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vpp/test/test_cnat.py
Mohsin Kazmi f0a126a1eb cnat: add support for icmp traceroute 
Type: improvement

Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: Ief1e97d03b7a934547add35ac3ed1f93f2499a20
2024-12-09 09:21:42 +00:00

1071 lines
39 KiB
Python
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#!/usr/bin/env python3
import unittest
from framework import VppTestCase
from asfframework import VppTestRunner
from vpp_ip import INVALID_INDEX
from itertools import product
from config import config
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
from scapy.layers.inet6 import ICMPv6TimeExceeded
from ipaddress import ip_network
from vpp_object import VppObject
from vpp_papi import VppEnum
N_PKTS = 15
N_REMOTE_HOSTS = 3
SRC = 0
DST = 1
class CnatCommonTestCase(VppTestCase):
"""CNat common test class"""
#
# turn the scanner off whilst testing otherwise sessions
# will time out
#
extra_vpp_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(CnatCommonTestCase, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(CnatCommonTestCase, cls).tearDownClass()
class Endpoint(object):
"""CNat endpoint"""
def __init__(self, pg=None, pgi=None, port=0, is_v6=False, ip=None):
self.port = port
self.is_v6 = is_v6
self.sw_if_index = INVALID_INDEX
if pg is not None and pgi is not None:
# pg interface specified and remote index
self.ip = self.get_ip46(pg.remote_hosts[pgi])
elif pg is not None:
self.ip = None
self.sw_if_index = pg.sw_if_index
elif ip is not None:
self.ip = ip
else:
self.ip = "::" if self.is_v6 else "0.0.0.0"
def get_ip46(self, obj):
if self.is_v6:
return obj.ip6
return obj.ip4
def udpate(self, **kwargs):
self.__init__(**kwargs)
def _vpp_if_af(self):
if self.is_v6:
return VppEnum.vl_api_address_family_t.ADDRESS_IP6
return 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._vpp_if_af(),
}
def __str__(self):
return "%s:%d" % (self.ip, self.port)
class Translation(VppObject):
def __init__(self, test, iproto, vip, paths, fhc):
self._test = test
self.vip = vip
self.iproto = iproto
self.paths = paths
self.fhc = fhc
self.id = None
def __str__(self):
return "%s %s %s" % (self.vip, self.iproto, self.paths)
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 _encoded_paths(self):
return [
{"src_ep": src.encode(), "dst_ep": dst.encode()}
for (src, dst) in self.paths
]
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(),
"flow_hash_config": self.fhc,
}
)
self._test.registry.register(self, self._test.logger)
self.id = r.id
return self
def remove_vpp_config(self):
assert self.id is not None
self._test.vapi.cnat_translation_del(id=self.id)
return self
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
class CnatTestContext(object):
"""
Usage :
ctx = CnatTestContext(self, TCP, is_v6=True)
# send pg0.remote[0]:1234 -> pg1.remote[0]:6661
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 0, 6661)
# We expect this to be NATed as
# pg2.remote[0]:<anyport> -> pg1.remote[0]:6661
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 0, 6661)
# After running cnat_expect, we can send back the received packet
# and expect it be 'unnated' so that we get the original packet
ctx.cnat_send_return().cnat_expect_return()
# same thing for ICMP errors
ctx.cnat_send_icmp_return_error().cnat_expect_icmp_error_return()
"""
def __init__(self, test, L4PROTO, is_v6):
self.L4PROTO = L4PROTO
self.is_v6 = is_v6
self._test = test
def get_ip46(self, obj):
if self.is_v6:
return obj.ip6
return obj.ip4
@property
def IP46(self):
return IPv6 if self.is_v6 else IP
def cnat_send(
self, src_pg, src_id, src_port, dst_pg, dst_id, dst_port, no_replies=False
