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-rw-r--r--test/test_snat.py67
1 files changed, 67 insertions, 0 deletions
diff --git a/test/test_snat.py b/test/test_snat.py
index e90d9c0b71d..5cc76f6c7da 100644
--- a/test/test_snat.py
+++ b/test/test_snat.py
@@ -34,6 +34,9 @@ class TestSNAT(VppTestCase):
i.config_ip4()
i.resolve_arp()
+ cls.pg0.generate_remote_hosts(2)
+ cls.pg0.configure_ipv4_neighbors()
+
cls.overlapping_interfaces = list(list(cls.pg_interfaces[4:7]))
for i in cls.overlapping_interfaces:
@@ -526,6 +529,70 @@ class TestSNAT(VppTestCase):
capture = self.pg6.get_capture()
self.verify_capture_in(capture, self.pg6)
+ def test_hairpinning(self):
+ """ SNAT hairpinning """
+
+ host = self.pg0.remote_hosts[0]
+ server = self.pg0.remote_hosts[1]
+ host_in_port = 1234
+ host_out_port = 0
+ server_in_port = 5678
+ server_out_port = 8765
+
+ self.snat_add_address(self.snat_addr)
+ self.vapi.snat_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.snat_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+ # add static mapping for server
+ self.snat_add_static_mapping(server.ip4, self.snat_addr,
+ server_in_port, server_out_port)
+
+ # send packet from host to server
+ p = (Ether(src=host.mac, dst=self.pg0.local_mac) /
+ IP(src=host.ip4, dst=self.snat_addr) /
+ TCP(sport=host_in_port, dport=server_out_port))
+ self.pg0.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture()
+ self.assertEqual(1, len(capture))
+ p = capture[0]
+ try:
+ ip = p[IP]
+ tcp = p[TCP]
+ self.assertEqual(ip.src, self.snat_addr)
+ self.assertEqual(ip.dst, server.ip4)
+ self.assertNotEqual(tcp.sport, host_in_port)
+ self.assertEqual(tcp.dport, server_in_port)
+ host_out_port = tcp.sport
+ except:
+ error("Unexpected or invalid packet:")
+ error(p.show())
+ raise
+
+ # send reply from server to host
+ p = (Ether(src=server.mac, dst=self.pg0.local_mac) /
+ IP(src=server.ip4, dst=self.snat_addr) /
+ TCP(sport=server_in_port, dport=host_out_port))
+ self.pg0.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture()
+ self.assertEqual(1, len(capture))
+ p = capture[0]
+ try:
+ ip = p[IP]
+ tcp = p[TCP]
+ self.assertEqual(ip.src, self.snat_addr)
+ self.assertEqual(ip.dst, host.ip4)
+ self.assertEqual(tcp.sport, server_out_port)
+ self.assertEqual(tcp.dport, host_in_port)
+ except:
+ error("Unexpected or invalid packet:")
+ error(p.show())
+ raise
+
+
def tearDown(self):
super(TestSNAT, self).tearDown()
if not self.vpp_dead: