ligang/vpp
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
vpp/test/test_nat44_ei.py
Dmitry Valter 34fa0ce8f7 tests: skip more excluded plugin tests 
Check and skip VPP_EXCLUDED_PLUGINS tests for most of plugins.

Type: improvement
Signed-off-by: Dmitry Valter <d-valter@yandex-team.com>
Change-Id: I23fd3666729251c639aa8da72a676058e3f5bb4e
2024-07-12 15:43:24 +00:00

4644 lines
171 KiB
Python
Raw Permalink Blame History

#!/usr/bin/env python3
import ipaddress
import random
import socket
import struct
import unittest
from io import BytesIO
import scapy.compat
from framework import VppTestCase, VppLoInterface
from asfframework import VppTestRunner, tag_fixme_debian11, is_distro_debian11
from ipfix import IPFIX, Set, Template, Data, IPFIXDecoder
from scapy.all import (
bind_layers,
Packet,
ByteEnumField,
ShortField,
IPField,
IntField,
LongField,
XByteField,
FlagsField,
FieldLenField,
PacketListField,
)
from scapy.data import IP_PROTOS
from scapy.layers.inet import IP, TCP, UDP, ICMP
from scapy.layers.inet import IPerror, TCPerror, UDPerror, ICMPerror
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply
from scapy.layers.l2 import Ether, ARP, GRE
from scapy.packet import Raw
from syslog_rfc5424_parser import SyslogMessage, ParseError
from syslog_rfc5424_parser.constants import SyslogSeverity
from util import ppp
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_neighbor import VppNeighbor
from vpp_papi import VppEnum
from config import config
# NAT HA protocol event data
class Event(Packet):
name = "Event"
fields_desc = [
ByteEnumField("event_type", None, {1: "add", 2: "del", 3: "refresh"}),
ByteEnumField("protocol", None, {0: "other", 1: "udp", 2: "tcp", 3: "icmp"}),
ShortField("flags", 0),
IPField("in_addr", None),
IPField("out_addr", None),
ShortField("in_port", None),
ShortField("out_port", None),
IPField("eh_addr", None),
IPField("ehn_addr", None),
ShortField("eh_port", None),
ShortField("ehn_port", None),
IntField("fib_index", None),
IntField("total_pkts", 0),
LongField("total_bytes", 0),
]
def extract_padding(self, s):
return "", s
# NAT HA protocol header
class HANATStateSync(Packet):
name = "HA NAT state sync"
fields_desc = [
XByteField("version", 1),
FlagsField("flags", 0, 8, ["ACK"]),
FieldLenField("count", None, count_of="events"),
IntField("sequence_number", 1),
IntField("thread_index", 0),
PacketListField("events", [], Event, count_from=lambda pkt: pkt.count),
]
class MethodHolder(VppTestCase):
"""NAT create capture and verify method holder"""
@property
def config_flags(self):
return VppEnum.vl_api_nat44_ei_config_flags_t
@property
def SYSLOG_SEVERITY(self):
return VppEnum.vl_api_syslog_severity_t
def nat44_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,
):
"""
Add/delete NAT44EI static mapping
:param local_ip: Local IP address
:param external_ip: External IP address
:param local_port: Local port number (Optional)
:param external_port: External port number (Optional)
:param vrf_id: VRF ID (Default 0)
:param is_add: 1 if add, 0 if delete (Default add)
:param external_sw_if_index: External interface instead of IP address
:param proto: IP protocol (Mandatory if port specified)
:param tag: Opaque string tag
:param flags: NAT configuration flags
"""
if not (local_port and external_port):
flags |= self.config_flags.NAT44_EI_ADDR_ONLY_MAPPING
self.vapi.nat44_ei_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,
)
def nat44_add_address(self, ip, is_add=1, vrf_id=0xFFFFFFFF):
"""
Add/delete NAT44EI address
:param ip: IP address
:param is_add: 1 if add, 0 if delete (Default add)
"""
self.vapi.nat44_ei_add_del_address_range(
first_ip_address=ip, last_ip_address=ip, vrf_id=vrf_id, is_add=is_add
)
def create_routes_and_neigbors(self):
r1 = VppIpRoute(
self,
self.pg7.remote_ip4,
32,
[VppRoutePath(self.pg7.remote_ip4, self.pg7.sw_if_index)],
)
r2 = VppIpRoute(
self,
self.pg8.remote_ip4,
32,
[VppRoutePath(self.pg8.remote_ip4, self.pg8.sw_if_index)],
)
r1.add_vpp_config()
r2.add_vpp_config()
n1 = VppNeighbor(
self,
self.pg7.sw_if_index,
self.pg7.remote_mac,
self.pg7.remote_ip4,
is_static=1,
)
n2 = VppNeighbor(
self,
self.pg8.sw_if_index,
self.pg8.remote_mac,
self.pg8.remote_ip4,
is_static=1,
)
n1.add_vpp_config()
n2.add_vpp_config()
def create_stream_in(self, in_if, out_if, dst_ip=None, ttl=64):
"""
Create packet stream for inside network
:param in_if: Inside interface
:param out_if: Outside interface
:param dst_ip: Destination address
:param ttl: TTL of generated packets
"""
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 compose_ip6(self, ip4, pref, plen):
"""
Compose IPv4-embedded IPv6 addresses
:param ip4: IPv4 address
:param pref: IPv6 prefix
:param plen: IPv6 prefix length
:returns: IPv4-embedded IPv6 addresses
"""
pref_n = list(socket.inet_pton(socket.AF_INET6, pref))
ip4_n = list(socket.inet_pton(socket.AF_INET, ip4))
if plen == 32:
pref_n[4] = ip4_n[0]
pref_n[5] = ip4_n[1]
pref_n[6] = ip4_n[2]
pref_n[7] = ip4_n[3]
elif plen == 40:
pref_n[5] = ip4_n[0]
pref_n[6] = ip4_n[1]
pref_n[7] = ip4_n[2]
pref_n[9] = ip4_n[3]
elif plen == 48:
pref_n[6] = ip4_n[0]
pref_n[7] = ip4_n[1]
pref_n[9] = ip4_n[2]
pref_n[10] = ip4_n[3]
elif plen == 56:
pref_n[7] = ip4_n[0]
pref_n[9] = ip4_n[1]
pref_n[10] = ip4_n[2]
pref_n[11] = ip4_n[3]
elif plen == 64:
pref_n[9] = ip4_n[0]
pref_n[10] = ip4_n[1]
pref_n[11] = ip4_n[2]
pref_n[12] = ip4_n[3]
elif plen == 96:
pref_n[12] = ip4_n[0]
pref_n[13] = ip4_n[1]
pref_n[14] = ip4_n[2]
pref_n[15] = ip4_n[3]
packed_pref_n = b"".join([scapy.compat.chb(x) for x in pref_n])
return socket.inet_ntop(socket.AF_INET6, packed_pref_n)
def create_stream_out(self, out_if, dst_ip=None, ttl=64, use_inside_ports=False):
"""
Create packet stream for outside network
:param out_if: Outside interface
:param dst_ip: Destination IP address (Default use global NAT address)
:param ttl: TTL of generated packets
:param use_inside_ports: Use inside NAT ports as destination ports
instead of outside ports
"""
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_stream_out_ip6(self, out_if, src_ip, dst_ip, hl=64):
"""
Create packet stream for outside network
:param out_if: Outside interface
:param dst_ip: Destination IP address (Default use global NAT address)
:param hl: HL of generated packets
"""
pkts = []
# TCP
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IPv6(src=src_ip, dst=dst_ip, hlim=hl)
/ TCP(dport=self.tcp_port_out, sport=20)
)
pkts.append(p)
# UDP
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IPv6(src=src_ip, dst=dst_ip, hlim=hl)
/ UDP(dport=self.udp_port_out, sport=20)
)
pkts.append(p)
# ICMP
p = (
Ether(dst=out_if.local_mac, src=out_if.remote_mac)
/ IPv6(src=src_ip, dst=dst_ip, hlim=hl)
/ ICMPv6EchoReply(id=self.icmp_id_out)
)
pkts.append(p)
return pkts
def verify_capture_out(
self,
capture,
nat_ip=None,
same_port=False,
dst_ip=None,
is_ip6=False,
ignore_port=False,
):
"""
Verify captured packets on outside network
:param capture: Captured packets
:param nat_ip: Translated IP address (Default use global NAT address)
:param same_port: Source port number is not translated (Default False)
:param dst_ip: Destination IP address (Default do not verify)
:param is_ip6: If L3 protocol is IPv6 (Default False)
"""
if is_ip6:
IP46 = IPv6
ICMP46 = ICMPv6EchoRequest
else:
IP46 = IP
ICMP46 = ICMP
if nat_ip is None:
nat_ip = self.nat_addr
for packet in capture:
try:
if not is_ip6:
self.assert_packet_checksums_valid(packet)
self.assertEqual(packet[IP46].src, nat_ip)
if dst_ip is not None:
self.assertEqual(packet[IP46].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[ICMP46].id, self.icmp_id_in)
else:
self.assertNotEqual(packet[ICMP46].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP46].id
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(
ppp("Unexpected or invalid packet (outside network):", packet)
)
raise
def verify_capture_out_ip6(self, capture, nat_ip, same_port=False, dst_ip=None):
"""
Verify captured packets on outside network
:param capture: Captured packets
:param nat_ip: Translated IP address
:param same_port: Source port number is not translated (Default False)
:param dst_ip: Destination IP address (Default do not verify)
"""
return self.verify_capture_out(capture, nat_ip, same_port, dst_ip, True)
def verify_capture_in(self, capture, in_if):
"""
Verify captured packets on inside network
:param capture: Captured packets
:param in_if: Inside interface
"""
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 verify_capture_no_translation(self, capture, ingress_if, egress_if):
"""
Verify captured packet that don't have to be translated
:param capture: Captured packets
:param ingress_if: Ingress interface
:param egress_if: Egress interface
"""
for packet in capture:
try:
self.assertEqual(packet[IP].src, ingress_if.remote_ip4)
self.assertEqual(packet[IP].dst, egress_if.remote_ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].sport, self.tcp_port_in)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].sport, 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 verify_capture_out_with_icmp_errors(self, capture, src_ip=None, icmp_type=11):
"""
Verify captured packets with ICMP errors on outside network
:param capture: Captured packets
:param src_ip: Translated IP address or IP address of VPP
(Default use global NAT address)
:param icmp_type: Type of error ICMP packet
we are expecting (Default 11)
"""
if src_ip is None:
src_ip = self.nat_addr
for packet in capture:
try:
self.assertEqual(packet[IP].src, src_ip)
self.assertEqual(packet.haslayer(ICMP), 1)
icmp = packet[ICMP]
self.assertEqual(icmp.type, icmp_type)
self.assertTrue(icmp.haslayer(IPerror))
inner_ip = icmp[IPerror]
if inner_ip.haslayer(TCPerror):
self.assertEqual(inner_ip[TCPerror].dport, self.tcp_port_out)
elif inner_ip.haslayer(UDPerror):
self.assertEqual(inner_ip[UDPerror].dport, self.udp_port_out)
else:
self.assertEqual(inner_ip[ICMPerror].id, self.icmp_id_out)
except:
self.logger.error(
ppp("Unexpected or invalid packet (outside network):", packet)
)
raise
def verify_capture_in_with_icmp_errors(self, capture, in_if, icmp_type=11):
"""
Verify captured packets with ICMP errors on inside network
:param capture: Captured packets
:param in_if: Inside interface
:param icmp_type: Type of error ICMP packet
we are expecting (Default 11)
"""
for packet in capture:
try:
self.assertEqual(packet[IP].dst, in_if.remote_ip4)
self.assertEqual(packet.haslayer(ICMP), 1)
icmp = packet[ICMP]
self.assertEqual(icmp.type, icmp_type)
self.assertTrue(icmp.haslayer(IPerror))
inner_ip = icmp[IPerror]
if inner_ip.haslayer(TCPerror):
self.assertEqual(inner_ip[TCPerror].sport, self.tcp_port_in)
elif inner_ip.haslayer(UDPerror):
self.assertEqual(inner_ip[UDPerror].sport, self.udp_port_in)
else:
self.assertEqual(inner_ip[ICMPerror].id, self.icmp_id_in)
except:
self.logger.error(
ppp("Unexpected or invalid packet (inside network):", packet)
)
raise
def create_stream_frag(
self, src_if, dst, sport, dport, data, proto=IP_PROTOS.tcp, echo_reply=False
):
"""
Create fragmented packet stream
:param src_if: Source interface
:param dst: Destination IPv4 address
:param sport: Source port
:param dport: Destination port
:param data: Payload data
:param proto: protocol (TCP, UDP, ICMP)
:param echo_reply: use echo_reply if protocol is ICMP
:returns: Fragments
"""
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 = random.randint(0, 65535)
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 reass_frags_and_verify(self, frags, src, dst):
"""
Reassemble and verify fragmented packet
:param frags: Captured fragments
:param src: Source IPv4 address to verify
:param dst: Destination IPv4 address to verify
:returns: Reassembled IPv4 packet
"""
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 verify_ipfix_nat44_ses(self, data):
