test/test_reassembly.py

   1 #!/usr/bin/env python
   2
   3 import six
   4 import unittest
   5 from random import shuffle
   6
   7 from framework import VppTestCase, VppTestRunner, is_skip_aarch64_set,\
   8     is_platform_aarch64
   9
  10 from scapy.packet import Raw
  11 from scapy.layers.l2 import Ether, GRE
  12 from scapy.layers.inet import IP, UDP, ICMP
  13 from util import ppp, fragment_rfc791, fragment_rfc8200
  14 from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, ICMPv6ParamProblem,\
  15     ICMPv6TimeExceeded
  16 from vpp_gre_interface import VppGreInterface, VppGre6Interface
  17 from vpp_ip import DpoProto
  18 from vpp_ip_route import VppIpRoute, VppRoutePath
  19
  20 # 35 is enough to have >257 400-byte fragments
  21 test_packet_count = 35
  22
  23
  24 class TestIPv4Reassembly(VppTestCase):
  25     """ IPv4 Reassembly """
  26
  27     @classmethod
  28     def setUpClass(cls):
  29         super(TestIPv4Reassembly, cls).setUpClass()
  30
  31         cls.create_pg_interfaces([0, 1])
  32         cls.src_if = cls.pg0
  33         cls.dst_if = cls.pg1
  34
  35         # setup all interfaces
  36         for i in cls.pg_interfaces:
  37             i.admin_up()
  38             i.config_ip4()
  39             i.resolve_arp()
  40
  41         # packet sizes
  42         cls.packet_sizes = [64, 512, 1518, 9018]
  43         cls.padding = " abcdefghijklmn"
  44         cls.create_stream(cls.packet_sizes)
  45         cls.create_fragments()
  46
  47     def setUp(self):
  48         """ Test setup - force timeout on existing reassemblies """
  49         super(TestIPv4Reassembly, self).setUp()
  50         self.vapi.ip_reassembly_enable_disable(
  51             sw_if_index=self.src_if.sw_if_index, enable_ip4=True)
  52         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
  53                                     expire_walk_interval_ms=10)
  54         self.sleep(.25)
  55         self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
  56                                     expire_walk_interval_ms=10000)
  57
  58     def tearDown(self):
  59         super(TestIPv4Reassembly, self).tearDown()
  60         self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
  61
  62     @classmethod
  63     def create_stream(cls, packet_sizes, packet_count=test_packet_count):
  64         """Create input packet stream
  65
  66         :param list packet_sizes: Required packet sizes.
  67         """
  68         for i in range(0, packet_count):
  69             info = cls.create_packet_info(cls.src_if, cls.src_if)
  70             payload = cls.info_to_payload(info)
  71             p = (Ether(dst=cls.src_if.local_mac, src=cls.src_if.remote_mac) /
  72                  IP(id=info.index, src=cls.src_if.remote_ip4,
  73                     dst=cls.dst_if.remote_ip4) /
  74                  UDP(sport=1234, dport=5678) /
  75                  Raw(payload))
  76             size = packet_sizes[(i // 2) % len(packet_sizes)]
  77             cls.extend_packet(p, size, cls.padding)
  78             info.data = p
  79
  80     @classmethod
  81     def create_fragments(cls):
  82         infos = cls._packet_infos
  83         cls.pkt_infos = []
  84         for index, info in six.iteritems(infos):
  85             p = info.data
  86             # cls.logger.debug(ppp("Packet:", p.__class__(str(p))))
  87             fragments_400 = fragment_rfc791(p, 400)
  88             fragments_300 = fragment_rfc791(p, 300)
  89             fragments_200 = [
  90                 x for f in fragments_400 for x in fragment_rfc791(f, 200)]
  91             cls.pkt_infos.append(
  92                 (index, fragments_400, fragments_300, fragments_200))
  93         cls.fragments_400 = [
  94             x for (_, frags, _, _) in cls.pkt_infos for x in frags]
  95         cls.fragments_300 = [
  96             x for (_, _, frags, _) in cls.pkt_infos for x in frags]
  97         cls.fragments_200 = [
  98             x for (_, _, _, frags) in cls.pkt_infos for x in frags]
  99         cls.logger.debug("Fragmented %s packets into %s 400-byte fragments, "
 100                          "%s 300-byte fragments and %s 200-byte fragments" %
 101                          (len(infos), len(cls.fragments_400),
 102                              len(cls.fragments_300), len(cls.fragments_200)))
 103
 104     def verify_capture(self, capture, dropped_packet_indexes=[]):
 105         """Verify captured packet stream.
 106
 107         :param list capture: Captured packet stream.
 108         """
 109         info = None
 110         seen = set()
 111         for packet in capture:
 112             try:
 113                 self.logger.debug(ppp("Got packet:", packet))
 114                 ip = packet[IP]
 115                 udp = packet[UDP]
 116                 payload_info = self.payload_to_info(str(packet[Raw]))
 117                 packet_index = payload_info.index
 118                 self.assertTrue(
 119                     packet_index not in dropped_packet_indexes,
 120                     ppp("Packet received, but should be dropped:", packet))
 121                 if packet_index in seen:
 122                     raise Exception(ppp("Duplicate packet received", packet))
 123                 seen.add(packet_index)
 124                 self.assertEqual(payload_info.dst, self.src_if.sw_if_index)
 125                 info = self._packet_infos[packet_index]
 126                 self.assertTrue(info is not None)
 127                 self.assertEqual(packet_index, info.index)
 128                 saved_packet = info.data
 129                 self.assertEqual(ip.src, saved_packet[IP].src)
 130                 self.assertEqual(ip.dst, saved_packet[IP].dst)
 131                 self.assertEqual(udp.payload, saved_packet[UDP].payload)
 132             except Exception:
 133                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
 134                 raise
 135         for index in self._packet_infos:
 136             self.assertTrue(index in seen or index in dropped_packet_indexes,
 137                             "Packet with packet_index %d not received" % index)
 138
 139     def test_reassembly(self):
 140         """ basic reassembly """
 141
 142         self.pg_enable_capture()
 143         self.src_if.add_stream(self.fragments_200)
 144         self.pg_start()
 145
 146         packets = self.dst_if.get_capture(len(self.pkt_infos))
 147         self.verify_capture(packets)
 148         self.src_if.assert_nothing_captured()
 149
 150         # run it all again to verify correctness
 151         self.pg_enable_capture()
 152         self.src_if.add_stream(self.fragments_200)
 153         self.pg_start()
 154
 155         packets = self.dst_if.get_capture(len(self.pkt_infos))
 156         self.verify_capture(packets)
 157         self.src_if.assert_nothing_captured()
 158
 159     def test_reversed(self):
 160         """ reverse order reassembly """
 161
 162         fragments = list(self.fragments_200)
 163         fragments.reverse()
 164
 165         self.pg_enable_capture()
 166         self.src_if.add_stream(fragments)
 167         self.pg_start()
 168
 169         packets = self.dst_if.get_capture(len(self.packet_infos))
 170         self.verify_capture(packets)
 171         self.src_if.assert_nothing_captured()
 172
 173         # run it all again to verify correctness
 174         self.pg_enable_capture()
 175         self.src_if.add_stream(fragments)
 176         self.pg_start()
 177
 178         packets = self.dst_if.get_capture(len(self.packet_infos))
 179         self.verify_capture(packets)
 180         self.src_if.assert_nothing_captured()
 181
 182     def test_5737(self):
 183         """ fragment length + ip header size > 65535 """
 184         self.vapi.cli("clear errors")
 185         raw = ('E\x00\x00\x88,\xf8\x1f\xfe@\x01\x98\x00\xc0\xa8\n-\xc0\xa8\n'
 186                '\x01\x08\x00\xf0J\xed\xcb\xf1\xf5Test-group: IPv4.IPv4.ipv4-'
 187                'message.Ethernet-Payload.IPv4-Packet.IPv4-Header.Fragment-Of'
 188                'fset; Test-case: 5737')
 189
 190         malformed_packet = (Ether(dst=self.src_if.local_mac,
 191                                   src=self.src_if.remote_mac) /
 192                             IP(raw))
 193         p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
 194              IP(id=1000, src=self.src_if.remote_ip4,
 195                 dst=self.dst_if.remote_ip4) /
 196              UDP(sport=1234, dport=5678) /
 197              Raw("X" * 1000))
 198         valid_fragments = fragment_rfc791(p, 400)
 199
 200         self.pg_enable_capture()
 201         self.src_if.add_stream([malformed_packet] + valid_fragments)
 202         self.pg_start()
 203
 204         self.dst_if.get_capture(1)
 205         self.assert_packet_counter_equal("ip4-reassembly-feature", 1)
 206         # TODO remove above, uncomment below once clearing of counters
 207         # is supported
 208         # self.assert_packet_counter_equal(
 209         #     "/err/ip4-reassembly-feature/malformed packets", 1)
 210
 211     def test_44924(self):
 212         """ compress tiny fragments """
 213         packets = [(Ether(dst=self.src_if.local_mac,
 214                           src=self.src_if.remote_mac) /
 215                     IP(id=24339, flags="MF", frag=0, ttl=64,
 216                        src=self.src_if.remote_ip4,
 217                        dst=self.dst_if.remote_ip4) /
 218                     ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) /
 219                     Raw(load='Test-group: IPv4')),
 220                    (Ether(dst=self.src_if.local_mac,
 221                           src=self.src_if.remote_mac) /
 222                     IP(id=24339, flags="MF", frag=3, ttl=64,
 223                        src=self.src_if.remote_ip4,
 224                        dst=self.dst_if.remote_ip4) /
 225                     ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) /
 226                     Raw(load='.IPv4.Fragmentation.vali')),
 227                    (Ether(dst=self.src_if.local_mac,
 228                           src=self.src_if.remote_mac) /
 229                     IP(id=24339, frag=6, ttl=64,
 230                        src=self.src_if.remote_ip4,
 231                        dst=self.dst_if.remote_ip4) /
 232                     ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) /
 233                     Raw(load='d; Test-case: 44924'))
 234                    ]
 235
 236         self.pg_enable_capture()
 237         self.src_if.add_stream(packets)
 238         self.pg_start()
 239
 240         self.dst_if.get_capture(1)
 241
 242     def test_frag_1(self):
 243         """ fragment of size 1 """
 244         self.vapi.cli("clear errors")
 245         malformed_packets = [(Ether(dst=self.src_if.local_mac,
 246                                     src=self.src_if.remote_mac) /
 247                               IP(id=7, len=21, flags="MF", frag=0, ttl=64,
 248                                  src=self.src_if.remote_ip4,
 249                                  dst=self.dst_if.remote_ip4) /
 250                               ICMP(type="echo-request")),
 251                              (Ether(dst=self.src_if.local_mac,
 252                                     src=self.src_if.remote_mac) /
 253                               IP(id=7, len=21, frag=1, ttl=64,
 254                                  src=self.src_if.remote_ip4,
 255                                  dst=self.dst_if.remote_ip4) /
 256                               Raw(load='\x08')),
 257                              ]
 258
 259         p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
 260              IP(id=1000, src=self.src_if.remote_ip4,
 261                 dst=self.dst_if.remote_ip4) /
 262              UDP(sport=1234, dport=5678) /
 263              Raw("X" * 1000))
 264         valid_fragments = fragment_rfc791(p, 400)
 265
 266         self.pg_enable_capture()
 267         self.src_if.add_stream(malformed_packets + valid_fragments)
 268         self.pg_start()
 269
 270         self.dst_if.get_capture(1)
 271
 272         self.assert_packet_counter_equal("ip4-reassembly-feature", 1)
 273         # TODO remove above, uncomment below once clearing of counters
 274         # is supported
 275         # self.assert_packet_counter_equal(
 276         #     "/err/ip4-reassembly-feature/malformed packets", 1)
 277
 278     @unittest.skipIf(is_skip_aarch64_set and is_platform_aarch64,
 279                      "test doesn't work on aarch64")
 280     def test_random(self):
 281         """ random order reassembly """
 282
 283         fragments = list(self.fragments_200)
 284         shuffle(fragments)
 285
 286         self.pg_enable_capture()
