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-rw-r--r--test/test_reassembly.py972
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diff --git a/test/test_reassembly.py b/test/test_reassembly.py
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+++ b/test/test_reassembly.py
@@ -0,0 +1,972 @@
+#!/usr/bin/env python
+import unittest
+from random import shuffle
+
+from framework import VppTestCase, VppTestRunner
+
+from scapy.packet import Raw
+from scapy.layers.l2 import Ether, GRE
+from scapy.layers.inet import IP, UDP
+from util import ppp, fragment_rfc791, fragment_rfc8200
+from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, ICMPv6ParamProblem,\
+ ICMPv6TimeExceeded
+from vpp_gre_interface import VppGreInterface, VppGre6Interface
+from vpp_ip_route import VppIpRoute, VppRoutePath, DpoProto
+
+test_packet_count = 257
+
+
+class TestIPv4Reassembly(VppTestCase):
+ """ IPv4 Reassembly """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestIPv4Reassembly, cls).setUpClass()
+
+ cls.create_pg_interfaces([0, 1])
+ cls.src_if = cls.pg0
+ cls.dst_if = cls.pg1
+
+ # setup all interfaces
+ for i in cls.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+
+ # packet sizes
+ cls.packet_sizes = [64, 512, 1518, 9018]
+ cls.padding = " abcdefghijklmn"
+ cls.create_stream(cls.packet_sizes)
+ cls.create_fragments()
+
+ def setUp(self):
+ """ Test setup - force timeout on existing reassemblies """
+ super(TestIPv4Reassembly, self).setUp()
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.src_if.sw_if_index, enable_ip4=True)
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10)
+ self.sleep(.25)
+ self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
+ expire_walk_interval_ms=10000)
+
+ def tearDown(self):
+ super(TestIPv4Reassembly, self).tearDown()
+ self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
+
+ @classmethod
+ def create_stream(cls, packet_sizes, packet_count=test_packet_count):
+ """Create input packet stream for defined interface.
+
+ :param list packet_sizes: Required packet sizes.
+ """
+ for i in range(0, packet_count):
+ info = cls.create_packet_info(cls.src_if, cls.src_if)
+ payload = cls.info_to_payload(info)
+ p = (Ether(dst=cls.src_if.local_mac, src=cls.src_if.remote_mac) /
+ IP(id=info.index, src=cls.src_if.remote_ip4,
+ dst=cls.dst_if.remote_ip4) /
+ UDP(sport=1234, dport=5678) /
+ Raw(payload))
+ size = packet_sizes[(i // 2) % len(packet_sizes)]
+ cls.extend_packet(p, size, cls.padding)
+ info.data = p
+
+ @classmethod
+ def create_fragments(cls):
+ infos = cls._packet_infos
+ cls.pkt_infos = []
+ for index, info in infos.iteritems():
+ p = info.data
+ # cls.logger.debug(ppp("Packet:", p.__class__(str(p))))
+ fragments_400 = fragment_rfc791(p, 400)
+ fragments_300 = fragment_rfc791(p, 300)
+ fragments_200 = [
+ x for f in fragments_400 for x in fragment_rfc791(f, 200)]
+ cls.pkt_infos.append(
+ (index, fragments_400, fragments_300, fragments_200))
+ cls.fragments_400 = [
+ x for (_, frags, _, _) in cls.pkt_infos for x in frags]
+ cls.fragments_300 = [
+ x for (_, _, frags, _) in cls.pkt_infos for x in frags]
+ cls.fragments_200 = [
+ x for (_, _, _, frags) in cls.pkt_infos for x in frags]
+ cls.logger.debug("Fragmented %s packets into %s 400-byte fragments, "
+ "%s 300-byte fragments and %s 200-byte fragments" %
+ (len(infos), len(cls.fragments_400),
+ len(cls.fragments_300), len(cls.fragments_200)))
+
+ def verify_capture(self, capture, dropped_packet_indexes=[]):
+ """Verify captured packet stream.
+
+ :param list capture: Captured packet stream.
