src/plugins/nat/test/test_nat44_ed.py

   1 #!/usr/bin/env python3
   2
   3 import unittest
   4 from io import BytesIO
   5 from random import randint
   6
   7 import scapy.compat
   8 from framework import VppTestCase, VppTestRunner
   9 from scapy.data import IP_PROTOS
  10 from scapy.layers.inet import IP, TCP, UDP, ICMP, GRE
  11 from scapy.layers.inet import IPerror, TCPerror
  12 from scapy.layers.l2 import Ether
  13 from scapy.packet import Raw
  14 from syslog_rfc5424_parser import SyslogMessage, ParseError
  15 from syslog_rfc5424_parser.constants import SyslogSeverity
  16 from util import ppp, ip4_range
  17 from vpp_acl import AclRule, VppAcl, VppAclInterface
  18 from vpp_ip_route import VppIpRoute, VppRoutePath
  19 from vpp_papi import VppEnum
  20
  21
  22 class NAT44EDTestCase(VppTestCase):
  23
  24     nat_addr = '10.0.0.3'
  25
  26     tcp_port_in = 6303
  27     tcp_port_out = 6303
  28
  29     udp_port_in = 6304
  30     udp_port_out = 6304
  31
  32     icmp_id_in = 6305
  33     icmp_id_out = 6305
  34
  35     tcp_external_port = 80
  36
  37     max_sessions = 100
  38
  39     def setUp(self):
  40         super(NAT44EDTestCase, self).setUp()
  41         self.plugin_enable()
  42
  43     def tearDown(self):
  44         super(NAT44EDTestCase, self).tearDown()
  45         if not self.vpp_dead:
  46             self.plugin_disable()
  47
  48     def plugin_enable(self):
  49         self.vapi.nat44_ed_plugin_enable_disable(
  50             sessions=self.max_sessions, enable=1)
  51
  52     def plugin_disable(self):
  53         self.vapi.nat44_ed_plugin_enable_disable(enable=0)
  54
  55     @property
  56     def config_flags(self):
  57         return VppEnum.vl_api_nat_config_flags_t
  58
  59     @property
  60     def nat44_config_flags(self):
  61         return VppEnum.vl_api_nat44_config_flags_t
  62
  63     @property
  64     def syslog_severity(self):
  65         return VppEnum.vl_api_syslog_severity_t
  66
  67     @property
  68     def server_addr(self):
  69         return self.pg1.remote_hosts[0].ip4
  70
  71     @staticmethod
  72     def random_port():
  73         return randint(1025, 65535)
  74
  75     @staticmethod
  76     def proto2layer(proto):
  77         if proto == IP_PROTOS.tcp:
  78             return TCP
  79         elif proto == IP_PROTOS.udp:
  80             return UDP
  81         elif proto == IP_PROTOS.icmp:
  82             return ICMP
  83         else:
  84             raise Exception("Unsupported protocol")
  85
  86     @classmethod
  87     def create_and_add_ip4_table(cls, i, table_id=0):
  88         cls.vapi.ip_table_add_del(is_add=1, table={'table_id': table_id})
  89         i.set_table_ip4(table_id)
  90
  91     @classmethod
  92     def configure_ip4_interface(cls, i, hosts=0, table_id=None):
  93         if table_id:
  94             cls.create_and_add_ip4_table(i, table_id)
  95
  96         i.admin_up()
  97         i.config_ip4()
  98         i.resolve_arp()
  99
 100         if hosts:
 101             i.generate_remote_hosts(hosts)
 102             i.configure_ipv4_neighbors()
 103
 104     @classmethod
 105     def nat_add_interface_address(cls, i):
 106         cls.vapi.nat44_add_del_interface_addr(
 107             sw_if_index=i.sw_if_index, is_add=1)
 108
 109     def nat_add_inside_interface(self, i):
 110         self.vapi.nat44_interface_add_del_feature(
 111             flags=self.config_flags.NAT_IS_INSIDE,
 112             sw_if_index=i.sw_if_index, is_add=1)
 113
 114     def nat_add_outside_interface(self, i):
 115         self.vapi.nat44_interface_add_del_feature(
 116             flags=self.config_flags.NAT_IS_OUTSIDE,
 117             sw_if_index=i.sw_if_index, is_add=1)
 118
 119     def nat_add_address(self, address, twice_nat=0,
 120                         vrf_id=0xFFFFFFFF, is_add=1):
 121         flags = self.config_flags.NAT_IS_TWICE_NAT if twice_nat else 0
 122         self.vapi.nat44_add_del_address_range(first_ip_address=address,
 123                                               last_ip_address=address,
 124                                               vrf_id=vrf_id,
 125                                               is_add=is_add,
 126                                               flags=flags)
 127
 128     def nat_add_static_mapping(self, local_ip, external_ip='0.0.0.0',
 129                                local_port=0, external_port=0, vrf_id=0,
 130                                is_add=1, external_sw_if_index=0xFFFFFFFF,
 131                                proto=0, tag="", flags=0):
 132
 133         if not (local_port and external_port):
 134             flags |= self.config_flags.NAT_IS_ADDR_ONLY
 135
 136         self.vapi.nat44_add_del_static_mapping(
 137             is_add=is_add,
 138             local_ip_address=local_ip,
 139             external_ip_address=external_ip,
 140             external_sw_if_index=external_sw_if_index,
 141             local_port=local_port,
 142             external_port=external_port,
 143             vrf_id=vrf_id, protocol=proto,
 144             flags=flags,
 145             tag=tag)
 146
 147     @classmethod
 148     def setUpClass(cls):
 149         super(NAT44EDTestCase, cls).setUpClass()
 150
 151         cls.create_pg_interfaces(range(12))
 152         cls.interfaces = list(cls.pg_interfaces[:4])
 153
 154         cls.create_and_add_ip4_table(cls.pg2, 10)
 155
 156         for i in cls.interfaces:
 157             cls.configure_ip4_interface(i, hosts=3)
 158
 159         # test specific (test-multiple-vrf)
 160         cls.vapi.ip_table_add_del(is_add=1, table={'table_id': 1})
 161
 162         # test specific (test-one-armed-nat44-static)
 163         cls.pg4.generate_remote_hosts(2)
 164         cls.pg4.config_ip4()
 165         cls.vapi.sw_interface_add_del_address(
 166             sw_if_index=cls.pg4.sw_if_index,
 167             prefix="10.0.0.1/24")
 168         cls.pg4.admin_up()
 169         cls.pg4.resolve_arp()
 170         cls.pg4._remote_hosts[1]._ip4 = cls.pg4._remote_hosts[0]._ip4
 171         cls.pg4.resolve_arp()
 172
 173         # test specific interface (pg5)
 174         cls.pg5._local_ip4 = "10.1.1.1"
 175         cls.pg5._remote_hosts[0]._ip4 = "10.1.1.2"
 176         cls.pg5.set_table_ip4(1)
 177         cls.pg5.config_ip4()
 178         cls.pg5.admin_up()
 179         cls.pg5.resolve_arp()
 180
 181         # test specific interface (pg6)
 182         cls.pg6._local_ip4 = "10.1.2.1"
 183         cls.pg6._remote_hosts[0]._ip4 = "10.1.2.2"
 184         cls.pg6.set_table_ip4(1)
 185         cls.pg6.config_ip4()
 186         cls.pg6.admin_up()
 187         cls.pg6.resolve_arp()
 188
 189         rl = list()
 190
 191         rl.append(VppIpRoute(cls, "0.0.0.0", 0,
 192                              [VppRoutePath("0.0.0.0", 0xffffffff,
 193                                            nh_table_id=0)],
 194                              register=False, table_id=1))
 195         rl.append(VppIpRoute(cls, "0.0.0.0", 0,
 196                              [VppRoutePath(cls.pg1.local_ip4,
 197                                            cls.pg1.sw_if_index)],
 198                              register=False))
 199         rl.append(VppIpRoute(cls, cls.pg5.remote_ip4, 32,
 200                              [VppRoutePath("0.0.0.0",
 201                                            cls.pg5.sw_if_index)],
 202                              register=False, table_id=1))
 203         rl.append(VppIpRoute(cls, cls.pg6.remote_ip4, 32,
 204                              [VppRoutePath("0.0.0.0",
 205                                            cls.pg6.sw_if_index)],
 206                              register=False, table_id=1))
 207         rl.append(VppIpRoute(cls, cls.pg6.remote_ip4, 16,
 208                              [VppRoutePath("0.0.0.0", 0xffffffff,
 209                                            nh_table_id=1)],
 210                              register=False, table_id=0))
 211
 212         for r in rl:
 213             r.add_vpp_config()
 214
 215     def get_err_counter(self, path):
 216         return self.statistics.get_err_counter(path)
 217
 218     def reass_hairpinning(self, server_addr, server_in_port, server_out_port,
 219                           host_in_port, proto=IP_PROTOS.tcp,
 220                           ignore_port=False):
 221         layer = self.proto2layer(proto)
 222
 223         if proto == IP_PROTOS.tcp:
 224             data = b"A" * 4 + b"B" * 16 + b"C" * 3
 225         else:
 226             data = b"A" * 16 + b"B" * 16 + b"C" * 3
 227
 228         # send packet from host to server
 229         pkts = self.create_stream_frag(self.pg0,
 230                                        self.nat_addr,
 231                                        host_in_port,
 232                                        server_out_port,
 233                                        data,
 234                                        proto)
 235         self.pg0.add_stream(pkts)
 236         self.pg_enable_capture(self.pg_interfaces)
 237         self.pg_start()
 238         frags = self.pg0.get_capture(len(pkts))
 239         p = self.reass_frags_and_verify(frags,
 240                                         self.nat_addr,
 241                                         server_addr)
 242         if proto != IP_PROTOS.icmp:
 243             if not ignore_port:
 244                 self.assertNotEqual(p[layer].sport, host_in_port)
 245             self.assertEqual(p[layer].dport, server_in_port)
 246         else:
 247             if not ignore_port:
 248                 self.assertNotEqual(p[layer].id, host_in_port)
 249         self.assertEqual(data, p[Raw].load)
 250
 251     def frag_out_of_order(self, proto=IP_PROTOS.tcp, dont_translate=False,
 252                           ignore_port=False):
 253         layer = self.proto2layer(proto)
 254
 255         if proto == IP_PROTOS.tcp:
 256             data = b"A" * 4 + b"B" * 16 + b"C" * 3
 257         else:
 258             data = b"A" * 16 + b"B" * 16 + b"C" * 3
 259         self.port_in = self.random_port()
 260
 261         for i in range(2):
 262             # in2out
 263             pkts = self.create_stream_frag(self.pg0, self.pg1.remote_ip4,
 264                                            self.port_in, 20, data, proto)
 265             pkts.reverse()
 266             self.pg0.add_stream(pkts)
 267             self.pg_enable_capture(self.pg_interfaces)
 268             self.pg_start()
 269             frags = self.pg1.get_capture(len(pkts))
 270             if not dont_translate:
 271                 p = self.reass_frags_and_verify(frags,
 272                                                 self.nat_addr,
 273                                                 self.pg1.remote_ip4)
 274             else:
 275                 p = self.reass_frags_and_verify(frags,
 276                                                 self.pg0.remote_ip4,
 277                                                 self.pg1.remote_ip4)
 278             if proto != IP_PROTOS.icmp:
 279                 if not dont_translate:
 280                     self.assertEqual(p[layer].dport, 20)
 281                     if not ignore_port:
 282                         self.assertNotEqual(p[layer].sport, self.port_in)
 283                 else:
 284                     self.assertEqual(p[layer].sport, self.port_in)
 285             else:
 286                 if not ignore_port:
 287                     if not dont_translate:
 288                         self.assertNotEqual(p[layer].id, self.port_in)
 289                     else:
 290                         self.assertEqual(p[layer].id, self.port_in)
 291             self.assertEqual(data, p[Raw].load)
 292
 293             # out2in
 294             if not dont_translate:
 295                 dst_addr = self.nat_addr
 296             else:
 297                 dst_addr = self.pg0.remote_ip4
 298             if proto != IP_PROTOS.icmp:
 299                 sport = 20
 300                 dport = p[layer].sport
 301             else:
 302                 sport = p[layer].id
 303                 dport = 0
 304             pkts = self.create_stream_frag(self.pg1, dst_addr, sport, dport,
 305                                            data, proto, echo_reply=True)
 306             pkts.reverse()
 307             self.pg1.add_stream(pkts)
 308             self.pg_enable_capture(self.pg_interfaces)
 309             self.logger.info(self.vapi.cli("show trace"))
 310             self.pg_start()
 311             frags = self.pg0.get_capture(len(pkts))
 312             p = self.reass_frags_and_verify(frags,
 313                                             self.pg1.remote_ip4,
 314                                             self.pg0.remote_ip4)
 315             if proto != IP_PROTOS.icmp:
 316                 self.assertEqual(p[layer].sport, 20)
 317                 self.assertEqual(p[layer].dport, self.port_in)
 318             else:
 319                 self.assertEqual(p[layer].id, self.port_in)
 320             self.assertEqual(data, p[Raw].load)
 321
 322     def reass_frags_and_verify(self, frags, src, dst):
 323         buffer = BytesIO()
 324         for p in frags:
 325             self.assertEqual(p[IP].src, src)
 326             self.assertEqual(p[IP].dst, dst)
 327             self.assert_ip_checksum_valid(p)
 328             buffer.seek(p[IP].frag * 8)
 329             buffer.write(bytes(p[IP].payload))
 330         ip = IP(src=frags[0][IP].src, dst=frags[0][IP].dst,
 331                 proto=frags[0][IP].proto)
 332         if ip.proto == IP_PROTOS.tcp:
 333             p = (ip / TCP(buffer.getvalue()))
 334             self.logger.debug(ppp("Reassembled:", p))
 335             self.assert_tcp_checksum_valid(p)
 336         elif ip.proto == IP_PROTOS.udp:
 337             p = (ip / UDP(buffer.getvalue()[:8]) /
 338                  Raw(buffer.getvalue()[8:]))
 339         elif ip.proto == IP_PROTOS.icmp:
 340             p = (ip / ICMP(buffer.getvalue()))
 341         return p
 342
 343     def frag_in_order(self, proto=IP_PROTOS.tcp, dont_translate=False,
 344                       ignore_port=False):
 345         layer = self.proto2layer(proto)
 346
 347         if proto == IP_PROTOS.tcp:
 348             data = b"A" * 4 + b"B" * 16 + b"C" * 3
 349         else:
 350             data = b"A" * 16 + b"B" * 16 + b"C" * 3
 351         self.port_in = self.random_port()
 352
 353         # in2out
 354         pkts = self.create_stream_frag(self.pg0, self.pg1.remote_ip4,
 355                                        self.port_in, 20, data, proto)
 356         self.pg0.add_stream(pkts)
 357         self.pg_enable_capture(self.pg_interfaces)
 358         self.pg_start()
 359         frags = self.pg1.get_capture(len(pkts))
 360         if not dont_translate:
 361             p = self.reass_frags_and_verify(frags,
 362                                             self.nat_addr,
 363                                             self.pg1.remote_ip4)
 364         else:
 365             p = self.reass_frags_and_verify(frags,
 366                                             self.pg0.remote_ip4,
 367                                             self.pg1.remote_ip4)
 368         if proto != IP_PROTOS.icmp:
 369             if not dont_translate:
 370                 self.assertEqual(p[layer].dport, 20)
 371                 if not ignore_port:
 372                     self.assertNotEqual(p[layer].sport, self.port_in)
 373             else:
 374                 self.assertEqual(p[layer].sport, self.port_in)
 375         else:
 376             if not ignore_port:
 377                 if not dont_translate:
 378                     self.assertNotEqual(p[layer].id, self.port_in)
 379                 else:
 380                     self.assertEqual(p[layer].id, self.port_in)
 381         self.assertEqual(data, p[Raw].load)
 382
 383         # out2in
 384         if not dont_translate:
 385             dst_addr = self.nat_addr
 386         else:
 387             dst_addr = self.pg0.remote_ip4
 388         if proto != IP_PROTOS.icmp:
 389             sport = 20
 390             dport = p[layer].sport
 391         else:
 392             sport = p[layer].id
 393             dport = 0
 394         pkts = self.create_stream_frag(self.pg1, dst_addr, sport, dport, data,
 395                                        proto, echo_reply=True)
 396         self.pg1.add_stream(pkts)
 397         self.pg_enable_capture(self.pg_interfaces)
 398         self.pg_start()
 399         frags = self.pg0.get_capture(len(pkts))
 400         p = self.reass_frags_and_verify(frags,
 401                                         self.pg1.remote_ip4,
 402                                         self.pg0.remote_ip4)
 403         if proto != IP_PROTOS.icmp:
 404             self.assertEqual(p[layer].sport, 20)
 405             self.assertEqual(p[layer].dport, self.port_in)
 406         else:
 407             self.assertEqual(p[layer].id, self.port_in)
 408         self.assertEqual(data, p[Raw].load)
 409
 410     def verify_capture_out(self, capture, nat_ip=None, same_port=False,
 411                            dst_ip=None, ignore_port=False):
 412         if nat_ip is None:
 413             nat_ip = self.nat_addr
 414         for packet in capture:
 415             try:
 416                 self.assert_packet_checksums_valid(packet)
 417                 self.assertEqual(packet[IP].src, nat_ip)
 418                 if dst_ip is not None:
 419                     self.assertEqual(packet[IP].dst, dst_ip)
 420                 if packet.haslayer(TCP):
 421                     if not ignore_port:
 422                         if same_port:
 423                             self.assertEqual(
 424                                 packet[TCP].sport, self.tcp_port_in)
 425                         else:
 426                             self.assertNotEqual(
 427                                 packet[TCP].sport, self.tcp_port_in)
 428                     self.tcp_port_out = packet[TCP].sport
 429                     self.assert_packet_checksums_valid(packet)
 430                 elif packet.haslayer(UDP):
 431                     if not ignore_port:
 432                         if same_port:
 433                             self.assertEqual(
 434                                 packet[UDP].sport, self.udp_port_in)
 435                         else:
 436                             self.assertNotEqual(
 437                                 packet[UDP].sport, self.udp_port_in)
 438                     self.udp_port_out = packet[UDP].sport
 439                 else:
 440                     if not ignore_port:
 441                         if same_port:
 442                             self.assertEqual(
 443                                 packet[ICMP].id, self.icmp_id_in)
 444                         else:
 445                             self.assertNotEqual(
 446                                 packet[ICMP].id, self.icmp_id_in)
 447                     self.icmp_id_out = packet[ICMP].id
 448                     self.assert_packet_checksums_valid(packet)
 449             except:
 450                 self.logger.error(ppp("Unexpected or invalid packet "
 451                                       "(outside network):", packet))
 452                 raise
 453
 454     def verify_capture_in(self, capture, in_if):
 455         for packet in capture:
 456             try:
 457                 self.assert_packet_checksums_valid(packet)
 458                 self.assertEqual(packet[IP].dst, in_if.remote_ip4)
 459                 if packet.haslayer(TCP):
 460                     self.assertEqual(packet[TCP].dport, self.tcp_port_in)
 461                 elif packet.haslayer(UDP):
