| #!/usr/bin/env python |
| |
| import socket |
| import unittest |
| import struct |
| |
| 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): |
| """ SNAT create capture and verify method holder """ |
| |
| @classmethod |
| def setUpClass(cls): |
| super(MethodHolder, cls).setUpClass() |
| |
| def tearDown(self): |
| super(MethodHolder, self).tearDown() |
| |
| 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)) |
| 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)) |
| 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_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_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_id_out, type='echo-reply')) |
| pkts.append(p) |
| |
| return pkts |
| |
| def verify_capture_out(self, capture, nat_ip=None, same_port=False, |
| 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): |
| if same_port: |
| self.assertEqual(packet[TCP].sport, self.tcp_port_in) |
| else: |
| self.assertNotEqual( |
| packet[TCP].sport, self.tcp_port_in) |
| self.tcp_port_out = packet[TCP].sport |
| elif packet.haslayer(UDP): |
| if same_port: |
| self.assertEqual(packet[UDP].sport, self.udp_port_in) |
| else: |
| self.assertNotEqual( |
| packet[UDP].sport, self.udp_port_in) |
| self.udp_port_out = packet[UDP].sport |
| else: |
| if same_port: |
| self.assertEqual(packet[ICMP].id, self.icmp_id_in) |
| else: |
| self.assertNotEqual(packet[ICMP].id, self.icmp_id_in) |
| self.icmp_id_out = packet[ICMP].id |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(outside network):", packet)) |
| raise |
| |
| def verify_capture_in(self, capture, in_if, packet_num=3): |
| """ |
| Verify captured packets on inside network |
| |
| :param capture: Captured packets |
| :param in_if: Inside interface |
| :param packet_num: Expected number of packets (Default 3) |
| """ |
| self.assertEqual(packet_num, len(capture)) |
| for packet in capture: |
| try: |
| self.assertEqual(packet[IP].dst, in_if.remote_ip4) |
| if packet.haslayer(TCP): |
| self.assertEqual(packet[TCP].dport, self.tcp_port_in) |
| elif packet.haslayer(UDP): |
| self.assertEqual(packet[UDP].dport, self.udp_port_in) |
| else: |
| self.assertEqual(packet[ICMP].id, self.icmp_id_in) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(inside network):", packet)) |
| raise |
| |
| def verify_capture_no_translation(self, capture, ingress_if, egress_if): |
| """ |
| Verify captured packet that don't have to be translated |
| |
| :param capture: Captured packets |
| :param ingress_if: Ingress interface |
| :param egress_if: Egress interface |
| """ |
| for packet in capture: |
| try: |
| self.assertEqual(packet[IP].src, ingress_if.remote_ip4) |
| self.assertEqual(packet[IP].dst, egress_if.remote_ip4) |
| if packet.haslayer(TCP): |
| self.assertEqual(packet[TCP].sport, self.tcp_port_in) |
| elif packet.haslayer(UDP): |
| self.assertEqual(packet[UDP].sport, self.udp_port_in) |
| else: |
| self.assertEqual(packet[ICMP].id, self.icmp_id_in) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(inside network):", packet)) |
| raise |
| |
| def verify_capture_out_with_icmp_errors(self, capture, src_ip=None, |
| packet_num=3, icmp_type=11): |
| """ |
| Verify captured packets with ICMP errors on outside network |
| |
| :param capture: Captured packets |
| :param src_ip: Translated IP address or IP address of VPP |
| (Default use global SNAT address) |
| :param packet_num: Expected number of packets (Default 3) |
| :param icmp_type: Type of error ICMP packet |
| we are expecting (Default 11) |
| """ |
| if src_ip is None: |
| src_ip = self.snat_addr |
| self.assertEqual(packet_num, len(capture)) |
| for packet in capture: |
| try: |
| self.assertEqual(packet[IP].src, src_ip) |
| self.assertTrue(packet.haslayer(ICMP)) |
| icmp = packet[ICMP] |
| self.assertEqual(icmp.type, icmp_type) |
| self.assertTrue(icmp.haslayer(IPerror)) |
| inner_ip = icmp[IPerror] |
| if inner_ip.haslayer(TCPerror): |
| self.assertEqual(inner_ip[TCPerror].dport, |
| self.tcp_port_out) |
| elif inner_ip.haslayer(UDPerror): |
| self.assertEqual(inner_ip[UDPerror].dport, |
| self.udp_port_out) |
| else: |
| self.assertEqual(inner_ip[ICMPerror].id, self.icmp_id_out) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(outside network):", packet)) |
| raise |
| |
| def verify_capture_in_with_icmp_errors(self, capture, in_if, packet_num=3, |
| icmp_type=11): |
| """ |
| Verify captured packets with ICMP errors on inside network |
| |
| :param capture: Captured packets |
| :param in_if: Inside interface |
| :param packet_num: Expected number of packets (Default 3) |
| :param icmp_type: Type of error ICMP packet |
| we are expecting (Default 11) |
| """ |
| self.assertEqual(packet_num, len(capture)) |
| for packet in capture: |
| try: |
| self.assertEqual(packet[IP].dst, in_if.remote_ip4) |
| self.assertTrue(packet.haslayer(ICMP)) |
| icmp = packet[ICMP] |
| self.assertEqual(icmp.type, icmp_type) |
| self.assertTrue(icmp.haslayer(IPerror)) |
| inner_ip = icmp[IPerror] |
| if inner_ip.haslayer(TCPerror): |
| self.assertEqual(inner_ip[TCPerror].sport, |
| self.tcp_port_in) |
| elif inner_ip.haslayer(UDPerror): |
| self.assertEqual(inner_ip[UDPerror].sport, |
| self.udp_port_in) |
| else: |
| self.assertEqual(inner_ip[ICMPerror].id, self.icmp_id_in) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(inside network):", packet)) |