"""
Verify IPFIX NAT44EI session create/delete event
:param data: Decoded IPFIX data records
"""
nat44_ses_create_num = 0
nat44_ses_delete_num = 0
self.assertEqual(6, len(data))
for record in data:
# natEvent
self.assertIn(scapy.compat.orb(record[230]), [4, 5])
if scapy.compat.orb(record[230]) == 4:
nat44_ses_create_num += 1
else:
nat44_ses_delete_num += 1
# sourceIPv4Address
self.assertEqual(self.pg0.remote_ip4, str(ipaddress.IPv4Address(record[8])))
# postNATSourceIPv4Address
self.assertEqual(
socket.inet_pton(socket.AF_INET, self.nat_addr), record[225]
)
# ingressVRFID
self.assertEqual(struct.pack("!I", 0), record[234])
# protocolIdentifier/sourceTransportPort
# /postNAPTSourceTransportPort
if IP_PROTOS.icmp == scapy.compat.orb(record[4]):
self.assertEqual(struct.pack("!H", self.icmp_id_in), record[7])
self.assertEqual(struct.pack("!H", self.icmp_id_out), record[227])
elif IP_PROTOS.tcp == scapy.compat.orb(record[4]):
self.assertEqual(struct.pack("!H", self.tcp_port_in), record[7])
self.assertEqual(struct.pack("!H", self.tcp_port_out), record[227])
elif IP_PROTOS.udp == scapy.compat.orb(record[4]):
self.assertEqual(struct.pack("!H", self.udp_port_in), record[7])
self.assertEqual(struct.pack("!H", self.udp_port_out), record[227])
else:
self.fail(f"Invalid protocol {scapy.compat.orb(record[4])}")
self.assertEqual(3, nat44_ses_create_num)
self.assertEqual(3, nat44_ses_delete_num)
def verify_ipfix_addr_exhausted(self, data):
self.assertEqual(1, len(data))
record = data[0]
# natEvent
self.assertEqual(scapy.compat.orb(record[230]), 3)
# natPoolID
self.assertEqual(struct.pack("!I", 0), record[283])
return len(data)
def verify_ipfix_max_sessions(self, data, limit):
self.assertEqual(1, len(data))
record = data[0]
# natEvent
self.assertEqual(scapy.compat.orb(record[230]), 13)
# natQuotaExceededEvent
self.assertEqual(struct.pack("!I", 1), record[466])
# maxSessionEntries
self.assertEqual(struct.pack("!I", limit), record[471])
return len(data)
def verify_no_nat44_user(self):
"""Verify that there is no NAT44EI user"""
users = self.vapi.nat44_ei_user_dump()
self.assertEqual(len(users), 0)
users = self.statistics["/nat44-ei/total-users"]
self.assertEqual(users[0][0], 0)
sessions = self.statistics["/nat44-ei/total-sessions"]
self.assertEqual(sessions[0][0], 0)
def verify_syslog_apmap(self, data, is_add=True):
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, "APMADD" if is_add else "APMDEL")
sd_params = message.sd.get("napmap")
self.assertTrue(sd_params is not None)
self.assertEqual(sd_params.get("IATYP"), "IPv4")
self.assertEqual(sd_params.get("ISADDR"), self.pg0.remote_ip4)
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.assertTrue(sd_params.get("SSUBIX") is not None)
self.assertEqual(sd_params.get("SVLAN"), "0")
def verify_mss_value(self, pkt, mss):
if not pkt.haslayer(IP) or not pkt.haslayer(TCP):
raise TypeError("Not a TCP/IP packet")
for option in pkt[TCP].options:
if option[0] == "MSS":
self.assertEqual(option[1], mss)
self.assert_tcp_checksum_valid(pkt)
@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")
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 = random.randint(1025, 65535)
# 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 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 = random.randint(1025, 65535)
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.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 get_nat44_ei_in2out_worker_index(ip, vpp_worker_count):
if 0 == vpp_worker_count:
return 0
numeric = socket.inet_aton(ip)
numeric = struct.unpack("!L", numeric)[0]
numeric = socket.htonl(numeric)
h = numeric + (numeric >> 8) + (numeric >> 16) + (numeric >> 24)
return 1 + h % vpp_worker_count
@tag_fixme_debian11
@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
class TestNAT44EI(MethodHolder):
"""NAT44EI Test Cases"""
max_translations = 10240
max_users = 10240
@classmethod
def setUpClass(cls):
super(TestNAT44EI, cls).setUpClass()
if is_distro_debian11 == True and not hasattr(cls, "vpp"):
return
cls.vapi.cli("set log class nat44-ei level debug")
cls.tcp_port_in = 6303
cls.tcp_port_out = 6303
cls.udp_port_in = 6304
cls.udp_port_out = 6304
cls.icmp_id_in = 6305
cls.icmp_id_out = 6305
cls.nat_addr = "10.0.0.3"
cls.ipfix_src_port = 4739
cls.ipfix_domain_id = 1
cls.tcp_external_port = 80
cls.udp_external_port = 69
cls.create_pg_interfaces(range(10))
cls.interfaces = list(cls.pg_interfaces[0:4])
for i in cls.interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
cls.pg0.generate_remote_hosts(3)
cls.pg0.configure_ipv4_neighbors()
cls.pg1.generate_remote_hosts(1)
cls.pg1.configure_ipv4_neighbors()
cls.overlapping_interfaces = list(list(cls.pg_interfaces[4:7]))
cls.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": 10})
cls.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": 20})
cls.pg4._local_ip4 = "172.16.255.1"
cls.pg4._remote_hosts[0]._ip4 = "172.16.255.2"
cls.pg4.set_table_ip4(10)
cls.pg5._local_ip4 = "172.17.255.3"
cls.pg5._remote_hosts[0]._ip4 = "172.17.255.4"
cls.pg5.set_table_ip4(10)
cls.pg6._local_ip4 = "172.16.255.1"
cls.pg6._remote_hosts[0]._ip4 = "172.16.255.2"
cls.pg6.set_table_ip4(20)
for i in cls.overlapping_interfaces:
i.config_ip4()
i.admin_up()
i.resolve_arp()
cls.pg7.admin_up()
cls.pg8.admin_up()
cls.pg9.generate_remote_hosts(2)
cls.pg9.config_ip4()
cls.vapi.sw_interface_add_del_address(
sw_if_index=cls.pg9.sw_if_index, prefix="10.0.0.1/24"
)
cls.pg9.admin_up()
cls.pg9.resolve_arp()
cls.pg9._remote_hosts[1]._ip4 = cls.pg9._remote_hosts[0]._ip4
cls.pg4._remote_ip4 = cls.pg9._remote_hosts[0]._ip4 = "10.0.0.2"
cls.pg9.resolve_arp()
def plugin_enable(self):
self.vapi.nat44_ei_plugin_enable_disable(
sessions=self.max_translations, users=self.max_users, enable=1
)
def setUp(self):
super(TestNAT44EI, self).setUp()
self.plugin_enable()
def tearDown(self):
super(TestNAT44EI, self).tearDown()
if not self.vpp_dead:
self.vapi.nat44_ei_ipfix_enable_disable(
domain_id=self.ipfix_domain_id, src_port=self.ipfix_src_port, enable=0
)
self.ipfix_src_port = 4739
self.ipfix_domain_id = 1
self.vapi.nat44_ei_plugin_enable_disable(enable=0)
self.vapi.cli("clear logging")
def test_clear_sessions(self):
"""NAT44EI session clearing test"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
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)
sessions = self.statistics["/nat44-ei/total-sessions"]
self.assertGreater(sessions[:, 0].sum(), 0, "Session count invalid")
self.logger.info("sessions before clearing: %s" % sessions[0][0])
self.vapi.cli("clear nat44 ei sessions")
sessions = self.statistics["/nat44-ei/total-sessions"]
self.assertEqual(sessions[:, 0].sum(), 0, "Session count invalid")
self.logger.info("sessions after clearing: %s" % sessions[0][0])
def test_dynamic(self):
"""NAT44EI dynamic translation test"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# in2out
tcpn = self.statistics["/nat44-ei/in2out/slowpath/tcp"]
udpn = self.statistics["/nat44-ei/in2out/slowpath/udp"]
icmpn = self.statistics["/nat44-ei/in2out/slowpath/icmp"]
drops = self.statistics["/nat44-ei/in2out/slowpath/drops"]
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)
if_idx = self.pg0.sw_if_index
cnt = self.statistics["/nat44-ei/in2out/slowpath/tcp"]
self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
cnt = self.statistics["/nat44-ei/in2out/slowpath/udp"]
self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
cnt = self.statistics["/nat44-ei/in2out/slowpath/icmp"]
self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
cnt = self.statistics["/nat44-ei/in2out/slowpath/drops"]
self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
# out2in
tcpn = self.statistics["/nat44-ei/out2in/slowpath/tcp"]
udpn = self.statistics["/nat44-ei/out2in/slowpath/udp"]
icmpn = self.statistics["/nat44-ei/out2in/slowpath/icmp"]
drops = self.statistics["/nat44-ei/out2in/slowpath/drops"]
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)
if_idx = self.pg1.sw_if_index
cnt = self.statistics["/nat44-ei/out2in/slowpath/tcp"]
self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
cnt = self.statistics["/nat44-ei/out2in/slowpath/udp"]
self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
cnt = self.statistics["/nat44-ei/out2in/slowpath/icmp"]
self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
cnt = self.statistics["/nat44-ei/out2in/slowpath/drops"]
self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
users = self.statistics["/nat44-ei/total-users"]
self.assertEqual(users[:, 0].sum(), 1)
sessions = self.statistics["/nat44-ei/total-sessions"]
self.assertEqual(sessions[:, 0].sum(), 3)
def test_dynamic_icmp_errors_in2out_ttl_1(self):
"""NAT44EI handling of client packets with TTL=1"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# Client side - generate traffic
pkts = self.create_stream_in(self.pg0, self.pg1, ttl=1)
capture = self.send_and_expect_some(self.pg0, pkts, self.pg0)
# Client side - verify ICMP type 11 packets
self.verify_capture_in_with_icmp_errors(capture, self.pg0)
def test_dynamic_icmp_errors_out2in_ttl_1(self):
"""NAT44EI handling of server packets with TTL=1"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# Client side - create sessions
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Server side - generate traffic
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture)
pkts = self.create_stream_out(self.pg1, ttl=1)
capture = self.send_and_expect_some(self.pg1, pkts, self.pg1)
# Server side - verify ICMP type 11 packets
self.verify_capture_out_with_icmp_errors(capture, src_ip=self.pg1.local_ip4)
def test_dynamic_icmp_errors_in2out_ttl_2(self):
"""NAT44EI handling of error responses to client packets with TTL=2"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# Client side - generate traffic
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()
# Server side - simulate ICMP type 11 response
capture = self.pg1.get_capture(len(pkts))
pkts = [
Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr)
/ ICMP(type=11)
/ packet[IP]
for packet in capture
]
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Client side - verify ICMP type 11 packets
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in_with_icmp_errors(capture, self.pg0)
def test_dynamic_icmp_errors_out2in_ttl_2(self):
"""NAT44EI handling of error responses to server packets with TTL=2"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# Client side - create sessions
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Server side - generate traffic
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture)
pkts = self.create_stream_out(self.pg1, ttl=2)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Client side - simulate ICMP type 11 response
capture = self.pg0.get_capture(len(pkts))
pkts = [
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)
/ packet[IP]
for packet in capture
]
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Server side - verify ICMP type 11 packets
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out_with_icmp_errors(capture)
def test_ping_out_interface_from_outside(self):
"""NAT44EI ping out interface from outside network"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_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.pg1.local_ip4)
/ ICMP(id=self.icmp_id_out, type="echo-request")
)
pkts = [p]
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
packet = capture[0]
try:
self.assertEqual(packet[IP].src, self.pg1.local_ip4)
self.assertEqual(packet[IP].dst, self.pg1.remote_ip4)
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
self.assertEqual(packet[ICMP].type, 0) # echo reply
except:
self.logger.error(
ppp("Unexpected or invalid packet (outside network):", packet)
)
raise
