Gitiles
Code Review Sign In
gerrit.nordix.org / fdio / vpp / 3628353e093752f34704a82ae85a27d8f951e05e / . / test / test_nat44_ed.py
blob: 83629bb185b0cad5c50ff90bade2fcb2a05341dd [file] [log] [blame]
#!/usr/bin/env python3
import unittest
from io import BytesIO
from random import randint, choice
import re
import scapy.compat
from framework import VppTestCase, VppLoInterface
from asfframework import VppTestRunner, is_distro_ubuntu2204
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 statistics import variance
from syslog_rfc5424_parser import SyslogMessage, ParseError
from syslog_rfc5424_parser.constants import SyslogSeverity
from util import ppp, pr, ip4_range
from vpp_acl import AclRule, VppAcl, VppAclInterface
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_papi import VppEnum
from util import StatsDiff
from config import config
@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
class TestNAT44ED(VppTestCase):
"""NAT44ED Test Case"""
nat_addr = "10.0.10.3"
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().setUp()
self.plugin_enable()
def tearDown(self):
super().tearDown()
if not self.vpp_dead:
self.plugin_disable()
def plugin_enable(self, max_sessions=None):
max_sessions = max_sessions or self.max_sessions
self.vapi.nat44_ed_plugin_enable_disable(sessions=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(1024, 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_v2(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().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_v2(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()
cls.no_diff = StatsDiff(
{
pg.sw_if_index: {
"/nat44-ed/in2out/fastpath/tcp": 0,
"/nat44-ed/in2out/fastpath/udp": 0,
"/nat44-ed/in2out/fastpath/icmp": 0,
"/nat44-ed/in2out/fastpath/drops": 0,
"/nat44-ed/in2out/slowpath/tcp": 0,
"/nat44-ed/in2out/slowpath/udp": 0,
"/nat44-ed/in2out/slowpath/icmp": 0,
"/nat44-ed/in2out/slowpath/drops": 0,
"/nat44-ed/in2out/fastpath/tcp": 0,
"/nat44-ed/in2out/fastpath/udp": 0,
"/nat44-ed/in2out/fastpath/icmp": 0,
"/nat44-ed/in2out/fastpath/drops": 0,
"/nat44-ed/in2out/slowpath/tcp": 0,
"/nat44-ed/in2out/slowpath/udp": 0,
"/nat44-ed/in2out/slowpath/icmp": 0,
"/nat44-ed/in2out/slowpath/drops": 0,
}
for pg in cls.pg_interfaces
}
)
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_udp_stream(self, in_if, out_if, count, base_port=6303):
return [
(
Ether(dst=in_if.local_mac, src=in_if.remote_mac)
/ IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=64)
/ UDP(sport=base_port + i, dport=20)
)
for i in range(count)
]
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, msgid, 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, msgid)
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)
def test_icmp_error(self):
"""NAT44ED test ICMP error message with inner header"""
payload = "H" * 10
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# in2out (initiate connection)
p1 = [
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ UDP(sport=21, dport=20)
/ payload,
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ TCP(sport=21, dport=20, flags="S")
/ payload,
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ ICMP(type="echo-request", id=7777)
/ payload,
]
capture = self.send_and_expect(self.pg0, p1, self.pg1)
# out2in (send error message)
p2 = [
Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr)
/ ICMP(type="dest-unreach", code="port-unreachable")
/ c[IP:]
for c in capture
]
capture = self.send_and_expect(self.pg1, p2, self.pg0)
for c in capture:
try:
assert c[IP].dst == self.pg0.remote_ip4
assert c[IPerror].src == self.pg0.remote_ip4
except AssertionError as a:
raise AssertionError(f"Packet {pr(c)} not translated properly") from a
def test_icmp_echo_reply_trailer(self):
"""ICMP echo reply with ethernet trailer"""
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# in2out
p1 = (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ ICMP(type=8, id=0xABCD, seq=0)
)
self.pg0.add_stream(p1)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
c = self.pg1.get_capture(1)[0]
self.logger.debug(self.vapi.cli("show trace"))