):
if isinstance(src_id, int):
self.src_addr = self.get_ip46(src_pg.remote_hosts[src_id])
else:
self.dst_addr = src_id
if isinstance(dst_id, int):
self.dst_addr = self.get_ip46(dst_pg.remote_hosts[dst_id])
else:
self.dst_addr = dst_id
self.src_port = src_port # also ICMP id
self.dst_port = dst_port # also ICMP type
if self.L4PROTO in [TCP, UDP]:
l4 = self.L4PROTO(sport=self.src_port, dport=self.dst_port)
elif self.L4PROTO in [ICMP] and not self.is_v6:
l4 = self.L4PROTO(id=self.src_port, type=self.dst_port)
elif self.L4PROTO in [ICMP] and self.is_v6:
l4 = ICMPv6EchoRequest(id=self.src_port)
p1 = (
Ether(src=src_pg.remote_mac, dst=src_pg.local_mac)
/ self.IP46(src=self.src_addr, dst=self.dst_addr)
/ l4
/ Raw()
)
if no_replies:
self._test.send_and_assert_no_replies(src_pg, p1 * N_PKTS, dst_pg)
else:
self.rxs = self._test.send_and_expect(src_pg, p1 * N_PKTS, dst_pg)
self.expected_src_pg = src_pg
self.expected_dst_pg = dst_pg
return self
def cnat_expect(self, src_pg, src_id, src_port, dst_pg, dst_id, dst_port):
if isinstance(src_id, int):
self.expect_src_addr = self.get_ip46(src_pg.remote_hosts[src_id])
else:
self.expect_src_addr = src_id
if isinstance(dst_id, int):
self.expect_dst_addr = self.get_ip46(dst_pg.remote_hosts[dst_id])
else:
self.expect_dst_addr = dst_id
self.expect_src_port = src_port
self.expect_dst_port = dst_port
if self.expect_src_port is None:
if self.L4PROTO in [TCP, UDP]:
self.expect_src_port = self.rxs[0][self.L4PROTO].sport
elif self.L4PROTO in [ICMP] and not self.is_v6:
self.expect_src_port = self.rxs[0][self.L4PROTO].id
elif self.L4PROTO in [ICMP] and self.is_v6:
self.expect_src_port = self.rxs[0][ICMPv6EchoRequest].id
for rx in self.rxs:
self._test.assert_packet_checksums_valid(rx)
self._test.assertEqual(rx[self.IP46].dst, self.expect_dst_addr)
self._test.assertEqual(rx[self.IP46].src, self.expect_src_addr)
if self.L4PROTO in [TCP, UDP]:
self._test.assertEqual(rx[self.L4PROTO].dport, self.expect_dst_port)
self._test.assertEqual(rx[self.L4PROTO].sport, self.expect_src_port)
elif self.L4PROTO in [ICMP] and not self.is_v6:
self._test.assertEqual(rx[self.L4PROTO].type, self.expect_dst_port)
self._test.assertEqual(rx[self.L4PROTO].id, self.expect_src_port)
elif self.L4PROTO in [ICMP] and self.is_v6:
self._test.assertEqual(rx[ICMPv6EchoRequest].id, self.expect_src_port)
return self
def cnat_send_return(self):
"""This sends the return traffic"""
if self.L4PROTO in [TCP, UDP]:
l4 = self.L4PROTO(sport=self.expect_dst_port, dport=self.expect_src_port)
elif self.L4PROTO in [ICMP] and not self.is_v6:
# icmp type 0 if echo reply
l4 = self.L4PROTO(id=self.expect_src_port, type=0)
elif self.L4PROTO in [ICMP] and self.is_v6:
l4 = ICMPv6EchoReply(id=self.expect_src_port)
src_mac = self.expected_dst_pg.remote_mac
p1 = (
Ether(src=src_mac, dst=self.expected_dst_pg.local_mac)
/ self.IP46(src=self.expect_dst_addr, dst=self.expect_src_addr)
/ l4
/ Raw()
)
self.return_rxs = self._test.send_and_expect(
self.expected_dst_pg, p1 * N_PKTS, self.expected_src_pg
)
return self
def cnat_expect_return(self):
for rx in self.return_rxs:
self._test.assert_packet_checksums_valid(rx)
self._test.assertEqual(rx[self.IP46].dst, self.src_addr)
self._test.assertEqual(rx[self.IP46].src, self.dst_addr)
if self.L4PROTO in [TCP, UDP]:
self._test.assertEqual(rx[self.L4PROTO].dport, self.src_port)
self._test.assertEqual(rx[self.L4PROTO].sport, self.dst_port)
elif self.L4PROTO in [ICMP] and not self.is_v6:
# icmp type 0 if echo reply
self._test.assertEqual(rx[self.L4PROTO].type, 0)
self._test.assertEqual(rx[self.L4PROTO].id, self.src_port)
elif self.L4PROTO in [ICMP] and self.is_v6:
self._test.assertEqual(rx[ICMPv6EchoReply].id, self.src_port)
return self
def cnat_send_icmp_return_error(self):
"""
This called after cnat_expect will send an icmp error
on the reverse path
"""
ICMPelem = ICMPv6DestUnreach(code=1) if self.is_v6 else ICMP(type=11)
InnerIP = self.rxs[0][self.IP46]
p1 = (
Ether(
src=self.expected_dst_pg.remote_mac, dst=self.expected_dst_pg.local_mac
)
/ self.IP46(src=self.expect_dst_addr, dst=self.expect_src_addr)
/ ICMPelem
/ InnerIP
)
self.return_rxs = self._test.send_and_expect(
self.expected_dst_pg, p1 * N_PKTS, self.expected_src_pg
)
return self
def cnat_expect_icmp_error_return(self):
ICMP46 = ICMPv6DestUnreach if self.is_v6 else ICMP
IP46err = IPerror6 if self.is_v6 else IPerror
L4err = TCPerror if self.L4PROTO is TCP else UDPerror
for rx in self.return_rxs:
self._test.assert_packet_checksums_valid(rx)
self._test.assertEqual(rx[self.IP46].dst, self.src_addr)
self._test.assertEqual(rx[self.IP46].src, self.dst_addr)
self._test.assertEqual(rx[ICMP46][IP46err].src, self.src_addr)
self._test.assertEqual(rx[ICMP46][IP46err].dst, self.dst_addr)
self._test.assertEqual(rx[ICMP46][IP46err][L4err].sport, self.src_port)
self._test.assertEqual(rx[ICMP46][IP46err][L4err].dport, self.dst_port)
return self
# -------------------------------------------------------------------
# -------------------------------------------------------------------
# -------------------------------------------------------------------
# -------------------------------------------------------------------
@unittest.skipIf("cnat" in config.excluded_plugins, "Exclude CNAT plugin tests")
class TestCNatTranslation(CnatCommonTestCase):
"""CNat Translation"""
@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))
self.pg0.generate_remote_hosts(N_REMOTE_HOSTS)
self.pg1.generate_remote_hosts(N_REMOTE_HOSTS)
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
i.configure_ipv4_neighbors()
i.configure_ipv6_neighbors()
def tearDown(self):
for translation in self.translations:
translation.remove_vpp_config()
self.vapi.cnat_session_purge()
self.assertFalse(self.vapi.cnat_session_dump())
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
super(TestCNatTranslation, self).tearDown()
def cnat_fhc_translation(self):
"""CNat Translation"""
self.logger.info(self.vapi.cli("sh cnat client"))
self.logger.info(self.vapi.cli("sh cnat translation"))
for nbr, translation in enumerate(self.mbtranslations):
vip = translation.vip
#
# Flows to the VIP with same ips and different source ports are loadbalanced identically
# in both cases of flow hash 0x03 (src ip and dst ip) and 0x08 (dst port)
#
ctx = CnatTestContext(self, translation.iproto, vip.is_v6)
for src_pgi, sport in product(range(N_REMOTE_HOSTS), [1234, 1233]):
# from client to vip
ctx.cnat_send(self.pg0, src_pgi, sport, self.pg1, vip.ip, vip.port)
dport1 = ctx.rxs[0][ctx.L4PROTO].dport
ctx._test.assertIn(
dport1,
[translation.paths[0][DST].port, translation.paths[1][DST].port],
)
ctx.cnat_expect(self.pg0, src_pgi, sport, self.pg1, nbr, dport1)
ctx.cnat_send(
self.pg0, src_pgi, sport + 122, self.pg1, vip.ip, vip.port
)
dport2 = ctx.rxs[0][ctx.L4PROTO].dport
ctx._test.assertIn(
dport2,
[translation.paths[0][DST].port, translation.paths[1][DST].port],
)
ctx.cnat_expect(self.pg0, src_pgi, sport + 122, self.pg1, nbr, dport2)
ctx._test.assertEqual(dport1, dport2)
def cnat_translation(self):
"""CNat Translation"""
self.logger.info(self.vapi.cli("sh cnat client"))
self.logger.info(self.vapi.cli("sh cnat translation"))
for nbr, translation in enumerate(self.translations):
vip = translation.vip
#
# Test Flows to the VIP
#
ctx = CnatTestContext(self, translation.iproto, vip.is_v6)
