diff options
| -rw-r--r-- | test/test_snat.py | 467 |
1 files changed, 466 insertions, 1 deletions
diff --git a/test/test_snat.py b/test/test_snat.py index 4739a7ceb7a..b455e620c74 100644 --- a/test/test_snat.py +++ b/test/test_snat.py @@ -4,13 +4,14 @@ import socket import unittest import struct -from framework import VppTestCase, VppTestRunner +from framework import VppTestCase, VppTestRunner, running_extended_tests from scapy.layers.inet import IP, TCP, UDP, ICMP from scapy.layers.inet import IPerror, TCPerror, UDPerror, ICMPerror from scapy.layers.l2 import Ether, ARP from scapy.data import IP_PROTOS from util import ppp from ipfix import IPFIX, Set, Template, Data, IPFIXDecoder +from time import sleep class MethodHolder(VppTestCase): @@ -1300,6 +1301,13 @@ class TestDeterministicNAT(MethodHolder): super(TestDeterministicNAT, cls).setUpClass() try: + cls.tcp_port_in = 6303 + cls.tcp_port_out = 6303 + cls.udp_port_in = 6304 + cls.udp_port_out = 6304 + cls.icmp_id_in = 6305 + cls.snat_addr = '10.0.0.3' + cls.create_pg_interfaces(range(2)) cls.interfaces = list(cls.pg_interfaces) @@ -1308,10 +1316,143 @@ class TestDeterministicNAT(MethodHolder): i.config_ip4() i.resolve_arp() + cls.pg0.generate_remote_hosts(2) + cls.pg0.configure_ipv4_neighbors() + except Exception: super(TestDeterministicNAT, cls).tearDownClass() raise + def create_stream_in(self, in_if, out_if, ttl=64): + """ + Create packet stream for inside network + + :param in_if: Inside interface + :param out_if: Outside interface + :param ttl: TTL of generated packets + """ + pkts = [] + # TCP + p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) / + IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=ttl) / + TCP(sport=self.tcp_port_in, dport=self.tcp_port_out)) + pkts.append(p) + + # UDP + p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) / + IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=ttl) / + UDP(sport=self.udp_port_in, dport=self.udp_port_out)) + pkts.append(p) + + # ICMP + p = (Ether(dst=in_if.local_mac, src=in_if.remote_mac) / + IP(src=in_if.remote_ip4, dst=out_if.remote_ip4, ttl=ttl) / + ICMP(id=self.icmp_id_in, type='echo-request')) + pkts.append(p) + + return pkts + + def create_stream_out(self, out_if, dst_ip=None, ttl=64): + """ + Create packet stream for outside network + + :param out_if: Outside interface + :param dst_ip: Destination IP address (Default use global SNAT address) + :param ttl: TTL of generated packets + """ + if dst_ip is None: + dst_ip = self.snat_addr + pkts = [] + # TCP + p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) / + IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) / + TCP(dport=self.tcp_external_port, sport=self.tcp_port_out)) + pkts.append(p) + + # UDP + p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) / + IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) / + UDP(dport=self.udp_external_port, sport=self.udp_port_out)) + pkts.append(p) + + # ICMP + p = (Ether(dst=out_if.local_mac, src=out_if.remote_mac) / + IP(src=out_if.remote_ip4, dst=dst_ip, ttl=ttl) / + ICMP(id=self.icmp_external_id, type='echo-reply')) + pkts.append(p) + + return pkts + + def verify_capture_out(self, capture, nat_ip=None, packet_num=3): + """ + Verify captured packets on outside network + + :param capture: Captured packets + :param nat_ip: Translated IP address (Default use global SNAT address) + :param same_port: Sorce port number is not translated (Default False) + :param packet_num: Expected number of packets (Default 3) + """ + if nat_ip is None: + nat_ip = self.snat_addr + self.assertEqual(packet_num, len(capture)) + for packet in capture: + try: + self.assertEqual(packet[IP].src, nat_ip) + if packet.haslayer(TCP): + self.tcp_external_port = packet[TCP].sport + elif packet.haslayer(UDP): + self.udp_external_port = packet[UDP].sport + else: + self.icmp_external_id = packet[ICMP].id + except: + self.logger.error(ppp("Unexpected or invalid packet " + "(outside network):", packet)) + raise + + def initiate_tcp_session(self, in_if, out_if): + """ + Initiates TCP session + + :param in_if: Inside interface + :param out_if: Outside interface + """ + try: + # 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=self.tcp_port_in, dport=self.tcp_port_out, + 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] + self.tcp_external_port = 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.snat_addr) / + TCP(sport=self.tcp_port_out, dport=self.tcp_external_port, + 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=self.tcp_port_in, dport=self.tcp_port_out, + flags="A")) + in_if.