+ """
+ info = None
+ seen = set()
+ for packet in capture:
+ try:
+ self.logger.debug(ppp("Got packet:", packet))
+ ip = packet[IP]
+ udp = packet[UDP]
+ payload_info = self.payload_to_info(str(packet[Raw]))
+ packet_index = payload_info.index
+ self.assertTrue(
+ packet_index not in dropped_packet_indexes,
+ ppp("Packet received, but should be dropped:", packet))
+ if packet_index in seen:
+ raise Exception(ppp("Duplicate packet received", packet))
+ seen.add(packet_index)
+ self.assertEqual(payload_info.dst, self.src_if.sw_if_index)
+ info = self._packet_infos[packet_index]
+ self.assertTrue(info is not None)
+ self.assertEqual(packet_index, info.index)
+ saved_packet = info.data
+ self.assertEqual(ip.src, saved_packet[IP].src)
+ self.assertEqual(ip.dst, saved_packet[IP].dst)
+ self.assertEqual(udp.payload, saved_packet[UDP].payload)
+ except Exception:
+ self.logger.error(ppp("Unexpected or invalid packet:", packet))
+ raise
+ for index in self._packet_infos:
+ self.assertTrue(index in seen or index in dropped_packet_indexes,
+ "Packet with packet_index %d not received" % index)
+
+ def test_reassembly(self):
+ """ basic reassembly """
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_200)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_200)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_reversed(self):
+ """ reverse order reassembly """
+
+ fragments = list(self.fragments_200)
+ fragments.reverse()
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.packet_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.packet_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_random(self):
+ """ random order reassembly """
+
+ fragments = list(self.fragments_200)
+ shuffle(fragments)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.packet_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.packet_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_duplicates(self):
+ """ duplicate fragments """
+
+ fragments = [
+ x for (_, frags, _, _) in self.pkt_infos
+ for x in frags
+ for _ in range(0, min(2, len(frags)))
+ ]
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_overlap1(self):
+ """ overlapping fragments case #1 """
+
+ fragments = []
+ for _, _, frags_300, frags_200 in self.pkt_infos:
+ if len(frags_300) == 1:
+ fragments.extend(frags_300)
+ else:
+ for i, j in zip(frags_200, frags_300):
+ fragments.extend(i)
+ fragments.extend(j)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_overlap2(self):
+ """ overlapping fragments case #2 """
+
+ fragments = []
+ for _, _, frags_300, frags_200 in self.pkt_infos:
+ if len(frags_300) == 1:
+ fragments.extend(frags_300)
+ else:
+ # care must be taken here so that there are no fragments
+ # received by vpp after reassembly is finished, otherwise
+ # new reassemblies will be started and packet generator will
+ # freak out when it detects unfreed buffers
+ zipped = zip(frags_300, frags_200)
+ for i, j in zipped[:-1]:
+ fragments.extend(i)
+ fragments.extend(j)
+ fragments.append(zipped[-1][0])
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_timeout_inline(self):
+ """ timeout (inline) """
+
+ dropped_packet_indexes = set(
+ index for (index, frags, _, _) in self.pkt_infos if len(frags) > 1
+ )
+
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10000)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+ def test_timeout_cleanup(self):
+ """ timeout (cleanup) """
+
+ # whole packets + fragmented packets sans last fragment
+ fragments = [
+ x for (_, frags_400, _, _) in self.pkt_infos
