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Diffstat (limited to 'test/test_reassembly.py')
| -rw-r--r-- | test/test_reassembly.py | 972 |
1 files changed, 972 insertions, 0 deletions
diff --git a/test/test_reassembly.py b/test/test_reassembly.py new file mode 100644 index 00000000000..531caa46257 --- /dev/null +++ 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) |