diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/test_snat.py | 67 |
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: |