for src_pgi, sport in product(range(N_REMOTE_HOSTS), [1234, 1233]):
# from client to vip
ctx.cnat_send(self.pg0, src_pgi, sport, self.pg1, vip.ip, vip.port)
dst_port = translation.paths[0][DST].port
ctx.cnat_expect(self.pg0, src_pgi, sport, self.pg1, nbr, dst_port)
# from vip to client
ctx.cnat_send_return().cnat_expect_return()
#
# packets to the VIP that do not match a
# translation are dropped
#
ctx.cnat_send(
self.pg0, src_pgi, sport, self.pg1, vip.ip, 6666, no_replies=True
)
#
# packets from the VIP that do not match a
# session are forwarded
#
ctx.cnat_send(self.pg1, nbr, 6666, self.pg0, src_pgi, sport)
ctx.cnat_expect(self.pg1, nbr, 6666, self.pg0, src_pgi, sport)
#
# modify the translation to use a different backend
#
old_dst_port = translation.paths[0][DST].port
translation.paths[0][DST].udpate(
pg=self.pg2, pgi=0, port=5000, is_v6=vip.is_v6
)
translation.add_vpp_config()
#
# existing flows follow the old path
#
for src_pgi in range(N_REMOTE_HOSTS):
for sport in [1234, 1233]:
# from client to vip
ctx.cnat_send(self.pg0, src_pgi, sport, self.pg1, vip.ip, vip.port)
ctx.cnat_expect(
self.pg0, src_pgi, sport, self.pg1, nbr, old_dst_port
)
# from vip to client
ctx.cnat_send_return().cnat_expect_return()
#
# new flows go to the new backend
#
for src_pgi in range(N_REMOTE_HOSTS):
ctx.cnat_send(self.pg0, src_pgi, 9999, self.pg2, vip.ip, vip.port)
ctx.cnat_expect(self.pg0, src_pgi, 9999, self.pg2, 0, 5000)
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")
self.virtual_sleep(2)
sessions = self.vapi.cnat_session_dump()
self.assertEqual(len(sessions), 0)
self.vapi.cli("test cnat scanner off")
#
# load some flows again and purge
#
for translation in self.translations:
vip = translation.vip
ctx = CnatTestContext(self, translation.iproto, vip.is_v6)
for src_pgi in range(N_REMOTE_HOSTS):
for sport in [1234, 1233]:
# from client to vip
ctx.cnat_send(self.pg0, src_pgi, sport, self.pg2, vip.ip, vip.port)
ctx.cnat_expect(self.pg0, src_pgi, sport, self.pg2, 0, 5000)
def _test_icmp(self):
#
# Testing ICMP
#
for nbr, translation in enumerate(self.translations):
vip = translation.vip
ctx = CnatTestContext(self, translation.iproto, vip.is_v6)
#
# NATing ICMP errors
#
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, vip.ip, vip.port)
dst_port = translation.paths[0][DST].port
ctx.cnat_expect(self.pg0, 0, 1234, self.pg1, nbr, dst_port)
ctx.cnat_send_icmp_return_error().cnat_expect_icmp_error_return()
#
# ICMP errors with no VIP associated should not be
# modified
#
ctx.cnat_send(self.pg0, 0, 1234, self.pg2, 0, vip.port)
dst_port = translation.paths[0][DST].port
ctx.cnat_expect(self.pg0, 0, 1234, self.pg2, 0, vip.port)
ctx.cnat_send_icmp_return_error().cnat_expect_icmp_error_return()
def _make_multi_backend_translations(self):
self.translations = []
self.mbtranslations = []
self.mbtranslations.append(
Translation(
self,
TCP,
Endpoint(ip="30.0.0.5", port=5555, is_v6=False),
[
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=0, port=4001, is_v6=False),
),
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=0, port=4005, is_v6=False),
),
],
0x03, # hash only on dst ip and src ip
).add_vpp_config()
)
self.mbtranslations.append(
Translation(
self,
TCP,
Endpoint(ip="30.0.0.6", port=5555, is_v6=False),
[
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=1, port=4006, is_v6=False),
),
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=1, port=4007, is_v6=False),
),
],
0x08, # hash only on dst port
).add_vpp_config()
)
def _make_translations_v4(self):
self.translations = []
self.translations.append(
Translation(
self,
TCP,