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + out_if.get_capture(1) + + except: + self.logger.error("TCP 3 way handshake failed") + raise + def test_deterministic_mode(self): """ S-NAT run deterministic mode """ in_addr = '172.16.255.0' @@ -1363,6 +1504,324 @@ class TestDeterministicNAT(MethodHolder): self.assertNotEqual(timeouts_before.tcp_transitory, timeouts_after.tcp_transitory) + def test_det_in(self): + """ CGNAT translation test (TCP, UDP, ICMP) """ + + nat_ip = "10.0.0.10" + self.tcp_port_out = 6303 + self.udp_port_out = 6304 + self.icmp_id_in = 6305 + self.tcp_external_port = 7303 + self.udp_external_port = 7304 + self.icmp_id_out = 7305 + + self.vapi.snat_add_det_map(self.pg0.remote_ip4n, + 32, + socket.inet_aton(nat_ip), + 32) + 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) + + # in2out + pkts = self.create_stream_in(self.pg0, self.pg1) + self.pg0.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg1.get_capture(len(pkts)) + self.verify_capture_out(capture, nat_ip) + + # out2in + pkts = self.create_stream_out(self.pg1, nat_ip) + self.pg1.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg0.get_capture(len(pkts)) + self.verify_capture_in(capture, self.pg0) + + def test_multiple_users(self): + """ CGNAT multiple users """ + + nat_ip = "10.0.0.10" + port_in = 80 + port_out = 6303 + + host0 = self.pg0.remote_hosts[0] + host1 = self.pg0.remote_hosts[1] + + self.vapi.snat_add_det_map(host0.ip4n, + 24, + socket.inet_aton(nat_ip), + 32) + 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) + + # host0 to out + p = (Ether(src=host0.mac, dst=self.pg0.local_mac) / + IP(src=host0.ip4, dst=self.pg1.remote_ip4) / + TCP(sport=port_in, dport=port_out)) + 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.src, nat_ip) + self.assertEqual(ip.dst, self.pg1.remote_ip4) + self.assertEqual(tcp.dport, port_out) + external_port0 = tcp.sport + except: + self.logger.error(ppp("Unexpected or invalid packet:", p)) + raise + + # host1 to out + p = (Ether(src=host1.mac, dst=self.pg0.local_mac) / + IP(src=host1.ip4, dst=self.pg1.remote_ip4) / + TCP(sport=port_in, dport=port_out)) + 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.src, nat_ip) + self.assertEqual(ip.dst, self.pg1.remote_ip4) + self.assertEqual(tcp.dport, port_out) + external_port1 = tcp.sport + except: + self.logger.error(ppp("Unexpected or invalid packet:", p)) + raise + + dms = self.vapi.snat_det_map_dump() + self.assertEqual(1, len(dms)) + self.assertEqual(2, dms[0].ses_num) + + # out to host0 + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=nat_ip) / + TCP(sport=port_out, dport=external_port0)) + self.pg1.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg0.get_capture(1) + p = capture[0] + try: + ip = p[IP] + tcp = p[TCP] + self.assertEqual(ip.src, self.pg1.remote_ip4) + self.assertEqual(ip.dst, host0.ip4) + self.assertEqual(tcp.dport, port_in) + self.assertEqual(tcp.sport, port_out) + except: + self.logger.error(ppp("Unexpected or invalid packet:", p)) + raise + + # out to host1 + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=nat_ip) / + TCP(sport=port_out, dport=external_port1)) + self.pg1.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg0.get_capture(1) + p = capture[0] + try: + ip = p[IP] + tcp = p[TCP] + self.assertEqual(ip.src, self.pg1.remote_ip4) + self.assertEqual(ip.dst, host1.ip4) + self.assertEqual(tcp.dport, port_in) + self.assertEqual(tcp.sport, port_out) + except: + self.logger.error(ppp("Unexpected or invalid packet", p)) + raise + + def test_tcp_session_close_detection_in(self): + """ CGNAT TCP session close initiated from inside network """ + self.vapi.snat_add_det_map(self.pg0.remote_ip4n, + 32, + socket.inet_aton(self.snat_addr), + 32) + 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) + + self.initiate_tcp_session(self.pg0, self.pg1) + + # close the session from inside + try: + # FIN packet in -> out + 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=self.tcp_port_in, dport=self.tcp_port_out, + flags="F")) + self.pg0.