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test_reassembly.py
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#!/usr/bin/env python3
import six
import unittest
from random import shuffle, choice, randrange
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 scapy.layers.inet6 import HBHOptUnknown, ICMPv6ParamProblem,\
ICMPv6TimeExceeded, IPv6, IPv6ExtHdrFragment, IPv6ExtHdrHopByHop
from framework import VppTestCase, VppTestRunner
from util import ppp, ppc, fragment_rfc791, fragment_rfc8200
from vpp_gre_interface import VppGreInterface
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto
from vpp_papi import VppEnum
# 35 is enough to have >257 400-byte fragments
test_packet_count = 35
# number of workers used for multi-worker test cases
worker_count = 3
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-full-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-full-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(b"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(b"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 = b'''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-Offset; 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(b"X" * 1000))
valid_fragments = fragment_rfc791(p, 400)
counter = "/err/ip4-full-reassembly-feature/malformed packets"
error_counter = self.statistics.get_err_counter(counter)
self.pg_enable_capture()
self.src_if.add_stream([malformed_packet] + valid_fragments)
self.pg_start()
self.dst_if.get_capture(1)
self.logger.debug(self.vapi.ppcli("show error"))
self.assertEqual(self.statistics.get_err_counter(counter),
error_counter + 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=b'\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(b"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-full-reassembly-feature", 1)
# TODO remove above, uncomment below once clearing of counters
# is supported
# self.assert_packet_counter_equal(
# "/err/ip4-full-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 TestIPv4SVReassembly(VppTestCase):
""" IPv4 Shallow Virtual Reassembly """
@classmethod
def setUpClass(cls):
super(TestIPv4SVReassembly, 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()
def setUp(self):
""" Test setup - force timeout on existing reassemblies """
super(TestIPv4SVReassembly, self).setUp()
self.vapi.ip_reassembly_enable_disable(
sw_if_index=self.src_if.sw_if_index, enable_ip4=True,
type=VppEnum.vl_api_ip_reass_type_t.IP_REASS_TYPE_SHALLOW_VIRTUAL)
self.vapi.ip_reassembly_set(
timeout_ms=0, max_reassemblies=1000,
max_reassembly_length=1000,
type=VppEnum.vl_api_ip_reass_type_t.IP_REASS_TYPE_SHALLOW_VIRTUAL,
expire_walk_interval_ms=10)
self.sleep(.25)
self.vapi.ip_reassembly_set(
timeout_ms=1000000, max_reassemblies=1000,
max_reassembly_length=1000,
type=VppEnum.vl_api_ip_reass_type_t.IP_REASS_TYPE_SHALLOW_VIRTUAL,
expire_walk_interval_ms=10000)
def tearDown(self):
super(TestIPv4SVReassembly, self).tearDown()
self.logger.debug(self.vapi.ppcli("show ip4-sv-reassembly details"))
self.logger.debug(self.vapi.ppcli("show buffers"))
def test_basic(self):
""" basic reassembly """
payload_len = 1000
payload = ""
counter = 0
while len(payload) < payload_len:
payload += "%u " % counter
counter += 1
p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
IP(id=1, src=self.src_if.remote_ip4,
dst=self.dst_if.remote_ip4) /
UDP(sport=1234, dport=5678) /
Raw(payload))
fragments = fragment_rfc791(p, payload_len/4)
# send fragment #2 - should be cached inside reassembly
self.pg_enable_capture()
self.src_if.add_stream(fragments[1])
