T160: Rebase and fixes for NAT64

 - Update the base (rebase)
 - Move include/nat64-protocol.xml.i => include/nat64/protocol.xml.i
 - Delete unwanted `write_json`, use `write_file` instead
 - Remove unnecessary deleting of default values for tagNodes T2665
 - Add smoketest

Example:
```
set interfaces ethernet eth0 address '192.168.122.14/24'
set interfaces ethernet eth0 address '192.168.122.10/24'
set interfaces ethernet eth2 address '2001:db8::1/64'

set nat64 source rule 100 source prefix '64:ff9b::/96'
set nat64 source rule 100 translation pool 10 address '192.168.122.10'
set nat64 source rule 100 translation pool 10 port '1-65535'
```

1 files changed, 102 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_nat64.py b/smoketest/scripts/cli/test_nat64.py
new file mode 100755
index 000000000..b5723ac7e
--- /dev/null
+++ b/smoketest/scripts/cli/test_nat64.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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 json
+import os
+import unittest
+
+from base_vyostest_shim import VyOSUnitTestSHIM
+from vyos.configsession import ConfigSessionError
+from vyos.utils.process import cmd
+from vyos.utils.dict import dict_search
+
+base_path = ['nat64']
+src_path = base_path + ['source']
+
+jool_nat64_config = '/run/jool/instance-100.json'
+
+
+class TestNAT64(VyOSUnitTestSHIM.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super(TestNAT64, 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()
+        self.assertFalse(os.path.exists(jool_nat64_config))
+
+    def test_snat64(self):
+        rule = '100'
+        translation_rule = '10'
+        prefix_v6 = '64:ff9b::/96'
+        pool = '192.0.2.10'
+        pool_port = '1-65535'
+
+        self.cli_set(src_path + ['rule', rule, 'source', 'prefix', prefix_v6])
+        self.cli_set(
+            src_path
+            + ['rule', rule, 'translation', 'pool', translation_rule, 'address', pool]
+        )
+        self.cli_set(
+            src_path
+            + ['rule', rule, 'translation', 'pool', translation_rule, 'port', pool_port]
+        )
+        self.cli_commit()
+
+        # Load the JSON file
+        with open(f'/run/jool/instance-{rule}.json', 'r') as json_file:
+            config_data = json.load(json_file)
+
+        # Assertions based on the content of the JSON file
+        self.assertEqual(config_data['instance'], f'instance-{rule}')
+        self.assertEqual(config_data['framework'], 'netfilter')
+        self.assertEqual(config_data['global']['pool6'], prefix_v6)
+        self.assertTrue(config_data['global']['manually-enabled'])
+
+        # Check the pool4 entries
+        pool4_entries = config_data.get('pool4', [])
+        self.assertIsInstance(pool4_entries, list)
+        self.assertGreater(len(pool4_entries), 0)
+
+        for entry in pool4_entries:
+            self.assertIn('protocol', entry)
+            self.assertIn('prefix', entry)
+            self.assertIn('port range', entry)
+
+            protocol = entry['protocol']
+            prefix = entry['prefix']
+            port_range = entry['port range']
+
+            if protocol == 'ICMP':
+                self.assertEqual(prefix, pool)
+                self.assertEqual(port_range, pool_port)
+            elif protocol == 'UDP':
+                self.assertEqual(prefix, pool)
+                self.assertEqual(port_range, pool_port)
+            elif protocol == 'TCP':
+                self.assertEqual(prefix, pool)
+                self.assertEqual(port_range, pool_port)
+            else:
+                self.fail(f'Unexpected protocol: {protocol}')
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)