 287         self.src_if.add_stream(fragments)
 288         self.pg_start()
 289
 290         packets = self.dst_if.get_capture(len(self.packet_infos))
 291         self.verify_capture(packets)
 292         self.src_if.assert_nothing_captured()
 293
 294         # run it all again to verify correctness
 295         self.pg_enable_capture()
 296         self.src_if.add_stream(fragments)
 297         self.pg_start()
 298
 299         packets = self.dst_if.get_capture(len(self.packet_infos))
 300         self.verify_capture(packets)
 301         self.src_if.assert_nothing_captured()
 302
 303     def test_duplicates(self):
 304         """ duplicate fragments """
 305
 306         fragments = [
 307             x for (_, frags, _, _) in self.pkt_infos
 308             for x in frags
 309             for _ in range(0, min(2, len(frags)))
 310         ]
 311
 312         self.pg_enable_capture()
 313         self.src_if.add_stream(fragments)
 314         self.pg_start()
 315
 316         packets = self.dst_if.get_capture(len(self.pkt_infos))
 317         self.verify_capture(packets)
 318         self.src_if.assert_nothing_captured()
 319
 320     def test_overlap1(self):
 321         """ overlapping fragments case #1 """
 322
 323         fragments = []
 324         for _, _, frags_300, frags_200 in self.pkt_infos:
 325             if len(frags_300) == 1:
 326                 fragments.extend(frags_300)
 327             else:
 328                 for i, j in zip(frags_200, frags_300):
 329                     fragments.extend(i)
 330                     fragments.extend(j)
 331
 332         self.pg_enable_capture()
 333         self.src_if.add_stream(fragments)
 334         self.pg_start()
 335
 336         packets = self.dst_if.get_capture(len(self.pkt_infos))
 337         self.verify_capture(packets)
 338         self.src_if.assert_nothing_captured()
 339
 340         # run it all to verify correctness
 341         self.pg_enable_capture()
 342         self.src_if.add_stream(fragments)
 343         self.pg_start()
 344
 345         packets = self.dst_if.get_capture(len(self.pkt_infos))
 346         self.verify_capture(packets)
 347         self.src_if.assert_nothing_captured()
 348
 349     def test_overlap2(self):
 350         """ overlapping fragments case #2 """
 351
 352         fragments = []
 353         for _, _, frags_300, frags_200 in self.pkt_infos:
 354             if len(frags_300) == 1:
 355                 fragments.extend(frags_300)
 356             else:
 357                 # care must be taken here so that there are no fragments
 358                 # received by vpp after reassembly is finished, otherwise
 359                 # new reassemblies will be started and packet generator will
 360                 # freak out when it detects unfreed buffers
 361                 zipped = zip(frags_300, frags_200)
 362                 for i, j in zipped[:-1]:
 363                     fragments.extend(i)
 364                     fragments.extend(j)
 365                 fragments.append(zipped[-1][0])
 366
 367         self.pg_enable_capture()
 368         self.src_if.add_stream(fragments)
 369         self.pg_start()
 370
 371         packets = self.dst_if.get_capture(len(self.pkt_infos))
 372         self.verify_capture(packets)
 373         self.src_if.assert_nothing_captured()
 374
 375         # run it all to verify correctness
 376         self.pg_enable_capture()
 377         self.src_if.add_stream(fragments)
 378         self.pg_start()
 379
 380         packets = self.dst_if.get_capture(len(self.pkt_infos))
 381         self.verify_capture(packets)
 382         self.src_if.assert_nothing_captured()
 383
 384     def test_timeout_inline(self):
 385         """ timeout (inline) """
 386
 387         dropped_packet_indexes = set(
 388             index for (index, frags, _, _) in self.pkt_infos if len(frags) > 1
 389         )
 390
 391         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
 392                                     expire_walk_interval_ms=10000)
 393
 394         self.pg_enable_capture()
 395         self.src_if.add_stream(self.fragments_400)
 396         self.pg_start()
 397
 398         packets = self.dst_if.get_capture(
 399             len(self.pkt_infos) - len(dropped_packet_indexes))
 400         self.verify_capture(packets, dropped_packet_indexes)
 401         self.src_if.assert_nothing_captured()
 402
 403     def test_timeout_cleanup(self):
 404         """ timeout (cleanup) """
 405
 406         # whole packets + fragmented packets sans last fragment
 407         fragments = [
 408             x for (_, frags_400, _, _) in self.pkt_infos
 409             for x in frags_400[:-1 if len(frags_400) > 1 else None]
 410         ]
 411
 412         # last fragments for fragmented packets
 413         fragments2 = [frags_400[-1]
 414                       for (_, frags_400, _, _) in self.pkt_infos
 415                       if len(frags_400) > 1]
 416
 417         dropped_packet_indexes = set(
 418             index for (index, frags_400, _, _) in self.pkt_infos
 419             if len(frags_400) > 1)
 420
 421         self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
 422                                     expire_walk_interval_ms=50)
 423
 424         self.pg_enable_capture()
 425         self.src_if.add_stream(fragments)
 426         self.pg_start()
 427
 428         self.sleep(.25, "wait before sending rest of fragments")
 429
 430         self.src_if.add_stream(fragments2)
 431         self.pg_start()
 432
 433         packets = self.dst_if.get_capture(
 434             len(self.pkt_infos) - len(dropped_packet_indexes))
 435         self.verify_capture(packets, dropped_packet_indexes)
 436         self.src_if.assert_nothing_captured()
 437
 438     def test_disabled(self):
 439         """ reassembly disabled """
 440
 441         dropped_packet_indexes = set(
 442             index for (index, frags_400, _, _) in self.pkt_infos
 443             if len(frags_400) > 1)
 444
 445         self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=0,
 446                                     expire_walk_interval_ms=10000)
 447
 448         self.pg_enable_capture()
 449         self.src_if.add_stream(self.fragments_400)
 450         self.pg_start()
 451
 452         packets = self.dst_if.get_capture(
 453             len(self.pkt_infos) - len(dropped_packet_indexes))
 454         self.verify_capture(packets, dropped_packet_indexes)
 455         self.src_if.assert_nothing_captured()
 456
 457
 458 class TestIPv6Reassembly(VppTestCase):
 459     """ IPv6 Reassembly """
 460
 461     @classmethod
 462     def setUpClass(cls):
 463         super(TestIPv6Reassembly, cls).setUpClass()
 464
 465         cls.create_pg_interfaces([0, 1])
 466         cls.src_if = cls.pg0
 467         cls.dst_if = cls.pg1
 468
 469         # setup all interfaces
 470         for i in cls.pg_interfaces:
 471             i.admin_up()
 472             i.config_ip6()
 473             i.resolve_ndp()
 474
 475         # packet sizes
 476         cls.packet_sizes = [64, 512, 1518, 9018]
 477         cls.padding = " abcdefghijklmn"
 478         cls.create_stream(cls.packet_sizes)
 479         cls.create_fragments()
 480
 481     def setUp(self):
 482         """ Test setup - force timeout on existing reassemblies """
 483         super(TestIPv6Reassembly, self).setUp()
 484         self.vapi.ip_reassembly_enable_disable(
 485             sw_if_index=self.src_if.sw_if_index, enable_ip6=True)
 486         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
 487                                     expire_walk_interval_ms=10, is_ip6=1)
 488         self.sleep(.25)
 489         self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
 490                                     expire_walk_interval_ms=10000, is_ip6=1)
 491         self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
 492
 493     def tearDown(self):
 494         super(TestIPv6Reassembly, self).tearDown()
 495         self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
 496
 497     @classmethod
 498     def create_stream(cls, packet_sizes, packet_count=test_packet_count):
 499         """Create input packet stream for defined interface.