def test_ping_internal_host_from_outside(self):
"""NAT44EI ping internal host from outside network"""
self.nat44_add_static_mapping(self.pg0.remote_ip4, self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# out2in
pkt = (
Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.nat_addr, ttl=64)
/ ICMP(id=self.icmp_id_out, type="echo-request")
)
self.pg1.add_stream(pkt)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(1)
self.verify_capture_in(capture, self.pg0)
self.assert_equal(capture[0][IP].proto, IP_PROTOS.icmp)
# in2out
pkt = (
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=self.icmp_id_in, type="echo-reply")
)
self.pg0.add_stream(pkt)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
self.verify_capture_out(capture, same_port=True)
self.assert_equal(capture[0][IP].proto, IP_PROTOS.icmp)
def test_forwarding(self):
"""NAT44EI forwarding test"""
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_forwarding_enable_disable(enable=1)
real_ip = self.pg0.remote_ip4
alias_ip = self.nat_addr
flags = self.config_flags.NAT44_EI_ADDR_ONLY_MAPPING
self.vapi.nat44_ei_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:
# 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)
# 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
finally:
self.vapi.nat44_ei_forwarding_enable_disable(enable=0)
flags = self.config_flags.NAT44_EI_ADDR_ONLY_MAPPING
self.vapi.nat44_ei_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_static_in(self):
"""NAT44EI 1:1 NAT initialized from inside network"""
nat_ip = "10.0.0.10"
self.tcp_port_out = 6303
self.udp_port_out = 6304
self.icmp_id_out = 6305
self.nat44_add_static_mapping(self.pg0.remote_ip4, nat_ip)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
sm = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(len(sm), 1)
self.assertEqual(sm[0].tag, "")
self.assertEqual(sm[0].protocol, 0)
self.assertEqual(sm[0].local_port, 0)
self.assertEqual(sm[0].external_port, 0)
# 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, nat_ip, True)
# out2in
pkts = self.create_stream_out(self.pg1, nat_ip)
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_static_out(self):
"""NAT44EI 1:1 NAT initialized from outside network"""
nat_ip = "10.0.0.20"
self.tcp_port_out = 6303
self.udp_port_out = 6304
self.icmp_id_out = 6305
tag = "testTAG"
self.nat44_add_static_mapping(self.pg0.remote_ip4, nat_ip, tag=tag)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
sm = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(len(sm), 1)
self.assertEqual(sm[0].tag, tag)
# out2in
pkts = self.create_stream_out(self.pg1, nat_ip)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1)
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, True)
def test_static_with_port_in(self):
"""NAT44EI 1:1 NAPT initialized from inside network"""
self.tcp_port_out = 3606
self.udp_port_out = 3607
self.icmp_id_out = 3608
self.nat44_add_address(self.nat_addr)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.tcp_port_in,
self.tcp_port_out,
proto=IP_PROTOS.tcp,
)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.udp_port_in,
self.udp_port_out,
proto=IP_PROTOS.udp,
)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.icmp_id_in,
self.icmp_id_out,
proto=IP_PROTOS.icmp,
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture)
# 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)
def test_static_with_port_out(self):
"""NAT44EI 1:1 NAPT initialized from outside network"""
self.tcp_port_out = 30606
self.udp_port_out = 30607
self.icmp_id_out = 30608
self.nat44_add_address(self.nat_addr)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.tcp_port_in,
self.tcp_port_out,
proto=IP_PROTOS.tcp,
)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.udp_port_in,
self.udp_port_out,
proto=IP_PROTOS.udp,
)
self.nat44_add_static_mapping(
self.pg0.remote_ip4,
self.nat_addr,
self.icmp_id_in,
self.icmp_id_out,
proto=IP_PROTOS.icmp,
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# out2in
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg1)
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)
def test_static_vrf_aware(self):
"""NAT44EI 1:1 NAT VRF awareness"""
nat_ip1 = "10.0.0.30"
nat_ip2 = "10.0.0.40"
self.tcp_port_out = 6303
self.udp_port_out = 6304
self.icmp_id_out = 6305
self.nat44_add_static_mapping(self.pg4.remote_ip4, nat_ip1, vrf_id=10)
self.nat44_add_static_mapping(self.pg0.remote_ip4, nat_ip2, vrf_id=10)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg3.sw_if_index, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg4.sw_if_index, flags=flags, is_add=1
)
# inside interface VRF match NAT44EI static mapping VRF
pkts = self.create_stream_in(self.pg4, self.pg3)
self.pg4.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip1, True)
# inside interface VRF don't match NAT44EI static mapping VRF (packets
# are dropped)
pkts = self.create_stream_in(self.pg0, self.pg3)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg3.assert_nothing_captured()
def test_dynamic_to_static(self):
"""NAT44EI Switch from dynamic translation to 1:1NAT"""
nat_ip = "10.0.0.10"
self.tcp_port_out = 6303
self.udp_port_out = 6304
self.icmp_id_out = 6305
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# dynamic
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)
# 1:1NAT
self.nat44_add_static_mapping(self.pg0.remote_ip4, nat_ip)
sessions = self.vapi.nat44_ei_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions), 0)
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, True)
def test_identity_nat(self):
"""NAT44EI Identity NAT"""
flags = self.config_flags.NAT44_EI_ADDR_ONLY_MAPPING
self.vapi.nat44_ei_add_del_identity_mapping(
ip_address=self.pg0.remote_ip4,
sw_if_index=0xFFFFFFFF,
flags=flags,
is_add=1,
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
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=12345, dport=56789)
)
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(ip.src, self.pg1.remote_ip4)
self.assertEqual(tcp.dport, 56789)
self.assertEqual(tcp.sport, 12345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
sessions = self.vapi.nat44_ei_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(len(sessions), 0)
flags = self.config_flags.NAT44_EI_ADDR_ONLY_MAPPING
self.vapi.nat44_ei_add_del_identity_mapping(
ip_address=self.pg0.remote_ip4,
sw_if_index=0xFFFFFFFF,
flags=flags,
vrf_id=1,
is_add=1,
)
identity_mappings = self.vapi.nat44_ei_identity_mapping_dump()
self.assertEqual(len(identity_mappings), 2)
def test_multiple_inside_interfaces(self):
"""NAT44EI multiple non-overlapping address space inside interfaces"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg3.sw_if_index, is_add=1
)
# between two NAT44EI inside interfaces (no translation)
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_no_translation(capture, self.pg0, self.pg1)
# from inside to interface without translation
pkts = self.create_stream_in(self.pg0, self.pg2)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_no_translation(capture, self.pg0, self.pg2)
# in2out 1st interface
pkts = self.create_stream_in(self.pg0, self.pg3)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture)
# out2in 1st interface
pkts = self.create_stream_out(self.pg3)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
# in2out 2nd interface
pkts = self.create_stream_in(self.pg1, self.pg3)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture)
# out2in 2nd interface
pkts = self.create_stream_out(self.pg3)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg1)
def test_inside_overlapping_interfaces(self):
"""NAT44EI multiple inside interfaces with overlapping address space"""
static_nat_ip = "10.0.0.10"
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg3.sw_if_index, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg4.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg5.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg6.sw_if_index, flags=flags, is_add=1
)
self.nat44_add_static_mapping(self.pg6.remote_ip4, static_nat_ip, vrf_id=20)
# between NAT44EI inside interfaces with same VRF (no translation)
pkts = self.create_stream_in(self.pg4, self.pg5)
self.pg4.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(len(pkts))
self.verify_capture_no_translation(capture, self.pg4, self.pg5)
# between NAT44EI inside interfaces with different VRF (hairpinning)
p = (
Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac)
/ IP(src=self.pg4.remote_ip4, dst=static_nat_ip)
/ TCP(sport=1234, dport=5678)
)
self.pg4.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.nat_addr)
self.assertEqual(ip.dst, self.pg6.remote_ip4)
self.assertNotEqual(tcp.sport, 1234)
self.assertEqual(tcp.dport, 5678)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# in2out 1st interface
pkts = self.create_stream_in(self.pg4, self.pg3)
self.pg4.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture)
# out2in 1st interface
pkts = self.create_stream_out(self.pg3)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg4.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg4)
# in2out 2nd interface
pkts = self.create_stream_in(self.pg5, self.pg3)
self.pg5.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture)
# out2in 2nd interface
pkts = self.create_stream_out(self.pg3)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg5.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg5)
# pg5 session dump
addresses = self.vapi.nat44_ei_address_dump()
self.assertEqual(len(addresses), 1)
sessions = self.vapi.nat44_ei_user_session_dump(self.pg5.remote_ip4, 10)
self.assertEqual(len(sessions), 3)
for session in sessions:
self.assertFalse(session.flags & self.config_flags.NAT44_EI_STATIC_MAPPING)
self.assertEqual(str(session.inside_ip_address), self.pg5.remote_ip4)
self.assertEqual(session.outside_ip_address, addresses[0].ip_address)
self.assertEqual(sessions[0].protocol, IP_PROTOS.tcp)
self.assertEqual(sessions[1].protocol, IP_PROTOS.udp)
self.assertEqual(sessions[2].protocol, IP_PROTOS.icmp)
self.assertEqual(sessions[0].inside_port, self.tcp_port_in)
self.assertEqual(sessions[1].inside_port, self.udp_port_in)
self.assertEqual(sessions[2].inside_port, self.icmp_id_in)
self.assertEqual(sessions[0].outside_port, self.tcp_port_out)
self.assertEqual(sessions[1].outside_port, self.udp_port_out)
self.assertEqual(sessions[2].outside_port, self.icmp_id_out)
# in2out 3rd interface
pkts = self.create_stream_in(self.pg6, self.pg3)
self.pg6.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture, static_nat_ip, True)
# out2in 3rd interface
pkts = self.create_stream_out(self.pg3, static_nat_ip)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg6)
# general user and session dump verifications
users = self.vapi.nat44_ei_user_dump()
self.assertGreaterEqual(len(users), 3)
addresses = self.vapi.nat44_ei_address_dump()
self.assertEqual(len(addresses), 1)
for user in users:
sessions = self.vapi.nat44_ei_user_session_dump(
user.ip_address, user.vrf_id
)
for session in sessions:
self.assertEqual(user.ip_address, session.inside_ip_address)
self.assertTrue(session.total_bytes > session.total_pkts > 0)
self.assertTrue(
session.protocol in [IP_PROTOS.tcp, IP_PROTOS.udp, IP_PROTOS.icmp]
)
# pg4 session dump
sessions = self.vapi.nat44_ei_user_session_dump(self.pg4.remote_ip4, 10)
self.assertGreaterEqual(len(sessions), 4)
for session in sessions:
self.assertFalse(session.flags & self.config_flags.NAT44_EI_STATIC_MAPPING)
self.assertEqual(str(session.inside_ip_address), self.pg4.remote_ip4)
self.assertEqual(session.outside_ip_address, addresses[0].ip_address)
# pg6 session dump
sessions = self.vapi.nat44_ei_user_session_dump(self.pg6.remote_ip4, 20)
self.assertGreaterEqual(len(sessions), 3)
for session in sessions:
self.assertTrue(session.flags & self.config_flags.NAT44_EI_STATIC_MAPPING)
