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authorKlement Sekera <ksekera@cisco.com>2020-05-04 09:56:58 +0000
committerOle Trøan <otroan@employees.org>2020-05-13 11:39:30 +0000
commita3a830484fa6b6487f7f3d991a52cb6b090a8be8 (patch)
tree3b833401c46da712228b0c1194b9f6c3b80b0ffa /src/plugins/nat/test
parentbc752e432ff3e252f6e1a3f0372c9532f14909cd (diff)
nat: fix LRU blocked by inactive session
This fixes a situation where long-lived inactive session blocks LRU list. Solution is to have multiple LRU lists based on session type. This helps because session timeout is same for all sessions of same type. Type: fix Signed-off-by: Klement Sekera <ksekera@cisco.com> Change-Id: I5e54b2aab73b23911d6518d42e8c3f166c69a38c
Diffstat (limited to 'src/plugins/nat/test')
-rw-r--r--src/plugins/nat/test/test_nat.py105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/plugins/nat/test/test_nat.py b/src/plugins/nat/test/test_nat.py
index a8e2af763d0..2ba7a9b78f3 100644
--- a/src/plugins/nat/test/test_nat.py
+++ b/src/plugins/nat/test/test_nat.py
@@ -7059,6 +7059,111 @@ class TestNAT44EndpointDependent(MethodHolder):
self.logger.info(self.vapi.cli("show nat timeouts"))
+class TestNAT44EndpointDependent2(MethodHolder):
+ """ Endpoint-Dependent mapping and filtering extra test cases """
+
+ translation_buckets = 5
+
+ @classmethod
+ def setUpConstants(cls):
+ super(TestNAT44EndpointDependent2, cls).setUpConstants()
+ cls.vpp_cmdline.extend([
+ "nat", "{", "endpoint-dependent",
+ "translation hash buckets %d" % cls.translation_buckets,
+ "}"
+ ])
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestNAT44EndpointDependent2, cls).setUpClass()
+ cls.vapi.cli("set log class nat level debug")
+
+ cls.nat_addr = '10.0.0.3'
+
+ cls.create_pg_interfaces(range(2))
+
+ for i in cls.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+
+ def setUp(self):
+ super(TestNAT44EndpointDependent2, self).setUp()
+ self.vapi.nat_set_timeouts(
+ udp=1, tcp_established=7440, tcp_transitory=30, icmp=1)
+ self.nat44_add_address(self.nat_addr)
+ flags = self.config_flags.NAT_IS_INSIDE
+ self.vapi.nat44_interface_add_del_feature(
+ sw_if_index=self.pg0.sw_if_index, flags=flags, is_add=1)
+ self.vapi.nat44_interface_add_del_feature(
+ sw_if_index=self.pg1.sw_if_index, is_add=1)
+
+ @classmethod
+ def tearDownClass(cls):
+ super(TestNAT44EndpointDependent2, cls).tearDownClass()
+
+ def init_tcp_session(self, in_if, out_if, sport, ext_dport):
+ # SYN packet in->out
+ p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
+ IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
+ TCP(sport=sport, dport=ext_dport, flags="S"))
+ in_if.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = out_if.get_capture(1)
+ p = capture[0]
+ tcp_port_out = p[TCP].sport
+
+ # SYN + ACK packet out->in
+ p = (Ether(src=out_if.remote_mac, dst=out_if.local_mac) /
+ IP(src=out_if.remote_ip4, dst=self.nat_addr) /
+ TCP(sport=ext_dport, dport=tcp_port_out, flags="SA"))
+ out_if.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ in_if.get_capture(1)
+
+ # ACK packet in->out
+ p = (Ether(src=in_if.remote_mac, dst=in_if.local_mac) /
+ IP(src=in_if.remote_ip4, dst=out_if.remote_ip4) /
+ TCP(sport=sport, dport=ext_dport, flags="A"))
+ in_if.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ out_if.get_capture(1)
+
+ return tcp_port_out
+
+ def test_lru_cleanup(self):
+ """ LRU cleanup algorithm """
+ tcp_port_out = self.init_tcp_session(self.pg0, self.pg1, 2000, 80)
+ max_translations = 10 * self.translation_buckets
+ pkts = []
+ for i in range(0, max_translations - 1):
+ p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
+ UDP(sport=7000+i, dport=80))
+ pkts.append(p)
+
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ self.pg1.get_capture(len(pkts))
+ self.sleep(1.5, "wait for timeouts")
+
+ pkts = []
+ for i in range(0, max_translations - 1):
+ p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, ttl=64) /
+ ICMP(id=8000+i, type='echo-request'))
+ pkts.append(p)
+
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ self.pg1.get_capture(len(pkts))
+
+
class TestNAT44Out2InDPO(MethodHolder):
""" NAT44 Test Cases using out2in DPO """