make test: add S-NAT plugin tests

Change-Id: I7859f63c5b28480be1ae587fc923d15212769e66
Signed-off-by: Matus Fabian <matfabia@cisco.com>

2 files changed, 623 insertions, 0 deletions

diff --git a/test/test_snat.py b/test/test_snat.py
new file mode 100644
index 00000000..e90d9c0b
--- /dev/null
+++ b/test/test_snat.py
@@ -0,0 +1,536 @@
+#!/usr/bin/env python
+
+import socket
+import unittest
+from logging import *
+
+from framework import VppTestCase, VppTestRunner
+
+from scapy.layers.inet import IP, TCP, UDP, ICMP
+from scapy.layers.l2 import Ether
+
+
+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(7))
+            cls.interfaces = list(cls.pg_interfaces[0:4])
+
+            for i in cls.interfaces:
+                i.admin_up()
+                i.config_ip4()
+                i.resolve_arp()
+
+            cls.overlapping_interfaces = list(list(cls.pg_interfaces[4:7]))
+
+            for i in cls.overlapping_interfaces:
+                i._local_ip4 = "172.16.255.1"
+                i._local_ip4n = socket.inet_pton(socket.AF_INET, i.local_ip4)
+                i._remote_hosts[0]._ip4 = "172.16.255.2"
+                i.set_table_ip4(i.sw_if_index)
+                i.config_ip4()
+                i.admin_up()
+                i.resolve_arp()
+
+        except Exception:
+            super(TestSNAT, cls).tearDownClass()
+            raise
+
+    def create_stream_in(self, in_if, out_if):
+        """
+        Create packet stream for inside network
+
+        :param in_if: Inside interface
+        :param out_if: Outside interface
+        """
+        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) /
+             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) /
+             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) /
+             ICMP(id=self.icmp_id_in, type='echo-request'))
+        pkts.append(p)
+
+        return pkts
+
+    def create_stream_out(self, out_if, dst_ip=None):
+        """
+        Create packet stream for outside network
+
+        :param out_if: Outside interface
+        :param dst_ip: Destination IP address (Default use global SNAT address)
+        """
+        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) /
+             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) /
+             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) /
+             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:
+                error("Unexpected or invalid packet (outside network):")
+                error(packet.show())
+                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:
+                error("Unexpected or invalid packet (inside network):")
+                error(packet.show())
+                raise
+
+    def clear_snat(self):
+        """
+        Clear SNAT configuration.
+        """
+        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,
+                                              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, local_port=0,
+                                external_port=0, vrf_id=0, is_add=1):
+        """
+        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)
+        """
+        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, local_port, external_port,
+                                          addr_only, vrf_id, 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()
+        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()
+        self.verify_capture_in(capture, self.pg0)
+
+    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()
+        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()
+        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()
+        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()
+        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)
+        self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr,
+                                     self.udp_port_in, self.udp_port_out)
+        self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr,
+                                     self.icmp_id_in, self.icmp_id_out)
+        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()
+        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()
+        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)
+        self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr,
+                                     self.udp_port_in, self.udp_port_out)
+        self.snat_add_static_mapping(self.pg0.remote_ip4, self.snat_addr,
+                                     self.icmp_id_in, self.icmp_id_out)
+        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()
+        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()
+        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=self.pg4.sw_if_index)
+        self.snat_add_static_mapping(self.pg0.remote_ip4, nat_ip2,
+                                     vrf_id=self.pg4.sw_if_index)
+        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()
+        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()
+        capture = self.pg3.get_capture()
+        self.verify_capture_out(capture, packet_num=0)
+
+    def test_multiple_inside_interfaces(self):
+        """ SNAT multiple inside interfaces with 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.pg2.sw_if_index)
+        self.vapi.snat_interface_add_del_feature(self.pg3.sw_if_index,
+                                                 is_inside=0)
+
+        # 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()
+        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()
+        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()
+        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()
+        self.verify_capture_in(capture, self.pg1)
+
+        # in2out 3rd interface
+        pkts = self.create_stream_in(self.pg2, self.pg3)
+        self.pg2.add_stream(pkts)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+        capture = self.pg3.get_capture()
+        self.verify_capture_out(capture)
+
+        # out2in 3rd 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.pg2.get_capture()
+        self.verify_capture_in(capture, self.pg2)
+
+    def test_inside_overlapping_interfaces(self):
+        """ SNAT multiple inside interfaces with overlapping address space """
+
+        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)
+
+        # 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()
+        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()
+        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()
+        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()
+        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()
+        self.verify_capture_out(capture)
+
+        # out2in 3rd 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.pg6.get_capture()
+        self.verify_capture_in(capture, self.pg6)
+
+    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)
diff --git a/test/vpp_papi_provider.py b/test/vpp_papi_provider.py
index cd4601e3..2f931803 100644
--- a/test/vpp_papi_provider.py
+++ b/test/vpp_papi_provider.py
@@ -709,3 +709,90 @@ class VppPapiProvider(object):
 
