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#!/usr/bin/env python3
import ipaddress
import random
import socket
import struct
import unittest
from io import BytesIO
from time import sleep
import scapy.compat
from framework import VppTestCase, VppTestRunner, running_extended_tests
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 ICMPv6DestUnreach, IPerror6, IPv6ExtHdrFragment
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6EchoReply, \
ICMPv6ND_NS, ICMPv6ND_NA, ICMPv6NDOptDstLLAddr, fragment6
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 ip4_range
from util import ppc, ppp
from vpp_acl import AclRule, VppAcl, VppAclInterface
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_neighbor import VppNeighbor
from vpp_papi import VppEnum
class MethodHolder(VppTestCase):
""" NAT create capture and verify method holder """
@property
def config_flags(self):
return VppEnum.vl_api_nat_config_flags_t
class TestNAT66(MethodHolder):
""" NAT66 Test Cases """
@classmethod
def setUpClass(cls):
super(TestNAT66, cls).setUpClass()
cls.nat_addr = 'fd01:ff::2'
cls.create_pg_interfaces(range(2))
cls.interfaces = list(cls.pg_interfaces)
for i in cls.interfaces:
i.admin_up()
i.config_ip6()
i.configure_ipv6_neighbors()
@classmethod
def tearDownClass(cls):
super(TestNAT66, cls).tearDownClass()
def test_static(self):
""" 1:1 NAT66 test """
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat66_add_del_interface(is_add=1, flags=flags,
sw_if_index=self.pg0.sw_if_index)
self.vapi.nat66_add_del_interface(is_add=1,
sw_if_index=self.pg1.sw_if_index)
self.vapi.nat66_add_del_static_mapping(
local_ip_address=self.pg0.remote_ip6,
external_ip_address=self.nat_addr,
is_add=1)
# in2out
pkts = []
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6) /
TCP())
pkts.append(p)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6) /
UDP())
pkts.append(p)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6) /
ICMPv6EchoRequest())
pkts.append(p)
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6) /
GRE() / IP() / TCP())
pkts.append(p)
self.pg0.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IPv6].src, self.nat_addr)
self.assertEqual(packet[IPv6].dst, self.pg1.remote_ip6)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# out2in
pkts = []
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IPv6(src=self.pg1.remote_ip6, dst=self.nat_addr) /
TCP())
pkts.append(p)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IPv6(src=self.pg1.remote_ip6, dst=self.nat_addr) /
UDP())
pkts.append(p)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IPv6(src=self.pg1.remote_ip6, dst=self.nat_addr) /
ICMPv6EchoReply())
pkts.append(p)
p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
IPv6(src=self.pg1.remote_ip6, dst=self.nat_addr) /
GRE() / IP() / TCP())
pkts.append(p)
self.pg1.add_stream(pkts)
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
for packet in capture:
try:
self.assertEqual(packet[IPv6].src, self.pg1.remote_ip6)
self.assertEqual(packet[IPv6].dst, self.pg0.remote_ip6)
self.assert_packet_checksums_valid(packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
sm = self.vapi.nat66_static_mapping_dump()
self.assertEqual(len(sm), 1)
self.assertEqual(sm[0].total_pkts, 8)
def test_check_no_translate(self):
""" NAT66 translate only when egress interface is outside interface """
flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat66_add_del_interface(is_add=1, flags=flags,
sw_if_index=self.pg0.sw_if_index)
self.vapi.nat66_add_del_interface(is_add=1, flags=flags,
sw_if_index=self.pg1.sw_if_index)
self.vapi.nat66_add_del_static_mapping(
local_ip_address=self.pg0.remote_ip6,
external_ip_address=self.nat_addr,
is_add=1)
# in2out
p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6) /
UDP())
self.pg0.add_stream([p])
self.pg_enable_capture(self.pg_interfaces)
self.pg_start()
capture = self.pg1.get_capture(1)
packet = capture[0]
try:
self.assertEqual(packet[IPv6].src, self.pg0.remote_ip6)
self.assertEqual(packet[IPv6].dst, self.pg1.remote_ip6)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
def clear_nat66(self):
"""
Clear NAT66 configuration.
"""
interfaces = self.vapi.nat66_interface_dump()
for intf in interfaces:
self.vapi.nat66_add_del_interface(is_add=0, flags=intf.flags,
sw_if_index=intf.sw_if_index)
static_mappings = self.vapi.nat66_static_mapping_dump()
for sm in static_mappings:
self.vapi.nat66_add_del_static_mapping(
local_ip_address=sm.local_ip_address,
external_ip_address=sm.external_ip_address, vrf_id=sm.vrf_id,
is_add=0)
def tearDown(self):
super(TestNAT66, self).tearDown()
self.clear_nat66()
def show_commands_at_teardown(self):
self.logger.info(self.vapi.cli("show nat66 interfaces"))
self.logger.info(self.vapi.cli("show nat66 static mappings"))
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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