self.pg_start()
self.logger.debug(self.vapi.ppcli("show ip4-sv-reassembly details"))
self.logger.debug(self.vapi.ppcli("show buffers"))
self.logger.debug(self.vapi.ppcli("show trace"))
self.dst_if.assert_nothing_captured()
# send fragment #1 - reassembly is finished now and both fragments
# forwarded
self.pg_enable_capture()
self.src_if.add_stream(fragments[0])
self.pg_start()
self.logger.debug(self.vapi.ppcli("show ip4-sv-reassembly details"))
self.logger.debug(self.vapi.ppcli("show buffers"))
self.logger.debug(self.vapi.ppcli("show trace"))
c = self.dst_if.get_capture(2)
for sent, recvd in zip([fragments[1], fragments[0]], c):
self.assertEqual(sent[IP].src, recvd[IP].src)
self.assertEqual(sent[IP].dst, recvd[IP].dst)
self.assertEqual(sent[Raw].payload, recvd[Raw].payload)
# send rest of fragments - should be immediately forwarded
self.pg_enable_capture()
self.src_if.add_stream(fragments[2:])
self.pg_start()
c = self.dst_if.get_capture(len(fragments[2:]))
for sent, recvd in zip(fragments[2:], c):
self.assertEqual(sent[IP].src, recvd[IP].src)
self.assertEqual(sent[IP].dst, recvd[IP].dst)
self.assertEqual(sent[Raw].payload, recvd[Raw].payload)
def test_timeout(self):
""" reassembly timeout """
payload_len = 1000
payload = ""
counter = 0
while len(payload) < payload_len:
payload += "%u " % counter
counter += 1
p = (Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac) /
IP(id=1, src=self.src_if.remote_ip4,
dst=self.dst_if.remote_ip4) /
UDP(sport=1234, dport=5678) /
Raw(payload))
fragments = fragment_rfc791(p, payload_len/4)
self.vapi.ip_reassembly_set(
timeout_ms=100, max_reassemblies=1000,
max_reassembly_length=1000,
expire_walk_interval_ms=50,
type=VppEnum.vl_api_ip_reass_type_t.IP_REASS_TYPE_SHALLOW_VIRTUAL)
# send fragments #2 and #1 - should be forwarded
self.pg_enable_capture()
self.src_if.add_stream(fragments[0:2])
self.pg_start()
self.logger.debug(self.vapi.ppcli("show ip4-sv-reassembly details"))
self.logger.debug(self.vapi.ppcli("show buffers"))
self.logger.debug(self.vapi.ppcli("show trace"))
c = self.dst_if.get_capture(2)
for sent, recvd in zip([fragments[1], fragments[0]], c):
self.assertEqual(sent[IP].src, recvd[IP].src)
self.assertEqual(sent[IP].dst, recvd[IP].dst)
self.assertEqual(sent[Raw].payload, recvd[Raw].payload)
# wait for cleanup
self.sleep(.25, "wait before sending rest of fragments")
# send rest of fragments - shouldn't be forwarded
self.pg_enable_capture()
self.src_if.add_stream(fragments[2:])
self.pg_start()
self.dst_if.assert_nothing_captured()
def test_lru(self):
""" reassembly reuses LRU element """
self.vapi.ip_reassembly_set(
timeout_ms=1000000, max_reassemblies=1,
max_reassembly_length=1000,
type=VppEnum.vl_api_ip_reass_type_t.IP_REASS_TYPE_SHALLOW_VIRTUAL,
expire_walk_interval_ms=10000)
payload_len = 1000
payload = ""
counter = 0
while len(payload) < payload_len:
payload += "%u " % counter
counter += 1
packet_count = 10
fragments = [f
for i in range(packet_count)
for p in (Ether(dst=self.src_if.local_mac,
src=self.src_if.remote_mac) /
IP(id=i, src=self.src_if.remote_ip4,
dst=self.dst_if.remote_ip4) /
UDP(sport=1234, dport=5678) /
Raw(payload))
for f in fragment_rfc791(p, payload_len/4)]
self.pg_enable_capture()
self.src_if.add_stream(fragments)
self.pg_start()
c = self.dst_if.get_capture(len(fragments))
for sent, recvd in zip(fragments, c):
self.assertEqual(sent[IP].src, recvd[IP].src)
self.assertEqual(sent[IP].dst, recvd[IP].dst)
self.assertEqual(sent[Raw].payload, recvd[Raw].payload)
class TestIPv4MWReassembly(VppTestCase):
""" IPv4 Reassembly (multiple workers) """