Endpoint(ip="30.0.0.1", port=5555, is_v6=False),
[
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=0, port=4001, is_v6=False),
)
],
0x9F,
).add_vpp_config()
)
self.translations.append(
Translation(
self,
TCP,
Endpoint(ip="30.0.0.2", port=5554, is_v6=False),
[
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=1, port=4002, is_v6=False),
)
],
0x9F,
).add_vpp_config()
)
self.translations.append(
Translation(
self,
UDP,
Endpoint(ip="30.0.0.2", port=5553, is_v6=False),
[
(
Endpoint(is_v6=False),
Endpoint(pg=self.pg1, pgi=2, port=4003, is_v6=False),
)
],
0x9F,
).add_vpp_config()
)
def _make_translations_v6(self):
self.translations = []
self.translations.append(
Translation(
self,
TCP,
Endpoint(ip="30::1", port=5555, is_v6=True),
[
(
Endpoint(is_v6=True),
Endpoint(pg=self.pg1, pgi=0, port=4001, is_v6=True),
)
],
0x9F,
).add_vpp_config()
)
self.translations.append(
Translation(
self,
TCP,
Endpoint(ip="30::2", port=5554, is_v6=True),
[
(
Endpoint(is_v6=True),
Endpoint(pg=self.pg1, pgi=1, port=4002, is_v6=True),
)
],
0x9F,
).add_vpp_config()
)
self.translations.append(
Translation(
self,
UDP,
Endpoint(ip="30::2", port=5553, is_v6=True),
[
(
Endpoint(is_v6=True),
Endpoint(pg=self.pg1, pgi=2, port=4003, is_v6=True),
)
],
0x9F,
).add_vpp_config()
)
def test_icmp4(self):
# """ CNat Translation icmp v4 """
self._make_translations_v4()
self._test_icmp()
def test_icmp6(self):
# """ CNat Translation icmp v6 """
self._make_translations_v6()
self._test_icmp()
def test_cnat6(self):
# """ CNat Translation ipv6 """
self._make_translations_v6()
self.cnat_translation()
def test_cnat4(self):
# """ CNat Translation ipv4 """
self._make_translations_v4()
self.cnat_translation()
def test_cnat_fhc(self):
# """ CNat Translation flow hash config """
self._make_multi_backend_translations()
self.cnat_fhc_translation()
@unittest.skipIf("cnat" in config.excluded_plugins, "Exclude CNAT plugin tests")
class TestCNatSourceNAT(CnatCommonTestCase):
"""CNat Source NAT"""
@classmethod
def setUpClass(cls):
super(TestCNatSourceNAT, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestCNatSourceNAT, cls).tearDownClass()
def _enable_disable_snat(self, is_enable=True):
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 if is_enable else 0,
arc_name="ip6-unicast",
feature_name="cnat-snat-ip6",
sw_if_index=self.pg0.sw_if_index,
)
self.vapi.feature_enable_disable(
enable=1 if is_enable else 0,
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 if is_enable else 0,
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 if is_enable else 0,
table=policie_tbls.CNAT_POLICY_INCLUDE_V4,
)
def setUp(self):
super(TestCNatSourceNAT, self).setUp()
self.create_pg_interfaces(range(3))
self.pg1.generate_remote_hosts(2)
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
i.configure_ipv6_neighbors()
i.configure_ipv4_neighbors()
self._enable_disable_snat(is_enable=True)
def tearDown(self):
self._enable_disable_snat(is_enable=True)
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, is_v6=True)
self.sourcenat_test_tcp_udp_conf(UDP, is_v6=True)
self.sourcenat_test_icmp_echo_conf(is_v6=True)
self.sourcenat_test_icmp_traceroute_conf(is_v6=True)
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_echo_conf()
self.sourcenat_test_icmp_traceroute_conf()
def sourcenat_test_icmp_echo_conf(self, is_v6=False):
ctx = CnatTestContext(self, ICMP, is_v6=is_v6)
# 8 is ICMP type echo (v4 only)
ctx.cnat_send(self.pg0, 0, 0xFEED, self.pg1, 0, 8)
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 0, 8)
ctx.cnat_send_return().cnat_expect_return()
def sourcenat_test_icmp_traceroute_conf(self, is_v6=False):
# IPv4 ICMP
if not is_v6:
# Create an ICMP traceroute packet with TTL set to 1.
# The CNAT translates the packet, but the NATted packet is dropped
# due to the TTL of 1. An ICMP Time Exceeded message is sent
# to the source (which is the NATted address).
# The packet will be translated once more to the original
# source IP address.
icmp = (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(
ttl=1,
src=self.pg0.remote_hosts[0].ip4,
dst=self.pg1.remote_hosts[0].ip4,
)
/ ICMP(id=0xFEED, type=8) # ICMP Type Echo Request
/ Raw()
)
self.rxs = self.send_and_expect(self.pg0, icmp, self.pg0)
for rx in self.rxs:
self.assert_packet_checksums_valid(rx)
self.assertEqual(rx[IP].dst, self.pg0.remote_hosts[0].ip4)
self.assertEqual(rx[IP].src, "172.16.1.1")
self.assertEqual(rx[ICMP].type, 11) # ICMP Type 11 (Time Exceeded)
self.assertEqual(
rx[ICMP].code, 0
) # ICMP Code 0 (TTL Zero During Transit)
inner = rx[ICMP].payload
self.assertEqual(inner[IPerror].src, self.pg0.remote_hosts[0].ip4)
self.assertEqual(inner[IPerror].dst, self.pg1.remote_hosts[0].ip4)
self.assertEqual(inner[ICMPerror].type, 8) # ICMP Echo Request
self.assertEqual(inner[ICMPerror].id, 0xFEED)
# source ---> NATted Transit ---> Transit 2 ... ---> Transit N ---> Destination
# Simulate an ICMP Time Exceeded message arriving at the NATted Transit
# from the Transit N-2 node. This occurs because the NATted packet
# is dropped due to a TTL of 1.
# An ICMP Time Exceeded message is sent back to the source
# (initially the NATted address). The CNAT then translates the message
# back to the original source IP address.
# For ICMP based traffic, snat session uses identifier for session key.
# snat allocates a new identifier. To hit the snat session from Transit N-2
# to NATed Transit, packet should use snat allocated identifier. To get the
# snat allocated identifier, echo request will be sent and captured at the
# destination, taken out the identifier from the packet and use it to set
# the identifier in the ICMP time exceed packet
icmp[IP].ttl = 64
rxs = self.send_and_expect(self.pg0, icmp, self.pg1)
icmp_error = (
Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
/ IP(src="172.16.1.1", dst=self.pg2.remote_hosts[0].ip4)
/ ICMP(type=11, code=0)
/ IPerror(
src=self.pg2.remote_hosts[0].ip4, dst=self.pg1.remote_hosts[0].ip4
)
/ ICMPerror(id=rxs[0][ICMP].id, type=8)
/ Raw()
)
self.rxs = self.send_and_expect(self.pg1, icmp_error, self.pg0)
for rx in self.rxs:
self.assert_packet_checksums_valid(rx)
self.assertEqual(rx[IP].dst, self.pg0.remote_hosts[0].ip4)
self.assertEqual(rx[IP].src, "172.16.1.1")
self.assertEqual(rx[ICMP].type, 11) # ICMP Type 11 (Time Exceeded)
self.assertEqual(
rx[ICMP].code, 0
) # ICMP Code 0 (TTL Zero During Transit)
inner = rx[ICMP].payload
self.assertEqual(inner[IPerror].src, self.pg0.remote_hosts[0].ip4)
self.assertEqual(inner[IPerror].dst, self.pg1.remote_hosts[0].ip4)
self.assertEqual(inner[ICMPerror].type, 8) # ICMP Echo Request
self.assertEqual(inner[ICMPerror].id, 0xFEED)
# IPv6 ICMPv6
if is_v6:
