+ def test_set_get_reass(self):
+ """ NAT44 set/get virtual fragmentation reassembly """
+ reas_cfg1 = self.vapi.nat_get_reass()
+
+ self.vapi.nat_set_reass(timeout=reas_cfg1.ip4_timeout + 5,
+ max_reass=reas_cfg1.ip4_max_reass * 2,
+ max_frag=reas_cfg1.ip4_max_frag * 2)
+
+ reas_cfg2 = self.vapi.nat_get_reass()
+
+ self.assertEqual(reas_cfg1.ip4_timeout + 5, reas_cfg2.ip4_timeout)
+ self.assertEqual(reas_cfg1.ip4_max_reass * 2, reas_cfg2.ip4_max_reass)
+ self.assertEqual(reas_cfg1.ip4_max_frag * 2, reas_cfg2.ip4_max_frag)
+
+ self.vapi.nat_set_reass(drop_frag=1)
+ self.assertTrue(self.vapi.nat_get_reass().ip4_drop_frag)
+
+ def test_frag_in_order(self):
+ """ NAT44 translate fragments arriving in order """
+ self.nat44_add_address(self.nat_addr)
+ self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+
+ data = "A" * 4 + "B" * 16 + "C" * 3
+ self.tcp_port_in = random.randint(1025, 65535)
+
+ reass = self.vapi.nat_reass_dump()
+ reass_n_start = len(reass)
+
+ # in2out
+ pkts = self.create_stream_frag(self.pg0,
+ self.pg1.remote_ip4,
+ self.tcp_port_in,
+ 20,
+ data)
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ frags = self.pg1.get_capture(len(pkts))
+ p = self.reass_frags_and_verify(frags,
+ self.nat_addr,
+ self.pg1.remote_ip4)
+ self.assertEqual(p[TCP].dport, 20)
+ self.assertNotEqual(p[TCP].sport, self.tcp_port_in)
+ self.tcp_port_out = p[TCP].sport
+ self.assertEqual(data, p[Raw].load)
+
+ # out2in
+ pkts = self.create_stream_frag(self.pg1,
+ self.nat_addr,
+ 20,
+ self.tcp_port_out,
+ data)
+ self.pg1.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ frags = self.pg0.get_capture(len(pkts))
+ p = self.reass_frags_and_verify(frags,
+ self.pg1.remote_ip4,
+ self.pg0.remote_ip4)
+ self.assertEqual(p[TCP].sport, 20)
+ self.assertEqual(p[TCP].dport, self.tcp_port_in)
+ self.assertEqual(data, p[Raw].load)
+
+ reass = self.vapi.nat_reass_dump()
+ reass_n_end = len(reass)
+
+ self.assertEqual(reass_n_end - reass_n_start, 2)
+
+ def test_reass_hairpinning(self):
+ """ NAT44 fragments hairpinning """
+ host = self.pg0.remote_hosts[0]
+ server = self.pg0.remote_hosts[1]
+ host_in_port = random.randint(1025, 65535)
+ host_out_port = 0
+ server_in_port = random.randint(1025, 65535)
+ server_out_port = random.randint(1025, 65535)
+ data = "A" * 4 + "B" * 16 + "C" * 3
+
+ self.nat44_add_address(self.nat_addr)
+ self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+ # add static mapping for server
+ self.nat44_add_static_mapping(server.ip4, self.nat_addr,
+ server_in_port, server_out_port,
+ proto=IP_PROTOS.tcp)
+
+ # send packet from host to server
+ pkts = self.create_stream_frag(self.pg0,
+ self.nat_addr,
+ host_in_port,
+ server_out_port,
+ data)
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ frags = self.pg0.get_capture(len(pkts))
+ p = self.reass_frags_and_verify(frags,
+ self.nat_addr,
+ server.ip4)
+ self.assertNotEqual(p[TCP].sport, host_in_port)
+ self.assertEqual(p[TCP].dport, server_in_port)
+ self.assertEqual(data, p[Raw].load)
+
+ def test_frag_out_of_order(self):
+ """ NAT44 translate fragments arriving out of order """
+ self.nat44_add_address(self.nat_addr)
+ self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+
+ data = "A" * 4 + "B" * 16 + "C" * 3
+ random.randint(1025, 65535)
+
+ # in2out
+ pkts = self.create_stream_frag(self.pg0,
+ self.pg1.remote_ip4,
+ self.tcp_port_in,
+ 20,
+ data)
+ pkts.reverse()
+ self.pg0.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ frags = self.pg1.get_capture(len(pkts))
+ p = self.reass_frags_and_verify(frags,
+ self.nat_addr,
+ self.pg1.remote_ip4)
+ self.assertEqual(p[TCP].dport, 20)
+ self.assertNotEqual(p[TCP].sport, self.tcp_port_in)
+ self.tcp_port_out = p[TCP].sport
+ self.assertEqual(data, p[Raw].load)
+
+ # out2in
+ pkts = self.create_stream_frag(self.pg1,
+ self.nat_addr,
+ 20,
+ self.tcp_port_out,
+ data)
+ pkts.reverse()
+ self.pg1.add_stream(pkts)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ frags = self.pg0.get_capture(len(pkts))
+ p = self.reass_frags_and_verify(frags,
+ self.pg1.remote_ip4,
+ self.pg0.remote_ip4)
+ self.assertEqual(p[TCP].sport, 20)
+ self.assertEqual(p[TCP].dport, self.tcp_port_in)
+ self.assertEqual(data, p[Raw].load)
+
+ def test_port_restricted(self):
+ """ Port restricted NAT44 (MAP-E CE) """
+ self.nat44_add_address(self.nat_addr)
+ self.vapi.nat44_interface_add_del_feature(self.pg0.sw_if_index)
+ self.vapi.nat44_interface_add_del_feature(self.pg1.sw_if_index,
+ is_inside=0)
+ self.vapi.cli("nat addr-port-assignment-alg map-e psid 10 "
+ "psid-offset 6 psid-len 6")
+
+ p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
+ TCP(sport=4567, dport=22))
+ self.pg0.add_stream(p)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg1.get_capture(1)
+ p = capture[0]
+ try:
+ ip = p[IP]
+ tcp = p[TCP]
+ self.assertEqual(ip.dst, self.pg1.remote_ip4)
+ self.assertEqual(ip.src, self.nat_addr)
+ self.assertEqual(tcp.dport, 22)
+ self.assertNotEqual(tcp.sport, 4567)
+ self.assertEqual((tcp.sport >> 6) & 63, 10)
+ self.check_tcp_checksum(p)
+ self.check_ip_checksum(p)
+ except:
+ self.logger.error(ppp("Unexpected or invalid packet:", p))
+ raise
+