| raise |
| |
| def verify_ipfix_nat44_ses(self, data): |
| """ |
| Verify IPFIX NAT44 session create/delete event |
| |
| :param data: Decoded IPFIX data records |
| """ |
| nat44_ses_create_num = 0 |
| nat44_ses_delete_num = 0 |
| self.assertEqual(6, len(data)) |
| for record in data: |
| # natEvent |
| self.assertIn(ord(record[230]), [4, 5]) |
| if ord(record[230]) == 4: |
| nat44_ses_create_num += 1 |
| else: |
| nat44_ses_delete_num += 1 |
| # sourceIPv4Address |
| self.assertEqual(self.pg0.remote_ip4n, record[8]) |
| # postNATSourceIPv4Address |
| self.assertEqual(socket.inet_pton(socket.AF_INET, self.snat_addr), |
| record[225]) |
| # ingressVRFID |
| self.assertEqual(struct.pack("!I", 0), record[234]) |
| # protocolIdentifier/sourceTransportPort/postNAPTSourceTransportPort |
| if IP_PROTOS.icmp == ord(record[4]): |
| self.assertEqual(struct.pack("!H", self.icmp_id_in), record[7]) |
| self.assertEqual(struct.pack("!H", self.icmp_id_out), |
| record[227]) |
| elif IP_PROTOS.tcp == ord(record[4]): |
| self.assertEqual(struct.pack("!H", self.tcp_port_in), |
| record[7]) |
| self.assertEqual(struct.pack("!H", self.tcp_port_out), |
| record[227]) |
| elif IP_PROTOS.udp == ord(record[4]): |
| self.assertEqual(struct.pack("!H", self.udp_port_in), |
| record[7]) |
| self.assertEqual(struct.pack("!H", self.udp_port_out), |
| record[227]) |
| else: |
| self.fail("Invalid protocol") |
| self.assertEqual(3, nat44_ses_create_num) |
| self.assertEqual(3, nat44_ses_delete_num) |
| |
| def verify_ipfix_addr_exhausted(self, data): |
| """ |
| Verify IPFIX NAT addresses event |
| |
| :param data: Decoded IPFIX data records |
| """ |
| self.assertEqual(1, len(data)) |
| record = data[0] |
| # natEvent |
| self.assertEqual(ord(record[230]), 3) |
| # natPoolID |
| self.assertEqual(struct.pack("!I", 0), record[283]) |
| |
| |
| class TestSNAT(MethodHolder): |
| """ SNAT Test Cases """ |
| |
| @classmethod |
| def setUpClass(cls): |
| super(TestSNAT, 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.icmp_id_out = 6305 |
| cls.snat_addr = '10.0.0.3' |
| |
| cls.create_pg_interfaces(range(8)) |
| cls.interfaces = list(cls.pg_interfaces[0:4]) |
| |
| for i in cls.interfaces: |
| i.admin_up() |
| 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])) |
| |
| cls.pg4._local_ip4 = "172.16.255.1" |
| cls.pg4._local_ip4n = socket.inet_pton(socket.AF_INET, i.local_ip4) |
| cls.pg4._remote_hosts[0]._ip4 = "172.16.255.2" |
| cls.pg4.set_table_ip4(10) |
| cls.pg5._local_ip4 = "172.16.255.3" |
| cls.pg5._local_ip4n = socket.inet_pton(socket.AF_INET, i.local_ip4) |
| cls.pg5._remote_hosts[0]._ip4 = "172.16.255.4" |
| cls.pg5.set_table_ip4(10) |
| cls.pg6._local_ip4 = "172.16.255.1" |
| cls.pg6._local_ip4n = socket.inet_pton(socket.AF_INET, i.local_ip4) |
| cls.pg6._remote_hosts[0]._ip4 = "172.16.255.2" |
| cls.pg6.set_table_ip4(20) |
| for i in cls.overlapping_interfaces: |
| i.config_ip4() |
| i.admin_up() |
| i.resolve_arp() |
| |
| cls.pg7.admin_up() |
| |
| except Exception: |
| super(TestSNAT, cls).tearDownClass() |
| raise |
| |
| def clear_snat(self): |
| """ |
| Clear SNAT configuration. |
| """ |
| if self.pg7.has_ip4_config: |
| self.pg7.unconfig_ip4() |
| |
| interfaces = self.vapi.snat_interface_addr_dump() |
| for intf in interfaces: |
| self.vapi.snat_add_interface_addr(intf.sw_if_index, is_add=0) |
| |
| self.vapi.snat_ipfix(enable=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) |
| |
| static_mappings = self.vapi.snat_static_mapping_dump() |
| for sm in static_mappings: |
| self.vapi.snat_add_static_mapping(sm.local_ip_address, |
| sm.external_ip_address, |
| local_port=sm.local_port, |
| external_port=sm.external_port, |
| addr_only=sm.addr_only, |
| vrf_id=sm.vrf_id, |
| protocol=sm.protocol, |
| is_add=0) |
| |
| adresses = self.vapi.snat_address_dump() |
| for addr in adresses: |
| self.vapi.snat_add_address_range(addr.ip_address, |
| addr.ip_address, |
| is_add=0) |
| |
| def snat_add_static_mapping(self, local_ip, external_ip='0.0.0.0', |
| local_port=0, external_port=0, vrf_id=0, |
| is_add=1, external_sw_if_index=0xFFFFFFFF, |
| proto=0): |
| """ |
| Add/delete S-NAT static mapping |
| |
| :param local_ip: Local IP address |
| :param external_ip: External IP address |
| :param local_port: Local port number (Optional) |
| :param external_port: External port number (Optional) |
| :param vrf_id: VRF ID (Default 0) |
| :param is_add: 1 if add, 0 if delete (Default add) |
| :param external_sw_if_index: External interface instead of IP address |
| :param proto: IP protocol (Mandatory if port specified) |
| """ |
| addr_only = 1 |
| if local_port and external_port: |
| addr_only = 0 |
| l_ip = socket.inet_pton(socket.AF_INET, local_ip) |
| e_ip = socket.inet_pton(socket.AF_INET, external_ip) |
| self.vapi.snat_add_static_mapping( |
| l_ip, |
| e_ip, |
| external_sw_if_index, |
| local_port, |
| external_port, |
| addr_only, |
| vrf_id, |
| proto, |
| is_add) |
| |
| def snat_add_address(self, ip, is_add=1, vrf_id=0xFFFFFFFF): |
| """ |
| Add/delete S-NAT address |
| |
| :param ip: IP address |
| :param is_add: 1 if add, 0 if delete (Default add) |
| """ |
| snat_addr = socket.inet_pton(socket.AF_INET, ip) |
| self.vapi.snat_add_address_range(snat_addr, snat_addr, is_add, |
| vrf_id=vrf_id) |
| |
| def test_dynamic(self): |