+ for x in frags_400[:-1 if len(frags_400) > 1 else None]
+ ]
+
+ # last fragments for fragmented packets
+ fragments2 = [frags_400[-1]
+ for (_, frags_400, _, _) in self.pkt_infos
+ if len(frags_400) > 1]
+
+ dropped_packet_indexes = set(
+ index for (index, frags_400, _, _) in self.pkt_infos
+ if len(frags_400) > 1)
+
+ self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
+ expire_walk_interval_ms=50)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ self.sleep(.25, "wait before sending rest of fragments")
+
+ self.src_if.add_stream(fragments2)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+ def test_disabled(self):
+ """ reassembly disabled """
+
+ dropped_packet_indexes = set(
+ index for (index, frags_400, _, _) in self.pkt_infos
+ if len(frags_400) > 1)
+
+ self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=0,
+ expire_walk_interval_ms=10000)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+
+class TestIPv6Reassembly(VppTestCase):
+ """ IPv6 Reassembly """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestIPv6Reassembly, cls).setUpClass()
+
+ cls.create_pg_interfaces([0, 1])
+ cls.src_if = cls.pg0
+ cls.dst_if = cls.pg1
+
+ # setup all interfaces
+ for i in cls.pg_interfaces:
+ i.admin_up()
+ i.config_ip6()
+ i.resolve_ndp()
+
+ # packet sizes
+ cls.packet_sizes = [64, 512, 1518, 9018]
+ cls.padding = " abcdefghijklmn"
+ cls.create_stream(cls.packet_sizes)
+ cls.create_fragments()
+
+ def setUp(self):
+ """ Test setup - force timeout on existing reassemblies """
+ super(TestIPv6Reassembly, self).setUp()
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.src_if.sw_if_index, enable_ip6=True)
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10, is_ip6=1)
+ self.sleep(.25)
+ self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
+ expire_walk_interval_ms=10000, is_ip6=1)
+ self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
+
+ def tearDown(self):
+ super(TestIPv6Reassembly, self).tearDown()
+ self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
+
+ @classmethod
+ def create_stream(cls, packet_sizes, packet_count=test_packet_count):
+ """Create input packet stream for defined interface.
+
+ :param list packet_sizes: Required packet sizes.
+ """
+ for i in range(0, packet_count):
+ info = cls.create_packet_info(cls.src_if, cls.src_if)
+ payload = cls.info_to_payload(info)
+ p = (Ether(dst=cls.src_if.local_mac, src=cls.src_if.remote_mac) /
+ IPv6(src=cls.src_if.remote_ip6,
+ dst=cls.dst_if.remote_ip6) /
+ UDP(sport=1234, dport=5678) /
+ Raw(payload))
+ size = packet_sizes[(i // 2) % len(packet_sizes)]
+ cls.extend_packet(p, size, cls.padding)
+ info.data = p
+
+ @classmethod
+ def create_fragments(cls):
+ infos = cls._packet_infos
+ cls.pkt_infos = []
+ for index, info in infos.iteritems():
+ p = info.data
+ # cls.logger.debug(ppp("Packet:", p.__class__(str(p))))
+ fragments_400 = fragment_rfc8200(p, info.index, 400)
+ fragments_300 = fragment_rfc8200(p, info.index, 300)
+ cls.pkt_infos.append((index, fragments_400, fragments_300))
+ cls.fragments_400 = [
+ x for _, frags, _ in cls.pkt_infos for x in frags]
+ cls.fragments_300 = [
+ x for _, _, frags in cls.pkt_infos for x in frags]
+ cls.logger.debug("Fragmented %s packets into %s 400-byte fragments, "
+ "and %s 300-byte fragments" %
+ (len(infos), len(cls.fragments_400),
+ len(cls.fragments_300)))
+
+ def verify_capture(self, capture, dropped_packet_indexes=[]):
+ """Verify captured packet strea .
+
+ :param list capture: Captured packet stream.