 462                     self.assertEqual(packet[UDP].dport, self.udp_port_in)
 463                 else:
 464                     self.assertEqual(packet[ICMP].id, self.icmp_id_in)
 465             except:
 466                 self.logger.error(ppp("Unexpected or invalid packet "
 467                                       "(inside network):", packet))
 468                 raise
 469
 470     def create_stream_in(self, in_if, out_if, dst_ip=None, ttl=64):
 471         if dst_ip is None:
 472             dst_ip = out_if.remote_ip4
 473
 474         pkts = []
 475         # TCP
 476         p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
 477              IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 478              TCP(sport=self.tcp_port_in, dport=20))
 479         pkts.extend([p, p])
 480
 481         # UDP
 482         p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
 483              IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 484              UDP(sport=self.udp_port_in, dport=20))
 485         pkts.append(p)
 486
 487         # ICMP
 488         p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
 489              IP(src=in_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 490              ICMP(id=self.icmp_id_in, type='echo-request'))
 491         pkts.append(p)
 492
 493         return pkts
 494
 495     def create_stream_out(self, out_if, dst_ip=None, ttl=64,
 496                           use_inside_ports=False):
 497         if dst_ip is None:
 498             dst_ip = self.nat_addr
 499         if not use_inside_ports:
 500             tcp_port = self.tcp_port_out
 501             udp_port = self.udp_port_out
 502             icmp_id = self.icmp_id_out
 503         else:
 504             tcp_port = self.tcp_port_in
 505             udp_port = self.udp_port_in
 506             icmp_id = self.icmp_id_in
 507         pkts = []
 508         # TCP
 509         p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
 510              IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 511              TCP(dport=tcp_port, sport=20))
 512         pkts.extend([p, p])
 513
 514         # UDP
 515         p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
 516              IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 517              UDP(dport=udp_port, sport=20))
 518         pkts.append(p)
 519
 520         # ICMP
 521         p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) /
 522              IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) /
 523              ICMP(id=icmp_id, type='echo-reply'))
 524         pkts.append(p)
 525
 526         return pkts
 527
 528     def create_tcp_stream(self, in_if, out_if, count):
 529         pkts = []
 530         port = 6303
 531
 532         for i in range(count):
 533             p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) /
 534                  IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=64) /
 535                  TCP(sport=port + i, dport=20))
 536             pkts.append(p)
 537
 538         return pkts
 539
 540     def create_stream_frag(self, src_if, dst, sport, dport, data,
 541                            proto=IP_PROTOS.tcp, echo_reply=False):
 542         if proto == IP_PROTOS.tcp:
 543             p = (IP(src=src_if.remote_ip4, dst=dst) /
 544                  TCP(sport=sport, dport=dport) /
 545                  Raw(data))
 546             p = p.__class__(scapy.compat.raw(p))
 547             chksum = p[TCP].chksum
 548             proto_header = TCP(sport=sport, dport=dport, chksum=chksum)
 549         elif proto == IP_PROTOS.udp:
 550             proto_header = UDP(sport=sport, dport=dport)
 551         elif proto == IP_PROTOS.icmp:
 552             if not echo_reply:
 553                 proto_header = ICMP(id=sport, type='echo-request')
 554             else:
 555                 proto_header = ICMP(id=sport, type='echo-reply')
 556         else:
 557             raise Exception("Unsupported protocol")
 558         id = self.random_port()
 559         pkts = []
 560         if proto == IP_PROTOS.tcp:
 561             raw = Raw(data[0:4])
 562         else:
 563             raw = Raw(data[0:16])
 564         p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
 565              IP(src=src_if.remote_ip4, dst=dst, flags="MF", frag=0, id=id) /
 566              proto_header /
 567              raw)
 568         pkts.append(p)
 569         if proto == IP_PROTOS.tcp:
 570             raw = Raw(data[4:20])
 571         else:
 572             raw = Raw(data[16:32])
 573         p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
 574              IP(src=src_if.remote_ip4, dst=dst, flags="MF", frag=3, id=id,
 575                 proto=proto) /
 576              raw)
 577         pkts.append(p)
 578         if proto == IP_PROTOS.tcp:
 579             raw = Raw(data[20:])
 580         else:
 581             raw = Raw(data[32:])
 582         p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
 583              IP(src=src_if.remote_ip4, dst=dst, frag=5, proto=proto,
 584                 id=id) /
 585              raw)
 586         pkts.append(p)
 587         return pkts
 588
 589     def frag_in_order_in_plus_out(self, in_addr, out_addr, in_port, out_port,
 590                                   proto=IP_PROTOS.tcp):
 591
 592         layer = self.proto2layer(proto)
 593
 594         if proto == IP_PROTOS.tcp:
 595             data = b"A" * 4 + b"B" * 16 + b"C" * 3
 596         else:
 597             data = b"A" * 16 + b"B" * 16 + b"C" * 3
 598         port_in = self.random_port()
 599
 600         for i in range(2):
 601             # out2in
 602             pkts = self.create_stream_frag(self.pg0, out_addr,
 603                                            port_in, out_port,
 604                                            data, proto)
 605             self.pg0.add_stream(pkts)
 606             self.pg_enable_capture(self.pg_interfaces)
 607             self.pg_start()
 608             frags = self.pg1.get_capture(len(pkts))
 609             p = self.reass_frags_and_verify(frags,
 610                                             self.pg0.remote_ip4,
 611                                             in_addr)
 612             if proto != IP_PROTOS.icmp:
 613                 self.assertEqual(p[layer].sport, port_in)
 614                 self.assertEqual(p[layer].dport, in_port)
 615             else:
 616                 self.assertEqual(p[layer].id, port_in)
 617             self.assertEqual(data, p[Raw].load)
 618
 619             # in2out
 620             if proto != IP_PROTOS.icmp:
 621                 pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
 622                                                in_port,
 623                                                p[layer].sport, data, proto)
 624             else:
 625                 pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
 626                                                p[layer].id, 0, data, proto,
 627                                                echo_reply=True)
 628             self.pg1.add_stream(pkts)
 629             self.pg_enable_capture(self.pg_interfaces)
 630             self.pg_start()
 631             frags = self.pg0.get_capture(len(pkts))
 632             p = self.reass_frags_and_verify(frags,
 633                                             out_addr,
 634                                             self.pg0.remote_ip4)
 635             if proto != IP_PROTOS.icmp:
 636                 self.assertEqual(p[layer].sport, out_port)
 637                 self.assertEqual(p[layer].dport, port_in)
 638             else:
 639                 self.assertEqual(p[layer].id, port_in)
 640             self.assertEqual(data, p[Raw].load)
 641
 642     def frag_out_of_order_in_plus_out(self, in_addr, out_addr, in_port,
 643                                       out_port, proto=IP_PROTOS.tcp):
 644
 645         layer = self.proto2layer(proto)
 646
 647         if proto == IP_PROTOS.tcp:
 648             data = b"A" * 4 + b"B" * 16 + b"C" * 3
 649         else:
 650             data = b"A" * 16 + b"B" * 16 + b"C" * 3
 651         port_in = self.random_port()
 652
 653         for i in range(2):
 654             # out2in
 655             pkts = self.create_stream_frag(self.pg0, out_addr,
 656                                            port_in, out_port,
 657                                            data, proto)
 658             pkts.reverse()
 659             self.pg0.add_stream(pkts)
 660             self.pg_enable_capture(self.pg_interfaces)
 661             self.pg_start()
 662             frags = self.pg1.get_capture(len(pkts))
 663             p = self.reass_frags_and_verify(frags,
 664                                             self.pg0.remote_ip4,
 665                                             in_addr)
 666             if proto != IP_PROTOS.icmp:
 667                 self.assertEqual(p[layer].dport, in_port)
 668                 self.assertEqual(p[layer].sport, port_in)
 669                 self.assertEqual(p[layer].dport, in_port)
 670             else:
 671                 self.assertEqual(p[layer].id, port_in)
 672             self.assertEqual(data, p[Raw].load)
 673
 674             # in2out
 675             if proto != IP_PROTOS.icmp:
 676                 pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
 677                                                in_port,
 678                                                p[layer].sport, data, proto)
 679             else:
 680                 pkts = self.create_stream_frag(self.pg1, self.pg0.remote_ip4,
 681                                                p[layer].id, 0, data, proto,
 682                                                echo_reply=True)
 683             pkts.reverse()
 684             self.pg1.add_stream(pkts)
 685             self.pg_enable_capture(self.pg_interfaces)
 686             self.pg_start()
 687             frags = self.pg0.get_capture(len(pkts))
 688             p = self.reass_frags_and_verify(frags,
 689                                             out_addr,
 690                                             self.pg0.remote_ip4)
 691             if proto != IP_PROTOS.icmp:
 692                 self.assertEqual(p[layer].sport, out_port)
 693                 self.assertEqual(p[layer].dport, port_in)
 694             else:
 695                 self.assertEqual(p[layer].id, port_in)
 696             self.assertEqual(data, p[Raw].load)
 697
 698     def init_tcp_session(self, in_if, out_if, in_port, ext_port):
 699         # SYN packet in->out
 700         p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
 701              IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
 702              TCP(sport=in_port, dport=ext_port, flags="S"))
 703         in_if.add_stream(p)
 704         self.pg_enable_capture(self.pg_interfaces)
 705         self.pg_start()
 706         capture = out_if.get_capture(1)
 707         p = capture[0]
 708         out_port = p[TCP].sport
 709
 710         # SYN + ACK packet out->in
 711         p = (Ether(src=out_if.remote_mac, dst=out_if.local_mac) /
 712              IP(src=out_if.remote_ip4, dst=self.nat_addr) /
 713              TCP(sport=ext_port, dport=out_port, flags="SA"))
 714         out_if.add_stream(p)
 715         self.pg_enable_capture(self.pg_interfaces)
 716         self.pg_start()
 717         in_if.get_capture(1)
 718
 719         # ACK packet in->out
 720         p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
 721              IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
 722              TCP(sport=in_port, dport=ext_port, flags="A"))
 723         in_if.add_stream(p)
 724         self.pg_enable_capture(self.pg_interfaces)
 725         self.pg_start()
 726         out_if.get_capture(1)
 727
 728         return out_port
 729
 730     def twice_nat_common(self, self_twice_nat=False, same_pg=False, lb=False,
 731                          client_id=None):
 732         twice_nat_addr = '10.0.1.3'
 733
 734         port_in = 8080
 735         if lb:
 736             if not same_pg:
 737                 port_in1 = port_in
 738                 port_in2 = port_in
 739             else:
 740                 port_in1 = port_in + 1
 741                 port_in2 = port_in + 2
 742
 743         port_out = 80
 744         eh_port_out = 4567
 745
 746         server1 = self.pg0.remote_hosts[0]
 747         server2 = self.pg0.remote_hosts[1]
 748         if lb and same_pg:
 749             server2 = server1
 750         if not lb:
 751             server = server1
 752
 753         pg0 = self.pg0
 754         if same_pg:
 755             pg1 = self.pg0
 756         else:
 757             pg1 = self.pg1
 758
 759         eh_translate = ((not self_twice_nat) or (not lb and same_pg) or
 760                         client_id == 1)
 761
 762         self.nat_add_address(self.nat_addr)
 763         self.nat_add_address(twice_nat_addr, twice_nat=1)
 764
 765         flags = 0
 766         if self_twice_nat:
 767             flags |= self.config_flags.NAT_IS_SELF_TWICE_NAT
 768         else:
 769             flags |= self.config_flags.NAT_IS_TWICE_NAT
 770
 771         if not lb:
 772             self.nat_add_static_mapping(pg0.remote_ip4, self.nat_addr,
 773                                         port_in, port_out,
 774                                         proto=IP_PROTOS.tcp,
 775                                         flags=flags)
 776         else:
 777             locals = [{'addr': server1.ip4,
 778                        'port': port_in1,
 779                        'probability': 50,
 780                        'vrf_id': 0},
 781                       {'addr': server2.ip4,
 782                        'port': port_in2,
 783                        'probability': 50,
 784                        'vrf_id': 0}]
 785             out_addr = self.nat_addr
 786
 787             self.vapi.nat44_add_del_lb_static_mapping(is_add=1, flags=flags,
 788                                                       external_addr=out_addr,
 789                                                       external_port=port_out,
 790                                                       protocol=IP_PROTOS.tcp,
 791                                                       local_num=len(locals),
 792                                                       locals=locals)
 793         self.nat_add_inside_interface(pg0)
 794         self.nat_add_outside_interface(pg1)
 795
 796         if same_pg:
 797             if not lb:
 798                 client = server
 799             else:
 800                 assert client_id is not None
 801                 if client_id == 1:
 802                     client = self.pg0.remote_hosts[0]
 803                 elif client_id == 2:
 804                     client = self.pg0.remote_hosts[1]
 805         else:
 806             client = pg1.remote_hosts[0]
 807         p = (Ether(src=pg1.remote_mac, dst=pg1.local_mac) /
 808              IP(src=client.ip4, dst=self.nat_addr) /
 809              TCP(sport=eh_port_out, dport=port_out))
 810         pg1.add_stream(p)
 811         self.pg_enable_capture(self.pg_interfaces)
 812         self.pg_start()
 813         capture = pg0.get_capture(1)
 814         p = capture[0]
 815         try:
 816             ip = p[IP]
 817             tcp = p[TCP]
 818             if lb:
 819                 if ip.dst == server1.ip4:
 820                     server = server1
 821                     port_in = port_in1
 822                 else:
 823                     server = server2
 824                     port_in = port_in2
 825             self.assertEqual(ip.dst, server.ip4)
 826             if lb and same_pg:
 827                 self.assertIn(tcp.dport, [port_in1, port_in2])
 828             else:
 829                 self.assertEqual(tcp.dport, port_in)
 830             if eh_translate:
 831                 self.assertEqual(ip.src, twice_nat_addr)
 832                 self.assertNotEqual(tcp.sport, eh_port_out)
 833             else:
 834                 self.assertEqual(ip.src, client.ip4)
 835                 self.assertEqual(tcp.sport, eh_port_out)
 836             eh_addr_in = ip.src
 837             eh_port_in = tcp.sport
 838             saved_port_in = tcp.dport
 839             self.assert_packet_checksums_valid(p)
 840         except:
 841             self.logger.error(ppp("Unexpected or invalid packet:", p))
 842             raise
 843
 844         p = (Ether(src=server.mac, dst=pg0.local_mac) /
 845              IP(src=server.ip4, dst=eh_addr_in) /
 846              TCP(sport=saved_port_in, dport=eh_port_in))
 847         pg0.add_stream(p)
 848         self.pg_enable_capture(self.pg_interfaces)
 849         self.pg_start()
 850         capture = pg1.get_capture(1)
 851         p = capture[0]
 852         try:
 853             ip = p[IP]
 854             tcp = p[TCP]
 855             self.assertEqual(ip.dst, client.ip4)
 856             self.assertEqual(ip.src, self.nat_addr)
 857             self.assertEqual(tcp.dport, eh_port_out)
 858             self.assertEqual(tcp.sport, port_out)
 859             self.assert_packet_checksums_valid(p)
 860         except:
 861             self.logger.error(ppp("Unexpected or invalid packet:", p))
 862             raise
 863
 864         if eh_translate:
 865             sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
 866             self.assertEqual(len(sessions), 1)
 867             self.assertTrue(sessions[0].flags &
 868                             self.config_flags.NAT_IS_EXT_HOST_VALID)
 869             self.assertTrue(sessions[0].flags &
 870                             self.config_flags.NAT_IS_TWICE_NAT)
 871             self.logger.info(self.vapi.cli("show nat44 sessions"))
 872             self.vapi.nat44_del_session(
 873                 address=sessions[0].inside_ip_address,
 874                 port=sessions[0].inside_port,
 875                 protocol=sessions[0].protocol,
 876                 flags=(self.config_flags.NAT_IS_INSIDE |
 877                        self.config_flags.NAT_IS_EXT_HOST_VALID),
 878                 ext_host_address=sessions[0].ext_host_nat_address,
 879                 ext_host_port=sessions[0].ext_host_nat_port)
 880             sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
 881             self.assertEqual(len(sessions), 0)
 882
 883     def verify_syslog_sess(self, data, is_add=True, is_ip6=False):
 884         message = data.decode('utf-8')
 885         try:
 886             message = SyslogMessage.parse(message)
 887         except ParseError as e:
 888             self.logger.error(e)
 889             raise
 890         else:
 891             self.assertEqual(message.severity, SyslogSeverity.info)
 892             self.assertEqual(message.appname, 'NAT')
 893             self.assertEqual(message.msgid, 'SADD' if is_add else 'SDEL')
 894             sd_params = message.sd.get('nsess')
 895             self.assertTrue(sd_params is not None)
 896             if is_ip6:
 897                 self.assertEqual(sd_params.get('IATYP'), 'IPv6')
 898                 self.assertEqual(sd_params.get('ISADDR'), self.pg0.remote_ip6)
 899             else:
 900                 self.assertEqual(sd_params.get('IATYP'), 'IPv4')
 901                 self.assertEqual(sd_params.get('ISADDR'), self.pg0.remote_ip4)
 902                 self.assertTrue(sd_params.get('SSUBIX') is not None)
 903             self.assertEqual(sd_params.get('ISPORT'), "%d" % self.tcp_port_in)
 904             self.assertEqual(sd_params.get('XATYP'), 'IPv4')
 905             self.assertEqual(sd_params.get('XSADDR'), self.nat_addr)
 906             self.assertEqual(sd_params.get('XSPORT'), "%d" % self.tcp_port_out)
 907             self.assertEqual(sd_params.get('PROTO'), "%d" % IP_PROTOS.tcp)
 908             self.assertEqual(sd_params.get('SVLAN'), '0')
 909             self.assertEqual(sd_params.get('XDADDR'), self.pg1.remote_ip4)
 910             self.assertEqual(sd_params.get('XDPORT'),
 911                              "%d" % self.tcp_external_port)
 912
 913
 914 class TestNAT44ED(NAT44EDTestCase):
 915     """ NAT44ED Test Case """
 916
 917     def test_users_dump(self):
 918         """ NAT44ED API test - nat44_user_dump """
 919
 920         self.nat_add_address(self.nat_addr)
 921         self.nat_add_inside_interface(self.pg0)
 922         self.nat_add_outside_interface(self.pg1)
 923
 924         self.vapi.nat44_forwarding_enable_disable(enable=1)
 925
 926         local_ip = self.pg0.remote_ip4
 927         external_ip = self.nat_addr
 928         self.nat_add_static_mapping(local_ip, external_ip)
 929
 930         users = self.vapi.nat44_user_dump()
 931         self.assertEqual(len(users), 0)
 932
 933         # in2out - static mapping match
 934
 935         pkts = self.create_stream_out(self.pg1)
 936         self.pg1.add_stream(pkts)
 937         self.pg_enable_capture(self.pg_interfaces)
 938         self.pg_start()
 939         capture = self.pg0.get_capture(len(pkts))
 940         self.verify_capture_in(capture, self.pg0)
 941
 942         pkts = self.create_stream_in(self.pg0, self.pg1)
 943         self.pg0.add_stream(pkts)
 944         self.pg_enable_capture(self.pg_interfaces)
 945         self.pg_start()
 946         capture = self.pg1.get_capture(len(pkts))
 947         self.verify_capture_out(capture, same_port=True)
 948
 949         users = self.vapi.nat44_user_dump()
 950         self.assertEqual(len(users), 1)
 951         static_user = users[0]
 952         self.assertEqual(static_user.nstaticsessions, 3)
 953         self.assertEqual(static_user.nsessions, 0)
 954
 955         # in2out - no static mapping match (forwarding test)
 956
 957         host0 = self.pg0.remote_hosts[0]
 958         self.pg0.remote_hosts[0] = self.pg0.remote_hosts[1]
 959         try:
 960             pkts = self.create_stream_out(self.pg1,
 961                                           dst_ip=self.pg0.remote_ip4,
 962                                           use_inside_ports=True)
 963             self.pg1.add_stream(pkts)
 964             self.pg_enable_capture(self.pg_interfaces)
 965             self.pg_start()
 966             capture = self.pg0.get_capture(len(pkts))
 967             self.verify_capture_in(capture, self.pg0)
 968
 969             pkts = self.create_stream_in(self.pg0, self.pg1)
 970             self.pg0.add_stream(pkts)
 971             self.pg_enable_capture(self.pg_interfaces)
 972             self.pg_start()
 973             capture = self.pg1.get_capture(len(pkts))
 974             self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
 975                                     same_port=True)
 976         finally:
 977             self.pg0.remote_hosts[0] = host0
 978
 979         users = self.vapi.nat44_user_dump()
 980         self.assertEqual(len(users), 2)
 981         if str(users[0].ip_address) == self.pg0.remote_hosts[0].ip4:
 982             non_static_user = users[1]
 983             static_user = users[0]
 984         else:
 985             non_static_user = users[0]
 986             static_user = users[1]
 987         self.assertEqual(static_user.nstaticsessions, 3)
 988         self.assertEqual(static_user.nsessions, 0)
 989         self.assertEqual(non_static_user.nstaticsessions, 0)
 990         self.assertEqual(non_static_user.nsessions, 3)
 991
 992         users = self.vapi.nat44_user_dump()
 993         self.assertEqual(len(users), 2)
 994         if str(users[0].ip_address) == self.pg0.remote_hosts[0].ip4:
 995             non_static_user = users[1]
 996             static_user = users[0]
 997         else:
 998             non_static_user = users[0]
 999             static_user = users[1]
1000         self.assertEqual(static_user.nstaticsessions, 3)
1001         self.assertEqual(static_user.nsessions, 0)
1002         self.assertEqual(non_static_user.nstaticsessions, 0)
1003         self.assertEqual(non_static_user.nsessions, 3)
1004
1005     def test_frag_out_of_order_do_not_translate(self):
1006         """ NAT44ED don't translate fragments arriving out of order """
1007         self.nat_add_inside_interface(self.pg0)
1008         self.nat_add_outside_interface(self.pg1)
1009         self.vapi.nat44_forwarding_enable_disable(enable=True)
1010         self.frag_out_of_order(proto=IP_PROTOS.tcp, dont_translate=True)
1011
1012     def test_forwarding(self):
1013         """ NAT44ED forwarding test """
1014
1015         self.nat_add_inside_interface(self.pg0)
1016         self.nat_add_outside_interface(self.pg1)
1017         self.vapi.nat44_forwarding_enable_disable(enable=1)
1018
1019         real_ip = self.pg0.remote_ip4
1020         alias_ip = self.nat_addr
1021         flags = self.config_flags.NAT_IS_ADDR_ONLY
1022         self.vapi.nat44_add_del_static_mapping(is_add=1,
1023                                                local_ip_address=real_ip,
1024                                                external_ip_address=alias_ip,
1025                                                external_sw_if_index=0xFFFFFFFF,
1026                                                flags=flags)
1027
1028         try:
1029             # in2out - static mapping match
1030
1031             pkts = self.create_stream_out(self.pg1)
1032             self.pg1.add_stream(pkts)
1033             self.pg_enable_capture(self.pg_interfaces)
1034             self.pg_start()
1035             capture = self.pg0.get_capture(len(pkts))
1036             self.verify_capture_in(capture, self.pg0)
1037
1038             pkts = self.create_stream_in(self.pg0, self.pg1)
1039             self.pg0.add_stream(pkts)
1040             self.pg_enable_capture(self.pg_interfaces)
1041             self.pg_start()
1042             capture = self.pg1.get_capture(len(pkts))
1043             self.verify_capture_out(capture, same_port=True)
1044
1045             # in2out - no static mapping match
1046
1047             host0 = self.pg0.remote_hosts[0]
1048             self.pg0.remote_hosts[0] = self.pg0.remote_hosts[1]
1049             try:
1050                 pkts = self.create_stream_out(self.pg1,
1051                                               dst_ip=self.pg0.remote_ip4,
1052                                               use_inside_ports=True)
1053                 self.pg1.add_stream(pkts)
1054                 self.pg_enable_capture(self.pg_interfaces)
1055                 self.pg_start()
1056                 capture = self.pg0.get_capture(len(pkts))
1057                 self.verify_capture_in(capture, self.pg0)
1058
1059                 pkts = self.create_stream_in(self.pg0, self.pg1)
1060                 self.pg0.add_stream(pkts)
1061                 self.pg_enable_capture(self.pg_interfaces)
1062                 self.pg_start()
1063                 capture = self.pg1.get_capture(len(pkts))
1064                 self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
1065                                         same_port=True)
1066             finally:
1067                 self.pg0.remote_hosts[0] = host0
1068
1069             user = self.pg0.remote_hosts[1]
1070             sessions = self.vapi.nat44_user_session_dump(user.ip4, 0)
1071             self.assertEqual(len(sessions), 3)
1072             self.assertTrue(sessions[0].flags &
1073                             self.config_flags.NAT_IS_EXT_HOST_VALID)
1074             self.vapi.nat44_del_session(
1075                 address=sessions[0].inside_ip_address,
1076                 port=sessions[0].inside_port,
1077                 protocol=sessions[0].protocol,
1078                 flags=(self.config_flags.NAT_IS_INSIDE |
1079                        self.config_flags.NAT_IS_EXT_HOST_VALID),
1080                 ext_host_address=sessions[0].ext_host_address,
1081                 ext_host_port=sessions[0].ext_host_port)
1082             sessions = self.vapi.nat44_user_session_dump(user.ip4, 0)
1083             self.assertEqual(len(sessions), 2)
1084
1085         finally:
1086             self.vapi.nat44_forwarding_enable_disable(enable=0)
1087             flags = self.config_flags.NAT_IS_ADDR_ONLY
1088             self.vapi.nat44_add_del_static_mapping(
1089                 is_add=0,
1090                 local_ip_address=real_ip,
1091                 external_ip_address=alias_ip,
1092                 external_sw_if_index=0xFFFFFFFF,
1093                 flags=flags)
1094
1095     def test_output_feature_and_service2(self):
1096         """ NAT44ED interface output feature and service host direct access """
1097         self.vapi.nat44_forwarding_enable_disable(enable=1)
1098         self.nat_add_address(self.nat_addr)
1099
1100         self.vapi.nat44_interface_add_del_output_feature(
1101             sw_if_index=self.pg1.sw_if_index, is_add=1,)
1102
1103         # session initiated from service host - translate
1104         pkts = self.create_stream_in(self.pg0, self.pg1)
1105         self.pg0.add_stream(pkts)
1106         self.pg_enable_capture(self.pg_interfaces)
1107         self.pg_start()
1108         capture = self.pg1.get_capture(len(pkts))
1109         self.verify_capture_out(capture, ignore_port=True)
1110
1111         pkts = self.create_stream_out(self.pg1)
1112         self.pg1.add_stream(pkts)
1113         self.pg_enable_capture(self.pg_interfaces)
1114         self.pg_start()
1115         capture = self.pg0.get_capture(len(pkts))
1116         self.verify_capture_in(capture, self.pg0)
1117
1118         # session initiated from remote host - do not translate
1119         tcp_port_in = self.tcp_port_in
1120         udp_port_in = self.udp_port_in
1121         icmp_id_in = self.icmp_id_in
1122
1123         self.tcp_port_in = 60303
1124         self.udp_port_in = 60304
1125         self.icmp_id_in = 60305
1126
1127         try:
1128             pkts = self.create_stream_out(self.pg1,
1129                                           self.pg0.remote_ip4,
1130                                           use_inside_ports=True)
1131             self.pg1.add_stream(pkts)
1132             self.pg_enable_capture(self.pg_interfaces)
1133             self.pg_start()
1134             capture = self.pg0.get_capture(len(pkts))
1135             self.verify_capture_in(capture, self.pg0)
1136
1137             pkts = self.create_stream_in(self.pg0, self.pg1)
1138             self.pg0.add_stream(pkts)
1139             self.pg_enable_capture(self.pg_interfaces)
1140             self.pg_start()
1141             capture = self.pg1.get_capture(len(pkts))
1142             self.verify_capture_out(capture, nat_ip=self.pg0.remote_ip4,
1143                                     same_port=True)
1144         finally:
1145             self.tcp_port_in = tcp_port_in
1146             self.udp_port_in = udp_port_in
1147             self.icmp_id_in = icmp_id_in
1148
1149     def test_twice_nat(self):
1150         """ NAT44ED Twice NAT """
1151         self.twice_nat_common()
1152
1153     def test_self_twice_nat_positive(self):
1154         """ NAT44ED Self Twice NAT (positive test) """
1155         self.twice_nat_common(self_twice_nat=True, same_pg=True)
1156
1157     def test_self_twice_nat_lb_positive(self):
1158         """ NAT44ED Self Twice NAT local service load balancing (positive test)
1159         """
1160         self.twice_nat_common(lb=True, self_twice_nat=True, same_pg=True,
1161                               client_id=1)
1162
1163     def test_twice_nat_lb(self):
1164         """ NAT44ED Twice NAT local service load balancing """
1165         self.twice_nat_common(lb=True)
1166
1167     def test_output_feature(self):
1168         """ NAT44ED interface output feature (in2out postrouting) """
1169         self.vapi.nat44_forwarding_enable_disable(enable=1)
1170         self.nat_add_address(self.nat_addr)
1171
1172         self.nat_add_outside_interface(self.pg0)
1173         self.vapi.nat44_interface_add_del_output_feature(
1174             sw_if_index=self.pg1.sw_if_index, is_add=1)
1175
1176         # in2out
1177         pkts = self.create_stream_in(self.pg0, self.pg1)
1178         self.pg0.add_stream(pkts)
1179         self.pg_enable_capture(self.pg_interfaces)
1180         self.pg_start()
1181         capture = self.pg1.get_capture(len(pkts))
1182         self.verify_capture_out(capture, ignore_port=True)
1183
1184         # out2in
1185         pkts = self.create_stream_out(self.pg1)
1186         self.pg1.add_stream(pkts)
1187         self.pg_enable_capture(self.pg_interfaces)
1188         self.pg_start()
1189         capture = self.pg0.get_capture(len(pkts))
1190         self.verify_capture_in(capture, self.pg0)
1191
1192     def test_static_with_port_out2(self):
1193         """ NAT44ED 1:1 NAPT asymmetrical rule """
1194
1195         external_port = 80
1196         local_port = 8080
1197
1198         self.vapi.nat44_forwarding_enable_disable(enable=1)
1199         flags = self.config_flags.NAT_IS_OUT2IN_ONLY
1200         self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
1201                                     local_port, external_port,
1202                                     proto=IP_PROTOS.tcp, flags=flags)
1203
1204         self.nat_add_inside_interface(self.pg0)
1205         self.nat_add_outside_interface(self.pg1)
1206
1207         # from client to service
1208         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1209              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1210              TCP(sport=12345, dport=external_port))
1211         self.pg1.add_stream(p)
1212         self.pg_enable_capture(self.pg_interfaces)
1213         self.pg_start()
1214         capture = self.pg0.get_capture(1)
1215         p = capture[0]
1216         try:
1217             ip = p[IP]
1218             tcp = p[TCP]
1219             self.assertEqual(ip.dst, self.pg0.remote_ip4)
1220             self.assertEqual(tcp.dport, local_port)
1221             self.assert_packet_checksums_valid(p)
1222         except:
1223             self.logger.error(ppp("Unexpected or invalid packet:", p))
1224             raise
1225
1226         # ICMP error
1227         p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
1228              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
1229              ICMP(type=11) / capture[0][IP])
1230         self.pg0.add_stream(p)
1231         self.pg_enable_capture(self.pg_interfaces)
1232         self.pg_start()
1233         capture = self.pg1.get_capture(1)
1234         p = capture[0]
1235         try:
1236             self.assertEqual(p[IP].src, self.nat_addr)
1237             inner = p[IPerror]
1238             self.assertEqual(inner.dst, self.nat_addr)
1239             self.assertEqual(inner[TCPerror].dport, external_port)
1240         except:
1241             self.logger.error(ppp("Unexpected or invalid packet:", p))
1242             raise
1243
1244         # from service back to client
1245         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1246              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
1247              TCP(sport=local_port, dport=12345))
1248         self.pg0.add_stream(p)
1249         self.pg_enable_capture(self.pg_interfaces)
1250         self.pg_start()
1251         capture = self.pg1.get_capture(1)
1252         p = capture[0]
1253         try:
1254             ip = p[IP]
1255             tcp = p[TCP]
1256             self.assertEqual(ip.src, self.nat_addr)
1257             self.assertEqual(tcp.sport, external_port)
1258             self.assert_packet_checksums_valid(p)
1259         except:
1260             self.logger.error(ppp("Unexpected or invalid packet:", p))
1261             raise
1262
1263         # ICMP error
1264         p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
1265              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1266              ICMP(type=11) / capture[0][IP])
1267         self.pg1.add_stream(p)
1268         self.pg_enable_capture(self.pg_interfaces)
1269         self.pg_start()
1270         capture = self.pg0.get_capture(1)
1271         p = capture[0]
1272         try:
1273             self.assertEqual(p[IP].dst, self.pg0.remote_ip4)
1274             inner = p[IPerror]
1275             self.assertEqual(inner.src, self.pg0.remote_ip4)
1276             self.assertEqual(inner[TCPerror].sport, local_port)
1277         except:
1278             self.logger.error(ppp("Unexpected or invalid packet:", p))
1279             raise
1280
1281         # from client to server (no translation)
1282         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1283              IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
1284              TCP(sport=12346, dport=local_port))
1285         self.pg1.add_stream(p)
1286         self.pg_enable_capture(self.pg_interfaces)
1287         self.pg_start()
1288         capture = self.pg0.get_capture(1)
1289         p = capture[0]
1290         try:
1291             ip = p[IP]
1292             tcp = p[TCP]
1293             self.assertEqual(ip.dst, self.pg0.remote_ip4)
1294             self.assertEqual(tcp.dport, local_port)
1295             self.assert_packet_checksums_valid(p)
1296         except:
1297             self.logger.error(ppp("Unexpected or invalid packet:", p))
1298             raise
1299
1300         # from service back to client (no translation)
1301         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1302              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
1303              TCP(sport=local_port, dport=12346))
1304         self.pg0.add_stream(p)
1305         self.pg_enable_capture(self.pg_interfaces)
1306         self.pg_start()
1307         capture = self.pg1.get_capture(1)
1308         p = capture[0]
1309         try:
1310             ip = p[IP]
1311             tcp = p[TCP]
1312             self.assertEqual(ip.src, self.pg0.remote_ip4)
1313             self.assertEqual(tcp.sport, local_port)
1314             self.assert_packet_checksums_valid(p)
1315         except:
1316             self.logger.error(ppp("Unexpected or invalid packet:", p))
1317             raise
1318
1319     def test_static_lb(self):
1320         """ NAT44ED local service load balancing """
1321         external_addr_n = self.nat_addr
1322         external_port = 80
1323         local_port = 8080
1324         server1 = self.pg0.remote_hosts[0]
1325         server2 = self.pg0.remote_hosts[1]
1326
1327         locals = [{'addr': server1.ip4,
1328                    'port': local_port,
1329                    'probability': 70,
1330                    'vrf_id': 0},
1331                   {'addr': server2.ip4,
1332                    'port': local_port,
1333                    'probability': 30,
1334                    'vrf_id': 0}]
1335
1336         self.nat_add_address(self.nat_addr)
1337         self.vapi.nat44_add_del_lb_static_mapping(
1338             is_add=1,
1339             external_addr=external_addr_n,
1340             external_port=external_port,
1341             protocol=IP_PROTOS.tcp,
1342             local_num=len(locals),
1343             locals=locals)
1344         flags = self.config_flags.NAT_IS_INSIDE
1345         self.vapi.nat44_interface_add_del_feature(
1346             sw_if_index=self.pg0.sw_if_index,
1347             flags=flags, is_add=1)
1348         self.vapi.nat44_interface_add_del_feature(
1349             sw_if_index=self.pg1.sw_if_index,
1350             is_add=1)
1351
1352         # from client to service
1353         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1354              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1355              TCP(sport=12345, dport=external_port))