| """ SNAT dynamic translation test """ |
| |
| 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) |
| |
| # 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) |
| |
| # out2in |
| pkts = self.create_stream_out(self.pg1) |
| 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_dynamic_icmp_errors_in2out_ttl_1(self): |
| """ SNAT handling of client packets with TTL=1 """ |
| |
| 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) |
| |
| # Client side - generate traffic |
| pkts = self.create_stream_in(self.pg0, self.pg1, ttl=1) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Client side - verify ICMP type 11 packets |
| capture = self.pg0.get_capture(len(pkts)) |
| self.verify_capture_in_with_icmp_errors(capture, self.pg0) |
| |
| def test_dynamic_icmp_errors_out2in_ttl_1(self): |
| """ SNAT handling of server packets with TTL=1 """ |
| |
| 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) |
| |
| # Client side - create sessions |
| pkts = self.create_stream_in(self.pg0, self.pg1) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Server side - generate traffic |
| capture = self.pg1.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| pkts = self.create_stream_out(self.pg1, ttl=1) |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Server side - verify ICMP type 11 packets |
| capture = self.pg1.get_capture(len(pkts)) |
| self.verify_capture_out_with_icmp_errors(capture, |
| src_ip=self.pg1.local_ip4) |
| |
| def test_dynamic_icmp_errors_in2out_ttl_2(self): |
| """ SNAT handling of error responses to client packets with TTL=2 """ |
| |
| 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) |
| |
| # Client side - generate traffic |
| pkts = self.create_stream_in(self.pg0, self.pg1, ttl=2) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Server side - simulate ICMP type 11 response |
| capture = self.pg1.get_capture(len(pkts)) |
| pkts = [Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / |
| IP(src=self.pg1.remote_ip4, dst=self.snat_addr) / |
| ICMP(type=11) / packet[IP] for packet in capture] |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Client side - verify ICMP type 11 packets |
| capture = self.pg0.get_capture(len(pkts)) |
| self.verify_capture_in_with_icmp_errors(capture, self.pg0) |
| |
| def test_dynamic_icmp_errors_out2in_ttl_2(self): |
| """ SNAT handling of error responses to server packets with TTL=2 """ |
| |
| 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) |
| |
| # Client side - create sessions |
| pkts = self.create_stream_in(self.pg0, self.pg1) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Server side - generate traffic |
| capture = self.pg1.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| pkts = self.create_stream_out(self.pg1, ttl=2) |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Client side - simulate ICMP type 11 response |
| capture = self.pg0.get_capture(len(pkts)) |
| pkts = [Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / |
| IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) / |
| ICMP(type=11) / packet[IP] for packet in capture] |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # Server side - verify ICMP type 11 packets |
| capture = self.pg1.get_capture(len(pkts)) |
| self.verify_capture_out_with_icmp_errors(capture) |
| |
| def test_ping_out_interface_from_outside(self): |
| """ Ping SNAT out interface from outside network """ |
| |
| 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) |
| |
| p = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / |
| IP(src=self.pg1.remote_ip4, dst=self.pg1.local_ip4) / |
| ICMP(id=self.icmp_id_out, type='echo-request')) |
| pkts = [p] |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(len(pkts)) |
| self.assertEqual(1, len(capture)) |
| packet = capture[0] |
| try: |
| self.assertEqual(packet[IP].src, self.pg1.local_ip4) |
| self.assertEqual(packet[IP].dst, self.pg1.remote_ip4) |
| self.assertEqual(packet[ICMP].id, self.icmp_id_in) |
| self.assertEqual(packet[ICMP].type, 0) # echo reply |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet " |
| "(outside network):", packet)) |
| raise |
| |
| def test_ping_internal_host_from_outside(self): |
| """ Ping internal host from outside network """ |
| |
| self.snat_add_static_mapping(self.pg0.remote_ip4, 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) |
| |
| # out2in |
| pkt = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) / |
| IP(src=self.pg1.remote_ip4, dst=self.snat_addr, ttl=64) / |
| ICMP(id=self.icmp_id_out, type='echo-request')) |
| self.pg1.add_stream(pkt) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg0.get_capture(1) |
| self.verify_capture_in(capture, self.pg0, packet_num=1) |
| self.assert_equal(capture[0][IP].proto, IP_PROTOS.icmp) |
| |
| # in2out |
| pkt = (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=self.icmp_id_in, type='echo-reply')) |
| self.pg0.add_stream(pkt) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(1) |
| self.verify_capture_out(capture, same_port=True, packet_num=1) |
| self.assert_equal(capture[0][IP].proto, IP_PROTOS.icmp) |
| |
| def test_static_in(self): |
| """ SNAT 1:1 NAT initialized from inside network """ |
| |
| nat_ip = "10.0.0.10" |
| self.tcp_port_out = 6303 |
| self.udp_port_out = 6304 |
| self.icmp_id_out = 6305 |
| |
| self.snat_add_static_mapping(self.pg0.remote_ip4, nat_ip) |
