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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 vyos.configsession import ConfigSession
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(unittest.TestCase):
def setUp(self):
# ensure we can also run this test on a live system - so lets clean
# out the current configuration :)
self.session = ConfigSession(os.getpid())
self.session.delete(base_path)
def tearDown(self):
self.session.delete(base_path)
self.session.commit()
def test_source_nat66(self):
source_prefix = 'fc00::/64'
translation_prefix = 'fc01::/64'
self.session.set(src_path + ['rule', '1', 'outbound-interface', 'eth1'])
self.session.set(src_path + ['rule', '1', 'source', 'prefix', source_prefix])
self.session.set(src_path + ['rule', '1', 'translation', 'prefix', translation_prefix])
# check validate() - outbound-interface must be defined
self.session.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])
translation_address = dict_search('snat.addr.prefix.addr', data['expr'][3])
translation_mask = dict_search('snat.addr.prefix.len', data['expr'][3])
self.assertEqual(iface, 'eth1')
# check for translation address
self.assertEqual(f'{translation_address}/{translation_mask}', translation_prefix)
self.assertEqual(f'{address}/{mask}', source_prefix)
def test_destination_nat66(self):
source_address = 'fc00::1'
translation_address = 'fc01::1'
self.session.set(dst_path + ['rule', '1', 'inbound-interface', 'eth1'])
self.session.set(dst_path + ['rule', '1', 'destination', 'address', source_address])
self.session.set(dst_path + ['rule', '1', 'translation', 'address', translation_address])
# check validate() - outbound-interface must be defined
self.session.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])
dnat_addr = dict_search('dnat.addr', data['expr'][3])
self.assertEqual(dnat_addr, translation_address)
self.assertEqual(iface, 'eth1')
def test_snat_required_translation_prefix(self):
# T2813: Ensure translation address is specified
rule = '5'
source_prefix = 'fc00::/64'
translation_prefix = 'fc00:2::/64'
self.session.set(src_path + ['rule', rule, 'source', 'prefix', source_prefix])
# check validate() - outbound-interface must be defined
with self.assertRaises(ConfigSessionError):
self.session.commit()
self.session.set(src_path + ['rule', rule, 'outbound-interface', 'eth0'])
# check validate() - translation address not specified
with self.assertRaises(ConfigSessionError):
self.session.commit()
self.session.set(src_path + ['rule', rule, 'translation', 'prefix', translation_prefix])
self.session.commit()
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.session.set(src_path)
self.session.set(dst_path)
self.session.commit()
if __name__ == '__main__':
unittest.main(verbosity=2)
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