1356         self.pg1.add_stream(p)
1357         self.pg_enable_capture(self.pg_interfaces)
1358         self.pg_start()
1359         capture = self.pg0.get_capture(1)
1360         p = capture[0]
1361         server = None
1362         try:
1363             ip = p[IP]
1364             tcp = p[TCP]
1365             self.assertIn(ip.dst, [server1.ip4, server2.ip4])
1366             if ip.dst == server1.ip4:
1367                 server = server1
1368             else:
1369                 server = server2
1370             self.assertEqual(tcp.dport, local_port)
1371             self.assert_packet_checksums_valid(p)
1372         except:
1373             self.logger.error(ppp("Unexpected or invalid packet:", p))
1374             raise
1375
1376         # from service back to client
1377         p = (Ether(src=server.mac, dst=self.pg0.local_mac) /
1378              IP(src=server.ip4, dst=self.pg1.remote_ip4) /
1379              TCP(sport=local_port, dport=12345))
1380         self.pg0.add_stream(p)
1381         self.pg_enable_capture(self.pg_interfaces)
1382         self.pg_start()
1383         capture = self.pg1.get_capture(1)
1384         p = capture[0]
1385         try:
1386             ip = p[IP]
1387             tcp = p[TCP]
1388             self.assertEqual(ip.src, self.nat_addr)
1389             self.assertEqual(tcp.sport, external_port)
1390             self.assert_packet_checksums_valid(p)
1391         except:
1392             self.logger.error(ppp("Unexpected or invalid packet:", p))
1393             raise
1394
1395         sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
1396         self.assertEqual(len(sessions), 1)
1397         self.assertTrue(sessions[0].flags &
1398                         self.config_flags.NAT_IS_EXT_HOST_VALID)
1399         self.vapi.nat44_del_session(
1400             address=sessions[0].inside_ip_address,
1401             port=sessions[0].inside_port,
1402             protocol=sessions[0].protocol,
1403             flags=(self.config_flags.NAT_IS_INSIDE |
1404                    self.config_flags.NAT_IS_EXT_HOST_VALID),
1405             ext_host_address=sessions[0].ext_host_address,
1406             ext_host_port=sessions[0].ext_host_port)
1407         sessions = self.vapi.nat44_user_session_dump(server.ip4, 0)
1408         self.assertEqual(len(sessions), 0)
1409
1410     def test_static_lb_2(self):
1411         """ NAT44ED local service load balancing (asymmetrical rule) """
1412         external_addr = self.nat_addr
1413         external_port = 80
1414         local_port = 8080
1415         server1 = self.pg0.remote_hosts[0]
1416         server2 = self.pg0.remote_hosts[1]
1417
1418         locals = [{'addr': server1.ip4,
1419                    'port': local_port,
1420                    'probability': 70,
1421                    'vrf_id': 0},
1422                   {'addr': server2.ip4,
1423                    'port': local_port,
1424                    'probability': 30,
1425                    'vrf_id': 0}]
1426
1427         self.vapi.nat44_forwarding_enable_disable(enable=1)
1428         flags = self.config_flags.NAT_IS_OUT2IN_ONLY
1429         self.vapi.nat44_add_del_lb_static_mapping(is_add=1, flags=flags,
1430                                                   external_addr=external_addr,
1431                                                   external_port=external_port,
1432                                                   protocol=IP_PROTOS.tcp,
1433                                                   local_num=len(locals),
1434                                                   locals=locals)
1435         flags = self.config_flags.NAT_IS_INSIDE
1436         self.vapi.nat44_interface_add_del_feature(
1437             sw_if_index=self.pg0.sw_if_index,
1438             flags=flags, is_add=1)
1439         self.vapi.nat44_interface_add_del_feature(
1440             sw_if_index=self.pg1.sw_if_index,
1441             is_add=1)
1442
1443         # from client to service
1444         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1445              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1446              TCP(sport=12345, dport=external_port))
1447         self.pg1.add_stream(p)
1448         self.pg_enable_capture(self.pg_interfaces)
1449         self.pg_start()
1450         capture = self.pg0.get_capture(1)
1451         p = capture[0]
1452         server = None
1453         try:
1454             ip = p[IP]
1455             tcp = p[TCP]
1456             self.assertIn(ip.dst, [server1.ip4, server2.ip4])
1457             if ip.dst == server1.ip4:
1458                 server = server1
1459             else:
1460                 server = server2
1461             self.assertEqual(tcp.dport, local_port)
1462             self.assert_packet_checksums_valid(p)
1463         except:
1464             self.logger.error(ppp("Unexpected or invalid packet:", p))
1465             raise
1466
1467         # from service back to client
1468         p = (Ether(src=server.mac, dst=self.pg0.local_mac) /
1469              IP(src=server.ip4, dst=self.pg1.remote_ip4) /
1470              TCP(sport=local_port, dport=12345))
1471         self.pg0.add_stream(p)
1472         self.pg_enable_capture(self.pg_interfaces)
1473         self.pg_start()
1474         capture = self.pg1.get_capture(1)
1475         p = capture[0]
1476         try:
1477             ip = p[IP]
1478             tcp = p[TCP]
1479             self.assertEqual(ip.src, self.nat_addr)
1480             self.assertEqual(tcp.sport, external_port)
1481             self.assert_packet_checksums_valid(p)
1482         except:
1483             self.logger.error(ppp("Unexpected or invalid packet:", p))
1484             raise
1485
1486         # from client to server (no translation)
1487         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1488              IP(src=self.pg1.remote_ip4, dst=server1.ip4) /
1489              TCP(sport=12346, dport=local_port))
1490         self.pg1.add_stream(p)
1491         self.pg_enable_capture(self.pg_interfaces)
1492         self.pg_start()
1493         capture = self.pg0.get_capture(1)
1494         p = capture[0]
1495         server = None
1496         try:
1497             ip = p[IP]
1498             tcp = p[TCP]
1499             self.assertEqual(ip.dst, server1.ip4)
1500             self.assertEqual(tcp.dport, local_port)
1501             self.assert_packet_checksums_valid(p)
1502         except:
1503             self.logger.error(ppp("Unexpected or invalid packet:", p))
1504             raise
1505
1506         # from service back to client (no translation)
1507         p = (Ether(src=server1.mac, dst=self.pg0.local_mac) /
1508              IP(src=server1.ip4, dst=self.pg1.remote_ip4) /
1509              TCP(sport=local_port, dport=12346))
1510         self.pg0.add_stream(p)
1511         self.pg_enable_capture(self.pg_interfaces)
1512         self.pg_start()
1513         capture = self.pg1.get_capture(1)
1514         p = capture[0]
1515         try:
1516             ip = p[IP]
1517             tcp = p[TCP]
1518             self.assertEqual(ip.src, server1.ip4)
1519             self.assertEqual(tcp.sport, local_port)
1520             self.assert_packet_checksums_valid(p)
1521         except:
1522             self.logger.error(ppp("Unexpected or invalid packet:", p))
1523             raise
1524
1525     def test_lb_affinity(self):
1526         """ NAT44ED local service load balancing affinity """
1527         external_addr = self.nat_addr
1528         external_port = 80
1529         local_port = 8080
1530         server1 = self.pg0.remote_hosts[0]
1531         server2 = self.pg0.remote_hosts[1]
1532
1533         locals = [{'addr': server1.ip4,
1534                    'port': local_port,
1535                    'probability': 50,
1536                    'vrf_id': 0},
1537                   {'addr': server2.ip4,
1538                    'port': local_port,
1539                    'probability': 50,
1540                    'vrf_id': 0}]
1541
1542         self.nat_add_address(self.nat_addr)
1543         self.vapi.nat44_add_del_lb_static_mapping(is_add=1,
1544                                                   external_addr=external_addr,
1545                                                   external_port=external_port,
1546                                                   protocol=IP_PROTOS.tcp,
1547                                                   affinity=10800,
1548                                                   local_num=len(locals),
1549                                                   locals=locals)
1550         flags = self.config_flags.NAT_IS_INSIDE
1551         self.vapi.nat44_interface_add_del_feature(
1552             sw_if_index=self.pg0.sw_if_index,
1553             flags=flags, is_add=1)
1554         self.vapi.nat44_interface_add_del_feature(
1555             sw_if_index=self.pg1.sw_if_index,
1556             is_add=1)
1557
1558         p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
1559              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1560              TCP(sport=1025, dport=external_port))
1561         self.pg1.add_stream(p)
1562         self.pg_enable_capture(self.pg_interfaces)
1563         self.pg_start()
1564         capture = self.pg0.get_capture(1)
1565         backend = capture[0][IP].dst
1566
1567         sessions = self.vapi.nat44_user_session_dump(backend, 0)
1568         self.assertEqual(len(sessions), 1)
1569         self.assertTrue(sessions[0].flags &
1570                         self.config_flags.NAT_IS_EXT_HOST_VALID)
1571         self.vapi.nat44_del_session(
1572             address=sessions[0].inside_ip_address,
1573             port=sessions[0].inside_port,
1574             protocol=sessions[0].protocol,
1575             flags=(self.config_flags.NAT_IS_INSIDE |
1576                    self.config_flags.NAT_IS_EXT_HOST_VALID),
1577             ext_host_address=sessions[0].ext_host_address,
1578             ext_host_port=sessions[0].ext_host_port)
1579
1580         pkts = []
1581         for port in range(1030, 1100):
1582             p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
1583                  IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1584                  TCP(sport=port, dport=external_port))
1585             pkts.append(p)
1586         self.pg1.add_stream(pkts)
1587         self.pg_enable_capture(self.pg_interfaces)
1588         self.pg_start()
1589         capture = self.pg0.get_capture(len(pkts))
1590         for p in capture:
1591             self.assertEqual(p[IP].dst, backend)
1592
1593     def test_multiple_vrf(self):
1594         """ NAT44ED Multiple VRF setup """
1595
1596         external_addr = '1.2.3.4'
1597         external_port = 80
1598         local_port = 8080
1599         port = 0
1600
1601         self.vapi.nat44_forwarding_enable_disable(enable=1)
1602         self.nat_add_address(self.nat_addr)
1603         flags = self.config_flags.NAT_IS_INSIDE
1604         self.vapi.nat44_interface_add_del_feature(
1605             sw_if_index=self.pg0.sw_if_index,
1606             is_add=1)
1607         self.vapi.nat44_interface_add_del_feature(
1608             sw_if_index=self.pg0.sw_if_index,
1609             is_add=1, flags=flags)
1610         self.vapi.nat44_interface_add_del_output_feature(
1611             sw_if_index=self.pg1.sw_if_index,
1612             is_add=1)
1613         self.vapi.nat44_interface_add_del_feature(
1614             sw_if_index=self.pg5.sw_if_index,
1615             is_add=1)
1616         self.vapi.nat44_interface_add_del_feature(
1617             sw_if_index=self.pg5.sw_if_index,
1618             is_add=1, flags=flags)
1619         self.vapi.nat44_interface_add_del_feature(
1620             sw_if_index=self.pg6.sw_if_index,
1621             is_add=1)
1622         flags = self.config_flags.NAT_IS_OUT2IN_ONLY
1623         self.nat_add_static_mapping(self.pg5.remote_ip4, external_addr,
1624                                     local_port, external_port, vrf_id=1,
1625                                     proto=IP_PROTOS.tcp, flags=flags)
1626         self.nat_add_static_mapping(
1627             self.pg0.remote_ip4,
1628             external_sw_if_index=self.pg0.sw_if_index,
1629             local_port=local_port,
1630             vrf_id=0,
1631             external_port=external_port,
1632             proto=IP_PROTOS.tcp,
1633             flags=flags
1634         )
1635
1636         # from client to service (both VRF1)
1637         p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
1638              IP(src=self.pg6.remote_ip4, dst=external_addr) /
1639              TCP(sport=12345, dport=external_port))
1640         self.pg6.add_stream(p)
1641         self.pg_enable_capture(self.pg_interfaces)
1642         self.pg_start()
1643         capture = self.pg5.get_capture(1)
1644         p = capture[0]
1645         try:
1646             ip = p[IP]
1647             tcp = p[TCP]
1648             self.assertEqual(ip.dst, self.pg5.remote_ip4)
1649             self.assertEqual(tcp.dport, local_port)
1650             self.assert_packet_checksums_valid(p)
1651         except:
1652             self.logger.error(ppp("Unexpected or invalid packet:", p))
1653             raise
1654
1655         # from service back to client (both VRF1)
1656         p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
1657              IP(src=self.pg5.remote_ip4, dst=self.pg6.remote_ip4) /
1658              TCP(sport=local_port, dport=12345))
1659         self.pg5.add_stream(p)
1660         self.pg_enable_capture(self.pg_interfaces)
1661         self.pg_start()
1662         capture = self.pg6.get_capture(1)
1663         p = capture[0]
1664         try:
1665             ip = p[IP]
1666             tcp = p[TCP]
1667             self.assertEqual(ip.src, external_addr)
1668             self.assertEqual(tcp.sport, external_port)
1669             self.assert_packet_checksums_valid(p)
1670         except:
1671             self.logger.error(ppp("Unexpected or invalid packet:", p))
1672             raise
1673
1674         # dynamic NAT from VRF1 to VRF0 (output-feature)
1675         p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
1676              IP(src=self.pg5.remote_ip4, dst=self.pg1.remote_ip4) /
1677              TCP(sport=2345, dport=22))
1678         self.pg5.add_stream(p)
1679         self.pg_enable_capture(self.pg_interfaces)
1680         self.pg_start()
1681         capture = self.pg1.get_capture(1)
1682         p = capture[0]
1683         try:
1684             ip = p[IP]
1685             tcp = p[TCP]
1686             self.assertEqual(ip.src, self.nat_addr)
1687             self.assert_packet_checksums_valid(p)
1688             port = tcp.sport
1689         except:
1690             self.logger.error(ppp("Unexpected or invalid packet:", p))
1691             raise
1692
1693         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
1694              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
1695              TCP(sport=22, dport=port))
1696         self.pg1.add_stream(p)
1697         self.pg_enable_capture(self.pg_interfaces)
1698         self.pg_start()
1699         capture = self.pg5.get_capture(1)
1700         p = capture[0]
1701         try:
1702             ip = p[IP]
1703             tcp = p[TCP]
1704             self.assertEqual(ip.dst, self.pg5.remote_ip4)
1705             self.assertEqual(tcp.dport, 2345)
1706             self.assert_packet_checksums_valid(p)
1707         except:
1708             self.logger.error(ppp("Unexpected or invalid packet:", p))
1709             raise
1710
1711         # from client VRF1 to service VRF0
1712         p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
1713              IP(src=self.pg6.remote_ip4, dst=self.pg0.local_ip4) /
1714              TCP(sport=12346, dport=external_port))
1715         self.pg6.add_stream(p)
1716         self.pg_enable_capture(self.pg_interfaces)
1717         self.pg_start()
1718         capture = self.pg0.get_capture(1)
1719         p = capture[0]
1720         try:
1721             ip = p[IP]
1722             tcp = p[TCP]
1723             self.assertEqual(ip.dst, self.pg0.remote_ip4)
1724             self.assertEqual(tcp.dport, local_port)
1725             self.assert_packet_checksums_valid(p)
1726         except:
1727             self.logger.error(ppp("Unexpected or invalid packet:", p))
1728             raise
1729
1730         # from service VRF0 back to client VRF1
1731         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1732              IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
1733              TCP(sport=local_port, dport=12346))
1734         self.pg0.add_stream(p)
1735         self.pg_enable_capture(self.pg_interfaces)
1736         self.pg_start()
1737         capture = self.pg6.get_capture(1)
1738         p = capture[0]
1739         try:
1740             ip = p[IP]
1741             tcp = p[TCP]
1742             self.assertEqual(ip.src, self.pg0.local_ip4)
1743             self.assertEqual(tcp.sport, external_port)
1744             self.assert_packet_checksums_valid(p)
1745         except:
1746             self.logger.error(ppp("Unexpected or invalid packet:", p))
1747             raise
1748
1749         # from client VRF0 to service VRF1
1750         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1751              IP(src=self.pg0.remote_ip4, dst=external_addr) /
1752              TCP(sport=12347, dport=external_port))
1753         self.pg0.add_stream(p)
1754         self.pg_enable_capture(self.pg_interfaces)
1755         self.pg_start()
1756         capture = self.pg5.get_capture(1)
1757         p = capture[0]
1758         try:
1759             ip = p[IP]
1760             tcp = p[TCP]
1761             self.assertEqual(ip.dst, self.pg5.remote_ip4)
1762             self.assertEqual(tcp.dport, local_port)
1763             self.assert_packet_checksums_valid(p)
1764         except:
1765             self.logger.error(ppp("Unexpected or invalid packet:", p))
1766             raise
1767
1768         # from service VRF1 back to client VRF0
1769         p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
1770              IP(src=self.pg5.remote_ip4, dst=self.pg0.remote_ip4) /
1771              TCP(sport=local_port, dport=12347))
1772         self.pg5.add_stream(p)
1773         self.pg_enable_capture(self.pg_interfaces)
1774         self.pg_start()
1775         capture = self.pg0.get_capture(1)
1776         p = capture[0]
1777         try:
1778             ip = p[IP]
1779             tcp = p[TCP]
1780             self.assertEqual(ip.src, external_addr)
1781             self.assertEqual(tcp.sport, external_port)
1782             self.assert_packet_checksums_valid(p)
1783         except:
1784             self.logger.error(ppp("Unexpected or invalid packet:", p))
1785             raise
1786
1787         # from client to server (both VRF1, no translation)
1788         p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
1789              IP(src=self.pg6.remote_ip4, dst=self.pg5.remote_ip4) /
1790              TCP(sport=12348, dport=local_port))
1791         self.pg6.add_stream(p)
1792         self.pg_enable_capture(self.pg_interfaces)
1793         self.pg_start()
1794         capture = self.pg5.get_capture(1)
1795         p = capture[0]
1796         try:
1797             ip = p[IP]
1798             tcp = p[TCP]
1799             self.assertEqual(ip.dst, self.pg5.remote_ip4)
1800             self.assertEqual(tcp.dport, local_port)
1801             self.assert_packet_checksums_valid(p)
1802         except:
1803             self.logger.error(ppp("Unexpected or invalid packet:", p))
1804             raise
1805