self.assertEqual(str(session.inside_ip_address), self.pg6.remote_ip4)
self.assertEqual(str(session.outside_ip_address), static_nat_ip)
self.assertTrue(
session.inside_port
in [self.tcp_port_in, self.udp_port_in, self.icmp_id_in]
)
def test_hairpinning(self):
"""NAT44EI hairpinning - 1:1 NAPT"""
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_in_port = 1234
host_out_port = 0
server_in_port = 5678
server_out_port = 8765
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for server
self.nat44_add_static_mapping(
server.ip4,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.tcp,
)
cnt = self.statistics["/nat44-ei/hairpinning"]
# send packet from host to server
p = (
Ether(src=host.mac, dst=self.pg0.local_mac)
/ IP(src=host.ip4, dst=self.nat_addr)
/ TCP(sport=host_in_port, dport=server_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, server.ip4)
self.assertNotEqual(tcp.sport, host_in_port)
self.assertEqual(tcp.dport, server_in_port)
self.assert_packet_checksums_valid(p)
host_out_port = tcp.sport
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(after[:, if_idx].sum() - cnt[:, if_idx].sum(), 1)
# send reply from server to host
p = (
Ether(src=server.mac, dst=self.pg0.local_mac)
/ IP(src=server.ip4, dst=self.nat_addr)
/ TCP(sport=server_in_port, dport=host_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, host.ip4)
self.assertEqual(tcp.sport, server_out_port)
self.assertEqual(tcp.dport, host_in_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(
after[:, if_idx].sum() - cnt[:, if_idx].sum(),
2 + (1 if self.vpp_worker_count > 0 else 0),
)
def test_hairpinning2(self):
"""NAT44EI hairpinning - 1:1 NAT"""
server1_nat_ip = "10.0.0.10"
server2_nat_ip = "10.0.0.11"
host = self.pg0.remote_hosts[0]
server1 = self.pg0.remote_hosts[1]
server2 = self.pg0.remote_hosts[2]
server_tcp_port = 22
server_udp_port = 20
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for servers
self.nat44_add_static_mapping(server1.ip4, server1_nat_ip)
self.nat44_add_static_mapping(server2.ip4, server2_nat_ip)
# host to server1
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ TCP(sport=self.tcp_port_in, dport=server_tcp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ UDP(sport=self.udp_port_in, dport=server_udp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ ICMP(id=self.icmp_id_in, type="echo-request")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, self.nat_addr)
self.assertEqual(packet[IP].dst, server1.ip4)
if packet.haslayer(TCP):
self.assertNotEqual(packet[TCP].sport, self.tcp_port_in)
self.assertEqual(packet[TCP].dport, server_tcp_port)
self.tcp_port_out = packet[TCP].sport
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertNotEqual(packet[UDP].sport, self.udp_port_in)
self.assertEqual(packet[UDP].dport, server_udp_port)
self.udp_port_out = packet[UDP].sport
else:
self.assertNotEqual(packet[ICMP].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP].id
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server1 to host
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ TCP(sport=server_tcp_port, dport=self.tcp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ UDP(sport=server_udp_port, dport=self.udp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ ICMP(id=self.icmp_id_out, type="echo-reply")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server1_nat_ip)
self.assertEqual(packet[IP].dst, host.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].dport, self.tcp_port_in)
self.assertEqual(packet[TCP].sport, server_tcp_port)
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].dport, self.udp_port_in)
self.assertEqual(packet[UDP].sport, server_udp_port)
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server2 to server1
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ TCP(sport=self.tcp_port_in, dport=server_tcp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ UDP(sport=self.udp_port_in, dport=server_udp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ ICMP(id=self.icmp_id_in, type="echo-request")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server2_nat_ip)
self.assertEqual(packet[IP].dst, server1.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].sport, self.tcp_port_in)
self.assertEqual(packet[TCP].dport, server_tcp_port)
self.tcp_port_out = packet[TCP].sport
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].sport, self.udp_port_in)
self.assertEqual(packet[UDP].dport, server_udp_port)
self.udp_port_out = packet[UDP].sport
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP].id
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server1 to server2
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ TCP(sport=server_tcp_port, dport=self.tcp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ UDP(sport=server_udp_port, dport=self.udp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ ICMP(id=self.icmp_id_out, type="echo-reply")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server1_nat_ip)
self.assertEqual(packet[IP].dst, server2.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].dport, self.tcp_port_in)
self.assertEqual(packet[TCP].sport, server_tcp_port)
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].dport, self.udp_port_in)
self.assertEqual(packet[UDP].sport, server_udp_port)
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
def test_hairpinning_avoid_inf_loop(self):
"""NAT44EI hairpinning - 1:1 NAPT avoid infinite loop"""
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_in_port = 1234
host_out_port = 0
server_in_port = 5678
server_out_port = 8765
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for server
self.nat44_add_static_mapping(
server.ip4,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.tcp,
)
# add another static mapping that maps pg0.local_ip4 address to itself
self.nat44_add_static_mapping(self.pg0.local_ip4, self.pg0.local_ip4)
# send packet from host to VPP (the packet should get dropped)
p = (
Ether(src=host.mac, dst=self.pg0.local_mac)
/ IP(src=host.ip4, dst=self.pg0.local_ip4)
/ TCP(sport=host_in_port, dport=server_out_port)
)
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# Here VPP used to crash due to an infinite loop
cnt = self.statistics["/nat44-ei/hairpinning"]
# send packet from host to server
p = (
Ether(src=host.mac, dst=self.pg0.local_mac)
/ IP(src=host.ip4, dst=self.nat_addr)
/ TCP(sport=host_in_port, dport=server_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, server.ip4)
self.assertNotEqual(tcp.sport, host_in_port)
self.assertEqual(tcp.dport, server_in_port)
self.assert_packet_checksums_valid(p)
host_out_port = tcp.sport
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(after[:, if_idx].sum() - cnt[:, if_idx].sum(), 1)
# send reply from server to host
p = (
Ether(src=server.mac, dst=self.pg0.local_mac)
/ IP(src=server.ip4, dst=self.nat_addr)
/ TCP(sport=server_in_port, dport=host_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, host.ip4)
self.assertEqual(tcp.sport, server_out_port)
self.assertEqual(tcp.dport, host_in_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(
after[:, if_idx].sum() - cnt[:, if_idx].sum(),
2 + (1 if self.vpp_worker_count > 0 else 0),
)
def test_interface_addr(self):
"""NAT44EI acquire addresses from interface"""
self.vapi.nat44_ei_add_del_interface_addr(
is_add=1, sw_if_index=self.pg7.sw_if_index
)
# no address in NAT pool
addresses = self.vapi.nat44_ei_address_dump()
self.assertEqual(0, len(addresses))
# configure interface address and check NAT address pool
self.pg7.config_ip4()
addresses = self.vapi.nat44_ei_address_dump()
self.assertEqual(1, len(addresses))
self.assertEqual(str(addresses[0].ip_address), self.pg7.local_ip4)
# remove interface address and check NAT address pool
self.pg7.unconfig_ip4()
addresses = self.vapi.nat44_ei_address_dump()
self.assertEqual(0, len(addresses))
def test_interface_addr_static_mapping(self):
"""NAT44EI Static mapping with addresses from interface"""
tag = "testTAG"
self.vapi.nat44_ei_add_del_interface_addr(
is_add=1, sw_if_index=self.pg7.sw_if_index
)
self.nat44_add_static_mapping(
"1.2.3.4", external_sw_if_index=self.pg7.sw_if_index, tag=tag
)
# static mappings with external interface
static_mappings = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(1, len(static_mappings))
self.assertEqual(self.pg7.sw_if_index, static_mappings[0].external_sw_if_index)
self.assertEqual(static_mappings[0].tag, tag)
# configure interface address and check static mappings
self.pg7.config_ip4()
static_mappings = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(2, len(static_mappings))
resolved = False
for sm in static_mappings:
if sm.external_sw_if_index == 0xFFFFFFFF:
self.assertEqual(str(sm.external_ip_address), self.pg7.local_ip4)
self.assertEqual(sm.tag, tag)
resolved = True
self.assertTrue(resolved)
# remove interface address and check static mappings
self.pg7.unconfig_ip4()
static_mappings = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(1, len(static_mappings))
self.assertEqual(self.pg7.sw_if_index, static_mappings[0].external_sw_if_index)
self.assertEqual(static_mappings[0].tag, tag)
# configure interface address again and check static mappings
self.pg7.config_ip4()
static_mappings = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(2, len(static_mappings))
resolved = False
for sm in static_mappings:
if sm.external_sw_if_index == 0xFFFFFFFF:
self.assertEqual(str(sm.external_ip_address), self.pg7.local_ip4)
self.assertEqual(sm.tag, tag)
resolved = True
self.assertTrue(resolved)
# remove static mapping
self.nat44_add_static_mapping(
"1.2.3.4", external_sw_if_index=self.pg7.sw_if_index, tag=tag, is_add=0
)
static_mappings = self.vapi.nat44_ei_static_mapping_dump()
self.assertEqual(0, len(static_mappings))
def test_interface_addr_identity_nat(self):
"""NAT44EI Identity NAT with addresses from interface"""
port = 53053
self.vapi.nat44_ei_add_del_interface_addr(
is_add=1, sw_if_index=self.pg7.sw_if_index
)
self.vapi.nat44_ei_add_del_identity_mapping(
ip_address=b"0",
sw_if_index=self.pg7.sw_if_index,
port=port,
protocol=IP_PROTOS.tcp,
is_add=1,
)
# identity mappings with external interface
identity_mappings = self.vapi.nat44_ei_identity_mapping_dump()
self.assertEqual(1, len(identity_mappings))
self.assertEqual(self.pg7.sw_if_index, identity_mappings[0].sw_if_index)
# configure interface address and check identity mappings
self.pg7.config_ip4()
identity_mappings = self.vapi.nat44_ei_identity_mapping_dump()
resolved = False
self.assertEqual(2, len(identity_mappings))
for sm in identity_mappings:
if sm.sw_if_index == 0xFFFFFFFF:
self.assertEqual(
str(identity_mappings[0].ip_address), self.pg7.local_ip4
)
self.assertEqual(port, identity_mappings[0].port)
self.assertEqual(IP_PROTOS.tcp, identity_mappings[0].protocol)
resolved = True
self.assertTrue(resolved)
# remove interface address and check identity mappings
self.pg7.unconfig_ip4()
identity_mappings = self.vapi.nat44_ei_identity_mapping_dump()
self.assertEqual(1, len(identity_mappings))
self.assertEqual(self.pg7.sw_if_index, identity_mappings[0].sw_if_index)
def test_ipfix_nat44_sess(self):
"""NAT44EI IPFIX logging NAT44EI session created/deleted"""
self.ipfix_domain_id = 10
self.ipfix_src_port = 20202
collector_port = 30303
bind_layers(UDP, IPFIX, dport=30303)
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.set_ipfix_exporter(
collector_address=self.pg3.remote_ip4,
src_address=self.pg3.local_ip4,
path_mtu=512,
template_interval=10,
collector_port=collector_port,
)
self.vapi.nat44_ei_ipfix_enable_disable(
domain_id=self.ipfix_domain_id, src_port=self.ipfix_src_port, enable=1
)
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)
self.nat44_add_address(self.nat_addr, is_add=0)
