T6641: Add vyos-network-event-logger Service

The service parses and logs network events for improved monitoring and diagnostics.
Supported event types include:

- `RTM_NEWROUTE`, `RTM_DELROUTE`
- `RTM_NEWLINK`, `RTM_DELLINK`
- `RTM_NEWADDR`, `RTM_DELADDR`
- `RTM_NEWNEIGH`, `RTM_DELNEIGH`, `RTM_GETNEIGH`
- `RTM_NEWRULE`, `RTM_DELRULE`

Added operational mode commands for filtered log retrieval:
- `show log network-event <event-type> <interface>`: Retrieve logs filtered by event type and interface.
- `show interfaces <type> <name> event-log <event-type>`: Display interface-specific logs filtered by event type.

1 files changed, 65 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_service_monitoring_network_event.py b/smoketest/scripts/cli/test_service_monitoring_network_event.py
new file mode 100644
index 000000000..3c9b4bf7f
--- /dev/null
+++ b/smoketest/scripts/cli/test_service_monitoring_network_event.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2024 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 unittest
+from base_vyostest_shim import VyOSUnitTestSHIM
+from vyos.utils.file import read_json
+
+
+base_path = ['service', 'monitoring', 'network-event']
+
+
+def get_logger_config():
+    return read_json('/run/vyos-network-event-logger.conf')
+
+
+class TestMonitoringNetworkEvent(VyOSUnitTestSHIM.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super(TestMonitoringNetworkEvent, 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 test_network_event_log(self):
+        expected_config = {
+            'event': {
+                'route': {},
+                'link': {},
+                'addr': {},
+                'neigh': {},
+                'rule': {},
+            },
+            'queue_size': '10000'
+        }
+
+        self.cli_set(base_path + ['event', 'route'])
+        self.cli_set(base_path + ['event', 'link'])
+        self.cli_set(base_path + ['event', 'addr'])
+        self.cli_set(base_path + ['event', 'neigh'])
+        self.cli_set(base_path + ['event', 'rule'])
+        self.cli_set(base_path + ['queue-size', '10000'])
+        self.cli_commit()
+        self.assertEqual(expected_config, get_logger_config())
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)