# Create an ICMPv6 traceroute packet with Hop Limit set to 1.
# The CNAT translates the packet, but the NATted packet is dropped
# due to the Hop Limit of 1. An ICMPv6 Time Exceeded message is sent
# back to the source (which is the NATted address).
# The CNAT translates the message once more to restore
# the original source IPv6 address.
icmp6 = (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IPv6(
hlim=1,
src=self.pg0.remote_hosts[0].ip6,
dst=self.pg1.remote_hosts[0].ip6,
)
/ ICMPv6EchoRequest(id=0xFEED)
/ Raw()
)
self.rxs = self.send_and_expect(self.pg0, icmp6, self.pg0)
for rx in self.rxs:
self.assert_packet_checksums_valid(rx)
self.assertEqual(rx[IPv6].dst, self.pg0.remote_hosts[0].ip6)
self.assertEqual(rx[IPv6].src, "fd01:1::1")
self.assertEqual(
rx[ICMPv6TimeExceeded].type, 3
) # ICMPv6 Type 3 (Time Exceeded)
self.assertEqual(
rx[ICMPv6TimeExceeded].code, 0
) # ICMPv6 Code 0 (TTL Zero During Transit)
inner = rx[ICMPv6TimeExceeded].payload
self.assertEqual(inner[IPerror6].src, self.pg0.remote_hosts[0].ip6)
self.assertEqual(inner[IPerror6].dst, self.pg1.remote_hosts[0].ip6)
self.assertEqual(
inner[ICMPv6EchoRequest].type, 128
) # ICMPv6 Echo Request
self.assertEqual(inner[ICMPv6EchoRequest].id, 0xFEED)
def sourcenat_test_tcp_udp_conf(self, L4PROTO, is_v6=False):
ctx = CnatTestContext(self, L4PROTO, is_v6)
# we should source NAT
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 0, 6661)
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 0, 6661)
ctx.cnat_send_return().cnat_expect_return()
# exclude dst address of pg1.1 from snat
if is_v6:
exclude_prefix = ip_network(
"%s/100" % self.pg1.remote_hosts[1].ip6, strict=False
)
else:
exclude_prefix = ip_network(
"%s/16" % self.pg1.remote_hosts[1].ip4, strict=False
)
# add remote host to exclude list
self.vapi.cnat_snat_policy_add_del_exclude_pfx(prefix=exclude_prefix, is_add=1)
# We should not source NAT the id=1
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 1, 6661)
ctx.cnat_expect(self.pg0, 0, 1234, self.pg1, 1, 6661)
ctx.cnat_send_return().cnat_expect_return()
# But we should source NAT the id=0
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 0, 6661)
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 0, 6661)
ctx.cnat_send_return().cnat_expect_return()
# 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()
# We should source NAT again
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 1, 6661)
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 1, 6661)
ctx.cnat_send_return().cnat_expect_return()
# test return ICMP error nating
ctx.cnat_send(self.pg0, 0, 1234, self.pg1, 1, 6661)
ctx.cnat_expect(self.pg2, 0, None, self.pg1, 1, 6661)
ctx.cnat_send_icmp_return_error().cnat_expect_icmp_error_return()
self.vapi.cnat_session_purge()
@unittest.skipIf("cnat" in config.excluded_plugins, "Exclude CNAT plugin tests")
class TestCNatDHCP(CnatCommonTestCase):
"""CNat DHCP"""
@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 make_addr(self, sw_if_index, addr_id, is_v6):
if is_v6:
return "fd01:%x::%u" % (sw_if_index, addr_id + 1)
return "172.16.%u.%u" % (sw_if_index, addr_id)
def make_prefix(self, sw_if_index, addr_id, is_v6):
if is_v6:
return "%s/128" % self.make_addr(sw_if_index, addr_id, is_v6)
return "%s/32" % self.make_addr(sw_if_index, addr_id, is_v6)