# out2in
p2 = (
Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr, id=0xEE59)
/ ICMP(type=0, id=c[ICMP].id, seq=0)
)
# force checksum calculation
p2 = p2.__class__(bytes(p2))
self.logger.debug(ppp("Packet before modification:", p2))
# hex representation of vss monitoring ethernet trailer
# this seems to be just added to end of packet without modifying
# IP or ICMP lengths / checksums
p2 = p2 / Raw("\x00\x00\x52\x54\x00\x46\xab\x04\x84\x18")
# change it so that IP/ICMP is unaffected
p2[IP].len = 28
self.logger.debug(ppp("Packet with added trailer:", p2))
self.pg1.add_stream(p2)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(1)
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_ed_add_del_output_interface(
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_ed_add_del_output_interface(
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)
self.logger.debug(self.vapi.cli("show trace"))
# 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)
self.logger.debug(self.vapi.cli("show trace"))
# 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)
self.logger.debug(self.vapi.cli("show trace"))
# 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)
self.logger.debug(self.vapi.cli("show trace"))
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1, ttl=1)
capture = self.send_and_expect_some(self.pg0, pkts, self.pg0)
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_ed_add_del_output_interface(
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):
"""NAT44ED outside address distribution based on source address"""
addresses = 65
x = 100
nat_addresses = []
nat_distribution = {}
for i in range(1, addresses):
a = "10.0.0.%d" % i
nat_addresses.append(a)
nat_distribution[a] = set()
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
self.assertIn(p_recvd[IP].src, nat_distribution)
nat_distribution[p_recvd[IP].src].add(p_sent[IP].src)
var = variance(map(len, nat_distribution.values()), x / addresses)
self.assertLess(var, 0.33, msg="Bad outside address distribution")
def test_dynamic_edge_ports(self):
"""NAT44ED dynamic translation test: edge ports"""
worker_count = self.vpp_worker_count or 1
port_offset = 1024
port_per_thread = (65536 - port_offset) // worker_count
port_count = port_per_thread * worker_count
# worker thread edge ports
thread_edge_ports = {0, port_offset - 1, 65535}
for i in range(0, worker_count):
port_thread_offset = (port_per_thread * i) + port_offset
for port_range_offset in [0, port_per_thread - 1]:
port = port_thread_offset + port_range_offset
thread_edge_ports.add(port)
thread_drop_ports = set(
filter(
lambda x: x not in range(port_offset, port_offset + port_count),
thread_edge_ports,
)
)
in_if = self.pg7
out_if = self.pg8
self.nat_add_address(self.nat_addr)
try:
self.configure_ip4_interface(in_if, hosts=worker_count)
self.configure_ip4_interface(out_if)
self.nat_add_inside_interface(in_if)
self.nat_add_outside_interface(out_if)
# 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"]
pkt_count = worker_count * len(thread_edge_ports)
i2o_pkts = [[] for x in range(0, worker_count)]
for i in range(0, worker_count):
remote_host = in_if.remote_hosts[i]
for port in thread_edge_ports:
p = (
Ether(dst=in_if.local_mac, src=in_if.remote_mac)
/ IP(src=remote_host.ip4, dst=out_if.remote_ip4)
/ TCP(sport=port, dport=port)
)
i2o_pkts[i].append(p)
p = (
Ether(dst=in_if.local_mac, src=in_if.remote_mac)
/ IP(src=remote_host.ip4, dst=out_if.remote_ip4)
/ UDP(sport=port, dport=port)
)
i2o_pkts[i].append(p)
p = (
Ether(dst=in_if.local_mac, src=in_if.remote_mac)
/ IP(src=remote_host.ip4, dst=out_if.remote_ip4)
/ ICMP(id=port, seq=port, type="echo-request")
)
i2o_pkts[i].append(p)
for i in range(0, worker_count):
if len(i2o_pkts[i]) > 0:
in_if.add_stream(i2o_pkts[i], worker=i)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = out_if.get_capture(pkt_count * 3)
for packet in capture:
self.assert_packet_checksums_valid(packet)
if packet.haslayer(TCP):
self.assert_in_range(
packet[TCP].sport,
port_offset,
port_offset + port_count,
"src TCP port",
)
elif packet.haslayer(UDP):
self.assert_in_range(
packet[UDP].sport,
