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-rw-r--r--test/test_cnat.py975
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diff --git a/test/test_cnat.py b/test/test_cnat.py
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+++ b/test/test_cnat.py
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+#!/usr/bin/env python3
+
+import unittest
+
+from framework import VppTestCase, VppTestRunner
+from vpp_ip import DpoProto, INVALID_INDEX
+from itertools import product
+
+from scapy.packet import Raw
+from scapy.layers.l2 import Ether
+from scapy.layers.inet import IP, UDP, TCP, ICMP
+from scapy.layers.inet import IPerror, TCPerror, UDPerror, ICMPerror
+from scapy.layers.inet6 import IPv6, IPerror6, ICMPv6DestUnreach
+from scapy.layers.inet6 import ICMPv6EchoRequest, ICMPv6EchoReply
+
+import struct
+
+from ipaddress import ip_address, ip_network, \
+ IPv4Address, IPv6Address, IPv4Network, IPv6Network
+
+from vpp_object import VppObject
+from vpp_papi import VppEnum
+
+N_PKTS = 15
+
+
+class Ep(object):
+ """ CNat endpoint """
+
+ def __init__(self, ip=None, port=0, l4p=TCP,
+ sw_if_index=INVALID_INDEX, is_v6=False):
+ self.ip = ip
+ if ip is None:
+ self.ip = "::" if is_v6 else "0.0.0.0"
+ self.port = port
+ self.l4p = l4p
+ self.sw_if_index = sw_if_index
+ if is_v6:
+ self.if_af = VppEnum.vl_api_address_family_t.ADDRESS_IP6
+ else:
+ self.if_af = VppEnum.vl_api_address_family_t.ADDRESS_IP4
+
+ def encode(self):
+ return {'addr': self.ip,
+ 'port': self.port,
+ 'sw_if_index': self.sw_if_index,
+ 'if_af': self.if_af}
+
+ @classmethod
+ def from_pg(cls, pg, is_v6=False):
+ if pg is None:
+ return cls(is_v6=is_v6)
+ else:
+ return cls(sw_if_index=pg.sw_if_index, is_v6=is_v6)
+
+ @property
+ def isV6(self):
+ return ":" in self.ip
+
+ def __str__(self):
+ return ("%s:%d" % (self.ip, self.port))
+
+
+class EpTuple(object):
+ """ CNat endpoint """
+
+ def __init__(self, src, dst):
+ self.src = src
+ self.dst = dst
+
+ def encode(self):
+ return {'src_ep': self.src.encode(),
+ 'dst_ep': self.dst.encode()}
+
+ def __str__(self):
+ return ("%s->%s" % (self.src, self.dst))
+
+
+class VppCNatTranslation(VppObject):
+
+ def __init__(self, test, iproto, vip, paths):
+ self._test = test
+ self.vip = vip
+ self.iproto = iproto
+ self.paths = paths
+ self.encoded_paths = []
+ for path in self.paths:
+ self.encoded_paths.append(path.encode())
+
+ def __str__(self):
+ return ("%s %s %s" % (self.vip, self.iproto, self.paths))
+
+ @property
+ def vl4_proto(self):
+ ip_proto = VppEnum.vl_api_ip_proto_t
+ return {
+ UDP: ip_proto.IP_API_PROTO_UDP,
+ TCP: ip_proto.IP_API_PROTO_TCP,
+ }[self.iproto]
+
+ def add_vpp_config(self):
+ r = self._test.vapi.cnat_translation_update(
+ {'vip': self.vip.encode(),
+ 'ip_proto': self.vl4_proto,
+ 'n_paths': len(self.paths),
+ 'paths': self.encoded_paths})
+ self._test.registry.register(self, self._test.logger)
+ self.id = r.id
+
+ def modify_vpp_config(self, paths):
+ self.paths = paths
+ self.encoded_paths = []
+ for path in self.paths:
+ self.encoded_paths.append(path.encode())
+
+ r = self._test.vapi.cnat_translation_update(
+ {'vip': self.vip.encode(),
+ 'ip_proto': self.vl4_proto,
+ 'n_paths': len(self.paths),
+ 'paths': self.encoded_paths})
+ self._test.registry.register(self, self._test.logger)