worker_config = "workers %d" % worker_count
@classmethod
def setUpClass(cls):
super(TestIPv4MWReassembly, cls).setUpClass()
cls.create_pg_interfaces(range(worker_count+1))
cls.src_if = cls.pg0
cls.send_ifs = cls.pg_interfaces[:-1]
cls.dst_if = cls.pg_interfaces[-1]
# setup all interfaces
for i in cls.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
# packets sizes reduced here because we are generating packets without
# Ethernet headers, which are added later (diff fragments go via
# different interfaces)
cls.packet_sizes = [64-len(Ether()), 512-len(Ether()),
1518-len(Ether()), 9018-len(Ether())]
cls.padding = " abcdefghijklmn"
cls.create_stream(cls.packet_sizes)
cls.create_fragments()
@classmethod
def tearDownClass(cls):
super(TestIPv4MWReassembly, cls).tearDownClass()
def setUp(self):
""" Test setup - force timeout on existing reassemblies """
super(TestIPv4MWReassembly, self).setUp()
for intf in self.send_ifs:
self.vapi.ip_reassembly_enable_disable(
sw_if_index=intf.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(TestIPv4MWReassembly, self).tearDown()
def show_commands_at_teardown(self):
self.logger.debug(self.vapi.ppcli("show ip4-full-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 = (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)
cls.pkt_infos.append((index, fragments_400))
cls.fragments_400 = [
x for (_, frags) in cls.pkt_infos for x in frags]
cls.logger.debug("Fragmented %s packets into %s 400-byte fragments, " %
(len(infos), len(cls.fragments_400)))
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 send_packets(self, packets):
for counter in range(worker_count):
if 0 == len(packets[counter]):
continue
send_if = self.send_ifs[counter]
send_if.add_stream(
(Ether(dst=send_if.local_mac, src=send_if.remote_mac) / x
for x in packets[counter]),
worker=counter)
self.pg_start()
def test_worker_conflict(self):
""" 1st and FO=0 fragments on different workers """
# in first wave we send fragments which don't start at offset 0
# then we send fragments with offset 0 on a different thread
# then the rest of packets on a random thread
first_packets = [[] for n in range(worker_count)]
second_packets = [[] for n in range(worker_count)]
rest_of_packets = [[] for n in range(worker_count)]
for (_, p) in self.pkt_infos:
wi = randrange(worker_count)
second_packets[wi].append(p[0])
if len(p) <= 1:
continue
wi2 = wi
while wi2 == wi:
wi2 = randrange(worker_count)
first_packets[wi2].append(p[1])
wi3 = randrange(worker_count)
rest_of_packets[wi3].extend(p[2:])
self.pg_enable_capture()
self.send_packets(first_packets)
self.send_packets(second_packets)
self.send_packets(rest_of_packets)
packets = self.dst_if.get_capture(len(self.pkt_infos))
self.verify_capture(packets)
for send_if in self.send_ifs:
send_if.assert_nothing_captured()
self.logger.debug(self.vapi.ppcli("show trace"))
self.logger.debug(self.vapi.ppcli("show ip4-full-reassembly details"))
self.logger.debug(self.vapi.ppcli("show buffers"))
self.vapi.cli("clear trace")
self.pg_enable_capture()
self.send_packets(first_packets)
self.send_packets(second_packets)
self.send_packets(rest_of_packets)
packets = self.dst_if.get_capture(len(self.pkt_infos))
self.verify_capture(packets)
for send_if in self.send_ifs:
send_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-full-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-full-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_buffer_boundary(self):
""" fragment header crossing buffer boundary """
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) /
IPv6ExtHdrHopByHop(