port_offset,
port_offset + port_count,
"src UDP port",
)
elif packet.haslayer(ICMP):
self.assert_in_range(
packet[ICMP].id,
port_offset,
port_offset + port_count,
"ICMP id",
)
else:
self.fail(
ppp("Unexpected or invalid packet (outside network):", packet)
)
if_idx = in_if.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)
# 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"]
dc3 = self.statistics["/nat44-ed/out2in/slowpath/drops"]
# replies to unchanged thread ports should pass on each worker,
# excluding packets outside dynamic port range
drop_count = worker_count * len(thread_drop_ports)
pass_count = worker_count * len(thread_edge_ports) - drop_count
o2i_pkts = [[] for x in range(0, worker_count)]
for i in range(0, worker_count):
for port in thread_edge_ports:
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IP(src=out_if.remote_ip4, dst=self.nat_addr)
/ TCP(sport=port, dport=port)
)
o2i_pkts[i].append(p)
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IP(src=out_if.remote_ip4, dst=self.nat_addr)
/ UDP(sport=port, dport=port)
)
o2i_pkts[i].append(p)
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IP(src=out_if.remote_ip4, dst=self.nat_addr)
/ ICMP(id=port, seq=port, type="echo-reply")
)
o2i_pkts[i].append(p)
for i in range(0, worker_count):
if len(o2i_pkts[i]) > 0:
out_if.add_stream(o2i_pkts[i], worker=i)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = in_if.get_capture(pass_count * 3)
for packet in capture:
self.assert_packet_checksums_valid(packet)
if packet.haslayer(TCP):
self.assertIn(packet[TCP].dport, thread_edge_ports, "dst TCP port")
self.assertEqual(packet[TCP].dport, packet[TCP].sport, "TCP ports")
elif packet.haslayer(UDP):
self.assertIn(packet[UDP].dport, thread_edge_ports, "dst UDP port")
self.assertEqual(packet[UDP].dport, packet[UDP].sport, "UDP ports")
elif packet.haslayer(ICMP):
self.assertIn(packet[ICMP].id, thread_edge_ports, "ICMP id")
self.assertEqual(packet[ICMP].id, packet[ICMP].seq, "ICMP id & seq")
else:
self.fail(
ppp("Unexpected or invalid packet (inside network):", packet)
)
if_idx = out_if.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"]
dc4 = self.statistics["/nat44-ed/out2in/slowpath/drops"]
self.assertEqual(tc2[:, if_idx].sum() - tc1[:, if_idx].sum(), pass_count)
self.assertEqual(uc2[:, if_idx].sum() - uc1[:, if_idx].sum(), pass_count)
self.assertEqual(ic2[:, if_idx].sum() - ic1[:, if_idx].sum(), pass_count)
self.assertEqual(dc2[:, if_idx].sum() - dc1[:, if_idx].sum(), 0)
self.assertEqual(
dc4[:, if_idx].sum() - dc3[:, if_idx].sum(), drop_count * 3
)
finally:
in_if.unconfig()
out_if.unconfig()
def test_delete_interface(self):
"""NAT44ED delete nat interface"""
self.nat_add_address(self.nat_addr)
interfaces = self.create_loopback_interfaces(4)
self.nat_add_outside_interface(interfaces[0])
self.nat_add_inside_interface(interfaces[1])
self.nat_add_outside_interface(interfaces[2])
self.nat_add_inside_interface(interfaces[2])
self.vapi.nat44_ed_add_del_output_interface(
sw_if_index=interfaces[3].sw_if_index, is_add=1
)
nat_sw_if_indices = [
i.sw_if_index
for i in self.vapi.nat44_interface_dump()
+ list(self.vapi.vpp.details_iter(self.vapi.nat44_ed_output_interface_get))
]
self.assertEqual(len(nat_sw_if_indices), len(interfaces))
loopbacks = []
for i in interfaces:
# delete nat-enabled interface
self.assertIn(i.sw_if_index, nat_sw_if_indices)
i.remove_vpp_config()
# create interface with the same index
lo = VppLoInterface(self)
loopbacks.append(lo)
self.assertEqual(lo.sw_if_index, i.sw_if_index)
# check interface is not nat-enabled
nat_sw_if_indices = [
i.sw_if_index
for i in self.vapi.nat44_interface_dump()
+ list(
self.vapi.vpp.details_iter(self.vapi.nat44_ed_output_interface_get)
)
]
self.assertNotIn(lo.sw_if_index, nat_sw_if_indices)
for i in loopbacks:
i.remove_vpp_config()
@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
class TestNAT44EDMW(TestNAT44ED):
"""NAT44ED MW Test Case"""
vpp_worker_count = 4
max_sessions = 5000
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, timeout=5)
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 5 tcp sessions)