+
+ def remove_vpp_config(self):
+ self._test.vapi.cnat_translation_del(id=self.id)
+
+ def query_vpp_config(self):
+ for t in self._test.vapi.cnat_translation_dump():
+ if self.id == t.translation.id:
+ return t.translation
+ return None
+
+ def object_id(self):
+ return ("cnat-translation-%s" % (self.vip))
+
+ def get_stats(self):
+ c = self._test.statistics.get_counter("/net/cnat-translation")
+ return c[0][self.id]
+
+
+class TestCNatTranslation(VppTestCase):
+ """ CNat Translation """
+ extra_vpp_punt_config = ["cnat", "{",
+ "session-db-buckets", "64",
+ "session-cleanup-timeout", "0.1",
+ "session-max-age", "1",
+ "tcp-max-age", "1",
+ "scanner", "off", "}"]
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestCNatTranslation, cls).setUpClass()
+
+ @classmethod
+ def tearDownClass(cls):
+ super(TestCNatTranslation, cls).tearDownClass()
+
+ def setUp(self):
+ super(TestCNatTranslation, self).setUp()
+
+ self.create_pg_interfaces(range(3))
+
+ for i in self.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+ i.config_ip6()
+ i.resolve_ndp()
+
+ def tearDown(self):
+ for i in self.pg_interfaces:
+ i.unconfig_ip4()
+ i.unconfig_ip6()
+ i.admin_down()
+ super(TestCNatTranslation, self).tearDown()
+
+ def cnat_create_translation(self, vip, nbr):
+ ip_v = "ip6" if vip.isV6 else "ip4"
+ dep = Ep(getattr(self.pg1.remote_hosts[nbr], ip_v), 4000 + nbr)
+ sep = Ep("::", 0) if vip.isV6 else Ep("0.0.0.0", 0)
+ t1 = VppCNatTranslation(
+ self, vip.l4p, vip,
+ [EpTuple(sep, dep), EpTuple(sep, dep)])
+ t1.add_vpp_config()
+ return t1
+
+ def cnat_test_translation(self, t1, nbr, sports, isV6=False):
+ ip_v = "ip6" if isV6 else "ip4"
+ ip_class = IPv6 if isV6 else IP
+ vip = t1.vip
+
+ #
+ # Flows
+ #
+ for src in self.pg0.remote_hosts:
+ for sport in sports:
+ # from client to vip
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=src.mac) /
+ ip_class(src=getattr(src, ip_v), dst=vip.ip) /
+ vip.l4p(sport=sport, dport=vip.port) /
+ Raw())
+
+ self.vapi.cli("trace add pg-input 1")
+ rxs = self.send_and_expect(self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+ self.logger.info(self.vapi.cli("show trace max 1"))
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(
+ rx[ip_class].dst,
+ getattr(self.pg1.remote_hosts[nbr], ip_v))
+ self.assertEqual(rx[vip.l4p].dport, 4000 + nbr)
+ self.assertEqual(
+ rx[ip_class].src,
+ getattr(src, ip_v))
+ self.assertEqual(rx[vip.l4p].sport, sport)
+
+ # from vip to client
+ p1 = (Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_mac) /
+ ip_class(src=getattr(
+ self.pg1.remote_hosts[nbr],
+ ip_v),
+ dst=getattr(src, ip_v)) /
+ vip.l4p(sport=4000 + nbr, dport=sport) /
+ Raw())
+
+ rxs = self.send_and_expect(self.pg1,
+ p1 * N_PKTS,
+ self.pg0)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(
+ rx[ip_class].dst,
+ getattr(src, ip_v))
+ self.assertEqual(rx[vip.l4p].dport, sport)
+ self.assertEqual(rx[ip_class].src, vip.ip)
+ self.assertEqual(rx[vip.l4p].sport, vip.port)
+
+ #
+ # packets to the VIP that do not match a
+ # translation are dropped
+ #
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=src.mac) /
+ ip_class(src=getattr(src, ip_v), dst=vip.ip) /
+ vip.l4p(sport=sport, dport=6666) /
+ Raw())
+
+ self.send_and_assert_no_replies(self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ #
+ # packets from the VIP that do not match a
+ # session are forwarded
+ #
+ p1 = (Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_mac) /
+ ip_class(src=getattr(
+ self.pg1.remote_hosts[nbr],
+ ip_v),
+ dst=getattr(src, ip_v)) /
+ vip.l4p(sport=6666, dport=sport) /
+ Raw())
+
+ rxs = self.send_and_expect(self.pg1,
+ p1 * N_PKTS,
+ self.pg0)
+
+ def cnat_test_translation_update(self, t1, sports, isV6=False):
+ ip_v = "ip6" if isV6 else "ip4"
+ ip_class = IPv6 if isV6 else IP
+ vip = t1.vip
+
+ #
+ # modify the translation to use a different backend
+ #
+ dep = Ep(getattr(self.pg2, 'remote_' + ip_v), 5000)
+ sep = Ep("::", 0) if isV6 else Ep("0.0.0.0", 0)
+ t1.modify_vpp_config([EpTuple(sep, dep)])
+
+ #
+ # existing flows follow the old path
+ #
+ for src in self.pg0.remote_hosts:
+ for sport in sports:
+ # from client to vip
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=src.mac) /
+ ip_class(src=getattr(src, ip_v), dst=vip.ip) /
+ vip.l4p(sport=sport, dport=vip.port) /
+ Raw())
+
+ rxs = self.send_and_expect(self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ #
+ # new flows go to the new backend
+ #
+ for src in self.pg0.remote_hosts:
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=src.mac) /
+ ip_class(src=getattr(src, ip_v), dst=vip.ip) /
+ vip.l4p(sport=9999, dport=vip.port) /
+ Raw())
+
+ rxs = self.send_and_expect(self.pg0,
+ p1 * N_PKTS,
+ self.pg2)
+
+ def cnat_translation(self, vips, isV6=False):
+ """ CNat Translation """
+
+ ip_class = IPv6 if isV6 else IP
+ ip_v = "ip6" if isV6 else "ip4"
+ sports = [1234, 1233]
+
+ #
+ # turn the scanner off whilst testing otherwise sessions
+ # will time out
+ #
+ self.vapi.cli("test cnat scanner off")
+
+ sessions = self.vapi.cnat_session_dump()
+
+ trs = []
+ for nbr, vip in enumerate(vips):
+ trs.append(self.cnat_create_translation(vip, nbr))
+
+ self.logger.info(self.vapi.cli("sh cnat client"))
+ self.logger.info(self.vapi.cli("sh cnat translation"))
+
+ #
+ # translations
+ #
+ for nbr, vip in enumerate(vips):
+ self.cnat_test_translation(trs[nbr], nbr, sports, isV6=isV6)
+ self.cnat_test_translation_update(trs[nbr], sports, isV6=isV6)
+ if isV6:
+ self.logger.info(self.vapi.cli(
+ "sh ip6 fib %s" % self.pg0.remote_ip6))
+ else:
+ self.logger.info(self.vapi.cli(
+ "sh ip fib %s" % self.pg0.remote_ip4))
+ self.logger.info(self.vapi.cli("sh cnat session verbose"))
+
+ #
+ # turn the scanner back on and wait until the sessions
+ # all disapper
+ #
+ self.vapi.cli("test cnat scanner on")
+
+ n_tries = 0
+ sessions = self.vapi.cnat_session_dump()
+ while (len(sessions) and n_tries < 100):
+ n_tries += 1
+ sessions = self.vapi.cnat_session_dump()
+ self.sleep(2)
+ self.logger.info(self.vapi.cli("show cnat session verbose"))
+
+ self.assertTrue(n_tries < 100)
+ self.vapi.cli("test cnat scanner off")
+
+ #
+ # load some flows again and purge
+ #
+ for vip in vips:
+ for src in self.pg0.remote_hosts:
+ for sport in sports:
+ # from client to vip
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=src.mac) /
+ ip_class(src=getattr(src, ip_v), dst=vip.ip) /
+ vip.l4p(sport=sport, dport=vip.port) /
+ Raw())
+ self.send_and_expect(self.pg0,
+ p1 * N_PKTS,
+ self.pg2)
+
+ for tr in trs:
+ tr.remove_vpp_config()
+