| 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, True) |
| |
| # 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_static_out(self): |
| """ SNAT 1:1 NAT initialized from outside network """ |
| |
| nat_ip = "10.0.0.20" |
| self.tcp_port_out = 6303 |
| self.udp_port_out = 6304 |
| self.icmp_id_out = 6305 |
| |
| self.snat_add_static_mapping(self.pg0.remote_ip4, nat_ip) |
| 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) |
| |
| # 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) |
| |
| # 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, True) |
| |
| def test_static_with_port_in(self): |
| """ SNAT 1:1 NAT with port initialized from inside network """ |
| |
| self.tcp_port_out = 3606 |
| self.udp_port_out = 3607 |
| self.icmp_id_out = 3608 |
| |
| self.snat_add_address(self.snat_addr) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.tcp_port_in, self.tcp_port_out, |
| proto=IP_PROTOS.tcp) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.udp_port_in, self.udp_port_out, |
| proto=IP_PROTOS.udp) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.icmp_id_in, self.icmp_id_out, |
| proto=IP_PROTOS.icmp) |
| 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) |
| |
| # out2in |
| pkts = self.create_stream_out(self.pg1) |
| 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_static_with_port_out(self): |
| """ SNAT 1:1 NAT with port initialized from outside network """ |
| |
| self.tcp_port_out = 30606 |
| self.udp_port_out = 30607 |
| self.icmp_id_out = 30608 |
| |
| self.snat_add_address(self.snat_addr) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.tcp_port_in, self.tcp_port_out, |
| proto=IP_PROTOS.tcp) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.udp_port_in, self.udp_port_out, |
| proto=IP_PROTOS.udp) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr, |
| self.icmp_id_in, self.icmp_id_out, |
| proto=IP_PROTOS.icmp) |
| 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) |
| |
| # out2in |
| pkts = self.create_stream_out(self.pg1) |
| 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) |
| |
| # 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) |
| |
| def test_static_vrf_aware(self): |
| """ SNAT 1:1 NAT VRF awareness """ |
| |
| nat_ip1 = "10.0.0.30" |
| nat_ip2 = "10.0.0.40" |
| self.tcp_port_out = 6303 |
| self.udp_port_out = 6304 |
| self.icmp_id_out = 6305 |
| |
| self.snat_add_static_mapping(self.pg4.remote_ip4, nat_ip1, |
| vrf_id=10) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, nat_ip2, |
| vrf_id=10) |
| self.vapi.snat_interface_add_del_feature(self.pg3.sw_if_index, |
| is_inside=0) |
| self.vapi.snat_interface_add_del_feature(self.pg0.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg4.sw_if_index) |
| |
| # inside interface VRF match SNAT static mapping VRF |
| pkts = self.create_stream_in(self.pg4, self.pg3) |
| self.pg4.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture, nat_ip1, True) |
| |
| # inside interface VRF don't match SNAT static mapping VRF (packets |
| # are dropped) |
| pkts = self.create_stream_in(self.pg0, self.pg3) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| self.pg3.assert_nothing_captured() |
| |
| def test_multiple_inside_interfaces(self): |
| """ SNAT multiple inside interfaces (non-overlapping address space) """ |
| |
| 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) |
| self.vapi.snat_interface_add_del_feature(self.pg3.sw_if_index, |
| is_inside=0) |
| |
| # between two S-NAT inside interfaces (no translation) |
| 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_no_translation(capture, self.pg0, self.pg1) |
| |
| # from S-NAT inside to interface without S-NAT feature (no translation) |
| pkts = self.create_stream_in(self.pg0, self.pg2) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg2.get_capture(len(pkts)) |
| self.verify_capture_no_translation(capture, self.pg0, self.pg2) |
| |
| # in2out 1st interface |
| pkts = self.create_stream_in(self.pg0, self.pg3) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| |
| # out2in 1st interface |
| pkts = self.create_stream_out(self.pg3) |
| self.pg3.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) |
| |
| # in2out 2nd interface |
| pkts = self.create_stream_in(self.pg1, self.pg3) |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| |
| # out2in 2nd interface |
| pkts = self.create_stream_out(self.pg3) |
| self.pg3.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(len(pkts)) |
| self.verify_capture_in(capture, self.pg1) |
| |
| def test_inside_overlapping_interfaces(self): |
| """ SNAT multiple inside interfaces with overlapping address space """ |
| |
| static_nat_ip = "10.0.0.10" |
| self.snat_add_address(self.snat_addr) |
| self.vapi.snat_interface_add_del_feature(self.pg3.sw_if_index, |
| is_inside=0) |
| self.vapi.snat_interface_add_del_feature(self.pg4.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg5.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg6.sw_if_index) |
| self.snat_add_static_mapping(self.pg6.remote_ip4, static_nat_ip, |
| vrf_id=20) |
| |
| # between S-NAT inside interfaces with same VRF (no translation) |
| pkts = self.create_stream_in(self.pg4, self.pg5) |
| self.pg4.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg5.get_capture(len(pkts)) |
| self.verify_capture_no_translation(capture, self.pg4, self.pg5) |