self.vapi.nat44_set_session_limit(session_limit=limit, vrf_id=10)
# expect error when bad is specified
with self.vapi.assert_negative_api_retval():
self.vapi.nat44_set_session_limit(session_limit=limit, vrf_id=20)
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"""
config = self.vapi.nat44_show_running_config()
self.assertEqual(self.max_sessions, config.sessions)
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.virtual_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.send_and_expect(self.pg0, p, self.pg1)
self.virtual_sleep(6)
# The session is already closed
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="P")
)
self.send_and_assert_no_replies(self.pg0, p, self.pg1)
# The session can be re-opened
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="S")
)
self.send_and_expect(self.pg0, p, self.pg1)
def test_session_rst_established_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
)
# Wait at least the transitory time, the session is in established
# state anyway. RST followed by a data packet should move it to
# transitory state.
self.virtual_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, dport=self.tcp_external_port, flags="R")
)
self.send_and_expect(self.pg0, p, self.pg1)
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="P")
)
self.send_and_expect(self.pg0, p, self.pg1)
# State is transitory, session should be closed after 6 seconds
self.virtual_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, dport=self.tcp_external_port, flags="P")
)
self.send_and_assert_no_replies(self.pg0, p, self.pg1)
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
pkts = self.create_stream_in(self.pg0, self.pg1)
self.send_and_assert_no_replies(
self.pg0,
pkts,
msg="i2o pkts",
stats_diff=self.no_diff
| {
"err": {
"/err/nat44-ed-in2out-slowpath/out of ports": len(pkts),
},
self.pg0.sw_if_index: {
"/nat44-ed/in2out/slowpath/drops": len(pkts),
},
},
)
# in2out after NAT addresses added
self.nat_add_address(self.nat_addr)
tcpn, udpn, icmpn = (
sum(x) for x in zip(*((TCP in p, UDP in p, ICMP in p) for p in pkts))
)
self.send_and_expect(
self.pg0,
pkts,
self.pg1,
msg="i2o pkts",
stats_diff=self.no_diff
| {
"err": {
"/err/nat44-ed-in2out-slowpath/out of ports": 0,
},
self.pg0.sw_if_index: {
"/nat44-ed/in2out/slowpath/drops": 0,
"/nat44-ed/in2out/slowpath/tcp": tcpn,
"/nat44-ed/in2out/slowpath/udp": udpn,
"/nat44-ed/in2out/slowpath/icmp": icmpn,
},
},
)
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_ed_add_del_output_interface(
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_ed_add_del_output_interface(
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)
# put zzz in front of syslog test name so that it runs as a last test
# setting syslog sender cannot be undone and if it is set, it messes
# with self.send_and_assert_no_replies functionality
def test_zzz_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, "SADD")
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, "SDEL")
# put zzz in front of syslog test name so that it runs as a last test
# setting syslog sender cannot be undone and if it is set, it messes
# with self.send_and_assert_no_replies functionality
def test_zzz_syslog_sess_reopen(self):
"""Syslog events for session reopen"""
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)
# SYN 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=self.tcp_external_port)
)
capture = self.send_and_expect(self.pg0, p, self.pg1)[0]
self.tcp_port_out = capture[0][TCP].sport
capture = self.pg3.get_capture(1)
self.verify_syslog_sess(capture[0][Raw].load, "SADD")
# SYN out2in
p = (
Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr)
/ TCP(sport=self.tcp_external_port, dport=self.tcp_port_out, flags="SA")
)
self.send_and_expect(self.pg1, p, self.pg0)
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, flags="A")
)
self.send_and_expect(self.pg0, p, self.pg1)
# FIN 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=self.tcp_external_port, flags="F")
)
self.send_and_expect(self.pg0, p, self.pg1)
# FIN out2in
p = (
Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr)