+ """
+ info = None
+ seen = set()
+ for packet in capture:
+ try:
+ self.logger.debug(ppp("Got packet:", packet))
+ ip = packet[IPv6]
+ udp = packet[UDP]
+ payload_info = self.payload_to_info(str(packet[Raw]))
+ packet_index = payload_info.index
+ self.assertTrue(
+ packet_index not in dropped_packet_indexes,
+ ppp("Packet received, but should be dropped:", packet))
+ if packet_index in seen:
+ raise Exception(ppp("Duplicate packet received", packet))
+ seen.add(packet_index)
+ self.assertEqual(payload_info.dst, self.src_if.sw_if_index)
+ info = self._packet_infos[packet_index]
+ self.assertTrue(info is not None)
+ self.assertEqual(packet_index, info.index)
+ saved_packet = info.data
+ self.assertEqual(ip.src, saved_packet[IPv6].src)
+ self.assertEqual(ip.dst, saved_packet[IPv6].dst)
+ self.assertEqual(udp.payload, saved_packet[UDP].payload)
+ except Exception:
+ self.logger.error(ppp("Unexpected or invalid packet:", packet))
+ raise
+ for index in self._packet_infos:
+ self.assertTrue(index in seen or index in dropped_packet_indexes,
+ "Packet with packet_index %d not received" % index)
+
+ def test_reassembly(self):
+ """ basic reassembly """
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_reversed(self):
+ """ reverse order reassembly """
+
+ fragments = list(self.fragments_400)
+ fragments.reverse()
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_random(self):
+ """ random order reassembly """
+
+ fragments = list(self.fragments_400)
+ shuffle(fragments)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ # run it all again to verify correctness
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_duplicates(self):
+ """ duplicate fragments """
+
+ fragments = [
+ x for (_, frags, _) in self.pkt_infos
+ for x in frags
+ for _ in range(0, min(2, len(frags)))
+ ]
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(len(self.pkt_infos))
+ self.verify_capture(packets)
+ self.src_if.assert_nothing_captured()
+
+ def test_overlap1(self):
+ """ overlapping fragments case #1 """
+
+ fragments = []
+ for _, frags_400, frags_300 in self.pkt_infos:
+ if len(frags_300) == 1:
+ fragments.extend(frags_400)
+ else:
+ for i, j in zip(frags_300, frags_400):
+ fragments.extend(i)
+ fragments.extend(j)
+
+ dropped_packet_indexes = set(
+ index for (index, _, frags) in self.pkt_infos if len(frags) > 1
+ )
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+ def test_overlap2(self):
+ """ overlapping fragments case #2 """
+
+ fragments = []
+ for _, frags_400, frags_300 in self.pkt_infos:
+ if len(frags_400) == 1:
+ fragments.extend(frags_400)
+ else:
+ # care must be taken here so that there are no fragments
+ # received by vpp after reassembly is finished, otherwise
+ # new reassemblies will be started and packet generator will
+ # freak out when it detects unfreed buffers
+ zipped = zip(frags_400, frags_300)
+ for i, j in zipped[:-1]:
+ fragments.extend(i)
+ fragments.extend(j)
+ fragments.append(zipped[-1][0])
+
+ dropped_packet_indexes = set(
+ index for (index, _, frags) in self.pkt_infos if len(frags) > 1
+ )
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+ def test_timeout_inline(self):
+ """ timeout (inline) """
+
+ dropped_packet_indexes = set(
+ index for (index, frags, _) in self.pkt_infos if len(frags) > 1
+ )
+
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10000, is_ip6=1)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ pkts = self.src_if.get_capture(
+ expected_count=len(dropped_packet_indexes))
+ for icmp in pkts:
+ self.assertIn(ICMPv6TimeExceeded, icmp)
+ self.assertIn(IPv6ExtHdrFragment, icmp)
+ self.assertIn(icmp[IPv6ExtHdrFragment].id, dropped_packet_indexes)
+ dropped_packet_indexes.remove(icmp[IPv6ExtHdrFragment].id)
+
+ def test_timeout_cleanup(self):
+ """ timeout (cleanup) """
+
+ # whole packets + fragmented packets sans last fragment
+ fragments = [
+ x for (_, frags_400, _) in self.pkt_infos
+ for x in frags_400[:-1 if len(frags_400) > 1 else None]
+ ]
+
+ # last fragments for fragmented packets
+ fragments2 = [frags_400[-1]
+ for (_, frags_400, _) in self.pkt_infos
+ if len(frags_400) > 1]
+
+ dropped_packet_indexes = set(
+ index for (index, frags_400, _) in self.pkt_infos
+ if len(frags_400) > 1)
+
+ self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
+ expire_walk_interval_ms=50)
+
+ self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000,
+ expire_walk_interval_ms=50, is_ip6=1)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments)
+ self.pg_start()
+
+ self.sleep(.25, "wait before sending rest of fragments")