| |
| # between S-NAT inside interfaces with different VRF (hairpinning) |
| p = (Ether(src=self.pg4.remote_mac, dst=self.pg4.local_mac) / |
| IP(src=self.pg4.remote_ip4, dst=static_nat_ip) / |
| TCP(sport=1234, dport=5678)) |
| self.pg4.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg6.get_capture(1) |
| p = capture[0] |
| try: |
| ip = p[IP] |
| tcp = p[TCP] |
| self.assertEqual(ip.src, self.snat_addr) |
| self.assertEqual(ip.dst, self.pg6.remote_ip4) |
| self.assertNotEqual(tcp.sport, 1234) |
| self.assertEqual(tcp.dport, 5678) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet:", p)) |
| raise |
| |
| # in2out 1st interface |
| pkts = self.create_stream_in(self.pg4, self.pg3) |
| self.pg4.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| |
| # out2in 1st interface |
| pkts = self.create_stream_out(self.pg3) |
| self.pg3.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg4.get_capture(len(pkts)) |
| self.verify_capture_in(capture, self.pg4) |
| |
| # in2out 2nd interface |
| pkts = self.create_stream_in(self.pg5, self.pg3) |
| self.pg5.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture) |
| |
| # out2in 2nd interface |
| pkts = self.create_stream_out(self.pg3) |
| self.pg3.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg5.get_capture(len(pkts)) |
| self.verify_capture_in(capture, self.pg5) |
| |
| # pg5 session dump |
| addresses = self.vapi.snat_address_dump() |
| self.assertEqual(len(addresses), 1) |
| sessions = self.vapi.snat_user_session_dump(self.pg5.remote_ip4n, 10) |
| self.assertEqual(len(sessions), 3) |
| for session in sessions: |
| self.assertFalse(session.is_static) |
| self.assertEqual(session.inside_ip_address[0:4], |
| self.pg5.remote_ip4n) |
| self.assertEqual(session.outside_ip_address, |
| addresses[0].ip_address) |
| self.assertEqual(sessions[0].protocol, IP_PROTOS.tcp) |
| self.assertEqual(sessions[1].protocol, IP_PROTOS.udp) |
| self.assertEqual(sessions[2].protocol, IP_PROTOS.icmp) |
| self.assertEqual(sessions[0].inside_port, self.tcp_port_in) |
| self.assertEqual(sessions[1].inside_port, self.udp_port_in) |
| self.assertEqual(sessions[2].inside_port, self.icmp_id_in) |
| self.assertEqual(sessions[0].outside_port, self.tcp_port_out) |
| self.assertEqual(sessions[1].outside_port, self.udp_port_out) |
| self.assertEqual(sessions[2].outside_port, self.icmp_id_out) |
| |
| # in2out 3rd interface |
| pkts = self.create_stream_in(self.pg6, self.pg3) |
| self.pg6.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg3.get_capture(len(pkts)) |
| self.verify_capture_out(capture, static_nat_ip, True) |
| |
| # out2in 3rd interface |
| pkts = self.create_stream_out(self.pg3, static_nat_ip) |
| self.pg3.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg6.get_capture(len(pkts)) |
| self.verify_capture_in(capture, self.pg6) |
| |
| # general user and session dump verifications |
| users = self.vapi.snat_user_dump() |
| self.assertTrue(len(users) >= 3) |
| addresses = self.vapi.snat_address_dump() |
| self.assertEqual(len(addresses), 1) |
| for user in users: |
| sessions = self.vapi.snat_user_session_dump(user.ip_address, |
| user.vrf_id) |
| for session in sessions: |
| self.assertEqual(user.ip_address, session.inside_ip_address) |
| self.assertTrue(session.total_bytes > session.total_pkts > 0) |
| self.assertTrue(session.protocol in |
| [IP_PROTOS.tcp, IP_PROTOS.udp, |
| IP_PROTOS.icmp]) |
| |
| # pg4 session dump |
| sessions = self.vapi.snat_user_session_dump(self.pg4.remote_ip4n, 10) |
| self.assertTrue(len(sessions) >= 4) |
| for session in sessions: |
| self.assertFalse(session.is_static) |
| self.assertEqual(session.inside_ip_address[0:4], |
| self.pg4.remote_ip4n) |
| self.assertEqual(session.outside_ip_address, |
| addresses[0].ip_address) |
| |
| # pg6 session dump |
| sessions = self.vapi.snat_user_session_dump(self.pg6.remote_ip4n, 20) |
| self.assertTrue(len(sessions) >= 3) |
| for session in sessions: |
| self.assertTrue(session.is_static) |
| self.assertEqual(session.inside_ip_address[0:4], |
| self.pg6.remote_ip4n) |
| self.assertEqual(map(ord, session.outside_ip_address[0:4]), |
| map(int, static_nat_ip.split('.'))) |
| self.assertTrue(session.inside_port in |
| [self.tcp_port_in, self.udp_port_in, |
| self.icmp_id_in]) |
| |
| 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, |
| proto=IP_PROTOS.tcp) |
| |
| # 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(1) |
| 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: |
| self.logger.error(ppp("Unexpected or invalid packet:", p)) |
| 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(1) |
| 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: |
| self.logger.error(ppp("Unexpected or invalid packet:"), p) |
| raise |
| |
| def test_max_translations_per_user(self): |
| """ MAX translations per user - recycle the least recently used """ |
| |
| 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) |
| |
| # get maximum number of translations per user |
| snat_config = self.vapi.snat_show_config() |
| |
| # send more than maximum number of translations per user packets |
| pkts_num = snat_config.max_translations_per_user + 5 |
| pkts = [] |
| for port in range(0, pkts_num): |
| p = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / |
| IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) / |
