+ def test_local_enable_disable(self):
+ """local reassembly enabled/disable"""
+ self.vapi.ip_reassembly_enable_disable(
+ sw_if_index=self.src_if.sw_if_index, enable_ip4=False
+ )
+ self.vapi.ip_local_reass_enable_disable(enable_ip4=True)
+ p = (
+ Ether(src=self.src_if.remote_mac, dst=self.src_if.local_mac)
+ / IP(src=self.src_if.remote_ip4, dst=self.src_if.local_ip4)
+ / ICMP(id=1234, type="echo-request")
+ / Raw("x" * 1000)
+ )
+ frags = fragment_rfc791(p, 400)
+ r = self.send_and_expect(self.src_if, frags, self.src_if, n_rx=1)[0]
+ self.assertEqual(1234, r[ICMP].id)
+ self.assertEqual(icmptypes[r[ICMP].type], "echo-reply")
+ self.vapi.ip_local_reass_enable_disable()
+
+ self.send_and_assert_no_replies(self.src_if, frags)
+ self.vapi.ip_local_reass_enable_disable(enable_ip4=True)
+
+
+class TestIPv4SVReassembly(VppTestCase):
+ """IPv4 Shallow Virtual Reassembly"""
+
+ @classmethod
+ def setUpClass(cls):
+ super().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().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.virtual_sleep(0.25)
+ 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().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_verify_clear_trace_mid_reassembly(self):
+ """verify clear trace works mid-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)
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments[1])
+ self.pg_start()
+
+ self.logger.debug(self.vapi.cli("show trace"))
+ self.vapi.cli("clear trace")
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments[0])
+ self.pg_start()
+ self.dst_if.get_capture(2)
+
+ self.logger.debug(self.vapi.cli("show trace"))
+ self.vapi.cli("clear trace")
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(fragments[2:])
+ self.pg_start()
+ self.dst_if.get_capture(len(fragments[2:]))
+
+ 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.virtual_sleep(0.25, "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)
+
+ def send_mixed_and_verify_capture(self, traffic):
+ stream = []
+ for t in traffic:
+ for c in range(t["count"]):
+ stream.append(
+ (
+ Ether(dst=self.src_if.local_mac, src=self.src_if.remote_mac)
+ / IP(
+ id=self.counter,
+ flags=t["flags"],
+ src=self.src_if.remote_ip4,
+ dst=self.dst_if.remote_ip4,
+ )
+ / UDP(sport=1234, dport=5678)
+ / Raw("abcdef")
+ )
+ )
+ self.counter = self.counter + 1
+
+ self.pg_enable_capture()
+ self.src_if.add_stream(stream)
+ 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.get_capture(len(stream))
+
+ def test_mixed(self):
+ """mixed traffic correctly passes through SVR"""
+ self.counter = 1
+
+ self.send_mixed_and_verify_capture([{"count": 1, "flags": ""}])
+ self.send_mixed_and_verify_capture([{"count": 2, "flags": ""}])
+ self.send_mixed_and_verify_capture([{"count": 3, "flags": ""}])
+ self.send_mixed_and_verify_capture([{"count": 8, "flags": ""}])
+ self.send_mixed_and_verify_capture([{"count": 257, "flags": ""}])
+
+ self.send_mixed_and_verify_capture([{"count": 1, "flags": "MF"}])
+ self.send_mixed_and_verify_capture([{"count": 2, "flags": "MF"}])
+ self.send_mixed_and_verify_capture([{"count": 3, "flags": "MF"}])
+ self.send_mixed_and_verify_capture([{"count": 8, "flags": "MF"}])
+ self.send_mixed_and_verify_capture([{"count": 257, "flags": "MF"}])
+
+ self.send_mixed_and_verify_capture(
+ [{"count": 1, "flags": ""}, {"count": 1, "flags": "MF"}]
+ )
+ self.send_mixed_and_verify_capture(
+ [{"count": 2, "flags": ""}, {"count": 2, "flags": "MF"}]
+ )
+ self.send_mixed_and_verify_capture(
+ [{"count": 3, "flags": ""}, {"count": 3, "flags": "MF"}]
+ )
+ self.send_mixed_and_verify_capture(
+ [{"count": 8, "flags": ""}, {"count": 8, "flags": "MF"}]
+ )
+ self.send_mixed_and_verify_capture(
+ [{"count": 129, "flags": ""}, {"count": 129, "flags": "MF"}]
+ )
+
+ self.send_mixed_and_verify_capture(
+ [
+ {"count": 1, "flags": ""},
+ {"count": 1, "flags": "MF"},
+ {"count": 1, "flags": ""},
+ {"count": 1, "flags": "MF"},
+ ]
+ )
+ self.send_mixed_and_verify_capture(
+ [
+ {"count": 2, "flags": ""},
+ {"count": 2, "flags": "MF"},
+ {"count": 2, "flags": ""},
+ {"count": 2, "flags": "MF"},
+ ]
+ )
+ self.send_mixed_and_verify_capture(
+ [
+ {"count": 3, "flags": ""},
+ {"count": 3, "flags": "MF"},
+ {"count": 3, "flags": ""},
+ {"count": 3, "flags": "MF"},
+ ]
+ )
+ self.send_mixed_and_verify_capture(
+ [
+ {"count": 8, "flags": ""},
+ {"count": 8, "flags": "MF"},
+ {"count": 8, "flags": ""},
+ {"count": 8, "flags": "MF"},
+ ]
+ )
+ self.send_mixed_and_verify_capture(
+ [
+ {"count": 65, "flags": ""},
+ {"count": 65, "flags": "MF"},
+ {"count": 65, "flags": ""},
+ {"count": 65, "flags": "MF"},
+ ]
+ )
+