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#!/usr/bin/env python3
#
# Copyright (C) 2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import jmespath
import json
import unittest
from base_vyostest_shim import VyOSUnitTestSHIM
from vyos.configsession import ConfigSessionError
from vyos.util import cmd
from vyos.util import dict_search
base_path = ['nat66']
src_path = base_path + ['source']
dst_path = base_path + ['destination']
class TestNAT66(VyOSUnitTestSHIM.TestCase):
@classmethod
def setUpClass(cls):
super(TestNAT66, cls).setUpClass()
# ensure we can also run this test on a live system - so lets clean
# out the current configuration :)
cls.cli_delete(cls, base_path)
def tearDown(self):
self.cli_delete(base_path)
self.cli_commit()
def verify_nftables(self, nftables_search, table, inverse=False, args=''):
nftables_output = cmd(f'sudo nft {args} list table {table}')
for search in nftables_search:
matched = False
for line in nftables_output.split("\n"):
if all(item in line for item in search):
matched = True
break
self.assertTrue(not matched if inverse else matched, msg=search)
def test_source_nat66(self):
source_prefix = 'fc00::/64'
translation_prefix = 'fc01::/64'
self.cli_set(src_path + ['rule', '1', 'outbound-interface', 'eth1'])
self.cli_set(src_path + ['rule', '1', 'source', 'prefix', source_prefix])
self.cli_set(src_path + ['rule', '1', 'translation', 'address', translation_prefix])
self.cli_set(src_path + ['rule', '2', 'outbound-interface', 'eth1'])
self.cli_set(src_path + ['rule', '2', 'source', 'prefix', source_prefix])
self.cli_set(src_path + ['rule', '2', 'translation', 'address', 'masquerade'])
self.cli_set(src_path + ['rule', '3', 'outbound-interface', 'eth1'])
self.cli_set(src_path + ['rule', '3', 'source', 'prefix', source_prefix])
self.cli_set(src_path + ['rule', '3', 'exclude'])
self.cli_commit()
nftables_search = [
['oifname "eth1"', 'ip6 saddr fc00::/64', 'snat prefix to fc01::/64'],
['oifname "eth1"', 'ip6 saddr fc00::/64', 'masquerade'],
['oifname "eth1"', 'ip6 saddr fc00::/64', 'return']
]
self.verify_nftables(nftables_search, 'ip6 nat')
def test_source_nat66_address(self):
source_prefix = 'fc00::/64'
translation_address = 'fc00::1'
self.cli_set(src_path + ['rule', '1', 'outbound-interface', 'eth1'])
self.cli_set(src_path + ['rule', '1', 'source', 'prefix', source_prefix])
self.cli_set(src_path + ['rule', '1', 'translation', 'address', translation_address])
# check validate() - outbound-interface must be defined
self.cli_commit()
tmp = cmd('sudo nft -j list table ip6 nat')
data_json = jmespath.search('nftables[?rule].rule[?chain]', json.loads(tmp))
for idx in range(0, len(data_json)):
data = data_json[idx]
self.assertEqual(data['chain'], 'POSTROUTING')
self.assertEqual(data['family'], 'ip6')
self.assertEqual(data['table'], 'nat')
iface = dict_search('match.right', data['expr'][0])
address = dict_search('match.right.prefix.addr', data['expr'][2])
mask = dict_search('match.right.prefix.len', data['expr'][2])
snat_address = dict_search('snat.addr', data['expr'][3])
self.assertEqual(iface, 'eth1')
# check for translation address
self.assertEqual(snat_address, translation_address)
self.assertEqual(f'{address}/{mask}', source_prefix)
def test_destination_nat66(self):
destination_address = 'fc00::1'
translation_address = 'fc01::1'
source_address = 'fc02::1'
self.cli_set(dst_path + ['rule', '1', 'inbound-interface', 'eth1'])
self.cli_set(dst_path + ['rule', '1', 'destination', 'address', destination_address])
self.cli_set(dst_path + ['rule', '1', 'translation', 'address', translation_address])
self.cli_set(dst_path + ['rule', '2', 'inbound-interface', 'eth1'])
self.cli_set(dst_path + ['rule', '2', 'destination', 'address', destination_address])
self.cli_set(dst_path + ['rule', '2', 'source', 'address', source_address])
self.cli_set(dst_path + ['rule', '2', 'exclude'])
# check validate() - outbound-interface must be defined
self.cli_commit()
nftables_search = [
['iifname "eth1"', 'ip6 daddr fc00::1', 'dnat to fc01::1'],