/ TCP(sport=self.tcp_external_port, dport=self.tcp_port_out, flags="F")
)
self.send_and_expect(self.pg1, p, self.pg0)
self.init_tcp_session(
self.pg0, self.pg1, self.tcp_port_in, self.tcp_external_port
)
# 2 records should be produced - first one del & add
capture = self.pg3.get_capture(2)
self.verify_syslog_sess(capture[0][Raw].load, "SDEL")
self.verify_syslog_sess(capture[1][Raw].load, "SADD")
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_ed_add_del_output_interface(
sw_if_index=self.pg1.sw_if_index, 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"""
config = self.vapi.nat44_show_running_config()
old_timeouts = config.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_ed_add_del_output_interface(
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")
)
capture = self.send_and_expect(self.pg1, p, self.pg0, n_rx=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.send_and_expect(self.pg0, p, self.pg1, n_rx=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.send_and_expect(self.pg1, p, self.pg0, n_rx=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.send_and_expect(self.pg0, p, self.pg1, n_rx=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.send_and_expect(self.pg1, p, self.pg0, n_rx=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.send_and_expect(self.pg0, p, self.pg1, n_rx=1)
# session now in transitory timeout, but traffic still flows
# try FIN 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="F")
)
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.virtual_sleep(new_transitory, "wait for transitory timeout")
self.pg0.get_capture(1)
# 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.send_and_assert_no_replies(self.pg1, p)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - start_sessnum, 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.send_and_expect(self.pg0, p, self.pg1)
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.send_and_expect(self.pg1, pkts, self.pg0)
# 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.send_and_expect(self.pg0, p, self.pg1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
# retransmit 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)
)
self.send_and_expect(self.pg1, p, self.pg0)
# retransmit 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.send_and_expect(self.pg0, p, self.pg1)
self.virtual_sleep(3)
# retransmit 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.send_and_assert_no_replies(self.pg0, p)
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)
# retransmit 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)
)
self.send_and_expect(self.pg1, p, self.pg0)
# retransmit 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.send_and_expect(self.pg0, p, self.pg1)
self.virtual_sleep(3)
# retransmit 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.send_and_assert_no_replies(self.pg0, p)
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):
"""Simultaneous TCP close from both sides"""
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.send_and_expect(self.pg0, p, self.pg1)
# 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.send_and_expect(self.pg1, p, self.pg0)
# 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.send_and_expect(self.pg0, p, self.pg1)
# 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.send_and_expect(self.pg1, p, self.pg0)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
# retransmit 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)
)
self.send_and_expect(self.pg1, p, self.pg0)
# retransmit 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.send_and_expect(self.pg0, p, self.pg1)
self.virtual_sleep(3)
# retransmit 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.pg_send(self.pg0, p)
self.send_and_assert_no_replies(self.pg0, p)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_tcp_session_half_reopen_inside(self):
"""TCP session in FIN/FIN state not reopened by in2out SYN only"""
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.send_and_expect(self.pg0, p, self.pg1)