1806         # from server back to client (both VRF1, no translation)
1807         p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
1808              IP(src=self.pg5.remote_ip4, dst=self.pg6.remote_ip4) /
1809              TCP(sport=local_port, dport=12348))
1810         self.pg5.add_stream(p)
1811         self.pg_enable_capture(self.pg_interfaces)
1812         self.pg_start()
1813         capture = self.pg6.get_capture(1)
1814         p = capture[0]
1815         try:
1816             ip = p[IP]
1817             tcp = p[TCP]
1818             self.assertEqual(ip.src, self.pg5.remote_ip4)
1819             self.assertEqual(tcp.sport, local_port)
1820             self.assert_packet_checksums_valid(p)
1821         except:
1822             self.logger.error(ppp("Unexpected or invalid packet:", p))
1823             raise
1824
1825         # from client VRF1 to server VRF0 (no translation)
1826         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1827              IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
1828              TCP(sport=local_port, dport=12349))
1829         self.pg0.add_stream(p)
1830         self.pg_enable_capture(self.pg_interfaces)
1831         self.pg_start()
1832         capture = self.pg6.get_capture(1)
1833         p = capture[0]
1834         try:
1835             ip = p[IP]
1836             tcp = p[TCP]
1837             self.assertEqual(ip.src, self.pg0.remote_ip4)
1838             self.assertEqual(tcp.sport, local_port)
1839             self.assert_packet_checksums_valid(p)
1840         except:
1841             self.logger.error(ppp("Unexpected or invalid packet:", p))
1842             raise
1843
1844         # from server VRF0 back to client VRF1 (no translation)
1845         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1846              IP(src=self.pg0.remote_ip4, dst=self.pg6.remote_ip4) /
1847              TCP(sport=local_port, dport=12349))
1848         self.pg0.add_stream(p)
1849         self.pg_enable_capture(self.pg_interfaces)
1850         self.pg_start()
1851         capture = self.pg6.get_capture(1)
1852         p = capture[0]
1853         try:
1854             ip = p[IP]
1855             tcp = p[TCP]
1856             self.assertEqual(ip.src, self.pg0.remote_ip4)
1857             self.assertEqual(tcp.sport, local_port)
1858             self.assert_packet_checksums_valid(p)
1859         except:
1860             self.logger.error(ppp("Unexpected or invalid packet:", p))
1861             raise
1862
1863         # from client VRF0 to server VRF1 (no translation)
1864         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
1865              IP(src=self.pg0.remote_ip4, dst=self.pg5.remote_ip4) /
1866              TCP(sport=12344, dport=local_port))
1867         self.pg0.add_stream(p)
1868         self.pg_enable_capture(self.pg_interfaces)
1869         self.pg_start()
1870         capture = self.pg5.get_capture(1)
1871         p = capture[0]
1872         try:
1873             ip = p[IP]
1874             tcp = p[TCP]
1875             self.assertEqual(ip.dst, self.pg5.remote_ip4)
1876             self.assertEqual(tcp.dport, local_port)
1877             self.assert_packet_checksums_valid(p)
1878         except:
1879             self.logger.error(ppp("Unexpected or invalid packet:", p))
1880             raise
1881
1882         # from server VRF1 back to client VRF0 (no translation)
1883         p = (Ether(src=self.pg5.remote_mac, dst=self.pg5.local_mac) /
1884              IP(src=self.pg5.remote_ip4, dst=self.pg0.remote_ip4) /
1885              TCP(sport=local_port, dport=12344))
1886         self.pg5.add_stream(p)
1887         self.pg_enable_capture(self.pg_interfaces)
1888         self.pg_start()
1889         capture = self.pg0.get_capture(1)
1890         p = capture[0]
1891         try:
1892             ip = p[IP]
1893             tcp = p[TCP]
1894             self.assertEqual(ip.src, self.pg5.remote_ip4)
1895             self.assertEqual(tcp.sport, local_port)
1896             self.assert_packet_checksums_valid(p)
1897         except:
1898             self.logger.error(ppp("Unexpected or invalid packet:", p))
1899             raise
1900
1901     def test_outside_address_distribution(self):
1902         """ Outside address distribution based on source address """
1903
1904         x = 100
1905         nat_addresses = []
1906
1907         for i in range(1, x):
1908             a = "10.0.0.%d" % i
1909             nat_addresses.append(a)
1910
1911         self.nat_add_inside_interface(self.pg0)
1912         self.nat_add_outside_interface(self.pg1)
1913
1914         self.vapi.nat44_add_del_address_range(
1915             first_ip_address=nat_addresses[0],
1916             last_ip_address=nat_addresses[-1],
1917             vrf_id=0xFFFFFFFF, is_add=1, flags=0)
1918
1919         self.pg0.generate_remote_hosts(x)
1920
1921         pkts = []
1922         for i in range(x):
1923             info = self.create_packet_info(self.pg0, self.pg1)
1924             payload = self.info_to_payload(info)
1925             p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
1926                  IP(src=self.pg0.remote_hosts[i].ip4,
1927                      dst=self.pg1.remote_ip4) /
1928                  UDP(sport=7000+i, dport=8000+i) /
1929                  Raw(payload))
1930             info.data = p
1931             pkts.append(p)
1932
1933         self.pg0.add_stream(pkts)
1934         self.pg_enable_capture(self.pg_interfaces)
1935         self.pg_start()
1936         recvd = self.pg1.get_capture(len(pkts))
1937         for p_recvd in recvd:
1938             payload_info = self.payload_to_info(p_recvd[Raw])
1939             packet_index = payload_info.index
1940             info = self._packet_infos[packet_index]
1941             self.assertTrue(info is not None)
1942             self.assertEqual(packet_index, info.index)
1943             p_sent = info.data
1944             packed = socket.inet_aton(p_sent[IP].src)
1945             numeric = struct.unpack("!L", packed)[0]
1946             numeric = socket.htonl(numeric)
1947             a = nat_addresses[(numeric-1) % len(nat_addresses)]
1948             self.assertEqual(
1949                 a, p_recvd[IP].src,
1950                 "Invalid packet (src IP %s translated to %s, but expected %s)"
1951                 % (p_sent[IP].src, p_recvd[IP].src, a))
1952
1953
1954 class TestNAT44EDMW(TestNAT44ED):
1955     """ NAT44ED MW Test Case """
1956     vpp_worker_count = 1
1957
1958     @unittest.skip('MW fix required')
1959     def test_users_dump(self):
1960         """ NAT44ED API test - nat44_user_dump """
1961
1962     @unittest.skip('MW fix required')
1963     def test_frag_out_of_order_do_not_translate(self):
1964         """ NAT44ED don't translate fragments arriving out of order """
1965
1966     @unittest.skip('MW fix required')
1967     def test_forwarding(self):
1968         """ NAT44ED forwarding test """
1969
1970     @unittest.skip('MW fix required')
1971     def test_twice_nat(self):
1972         """ NAT44ED Twice NAT """
1973
1974     @unittest.skip('MW fix required')
1975     def test_twice_nat_lb(self):
1976         """ NAT44ED Twice NAT local service load balancing """
1977
1978     @unittest.skip('MW fix required')
1979     def test_output_feature(self):
1980         """ NAT44ED interface output feature (in2out postrouting) """
1981
1982     @unittest.skip('MW fix required')
1983     def test_static_with_port_out2(self):
1984         """ NAT44ED 1:1 NAPT asymmetrical rule """
1985
1986     @unittest.skip('MW fix required')
1987     def test_output_feature_and_service2(self):
1988         """ NAT44ED interface output feature and service host direct access """
1989
1990     @unittest.skip('MW fix required')
1991     def test_static_lb(self):
1992         """ NAT44ED local service load balancing """
1993
1994     @unittest.skip('MW fix required')
1995     def test_static_lb_2(self):
1996         """ NAT44ED local service load balancing (asymmetrical rule) """
1997
1998     @unittest.skip('MW fix required')
1999     def test_lb_affinity(self):
2000         """ NAT44ED local service load balancing affinity """
2001
2002     @unittest.skip('MW fix required')
2003     def test_multiple_vrf(self):
2004         """ NAT44ED Multiple VRF setup """
2005
2006     @unittest.skip('MW fix required')
2007     def test_self_twice_nat_positive(self):
2008         """ NAT44ED Self Twice NAT (positive test) """
2009
2010     @unittest.skip('MW fix required')
2011     def test_self_twice_nat_lb_positive(self):
2012         """ NAT44ED Self Twice NAT local service load balancing (positive test)
2013         """
2014
2015     def test_dynamic(self):
2016         """ NAT44ED dynamic translation test """
2017
2018         self.nat_add_address(self.nat_addr)
2019         self.nat_add_inside_interface(self.pg0)
2020         self.nat_add_outside_interface(self.pg1)
2021
2022         # in2out
2023         tc1 = self.statistics['/nat44-ed/in2out/slowpath/tcp']
2024         uc1 = self.statistics['/nat44-ed/in2out/slowpath/udp']
2025         ic1 = self.statistics['/nat44-ed/in2out/slowpath/icmp']
2026         dc1 = self.statistics['/nat44-ed/in2out/slowpath/drops']
2027
2028         pkts = self.create_stream_in(self.pg0, self.pg1)
2029         # TODO: specify worker=idx, also stats have to
2030         #       know from which worker to take capture
2031         self.pg0.add_stream(pkts)
2032         self.pg_enable_capture(self.pg_interfaces)
2033         self.pg_start()
2034         capture = self.pg1.get_capture(len(pkts))
2035         self.verify_capture_out(capture, ignore_port=True)
2036
2037         if_idx = self.pg0.sw_if_index
2038         tc2 = self.statistics['/nat44-ed/in2out/slowpath/tcp']
2039         uc2 = self.statistics['/nat44-ed/in2out/slowpath/udp']
2040         ic2 = self.statistics['/nat44-ed/in2out/slowpath/icmp']
2041         dc2 = self.statistics['/nat44-ed/in2out/slowpath/drops']
2042
2043         self.assertEqual(tc2[:, if_idx].sum() - tc1[:, if_idx].sum(), 2)
2044         self.assertEqual(uc2[:, if_idx].sum() - uc1[:, if_idx].sum(), 1)
2045         self.assertEqual(ic2[:, if_idx].sum() - ic1[:, if_idx].sum(), 1)
2046         self.assertEqual(dc2[:, if_idx].sum() - dc1[:, if_idx].sum(), 0)
2047
2048         # out2in
2049         tc1 = self.statistics['/nat44-ed/out2in/fastpath/tcp']
2050         uc1 = self.statistics['/nat44-ed/out2in/fastpath/udp']
2051         ic1 = self.statistics['/nat44-ed/out2in/fastpath/icmp']
2052         dc1 = self.statistics['/nat44-ed/out2in/fastpath/drops']
2053
2054         pkts = self.create_stream_out(self.pg1)
2055         self.pg1.add_stream(pkts)
2056         self.pg_enable_capture(self.pg_interfaces)
2057         self.pg_start()
2058         capture = self.pg0.get_capture(len(pkts))
2059         self.verify_capture_in(capture, self.pg0)
2060
2061         if_idx = self.pg1.sw_if_index
2062         tc2 = self.statistics['/nat44-ed/out2in/fastpath/tcp']
2063         uc2 = self.statistics['/nat44-ed/out2in/fastpath/udp']
2064         ic2 = self.statistics['/nat44-ed/out2in/fastpath/icmp']
2065         dc2 = self.statistics['/nat44-ed/out2in/fastpath/drops']
2066
2067         self.assertEqual(tc2[:, if_idx].sum() - tc1[:, if_idx].sum(), 2)
2068         self.assertEqual(uc2[:, if_idx].sum() - uc1[:, if_idx].sum(), 1)
2069         self.assertEqual(ic2[:, if_idx].sum() - ic1[:, if_idx].sum(), 1)
2070         self.assertEqual(dc2[:, if_idx].sum() - dc1[:, if_idx].sum(), 0)
2071
2072         sc = self.statistics['/nat44-ed/total-sessions']
2073         self.assertEqual(sc[:, 0].sum(), 3)
2074
2075     def test_frag_in_order(self):
2076         """ NAT44ED translate fragments arriving in order """
2077
2078         self.nat_add_address(self.nat_addr)
2079         self.nat_add_inside_interface(self.pg0)
2080         self.nat_add_outside_interface(self.pg1)
2081
2082         self.frag_in_order(proto=IP_PROTOS.tcp, ignore_port=True)
2083         self.frag_in_order(proto=IP_PROTOS.udp, ignore_port=True)
2084         self.frag_in_order(proto=IP_PROTOS.icmp, ignore_port=True)
2085
2086     def test_frag_in_order_do_not_translate(self):
2087         """ NAT44ED don't translate fragments arriving in order """
2088
2089         self.nat_add_address(self.nat_addr)
2090         self.nat_add_inside_interface(self.pg0)
2091         self.nat_add_outside_interface(self.pg1)
2092         self.vapi.nat44_forwarding_enable_disable(enable=True)
2093
2094         self.frag_in_order(proto=IP_PROTOS.tcp, dont_translate=True)
2095
2096     def test_frag_out_of_order(self):
2097         """ NAT44ED translate fragments arriving out of order """
2098
2099         self.nat_add_address(self.nat_addr)
2100         self.nat_add_inside_interface(self.pg0)
2101         self.nat_add_outside_interface(self.pg1)
2102
2103         self.frag_out_of_order(proto=IP_PROTOS.tcp, ignore_port=True)
2104         self.frag_out_of_order(proto=IP_PROTOS.udp, ignore_port=True)
2105         self.frag_out_of_order(proto=IP_PROTOS.icmp, ignore_port=True)
2106
2107     def test_frag_in_order_in_plus_out(self):
2108         """ NAT44ED in+out interface fragments in order """
2109
2110         in_port = self.random_port()
2111         out_port = self.random_port()
2112
2113         self.nat_add_address(self.nat_addr)
2114         self.nat_add_inside_interface(self.pg0)
2115         self.nat_add_outside_interface(self.pg0)
2116         self.nat_add_inside_interface(self.pg1)
2117         self.nat_add_outside_interface(self.pg1)
2118
2119         # add static mappings for server
2120         self.nat_add_static_mapping(self.server_addr,
2121                                     self.nat_addr,
2122                                     in_port,
2123                                     out_port,
2124                                     proto=IP_PROTOS.tcp)
2125         self.nat_add_static_mapping(self.server_addr,
2126                                     self.nat_addr,
2127                                     in_port,
2128                                     out_port,
2129                                     proto=IP_PROTOS.udp)
2130         self.nat_add_static_mapping(self.server_addr,
2131                                     self.nat_addr,
2132                                     proto=IP_PROTOS.icmp)
2133
2134         # run tests for each protocol
2135         self.frag_in_order_in_plus_out(self.server_addr,
2136                                        self.nat_addr,
2137                                        in_port,
2138                                        out_port,
2139                                        IP_PROTOS.tcp)
2140         self.frag_in_order_in_plus_out(self.server_addr,
2141                                        self.nat_addr,
2142                                        in_port,
2143                                        out_port,
2144                                        IP_PROTOS.udp)
2145         self.frag_in_order_in_plus_out(self.server_addr,
2146                                        self.nat_addr,
2147                                        in_port,
2148                                        out_port,
2149                                        IP_PROTOS.icmp)
2150
2151     def test_frag_out_of_order_in_plus_out(self):
2152         """ NAT44ED in+out interface fragments out of order """
2153
2154         in_port = self.random_port()
2155         out_port = self.random_port()
2156
2157         self.nat_add_address(self.nat_addr)
2158         self.nat_add_inside_interface(self.pg0)
2159         self.nat_add_outside_interface(self.pg0)
2160         self.nat_add_inside_interface(self.pg1)
2161         self.nat_add_outside_interface(self.pg1)
2162
2163         # add static mappings for server
2164         self.nat_add_static_mapping(self.server_addr,
2165                                     self.nat_addr,
2166                                     in_port,
2167                                     out_port,
2168                                     proto=IP_PROTOS.tcp)
2169         self.nat_add_static_mapping(self.server_addr,
2170                                     self.nat_addr,
2171                                     in_port,
2172                                     out_port,
2173                                     proto=IP_PROTOS.udp)
2174         self.nat_add_static_mapping(self.server_addr,
2175                                     self.nat_addr,
2176                                     proto=IP_PROTOS.icmp)
2177
2178         # run tests for each protocol
2179         self.frag_out_of_order_in_plus_out(self.server_addr,
2180                                            self.nat_addr,
2181                                            in_port,
2182                                            out_port,
2183                                            IP_PROTOS.tcp)
2184         self.frag_out_of_order_in_plus_out(self.server_addr,
2185                                            self.nat_addr,
2186                                            in_port,
2187                                            out_port,
2188                                            IP_PROTOS.udp)
2189         self.frag_out_of_order_in_plus_out(self.server_addr,
2190                                            self.nat_addr,
2191                                            in_port,
2192                                            out_port,
2193                                            IP_PROTOS.icmp)
2194
2195     def test_reass_hairpinning(self):
2196         """ NAT44ED fragments hairpinning """
2197
2198         server_addr = self.pg0.remote_hosts[1].ip4
2199
2200         host_in_port = self.random_port()
2201         server_in_port = self.random_port()
2202         server_out_port = self.random_port()
2203
2204         self.nat_add_address(self.nat_addr)
2205         self.nat_add_inside_interface(self.pg0)
2206         self.nat_add_outside_interface(self.pg1)
2207
2208         # add static mapping for server
2209         self.nat_add_static_mapping(server_addr, self.nat_addr,
2210                                     server_in_port, server_out_port,
2211                                     proto=IP_PROTOS.tcp)
2212         self.nat_add_static_mapping(server_addr, self.nat_addr,
2213                                     server_in_port, server_out_port,
2214                                     proto=IP_PROTOS.udp)
2215         self.nat_add_static_mapping(server_addr, self.nat_addr)
2216
2217         self.reass_hairpinning(server_addr, server_in_port, server_out_port,
2218                                host_in_port, proto=IP_PROTOS.tcp,
2219                                ignore_port=True)
2220         self.reass_hairpinning(server_addr, server_in_port, server_out_port,
2221                                host_in_port, proto=IP_PROTOS.udp,
2222                                ignore_port=True)
2223         self.reass_hairpinning(server_addr, server_in_port, server_out_port,
2224                                host_in_port, proto=IP_PROTOS.icmp,
2225                                ignore_port=True)
2226
2227     def test_session_limit_per_vrf(self):
2228         """ NAT44ED per vrf session limit """
2229
2230         inside = self.pg0
2231         inside_vrf10 = self.pg2
2232         outside = self.pg1
2233
2234         limit = 5
2235
2236         # 2 interfaces pg0, pg1 (vrf10, limit 1 tcp session)
2237         # non existing vrf_id makes process core dump
2238         self.vapi.nat44_set_session_limit(session_limit=limit, vrf_id=10)
2239
2240         self.nat_add_inside_interface(inside)
2241         self.nat_add_inside_interface(inside_vrf10)
2242         self.nat_add_outside_interface(outside)
2243
2244         # vrf independent
2245         self.nat_add_interface_address(outside)
2246