| TCP(sport=1025 + port)) |
| pkts.append(p) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| |
| # verify number of translated packet |
| self.pg1.get_capture(pkts_num) |
| |
| def test_interface_addr(self): |
| """ Acquire SNAT addresses from interface """ |
| self.vapi.snat_add_interface_addr(self.pg7.sw_if_index) |
| |
| # no address in NAT pool |
| adresses = self.vapi.snat_address_dump() |
| self.assertEqual(0, len(adresses)) |
| |
| # configure interface address and check NAT address pool |
| self.pg7.config_ip4() |
| adresses = self.vapi.snat_address_dump() |
| self.assertEqual(1, len(adresses)) |
| self.assertEqual(adresses[0].ip_address[0:4], self.pg7.local_ip4n) |
| |
| # remove interface address and check NAT address pool |
| self.pg7.unconfig_ip4() |
| adresses = self.vapi.snat_address_dump() |
| self.assertEqual(0, len(adresses)) |
| |
| def test_interface_addr_static_mapping(self): |
| """ Static mapping with addresses from interface """ |
| self.vapi.snat_add_interface_addr(self.pg7.sw_if_index) |
| self.snat_add_static_mapping('1.2.3.4', |
| external_sw_if_index=self.pg7.sw_if_index) |
| |
| # static mappings with external interface |
| static_mappings = self.vapi.snat_static_mapping_dump() |
| self.assertEqual(1, len(static_mappings)) |
| self.assertEqual(self.pg7.sw_if_index, |
| static_mappings[0].external_sw_if_index) |
| |
| # configure interface address and check static mappings |
| self.pg7.config_ip4() |
| static_mappings = self.vapi.snat_static_mapping_dump() |
| self.assertEqual(1, len(static_mappings)) |
| self.assertEqual(static_mappings[0].external_ip_address[0:4], |
| self.pg7.local_ip4n) |
| self.assertEqual(0xFFFFFFFF, static_mappings[0].external_sw_if_index) |
| |
| # remove interface address and check static mappings |
| self.pg7.unconfig_ip4() |
| static_mappings = self.vapi.snat_static_mapping_dump() |
| self.assertEqual(0, len(static_mappings)) |
| |
| def test_ipfix_nat44_sess(self): |
| """ S-NAT IPFIX logging NAT44 session created/delted """ |
| 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) |
| self.vapi.set_ipfix_exporter(collector_address=self.pg3.remote_ip4n, |
| src_address=self.pg3.local_ip4n, |
| path_mtu=512, |
| template_interval=10) |
| self.vapi.snat_ipfix() |
| |
| 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) |
| self.snat_add_address(self.snat_addr, is_add=0) |
| self.vapi.cli("ipfix flush") # FIXME this should be an API call |
| capture = self.pg3.get_capture(3) |
| ipfix = IPFIXDecoder() |
| # first load template |
| for p in capture: |
| self.assertTrue(p.haslayer(IPFIX)) |
| if p.haslayer(Template): |
| ipfix.add_template(p.getlayer(Template)) |
| # verify events in data set |
| for p in capture: |
| if p.haslayer(Data): |
| data = ipfix.decode_data_set(p.getlayer(Set)) |
| self.verify_ipfix_nat44_ses(data) |
| |
| def test_ipfix_addr_exhausted(self): |
| """ S-NAT IPFIX logging NAT addresses exhausted """ |
| 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.vapi.set_ipfix_exporter(collector_address=self.pg3.remote_ip4n, |
| src_address=self.pg3.local_ip4n, |
| path_mtu=512, |
| template_interval=10) |
| self.vapi.snat_ipfix() |
| |
| 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=3025)) |
| self.pg0.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(0) |
| self.vapi.cli("ipfix flush") # FIXME this should be an API call |
| capture = self.pg3.get_capture(3) |
| ipfix = IPFIXDecoder() |
| # first load template |
| for p in capture: |
| self.assertTrue(p.haslayer(IPFIX)) |
| if p.haslayer(Template): |
| ipfix.add_template(p.getlayer(Template)) |
| # verify events in data set |
| for p in capture: |
| if p.haslayer(Data): |
| data = ipfix.decode_data_set(p.getlayer(Set)) |
| self.verify_ipfix_addr_exhausted(data) |
| |
| def test_pool_addr_fib(self): |
| """ S-NAT add pool addresses to FIB """ |
| static_addr = '10.0.0.10' |
| 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) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, static_addr) |
| |
| # SNAT address |
| p = (Ether(src=self.pg1.remote_mac, dst='ff:ff:ff:ff:ff:ff') / |
| ARP(op=ARP.who_has, pdst=self.snat_addr, |
| psrc=self.pg1.remote_ip4, hwsrc=self.pg1.remote_mac)) |
| self.pg1.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(1) |
| self.assertTrue(capture[0].haslayer(ARP)) |
| self.assertTrue(capture[0][ARP].op, ARP.is_at) |
| |
| # 1:1 NAT address |
| p = (Ether(src=self.pg1.remote_mac, dst='ff:ff:ff:ff:ff:ff') / |
| ARP(op=ARP.who_has, pdst=static_addr, |
| psrc=self.pg1.remote_ip4, hwsrc=self.pg1.remote_mac)) |
| self.pg1.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(1) |
| self.assertTrue(capture[0].haslayer(ARP)) |
| self.assertTrue(capture[0][ARP].op, ARP.is_at) |
| |
| # send ARP to non-SNAT interface |
| p = (Ether(src=self.pg2.remote_mac, dst='ff:ff:ff:ff:ff:ff') / |
| ARP(op=ARP.who_has, pdst=self.snat_addr, |
| psrc=self.pg2.remote_ip4, hwsrc=self.pg2.remote_mac)) |
| self.pg2.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(0) |
| |
| # remove addresses and verify |
| self.snat_add_address(self.snat_addr, is_add=0) |
| self.snat_add_static_mapping(self.pg0.remote_ip4, static_addr, |
| is_add=0) |
| |
| p = (Ether(src=self.pg1.remote_mac, dst='ff:ff:ff:ff:ff:ff') / |
| ARP(op=ARP.who_has, pdst=self.snat_addr, |
