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-rwxr-xr-xsrc/op_mode/cgnat.py75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/op_mode/cgnat.py b/src/op_mode/cgnat.py
new file mode 100755
index 000000000..a98269a15
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+++ b/src/op_mode/cgnat.py
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+#!/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 json
+import sys
+import typing
+
+from tabulate import tabulate
+
+import vyos.opmode
+
+from vyos.configquery import ConfigTreeQuery
+from vyos.utils.process import cmd
+
+CGNAT_TABLE = 'cgnat'
+
+
+def _get_raw_data():
+ """ Get CGNAT dictionary
+ """
+ cmd_output = cmd(f'nft --json list table ip {CGNAT_TABLE}')
+ data = json.loads(cmd_output)
+ return data
+
+
+def _get_formatted_output(data):
+ elements = data['nftables'][2]['map']['elem']
+ allocations = []
+ for elem in elements:
+ internal = elem[0] # internal
+ external = elem[1]['concat'][0] # external
+ start_port = elem[1]['concat'][1]['range'][0]
+ end_port = elem[1]['concat'][1]['range'][1]
+ port_range = f'{start_port}-{end_port}'
+ allocations.append((internal, external, port_range))
+
+ headers = ['Internal IP', 'External IP', 'Port range']
+ output = tabulate(allocations, headers, numalign="left")
+ return output
+
+
+def show_allocation(raw: bool):
+ config = ConfigTreeQuery()
+ if not config.exists('nat cgnat'):
+ raise vyos.opmode.UnconfiguredSubsystem('CGNAT is not configured')
+
+ if raw:
+ return _get_raw_data()
+
+ else:
+ raw_data = _get_raw_data()
+ return _get_formatted_output(raw_data)
+
+
+if __name__ == '__main__':
+ try:
+ res = vyos.opmode.run(sys.modules[__name__])
+ if res:
+ print(res)
+ except (ValueError, vyos.opmode.Error) as e:
+ print(e)
+ sys.exit(1)