 500
 501         :param list packet_sizes: Required packet sizes.
 502         """
 503         for i in range(0, packet_count):
 504             info = cls.create_packet_info(cls.src_if, cls.src_if)
 505             payload = cls.info_to_payload(info)
 506             p = (Ether(dst=cls.src_if.local_mac, src=cls.src_if.remote_mac) /
 507                  IPv6(src=cls.src_if.remote_ip6,
 508                       dst=cls.dst_if.remote_ip6) /
 509                  UDP(sport=1234, dport=5678) /
 510                  Raw(payload))
 511             size = packet_sizes[(i // 2) % len(packet_sizes)]
 512             cls.extend_packet(p, size, cls.padding)
 513             info.data = p
 514
 515     @classmethod
 516     def create_fragments(cls):
 517         infos = cls._packet_infos
 518         cls.pkt_infos = []
 519         for index, info in six.iteritems(infos):
 520             p = info.data
 521             # cls.logger.debug(ppp("Packet:", p.__class__(str(p))))
 522             fragments_400 = fragment_rfc8200(p, info.index, 400)
 523             fragments_300 = fragment_rfc8200(p, info.index, 300)
 524             cls.pkt_infos.append((index, fragments_400, fragments_300))
 525         cls.fragments_400 = [
 526             x for _, frags, _ in cls.pkt_infos for x in frags]
 527         cls.fragments_300 = [
 528             x for _, _, frags in cls.pkt_infos for x in frags]
 529         cls.logger.debug("Fragmented %s packets into %s 400-byte fragments, "
 530                          "and %s 300-byte fragments" %
 531                          (len(infos), len(cls.fragments_400),
 532                              len(cls.fragments_300)))
 533
 534     def verify_capture(self, capture, dropped_packet_indexes=[]):
 535         """Verify captured packet strea .
 536
 537         :param list capture: Captured packet stream.
 538         """
 539         info = None
 540         seen = set()
 541         for packet in capture:
 542             try:
 543                 self.logger.debug(ppp("Got packet:", packet))
 544                 ip = packet[IPv6]
 545                 udp = packet[UDP]
 546                 payload_info = self.payload_to_info(str(packet[Raw]))
 547                 packet_index = payload_info.index
 548                 self.assertTrue(
 549                     packet_index not in dropped_packet_indexes,
 550                     ppp("Packet received, but should be dropped:", packet))
 551                 if packet_index in seen:
 552                     raise Exception(ppp("Duplicate packet received", packet))
 553                 seen.add(packet_index)
 554                 self.assertEqual(payload_info.dst, self.src_if.sw_if_index)
 555                 info = self._packet_infos[packet_index]
 556                 self.assertTrue(info is not None)
 557                 self.assertEqual(packet_index, info.index)
 558                 saved_packet = info.data
 559                 self.assertEqual(ip.src, saved_packet[IPv6].src)
 560                 self.assertEqual(ip.dst, saved_packet[IPv6].dst)
 561                 self.assertEqual(udp.payload, saved_packet[UDP].payload)
 562             except Exception:
 563                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
 564                 raise
 565         for index in self._packet_infos:
 566             self.assertTrue(index in seen or index in dropped_packet_indexes,
 567                             "Packet with packet_index %d not received" % index)
 568
 569     def test_reassembly(self):
 570         """ basic reassembly """
 571
 572         self.pg_enable_capture()
 573         self.src_if.add_stream(self.fragments_400)
 574         self.pg_start()
 575
 576         packets = self.dst_if.get_capture(len(self.pkt_infos))
 577         self.verify_capture(packets)
 578         self.src_if.assert_nothing_captured()
 579
 580         # run it all again to verify correctness
 581         self.pg_enable_capture()
 582         self.src_if.add_stream(self.fragments_400)
 583         self.pg_start()
 584
 585         packets = self.dst_if.get_capture(len(self.pkt_infos))
 586         self.verify_capture(packets)
 587         self.src_if.assert_nothing_captured()
 588
 589     def test_reversed(self):
 590         """ reverse order reassembly """
 591
 592         fragments = list(self.fragments_400)
 593         fragments.reverse()
 594
 595         self.pg_enable_capture()
 596         self.src_if.add_stream(fragments)
 597         self.pg_start()
 598
 599         packets = self.dst_if.get_capture(len(self.pkt_infos))
 600         self.verify_capture(packets)
 601         self.src_if.assert_nothing_captured()
 602
 603         # run it all again to verify correctness
 604         self.pg_enable_capture()
 605         self.src_if.add_stream(fragments)
 606         self.pg_start()
 607
 608         packets = self.dst_if.get_capture(len(self.pkt_infos))
 609         self.verify_capture(packets)
 610         self.src_if.assert_nothing_captured()
 611
 612     def test_random(self):
 613         """ random order reassembly """
 614
 615         fragments = list(self.fragments_400)
 616         shuffle(fragments)
 617
 618         self.pg_enable_capture()
 619         self.src_if.add_stream(fragments)
 620         self.pg_start()
 621
 622         packets = self.dst_if.get_capture(len(self.pkt_infos))
 623         self.verify_capture(packets)
 624         self.src_if.assert_nothing_captured()
 625
 626         # run it all again to verify correctness
 627         self.pg_enable_capture()
 628         self.src_if.add_stream(fragments)
 629         self.pg_start()
 630
 631         packets = self.dst_if.get_capture(len(self.pkt_infos))
 632         self.verify_capture(packets)
 633         self.src_if.assert_nothing_captured()
 634
 635     def test_duplicates(self):
 636         """ duplicate fragments """
 637
 638         fragments = [
 639             x for (_, frags, _) in self.pkt_infos
 640             for x in frags
