#!/usr/bin/env python import six import unittest from random import shuffle from framework import VppTestCase, VppTestRunner import scapy.compat from scapy.packet import Raw from scapy.layers.l2 import Ether, GRE from scapy.layers.inet import IP, UDP, ICMP from util import ppp, fragment_rfc791, fragment_rfc8200 from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, ICMPv6ParamProblem,\ ICMPv6TimeExceeded from framework import VppTestCase, VppTestRunner from util import ppp, fragment_rfc791, fragment_rfc8200 from vpp_gre_interface import VppGreInterface from vpp_ip import DpoProto from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto # 35 is enough to have >257 400-byte fragments test_packet_count = 35 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() @classmethod def tearDownClass(cls): super(TestIPv4Reassembly, cls).tearDownClass() 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, max_reassembly_length=1000, expire_walk_interval_ms=10) self.sleep(.25) self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10000) def tearDown(self): super(TestIPv4Reassembly, self).tearDown() def show_commands_at_teardown(self): self.logger.debug(self.vapi.ppcli("show ip4-reassembly details")) self.logger.debug(self.vapi.ppcli("show buffers")) @classmethod def create_stream(cls, packet_sizes, packet_count=test_packet_count): """Create input packet stream :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 six.iteritems(infos): p = info.data # cls.logger.debug(ppp("Packet:", # p.__class__(scapy.compat.raw(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(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_long_fragment_chain(self): """ long fragment chain """ error_cnt_str = \ "/err/ip4-reassembly-feature/fragment chain too long (drop)" error_cnt = self.statistics.get_err_counter(error_cnt_str) self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000, max_reassembly_length=3, expire_walk_interval_ms=50) p1 = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=1000, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / UDP(sport=1234, dport=5678) / Raw("X" * 1000)) p2 = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=1001, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / UDP(sport=1234, dport=5678) / Raw("X" * 1000)) frags = fragment_rfc791(p1, 200) + fragment_rfc791(p2, 500) self.pg_enable_capture() self.src_if.add_stream(frags) self.pg_start() self.dst_if.get_capture(1) self.assert_error_counter_equal(error_cnt_str, error_cnt + 1) def test_5737(self): """ fragment length + ip header size > 65535 """ self.vapi.cli("clear errors") raw = ('E\x00\x00\x88,\xf8\x1f\xfe@\x01\x98\x00\xc0\xa8\n-\xc0\xa8\n' '\x01\x08\x00\xf0J\xed\xcb\xf1\xf5Test-group: IPv4.IPv4.ipv4-' 'message.Ethernet-Payload.IPv4-Packet.IPv4-Header.Fragment-Of' 'fset; Test-case: 5737') malformed_packet = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(raw)) p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=1000, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / UDP(sport=1234, dport=5678) / Raw("X" * 1000)) valid_fragments = fragment_rfc791(p, 400) self.pg_enable_capture() self.src_if.add_stream([malformed_packet] + valid_fragments) self.pg_start() self.dst_if.get_capture(1) self.assert_packet_counter_equal("ip4-reassembly-feature", 1) # TODO remove above, uncomment below once clearing of counters # is supported # self.assert_packet_counter_equal( # "/err/ip4-reassembly-feature/malformed packets", 1) def test_44924(self): """ compress tiny fragments """ packets = [(Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=24339, flags="MF", frag=0, ttl=64, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) / Raw(load='Test-group: IPv4')), (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=24339, flags="MF", frag=3, ttl=64, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) / Raw(load='.IPv4.Fragmentation.vali')), (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=24339, frag=6, ttl=64, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / ICMP(type="echo-request", code=0, id=0x1fe6, seq=0x2407) / Raw(load='d; Test-case: 44924')) ] self.pg_enable_capture() self.src_if.add_stream(packets) self.pg_start() self.dst_if.get_capture(1) def test_frag_1(self): """ fragment of size 1 """ self.vapi.cli("clear errors") malformed_packets = [(Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=7, len=21, flags="MF", frag=0, ttl=64, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / ICMP(type="echo-request")), (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=7, len=21, frag=1, ttl=64, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / Raw(load='\x08')), ] p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IP(id=1000, src=self.src_if.remote_ip4, dst=self.dst_if.remote_ip4) / UDP(sport=1234, dport=5678) / Raw("X" * 1000)) valid_fragments = fragment_rfc791(p, 400) self.pg_enable_capture() self.src_if.add_stream(malformed_packets + valid_fragments) self.pg_start() self.dst_if.get_capture(1) self.assert_packet_counter_equal("ip4-reassembly-feature", 1) # TODO remove above, uncomment below once clearing of counters # is supported # self.assert_packet_counter_equal( # "/err/ip4-reassembly-feature/malformed packets", 1) 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: fragments.extend(i) fragments.extend(j) fragments.pop() 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, max_reassembly_length=3, 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, max_reassembly_length=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, max_reassembly_length=3, 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() @classmethod def tearDownClass(cls): super(TestIPv6Reassembly, cls).tearDownClass() 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, max_reassembly_length=1000, expire_walk_interval_ms=10, is_ip6=1) self.sleep(.25) self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10000, is_ip6=1) self.logger.debug(self.vapi.ppcli("show ip6-reassembly details")) self.logger.debug(self.vapi.ppcli("show buffers")) def tearDown(self): super(TestIPv6Reassembly, self).tearDown() def show_commands_at_teardown(self): self.logger.debug(self.vapi.ppcli("show ip6-reassembly details")) self.logger.debug(self.vapi.ppcli("show buffers")) @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 six.iteritems(infos): p = info.data # cls.logger.debug(ppp("Packet:", # p.