self.vapi.ipfix_flush()
capture = self.pg3.get_capture(7)
ipfix = IPFIXDecoder()
# first load template
for p in capture:
self.assertTrue(p.haslayer(IPFIX))
self.assertEqual(p[IP].src, self.pg3.local_ip4)
self.assertEqual(p[IP].dst, self.pg3.remote_ip4)
self.assertEqual(p[UDP].sport, self.ipfix_src_port)
self.assertEqual(p[UDP].dport, collector_port)
self.assertEqual(p[IPFIX].observationDomainID, self.ipfix_domain_id)
if p.haslayer(Template):
ipfix.add_template(p.getlayer(Template))
# verify events in data set
for p in capture:
if p.haslayer(Data):
data = ipfix.decode_data_set(p.getlayer(Set))
self.verify_ipfix_nat44_ses(data)
def test_ipfix_addr_exhausted(self):
"""NAT44EI IPFIX logging NAT addresses exhausted"""
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.set_ipfix_exporter(
collector_address=self.pg3.remote_ip4,
src_address=self.pg3.local_ip4,
path_mtu=512,
template_interval=10,
)
self.vapi.nat44_ei_ipfix_enable_disable(
domain_id=self.ipfix_domain_id, src_port=self.ipfix_src_port, enable=1
)
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=3025)
) * 3
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
self.vapi.ipfix_flush()
capture = self.pg3.get_capture(7)
ipfix = IPFIXDecoder()
# first load template
for p in capture:
self.assertTrue(p.haslayer(IPFIX))
self.assertEqual(p[IP].src, self.pg3.local_ip4)
self.assertEqual(p[IP].dst, self.pg3.remote_ip4)
self.assertEqual(p[UDP].sport, self.ipfix_src_port)
self.assertEqual(p[UDP].dport, 4739)
self.assertEqual(p[IPFIX].observationDomainID, self.ipfix_domain_id)
if p.haslayer(Template):
ipfix.add_template(p.getlayer(Template))
# verify events in data set
event_count = 0
for p in capture:
if p.haslayer(Data):
data = ipfix.decode_data_set(p.getlayer(Set))
event_count += self.verify_ipfix_addr_exhausted(data)
self.assertEqual(event_count, 1)
def test_ipfix_max_sessions(self):
"""NAT44EI IPFIX logging maximum session entries exceeded"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
max_sessions_per_thread = self.max_translations
max_sessions = max(1, self.vpp_worker_count) * max_sessions_per_thread
pkts = []
for i in range(0, max_sessions):
src = "10.10.%u.%u" % ((i & 0xFF00) >> 8, i & 0xFF)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=src, dst=self.pg1.remote_ip4)
/ TCP(sport=1025)
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(max_sessions)
self.vapi.set_ipfix_exporter(
collector_address=self.pg3.remote_ip4,
src_address=self.pg3.local_ip4,
path_mtu=512,
template_interval=10,
)
self.vapi.nat44_ei_ipfix_enable_disable(
domain_id=self.ipfix_domain_id, src_port=self.ipfix_src_port, enable=1
)
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=1025)
) * 3
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
self.vapi.ipfix_flush()
capture = self.pg3.get_capture(7)
ipfix = IPFIXDecoder()
# first load template
for p in capture:
self.assertTrue(p.haslayer(IPFIX))
self.assertEqual(p[IP].src, self.pg3.local_ip4)
self.assertEqual(p[IP].dst, self.pg3.remote_ip4)
self.assertEqual(p[UDP].sport, self.ipfix_src_port)
self.assertEqual(p[UDP].dport, 4739)
self.assertEqual(p[IPFIX].observationDomainID, self.ipfix_domain_id)
if p.haslayer(Template):
ipfix.add_template(p.getlayer(Template))
# verify events in data set
event_count = 0
for p in capture:
if p.haslayer(Data):
data = ipfix.decode_data_set(p.getlayer(Set))
event_count += self.verify_ipfix_max_sessions(
data, max_sessions_per_thread
)
self.assertEqual(event_count, 1)
def test_syslog_apmap(self):
"""NAT44EI syslog address and port mapping 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.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
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()
capture = self.pg1.get_capture(1)
self.tcp_port_out = capture[0][TCP].sport
capture = self.pg3.get_capture(1)
self.verify_syslog_apmap(capture[0][Raw].load)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.nat44_add_address(self.nat_addr, is_add=0)
capture = self.pg3.get_capture(1)
self.verify_syslog_apmap(capture[0][Raw].load, False)
def test_pool_addr_fib(self):
"""NAT44EI add pool addresses to FIB"""
static_addr = "10.0.0.10"
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.nat44_add_static_mapping(self.pg0.remote_ip4, static_addr)
# NAT44EI address
p = Ether(src=self.pg1.remote_mac, dst="ff:ff:ff:ff:ff:ff") / ARP(
op=ARP.who_has,
pdst=self.nat_addr,
psrc=self.pg1.remote_ip4,
hwsrc=self.pg1.remote_mac,
)
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
self.assertTrue(capture[0].haslayer(ARP))
self.assertTrue(capture[0][ARP].op, ARP.is_at)
# 1:1 NAT address
p = Ether(src=self.pg1.remote_mac, dst="ff:ff:ff:ff:ff:ff") / ARP(
op=ARP.who_has,
pdst=static_addr,
psrc=self.pg1.remote_ip4,
hwsrc=self.pg1.remote_mac,
)
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
self.assertTrue(capture[0].haslayer(ARP))
self.assertTrue(capture[0][ARP].op, ARP.is_at)
# send ARP to non-NAT44EI interface
p = Ether(src=self.pg2.remote_mac, dst="ff:ff:ff:ff:ff:ff") / ARP(
op=ARP.who_has,
pdst=self.nat_addr,
psrc=self.pg2.remote_ip4,
hwsrc=self.pg2.remote_mac,
)
self.pg2.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
# remove addresses and verify
self.nat44_add_address(self.nat_addr, is_add=0)
self.nat44_add_static_mapping(self.pg0.remote_ip4, static_addr, is_add=0)
p = Ether(src=self.pg1.remote_mac, dst="ff:ff:ff:ff:ff:ff") / ARP(
op=ARP.who_has,
pdst=self.nat_addr,
psrc=self.pg1.remote_ip4,
hwsrc=self.pg1.remote_mac,
)
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
p = Ether(src=self.pg1.remote_mac, dst="ff:ff:ff:ff:ff:ff") / ARP(
op=ARP.who_has,
pdst=static_addr,
psrc=self.pg1.remote_ip4,
hwsrc=self.pg1.remote_mac,
)
self.pg1.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.assert_nothing_captured()
def test_vrf_mode(self):
"""NAT44EI tenant VRF aware address pool mode"""
vrf_id1 = 1
vrf_id2 = 2
nat_ip1 = "10.0.0.10"
nat_ip2 = "10.0.0.11"
self.pg0.unconfig_ip4()
self.pg1.unconfig_ip4()
self.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": vrf_id1})
self.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": vrf_id2})
self.pg0.set_table_ip4(vrf_id1)
self.pg1.set_table_ip4(vrf_id2)
self.pg0.config_ip4()
self.pg1.config_ip4()
self.pg0.resolve_arp()
self.pg1.resolve_arp()
self.nat44_add_address(nat_ip1, vrf_id=vrf_id1)
self.nat44_add_address(nat_ip2, vrf_id=vrf_id2)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg2.sw_if_index, is_add=1
)
try:
# first VRF
pkts = self.create_stream_in(self.pg0, self.pg2)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip1)
# second VRF
pkts = self.create_stream_in(self.pg1, self.pg2)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip2)
finally:
self.pg0.unconfig_ip4()
self.pg1.unconfig_ip4()
self.pg0.set_table_ip4(0)
self.pg1.set_table_ip4(0)
self.pg0.config_ip4()
self.pg1.config_ip4()
self.pg0.resolve_arp()
self.pg1.resolve_arp()
self.vapi.ip_table_add_del_v2(is_add=0, table={"table_id": vrf_id1})
self.vapi.ip_table_add_del_v2(is_add=0, table={"table_id": vrf_id2})
def test_vrf_feature_independent(self):
"""NAT44EI tenant VRF independent address pool mode"""
nat_ip1 = "10.0.0.10"
nat_ip2 = "10.0.0.11"
self.nat44_add_address(nat_ip1)
self.nat44_add_address(nat_ip2, vrf_id=99)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg2.sw_if_index, is_add=1
)
# first VRF
pkts = self.create_stream_in(self.pg0, self.pg2)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip1)
# second VRF
pkts = self.create_stream_in(self.pg1, self.pg2)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip1)
def test_dynamic_ipless_interfaces(self):
"""NAT44EI interfaces without configured IP address"""
self.create_routes_and_neigbors()
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg7.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg8.sw_if_index, is_add=1
)
# in2out
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)
# out2in
pkts = self.create_stream_out(self.pg8, self.nat_addr)
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)
def test_static_ipless_interfaces(self):
"""NAT44EI interfaces without configured IP address - 1:1 NAT"""
self.create_routes_and_neigbors()
self.nat44_add_static_mapping(self.pg7.remote_ip4, self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg7.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg8.sw_if_index, is_add=1
)
# out2in
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)
# in2out
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, self.nat_addr, True)
def test_static_with_port_ipless_interfaces(self):
"""NAT44EI interfaces without configured IP address - 1:1 NAPT"""
self.tcp_port_out = 30606
self.udp_port_out = 30607
self.icmp_id_out = 30608
self.create_routes_and_neigbors()
self.nat44_add_address(self.nat_addr)
self.nat44_add_static_mapping(
self.pg7.remote_ip4,
self.nat_addr,
self.tcp_port_in,
self.tcp_port_out,
proto=IP_PROTOS.tcp,
)
self.nat44_add_static_mapping(
self.pg7.remote_ip4,
self.nat_addr,
self.udp_port_in,
self.udp_port_out,
proto=IP_PROTOS.udp,
)
self.nat44_add_static_mapping(
self.pg7.remote_ip4,
self.nat_addr,
self.icmp_id_in,
self.icmp_id_out,
proto=IP_PROTOS.icmp,
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg7.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg8.sw_if_index, is_add=1
)
# out2in
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)
# in2out
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)
def test_static_unknown_proto(self):
"""NAT44EI 1:1 translate packet with unknown protocol"""
nat_ip = "10.0.0.10"
self.nat44_add_static_mapping(self.pg0.remote_ip4, nat_ip)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# in2out
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.pg3.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, nat_ip)
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=nat_ip)
/ GRE()
/ IP(src=self.pg3.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_static_unknown_proto(self):
"""NAT44EI 1:1 translate packet with unknown protocol - hairpinning"""
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_nat_ip = "10.0.0.10"
server_nat_ip = "10.0.0.11"
self.nat44_add_static_mapping(host.ip4, host_nat_ip)
self.nat44_add_static_mapping(server.ip4, server_nat_ip)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# host to server
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.pg3.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, host_nat_ip)
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=host_nat_ip)
/ GRE()
/ IP(src=self.pg3.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(self):
"""NAT44EI output feature (in2out postrouting)"""
self.nat44_add_address(self.nat_addr)
self.vapi.nat44_ei_add_del_output_interface(
sw_if_index=self.pg3.sw_if_index, is_add=1
)
# in2out
pkts = self.create_stream_in(self.pg0, self.pg3)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture)
# out2in
pkts = self.create_stream_out(self.pg3)
self.pg3.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)
# from non-NAT interface to NAT inside interface
pkts = self.create_stream_in(self.pg2, self.pg0)
self.pg2.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_no_translation(capture, self.pg2, self.pg0)
def test_output_feature_vrf_aware(self):
"""NAT44EI output feature VRF aware (in2out postrouting)"""
nat_ip_vrf10 = "10.0.0.10"
nat_ip_vrf20 = "10.0.0.20"
r1 = VppIpRoute(
self,
self.pg3.remote_ip4,
32,
[VppRoutePath(self.pg3.remote_ip4, self.pg3.sw_if_index)],
table_id=10,
)
r2 = VppIpRoute(
self,
self.pg3.remote_ip4,
32,
[VppRoutePath(self.pg3.remote_ip4, self.pg3.sw_if_index)],
table_id=20,
)
r1.add_vpp_config()
r2.add_vpp_config()
self.nat44_add_address(nat_ip_vrf10, vrf_id=10)
self.nat44_add_address(nat_ip_vrf20, vrf_id=20)
self.vapi.nat44_ei_add_del_output_interface(