2247         # BUG: causing core dump - when bad vrf_id is specified
2248         # self.nat_add_address(outside.local_ip4, vrf_id=20)
2249
2250         stream = self.create_tcp_stream(inside_vrf10, outside, limit * 2)
2251         inside_vrf10.add_stream(stream)
2252
2253         self.pg_enable_capture(self.pg_interfaces)
2254         self.pg_start()
2255
2256         capture = outside.get_capture(limit)
2257
2258         stream = self.create_tcp_stream(inside, outside, limit * 2)
2259         inside.add_stream(stream)
2260
2261         self.pg_enable_capture(self.pg_interfaces)
2262         self.pg_start()
2263
2264         capture = outside.get_capture(len(stream))
2265
2266     def test_show_max_translations(self):
2267         """ NAT44ED API test - max translations per thread """
2268         nat_config = self.vapi.nat_show_config_2()
2269         self.assertEqual(self.max_sessions,
2270                          nat_config.max_translations_per_thread)
2271
2272     def test_lru_cleanup(self):
2273         """ NAT44ED LRU cleanup algorithm """
2274
2275         self.nat_add_address(self.nat_addr)
2276         self.nat_add_inside_interface(self.pg0)
2277         self.nat_add_outside_interface(self.pg1)
2278
2279         self.vapi.nat_set_timeouts(
2280             udp=1, tcp_established=7440, tcp_transitory=30, icmp=1)
2281
2282         tcp_port_out = self.init_tcp_session(self.pg0, self.pg1, 2000, 80)
2283         pkts = []
2284         for i in range(0, self.max_sessions - 1):
2285             p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
2286                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
2287                  UDP(sport=7000+i, dport=80))
2288             pkts.append(p)
2289
2290         self.pg0.add_stream(pkts)
2291         self.pg_enable_capture(self.pg_interfaces)
2292         self.pg_start()
2293         self.pg1.get_capture(len(pkts))
2294         self.sleep(1.5, "wait for timeouts")
2295
2296         pkts = []
2297         for i in range(0, self.max_sessions - 1):
2298             p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
2299                  IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
2300                  ICMP(id=8000+i, type='echo-request'))
2301             pkts.append(p)
2302
2303         self.pg0.add_stream(pkts)
2304         self.pg_enable_capture(self.pg_interfaces)
2305         self.pg_start()
2306         self.pg1.get_capture(len(pkts))
2307
2308     def test_session_rst_timeout(self):
2309         """ NAT44ED session RST timeouts """
2310
2311         self.nat_add_address(self.nat_addr)
2312         self.nat_add_inside_interface(self.pg0)
2313         self.nat_add_outside_interface(self.pg1)
2314
2315         self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
2316                                    tcp_transitory=5, icmp=60)
2317
2318         self.init_tcp_session(self.pg0, self.pg1, self.tcp_port_in,
2319                               self.tcp_external_port)
2320         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2321              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2322              TCP(sport=self.tcp_port_in, dport=self.tcp_external_port,
2323                  flags="R"))
2324         self.pg0.add_stream(p)
2325         self.pg_enable_capture(self.pg_interfaces)
2326         self.pg_start()
2327         self.pg1.get_capture(1)
2328
2329         self.sleep(6)
2330
2331         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2332              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2333              TCP(sport=self.tcp_port_in + 1, dport=self.tcp_external_port + 1,
2334                  flags="S"))
2335         self.pg0.add_stream(p)
2336         self.pg_enable_capture(self.pg_interfaces)
2337         self.pg_start()
2338         self.pg1.get_capture(1)
2339
2340     def test_dynamic_out_of_ports(self):
2341         """ NAT44ED dynamic translation test: out of ports """
2342
2343         self.nat_add_inside_interface(self.pg0)
2344         self.nat_add_outside_interface(self.pg1)
2345
2346         # in2out and no NAT addresses added
2347         err_old = self.statistics.get_err_counter(
2348             '/err/nat44-ed-in2out-slowpath/out of ports')
2349
2350         pkts = self.create_stream_in(self.pg0, self.pg1)
2351         self.pg0.add_stream(pkts)
2352         self.pg_enable_capture(self.pg_interfaces)
2353         self.pg_start()
2354         self.pg1.get_capture(0, timeout=1)
2355
2356         err_new = self.statistics.get_err_counter(
2357             '/err/nat44-ed-in2out-slowpath/out of ports')
2358
2359         self.assertEqual(err_new - err_old, len(pkts))
2360
2361         # in2out after NAT addresses added
2362         self.nat_add_address(self.nat_addr)
2363
2364         err_old = self.statistics.get_err_counter(
2365             '/err/nat44-ed-in2out-slowpath/out of ports')
2366
2367         pkts = self.create_stream_in(self.pg0, self.pg1)
2368         self.pg0.add_stream(pkts)
2369         self.pg_enable_capture(self.pg_interfaces)
2370         self.pg_start()
2371         capture = self.pg1.get_capture(len(pkts))
2372         self.verify_capture_out(capture, ignore_port=True)
2373
2374         err_new = self.statistics.get_err_counter(
2375             '/err/nat44-ed-in2out-slowpath/out of ports')
2376
2377         self.assertEqual(err_new, err_old)
2378
2379     def test_unknown_proto(self):
2380         """ NAT44ED translate packet with unknown protocol """
2381
2382         self.nat_add_address(self.nat_addr)
2383         self.nat_add_inside_interface(self.pg0)
2384         self.nat_add_outside_interface(self.pg1)
2385
2386         # in2out
2387         p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
2388              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2389              TCP(sport=self.tcp_port_in, dport=20))
2390         self.pg0.add_stream(p)
2391         self.pg_enable_capture(self.pg_interfaces)
2392         self.pg_start()
2393         p = self.pg1.get_capture(1)
2394
2395         p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
2396              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2397              GRE() /
2398              IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
2399              TCP(sport=1234, dport=1234))
2400         self.pg0.add_stream(p)
2401         self.pg_enable_capture(self.pg_interfaces)
2402         self.pg_start()
2403         p = self.pg1.get_capture(1)
2404         packet = p[0]
2405         try:
2406             self.assertEqual(packet[IP].src, self.nat_addr)
2407             self.assertEqual(packet[IP].dst, self.pg1.remote_ip4)
2408             self.assertEqual(packet.haslayer(GRE), 1)
2409             self.assert_packet_checksums_valid(packet)
2410         except:
2411             self.logger.error(ppp("Unexpected or invalid packet:", packet))
2412             raise
2413
2414         # out2in
2415         p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
2416              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
2417              GRE() /
2418              IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
2419              TCP(sport=1234, dport=1234))
2420         self.pg1.add_stream(p)
2421         self.pg_enable_capture(self.pg_interfaces)
2422         self.pg_start()
2423         p = self.pg0.get_capture(1)
2424         packet = p[0]
2425         try:
2426             self.assertEqual(packet[IP].src, self.pg1.remote_ip4)
2427             self.assertEqual(packet[IP].dst, self.pg0.remote_ip4)
2428             self.assertEqual(packet.haslayer(GRE), 1)
2429             self.assert_packet_checksums_valid(packet)
2430         except:
2431             self.logger.error(ppp("Unexpected or invalid packet:", packet))
2432             raise
2433
2434     def test_hairpinning_unknown_proto(self):
2435         """ NAT44ED translate packet with unknown protocol - hairpinning """
2436         host = self.pg0.remote_hosts[0]
2437         server = self.pg0.remote_hosts[1]
2438         host_in_port = 1234
2439         server_out_port = 8765
2440         server_nat_ip = "10.0.0.11"
2441
2442         self.nat_add_address(self.nat_addr)
2443         self.nat_add_inside_interface(self.pg0)
2444         self.nat_add_outside_interface(self.pg1)
2445
2446         # add static mapping for server
2447         self.nat_add_static_mapping(server.ip4, server_nat_ip)
2448
2449         # host to server
2450         p = (Ether(src=host.mac, dst=self.pg0.local_mac) /
2451              IP(src=host.ip4, dst=server_nat_ip) /
2452              TCP(sport=host_in_port, dport=server_out_port))
2453         self.pg0.add_stream(p)
2454         self.pg_enable_capture(self.pg_interfaces)
2455         self.pg_start()
2456         self.pg0.get_capture(1)
2457
2458         p = (Ether(dst=self.pg0.local_mac, src=host.mac) /
2459              IP(src=host.ip4, dst=server_nat_ip) /
2460              GRE() /
2461              IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
2462              TCP(sport=1234, dport=1234))
2463         self.pg0.add_stream(p)
2464         self.pg_enable_capture(self.pg_interfaces)
2465         self.pg_start()
2466         p = self.pg0.get_capture(1)
2467         packet = p[0]
2468         try:
2469             self.assertEqual(packet[IP].src, self.nat_addr)
2470             self.assertEqual(packet[IP].dst, server.ip4)
2471             self.assertEqual(packet.haslayer(GRE), 1)
2472             self.assert_packet_checksums_valid(packet)
2473         except:
2474             self.logger.error(ppp("Unexpected or invalid packet:", packet))
2475             raise
2476
2477         # server to host
2478         p = (Ether(dst=self.pg0.local_mac, src=server.mac) /
2479              IP(src=server.ip4, dst=self.nat_addr) /
2480              GRE() /
2481              IP(src=self.pg2.remote_ip4, dst=self.pg2.remote_ip4) /
2482              TCP(sport=1234, dport=1234))
2483         self.pg0.add_stream(p)
2484         self.pg_enable_capture(self.pg_interfaces)
2485         self.pg_start()
2486         p = self.pg0.get_capture(1)
2487         packet = p[0]
2488         try:
2489             self.assertEqual(packet[IP].src, server_nat_ip)
2490             self.assertEqual(packet[IP].dst, host.ip4)
2491             self.assertEqual(packet.haslayer(GRE), 1)
2492             self.assert_packet_checksums_valid(packet)
2493         except:
2494             self.logger.error(ppp("Unexpected or invalid packet:", packet))
2495             raise
2496
2497     def test_output_feature_and_service(self):
2498         """ NAT44ED interface output feature and services """
2499         external_addr = '1.2.3.4'
2500         external_port = 80
2501         local_port = 8080
2502
2503         self.vapi.nat44_forwarding_enable_disable(enable=1)
2504         self.nat_add_address(self.nat_addr)
2505         flags = self.config_flags.NAT_IS_ADDR_ONLY
2506         self.vapi.nat44_add_del_identity_mapping(
2507             ip_address=self.pg1.remote_ip4, sw_if_index=0xFFFFFFFF,
2508             flags=flags, is_add=1)
2509         flags = self.config_flags.NAT_IS_OUT2IN_ONLY
2510         self.nat_add_static_mapping(self.pg0.remote_ip4, external_addr,
2511                                     local_port, external_port,
2512                                     proto=IP_PROTOS.tcp, flags=flags)
2513
2514         self.nat_add_inside_interface(self.pg0)
2515         self.nat_add_outside_interface(self.pg0)
2516         self.vapi.nat44_interface_add_del_output_feature(
2517             sw_if_index=self.pg1.sw_if_index, is_add=1)
2518
2519         # from client to service
2520         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2521              IP(src=self.pg1.remote_ip4, dst=external_addr) /
2522              TCP(sport=12345, dport=external_port))
2523         self.pg1.add_stream(p)
2524         self.pg_enable_capture(self.pg_interfaces)
2525         self.pg_start()
2526         capture = self.pg0.get_capture(1)
2527         p = capture[0]
2528         try:
2529             ip = p[IP]
2530             tcp = p[TCP]
2531             self.assertEqual(ip.dst, self.pg0.remote_ip4)
2532             self.assertEqual(tcp.dport, local_port)
2533             self.assert_packet_checksums_valid(p)
2534         except:
2535             self.logger.error(ppp("Unexpected or invalid packet:", p))
2536             raise
2537
2538         # from service back to client
2539         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2540              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2541              TCP(sport=local_port, dport=12345))
2542         self.pg0.add_stream(p)
2543         self.pg_enable_capture(self.pg_interfaces)
2544         self.pg_start()
2545         capture = self.pg1.get_capture(1)
2546         p = capture[0]
2547         try:
2548             ip = p[IP]
2549             tcp = p[TCP]
2550             self.assertEqual(ip.src, external_addr)
2551             self.assertEqual(tcp.sport, external_port)
2552             self.assert_packet_checksums_valid(p)
2553         except:
2554             self.logger.error(ppp("Unexpected or invalid packet:", p))
2555             raise
2556
2557         # from local network host to external network
2558         pkts = self.create_stream_in(self.pg0, self.pg1)
2559         self.pg0.add_stream(pkts)
2560         self.pg_enable_capture(self.pg_interfaces)
2561         self.pg_start()
2562         capture = self.pg1.get_capture(len(pkts))
2563         self.verify_capture_out(capture, ignore_port=True)
2564         pkts = self.create_stream_in(self.pg0, self.pg1)
2565         self.pg0.add_stream(pkts)
2566         self.pg_enable_capture(self.pg_interfaces)
2567         self.pg_start()
2568         capture = self.pg1.get_capture(len(pkts))
2569         self.verify_capture_out(capture, ignore_port=True)
2570
2571         # from external network back to local network host
2572         pkts = self.create_stream_out(self.pg1)
2573         self.pg1.add_stream(pkts)
2574         self.pg_enable_capture(self.pg_interfaces)
2575         self.pg_start()
2576         capture = self.pg0.get_capture(len(pkts))
2577         self.verify_capture_in(capture, self.pg0)
2578
2579     def test_output_feature_and_service3(self):
2580         """ NAT44ED interface output feature and DST NAT """
2581         external_addr = '1.2.3.4'
2582         external_port = 80
2583         local_port = 8080
2584
2585         self.vapi.nat44_forwarding_enable_disable(enable=1)
2586         self.nat_add_address(self.nat_addr)
2587         flags = self.config_flags.NAT_IS_OUT2IN_ONLY
2588         self.nat_add_static_mapping(self.pg1.remote_ip4, external_addr,
2589                                     local_port, external_port,
2590                                     proto=IP_PROTOS.tcp, flags=flags)
2591
2592         self.nat_add_inside_interface(self.pg0)
2593         self.nat_add_outside_interface(self.pg0)
2594         self.vapi.nat44_interface_add_del_output_feature(
2595             sw_if_index=self.pg1.sw_if_index, is_add=1)
2596
2597         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2598              IP(src=self.pg0.remote_ip4, dst=external_addr) /
2599              TCP(sport=12345, dport=external_port))
2600         self.pg0.add_stream(p)
2601         self.pg_enable_capture(self.pg_interfaces)
2602         self.pg_start()
2603         capture = self.pg1.get_capture(1)
2604         p = capture[0]
2605         try:
2606             ip = p[IP]
2607             tcp = p[TCP]
2608             self.assertEqual(ip.src, self.pg0.remote_ip4)
2609             self.assertEqual(tcp.sport, 12345)
2610             self.assertEqual(ip.dst, self.pg1.remote_ip4)
2611             self.assertEqual(tcp.dport, local_port)
2612             self.assert_packet_checksums_valid(p)
2613         except:
2614             self.logger.error(ppp("Unexpected or invalid packet:", p))
2615             raise
2616
2617         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2618              IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
2619              TCP(sport=local_port, dport=12345))
2620         self.pg1.add_stream(p)
2621         self.pg_enable_capture(self.pg_interfaces)
2622         self.pg_start()
2623         capture = self.pg0.get_capture(1)
2624         p = capture[0]
2625         try:
2626             ip = p[IP]
2627             tcp = p[TCP]
2628             self.assertEqual(ip.src, external_addr)
2629             self.assertEqual(tcp.sport, external_port)
2630             self.assertEqual(ip.dst, self.pg0.remote_ip4)
2631             self.assertEqual(tcp.dport, 12345)
2632             self.assert_packet_checksums_valid(p)
2633         except:
2634             self.logger.error(ppp("Unexpected or invalid packet:", p))
2635             raise
2636
2637     def test_self_twice_nat_lb_negative(self):
2638         """ NAT44ED Self Twice NAT local service load balancing (negative test)
2639         """
2640         self.twice_nat_common(lb=True, self_twice_nat=True, same_pg=True,
2641                               client_id=2)
2642
2643     def test_self_twice_nat_negative(self):
2644         """ NAT44ED Self Twice NAT (negative test) """
2645         self.twice_nat_common(self_twice_nat=True)
2646
2647     def test_static_lb_multi_clients(self):
2648         """ NAT44ED local service load balancing - multiple clients"""
2649
2650         external_addr = self.nat_addr
2651         external_port = 80
2652         local_port = 8080
2653         server1 = self.pg0.remote_hosts[0]
2654         server2 = self.pg0.remote_hosts[1]
2655         server3 = self.pg0.remote_hosts[2]
2656
2657         locals = [{'addr': server1.ip4,
2658                    'port': local_port,
2659                    'probability': 90,
2660                    'vrf_id': 0},
2661                   {'addr': server2.ip4,
2662                    'port': local_port,
2663                    'probability': 10,
2664                    'vrf_id': 0}]
2665
2666         flags = self.config_flags.NAT_IS_INSIDE
2667         self.vapi.nat44_interface_add_del_feature(
2668             sw_if_index=self.pg0.sw_if_index,
2669             flags=flags, is_add=1)
2670         self.vapi.nat44_interface_add_del_feature(
2671             sw_if_index=self.pg1.sw_if_index,
2672             is_add=1)
2673
2674         self.nat_add_address(self.nat_addr)
2675         self.vapi.nat44_add_del_lb_static_mapping(is_add=1,
2676                                                   external_addr=external_addr,
2677                                                   external_port=external_port,
2678                                                   protocol=IP_PROTOS.tcp,
2679                                                   local_num=len(locals),
2680                                                   locals=locals)
2681
2682         server1_n = 0
2683         server2_n = 0
2684         clients = ip4_range(self.pg1.remote_ip4, 10, 50)
2685         pkts = []
2686         for client in clients:
2687             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2688                  IP(src=client, dst=self.nat_addr) /
2689                  TCP(sport=12345, dport=external_port))
2690             pkts.append(p)
2691         self.pg1.add_stream(pkts)
2692         self.pg_enable_capture(self.pg_interfaces)
2693         self.pg_start()
2694         capture = self.pg0.get_capture(len(pkts))
2695         for p in capture:
2696             if p[IP].dst == server1.ip4:
2697                 server1_n += 1
2698             else:
2699                 server2_n += 1
2700         self.assertGreater(server1_n, server2_n)
2701
2702         local = {
2703             'addr': server3.ip4,
2704             'port': local_port,