__class__(scapy.compat.raw(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(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_long_fragment_chain(self): """ long fragment chain """ error_cnt_str = \ "/err/ip6-reassembly-feature/fragment chain too long (drop)" error_cnt = self.statistics.get_err_counter(error_cnt_str) self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000, max_reassembly_length=3, expire_walk_interval_ms=50, is_ip6=1) p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) / IPv6(src=self.src_if.remote_ip6, dst=self.dst_if.remote_ip6) / UDP(sport=1234, dport=5678) / Raw("X" * 1000)) frags = fragment_rfc8200(p, 1, 300) + fragment_rfc8200(p, 2, 500) self.pg_enable_capture() self.src_if.add_stream(frags) self.pg_start() self.dst_if.get_capture(1) self.assert_error_counter_equal(error_cnt_str, error_cnt + 1) 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: fragments.extend(i) fragments.extend(j) fragments.pop() 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, max_reassembly_length=3, 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, max_reassembly_length=1000, expire_walk_interval_ms=50) self.vapi.ip_reassembly_set(timeout_ms=100, max_reassemblies=1000, max_reassembly_length=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, max_reassembly_length=3, 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__(scapy.compat.raw(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") class TestIPv4ReassemblyLocalNode(VppTestCase): """ IPv4 Reassembly for packets coming to ip4-local node """ @classmethod def setUpClass(cls): super(TestIPv4ReassemblyLocalNode, cls).setUpClass() cls.create_pg_interfaces([0]) cls.src_dst_if = cls.pg0 # setup all interfaces for i in cls.pg_interfaces: i.admin_up() i.config_ip4() i.resolve_arp() cls.padding = " abcdefghijklmn" cls.create_stream() cls.create_fragments() @classmethod def tearDownClass(cls): super(TestIPv4ReassemblyLocalNode, cls).tearDownClass() def setUp(self): """ Test setup - force timeout on existing reassemblies """ super(TestIPv4ReassemblyLocalNode, self).setUp() self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10) self.sleep(.25) self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10000) def tearDown(self): super(TestIPv4ReassemblyLocalNode, self).tearDown() def show_commands_at_teardown(self): self.logger.debug(self.vapi.ppcli("show ip4-reassembly details")) self.logger.debug(self.vapi.ppcli("show buffers")) @classmethod def create_stream(cls, 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_dst_if, cls.src_dst_if) payload = cls.info_to_payload(info) p = (Ether(dst=cls.src_dst_if.local_mac, src=cls.src_dst_if.remote_mac) / IP(id=info.index, src=cls.src_dst_if.remote_ip4, dst=cls.src_dst_if.local_ip4) / ICMP(type='echo-request', id=1234) / Raw(payload)) cls.extend_packet(p, 1518, cls.padding) info.data = p @classmethod def create_fragments(cls): infos = cls._packet_infos cls.pkt_infos = [] for index, info in six.iteritems(infos): p = info.data # cls.logger.debug(ppp("Packet:", # p.__class__(scapy.compat.raw(p)))) fragments_300 = fragment_rfc791(p, 300) cls.pkt_infos.append((index, fragments_300)) cls.fragments_300 = [x for (_, frags) in cls.pkt_infos for x in frags] cls.logger.debug("Fragmented %s packets into %s 300-byte fragments" % (len(infos), len(cls.fragments_300))) def verify_capture(self, capture): """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] icmp = packet[ICMP] payload_info = self.payload_to_info(packet[Raw]) packet_index = payload_info.index if packet_index in seen: raise Exception(ppp("Duplicate packet received", packet)) seen.add(packet_index) self.assertEqual(payload_info.dst, self.src_dst_if.sw_if_index) info = self._packet_infos[packet_index] self.assertIsNotNone(info) self.assertEqual(packet_index, info.index) saved_packet = info.data self.assertEqual(ip.src, saved_packet[IP].dst) self.assertEqual(ip.dst, saved_packet[IP].src) self.assertEqual(icmp.type, 0) # echo reply self.assertEqual(icmp.id, saved_packet[ICMP].id) self.assertEqual(icmp.payload, saved_packet[ICMP].payload) except Exception: self.logger.error(ppp("Unexpected or invalid packet:", packet)) raise for index in self._packet_infos: self.assertIn(index, seen, "Packet with packet_index %d not received" % index) def test_reassembly(self): """ basic reassembly """ self.pg_enable_capture() self.src_dst_if.add_stream(self.fragments_300) self.pg_start() packets = self.src_dst_if.get_capture(len(self.pkt_infos)) self.verify_capture(packets) # run it all again to verify correctness self.pg_enable_capture() self.src_dst_if.add_stream(self.fragments_300) self.pg_start() packets = self.src_dst_if.get_capture(len(self.pkt_infos)) self.verify_capture(packets) 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" @classmethod def tearDownClass(cls): super(TestFIFReassembly, cls).tearDownClass() 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, max_reassembly_length=1000, expire_walk_interval_ms=10) self.vapi.ip_reassembly_set(timeout_ms=0, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10, is_ip6=1) self.sleep(.25) self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10000) self.vapi.ip_reassembly_set(timeout_ms=1000000, max_reassemblies=1000, max_reassembly_length=1000, expire_walk_interval_ms=10000, is_ip6=1) def tearDown(self): super(TestFIFReassembly, self).tearDown() def show_commands_at_teardown(self): self.logger.debug(self.vapi.ppcli("show ip4-reassembly details")) self.logger.debug(self.vapi.ppcli("show ip6-reassembly details")) self.logger.debug(self.vapi.ppcli("show buffers")) 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(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 six.iteritems(self._packet_infos) 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 = VppGreInterface(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)]) 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 six.iteritems(self._packet_infos) 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)