         return self.api(vpp_papi.sw_interface_span_enable_disable,
                         (sw_if_index_from, sw_if_index_to, enable))
+
+    def snat_interface_add_del_feature(
+            self,
+            sw_if_index,
+            is_inside=1,
+            is_add=1):
+        """Enable/disable S-NAT feature on the interface
+
+        :param sw_if_index: Software index of the interface
+        :param is_inside: 1 if inside, 0 if outside (Default value = 1)
+        :param is_add: 1 if add, 0 if delete (Default value = 1)
+        """
+        return self.api(
+            self.papi.snat_interface_add_del_feature,
+            {'is_add' : is_add,
+             'is_inside' : is_inside,
+             'sw_if_index' : sw_if_index})
+
+    def snat_add_static_mapping(
+            self,
+            local_ip,
+            external_ip,
+            local_port=0,
+            external_port=0,
+            addr_only=1,
+            vrf_id=0,
+            is_add=1,
+            is_ip4=1):
+        """Add/delete S-NAT static mapping
+
+        :param local_ip: Local IP address
+        :param external_ip: External IP address
+        :param local_port: Local port number (Default value = 0)
+        :param external_port: External port number (Default value = 0)
+        :param addr_only: 1 if address only mapping, 0 if address and port
+        :param vrf_id: VRF ID
+        :param is_add: 1 if add, 0 if delete (Default value = 1)
+        :param is_ip4: 1 if address type is IPv4 (Default value = 1)
+        """
+        return self.api(
+            self.papi.snat_add_static_mapping,
+            {'is_add' : is_add,
+             'is_ip4' : is_ip4,
+             'addr_only' : addr_only,
+             'local_ip_address' : local_ip,
+             'external_ip_address' : external_ip,
+             'local_port' : local_port,
+             'external_port' : external_port,
+             'vrf_id' : vrf_id})
+
+    def snat_add_address_range(
+            self,
+            first_ip_address,
+            last_ip_address,
+            is_add=1,
+            is_ip4=1):
+        """Add/del S-NAT address range
+
+        :param first_ip_address: First IP address
+        :param last_ip_address: Last IP address
+        :param is_add: 1 if add, 0 if delete (Default value = 1)
+        :param is_ip4: 1 if address type is IPv4 (Default value = 1)
+        """
+        return self.api(
+            self.papi.snat_add_address_range,
+            {'is_ip4' : is_ip4,
+             'first_ip_address' : first_ip_address,
+             'last_ip_address' : last_ip_address,
+             'is_add' : is_add})
+
+    def snat_address_dump(self):
+        """Dump S-NAT addresses
+        :return: Dictionary of S-NAT addresses
+        """
+        return self.api(self.papi.snat_address_dump, {})
+
+    def snat_interface_dump(self):
+        """Dump interfaces with S-NAT feature
+        :return: Dictionary of interfaces with S-NAT feature
+        """
+        return self.api(self.papi.snat_interface_dump, {})
+
+    def snat_static_mapping_dump(self):
+        """Dump S-NAT static mappings
+        :return: Dictionary of S-NAT static mappings
+        """
+        return self.api(self.papi.snat_static_mapping_dump, {})