 641             for _ in range(0, min(2, len(frags)))
 642         ]
 643
 644         self.pg_enable_capture()
 645         self.src_if.add_stream(fragments)
 646         self.pg_start()
 647
 648         packets = self.dst_if.get_capture(len(self.pkt_infos))
 649         self.verify_capture(packets)
 650         self.src_if.assert_nothing_captured()
 651
 652     def test_overlap1(self):
 653         """ overlapping fragments case #1 """
 654
 655         fragments = []
 656         for _, frags_400, frags_300 in self.pkt_infos:
 657             if len(frags_300) == 1:
 658                 fragments.extend(frags_400)
 659             else:
 660                 for i, j in zip(frags_300, frags_400):
 661                     fragments.extend(i)
 662                     fragments.extend(j)
 663
 664         dropped_packet_indexes = set(
 665             index for (index, _, frags) in self.pkt_infos if len(frags) > 1
 666         )
 667
 668         self.pg_enable_capture()
 669         self.src_if.add_stream(fragments)
 670         self.pg_start()
 671
 672         packets = self.dst_if.get_capture(
 673             len(self.pkt_infos) - len(dropped_packet_indexes))
 674         self.verify_capture(packets, dropped_packet_indexes)
 675         self.src_if.assert_nothing_captured()
 676
 677     def test_overlap2(self):
 678         """ overlapping fragments case #2 """
 679
 680         fragments = []
 681         for _, frags_400, frags_300 in self.pkt_infos:
 682             if len(frags_400) == 1:
 683                 fragments.extend(frags_400)
 684             else:
 685                 # care must be taken here so that there are no fragments
 686                 # received by vpp after reassembly is finished, otherwise
 687                 # new reassemblies will be started and packet generator will
 688                 # freak out when it detects unfreed buffers
 689                 zipped = zip(frags_400, frags_300)
 690                 for i, j in zipped[:-1]:
 691                     fragments.extend(i)
 692                     fragments.extend(j)
 693                 fragments.append(zipped[-1][0])
 694
 695         dropped_packet_indexes = set(
 696             index for (index, _, frags) in self.pkt_infos if len(frags) > 1
 697         )
 698
 699         self.pg_enable_capture()
 700         self.src_if.add_stream(fragments)
 701         self.pg_start()
 702
 703         packets = self.dst_if.get_capture(
 704             len(self.pkt_infos) - len(dropped_packet_indexes))
 705         self.verify_capture(packets, dropped_packet_indexes)
 706         self.src_if.assert_nothing_captured()
 707
 708     def test_timeout_inline(self):
 709         """ timeout (inline) """
 710
 711         dropped_packet_indexes = set(
 712             index for (index, frags, _) in self.pkt_infos if len(frags) > 1
 713         )
 714
 715         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
 716                                     expire_walk_interval_ms=10000, is_ip6=1)
 717
 718         self.pg_enable_capture()
 719         self.src_if.add_stream(self.fragments_400)
 720         self.pg_start()
 721
 722         packets = self.dst_if.get_capture(
 723             len(self.pkt_infos) - len(dropped_packet_indexes))
 724         self.verify_capture(packets, dropped_packet_indexes)
 725         pkts = self.src_if.get_capture(
 726             expected_count=len(dropped_packet_indexes))
 727         for icmp in pkts:
 728             self.assertIn(ICMPv6TimeExceeded, icmp)
 729             self.assertIn(IPv6ExtHdrFragment, icmp)
 730             self.assertIn(icmp[IPv6ExtHdrFragment].id, dropped_packet_indexes)
 731             dropped_packet_indexes.remove(icmp[IPv6ExtHdrFragment].id)
 732
 733     def test_timeout_cleanup(self):
 734         """ timeout (cleanup) """
 735
 736         # whole packets + fragmented packets sans last fragment
 737         fragments = [
 738             x for (_, frags_400, _) in self.pkt_infos
 739             for x in frags_400[:-1 if len(frags_400) > 1 else None]
 740         ]
 741
 742         # last fragments for fragmented packets
 743         fragments2 = [frags_400[-1]
 744                       for (_, frags_400, _) in self.pkt_infos
 745                       if len(frags_400) > 1]
 746
 747         dropped_packet_indexes = set(
 748             index for (index, frags_400, _) in self.pkt_infos
 749             if len(frags_400) > 1)
 750
 751         self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
 752                                     expire_walk_interval_ms=50)
 753
 754         self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
 755                                     expire_walk_interval_ms=50, is_ip6=1)
 756
 757         self.pg_enable_capture()
 758         self.src_if.add_stream(fragments)
 759         self.pg_start()
 760
 761         self.sleep(.25, "wait before sending rest of fragments")
 762
 763         self.src_if.add_stream(fragments2)
 764         self.pg_start()
 765
 766         packets = self.dst_if.get_capture(
 767             len(self.pkt_infos) - len(dropped_packet_indexes))
 768         self.verify_capture(packets, dropped_packet_indexes)
 769         pkts = self.src_if.get_capture(
 770             expected_count=len(dropped_packet_indexes))
 771         for icmp in pkts:
 772             self.assertIn(ICMPv6TimeExceeded, icmp)
 773             self.assertIn(IPv6ExtHdrFragment, icmp)
 774             self.assertIn(icmp[IPv6ExtHdrFragment].id, dropped_packet_indexes)
 775             dropped_packet_indexes.remove(icmp[IPv6ExtHdrFragment].id)
 776
 777     def test_disabled(self):
 778         """ reassembly disabled """
 779
 780         dropped_packet_indexes = set(
 781             index for (index, frags_400, _) in self.pkt_infos
 782             if len(frags_400) > 1)
 783
 784         self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=0,
 785                                     expire_walk_interval_ms=10000, is_ip6=1)