+ self.assertTrue(self.vapi.cnat_session_dump())
+ self.vapi.cnat_session_purge()
+ self.assertFalse(self.vapi.cnat_session_dump())
+
+ def test_icmp(self):
+ vips = [
+ Ep("30.0.0.1", 5555),
+ Ep("30.0.0.2", 5554),
+ Ep("30.0.0.2", 5553, UDP),
+ Ep("30::1", 6666),
+ Ep("30::2", 5553, UDP),
+ ]
+ sport = 1234
+
+ self.pg0.generate_remote_hosts(len(vips))
+ self.pg0.configure_ipv6_neighbors()
+ self.pg0.configure_ipv4_neighbors()
+
+ self.pg1.generate_remote_hosts(len(vips))
+ self.pg1.configure_ipv6_neighbors()
+ self.pg1.configure_ipv4_neighbors()
+
+ self.vapi.cli("test cnat scanner off")
+ trs = []
+ for nbr, vip in enumerate(vips):
+ trs.append(self.cnat_create_translation(vip, nbr))
+
+ self.logger.info(self.vapi.cli("sh cnat client"))
+ self.logger.info(self.vapi.cli("sh cnat translation"))
+
+ for nbr, vip in enumerate(vips):
+ if vip.isV6:
+ client_addr = self.pg0.remote_hosts[0].ip6
+ remote_addr = self.pg1.remote_hosts[nbr].ip6
+ remote2_addr = self.pg2.remote_hosts[0].ip6
+ else:
+ client_addr = self.pg0.remote_hosts[0].ip4
+ remote_addr = self.pg1.remote_hosts[nbr].ip4
+ remote2_addr = self.pg2.remote_hosts[0].ip4
+ IP46 = IPv6 if vip.isV6 else IP
+ # from client to vip
+ p1 = (Ether(dst=self.pg0.local_mac,
+ src=self.pg0.remote_hosts[0].mac) /
+ IP46(src=client_addr, dst=vip.ip) /
+ vip.l4p(sport=sport, dport=vip.port) /
+ Raw())
+
+ rxs = self.send_and_expect(self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, remote_addr)
+ self.assertEqual(rx[vip.l4p].dport, 4000 + nbr)
+ self.assertEqual(rx[IP46].src, client_addr)
+ self.assertEqual(rx[vip.l4p].sport, sport)
+
+ InnerIP = rxs[0][IP46]
+
+ ICMP46 = ICMPv6DestUnreach if vip.isV6 else ICMP
+ ICMPelem = ICMPv6DestUnreach(code=1) if vip.isV6 else ICMP(type=11)
+ # from vip to client, ICMP error
+ p1 = (Ether(dst=self.pg1.local_mac, src=self.pg1.remote_mac) /
+ IP46(src=remote_addr, dst=client_addr) /
+ ICMPelem / InnerIP)
+
+ rxs = self.send_and_expect(self.pg1,
+ p1 * N_PKTS,
+ self.pg0)
+
+ TCPUDPError = TCPerror if vip.l4p == TCP else UDPerror
+ IP46error = IPerror6 if vip.isV6 else IPerror
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].src, vip.ip)
+ self.assertEqual(rx[ICMP46][IP46error].src, client_addr)
+ self.assertEqual(rx[ICMP46][IP46error].dst, vip.ip)
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPUDPError].sport, sport)
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPUDPError].dport, vip.port)
+
+ # from other remote to client, ICMP error
+ # outside shouldn't be NAT-ed
+ p1 = (Ether(dst=self.pg2.local_mac, src=self.pg2.remote_mac) /
+ IP46(src=remote2_addr, dst=client_addr) /
+ ICMPelem / InnerIP)
+
+ rxs = self.send_and_expect(self.pg1,
+ p1 * N_PKTS,
+ self.pg0)
+
+ TCPUDPError = TCPerror if vip.l4p == TCP else UDPerror
+ IP46error = IPerror6 if vip.isV6 else IPerror
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].src, remote2_addr)
+ self.assertEqual(rx[ICMP46][IP46error].src, client_addr)
+ self.assertEqual(rx[ICMP46][IP46error].dst, vip.ip)
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPUDPError].sport, sport)
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPUDPError].dport, vip.port)
+
+ self.vapi.cnat_session_purge()
+
+ def test_cnat6(self):
+ # """ CNat Translation ipv6 """
+ vips = [
+ Ep("30::1", 5555),