sw_if_index=self.pg3.sw_if_index, is_add=1
)
# in2out VRF 10
pkts = self.create_stream_in(self.pg4, self.pg3)
self.pg4.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip=nat_ip_vrf10)
# out2in VRF 10
pkts = self.create_stream_out(self.pg3, dst_ip=nat_ip_vrf10)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg4.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg4)
# in2out VRF 20
pkts = self.create_stream_in(self.pg6, self.pg3)
self.pg6.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg3.get_capture(len(pkts))
self.verify_capture_out(capture, nat_ip=nat_ip_vrf20)
# out2in VRF 20
pkts = self.create_stream_out(self.pg3, dst_ip=nat_ip_vrf20)
self.pg3.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg6.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg6)
def test_output_feature_hairpinning(self):
"""NAT44EI output feature hairpinning (in2out postrouting)"""
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_in_port = 1234
host_out_port = 0
server_in_port = 5678
server_out_port = 8765
self.nat44_add_address(self.nat_addr)
self.vapi.nat44_ei_add_del_output_interface(
sw_if_index=self.pg0.sw_if_index, is_add=1
)
self.vapi.nat44_ei_add_del_output_interface(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for server
self.nat44_add_static_mapping(
server.ip4,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.tcp,
)
# send packet from host to server
p = (
Ether(src=host.mac, dst=self.pg0.local_mac)
/ IP(src=host.ip4, dst=self.nat_addr)
/ TCP(sport=host_in_port, dport=server_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, server.ip4)
self.assertNotEqual(tcp.sport, host_in_port)
self.assertEqual(tcp.dport, server_in_port)
self.assert_packet_checksums_valid(p)
host_out_port = tcp.sport
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# send reply from server to host
p = (
Ether(src=server.mac, dst=self.pg0.local_mac)
/ IP(src=server.ip4, dst=self.nat_addr)
/ TCP(sport=server_in_port, dport=host_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, host.ip4)
self.assertEqual(tcp.sport, server_out_port)
self.assertEqual(tcp.dport, host_in_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_one_armed_nat44(self):
"""NAT44EI One armed NAT"""
remote_host = self.pg9.remote_hosts[0]
local_host = self.pg9.remote_hosts[1]
external_port = 0
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg9.sw_if_index, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg9.sw_if_index, flags=flags, is_add=1
)
# in2out
p = (
Ether(src=self.pg9.remote_mac, dst=self.pg9.local_mac)
/ IP(src=local_host.ip4, dst=remote_host.ip4)
/ TCP(sport=12345, dport=80)
)
self.pg9.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg9.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.assertNotEqual(tcp.sport, 12345)
external_port = tcp.sport
self.assertEqual(tcp.dport, 80)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
# out2in
p = (
Ether(src=self.pg9.remote_mac, dst=self.pg9.local_mac)
/ IP(src=remote_host.ip4, dst=self.nat_addr)
/ TCP(sport=80, dport=external_port)
)
self.pg9.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg9.get_capture(1)
p = capture[0]
try:
ip = p[IP]
tcp = p[TCP]
self.assertEqual(ip.src, remote_host.ip4)
self.assertEqual(ip.dst, local_host.ip4)
self.assertEqual(tcp.sport, 80)
self.assertEqual(tcp.dport, 12345)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
if self.vpp_worker_count > 1:
node = "nat44-ei-handoff-classify"
else:
node = "nat44-ei-classify"
err = self.statistics.get_err_counter("/err/%s/next in2out" % node)
self.assertEqual(err, 1)
err = self.statistics.get_err_counter("/err/%s/next out2in" % node)
self.assertEqual(err, 1)
def test_del_session(self):
"""NAT44EI delete session"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
pkts = self.create_stream_in(self.pg0, self.pg1)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg1.get_capture(len(pkts))
sessions = self.vapi.nat44_ei_user_session_dump(self.pg0.remote_ip4, 0)
nsessions = len(sessions)
self.vapi.nat44_ei_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=self.config_flags.NAT44_EI_IF_INSIDE,
)
self.vapi.nat44_ei_del_session(
address=sessions[1].outside_ip_address,
port=sessions[1].outside_port,
protocol=sessions[1].protocol,
)
sessions = self.vapi.nat44_ei_user_session_dump(self.pg0.remote_ip4, 0)
self.assertEqual(nsessions - len(sessions), 2)
self.vapi.nat44_ei_del_session(
address=sessions[0].inside_ip_address,
port=sessions[0].inside_port,
protocol=sessions[0].protocol,
flags=self.config_flags.NAT44_EI_IF_INSIDE,
)
self.verify_no_nat44_user()
def test_frag_in_order(self):
"""NAT44EI translate fragments arriving in order"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.frag_in_order(proto=IP_PROTOS.tcp)
self.frag_in_order(proto=IP_PROTOS.udp)
self.frag_in_order(proto=IP_PROTOS.icmp)
def test_frag_forwarding(self):
"""NAT44EI forwarding fragment test"""
self.vapi.nat44_ei_add_del_interface_addr(
is_add=1, sw_if_index=self.pg1.sw_if_index
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_forwarding_enable_disable(enable=1)
data = b"A" * 16 + b"B" * 16 + b"C" * 3
pkts = self.create_stream_frag(
self.pg1, self.pg0.remote_ip4, 4789, 4789, data, proto=IP_PROTOS.udp
)
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)
self.assertEqual(p[UDP].sport, 4789)
self.assertEqual(p[UDP].dport, 4789)
self.assertEqual(data, p[Raw].load)
def test_reass_hairpinning(self):
"""NAT44EI fragments hairpinning"""
server_addr = self.pg0.remote_hosts[1].ip4
host_in_port = random.randint(1025, 65535)
server_in_port = random.randint(1025, 65535)
server_out_port = random.randint(1025, 65535)
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for server
self.nat44_add_static_mapping(
server_addr,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.tcp,
)
self.nat44_add_static_mapping(
server_addr,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.udp,
)
self.nat44_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,
)
self.reass_hairpinning(
server_addr,
server_in_port,
server_out_port,
host_in_port,
proto=IP_PROTOS.udp,
)
self.reass_hairpinning(
server_addr,
server_in_port,
server_out_port,
host_in_port,
proto=IP_PROTOS.icmp,
)
def test_frag_out_of_order(self):
"""NAT44EI translate fragments arriving out of order"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.frag_out_of_order(proto=IP_PROTOS.tcp)
self.frag_out_of_order(proto=IP_PROTOS.udp)
self.frag_out_of_order(proto=IP_PROTOS.icmp)
def test_port_restricted(self):
"""NAT44EI Port restricted NAT44EI (MAP-E CE)"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_set_addr_and_port_alloc_alg(
alg=1, psid_offset=6, psid_length=6, psid=10
)
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=4567, dport=22)
)
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.dst, self.pg1.remote_ip4)
self.assertEqual(ip.src, self.nat_addr)
self.assertEqual(tcp.dport, 22)
self.assertNotEqual(tcp.sport, 4567)
self.assertEqual((tcp.sport >> 6) & 63, 10)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
def test_port_range(self):
"""NAT44EI External address port range"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_set_addr_and_port_alloc_alg(
alg=2, start_port=1025, end_port=1027
)
pkts = []
for port in range(0, 5):
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=1125 + port)
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(3)
for p in capture:
tcp = p[TCP]
self.assertGreaterEqual(tcp.sport, 1025)
self.assertLessEqual(tcp.sport, 1027)
def test_multiple_outside_vrf(self):
"""NAT44EI Multiple outside VRF"""
vrf_id1 = 1
vrf_id2 = 2
self.pg1.unconfig_ip4()
self.pg2.unconfig_ip4()
self.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": vrf_id1})
self.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": vrf_id2})
self.pg1.set_table_ip4(vrf_id1)
self.pg2.set_table_ip4(vrf_id2)
self.pg1.config_ip4()
self.pg2.config_ip4()
self.pg1.resolve_arp()
self.pg2.resolve_arp()
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg2.sw_if_index, is_add=1
)
try:
# first VRF
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, self.nat_addr)
pkts = self.create_stream_out(self.pg1, self.nat_addr)
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.tcp_port_in = 60303
self.udp_port_in = 60304
self.icmp_id_in = 60305
# second VRF
pkts = self.create_stream_in(self.pg0, self.pg2)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg2.get_capture(len(pkts))
self.verify_capture_out(capture, self.nat_addr)
pkts = self.create_stream_out(self.pg2, self.nat_addr)
self.pg2.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)
finally:
self.nat44_add_address(self.nat_addr, is_add=0)
self.pg1.unconfig_ip4()
self.pg2.unconfig_ip4()
self.pg1.set_table_ip4(0)
self.pg2.set_table_ip4(0)
self.pg1.config_ip4()
self.pg2.config_ip4()
self.pg1.resolve_arp()
self.pg2.resolve_arp()
def test_mss_clamping(self):
"""NAT44EI TCP MSS clamping"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
p = (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ TCP(
sport=self.tcp_port_in,
dport=self.tcp_external_port,
flags="S",
options=[("MSS", 1400)],
)
)
self.vapi.nat44_ei_set_mss_clamping(enable=1, mss_value=1000)
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
# Negotiated MSS value greater than configured - changed
self.verify_mss_value(capture[0], 1000)
self.vapi.nat44_ei_set_mss_clamping(enable=0, mss_value=1500)
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
# MSS clamping disabled - negotiated MSS unchanged
self.verify_mss_value(capture[0], 1400)
self.vapi.nat44_ei_set_mss_clamping(enable=1, mss_value=1500)
self.pg0.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
# Negotiated MSS value smaller than configured - unchanged
self.verify_mss_value(capture[0], 1400)
def test_ha_send(self):
"""NAT44EI Send HA session synchronization events (active)"""
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.nat44_add_address(self.nat_addr)
self.vapi.nat44_ei_ha_set_listener(
ip_address=self.pg3.local_ip4, port=12345, path_mtu=512
)
self.vapi.nat44_ei_ha_set_failover(
ip_address=self.pg3.remote_ip4, port=12346, session_refresh_interval=10
)
bind_layers(UDP, HANATStateSync, sport=12345)
# create sessions
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)
# active send HA events
self.vapi.nat44_ei_ha_flush()
stats = self.statistics["/nat44-ei/ha/add-event-send"]
self.assertEqual(stats[:, 0].sum(), 3)
capture = self.pg3.get_capture(1)
p = capture[0]
self.assert_packet_checksums_valid(p)
try:
ip = p[IP]
udp = p[UDP]
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(ip.src, self.pg3.local_ip4)
self.assertEqual(ip.dst, self.pg3.remote_ip4)
self.assertEqual(udp.sport, 12345)
self.assertEqual(udp.dport, 12346)
self.assertEqual(hanat.version, 1)
# self.assertEqual(hanat.thread_index, 0)
self.assertEqual(hanat.count, 3)
seq = hanat.sequence_number
for event in hanat.events:
self.assertEqual(event.event_type, 1)
self.assertEqual(event.in_addr, self.pg0.remote_ip4)
self.assertEqual(event.out_addr, self.nat_addr)
self.assertEqual(event.fib_index, 0)
# ACK received events
ack = (
Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac)
/ IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4)
/ UDP(sport=12346, dport=12345)
/ HANATStateSync(
sequence_number=seq, flags="ACK", thread_index=hanat.thread_index
)
)
self.pg3.add_stream(ack)
self.pg_start()
stats = self.statistics["/nat44-ei/ha/ack-recv"]
self.assertEqual(stats[:, 0].sum(), 1)
# delete one session
self.pg_enable_capture(self.pg_interfaces)
self.vapi.nat44_ei_del_session(
address=self.pg0.remote_ip4,
port=self.tcp_port_in,
protocol=IP_PROTOS.tcp,
flags=self.config_flags.NAT44_EI_IF_INSIDE,
)
self.vapi.nat44_ei_ha_flush()
stats = self.statistics["/nat44-ei/ha/del-event-send"]