 786
 787         self.pg_enable_capture()
 788         self.src_if.add_stream(self.fragments_400)
 789         self.pg_start()
 790
 791         packets = self.dst_if.get_capture(
 792             len(self.pkt_infos) - len(dropped_packet_indexes))
 793         self.verify_capture(packets, dropped_packet_indexes)
 794         self.src_if.assert_nothing_captured()
 795
 796     def test_missing_upper(self):
 797         """ missing upper layer """
 798         p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
 799              IPv6(src=self.src_if.remote_ip6,
 800                   dst=self.src_if.local_ip6) /
 801              UDP(sport=1234, dport=5678) /
 802              Raw())
 803         self.extend_packet(p, 1000, self.padding)
 804         fragments = fragment_rfc8200(p, 1, 500)
 805         bad_fragment = p.__class__(str(fragments[1]))
 806         bad_fragment[IPv6ExtHdrFragment].nh = 59
 807         bad_fragment[IPv6ExtHdrFragment].offset = 0
 808         self.pg_enable_capture()
 809         self.src_if.add_stream([bad_fragment])
 810         self.pg_start()
 811         pkts = self.src_if.get_capture(expected_count=1)
 812         icmp = pkts[0]
 813         self.assertIn(ICMPv6ParamProblem, icmp)
 814         self.assert_equal(icmp[ICMPv6ParamProblem].code, 3, "ICMP code")
 815
 816     def test_invalid_frag_size(self):
 817         """ fragment size not a multiple of 8 """
 818         p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
 819              IPv6(src=self.src_if.remote_ip6,
 820                   dst=self.src_if.local_ip6) /
 821              UDP(sport=1234, dport=5678) /
 822              Raw())
 823         self.extend_packet(p, 1000, self.padding)
 824         fragments = fragment_rfc8200(p, 1, 500)
 825         bad_fragment = fragments[0]
 826         self.extend_packet(bad_fragment, len(bad_fragment) + 5)
 827         self.pg_enable_capture()
 828         self.src_if.add_stream([bad_fragment])
 829         self.pg_start()
 830         pkts = self.src_if.get_capture(expected_count=1)
 831         icmp = pkts[0]
 832         self.assertIn(ICMPv6ParamProblem, icmp)
 833         self.assert_equal(icmp[ICMPv6ParamProblem].code, 0, "ICMP code")
 834
 835     def test_invalid_packet_size(self):
 836         """ total packet size > 65535 """
 837         p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
 838              IPv6(src=self.src_if.remote_ip6,
 839                   dst=self.src_if.local_ip6) /
 840              UDP(sport=1234, dport=5678) /
 841              Raw())
 842         self.extend_packet(p, 1000, self.padding)
 843         fragments = fragment_rfc8200(p, 1, 500)
 844         bad_fragment = fragments[1]
 845         bad_fragment[IPv6ExtHdrFragment].offset = 65500
 846         self.pg_enable_capture()
 847         self.src_if.add_stream([bad_fragment])
 848         self.pg_start()
 849         pkts = self.src_if.get_capture(expected_count=1)
 850         icmp = pkts[0]
 851         self.assertIn(ICMPv6ParamProblem, icmp)
 852         self.assert_equal(icmp[ICMPv6ParamProblem].code, 0, "ICMP code")
 853
 854
 855 class TestIPv4ReassemblyLocalNode(VppTestCase):
 856     """ IPv4 Reassembly for packets coming to ip4-local node """
 857
 858     @classmethod
 859     def setUpClass(cls):
 860         super(TestIPv4ReassemblyLocalNode, cls).setUpClass()
 861
 862         cls.create_pg_interfaces([0])
 863         cls.src_dst_if = cls.pg0
 864
 865         # setup all interfaces
 866         for i in cls.pg_interfaces:
 867             i.admin_up()
 868             i.config_ip4()
 869             i.resolve_arp()
 870
 871         cls.padding = " abcdefghijklmn"
 872         cls.create_stream()
 873         cls.create_fragments()
 874
 875     def setUp(self):
 876         """ Test setup - force timeout on existing reassemblies """
 877         super(TestIPv4ReassemblyLocalNode, self).setUp()
 878         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
 879                                     expire_walk_interval_ms=10)
 880         self.sleep(.25)
 881         self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
 882                                     expire_walk_interval_ms=10000)
 883
 884     def tearDown(self):
 885         super(TestIPv4ReassemblyLocalNode, self).tearDown()
 886         self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
 887
 888     @classmethod
 889     def create_stream(cls, packet_count=test_packet_count):
 890         """Create input packet stream for defined interface.
 891
 892         :param list packet_sizes: Required packet sizes.
 893         """
 894         for i in range(0, packet_count):
 895             info = cls.create_packet_info(cls.src_dst_if, cls.src_dst_if)
 896             payload = cls.info_to_payload(info)
 897             p = (Ether(dst=cls.src_dst_if.local_mac,
 898                        src=cls.src_dst_if.remote_mac) /
 899                  IP(id=info.index, src=cls.src_dst_if.remote_ip4,
 900                     dst=cls.src_dst_if.local_ip4) /
 901                  ICMP(type='echo-request', id=1234) /
 902                  Raw(payload))
 903             cls.extend_packet(p, 1518, cls.padding)
 904             info.data = p
 905
 906     @classmethod
 907     def create_fragments(cls):
 908         infos = cls._packet_infos
 909         cls.pkt_infos = []
 910         for index, info in six.iteritems(infos):
 911             p = info.data
 912             # cls.logger.debug(ppp("Packet:", p.__class__(str(p))))
 913             fragments_300 = fragment_rfc791(p, 300)
 914             cls.pkt_infos.append((index, fragments_300))
 915         cls.fragments_300 = [x for (_, frags) in cls.pkt_infos for x in frags]
 916         cls.logger.debug("Fragmented %s packets into %s 300-byte fragments" %
 917                          (len(infos), len(cls.fragments_300)))
 918
 919     def verify_capture(self, capture):
 920         """Verify captured packet stream.
