Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac) /
IP(src=remote_host.ip4, dst=self.nat_addr) /
TCP(sport=12345, dport=external_port))
self.pg4.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg4.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.dst, local_host.ip4)
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.dport, local_port)
self.assertNotEqual(tcp.sport, 12345)
eh_port_in = tcp.sport
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# from service back to client
p = (Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac) /
IP(src=local_host.ip4, dst=self.nat_addr) /
TCP(sport=local_port, dport=eh_port_in))
self.pg4.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg4.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(ip.dst, remote_host.ip4)
self.assertEqual(tcp.sport, external_port)
self.assertEqual(tcp.dport, 12345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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