+ Ep("30::2", 5554),
+ Ep("30::2", 5553, UDP),
+ ]
+
+ self.pg0.generate_remote_hosts(len(vips))
+ self.pg0.configure_ipv6_neighbors()
+ self.pg1.generate_remote_hosts(len(vips))
+ self.pg1.configure_ipv6_neighbors()
+
+ self.cnat_translation(vips, isV6=True)
+
+ def test_cnat4(self):
+ # """ CNat Translation ipv4 """
+
+ vips = [
+ Ep("30.0.0.1", 5555),
+ Ep("30.0.0.2", 5554),
+ Ep("30.0.0.2", 5553, UDP),
+ ]
+
+ self.pg0.generate_remote_hosts(len(vips))
+ self.pg0.configure_ipv4_neighbors()
+ self.pg1.generate_remote_hosts(len(vips))
+ self.pg1.configure_ipv4_neighbors()
+
+ self.cnat_translation(vips)
+
+
+class TestCNatSourceNAT(VppTestCase):
+ """ CNat Source NAT """
+ extra_vpp_punt_config = ["cnat", "{",
+ "session-cleanup-timeout", "0.1",
+ "session-max-age", "1",
+ "tcp-max-age", "1",
+ "scanner", "off", "}"]
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestCNatSourceNAT, cls).setUpClass()
+
+ @classmethod
+ def tearDownClass(cls):
+ super(TestCNatSourceNAT, cls).tearDownClass()
+
+ def setUp(self):
+ super(TestCNatSourceNAT, self).setUp()
+
+ self.create_pg_interfaces(range(3))
+
+ for i in self.pg_interfaces:
+ i.admin_up()
+ i.config_ip4()
+ i.resolve_arp()
+ i.config_ip6()
+ i.resolve_ndp()
+
+ self.pg0.configure_ipv6_neighbors()
+ self.pg0.configure_ipv4_neighbors()
+ self.pg1.generate_remote_hosts(2)
+ self.pg1.configure_ipv4_neighbors()
+ self.pg1.configure_ipv6_neighbors()
+
+ self.vapi.cnat_set_snat_addresses(
+ snat_ip4=self.pg2.remote_hosts[0].ip4,
+ snat_ip6=self.pg2.remote_hosts[0].ip6,
+ sw_if_index=INVALID_INDEX)
+ self.vapi.feature_enable_disable(
+ enable=1,
+ arc_name="ip6-unicast",
+ feature_name="cnat-snat-ip6",
+ sw_if_index=self.pg0.sw_if_index)
+ self.vapi.feature_enable_disable(
+ enable=1,
+ arc_name="ip4-unicast",
+ feature_name="cnat-snat-ip4",
+ sw_if_index=self.pg0.sw_if_index)
+
+ policie_tbls = VppEnum.vl_api_cnat_snat_policy_table_t
+ self.vapi.cnat_set_snat_policy(
+ policy=VppEnum.vl_api_cnat_snat_policies_t.CNAT_POLICY_IF_PFX)
+ for i in self.pg_interfaces:
+ self.vapi.cnat_snat_policy_add_del_if(
+ sw_if_index=i.sw_if_index, is_add=1,
+ table=policie_tbls.CNAT_POLICY_INCLUDE_V6)
+ self.vapi.cnat_snat_policy_add_del_if(
+ sw_if_index=i.sw_if_index, is_add=1,
+ table=policie_tbls.CNAT_POLICY_INCLUDE_V4)
+
+ def tearDown(self):
+ self.vapi.cnat_session_purge()
+ for i in self.pg_interfaces:
+ i.unconfig_ip4()
+ i.unconfig_ip6()
+ i.admin_down()
+ super(TestCNatSourceNAT, self).tearDown()
+
+ def test_snat_v6(self):
+ # """ CNat Source Nat v6 """
+ self.sourcenat_test_tcp_udp_conf(TCP, isV6=True)
+ self.sourcenat_test_tcp_udp_conf(UDP, isV6=True)
+ self.sourcenat_test_icmp_err_conf(isV6=True)
+ self.sourcenat_test_icmp_echo6_conf()
+
+ def test_snat_v4(self):
+ # """ CNat Source Nat v4 """
+ self.sourcenat_test_tcp_udp_conf(TCP)
+ self.sourcenat_test_tcp_udp_conf(UDP)
+ self.sourcenat_test_icmp_err_conf()
+ self.sourcenat_test_icmp_echo4_conf()
+
+ def sourcenat_test_icmp_echo6_conf(self):
+ sports = [1234, 1235]
+ dports = [6661, 6662]
+
+ for nbr, remote_host in enumerate(self.pg1.remote_hosts):
+ client_addr = self.pg0.remote_hosts[0].ip6
+ remote_addr = self.pg1.remote_hosts[nbr].ip6
+ src_nat_addr = self.pg2.remote_hosts[0].ip6
+
+ # ping from pods to outside network
