class TestNAT44ED(NAT44EDTestCase):
""" NAT44ED Test Case """
+ def test_icmp_error(self):
+ """ NAT44ED test ICMP error message with inner header"""
+
+ payload = "H" * 10
+
+ self.nat_add_address(self.nat_addr)
+ self.nat_add_inside_interface(self.pg0)
+ self.nat_add_outside_interface(self.pg1)
+
+ # in2out (initiate connection)
+ p1 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
+ UDP(sport=21, dport=20) / payload)
+
+ self.pg0.add_stream(p1)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg1.get_capture(1)[0]
+
+ # out2in (send error message)
+ p2 = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
+ IP(src=self.pg1.remote_ip4, dst=self.nat_addr) /
+ ICMP(type='dest-unreach', code='port-unreachable') /
+ capture[IP:])
+
+ self.pg1.add_stream(p2)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ capture = self.pg0.get_capture(1)[0]
+
+ self.logger.info(ppp("p1 packet:", p1))
+ self.logger.info(ppp("p2 packet:", p2))
+ self.logger.info(ppp("capture packet:", capture))
+
+ def test_icmp_echo_reply_trailer(self):
+ """ ICMP echo reply with ethernet trailer"""
+
+ self.nat_add_address(self.nat_addr)
+ self.nat_add_inside_interface(self.pg0)
+ self.nat_add_outside_interface(self.pg1)
+
+ # in2out
+ p1 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
+ ICMP(type=8, id=0xabcd, seq=0))
+
+ self.pg0.add_stream(p1)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ c = self.pg1.get_capture(1)[0]
+
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ # out2in
+ p2 = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
+ IP(src=self.pg1.remote_ip4, dst=self.nat_addr, id=0xee59) /
+ ICMP(type=0, id=c[ICMP].id, seq=0))
+
+ # force checksum calculation
+ p2 = p2.__class__(bytes(p2))
+
+ self.logger.debug(ppp("Packet before modification:", p2))
+
+ # hex representation of vss monitoring ethernet trailer
+ # this seems to be just added to end of packet without modifying
+ # IP or ICMP lengths / checksums
+ p2 = p2 / Raw("\x00\x00\x52\x54\x00\x46\xab\x04\x84\x18")
+ # change it so that IP/ICMP is unaffected
+ p2[IP].len = 28
+
+ self.logger.debug(ppp("Packet with added trailer:", p2))
+
+ self.pg1.add_stream(p2)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+
+ self.pg0.get_capture(1)
+
def test_users_dump(self):
""" NAT44ED API test - nat44_user_dump """
self.pg_start()
capture = self.pg1.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
+ self.logger.debug(self.vapi.cli("show trace"))
# out2in
pkts = self.create_stream_out(self.pg1)
self.pg_start()
capture = self.pg0.get_capture(len(pkts))
self.verify_capture_in(capture, self.pg0)
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ # in2out
+ 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()
+ capture = self.pg1.get_capture(len(pkts))
+ self.verify_capture_out(capture, ignore_port=True)
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ # out2in
+ pkts = self.create_stream_out(self.pg1, ttl=2)
+ 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)
+ self.logger.debug(self.vapi.cli("show trace"))
+
+ # in2out
+ 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()
+ capture = self.pg0.get_capture(len(pkts))
+ for p in capture:
+ self.assertIn(ICMP, p)
+ self.assertEqual(p[ICMP].type, 11) # 11 == time-exceeded
def test_static_with_port_out2(self):
""" NAT44ED 1:1 NAPT asymmetrical rule """
self.nat_add_address(self.nat_addr)
self.vapi.nat44_interface_add_del_output_feature(
- sw_if_index=self.pg0.sw_if_index,
- flags=self.config_flags.NAT_IS_INSIDE, is_add=1)
- self.vapi.nat44_interface_add_del_output_feature(
- sw_if_index=self.pg1.sw_if_index,
- flags=self.config_flags.NAT_IS_OUTSIDE, is_add=1)
+ sw_if_index=self.pg1.sw_if_index, is_add=1)
# First ensure that the NAT is working sans ACL
new_vrf_id = 22
self.nat_add_address(self.nat_addr)
- flags = self.config_flags.NAT_IS_INSIDE
self.vapi.nat44_interface_add_del_output_feature(
- sw_if_index=self.pg7.sw_if_index,
- flags=flags, is_add=1)
- self.vapi.nat44_interface_add_del_output_feature(
- sw_if_index=self.pg8.sw_if_index,
- is_add=1)
+ sw_if_index=self.pg8.sw_if_index, is_add=1)
try:
self.configure_ip4_interface(self.pg7, table_id=new_vrf_id)
capture = self.pg8.get_capture(len(pkts))
self.verify_capture_out(capture, ignore_port=True)
- if_idx = self.pg7.sw_if_index
+ if_idx = self.pg8.sw_if_index
cnt = self.statistics['/nat44-ed/in2out/slowpath/tcp']
self.assertEqual(cnt[:, if_idx].sum() - tcpn[:, if_idx].sum(), 2)
cnt = self.statistics['/nat44-ed/in2out/slowpath/udp']
self.logger.error(ppp("Unexpected or invalid packet:", p))
raise
+ def test_icmp_error_fwd_outbound(self):
+ """ NAT44ED ICMP error outbound with forwarding enabled """
+
+ # Ensure that an outbound ICMP error message is properly associated
+ # with the inbound forward bypass session it is related to.
+ payload = "H" * 10
+
+ self.nat_add_address(self.nat_addr)
+ self.nat_add_inside_interface(self.pg0)
+ self.nat_add_outside_interface(self.pg1)
+
+ # enable forwarding and initiate connection out2in
+ self.vapi.nat44_forwarding_enable_disable(enable=1)
+ p1 = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) /
+ IP(src=self.pg1.remote_ip4, dst=self.pg0.remote_ip4) /
+ UDP(sport=21, dport=20) / payload)
+
+ self.pg1.add_stream(p1)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg0.get_capture(1)[0]
+
+ self.logger.info(self.vapi.cli("show nat44 sessions"))
+
+ # reply with ICMP error message in2out
+ # We cannot reliably retrieve forward bypass sessions via the API.
+ # session dumps for a user will only look on the worker that the
+ # user is supposed to be mapped to in2out. The forward bypass session
+ # is not necessarily created on that worker.
+ p2 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
+ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4) /
+ ICMP(type='dest-unreach', code='port-unreachable') /
+ capture[IP:])
+
+ self.pg0.add_stream(p2)
+ self.pg_enable_capture(self.pg_interfaces)
+ self.pg_start()
+ capture = self.pg1.get_capture(1)[0]
+
+ self.logger.info(self.vapi.cli("show nat44 sessions"))
+
+ self.logger.info(ppp("p1 packet:", p1))
+ self.logger.info(ppp("p2 packet:", p2))
+ self.logger.info(ppp("capture packet:", capture))
+
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)