+
+ self.src_if.add_stream(fragments2)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ pkts = self.src_if.get_capture(
+ expected_count=len(dropped_packet_indexes))
+ for icmp in pkts:
+ self.assertIn(ICMPv6TimeExceeded, icmp)
+ self.assertIn(IPv6ExtHdrFragment, icmp)
+ self.assertIn(icmp[IPv6ExtHdrFragment].id, dropped_packet_indexes)
+ dropped_packet_indexes.remove(icmp[IPv6ExtHdrFragment].id)
+
+ def test_disabled(self):
+ """ reassembly disabled """
+
+ dropped_packet_indexes = set(
+ index for (index, frags_400, _) in self.pkt_infos
+ if len(frags_400) > 1)
+
+ self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=0,
+ expire_walk_interval_ms=10000, is_ip6=1)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(self.fragments_400)
+ self.pg_start()
+
+ packets = self.dst_if.get_capture(
+ len(self.pkt_infos) - len(dropped_packet_indexes))
+ self.verify_capture(packets, dropped_packet_indexes)
+ self.src_if.assert_nothing_captured()
+
+ def test_missing_upper(self):
+ """ missing upper layer """
+ p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IPv6(src=self.src_if.remote_ip6,
+ dst=self.src_if.local_ip6) /
+ UDP(sport=1234, dport=5678) /
+ Raw())
+ self.extend_packet(p, 1000, self.padding)
+ fragments = fragment_rfc8200(p, 1, 500)
+ bad_fragment = p.__class__(str(fragments[1]))
+ bad_fragment[IPv6ExtHdrFragment].nh = 59
+ bad_fragment[IPv6ExtHdrFragment].offset = 0
+ self.pg_enable_capture()
+ self.src_if.add_stream([bad_fragment])
+ self.pg_start()
+ pkts = self.src_if.get_capture(expected_count=1)
+ icmp = pkts[0]
+ self.assertIn(ICMPv6ParamProblem, icmp)
+ self.assert_equal(icmp[ICMPv6ParamProblem].code, 3, "ICMP code")
+
+ def test_invalid_frag_size(self):
+ """ fragment size not a multiple of 8 """
+ p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IPv6(src=self.src_if.remote_ip6,
+ dst=self.src_if.local_ip6) /
+ UDP(sport=1234, dport=5678) /
+ Raw())
+ self.extend_packet(p, 1000, self.padding)
+ fragments = fragment_rfc8200(p, 1, 500)
+ bad_fragment = fragments[0]
+ self.extend_packet(bad_fragment, len(bad_fragment) + 5)
+ self.pg_enable_capture()
+ self.src_if.add_stream([bad_fragment])
+ self.pg_start()
+ pkts = self.src_if.get_capture(expected_count=1)
+ icmp = pkts[0]
+ self.assertIn(ICMPv6ParamProblem, icmp)
+ self.assert_equal(icmp[ICMPv6ParamProblem].code, 0, "ICMP code")
+
+ def test_invalid_packet_size(self):
+ """ total packet size > 65535 """
+ p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IPv6(src=self.src_if.remote_ip6,
+ dst=self.src_if.local_ip6) /
+ UDP(sport=1234, dport=5678) /
+ Raw())
+ self.extend_packet(p, 1000, self.padding)
+ fragments = fragment_rfc8200(p, 1, 500)
+ bad_fragment = fragments[1]
+ bad_fragment[IPv6ExtHdrFragment].offset = 65500
+ self.pg_enable_capture()
+ self.src_if.add_stream([bad_fragment])
+ self.pg_start()
+ pkts = self.src_if.get_capture(expected_count=1)
+ icmp = pkts[0]
+ self.assertIn(ICMPv6ParamProblem, icmp)
+ self.assert_equal(icmp[ICMPv6ParamProblem].code, 0, "ICMP code")
+
+
+@unittest.skip("removing GRE tunnels broken, need fix")
+class TestFIFReassembly(VppTestCase):
+ """ Fragments in fragments reassembly """
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestFIFReassembly, cls).setUpClass()
+
+ cls.create_pg_interfaces([0, 1])
+ cls.src_if = cls.pg0
+ cls.dst_if = cls.pg1
+ for i in cls.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+ i.config_ip6()
+ i.resolve_ndp()
+
+ cls.packet_sizes = [64, 512, 1518, 9018]
+ cls.padding = " abcdefghijklmn"
+
+ def setUp(self):
+ """ Test setup - force timeout on existing reassemblies """
+ super(TestFIFReassembly, self).setUp()
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.src_if.sw_if_index, enable_ip4=True,
+ enable_ip6=True)
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.dst_if.sw_if_index, enable_ip4=True,
+ enable_ip6=True)
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10)
+ self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000,
+ expire_walk_interval_ms=10, is_ip6=1)
+ self.sleep(.25)
+ self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
+ expire_walk_interval_ms=10000)
+ self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000,
+ expire_walk_interval_ms=10000, is_ip6=1)
+
+ def tearDown(self):
+ self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
+ self.logger.debug(self.vapi.ppcli("show ip6-reassembly details"))
+ super(TestFIFReassembly, self).tearDown()
+
+ def verify_capture(self, capture, ip_class, dropped_packet_indexes=[]):
+ """Verify captured packet stream.