+ p1 = (
+ Ether(dst=self.pg0.local_mac,
+ src=self.pg0.remote_hosts[0].mac) /
+ IPv6(src=client_addr, dst=remote_addr) /
+ ICMPv6EchoRequest(id=0xfeed) /
+ Raw())
+
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ for rx in rxs:
+ self.assertEqual(rx[IPv6].src, src_nat_addr)
+ self.assert_packet_checksums_valid(rx)
+
+ received_id = rx[0][ICMPv6EchoRequest].id
+ # ping reply from outside to pods
+ p2 = (
+ Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_hosts[nbr].mac) /
+ IPv6(src=remote_addr, dst=src_nat_addr) /
+ ICMPv6EchoReply(id=received_id))
+ rxs = self.send_and_expect(
+ self.pg1,
+ p2 * N_PKTS,
+ self.pg0)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IPv6].src, remote_addr)
+ self.assertEqual(rx[ICMPv6EchoReply].id, 0xfeed)
+
+ def sourcenat_test_icmp_echo4_conf(self):
+ sports = [1234, 1235]
+ dports = [6661, 6662]
+
+ for nbr, remote_host in enumerate(self.pg1.remote_hosts):
+ IP46 = IP
+ client_addr = self.pg0.remote_hosts[0].ip4
+ remote_addr = self.pg1.remote_hosts[nbr].ip4
+ src_nat_addr = self.pg2.remote_hosts[0].ip4
+
+ # ping from pods to outside network
+ p1 = (
+ Ether(dst=self.pg0.local_mac,
+ src=self.pg0.remote_hosts[0].mac) /
+ IP46(src=client_addr, dst=remote_addr) /
+ ICMP(type=8, id=0xfeed) /
+ Raw())
+
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ for rx in rxs:
+ self.assertEqual(rx[IP46].src, src_nat_addr)
+ self.assert_packet_checksums_valid(rx)
+
+ received_id = rx[0][ICMP].id
+ # ping reply from outside to pods
+ p2 = (
+ Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_hosts[nbr].mac) /
+ IP46(src=remote_addr, dst=src_nat_addr) /
+ ICMP(type=0, id=received_id))
+ rxs = self.send_and_expect(
+ self.pg1,
+ p2 * N_PKTS,
+ self.pg0)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].src, remote_addr)
+ self.assertEqual(rx[ICMP].id, 0xfeed)
+
+ def sourcenat_test_icmp_err_conf(self, isV6=False):
+ sports = [1234, 1235]
+ dports = [6661, 6662]
+
+ for nbr, remote_host in enumerate(self.pg1.remote_hosts):
+ if isV6:
+ IP46 = IPv6
+ client_addr = self.pg0.remote_hosts[0].ip6
+ remote_addr = self.pg1.remote_hosts[nbr].ip6
+ src_nat_addr = self.pg2.remote_hosts[0].ip6
+ ICMP46 = ICMPv6DestUnreach
+ ICMPelem = ICMPv6DestUnreach(code=1)
+ IP46error = IPerror6
+ else:
+ IP46 = IP
+ client_addr = self.pg0.remote_hosts[0].ip4
+ remote_addr = self.pg1.remote_hosts[nbr].ip4
+ src_nat_addr = self.pg2.remote_hosts[0].ip4
+ IP46error = IPerror
+ ICMP46 = ICMP
+ ICMPelem = ICMP(type=11)
+
+ # from pods to outside network
+ p1 = (
+ Ether(dst=self.pg0.local_mac,
+ src=self.pg0.remote_hosts[0].mac) /
+ IP46(src=client_addr, dst=remote_addr) /
+ TCP(sport=sports[nbr], dport=dports[nbr]) /
+ Raw())
+
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, remote_addr)
+ self.assertEqual(rx[TCP].dport, dports[nbr])
+ self.assertEqual(rx[IP46].src, src_nat_addr)
+ sport = rx[TCP].sport
+
+ InnerIP = rxs[0][IP46]
+ # from outside to pods, ICMP error
+ p2 = (
+ Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_hosts[nbr].mac) /
+ IP46(src=remote_addr, dst=src_nat_addr) /
+ ICMPelem / InnerIP)
+
+ rxs = self.send_and_expect(
+ self.pg1,
+ p2 * N_PKTS,
+ self.pg0)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].src, remote_addr)
+ self.assertEqual(rx[ICMP46][IP46error].src, client_addr)