 921
 922         :param list capture: Captured packet stream.
 923         """
 924         info = None
 925         seen = set()
 926         for packet in capture:
 927             try:
 928                 self.logger.debug(ppp("Got packet:", packet))
 929                 ip = packet[IP]
 930                 icmp = packet[ICMP]
 931                 payload_info = self.payload_to_info(str(packet[Raw]))
 932                 packet_index = payload_info.index
 933                 if packet_index in seen:
 934                     raise Exception(ppp("Duplicate packet received", packet))
 935                 seen.add(packet_index)
 936                 self.assertEqual(payload_info.dst, self.src_dst_if.sw_if_index)
 937                 info = self._packet_infos[packet_index]
 938                 self.assertIsNotNone(info)
 939                 self.assertEqual(packet_index, info.index)
 940                 saved_packet = info.data
 941                 self.assertEqual(ip.src, saved_packet[IP].dst)
 942                 self.assertEqual(ip.dst, saved_packet[IP].src)
 943                 self.assertEqual(icmp.type, 0)  # echo reply
 944                 self.assertEqual(icmp.id, saved_packet[ICMP].id)
 945                 self.assertEqual(icmp.payload, saved_packet[ICMP].payload)
 946             except Exception:
 947                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
 948                 raise
 949         for index in self._packet_infos:
 950             self.assertIn(index, seen,
 951                           "Packet with packet_index %d not received" % index)
 952
 953     def test_reassembly(self):
 954         """ basic reassembly """
 955
 956         self.pg_enable_capture()
 957         self.src_dst_if.add_stream(self.fragments_300)
 958         self.pg_start()
 959
 960         packets = self.src_dst_if.get_capture(len(self.pkt_infos))
 961         self.verify_capture(packets)
 962
 963         # run it all again to verify correctness
 964         self.pg_enable_capture()
 965         self.src_dst_if.add_stream(self.fragments_300)
 966         self.pg_start()
 967
 968         packets = self.src_dst_if.get_capture(len(self.pkt_infos))
 969         self.verify_capture(packets)
 970
 971
 972 class TestFIFReassembly(VppTestCase):
 973     """ Fragments in fragments reassembly """
 974
 975     @classmethod
 976     def setUpClass(cls):
 977         super(TestFIFReassembly, cls).setUpClass()
 978
 979         cls.create_pg_interfaces([0, 1])
 980         cls.src_if = cls.pg0
 981         cls.dst_if = cls.pg1
 982         for i in cls.pg_interfaces:
 983             i.admin_up()
 984             i.config_ip4()
 985             i.resolve_arp()
 986             i.config_ip6()
 987             i.resolve_ndp()
 988
 989         cls.packet_sizes = [64, 512, 1518, 9018]
 990         cls.padding = " abcdefghijklmn"
 991
 992     def setUp(self):
 993         """ Test setup - force timeout on existing reassemblies """
 994         super(TestFIFReassembly, self).setUp()
 995         self.vapi.ip_reassembly_enable_disable(
 996             sw_if_index=self.src_if.sw_if_index, enable_ip4=True,
 997             enable_ip6=True)
 998         self.vapi.ip_reassembly_enable_disable(
 999             sw_if_index=self.dst_if.sw_if_index, enable_ip4=True,
1000             enable_ip6=True)
1001         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
1002                                     expire_walk_interval_ms=10)
1003         self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
1004                                     expire_walk_interval_ms=10, is_ip6=1)
1005         self.sleep(.25)
1006         self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
1007                                     expire_walk_interval_ms=10000)
1008         self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
1009                                     expire_walk_interval_ms=10000, is_ip6=1)
1010
1011     def tearDown(self):
1012         self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
1013         self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
1014         super(TestFIFReassembly, self).tearDown()
1015
1016     def verify_capture(self, capture, ip_class, dropped_packet_indexes=[]):
1017         """Verify captured packet stream.
1018
1019         :param list capture: Captured packet stream.