self.assertEqual(stats[:, 0].sum(), 1)
capture = self.pg3.get_capture(1)
p = capture[0]
try:
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertGreater(hanat.sequence_number, seq)
# do not send ACK, active retry send HA event again
self.pg_enable_capture(self.pg_interfaces)
self.virtual_sleep(12)
stats = self.statistics["/nat44-ei/ha/retry-count"]
self.assertEqual(stats[:, 0].sum(), 3)
stats = self.statistics["/nat44-ei/ha/missed-count"]
self.assertEqual(stats[:, 0].sum(), 1)
capture = self.pg3.get_capture(3)
for packet in capture:
self.assertEqual(packet, p)
# session counters refresh
pkts = self.create_stream_out(self.pg1)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
self.pg0.get_capture(2)
self.vapi.nat44_ei_ha_flush()
stats = self.statistics["/nat44-ei/ha/refresh-event-send"]
self.assertEqual(stats[:, 0].sum(), 2)
capture = self.pg3.get_capture(1)
p = capture[0]
self.assert_packet_checksums_valid(p)
try:
ip = p[IP]
udp = p[UDP]
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(ip.src, self.pg3.local_ip4)
self.assertEqual(ip.dst, self.pg3.remote_ip4)
self.assertEqual(udp.sport, 12345)
self.assertEqual(udp.dport, 12346)
self.assertEqual(hanat.version, 1)
self.assertEqual(hanat.count, 2)
seq = hanat.sequence_number
for event in hanat.events:
self.assertEqual(event.event_type, 3)
self.assertEqual(event.out_addr, self.nat_addr)
self.assertEqual(event.fib_index, 0)
self.assertEqual(event.total_pkts, 2)
self.assertGreater(event.total_bytes, 0)
stats = self.statistics["/nat44-ei/ha/ack-recv"]
ack = (
Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac)
/ IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4)
/ UDP(sport=12346, dport=12345)
/ HANATStateSync(
sequence_number=seq, flags="ACK", thread_index=hanat.thread_index
)
)
self.pg3.add_stream(ack)
self.pg_start()
stats = self.statistics["/nat44-ei/ha/ack-recv"]
self.assertEqual(stats[:, 0].sum(), 2)
def test_ha_recv(self):
"""NAT44EI Receive HA session synchronization events (passive)"""
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_ha_set_listener(
ip_address=self.pg3.local_ip4, port=12345, path_mtu=512
)
bind_layers(UDP, HANATStateSync, sport=12345)
# this is a bit tricky - HA dictates thread index due to how it's
# designed, but once we use HA to create a session, we also want
# to pass a packet through said session. so the session must end
# up on the correct thread from both directions - in2out (based on
# IP address) and out2in (based on outside port)
# first choose a thread index which is correct for IP
thread_index = get_nat44_ei_in2out_worker_index(
self.pg0.remote_ip4, self.vpp_worker_count
)
# now pick a port which is correct for given thread
port_per_thread = int((0xFFFF - 1024) / max(1, self.vpp_worker_count))
self.tcp_port_out = 1024 + random.randint(1, port_per_thread)
self.udp_port_out = 1024 + random.randint(1, port_per_thread)
if self.vpp_worker_count > 0:
self.tcp_port_out += port_per_thread * (thread_index - 1)
self.udp_port_out += port_per_thread * (thread_index - 1)
# send HA session add events to failover/passive
p = (
Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac)
/ IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4)
/ UDP(sport=12346, dport=12345)
/ HANATStateSync(
sequence_number=1,
events=[
Event(
event_type="add",
protocol="tcp",
in_addr=self.pg0.remote_ip4,
out_addr=self.nat_addr,
in_port=self.tcp_port_in,
out_port=self.tcp_port_out,
eh_addr=self.pg1.remote_ip4,
ehn_addr=self.pg1.remote_ip4,
eh_port=self.tcp_external_port,
ehn_port=self.tcp_external_port,
fib_index=0,
),
Event(
event_type="add",
protocol="udp",
in_addr=self.pg0.remote_ip4,
out_addr=self.nat_addr,
in_port=self.udp_port_in,
out_port=self.udp_port_out,
eh_addr=self.pg1.remote_ip4,
ehn_addr=self.pg1.remote_ip4,
eh_port=self.udp_external_port,
ehn_port=self.udp_external_port,
fib_index=0,
),
],
thread_index=thread_index,
)
)
self.pg3.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# receive ACK
capture = self.pg3.get_capture(1)
p = capture[0]
try:
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(hanat.sequence_number, 1)
self.assertEqual(hanat.flags, "ACK")
self.assertEqual(hanat.version, 1)
self.assertEqual(hanat.thread_index, thread_index)
stats = self.statistics["/nat44-ei/ha/ack-send"]
self.assertEqual(stats[:, 0].sum(), 1)
stats = self.statistics["/nat44-ei/ha/add-event-recv"]
self.assertEqual(stats[:, 0].sum(), 2)
users = self.statistics["/nat44-ei/total-users"]
self.assertEqual(users[:, 0].sum(), 1)
sessions = self.statistics["/nat44-ei/total-sessions"]
self.assertEqual(sessions[:, 0].sum(), 2)
users = self.vapi.nat44_ei_user_dump()
self.assertEqual(len(users), 1)
self.assertEqual(str(users[0].ip_address), self.pg0.remote_ip4)
# there should be 2 sessions created by HA
sessions = self.vapi.nat44_ei_user_session_dump(
users[0].ip_address, users[0].vrf_id
)
self.assertEqual(len(sessions), 2)
for session in sessions:
self.assertEqual(str(session.inside_ip_address), self.pg0.remote_ip4)
self.assertEqual(str(session.outside_ip_address), self.nat_addr)
self.assertIn(session.inside_port, [self.tcp_port_in, self.udp_port_in])
self.assertIn(session.outside_port, [self.tcp_port_out, self.udp_port_out])
self.assertIn(session.protocol, [IP_PROTOS.tcp, IP_PROTOS.udp])
# send HA session delete event to failover/passive
p = (
Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac)
/ IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4)
/ UDP(sport=12346, dport=12345)
/ HANATStateSync(
sequence_number=2,
events=[
Event(
event_type="del",
protocol="udp",
in_addr=self.pg0.remote_ip4,
out_addr=self.nat_addr,
in_port=self.udp_port_in,
out_port=self.udp_port_out,
eh_addr=self.pg1.remote_ip4,
ehn_addr=self.pg1.remote_ip4,
eh_port=self.udp_external_port,
ehn_port=self.udp_external_port,
fib_index=0,
)
],
thread_index=thread_index,
)
)
self.pg3.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# receive ACK
capture = self.pg3.get_capture(1)
p = capture[0]
try:
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(hanat.sequence_number, 2)
self.assertEqual(hanat.flags, "ACK")
self.assertEqual(hanat.version, 1)
users = self.vapi.nat44_ei_user_dump()
self.assertEqual(len(users), 1)
self.assertEqual(str(users[0].ip_address), self.pg0.remote_ip4)
# now we should have only 1 session, 1 deleted by HA
sessions = self.vapi.nat44_ei_user_session_dump(
users[0].ip_address, users[0].vrf_id
)
self.assertEqual(len(sessions), 1)
stats = self.statistics["/nat44-ei/ha/del-event-recv"]
self.assertEqual(stats[:, 0].sum(), 1)
stats = self.statistics.get_err_counter("/err/nat44-ei-ha/pkts-processed")
self.assertEqual(stats, 2)
# send HA session refresh event to failover/passive
p = (
Ether(dst=self.pg3.local_mac, src=self.pg3.remote_mac)
/ IP(src=self.pg3.remote_ip4, dst=self.pg3.local_ip4)
/ UDP(sport=12346, dport=12345)
/ HANATStateSync(
sequence_number=3,
events=[
Event(
event_type="refresh",
protocol="tcp",
in_addr=self.pg0.remote_ip4,
out_addr=self.nat_addr,
in_port=self.tcp_port_in,
out_port=self.tcp_port_out,
eh_addr=self.pg1.remote_ip4,
ehn_addr=self.pg1.remote_ip4,
eh_port=self.tcp_external_port,
ehn_port=self.tcp_external_port,
fib_index=0,
total_bytes=1024,
total_pkts=2,
)
],
thread_index=thread_index,
)
)
self.pg3.add_stream(p)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
# receive ACK
capture = self.pg3.get_capture(1)
p = capture[0]
try:
hanat = p[HANATStateSync]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(hanat.sequence_number, 3)
self.assertEqual(hanat.flags, "ACK")
self.assertEqual(hanat.version, 1)
users = self.vapi.nat44_ei_user_dump()
self.assertEqual(len(users), 1)
self.assertEqual(str(users[0].ip_address), self.pg0.remote_ip4)
sessions = self.vapi.nat44_ei_user_session_dump(
users[0].ip_address, users[0].vrf_id
)
self.assertEqual(len(sessions), 1)
session = sessions[0]
self.assertEqual(session.total_bytes, 1024)
self.assertEqual(session.total_pkts, 2)
stats = self.statistics["/nat44-ei/ha/refresh-event-recv"]
self.assertEqual(stats[:, 0].sum(), 1)
stats = self.statistics.get_err_counter("/err/nat44-ei-ha/pkts-processed")
self.assertEqual(stats, 3)
# send packet to test session created by HA
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)
)
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]
except IndexError:
self.logger.error(ppp("Invalid packet:", p))
raise
else:
self.assertEqual(ip.src, self.pg1.remote_ip4)
self.assertEqual(ip.dst, self.pg0.remote_ip4)
self.assertEqual(tcp.sport, self.tcp_external_port)
self.assertEqual(tcp.dport, self.tcp_port_in)
def reconfigure_frame_queue_nelts(self, frame_queue_nelts):
self.vapi.nat44_ei_plugin_enable_disable(enable=0)
self.vapi.nat44_ei_set_fq_options(frame_queue_nelts=frame_queue_nelts)
# keep plugin configuration persistent
self.plugin_enable()
return self.vapi.nat44_ei_show_fq_options().frame_queue_nelts
def test_set_frame_queue_nelts(self):
"""NAT44EI API test - worker handoff frame queue elements"""
self.assertEqual(self.reconfigure_frame_queue_nelts(512), 512)
def show_commands_at_teardown(self):
self.logger.info(self.vapi.cli("show nat44 ei timeouts"))
self.logger.info(self.vapi.cli("show nat44 ei addresses"))
self.logger.info(self.vapi.cli("show nat44 ei interfaces"))
self.logger.info(self.vapi.cli("show nat44 ei static mappings"))
self.logger.info(self.vapi.cli("show nat44 ei interface address"))
self.logger.info(self.vapi.cli("show nat44 ei sessions detail"))
self.logger.info(self.vapi.cli("show nat44 ei hash tables detail"))
self.logger.info(self.vapi.cli("show nat44 ei ha"))
self.logger.info(self.vapi.cli("show nat44 ei addr-port-assignment-alg"))
def test_outside_address_distribution(self):
"""Outside address distribution based on source address"""
x = 100
nat_addresses = []
for i in range(1, x):
a = "10.0.0.%d" % i
nat_addresses.append(a)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
self.vapi.nat44_ei_add_del_address_range(
first_ip_address=nat_addresses[0],
last_ip_address=nat_addresses[-1],
vrf_id=0xFFFFFFFF,
is_add=1,
)
self.pg0.generate_remote_hosts(x)
pkts = []
for i in range(x):
info = self.create_packet_info(self.pg0, self.pg1)
payload = self.info_to_payload(info)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=self.pg0.remote_hosts[i].ip4, dst=self.pg1.remote_ip4)
/ UDP(sport=7000 + i, dport=8000 + i)
/ Raw(payload)
)
info.data = p
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
recvd = self.pg1.get_capture(len(pkts))
for p_recvd in recvd:
payload_info = self.payload_to_info(p_recvd[Raw])
packet_index = payload_info.index
info = self._packet_infos[packet_index]
self.assertTrue(info is not None)
self.assertEqual(packet_index, info.index)
p_sent = info.data
packed = socket.inet_aton(p_sent[IP].src)
numeric = struct.unpack("!L", packed)[0]
numeric = socket.htonl(numeric)
a = nat_addresses[(numeric - 1) % len(nat_addresses)]
self.assertEqual(
a,
p_recvd[IP].src,
"Invalid packet (src IP %s translated to %s, but expected %s)"
% (p_sent[IP].src, p_recvd[IP].src, a),
)
def test_default_user_sessions(self):
"""NAT44EI default per-user session limit is used and reported"""
nat44_ei_config = self.vapi.nat44_ei_show_running_config()
# a nonzero default should be reported for user_sessions
self.assertNotEqual(nat44_ei_config.user_sessions, 0)
def test_delete_interface(self):
"""NAT44EI delete nat interface"""
self.nat44_add_address(self.nat_addr)
interfaces = self.create_loopback_interfaces(4)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=interfaces[0].sw_if_index, is_add=1
)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=interfaces[1].sw_if_index, flags=flags, is_add=1
)