def check_resolved(self, tr, addr_id, is_v6=False):
qt = tr.query_vpp_config()
self.assertEqual(
str(qt.vip.addr), self.make_addr(tr.vip.sw_if_index, addr_id, is_v6)
)
self.assertEqual(len(qt.paths), len(tr.paths))
for path_tr, path_qt in zip(tr.paths, qt.paths):
src_qt = path_qt.src_ep
dst_qt = path_qt.dst_ep
src_tr, dst_tr = path_tr
self.assertEqual(
str(src_qt.addr), self.make_addr(src_tr.sw_if_index, addr_id, is_v6)
)
self.assertEqual(
str(dst_qt.addr), self.make_addr(dst_tr.sw_if_index, addr_id, is_v6)
)
def add_del_address(self, pg, addr_id, is_add=True, is_v6=False):
self.vapi.sw_interface_add_del_address(
sw_if_index=pg.sw_if_index,
prefix=self.make_prefix(pg.sw_if_index, addr_id, is_v6),
is_add=1 if is_add else 0,
)
def _test_dhcp_v46(self, is_v6):
self.create_pg_interfaces(range(4))
for i in self.pg_interfaces:
i.admin_up()
paths = [
(Endpoint(pg=self.pg1, is_v6=is_v6), Endpoint(pg=self.pg2, is_v6=is_v6)),
(Endpoint(pg=self.pg1, is_v6=is_v6), Endpoint(pg=self.pg3, is_v6=is_v6)),
]
ep = Endpoint(pg=self.pg0, is_v6=is_v6)
t = Translation(self, TCP, ep, paths, 0x9F).add_vpp_config()
# Add an address on every interface
# and check it is reflected in the cnat config
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=0, is_add=True, is_v6=is_v6)
self.check_resolved(t, addr_id=0, is_v6=is_v6)
# Add a new address on every interface, remove the old one
# and check it is reflected in the cnat config
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=1, is_add=True, is_v6=is_v6)
self.add_del_address(pg, addr_id=0, is_add=False, is_v6=is_v6)
self.check_resolved(t, addr_id=1, is_v6=is_v6)
# remove the configuration
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=1, is_add=False, is_v6=is_v6)
t.remove_vpp_config()
def test_dhcp_v4(self):
self._test_dhcp_v46(False)
def test_dhcp_v6(self):
self._test_dhcp_v46(True)
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)
# Add an address on every interface
# and check it is reflected in the cnat config
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=0, is_add=True, is_v6=False)
self.add_del_address(pg, addr_id=0, is_add=True, is_v6=True)
r = self.vapi.cnat_get_snat_addresses()
self.assertEqual(
str(r.snat_ip4),
self.make_addr(self.pg0.sw_if_index, addr_id=0, is_v6=False),
)
self.assertEqual(
str(r.snat_ip6), self.make_addr(self.pg0.sw_if_index, addr_id=0, is_v6=True)
)
# Add a new address on every interface, remove the old one
# and check it is reflected in the cnat config
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=1, is_add=True, is_v6=False)
self.add_del_address(pg, addr_id=1, is_add=True, is_v6=True)
self.add_del_address(pg, addr_id=0, is_add=False, is_v6=False)
self.add_del_address(pg, addr_id=0, is_add=False, is_v6=True)
r = self.vapi.cnat_get_snat_addresses()
self.assertEqual(
str(r.snat_ip4),
self.make_addr(self.pg0.sw_if_index, addr_id=1, is_v6=False),
)
self.assertEqual(
str(r.snat_ip6), self.make_addr(self.pg0.sw_if_index, addr_id=1, is_v6=True)
)
# remove the configuration
for pg in self.pg_interfaces:
self.add_del_address(pg, addr_id=1, is_add=False, is_v6=False)
self.add_del_address(pg, addr_id=1, is_add=False, is_v6=True)
self.vapi.cnat_set_snat_addresses(sw_if_index=INVALID_INDEX)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
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