2705             'probability': 20,
2706             'vrf_id': 0
2707         }
2708
2709         # add new back-end
2710         self.vapi.nat44_lb_static_mapping_add_del_local(
2711             is_add=1,
2712             external_addr=external_addr,
2713             external_port=external_port,
2714             local=local,
2715             protocol=IP_PROTOS.tcp)
2716         server1_n = 0
2717         server2_n = 0
2718         server3_n = 0
2719         clients = ip4_range(self.pg1.remote_ip4, 60, 110)
2720         pkts = []
2721         for client in clients:
2722             p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2723                  IP(src=client, dst=self.nat_addr) /
2724                  TCP(sport=12346, dport=external_port))
2725             pkts.append(p)
2726         self.assertGreater(len(pkts), 0)
2727         self.pg1.add_stream(pkts)
2728         self.pg_enable_capture(self.pg_interfaces)
2729         self.pg_start()
2730         capture = self.pg0.get_capture(len(pkts))
2731         for p in capture:
2732             if p[IP].dst == server1.ip4:
2733                 server1_n += 1
2734             elif p[IP].dst == server2.ip4:
2735                 server2_n += 1
2736             else:
2737                 server3_n += 1
2738         self.assertGreater(server1_n, 0)
2739         self.assertGreater(server2_n, 0)
2740         self.assertGreater(server3_n, 0)
2741
2742         local = {
2743             'addr': server2.ip4,
2744             'port': local_port,
2745             'probability': 10,
2746             'vrf_id': 0
2747         }
2748
2749         # remove one back-end
2750         self.vapi.nat44_lb_static_mapping_add_del_local(
2751             is_add=0,
2752             external_addr=external_addr,
2753             external_port=external_port,
2754             local=local,
2755             protocol=IP_PROTOS.tcp)
2756         server1_n = 0
2757         server2_n = 0
2758         server3_n = 0
2759         self.pg1.add_stream(pkts)
2760         self.pg_enable_capture(self.pg_interfaces)
2761         self.pg_start()
2762         capture = self.pg0.get_capture(len(pkts))
2763         for p in capture:
2764             if p[IP].dst == server1.ip4:
2765                 server1_n += 1
2766             elif p[IP].dst == server2.ip4:
2767                 server2_n += 1
2768             else:
2769                 server3_n += 1
2770         self.assertGreater(server1_n, 0)
2771         self.assertEqual(server2_n, 0)
2772         self.assertGreater(server3_n, 0)
2773
2774     def test_syslog_sess(self):
2775         """ NAT44ED Test syslog session creation and deletion """
2776         self.vapi.syslog_set_filter(
2777             self.syslog_severity.SYSLOG_API_SEVERITY_INFO)
2778         self.vapi.syslog_set_sender(self.pg3.local_ip4, self.pg3.remote_ip4)
2779
2780         self.nat_add_address(self.nat_addr)
2781         self.nat_add_inside_interface(self.pg0)
2782         self.nat_add_outside_interface(self.pg1)
2783
2784         p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
2785              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
2786              TCP(sport=self.tcp_port_in, dport=self.tcp_external_port))
2787         self.pg0.add_stream(p)
2788         self.pg_enable_capture(self.pg_interfaces)
2789         self.pg_start()
2790         capture = self.pg1.get_capture(1)
2791         self.tcp_port_out = capture[0][TCP].sport
2792         capture = self.pg3.get_capture(1)
2793         self.verify_syslog_sess(capture[0][Raw].load)
2794
2795         self.pg_enable_capture(self.pg_interfaces)
2796         self.pg_start()
2797         self.nat_add_address(self.nat_addr, is_add=0)
2798         capture = self.pg3.get_capture(1)
2799         self.verify_syslog_sess(capture[0][Raw].load, False)
2800
2801     def test_twice_nat_interface_addr(self):
2802         """ NAT44ED Acquire twice NAT addresses from interface """
2803         flags = self.config_flags.NAT_IS_TWICE_NAT
2804         self.vapi.nat44_add_del_interface_addr(
2805             sw_if_index=self.pg11.sw_if_index,
2806             flags=flags, is_add=1)
2807
2808         # no address in NAT pool
2809         adresses = self.vapi.nat44_address_dump()
2810         self.assertEqual(0, len(adresses))
2811
2812         # configure interface address and check NAT address pool
2813         self.pg11.config_ip4()
2814         adresses = self.vapi.nat44_address_dump()
2815         self.assertEqual(1, len(adresses))
2816         self.assertEqual(str(adresses[0].ip_address),
2817                          self.pg11.local_ip4)
2818         self.assertEqual(adresses[0].flags, flags)
2819
2820         # remove interface address and check NAT address pool
2821         self.pg11.unconfig_ip4()
2822         adresses = self.vapi.nat44_address_dump()
2823         self.assertEqual(0, len(adresses))
2824
2825     def test_output_feature_stateful_acl(self):
2826         """ NAT44ED output feature works with stateful ACL """
2827
2828         self.nat_add_address(self.nat_addr)
2829         self.vapi.nat44_interface_add_del_output_feature(
2830             sw_if_index=self.pg0.sw_if_index,
2831             flags=self.config_flags.NAT_IS_INSIDE, is_add=1)
2832         self.vapi.nat44_interface_add_del_output_feature(
2833             sw_if_index=self.pg1.sw_if_index,
2834             flags=self.config_flags.NAT_IS_OUTSIDE, is_add=1)
2835
2836         # First ensure that the NAT is working sans ACL
2837
2838         # send packets out2in, no sessions yet so packets should drop
2839         pkts_out2in = self.create_stream_out(self.pg1)
2840         self.send_and_assert_no_replies(self.pg1, pkts_out2in)
2841
2842         # send packets into inside intf, ensure received via outside intf
2843         pkts_in2out = self.create_stream_in(self.pg0, self.pg1)
2844         capture = self.send_and_expect(self.pg0, pkts_in2out, self.pg1,
2845                                        len(pkts_in2out))
2846         self.verify_capture_out(capture, ignore_port=True)
2847
2848         # send out2in again, with sessions created it should work now
2849         pkts_out2in = self.create_stream_out(self.pg1)
2850         capture = self.send_and_expect(self.pg1, pkts_out2in, self.pg0,
2851                                        len(pkts_out2in))
2852         self.verify_capture_in(capture, self.pg0)
2853
2854         # Create an ACL blocking everything
2855         out2in_deny_rule = AclRule(is_permit=0)
2856         out2in_acl = VppAcl(self, rules=[out2in_deny_rule])
2857         out2in_acl.add_vpp_config()
2858
2859         # create an ACL to permit/reflect everything
2860         in2out_reflect_rule = AclRule(is_permit=2)
2861         in2out_acl = VppAcl(self, rules=[in2out_reflect_rule])
2862         in2out_acl.add_vpp_config()
2863
2864         # apply as input acl on interface and confirm it blocks everything
2865         acl_if = VppAclInterface(self, sw_if_index=self.pg1.sw_if_index,
2866                                  n_input=1, acls=[out2in_acl])
2867         acl_if.add_vpp_config()
2868         self.send_and_assert_no_replies(self.pg1, pkts_out2in)
2869
2870         # apply output acl
2871         acl_if.acls = [out2in_acl, in2out_acl]
2872         acl_if.add_vpp_config()
2873         # send in2out to generate ACL state (NAT state was created earlier)
2874         capture = self.send_and_expect(self.pg0, pkts_in2out, self.pg1,
2875                                        len(pkts_in2out))
2876         self.verify_capture_out(capture, ignore_port=True)
2877
2878         # send out2in again. ACL state exists so it should work now.
2879         # TCP packets with the syn flag set also need the ack flag
2880         for p in pkts_out2in:
2881             if p.haslayer(TCP) and p[TCP].flags & 0x02:
2882                 p[TCP].flags |= 0x10
2883         capture = self.send_and_expect(self.pg1, pkts_out2in, self.pg0,
2884                                        len(pkts_out2in))
2885         self.verify_capture_in(capture, self.pg0)
2886         self.logger.info(self.vapi.cli("show trace"))
2887
2888     def test_tcp_close(self):
2889         """ NAT44ED Close TCP session from inside network - output feature """
2890         old_timeouts = self.vapi.nat_get_timeouts()
2891         new_transitory = 2
2892         self.vapi.nat_set_timeouts(
2893             udp=old_timeouts.udp,
2894             tcp_established=old_timeouts.tcp_established,
2895             icmp=old_timeouts.icmp,
2896             tcp_transitory=new_transitory)
2897
2898         self.vapi.nat44_forwarding_enable_disable(enable=1)
2899         self.nat_add_address(self.pg1.local_ip4)
2900         twice_nat_addr = '10.0.1.3'
2901         service_ip = '192.168.16.150'
2902         self.nat_add_address(twice_nat_addr, twice_nat=1)
2903
2904         flags = self.config_flags.NAT_IS_INSIDE
2905         self.vapi.nat44_interface_add_del_feature(
2906             sw_if_index=self.pg0.sw_if_index,
2907             is_add=1)
2908         self.vapi.nat44_interface_add_del_feature(
2909             sw_if_index=self.pg0.sw_if_index,
2910             flags=flags, is_add=1)
2911         self.vapi.nat44_interface_add_del_output_feature(
2912             is_add=1,
2913             sw_if_index=self.pg1.sw_if_index)
2914
2915         flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
2916                  self.config_flags.NAT_IS_TWICE_NAT)
2917         self.nat_add_static_mapping(self.pg0.remote_ip4,
2918                                     service_ip, 80, 80,
2919                                     proto=IP_PROTOS.tcp,
2920                                     flags=flags)
2921         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
2922         start_sessnum = len(sessions)
2923
2924         # SYN packet out->in
2925         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2926              IP(src=self.pg1.remote_ip4, dst=service_ip) /
2927              TCP(sport=33898, dport=80, flags="S"))
2928         self.pg1.add_stream(p)
2929         self.pg_enable_capture(self.pg_interfaces)
2930         self.pg_start()
2931         capture = self.pg0.get_capture(1)
2932         p = capture[0]
2933         tcp_port = p[TCP].sport
2934
2935         # SYN + ACK packet in->out
2936         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2937              IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
2938              TCP(sport=80, dport=tcp_port, flags="SA"))
2939         self.pg0.add_stream(p)
2940         self.pg_enable_capture(self.pg_interfaces)
2941         self.pg_start()
2942         self.pg1.get_capture(1)
2943
2944         # ACK packet out->in
2945         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2946              IP(src=self.pg1.remote_ip4, dst=service_ip) /
2947              TCP(sport=33898, dport=80, flags="A"))
2948         self.pg1.add_stream(p)
2949         self.pg_enable_capture(self.pg_interfaces)
2950         self.pg_start()
2951         self.pg0.get_capture(1)
2952
2953         # FIN packet in -> out
2954         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2955              IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
2956              TCP(sport=80, dport=tcp_port, flags="FA", seq=100, ack=300))
2957         self.pg0.add_stream(p)
2958         self.pg_enable_capture(self.pg_interfaces)
2959         self.pg_start()
2960         self.pg1.get_capture(1)
2961
2962         # FIN+ACK packet out -> in
2963         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2964              IP(src=self.pg1.remote_ip4, dst=service_ip) /
2965              TCP(sport=33898, dport=80, flags="FA", seq=300, ack=101))
2966         self.pg1.add_stream(p)
2967         self.pg_enable_capture(self.pg_interfaces)
2968         self.pg_start()
2969         self.pg0.get_capture(1)
2970
2971         # ACK packet in -> out
2972         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
2973              IP(src=self.pg0.remote_ip4, dst=twice_nat_addr) /
2974              TCP(sport=80, dport=tcp_port, flags="A", seq=101, ack=301))
2975         self.pg0.add_stream(p)
2976         self.pg_enable_capture(self.pg_interfaces)
2977         self.pg_start()
2978         self.pg1.get_capture(1)
2979
2980         # session now in transitory timeout
2981         # try SYN packet out->in - should be dropped
2982         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2983              IP(src=self.pg1.remote_ip4, dst=service_ip) /
2984              TCP(sport=33898, dport=80, flags="S"))
2985         self.pg1.add_stream(p)
2986         self.pg_enable_capture(self.pg_interfaces)
2987         self.pg_start()
2988
2989         self.sleep(new_transitory, "wait for transitory timeout")
2990         self.pg0.assert_nothing_captured(0)
2991
2992         # session should still exist
2993         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
2994         self.assertEqual(len(sessions) - start_sessnum, 1)
2995
2996         # send FIN+ACK packet out -> in - will cause session to be wiped
2997         # but won't create a new session
2998         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
2999              IP(src=self.pg1.remote_ip4, dst=service_ip) /
3000              TCP(sport=33898, dport=80, flags="FA", seq=300, ack=101))
3001         self.pg1.add_stream(p)
3002         self.pg_enable_capture(self.pg_interfaces)
3003         self.pg_start()
3004
3005         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3006         self.assertEqual(len(sessions) - start_sessnum, 0)
3007         self.pg0.assert_nothing_captured(0)
3008
3009     def test_tcp_session_close_in(self):
3010         """ NAT44ED Close TCP session from inside network """
3011
3012         in_port = self.tcp_port_in
3013         out_port = 10505
3014         ext_port = self.tcp_external_port
3015
3016         self.nat_add_address(self.nat_addr)
3017         self.nat_add_inside_interface(self.pg0)
3018         self.nat_add_outside_interface(self.pg1)
3019         self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
3020                                     in_port, out_port, proto=IP_PROTOS.tcp,
3021                                     flags=self.config_flags.NAT_IS_TWICE_NAT)
3022
3023         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3024         session_n = len(sessions)
3025
3026         self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
3027                                    tcp_transitory=2, icmp=5)
3028
3029         self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
3030
3031         # FIN packet in -> out
3032         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3033              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3034              TCP(sport=in_port, dport=ext_port,
3035                  flags="FA", seq=100, ack=300))
3036         self.pg0.add_stream(p)
3037         self.pg_enable_capture(self.pg_interfaces)
3038         self.pg_start()
3039         self.pg1.get_capture(1)
3040
3041         pkts = []
3042
3043         # ACK packet out -> in
3044         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3045              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3046              TCP(sport=ext_port, dport=out_port,
3047                  flags="A", seq=300, ack=101))
3048         pkts.append(p)
3049
3050         # FIN packet out -> in
3051         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3052              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3053              TCP(sport=ext_port, dport=out_port,
3054                  flags="FA", seq=300, ack=101))
3055         pkts.append(p)
3056
3057         self.pg1.add_stream(pkts)
3058         self.pg_enable_capture(self.pg_interfaces)
3059         self.pg_start()
3060         self.pg0.get_capture(2)
3061
3062         # ACK packet in -> out
3063         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3064              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3065              TCP(sport=in_port, dport=ext_port,
3066                  flags="A", seq=101, ack=301))
3067         self.pg0.add_stream(p)
3068         self.pg_enable_capture(self.pg_interfaces)
3069         self.pg_start()
3070         self.pg1.get_capture(1)
3071
3072         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3073         self.assertEqual(len(sessions) - session_n, 1)
3074
3075         out2in_drops = self.get_err_counter(
3076             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3077         in2out_drops = self.get_err_counter(
3078             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3079
3080         # extra FIN packet out -> in - this should be dropped
3081         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3082              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3083              TCP(sport=ext_port, dport=out_port,
3084                  flags="FA", seq=300, ack=101))
3085
3086         self.pg1.add_stream(p)
3087         self.pg_enable_capture(self.pg_interfaces)
3088         self.pg_start()
3089         self.pg0.assert_nothing_captured()
3090
3091         # extra ACK packet in -> out - this should be dropped
3092         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3093              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3094              TCP(sport=in_port, dport=ext_port,
3095                  flags="A", seq=101, ack=301))
3096         self.pg0.add_stream(p)
3097         self.pg_enable_capture(self.pg_interfaces)
3098         self.pg_start()
3099         self.pg1.assert_nothing_captured()
3100
3101         stats = self.get_err_counter(
3102             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3103         self.assertEqual(stats - out2in_drops, 1)
3104         stats = self.get_err_counter(
3105             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3106         self.assertEqual(stats - in2out_drops, 1)
3107
3108         self.sleep(3)
3109         # extra ACK packet in -> out - this will cause session to be wiped
3110         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3111              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3112              TCP(sport=in_port, dport=ext_port,
3113                  flags="A", seq=101, ack=301))
3114         self.pg0.add_stream(p)
3115         self.pg_enable_capture(self.pg_interfaces)
3116         self.pg_start()
3117         self.pg1.assert_nothing_captured()
3118         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3119         self.assertEqual(len(sessions) - session_n, 0)
3120
3121     def test_tcp_session_close_out(self):
3122         """ NAT44ED Close TCP session from outside network """
3123
3124         in_port = self.tcp_port_in
3125         out_port = 10505
3126         ext_port = self.tcp_external_port
3127
3128         self.nat_add_address(self.nat_addr)
3129         self.nat_add_inside_interface(self.pg0)
3130         self.nat_add_outside_interface(self.pg1)
3131         self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
3132                                     in_port, out_port, proto=IP_PROTOS.tcp,
3133                                     flags=self.config_flags.NAT_IS_TWICE_NAT)
3134
3135         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3136         session_n = len(sessions)
3137
3138         self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
3139                                    tcp_transitory=2, icmp=5)
3140
3141         _ = self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
3142
3143         # FIN packet out -> in
3144         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3145              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3146              TCP(sport=ext_port, dport=out_port,
