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authorJuraj Sloboda <jsloboda@cisco.com>2018-10-02 11:13:53 +0200
committerFlorin Coras <florin.coras@gmail.com>2018-10-04 17:55:10 +0000
commit3048b63de968ef616baf14e1abbb6502bd4fdcbc (patch)
treec505c1cd8bfb30b073148bf4e7a4836f3e823447 /test/test_reassembly.py
parent6f40a8a4c5792c5c5e5c77366e98b1f10370d685 (diff)
Support reassembly for fragments coming to ip4-local node
Change-Id: I3aa4708c1c3cdda344f282d56b617677080eaaa1 Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>
Diffstat (limited to 'test/test_reassembly.py')
-rw-r--r--test/test_reassembly.py119
1 files changed, 118 insertions, 1 deletions
diff --git a/test/test_reassembly.py b/test/test_reassembly.py
index b2c271decac..d7cc627a318 100644
--- a/test/test_reassembly.py
+++ b/test/test_reassembly.py
@@ -6,7 +6,7 @@ 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 scapy.layers.inet import IP, UDP, ICMP
from util import ppp, fragment_rfc791, fragment_rfc8200
from scapy.layers.inet6 import IPv6, IPv6ExtHdrFragment, ICMPv6ParamProblem,\
ICMPv6TimeExceeded
@@ -750,6 +750,123 @@ class TestIPv6Reassembly(VppTestCase):
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()
+
+ 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,
+ 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(TestIPv4ReassemblyLocalNode, self).tearDown()
+ self.logger.debug(self.vapi.ppcli("show ip4-reassembly details"))
+
+ @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 infos.iteritems():
+ p = info.data
+ # cls.logger.debug(ppp("Packet:", p.__class__(str(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(str(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.assertTrue(info is not None)
+ 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.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_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 """