['iifname "eth1"', 'ip6 saddr fc02::1', 'ip6 daddr fc00::1', 'return']
]
self.verify_nftables(nftables_search, 'ip6 nat')
def test_destination_nat66_protocol(self):
translation_address = '2001:db8:1111::1'
source_prefix = '2001:db8:2222::/64'
dport = '4545'
sport = '8080'
tport = '5555'
proto = 'tcp'
self.cli_set(dst_path + ['rule', '1', 'inbound-interface', 'eth1'])
self.cli_set(dst_path + ['rule', '1', 'destination', 'port', dport])
self.cli_set(dst_path + ['rule', '1', 'source', 'address', source_prefix])
self.cli_set(dst_path + ['rule', '1', 'source', 'port', sport])
self.cli_set(dst_path + ['rule', '1', 'protocol', proto])
self.cli_set(dst_path + ['rule', '1', 'translation', 'address', translation_address])
self.cli_set(dst_path + ['rule', '1', 'translation', 'port', tport])
# check validate() - outbound-interface must be defined
self.cli_commit()
nftables_search = [
['iifname "eth1"', 'tcp dport { 4545 } ip6 saddr 2001:db8:2222::/64 tcp sport { 8080 } dnat to 2001:db8:1111::1:5555']
]
self.verify_nftables(nftables_search, 'ip6 nat')
def test_destination_nat66_prefix(self):
destination_prefix = 'fc00::/64'
translation_prefix = 'fc01::/64'
self.cli_set(dst_path + ['rule', '1', 'inbound-interface', 'eth1'])
self.cli_set(dst_path + ['rule', '1', 'destination', 'address', destination_prefix])
self.cli_set(dst_path + ['rule', '1', 'translation', 'address', translation_prefix])
# check validate() - outbound-interface must be defined
self.cli_commit()
tmp = cmd('sudo nft -j list table ip6 nat')
data_json = jmespath.search('nftables[?rule].rule[?chain]', json.loads(tmp))
for idx in range(0, len(data_json)):
data = data_json[idx]
self.assertEqual(data['chain'], 'PREROUTING')
self.assertEqual(data['family'], 'ip6')
self.assertEqual(data['table'], 'nat')
iface = dict_search('match.right', data['expr'][0])
translation_address = dict_search('dnat.addr.prefix.addr', data['expr'][3])
translation_mask = dict_search('dnat.addr.prefix.len', data['expr'][3])
self.assertEqual(f'{translation_address}/{translation_mask}', translation_prefix)
self.assertEqual(iface, 'eth1')
def test_source_nat66_required_translation_prefix(self):
# T2813: Ensure translation address is specified
rule = '5'
source_prefix = 'fc00::/64'
self.cli_set(src_path + ['rule', rule, 'source', 'prefix', source_prefix])
# check validate() - outbound-interface must be defined
with self.assertRaises(ConfigSessionError):
self.cli_commit()
self.cli_set(src_path + ['rule', rule, 'outbound-interface', 'eth0'])
# check validate() - translation address not specified
with self.assertRaises(ConfigSessionError):
self.cli_commit()
self.cli_set(src_path + ['rule', rule, 'translation', 'address', 'masquerade'])
self.cli_commit()
def test_source_nat66_protocol(self):
translation_address = '2001:db8:1111::1'
source_prefix = '2001:db8:2222::/64'
dport = '9999'
sport = '8080'
tport = '80'
proto = 'tcp'
self.cli_set(src_path + ['rule', '1', 'outbound-interface', 'eth1'])
self.cli_set(src_path + ['rule', '1', 'destination', 'port', dport])
self.cli_set(src_path + ['rule', '1', 'source', 'prefix', source_prefix])
self.cli_set(src_path + ['rule', '1', 'source', 'port', sport])
self.cli_set(src_path + ['rule', '1', 'protocol', proto])
self.cli_set(src_path + ['rule', '1', 'translation', 'address', translation_address])
self.cli_set(src_path + ['rule', '1', 'translation', 'port', tport])
# check validate() - outbound-interface must be defined
self.cli_commit()
nftables_search = [
['oifname "eth1"', 'ip6 saddr 2001:db8:2222::/64 tcp dport { 9999 } tcp sport { 8080 } snat to 2001:db8:1111::1:80']
]
self.verify_nftables(nftables_search, 'ip6 nat')
def test_nat66_no_rules(self):
# T3206: deleting all rules but keep the direction 'destination' or
# 'source' resulteds in KeyError: 'rule'.
#
# Test that both 'nat destination' and 'nat source' nodes can exist
# without any rule
self.cli_set(src_path)
self.cli_set(dst_path)
self.cli_commit()
if __name__ == '__main__':
unittest.main(verbosity=2)
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