flags |= self.config_flags.NAT44_EI_IF_OUTSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=interfaces[2].sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_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_ei_interface_dump()
+ list(self.vapi.vpp.details_iter(self.vapi.nat44_ei_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_ei_interface_dump()
+ list(
self.vapi.vpp.details_iter(self.vapi.nat44_ei_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 TestNAT44Out2InDPO(MethodHolder):
"""NAT44EI Test Cases using out2in DPO"""
@classmethod
def setUpClass(cls):
super(TestNAT44Out2InDPO, cls).setUpClass()
cls.vapi.cli("set log class nat44-ei level debug")
cls.tcp_port_in = 6303
cls.tcp_port_out = 6303
cls.udp_port_in = 6304
cls.udp_port_out = 6304
cls.icmp_id_in = 6305
cls.icmp_id_out = 6305
cls.nat_addr = "10.0.0.3"
cls.dst_ip4 = "192.168.70.1"
cls.create_pg_interfaces(range(2))
cls.pg0.admin_up()
cls.pg0.config_ip4()
cls.pg0.resolve_arp()
cls.pg1.admin_up()
cls.pg1.config_ip6()
cls.pg1.resolve_ndp()
r1 = VppIpRoute(
cls,
"::",
0,
[VppRoutePath(cls.pg1.remote_ip6, cls.pg1.sw_if_index)],
register=False,
)
r1.add_vpp_config()
def setUp(self):
super(TestNAT44Out2InDPO, self).setUp()
flags = self.config_flags.NAT44_EI_OUT2IN_DPO
self.vapi.nat44_ei_plugin_enable_disable(enable=1, flags=flags)
def tearDown(self):
super(TestNAT44Out2InDPO, self).tearDown()
if not self.vpp_dead:
self.vapi.nat44_ei_plugin_enable_disable(enable=0)
self.vapi.cli("clear logging")
def configure_xlat(self):
self.dst_ip6_pfx = "1:2:3::"
self.dst_ip6_pfx_n = socket.inet_pton(socket.AF_INET6, self.dst_ip6_pfx)
self.dst_ip6_pfx_len = 96
self.src_ip6_pfx = "4:5:6::"
self.src_ip6_pfx_n = socket.inet_pton(socket.AF_INET6, self.src_ip6_pfx)
self.src_ip6_pfx_len = 96
self.vapi.map_add_domain(
self.dst_ip6_pfx_n,
self.dst_ip6_pfx_len,
self.src_ip6_pfx_n,
self.src_ip6_pfx_len,
"\x00\x00\x00\x00",
0,
)
@unittest.skip("Temporary disabled")
def test_464xlat_ce(self):
"""Test 464XLAT CE with NAT44EI"""
self.configure_xlat()
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_add_del_address_range(
first_ip_address=self.nat_addr_n,
last_ip_address=self.nat_addr_n,
vrf_id=0xFFFFFFFF,
is_add=1,
)
out_src_ip6 = self.compose_ip6(
self.dst_ip4, self.dst_ip6_pfx, self.dst_ip6_pfx_len
)
out_dst_ip6 = self.compose_ip6(
self.nat_addr, self.src_ip6_pfx, self.src_ip6_pfx_len
)
try:
pkts = self.create_stream_in(self.pg0, self.pg1, self.dst_ip4)
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_ip6(capture, nat_ip=out_dst_ip6, dst_ip=out_src_ip6)
pkts = self.create_stream_out_ip6(self.pg1, out_src_ip6, out_dst_ip6)
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)
finally:
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags
)
self.vapi.nat44_ei_add_del_address_range(
first_ip_address=self.nat_addr_n,
last_ip_address=self.nat_addr_n,
vrf_id=0xFFFFFFFF,
)
@unittest.skip("Temporary disabled")
def test_464xlat_ce_no_nat(self):
"""Test 464XLAT CE without NAT44EI"""
self.configure_xlat()
out_src_ip6 = self.compose_ip6(
self.dst_ip4, self.dst_ip6_pfx, self.dst_ip6_pfx_len
)
out_dst_ip6 = self.compose_ip6(
self.pg0.remote_ip4, self.src_ip6_pfx, self.src_ip6_pfx_len
)
pkts = self.create_stream_in(self.pg0, self.pg1, self.dst_ip4)
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_ip6(
capture, dst_ip=out_src_ip6, nat_ip=out_dst_ip6, same_port=True
)
pkts = self.create_stream_out_ip6(self.pg1, out_src_ip6, out_dst_ip6)
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)
@unittest.skipIf("nat" in config.excluded_plugins, "Exclude NAT plugin tests")
class TestNAT44EIMW(MethodHolder):
"""NAT44EI Test Cases (multiple workers)"""
vpp_worker_count = 2
max_translations = 10240
max_users = 10240
@classmethod
def setUpClass(cls):
super(TestNAT44EIMW, cls).setUpClass()
cls.vapi.cli("set log class nat level debug")
cls.tcp_port_in = 6303
cls.tcp_port_out = 6303
cls.udp_port_in = 6304
cls.udp_port_out = 6304
cls.icmp_id_in = 6305
cls.icmp_id_out = 6305
cls.nat_addr = "10.0.0.3"
cls.ipfix_src_port = 4739
cls.ipfix_domain_id = 1
cls.tcp_external_port = 80
cls.udp_external_port = 69
cls.create_pg_interfaces(range(10))
cls.interfaces = list(cls.pg_interfaces[0:4])
for i in cls.interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
cls.pg0.generate_remote_hosts(3)
cls.pg0.configure_ipv4_neighbors()
cls.pg1.generate_remote_hosts(1)
cls.pg1.configure_ipv4_neighbors()
cls.overlapping_interfaces = list(list(cls.pg_interfaces[4:7]))
cls.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": 10})
cls.vapi.ip_table_add_del_v2(is_add=1, table={"table_id": 20})
cls.pg4._local_ip4 = "172.16.255.1"
cls.pg4._remote_hosts[0]._ip4 = "172.16.255.2"
cls.pg4.set_table_ip4(10)
cls.pg5._local_ip4 = "172.17.255.3"
cls.pg5._remote_hosts[0]._ip4 = "172.17.255.4"
cls.pg5.set_table_ip4(10)
cls.pg6._local_ip4 = "172.16.255.1"
cls.pg6._remote_hosts[0]._ip4 = "172.16.255.2"
cls.pg6.set_table_ip4(20)
for i in cls.overlapping_interfaces:
i.config_ip4()
i.admin_up()
i.resolve_arp()
cls.pg7.admin_up()
cls.pg8.admin_up()
cls.pg9.generate_remote_hosts(2)
cls.pg9.config_ip4()
cls.vapi.sw_interface_add_del_address(
sw_if_index=cls.pg9.sw_if_index, prefix="10.0.0.1/24"
)
cls.pg9.admin_up()
cls.pg9.resolve_arp()
cls.pg9._remote_hosts[1]._ip4 = cls.pg9._remote_hosts[0]._ip4
cls.pg4._remote_ip4 = cls.pg9._remote_hosts[0]._ip4 = "10.0.0.2"
cls.pg9.resolve_arp()
def setUp(self):
super(TestNAT44EIMW, self).setUp()
self.vapi.nat44_ei_plugin_enable_disable(
sessions=self.max_translations, users=self.max_users, enable=1
)
def tearDown(self):
super(TestNAT44EIMW, self).tearDown()
if not self.vpp_dead:
self.vapi.nat44_ei_ipfix_enable_disable(
domain_id=self.ipfix_domain_id, src_port=self.ipfix_src_port, enable=0
)
self.ipfix_src_port = 4739
self.ipfix_domain_id = 1
self.vapi.nat44_ei_plugin_enable_disable(enable=0)
self.vapi.cli("clear logging")
def test_hairpinning(self):
"""NAT44EI hairpinning - 1:1 NAPT"""
host = self.pg0.remote_hosts[0]
server = self.pg0.remote_hosts[1]
host_in_port = 1234
host_out_port = 0
server_in_port = 5678
server_out_port = 8765
worker_1 = 1
worker_2 = 2
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for server
self.nat44_add_static_mapping(
server.ip4,
self.nat_addr,
server_in_port,
server_out_port,
proto=IP_PROTOS.tcp,
)
cnt = self.statistics["/nat44-ei/hairpinning"]
# send packet from host to server
p = (
Ether(src=host.mac, dst=self.pg0.local_mac)
/ IP(src=host.ip4, dst=self.nat_addr)
/ TCP(sport=host_in_port, dport=server_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, server.ip4)
self.assertNotEqual(tcp.sport, host_in_port)
self.assertEqual(tcp.dport, server_in_port)
self.assert_packet_checksums_valid(p)
host_out_port = tcp.sport
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(after[worker_2][if_idx] - cnt[worker_1][if_idx], 1)
# send reply from server to host
p = (
Ether(src=server.mac, dst=self.pg0.local_mac)
/ IP(src=server.ip4, dst=self.nat_addr)
/ TCP(sport=server_in_port, dport=host_out_port)
)
self.pg0.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.nat_addr)
self.assertEqual(ip.dst, host.ip4)
self.assertEqual(tcp.sport, server_out_port)
self.assertEqual(tcp.dport, host_in_port)
self.assert_packet_checksums_valid(p)
except:
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
after = self.statistics["/nat44-ei/hairpinning"]
if_idx = self.pg0.sw_if_index
self.assertEqual(after[worker_1][if_idx] - cnt[worker_1][if_idx], 1)
self.assertEqual(after[worker_2][if_idx] - cnt[worker_2][if_idx], 2)
def test_hairpinning2(self):
"""NAT44EI hairpinning - 1:1 NAT"""
server1_nat_ip = "10.0.0.10"
server2_nat_ip = "10.0.0.11"
host = self.pg0.remote_hosts[0]
server1 = self.pg0.remote_hosts[1]
server2 = self.pg0.remote_hosts[2]
server_tcp_port = 22
server_udp_port = 20
self.nat44_add_address(self.nat_addr)
flags = self.config_flags.NAT44_EI_IF_INSIDE
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1
)
self.vapi.nat44_ei_interface_add_del_feature(
sw_if_index=self.pg1.sw_if_index, is_add=1
)
# add static mapping for servers
self.nat44_add_static_mapping(server1.ip4, server1_nat_ip)
self.nat44_add_static_mapping(server2.ip4, server2_nat_ip)
# host to server1
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ TCP(sport=self.tcp_port_in, dport=server_tcp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ UDP(sport=self.udp_port_in, dport=server_udp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=host.ip4, dst=server1_nat_ip)
/ ICMP(id=self.icmp_id_in, type="echo-request")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, self.nat_addr)
self.assertEqual(packet[IP].dst, server1.ip4)
if packet.haslayer(TCP):
self.assertNotEqual(packet[TCP].sport, self.tcp_port_in)
self.assertEqual(packet[TCP].dport, server_tcp_port)
self.tcp_port_out = packet[TCP].sport
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertNotEqual(packet[UDP].sport, self.udp_port_in)
self.assertEqual(packet[UDP].dport, server_udp_port)
self.udp_port_out = packet[UDP].sport
else:
self.assertNotEqual(packet[ICMP].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP].id
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server1 to host
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ TCP(sport=server_tcp_port, dport=self.tcp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ UDP(sport=server_udp_port, dport=self.udp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=self.nat_addr)
/ ICMP(id=self.icmp_id_out, type="echo-reply")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server1_nat_ip)
self.assertEqual(packet[IP].dst, host.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].dport, self.tcp_port_in)
self.assertEqual(packet[TCP].sport, server_tcp_port)
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].dport, self.udp_port_in)
self.assertEqual(packet[UDP].sport, server_udp_port)
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server2 to server1
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ TCP(sport=self.tcp_port_in, dport=server_tcp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ UDP(sport=self.udp_port_in, dport=server_udp_port)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server2.ip4, dst=server1_nat_ip)
/ ICMP(id=self.icmp_id_in, type="echo-request")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server2_nat_ip)
self.assertEqual(packet[IP].dst, server1.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].sport, self.tcp_port_in)
self.assertEqual(packet[TCP].dport, server_tcp_port)
self.tcp_port_out = packet[TCP].sport
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].sport, self.udp_port_in)
self.assertEqual(packet[UDP].dport, server_udp_port)
self.udp_port_out = packet[UDP].sport
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
self.icmp_id_out = packet[ICMP].id
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# server1 to server2
pkts = []
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ TCP(sport=server_tcp_port, dport=self.tcp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ UDP(sport=server_udp_port, dport=self.udp_port_out)
)
pkts.append(p)
p = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=server1.ip4, dst=server2_nat_ip)
/ ICMP(id=self.icmp_id_out, type="echo-reply")
)
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IP].src, server1_nat_ip)
self.assertEqual(packet[IP].dst, server2.ip4)
if packet.haslayer(TCP):
self.assertEqual(packet[TCP].dport, self.tcp_port_in)
self.assertEqual(packet[TCP].sport, server_tcp_port)
self.assert_packet_checksums_valid(packet)
elif packet.haslayer(UDP):
self.assertEqual(packet[UDP].dport, self.udp_port_in)
self.assertEqual(packet[UDP].sport, server_udp_port)
else:
self.assertEqual(packet[ICMP].id, self.icmp_id_in)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
Reference in New Issue View Git Blame Copy Permalink