| psrc=self.pg1.remote_ip4, hwsrc=self.pg1.remote_mac)) |
| self.pg1.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(0) |
| |
| p = (Ether(src=self.pg1.remote_mac, dst='ff:ff:ff:ff:ff:ff') / |
| ARP(op=ARP.who_has, pdst=static_addr, |
| psrc=self.pg1.remote_ip4, hwsrc=self.pg1.remote_mac)) |
| self.pg1.add_stream(p) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg1.get_capture(0) |
| |
| def test_vrf_mode(self): |
| """ S-NAT tenant VRF aware address pool mode """ |
| |
| vrf_id1 = 1 |
| vrf_id2 = 2 |
| nat_ip1 = "10.0.0.10" |
| nat_ip2 = "10.0.0.11" |
| |
| self.pg0.unconfig_ip4() |
| self.pg1.unconfig_ip4() |
| self.pg0.set_table_ip4(vrf_id1) |
| self.pg1.set_table_ip4(vrf_id2) |
| self.pg0.config_ip4() |
| self.pg1.config_ip4() |
| |
| self.snat_add_address(nat_ip1, vrf_id=vrf_id1) |
| self.snat_add_address(nat_ip2, vrf_id=vrf_id2) |
| self.vapi.snat_interface_add_del_feature(self.pg0.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg1.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg2.sw_if_index, |
| is_inside=0) |
| |
| # first VRF |
| pkts = self.create_stream_in(self.pg0, self.pg2) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg2.get_capture(len(pkts)) |
| self.verify_capture_out(capture, nat_ip1) |
| |
| # second VRF |
| pkts = self.create_stream_in(self.pg1, self.pg2) |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg2.get_capture(len(pkts)) |
| self.verify_capture_out(capture, nat_ip2) |
| |
| def test_vrf_feature_independent(self): |
| """ S-NAT tenant VRF independent address pool mode """ |
| |
| nat_ip1 = "10.0.0.10" |
| nat_ip2 = "10.0.0.11" |
| |
| self.snat_add_address(nat_ip1) |
| self.snat_add_address(nat_ip2) |
| self.vapi.snat_interface_add_del_feature(self.pg0.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg1.sw_if_index) |
| self.vapi.snat_interface_add_del_feature(self.pg2.sw_if_index, |
| is_inside=0) |
| |
| # first VRF |
| pkts = self.create_stream_in(self.pg0, self.pg2) |
| self.pg0.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg2.get_capture(len(pkts)) |
| self.verify_capture_out(capture, nat_ip1) |
| |
| # second VRF |
| pkts = self.create_stream_in(self.pg1, self.pg2) |
| self.pg1.add_stream(pkts) |
| self.pg_enable_capture(self.pg_interfaces) |
| self.pg_start() |
| capture = self.pg2.get_capture(len(pkts)) |
| self.verify_capture_out(capture, nat_ip1) |
| |
| def tearDown(self): |
| super(TestSNAT, self).tearDown() |
| if not self.vpp_dead: |
| self.logger.info(self.vapi.cli("show snat verbose")) |
| self.clear_snat() |
| |
| |
| class TestDeterministicNAT(MethodHolder): |
| """ Deterministic NAT Test Cases """ |
| |
| @classmethod |
| def setUpConstants(cls): |
| super(TestDeterministicNAT, cls).setUpConstants() |
| cls.vpp_cmdline.extend(["snat", "{", "deterministic", "}"]) |
| |
| @classmethod |
| def setUpClass(cls): |
| super(TestDeterministicNAT, cls).setUpClass() |
| |
| try: |
| cls.tcp_port_in = 6303 |
| cls.tcp_external_port = 6303 |
| cls.udp_port_in = 6304 |
| cls.udp_external_port = 6304 |
| cls.icmp_id_in = 6305 |
| cls.snat_addr = '10.0.0.3' |
| |
| cls.create_pg_interfaces(range(3)) |
| cls.interfaces = list(cls.pg_interfaces) |
| |
| for i in cls.interfaces: |
| i.admin_up() |
| 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_external_port)) |
| 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_external_port)) |
| 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_port_out, sport=self.tcp_external_port)) |
| 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_port_out, sport=self.udp_external_port)) |
| 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_port_out = packet[TCP].sport |
| elif packet.haslayer(UDP): |
| self.udp_port_out = 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_external_port, |
| 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_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.snat_addr) / |
| TCP(sport=self.tcp_external_port, dport=self.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=self.tcp_port_in, dport=self.tcp_external_port, |
| 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 verify_ipfix_max_entries_per_user(self, data): |
| """ |
| Verify IPFIX maximum entries per user exceeded event |
| |
| :param data: Decoded IPFIX data records |
| """ |
| self.assertEqual(1, len(data)) |
| record = data[0] |
| # natEvent |
| self.assertEqual(ord(record[230]), 13) |
| # natQuotaExceededEvent |
| self.assertEqual('\x03\x00\x00\x00', record[466]) |
| # sourceIPv4Address |
| self.assertEqual(self.pg0.remote_ip4n, record[8]) |
| |
| def test_deterministic_mode(self): |
| """ S-NAT run deterministic mode """ |
| in_addr = '172.16.255.0' |
| out_addr = '172.17.255.50' |
| in_addr_t = '172.16.255.20' |
| in_addr_n = socket.inet_aton(in_addr) |
| out_addr_n = socket.inet_aton(out_addr) |
| in_addr_t_n = socket.inet_aton(in_addr_t) |
| in_plen = 24 |
| out_plen = 32 |
| |
| snat_config = self.vapi.snat_show_config() |
| self.assertEqual(1, snat_config.deterministic) |
| |
| self.vapi.snat_add_det_map(in_addr_n, in_plen, out_addr_n, out_plen) |
| |
| rep1 = self.vapi.snat_det_forward(in_addr_t_n) |
| self.assertEqual(rep1.out_addr[:4], out_addr_n) |
| rep2 = self.vapi.snat_det_reverse(out_addr_n, rep1.out_port_hi) |
| self.assertEqual(rep2.in_addr[:4], in_addr_t_n) |
| |
| deterministic_mappings = self.vapi.snat_det_map_dump() |