# 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.send_and_expect(self.pg1, p, self.pg0)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
# send SYN 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="S", seq=101, ack=301)
)
self.send_and_expect(self.pg0, p, self.pg1)
self.virtual_sleep(3)
# send ACK packet in -> out - session should 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.send_and_assert_no_replies(self.pg0, p, self.pg1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_tcp_session_half_reopen_outside(self):
"""TCP session in FIN/FIN state not reopened by out2in SYN only"""
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.send_and_expect(self.pg0, p, self.pg1)
# 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.send_and_expect(self.pg1, p, self.pg0)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
# send SYN 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="S", seq=300, ack=101)
)
self.send_and_expect(self.pg1, p, self.pg0)
self.virtual_sleep(3)
# send ACK packet in -> out - session should 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.send_and_assert_no_replies(self.pg0, p, self.pg1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 0)
def test_tcp_session_reopen(self):
"""TCP session in FIN/FIN state reopened by SYN from both sides"""
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.send_and_expect(self.pg0, p, self.pg1)
# 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.send_and_expect(self.pg1, p, self.pg0)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
# send SYN 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="S", seq=300, ack=101)
)
self.send_and_expect(self.pg1, p, self.pg0)
# send SYN 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="SA", seq=101, ack=301)
)
self.send_and_expect(self.pg0, p, self.pg1)
# send 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)
)
self.send_and_expect(self.pg1, p, self.pg0)
self.virtual_sleep(3)
# send ACK packet in -> out - should be forwarded and session alive
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.send_and_expect(self.pg0, p, self.pg1)
sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions) - session_n, 1)
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_v2(is_add=0, table={"table_id": vrf_id_in})
self.vapi.ip_table_add_del_v2(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)
self.vapi.nat44_ed_add_del_output_interface(
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.pg8.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_v2(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
def test_icmp_error_fwd_outbound(self):
"""NAT44ED ICMP error outbound with forwarding enabled"""
# Ensure that an outbound ICMP error message is properly associated
# with the inbound forward bypass session it is related to.
payload = "H" * 10
self.nat_add_address(self.nat_addr)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# enable forwarding and initiate connection out2in
self.vapi.nat44_forwarding_enable_disable(enable=1)
p1 = (
Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4)
/ UDP(sport=21, dport=20)
/ payload
)
self.pg1.add_stream(p1)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)[0]
self.logger.info(self.vapi.cli("show nat44 sessions"))
# reply with ICMP error message in2out
# We cannot reliably retrieve forward bypass sessions via the API.
# session dumps for a user will only look on the worker that the
# user is supposed to be mapped to in2out. The forward bypass session
# is not necessarily created on that worker.
p2 = (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ ICMP(type="dest-unreach", code="port-unreachable")
/ capture[IP:]
)
self.pg0.add_stream(p2)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)[0]
self.logger.info(self.vapi.cli("show nat44 sessions"))
self.logger.info(ppp("p1 packet:", p1))
self.logger.info(ppp("p2 packet:", p2))
self.logger.info(ppp("capture packet:", capture))
def test_tcp_session_open_retransmit1(self):
"""NAT44ED Open TCP session with SYN,ACK retransmit 1
The client does not receive the [SYN,ACK] or the
ACK from the client is lost. Therefore, the [SYN, ACK]
is retransmitted by the server.