+
+ :param list capture: Captured packet stream.
+ """
+ info = None
+ seen = set()
+ for packet in capture:
+ try:
+ self.logger.debug(ppp("Got packet:", packet))
+ ip = packet[ip_class]
+ udp = packet[UDP]
+ payload_info = self.payload_to_info(str(packet[Raw]))
+ packet_index = payload_info.index
+ self.assertTrue(
+ packet_index not in dropped_packet_indexes,
+ ppp("Packet received, but should be dropped:", packet))
+ if packet_index in seen:
+ raise Exception(ppp("Duplicate packet received", packet))
+ seen.add(packet_index)
+ self.assertEqual(payload_info.dst, self.dst_if.sw_if_index)
+ info = self._packet_infos[packet_index]
+ self.assertTrue(info is not None)
+ self.assertEqual(packet_index, info.index)
+ saved_packet = info.data
+ self.assertEqual(ip.src, saved_packet[ip_class].src)
+ self.assertEqual(ip.dst, saved_packet[ip_class].dst)
+ self.assertEqual(udp.payload, saved_packet[UDP].payload)
+ except Exception:
+ self.logger.error(ppp("Unexpected or invalid packet:", packet))
+ raise
+ for index in self._packet_infos:
+ self.assertTrue(index in seen or index in dropped_packet_indexes,
+ "Packet with packet_index %d not received" % index)
+
+ def test_fif4(self):
+ """ Fragments in fragments (4o4) """
+
+ # TODO this should be ideally in setUpClass, but then we hit a bug
+ # with VppIpRoute incorrectly reporting it's present when it's not
+ # so we need to manually remove the vpp config, thus we cannot have
+ # it shared for multiple test cases
+ self.tun_ip4 = "1.1.1.2"
+
+ self.gre4 = VppGreInterface(self, self.src_if.local_ip4, self.tun_ip4)
+ self.gre4.add_vpp_config()
+ self.gre4.admin_up()
+ self.gre4.config_ip4()
+
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.gre4.sw_if_index, enable_ip4=True)
+
+ self.route4 = VppIpRoute(self, self.tun_ip4, 32,
+ [VppRoutePath(self.src_if.remote_ip4,
+ self.src_if.sw_if_index)])
+ self.route4.add_vpp_config()
+
+ self.reset_packet_infos()
+ for i in range(test_packet_count):
+ info = self.create_packet_info(self.src_if, self.dst_if)
+ payload = self.info_to_payload(info)
+ # Ethernet header here is only for size calculation, thus it
+ # doesn't matter how it's initialized. This is to ensure that
+ # reassembled packet is not > 9000 bytes, so that it's not dropped
+ p = (Ether() /
+ IP(id=i, src=self.src_if.remote_ip4,
+ dst=self.dst_if.remote_ip4) /
+ UDP(sport=1234, dport=5678) /
+ Raw(payload))
+ size = self.packet_sizes[(i // 2) % len(self.packet_sizes)]
+ self.extend_packet(p, size, self.padding)
+ info.data = p[IP] # use only IP part, without ethernet header
+
+ fragments = [x for _, p in self._packet_infos.iteritems()
+ for x in fragment_rfc791(p.data, 400)]
+
+ encapped_fragments = \
+ [Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IP(src=self.tun_ip4, dst=self.src_if.local_ip4) /
+ GRE() /
+ p
+ for p in fragments]
+
+ fragmented_encapped_fragments = \
+ [x for p in encapped_fragments