| self.assertEqual(len(deterministic_mappings), 1) |
| dsm = deterministic_mappings[0] |
| self.assertEqual(in_addr_n, dsm.in_addr[:4]) |
| self.assertEqual(in_plen, dsm.in_plen) |
| self.assertEqual(out_addr_n, dsm.out_addr[:4]) |
| self.assertEqual(out_plen, dsm.out_plen) |
| |
| self.clear_snat() |
| deterministic_mappings = self.vapi.snat_det_map_dump() |
| self.assertEqual(len(deterministic_mappings), 0) |
| |
| def test_set_timeouts(self): |
| """ Set deterministic NAT timeouts """ |
| timeouts_before = self.vapi.snat_det_get_timeouts() |
| |
| self.vapi.snat_det_set_timeouts(timeouts_before.udp + 10, |
| timeouts_before.tcp_established + 10, |
| timeouts_before.tcp_transitory + 10, |
| timeouts_before.icmp + 10) |
| |
| timeouts_after = self.vapi.snat_det_get_timeouts() |
| |
| self.assertNotEqual(timeouts_before.udp, timeouts_after.udp) |
| self.assertNotEqual(timeouts_before.icmp, timeouts_after.icmp) |
| self.assertNotEqual(timeouts_before.tcp_established, |
| timeouts_after.tcp_established) |
| 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.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) |
| |
| # session dump test |
| sessions = self.vapi.snat_det_session_dump(self.pg0.remote_ip4n) |
| self.assertEqual(len(sessions), 3) |
| |
| # TCP session |
| s = sessions[0] |
| self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n) |
| self.assertEqual(s.in_port, self.tcp_port_in) |
| self.assertEqual(s.out_port, self.tcp_port_out) |
| self.assertEqual(s.ext_port, self.tcp_external_port) |
| |
| # UDP session |
| s = sessions[1] |
| self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n) |
| self.assertEqual(s.in_port, self.udp_port_in) |
| self.assertEqual(s.out_port, self.udp_port_out) |
| self.assertEqual(s.ext_port, self.udp_external_port) |
| |
| # ICMP session |
| s = sessions[2] |
| self.assertEqual(s.ext_addr[:4], self.pg1.remote_ip4n) |
| self.assertEqual(s.in_port, self.icmp_id_in) |
| self.assertEqual(s.out_port, self.icmp_external_id) |
| |
| def test_multiple_users(self): |
| """ CGNAT multiple users """ |
| |
| nat_ip = "10.0.0.10" |
| port_in = 80 |
| external_port = 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=external_port)) |
| 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, external_port) |
| port_out0 = 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=external_port)) |
| 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, external_port) |
| port_out1 = 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=external_port, dport=port_out0)) |
| 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, external_port) |
| 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=external_port, dport=port_out1)) |
| 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, external_port) |
| except: |
| self.logger.error(ppp("Unexpected or invalid packet", p)) |
| raise |
| |
| # session close api test |
| self.vapi.snat_det_close_session_out(socket.inet_aton(nat_ip), |
| port_out1, |
| self.pg1.remote_ip4n, |
| external_port) |
| dms = self.vapi.snat_det_map_dump() |
| self.assertEqual(dms[0].ses_num, 1) |
| |
| self.vapi.snat_det_close_session_in(host0.ip4n, |
| port_in, |
| self.pg1.remote_ip4n, |
| external_port) |
| dms = self.vapi.snat_det_map_dump() |
| self.assertEqual(dms[0].ses_num, 0) |
| |
| 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_external_port, |
| 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_external_port, dport=self.tcp_port_out, |
| 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_external_port, dport=self.tcp_port_out, |
| 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_external_port, |
| 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_external_port, dport=self.tcp_port_out, |
| 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_external_port, |
| 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_external_port, |
| 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_external_port, dport=self.tcp_port_out, |
| 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) |
| self.vapi.set_ipfix_exporter(collector_address=self.pg2.remote_ip4n, |
| src_address=self.pg2.local_ip4n, |
| path_mtu=512, |
| template_interval=10) |
| self.vapi.snat_ipfix() |
| |
| 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) |
| |
| # verify IPFIX logging |
| self.vapi.cli("ipfix flush") # FIXME this should be an API call |
| capture = self.pg2.get_capture(2) |
| ipfix = IPFIXDecoder() |
| # first load template |
| for p in capture: |
| self.assertTrue(p.haslayer(IPFIX)) |
| if p.haslayer(Template): |
| ipfix.add_template(p.getlayer(Template)) |
| # verify events in data set |
| for p in capture: |
| if p.haslayer(Data): |
| data = ipfix.decode_data_set(p.getlayer(Set)) |
| self.verify_ipfix_max_entries_per_user(data) |
| |
| def clear_snat(self): |
| """ |
| Clear SNAT configuration. |
| """ |
| self.vapi.snat_ipfix(enable=0) |
| self.vapi.snat_det_set_timeouts() |
| deterministic_mappings = self.vapi.snat_det_map_dump() |
| for dsm in deterministic_mappings: |
| self.vapi.snat_add_det_map(dsm.in_addr, |
| dsm.in_plen, |
| dsm.out_addr, |
| 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: |
| self.logger.info(self.vapi.cli("show snat detail")) |
| self.clear_snat() |
| |
| if __name__ == '__main__': |
| unittest.main(testRunner=VppTestRunner) |