3147                  flags="FA", seq=100, ack=300))
3148         self.pg1.add_stream(p)
3149         self.pg_enable_capture(self.pg_interfaces)
3150         self.pg_start()
3151         self.pg0.get_capture(1)
3152
3153         # FIN+ACK packet in -> out
3154         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3155              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3156              TCP(sport=in_port, dport=ext_port,
3157                  flags="FA", seq=300, ack=101))
3158
3159         self.pg0.add_stream(p)
3160         self.pg_enable_capture(self.pg_interfaces)
3161         self.pg_start()
3162         self.pg1.get_capture(1)
3163
3164         # ACK packet out -> in
3165         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3166              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3167              TCP(sport=ext_port, dport=out_port,
3168                  flags="A", seq=101, ack=301))
3169         self.pg1.add_stream(p)
3170         self.pg_enable_capture(self.pg_interfaces)
3171         self.pg_start()
3172         self.pg0.get_capture(1)
3173
3174         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3175         self.assertEqual(len(sessions) - session_n, 1)
3176
3177         out2in_drops = self.get_err_counter(
3178             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3179         in2out_drops = self.get_err_counter(
3180             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3181
3182         # extra FIN packet out -> in - this should be dropped
3183         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3184              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3185              TCP(sport=ext_port, dport=out_port,
3186                  flags="FA", seq=300, ack=101))
3187
3188         self.pg1.add_stream(p)
3189         self.pg_enable_capture(self.pg_interfaces)
3190         self.pg_start()
3191         self.pg0.assert_nothing_captured()
3192
3193         # extra ACK packet in -> out - this should be dropped
3194         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3195              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3196              TCP(sport=in_port, dport=ext_port,
3197                  flags="A", seq=101, ack=301))
3198         self.pg0.add_stream(p)
3199         self.pg_enable_capture(self.pg_interfaces)
3200         self.pg_start()
3201         self.pg1.assert_nothing_captured()
3202
3203         stats = self.get_err_counter(
3204             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3205         self.assertEqual(stats - out2in_drops, 1)
3206         stats = self.get_err_counter(
3207             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3208         self.assertEqual(stats - in2out_drops, 1)
3209
3210         self.sleep(3)
3211         # extra ACK packet in -> out - this will cause session to be wiped
3212         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3213              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3214              TCP(sport=in_port, dport=ext_port,
3215                  flags="A", seq=101, ack=301))
3216         self.pg0.add_stream(p)
3217         self.pg_enable_capture(self.pg_interfaces)
3218         self.pg_start()
3219         self.pg1.assert_nothing_captured()
3220         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3221         self.assertEqual(len(sessions) - session_n, 0)
3222
3223     def test_tcp_session_close_simultaneous(self):
3224         """ NAT44ED Close TCP session from inside network """
3225
3226         in_port = self.tcp_port_in
3227         ext_port = 10505
3228
3229         self.nat_add_address(self.nat_addr)
3230         self.nat_add_inside_interface(self.pg0)
3231         self.nat_add_outside_interface(self.pg1)
3232         self.nat_add_static_mapping(self.pg0.remote_ip4, self.nat_addr,
3233                                     in_port, ext_port, proto=IP_PROTOS.tcp,
3234                                     flags=self.config_flags.NAT_IS_TWICE_NAT)
3235
3236         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3237         session_n = len(sessions)
3238
3239         self.vapi.nat_set_timeouts(udp=300, tcp_established=7440,
3240                                    tcp_transitory=2, icmp=5)
3241
3242         out_port = self.init_tcp_session(self.pg0, self.pg1, in_port, ext_port)
3243
3244         # FIN packet in -> out
3245         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3246              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3247              TCP(sport=in_port, dport=ext_port,
3248                  flags="FA", seq=100, ack=300))
3249         self.pg0.add_stream(p)
3250         self.pg_enable_capture(self.pg_interfaces)
3251         self.pg_start()
3252         self.pg1.get_capture(1)
3253
3254         # FIN packet out -> in
3255         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3256              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3257              TCP(sport=ext_port, dport=out_port,
3258                  flags="FA", seq=300, ack=100))
3259         self.pg1.add_stream(p)
3260         self.pg_enable_capture(self.pg_interfaces)
3261         self.pg_start()
3262         self.pg0.get_capture(1)
3263
3264         # ACK packet in -> out
3265         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3266              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3267              TCP(sport=in_port, dport=ext_port,
3268                  flags="A", seq=101, ack=301))
3269         self.pg0.add_stream(p)
3270         self.pg_enable_capture(self.pg_interfaces)
3271         self.pg_start()
3272         self.pg1.get_capture(1)
3273
3274         # ACK packet out -> in
3275         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3276              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3277              TCP(sport=ext_port, dport=out_port,
3278                  flags="A", seq=301, ack=101))
3279         self.pg1.add_stream(p)
3280         self.pg_enable_capture(self.pg_interfaces)
3281         self.pg_start()
3282         self.pg0.get_capture(1)
3283
3284         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3285         self.assertEqual(len(sessions) - session_n, 1)
3286
3287         out2in_drops = self.get_err_counter(
3288             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3289         in2out_drops = self.get_err_counter(
3290             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3291
3292         # extra FIN packet out -> in - this should be dropped
3293         p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
3294              IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
3295              TCP(sport=ext_port, dport=out_port,
3296                  flags="FA", seq=300, ack=101))
3297
3298         self.pg1.add_stream(p)
3299         self.pg_enable_capture(self.pg_interfaces)
3300         self.pg_start()
3301         self.pg0.assert_nothing_captured()
3302
3303         # extra ACK packet in -> out - this should be dropped
3304         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3305              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3306              TCP(sport=in_port, dport=ext_port,
3307                  flags="A", seq=101, ack=301))
3308         self.pg0.add_stream(p)
3309         self.pg_enable_capture(self.pg_interfaces)
3310         self.pg_start()
3311         self.pg1.assert_nothing_captured()
3312
3313         stats = self.get_err_counter(
3314             '/err/nat44-ed-out2in/drops due to TCP in transitory timeout')
3315         self.assertEqual(stats - out2in_drops, 1)
3316         stats = self.get_err_counter(
3317             '/err/nat44-ed-in2out/drops due to TCP in transitory timeout')
3318         self.assertEqual(stats - in2out_drops, 1)
3319
3320         self.sleep(3)
3321         # extra ACK packet in -> out - this will cause session to be wiped
3322         p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
3323              IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
3324              TCP(sport=in_port, dport=ext_port,
3325                  flags="A", seq=101, ack=301))
3326         self.pg0.add_stream(p)
3327         self.pg_enable_capture(self.pg_interfaces)
3328         self.pg_start()
3329         self.pg1.assert_nothing_captured()
3330         sessions = self.vapi.nat44_user_session_dump(self.pg0.remote_ip4, 0)
3331         self.assertEqual(len(sessions) - session_n, 0)
3332
3333     def test_dynamic_vrf(self):
3334         """ NAT44ED dynamic translation test: different VRF"""
3335
3336         vrf_id_in = 33
3337         vrf_id_out = 34
3338
3339         self.nat_add_address(self.nat_addr, vrf_id=vrf_id_in)
3340
3341         try:
3342             self.configure_ip4_interface(self.pg7, table_id=vrf_id_in)
3343             self.configure_ip4_interface(self.pg8, table_id=vrf_id_out)
3344
3345             self.nat_add_inside_interface(self.pg7)
3346             self.nat_add_outside_interface(self.pg8)
3347
3348             # just basic stuff nothing special
3349             pkts = self.create_stream_in(self.pg7, self.pg8)
3350             self.pg7.add_stream(pkts)
3351             self.pg_enable_capture(self.pg_interfaces)
3352             self.pg_start()
3353             capture = self.pg8.get_capture(len(pkts))
3354             self.verify_capture_out(capture, ignore_port=True)
3355
3356             pkts = self.create_stream_out(self.pg8)
3357             self.pg8.add_stream(pkts)
3358             self.pg_enable_capture(self.pg_interfaces)
3359             self.pg_start()
3360             capture = self.pg7.get_capture(len(pkts))
3361             self.verify_capture_in(capture, self.pg7)
3362
3363         finally:
3364             self.pg7.unconfig()
3365             self.pg8.unconfig()
3366
3367             self.vapi.ip_table_add_del(is_add=0,
3368                                        table={'table_id': vrf_id_in})
3369             self.vapi.ip_table_add_del(is_add=0,
3370                                        table={'table_id': vrf_id_out})
3371
3372     def test_dynamic_output_feature_vrf(self):
3373         """ NAT44ED dynamic translation test: output-feature, VRF"""
3374
3375         # other then default (0)
3376         new_vrf_id = 22
3377
3378         self.nat_add_address(self.nat_addr)
3379         flags = self.config_flags.NAT_IS_INSIDE
3380         self.vapi.nat44_interface_add_del_output_feature(
3381             sw_if_index=self.pg7.sw_if_index,
3382             flags=flags, is_add=1)
3383         self.vapi.nat44_interface_add_del_output_feature(
3384             sw_if_index=self.pg8.sw_if_index,
3385             is_add=1)
3386
3387         try:
3388             self.configure_ip4_interface(self.pg7, table_id=new_vrf_id)
3389             self.configure_ip4_interface(self.pg8, table_id=new_vrf_id)
3390
3391             # in2out
3392             tcpn = self.statistics['/nat44-ed/in2out/slowpath/tcp']
3393             udpn = self.statistics['/nat44-ed/in2out/slowpath/udp']
3394             icmpn = self.statistics['/nat44-ed/in2out/slowpath/icmp']
3395             drops = self.statistics['/nat44-ed/in2out/slowpath/drops']
3396
3397             pkts = self.create_stream_in(self.pg7, self.pg8)
3398             self.pg7.add_stream(pkts)
3399             self.pg_enable_capture(self.pg_interfaces)
3400             self.pg_start()
3401             capture = self.pg8.get_capture(len(pkts))
3402             self.verify_capture_out(capture, ignore_port=True)
3403
3404             if_idx = self.pg7.sw_if_index
3405             cnt = self.statistics['/nat44-ed/in2out/slowpath/tcp']
3406             self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
3407             cnt = self.statistics['/nat44-ed/in2out/slowpath/udp']
3408             self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
3409             cnt = self.statistics['/nat44-ed/in2out/slowpath/icmp']
3410             self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
3411             cnt = self.statistics['/nat44-ed/in2out/slowpath/drops']
3412             self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
3413
3414             # out2in
3415             tcpn = self.statistics['/nat44-ed/out2in/fastpath/tcp']
3416             udpn = self.statistics['/nat44-ed/out2in/fastpath/udp']
3417             icmpn = self.statistics['/nat44-ed/out2in/fastpath/icmp']
3418             drops = self.statistics['/nat44-ed/out2in/fastpath/drops']
3419
3420             pkts = self.create_stream_out(self.pg8)
3421             self.pg8.add_stream(pkts)
3422             self.pg_enable_capture(self.pg_interfaces)
3423             self.pg_start()
3424             capture = self.pg7.get_capture(len(pkts))
3425             self.verify_capture_in(capture, self.pg7)
3426
3427             if_idx = self.pg8.sw_if_index
3428             cnt = self.statistics['/nat44-ed/out2in/fastpath/tcp']
3429             self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
3430             cnt = self.statistics['/nat44-ed/out2in/fastpath/udp']
3431             self.assertEqual(cnt[:, if_idx].sum() - udpn[:, if_idx].sum(), 1)
3432             cnt = self.statistics['/nat44-ed/out2in/fastpath/icmp']
3433             self.assertEqual(cnt[:, if_idx].sum() - icmpn[:, if_idx].sum(), 1)
3434             cnt = self.statistics['/nat44-ed/out2in/fastpath/drops']
3435             self.assertEqual(cnt[:, if_idx].sum() - drops[:, if_idx].sum(), 0)
3436
3437             sessions = self.statistics['/nat44-ed/total-sessions']
3438             self.assertEqual(sessions[:, 0].sum(), 3)
3439
3440         finally:
3441             self.pg7.unconfig()
3442             self.pg8.unconfig()
3443
3444             self.vapi.ip_table_add_del(is_add=0,
3445                                        table={'table_id': new_vrf_id})
3446
3447     def test_next_src_nat(self):
3448         """ NAT44ED On way back forward packet to nat44-in2out node. """
3449
3450         twice_nat_addr = '10.0.1.3'
3451         external_port = 80
3452         local_port = 8080
3453         post_twice_nat_port = 0
3454
3455         self.vapi.nat44_forwarding_enable_disable(enable=1)
3456         self.nat_add_address(twice_nat_addr, twice_nat=1)
3457         flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
3458                  self.config_flags.NAT_IS_SELF_TWICE_NAT)
3459         self.nat_add_static_mapping(self.pg6.remote_ip4, self.pg1.remote_ip4,
3460                                     local_port, external_port,
3461                                     proto=IP_PROTOS.tcp, vrf_id=1,
3462                                     flags=flags)
3463         self.vapi.nat44_interface_add_del_feature(
3464             sw_if_index=self.pg6.sw_if_index,
3465             is_add=1)
3466
3467         p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
3468              IP(src=self.pg6.remote_ip4, dst=self.pg1.remote_ip4) /
3469              TCP(sport=12345, dport=external_port))
3470         self.pg6.add_stream(p)
3471         self.pg_enable_capture(self.pg_interfaces)
3472         self.pg_start()
3473         capture = self.pg6.get_capture(1)
3474         p = capture[0]
3475         try:
3476             ip = p[IP]
3477             tcp = p[TCP]
3478             self.assertEqual(ip.src, twice_nat_addr)
3479             self.assertNotEqual(tcp.sport, 12345)
3480             post_twice_nat_port = tcp.sport
3481             self.assertEqual(ip.dst, self.pg6.remote_ip4)
3482             self.assertEqual(tcp.dport, local_port)
3483             self.assert_packet_checksums_valid(p)
3484         except:
3485             self.logger.error(ppp("Unexpected or invalid packet:", p))
3486             raise
3487
3488         p = (Ether(src=self.pg6.remote_mac, dst=self.pg6.local_mac) /
3489              IP(src=self.pg6.remote_ip4, dst=twice_nat_addr) /
3490              TCP(sport=local_port, dport=post_twice_nat_port))
3491         self.pg6.add_stream(p)
3492         self.pg_enable_capture(self.pg_interfaces)
3493         self.pg_start()
3494         capture = self.pg6.get_capture(1)
3495         p = capture[0]
3496         try:
3497             ip = p[IP]
3498             tcp = p[TCP]
3499             self.assertEqual(ip.src, self.pg1.remote_ip4)
3500             self.assertEqual(tcp.sport, external_port)
3501             self.assertEqual(ip.dst, self.pg6.remote_ip4)
3502             self.assertEqual(tcp.dport, 12345)
3503             self.assert_packet_checksums_valid(p)
3504         except:
3505             self.logger.error(ppp("Unexpected or invalid packet:", p))
3506             raise
3507
3508     def test_one_armed_nat44_static(self):
3509         """ NAT44ED One armed NAT and 1:1 NAPT asymmetrical rule """
3510
3511         remote_host = self.pg4.remote_hosts[0]
3512         local_host = self.pg4.remote_hosts[1]
3513         external_port = 80
3514         local_port = 8080
3515         eh_port_in = 0
3516
3517         self.vapi.nat44_forwarding_enable_disable(enable=1)
3518         self.nat_add_address(self.nat_addr, twice_nat=1)
3519         flags = (self.config_flags.NAT_IS_OUT2IN_ONLY |
3520                  self.config_flags.NAT_IS_TWICE_NAT)
3521         self.nat_add_static_mapping(local_host.ip4, self.nat_addr,
3522                                     local_port, external_port,
3523                                     proto=IP_PROTOS.tcp, flags=flags)
3524         flags = self.config_flags.NAT_IS_INSIDE
3525         self.vapi.nat44_interface_add_del_feature(
3526             sw_if_index=self.pg4.sw_if_index,
3527             is_add=1)
3528         self.vapi.nat44_interface_add_del_feature(
3529             sw_if_index=self.pg4.sw_if_index,
3530             flags=flags, is_add=1)
3531
3532         # from client to service
3533         p = (Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac) /
3534              IP(src=remote_host.ip4, dst=self.nat_addr) /
3535              TCP(sport=12345, dport=external_port))
3536         self.pg4.add_stream(p)
3537         self.pg_enable_capture(self.pg_interfaces)
3538         self.pg_start()
3539         capture = self.pg4.get_capture(1)
3540         p = capture[0]
3541         try:
3542             ip = p[IP]
3543             tcp = p[TCP]
3544             self.assertEqual(ip.dst, local_host.ip4)
3545             self.assertEqual(ip.src, self.nat_addr)
3546             self.assertEqual(tcp.dport, local_port)
3547             self.assertNotEqual(tcp.sport, 12345)
3548             eh_port_in = tcp.sport
3549             self.assert_packet_checksums_valid(p)
3550         except:
3551             self.logger.error(ppp("Unexpected or invalid packet:", p))
3552             raise
3553
3554         # from service back to client
3555         p = (Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac) /
3556              IP(src=local_host.ip4, dst=self.nat_addr) /
3557              TCP(sport=local_port, dport=eh_port_in))
3558         self.pg4.add_stream(p)
3559         self.pg_enable_capture(self.pg_interfaces)
3560         self.pg_start()
3561         capture = self.pg4.get_capture(1)
3562         p = capture[0]
3563         try:
3564             ip = p[IP]
3565             tcp = p[TCP]
3566             self.assertEqual(ip.src, self.nat_addr)
3567             self.assertEqual(ip.dst, remote_host.ip4)
3568             self.assertEqual(tcp.sport, external_port)
3569             self.assertEqual(tcp.dport, 12345)
3570             self.assert_packet_checksums_valid(p)
3571         except:
3572             self.logger.error(ppp("Unexpected or invalid packet:", p))
3573             raise
3574
3575
3576 if __name__ == '__main__':
3577     unittest.main(testRunner=VppTestRunner)