#!/usr/bin/env python import socket import unittest import struct from framework import VppTestCase, VppTestRunner 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 class TestSNAT(VppTestCase): """ 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 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]) 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): """ 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) 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 respones 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 respones 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_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) # 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) 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 tearDown(self): super(TestSNAT, self).tearDown() if not self.vpp_dead: self.logger.info(self.vapi.cli("show snat verbose")) self.clear_snat() if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)