"""
in_port = self.tcp_port_in
ext_port = self.tcp_external_port
payload = "H" * 10
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
)
# SYN 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="S")
)
p = self.send_and_expect(self.pg0, p, self.pg1)[0]
out_port = p[TCP].sport
# SYN + 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="SA")
)
self.send_and_expect(self.pg1, p, self.pg0)
# ACK in->out does not arrive
# resent SYN + 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="SA")
)
self.send_and_expect(self.pg1, p, self.pg0)
# 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")
)
self.send_and_expect(self.pg0, p, self.pg1)
# Verify that the data can be transmitted after the transitory time
self.virtual_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=in_port, dport=ext_port, flags="PA")
/ Raw(payload)
)
self.send_and_expect(self.pg0, p, self.pg1)
def test_tcp_session_open_retransmit2(self):
"""NAT44ED Open TCP session with SYN,ACK retransmit 2
The ACK is lost to the server after the TCP session is opened.
Data is sent by the client, then the [SYN,ACK] is
retransmitted by the server.
"""
in_port = self.tcp_port_in
ext_port = self.tcp_external_port
payload = "H" * 10
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
)
# SYN 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="S")
)
p = self.send_and_expect(self.pg0, p, self.pg1)[0]
out_port = p[TCP].sport
# SYN + 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="SA")
)
self.send_and_expect(self.pg1, p, self.pg0)
# ACK packet in->out -- not received by the server
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")
)
self.send_and_expect(self.pg0, p, self.pg1)
# PUSH + 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="PA")
/ Raw(payload)
)
self.send_and_expect(self.pg0, p, self.pg1)
# resent SYN + 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="SA")
)
self.send_and_expect(self.pg1, p, self.pg0)
# resent 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")
)
self.send_and_expect(self.pg0, p, self.pg1)
# resent PUSH + 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="PA")
/ Raw(payload)
)
self.send_and_expect(self.pg0, p, self.pg1)
# 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")
)
self.send_and_expect(self.pg1, p, self.pg0)
# Verify that the data can be transmitted after the transitory time
self.virtual_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=in_port, dport=ext_port, flags="PA")
/ Raw(payload)
)
self.send_and_expect(self.pg0, p, self.pg1)
def test_dynamic_ports_exhausted(self):
"""NAT44ED dynamic translation test: address ports exhaused"""
sessions_per_batch = 128
n_available_ports = 65536 - 1024
n_sessions = n_available_ports + 2 * sessions_per_batch
# set high enough session limit for ports to be exhausted
self.plugin_disable()
self.plugin_enable(max_sessions=n_sessions)
self.nat_add_inside_interface(self.pg0)
self.nat_add_outside_interface(self.pg1)
# set timeouts to high for sessions to reallistically expire
config = self.vapi.nat44_show_running_config()
old_timeouts = config.timeouts
self.vapi.nat_set_timeouts(
udp=21600,
tcp_established=old_timeouts.tcp_established,
tcp_transitory=old_timeouts.tcp_transitory,
icmp=old_timeouts.icmp,
)
# in2out after NAT addresses added
self.nat_add_address(self.nat_addr)
for i in range(n_sessions // sessions_per_batch):
pkts = self.create_udp_stream(
self.pg0,
self.pg1,
sessions_per_batch,
base_port=i * sessions_per_batch + 100,
)
self.pg0.add_stream(pkts)
self.pg_start()
err = self.statistics.get_err_counter(
"/err/nat44-ed-in2out-slowpath/out of ports"
)
if err > sessions_per_batch:
break
# Check for ports to be used no more than once
ports = set()
sessions = self.vapi.cli("show nat44 sessions")
rx = re.compile(
f" *o2i flow: match: saddr {self.pg1.remote_ip4} sport [0-9]+ daddr {self.nat_addr} dport ([0-9]+) proto UDP.*"
)
for line in sessions.splitlines():
m = rx.match(line)
if m:
port = int(m.groups()[0])
self.assertNotIn(port, ports)
ports.add(port)
self.assertGreaterEqual(err, sessions_per_batch)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)