+ self.assertEqual(rx[ICMP46][IP46error].dst, remote_addr)
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPerror].sport, sports[nbr])
+ self.assertEqual(rx[ICMP46][IP46error]
+ [TCPerror].dport, dports[nbr])
+
+ def sourcenat_test_tcp_udp_conf(self, l4p, isV6=False):
+ sports = [1234, 1235]
+ dports = [6661, 6662]
+
+ for nbr, remote_host in enumerate(self.pg1.remote_hosts):
+ if isV6:
+ IP46 = IPv6
+ client_addr = self.pg0.remote_hosts[0].ip6
+ remote_addr = self.pg1.remote_hosts[nbr].ip6
+ src_nat_addr = self.pg2.remote_hosts[0].ip6
+ exclude_prefix = ip_network(
+ "%s/100" % remote_addr, strict=False)
+ else:
+ IP46 = IP
+ client_addr = self.pg0.remote_hosts[0].ip4
+ remote_addr = self.pg1.remote_hosts[nbr].ip4
+ src_nat_addr = self.pg2.remote_hosts[0].ip4
+ exclude_prefix = ip_network(
+ "%s/16" % remote_addr, strict=False)
+ # from pods to outside network
+ p1 = (
+ Ether(dst=self.pg0.local_mac,
+ src=self.pg0.remote_hosts[0].mac) /
+ IP46(src=client_addr, dst=remote_addr) /
+ l4p(sport=sports[nbr], dport=dports[nbr]) /
+ Raw())
+
+ self.vapi.cli("trace add pg-input 1")
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+ self.logger.info(self.vapi.cli("show trace max 1"))
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, remote_addr)
+ self.assertEqual(rx[l4p].dport, dports[nbr])
+ self.assertEqual(rx[IP46].src, src_nat_addr)
+ sport = rx[l4p].sport
+
+ # from outside to pods
+ p2 = (
+ Ether(dst=self.pg1.local_mac,
+ src=self.pg1.remote_hosts[nbr].mac) /
+ IP46(src=remote_addr, dst=src_nat_addr) /
+ l4p(sport=dports[nbr], dport=sport) /
+ Raw())
+
+ rxs = self.send_and_expect(
+ self.pg1,
+ p2 * N_PKTS,
+ self.pg0)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, client_addr)
+ self.assertEqual(rx[l4p].dport, sports[nbr])
+ self.assertEqual(rx[l4p].sport, dports[nbr])
+ self.assertEqual(rx[IP46].src, remote_addr)
+
+ # add remote host to exclude list
+ self.vapi.cnat_snat_policy_add_del_exclude_pfx(
+ prefix=exclude_prefix, is_add=1)
+ self.vapi.cnat_session_purge()
+
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, remote_addr)
+ self.assertEqual(rx[l4p].dport, dports[nbr])
+ self.assertEqual(rx[IP46].src, client_addr)
+
+ # remove remote host from exclude list
+ self.vapi.cnat_snat_policy_add_del_exclude_pfx(
+ prefix=exclude_prefix, is_add=0)
+ self.vapi.cnat_session_purge()
+
+ rxs = self.send_and_expect(
+ self.pg0,
+ p1 * N_PKTS,
+ self.pg1)
+
+ for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(rx[IP46].dst, remote_addr)
+ self.assertEqual(rx[l4p].dport, dports[nbr])
+ self.assertEqual(rx[IP46].src, src_nat_addr)
+
+ self.vapi.cnat_session_purge()
+
+
+class TestCNatDHCP(VppTestCase):
+ """ CNat Translation """
+ extra_vpp_punt_config = ["cnat", "{",
+ "session-db-buckets", "64",
+ "session-cleanup-timeout", "0.1",
+ "session-max-age", "1",
+ "tcp-max-age", "1",
+ "scanner", "off", "}"]
+
+ @classmethod
+ def setUpClass(cls):
+ super(TestCNatDHCP, cls).setUpClass()
+
+ @classmethod
+ def tearDownClass(cls):
+ super(TestCNatDHCP, cls).tearDownClass()
+
+ def tearDown(self):
+ for i in self.pg_interfaces:
+ i.admin_down()
+ super(TestCNatDHCP, self).tearDown()
+
+ def create_translation(self, vip_pg, *args, is_v6=False):
+ vip = Ep(sw_if_index=vip_pg.sw_if_index, is_v6=is_v6)