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg1.get_capture(1) + + pkts = [] + + # ACK packet out -> in + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=self.snat_addr) / + TCP(sport=self.tcp_port_out, dport=self.tcp_external_port, + flags="A")) + pkts.append(p) + + # FIN packet out -> in + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=self.snat_addr) / + TCP(sport=self.tcp_port_out, dport=self.tcp_external_port, + flags="F")) + pkts.append(p) + + self.pg1.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg0.get_capture(2) + + # ACK packet in -> out + 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=self.tcp_port_in, dport=self.tcp_port_out, + flags="A")) + self.pg0.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg1.get_capture(1) + + # Check if snat closed the session + dms = self.vapi.snat_det_map_dump() + self.assertEqual(0, dms[0].ses_num) + except: + self.logger.error("TCP session termination failed") + raise + + def test_tcp_session_close_detection_out(self): + """ CGNAT TCP session close initiated from outside network """ + self.vapi.snat_add_det_map(self.pg0.remote_ip4n, + 32, + socket.inet_aton(self.snat_addr), + 32) + 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) + + self.initiate_tcp_session(self.pg0, self.pg1) + + # close the session from outside + try: + # FIN packet out -> in + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=self.snat_addr) / + TCP(sport=self.tcp_port_out, dport=self.tcp_external_port, + flags="F")) + self.pg1.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg0.get_capture(1) + + pkts = [] + + # ACK packet in -> out + 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=self.tcp_port_in, dport=self.tcp_port_out, + flags="A")) + pkts.append(p) + + # ACK packet in -> out + 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=self.tcp_port_in, dport=self.tcp_port_out, + flags="F")) + pkts.append(p) + + self.pg0.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg1.get_capture(2) + + # ACK packet out -> in + p = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / + IP(src=self.pg1.remote_ip4, dst=self.snat_addr) / + TCP(sport=self.tcp_port_out, dport=self.tcp_external_port, + flags="A")) + self.pg1.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + self.pg0.get_capture(1) + + # Check if snat closed the session + dms = self.vapi.snat_det_map_dump() + self.assertEqual(0, dms[0].ses_num) + except: + self.logger.error("TCP session termination failed") + raise + + @unittest.skipUnless(running_extended_tests(), "part of extended tests") + def test_session_timeout(self): + """ CGNAT session timeouts """ + self.vapi.snat_add_det_map(self.pg0.remote_ip4n, + 32, + socket.inet_aton(self.snat_addr), + 32) + 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) + + self.initiate_tcp_session(self.pg0, self.pg1) + self.vapi.snat_det_set_timeouts(5, 5, 5, 5) + pkts = self.create_stream_in(self.pg0, self.pg1) + self.pg0.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg1.get_capture(len(pkts)) + sleep(15) + + dms = self.vapi.snat_det_map_dump() + self.assertEqual(0, dms[0].ses_num) + + def test_session_limit_per_user(self): + """ CGNAT maximum 1000 sessions per user should be created """ + self.vapi.snat_add_det_map(self.pg0.remote_ip4n, + 32, + socket.inet_aton(self.snat_addr), + 32) + 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) + + pkts = [] + for port in range(1025, 2025): + p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) / + UDP(sport=port, dport=port)) + pkts.append(p) + + self.pg0.add_stream(pkts) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg1.get_capture(len(pkts)) + + p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / + IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) / + UDP(sport=3000, dport=3000)) + self.pg0.add_stream(p) + self.pg_enable_capture(self.pg_interfaces) + self.pg_start() + capture = self.pg1.assert_nothing_captured() + + dms = self.vapi.snat_det_map_dump() + + self.assertEqual(1000, dms[0].ses_num) + def clear_snat(self): """ Clear SNAT configuration. @@ -1376,6 +1835,12 @@ class TestDeterministicNAT(MethodHolder): dsm.out_plen, is_add=0) + interfaces = self.vapi.snat_interface_dump() + for intf in interfaces: + self.vapi.snat_interface_add_del_feature(intf.sw_if_index, + intf.is_inside, + is_add=0) + def tearDown(self): super(TestDeterministicNAT, self).tearDown() if not self.vpp_dead: |