1020         """
1021         info = None
1022         seen = set()
1023         for packet in capture:
1024             try:
1025                 self.logger.debug(ppp("Got packet:", packet))
1026                 ip = packet[ip_class]
1027                 udp = packet[UDP]
1028                 payload_info = self.payload_to_info(str(packet[Raw]))
1029                 packet_index = payload_info.index
1030                 self.assertTrue(
1031                     packet_index not in dropped_packet_indexes,
1032                     ppp("Packet received, but should be dropped:", packet))
1033                 if packet_index in seen:
1034                     raise Exception(ppp("Duplicate packet received", packet))
1035                 seen.add(packet_index)
1036                 self.assertEqual(payload_info.dst, self.dst_if.sw_if_index)
1037                 info = self._packet_infos[packet_index]
1038                 self.assertTrue(info is not None)
1039                 self.assertEqual(packet_index, info.index)
1040                 saved_packet = info.data
1041                 self.assertEqual(ip.src, saved_packet[ip_class].src)
1042                 self.assertEqual(ip.dst, saved_packet[ip_class].dst)
1043                 self.assertEqual(udp.payload, saved_packet[UDP].payload)
1044             except Exception:
1045                 self.logger.error(ppp("Unexpected or invalid packet:", packet))
1046                 raise
1047         for index in self._packet_infos:
1048             self.assertTrue(index in seen or index in dropped_packet_indexes,
1049                             "Packet with packet_index %d not received" % index)
1050
1051     def test_fif4(self):
1052         """ Fragments in fragments (4o4) """
1053
1054         # TODO this should be ideally in setUpClass, but then we hit a bug
1055         # with VppIpRoute incorrectly reporting it's present when it's not
1056         # so we need to manually remove the vpp config, thus we cannot have
1057         # it shared for multiple test cases
1058         self.tun_ip4 = "1.1.1.2"
1059
1060         self.gre4 = VppGreInterface(self, self.src_if.local_ip4, self.tun_ip4)
1061         self.gre4.add_vpp_config()
1062         self.gre4.admin_up()
1063         self.gre4.config_ip4()
1064
1065         self.vapi.ip_reassembly_enable_disable(
1066             sw_if_index=self.gre4.sw_if_index, enable_ip4=True)
1067
1068         self.route4 = VppIpRoute(self, self.tun_ip4, 32,
1069                                  [VppRoutePath(self.src_if.remote_ip4,
1070                                                self.src_if.sw_if_index)])
1071         self.route4.add_vpp_config()
1072
1073         self.reset_packet_infos()
1074         for i in range(test_packet_count):
1075             info = self.create_packet_info(self.src_if, self.dst_if)
1076             payload = self.info_to_payload(info)
1077             # Ethernet header here is only for size calculation, thus it
1078             # doesn't matter how it's initialized. This is to ensure that
1079             # reassembled packet is not > 9000 bytes, so that it's not dropped
1080             p = (Ether() /
1081                  IP(id=i, src=self.src_if.remote_ip4,
1082                     dst=self.dst_if.remote_ip4) /
1083                  UDP(sport=1234, dport=5678) /
1084                  Raw(payload))
1085             size = self.packet_sizes[(i // 2) % len(self.packet_sizes)]
1086             self.extend_packet(p, size, self.padding)
1087             info.data = p[IP]  # use only IP part, without ethernet header
1088
1089         fragments = [x for _, p in six.iteritems(self._packet_infos)
1090                      for x in fragment_rfc791(p.data, 400)]
1091
1092         encapped_fragments = \
1093             [Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
1094              IP(src=self.tun_ip4, dst=self.src_if.local_ip4) /
1095                 GRE() /
1096                 p
1097                 for p in fragments]
1098
1099         fragmented_encapped_fragments = \
1100             [x for p in encapped_fragments
1101              for x in fragment_rfc791(p, 200)]
1102
1103         self.src_if.add_stream(fragmented_encapped_fragments)
1104
1105         self.pg_enable_capture(self.pg_interfaces)
1106         self.pg_start()
1107
1108         self.src_if.assert_nothing_captured()
1109         packets = self.dst_if.get_capture(len(self._packet_infos))
1110         self.verify_capture(packets, IP)
1111
1112         # TODO remove gre vpp config by hand until VppIpRoute gets fixed
1113         # so that it's query_vpp_config() works as it should
1114         self.gre4.remove_vpp_config()
1115         self.logger.debug(self.vapi.ppcli("show interface"))
1116
1117     def test_fif6(self):
1118         """ Fragments in fragments (6o6) """
1119         # TODO this should be ideally in setUpClass, but then we hit a bug
1120         # with VppIpRoute incorrectly reporting it's present when it's not
1121         # so we need to manually remove the vpp config, thus we cannot have
1122         # it shared for multiple test cases
1123         self.tun_ip6 = "1002::1"
1124
1125         self.gre6 = VppGre6Interface(self, self.src_if.local_ip6, self.tun_ip6)
1126         self.gre6.add_vpp_config()
1127         self.gre6.admin_up()
1128         self.gre6.config_ip6()
1129
1130         self.vapi.ip_reassembly_enable_disable(
1131             sw_if_index=self.gre6.sw_if_index, enable_ip6=True)
1132
1133         self.route6 = VppIpRoute(self, self.tun_ip6, 128,
1134                                  [VppRoutePath(self.src_if.remote_ip6,
1135                                                self.src_if.sw_if_index,
1136                                                proto=DpoProto.DPO_PROTO_IP6)],
1137                                  is_ip6=1)
1138         self.route6.add_vpp_config()
1139
1140         self.reset_packet_infos()
1141         for i in range(test_packet_count):
1142             info = self.create_packet_info(self.src_if, self.dst_if)
1143             payload = self.info_to_payload(info)
1144             # Ethernet header here is only for size calculation, thus it
1145             # doesn't matter how it's initialized. This is to ensure that
1146             # reassembled packet is not > 9000 bytes, so that it's not dropped
1147             p = (Ether() /
1148                  IPv6(src=self.src_if.remote_ip6, dst=self.dst_if.remote_ip6) /
1149                  UDP(sport=1234, dport=5678) /
1150                  Raw(payload))
1151             size = self.packet_sizes[(i // 2) % len(self.packet_sizes)]
1152             self.extend_packet(p, size, self.padding)
1153             info.data = p[IPv6]  # use only IPv6 part, without ethernet header
1154
1155         fragments = [x for _, i in six.iteritems(self._packet_infos)
1156                      for x in fragment_rfc8200(
1157                          i.data, i.index, 400)]
1158
1159         encapped_fragments = \
1160             [Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
1161              IPv6(src=self.tun_ip6, dst=self.src_if.local_ip6) /
1162                 GRE() /
1163                 p
1164                 for p in fragments]
1165
1166         fragmented_encapped_fragments = \
1167             [x for p in encapped_fragments for x in (
1168                 fragment_rfc8200(
1169                     p,
1170                     2 * len(self._packet_infos) + p[IPv6ExtHdrFragment].id,
1171                     200)
1172                 if IPv6ExtHdrFragment in p else [p]
1173             )
1174             ]
1175
1176         self.src_if.add_stream(fragmented_encapped_fragments)
1177
1178         self.pg_enable_capture(self.pg_interfaces)
1179         self.pg_start()
1180
1181         self.src_if.assert_nothing_captured()
1182         packets = self.dst_if.get_capture(len(self._packet_infos))
1183         self.verify_capture(packets, IPv6)
1184
1185         # TODO remove gre vpp config by hand until VppIpRoute gets fixed
1186         # so that it's query_vpp_config() works as it should
1187         self.gre6.remove_vpp_config()
1188
1189
1190 if __name__ == '__main__':
1191     unittest.main(testRunner=VppTestRunner)