+ paths = []
+ for (src_pg, dst_pg) in args:
+ paths.append(EpTuple(
+ Ep.from_pg(src_pg, is_v6=is_v6),
+ Ep.from_pg(dst_pg, is_v6=is_v6)
+ ))
+ t1 = VppCNatTranslation(self, TCP, vip, paths)
+ t1.add_vpp_config()
+ return t1
+
+ def make_addr(self, sw_if_index, i, is_v6):
+ if is_v6:
+ return "fd01:%x::%u" % (sw_if_index, i + 1)
+ else:
+ return "172.16.%u.%u" % (sw_if_index, i)
+
+ def make_prefix(self, sw_if_index, i, is_v6):
+ if is_v6:
+ return "%s/128" % self.make_addr(sw_if_index, i, is_v6)
+ else:
+ return "%s/32" % self.make_addr(sw_if_index, i, is_v6)
+
+ def check_resolved(self, tr, vip_pg, *args, i=0, is_v6=False):
+ qt1 = tr.query_vpp_config()
+ self.assertEqual(str(qt1.vip.addr), self.make_addr(
+ vip_pg.sw_if_index, i, is_v6))
+ for (src_pg, dst_pg), path in zip(args, qt1.paths):
+ if src_pg:
+ self.assertEqual(str(path.src_ep.addr), self.make_addr(
+ src_pg.sw_if_index, i, is_v6))
+ if dst_pg:
+ self.assertEqual(str(path.dst_ep.addr), self.make_addr(
+ dst_pg.sw_if_index, i, is_v6))
+
+ def config_ips(self, rng, is_add=1, is_v6=False):
+ for pg, i in product(self.pg_interfaces, rng):
+ self.vapi.sw_interface_add_del_address(
+ sw_if_index=pg.sw_if_index,
+ prefix=self.make_prefix(pg.sw_if_index, i, is_v6),
+ is_add=is_add)
+
+ def test_dhcp_v4(self):
+ self.create_pg_interfaces(range(5))
+ for i in self.pg_interfaces:
+ i.admin_up()
+ pglist = (self.pg0, (self.pg1, self.pg2), (self.pg1, self.pg4))
+ t1 = self.create_translation(*pglist)
+ self.config_ips([0])
+ self.check_resolved(t1, *pglist)
+ self.config_ips([1])
+ self.config_ips([0], is_add=0)
+ self.check_resolved(t1, *pglist, i=1)
+ self.config_ips([1], is_add=0)
+ t1.remove_vpp_config()
+
+ def test_dhcp_v6(self):
+ self.create_pg_interfaces(range(5))
+ for i in self.pg_interfaces:
+ i.admin_up()
+ pglist = (self.pg0, (self.pg1, self.pg2), (self.pg1, self.pg4))
+ t1 = self.create_translation(*pglist, is_v6=True)
+ self.config_ips([0], is_v6=True)
+ self.check_resolved(t1, *pglist, is_v6=True)
+ self.config_ips([1], is_v6=True)
+ self.config_ips([0], is_add=0, is_v6=True)
+ self.check_resolved(t1, *pglist, i=1, is_v6=True)
+ self.config_ips([1], is_add=0, is_v6=True)
+ t1.remove_vpp_config()
+
+ def test_dhcp_snat(self):
+ self.create_pg_interfaces(range(1))
+ for i in self.pg_interfaces:
+ i.admin_up()
+ self.vapi.cnat_set_snat_addresses(sw_if_index=self.pg0.sw_if_index)
+ self.config_ips([0], is_v6=False)
+ self.config_ips([0], is_v6=True)
+ r = self.vapi.cnat_get_snat_addresses()
+ self.assertEqual(str(r.snat_ip4), self.make_addr(
+ self.pg0.sw_if_index, 0, False))
+ self.assertEqual(str(r.snat_ip6), self.make_addr(
+ self.pg0.sw_if_index, 0, True))
+ self.config_ips([1], is_v6=False)
+ self.config_ips([1], is_v6=True)
+ self.config_ips([0], is_add=0, is_v6=False)
+ self.config_ips([0], is_add=0, is_v6=True)
+ r = self.vapi.cnat_get_snat_addresses()
+ self.assertEqual(str(r.snat_ip4), self.make_addr(
+ self.pg0.sw_if_index, 1, False))
+ self.assertEqual(str(r.snat_ip6), self.make_addr(
+ self.pg0.sw_if_index, 1, True))
+ self.config_ips([1], is_add=0, is_v6=False)
+ self.config_ips([1], is_add=0, is_v6=True)
+ self.vapi.cnat_set_snat_addresses(sw_if_index=INVALID_INDEX)
+
+
+if __name__ == '__main__':
+ unittest.main(testRunner=VppTestRunner)