+ for x in fragment_rfc791(p, 200)]
+
+ self.src_if.add_stream(fragmented_encapped_fragments)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.src_if.assert_nothing_captured()
+ packets = self.dst_if.get_capture(len(self._packet_infos))
+ self.verify_capture(packets, IP)
+
+ # TODO remove gre vpp config by hand until VppIpRoute gets fixed
+ # so that it's query_vpp_config() works as it should
+ self.gre4.remove_vpp_config()
+ self.logger.debug(self.vapi.ppcli("show interface"))
+
+ def test_fif6(self):
+ """ Fragments in fragments (6o6) """
+ # TODO this should be ideally in setUpClass, but then we hit a bug
+ # with VppIpRoute incorrectly reporting it's present when it's not
+ # so we need to manually remove the vpp config, thus we cannot have
+ # it shared for multiple test cases
+ self.tun_ip6 = "1002::1"
+
+ self.gre6 = VppGre6Interface(self, self.src_if.local_ip6, self.tun_ip6)
+ self.gre6.add_vpp_config()
+ self.gre6.admin_up()
+ self.gre6.config_ip6()
+
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.gre6.sw_if_index, enable_ip6=True)
+
+ self.route6 = VppIpRoute(self, self.tun_ip6, 128,
+ [VppRoutePath(self.src_if.remote_ip6,
+ self.src_if.sw_if_index,
+ proto=DpoProto.DPO_PROTO_IP6)],
+ is_ip6=1)
+ self.route6.add_vpp_config()
+
+ self.reset_packet_infos()
+ for i in range(test_packet_count):
+ info = self.create_packet_info(self.src_if, self.dst_if)
+ payload = self.info_to_payload(info)
+ # Ethernet header here is only for size calculation, thus it
+ # doesn't matter how it's initialized. This is to ensure that
+ # reassembled packet is not > 9000 bytes, so that it's not dropped
+ p = (Ether() /
+ IPv6(src=self.src_if.remote_ip6, dst=self.dst_if.remote_ip6) /
+ UDP(sport=1234, dport=5678) /
+ Raw(payload))
+ size = self.packet_sizes[(i // 2) % len(self.packet_sizes)]
+ self.extend_packet(p, size, self.padding)
+ info.data = p[IPv6] # use only IPv6 part, without ethernet header
+
+ fragments = [x for _, i in self._packet_infos.iteritems()
+ for x in fragment_rfc8200(
+ i.data, i.index, 400)]
+
+ encapped_fragments = \
+ [Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
+ IPv6(src=self.tun_ip6, dst=self.src_if.local_ip6) /
+ GRE() /
+ p
+ for p in fragments]
+
+ fragmented_encapped_fragments = \
+ [x for p in encapped_fragments for x in (
+ fragment_rfc8200(
+ p,
+ 2 * len(self._packet_infos) + p[IPv6ExtHdrFragment].id,
+ 200)
+ if IPv6ExtHdrFragment in p else [p]
+ )
+ ]
+
+ self.src_if.add_stream(fragmented_encapped_fragments)
+
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.src_if.assert_nothing_captured()
+ packets = self.dst_if.get_capture(len(self._packet_infos))
+ self.verify_capture(packets, IPv6)
+
+ # TODO remove gre vpp config by hand until VppIpRoute gets fixed
+ # so that it's query_vpp_config() works as it should
+ # self.gre6.remove_vpp_config()
+
+
+if __name__ == '__main__':
+ unittest.main(testRunner=VppTestRunner)