1 files changed, 43 insertions, 0 deletions
diff --git a/src/migration-scripts/nat/7-to-8 b/src/migration-scripts/nat/7-to-8
new file mode 100644
index 0000000..9ae389e
--- /dev/null
+++ b/src/migration-scripts/nat/7-to-8
@@ -0,0 +1,43 @@
+# Copyright 2024 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+# T6345: random - In kernel 5.0 and newer this is the same as fully-random.
+#        In earlier kernels the port mapping will be randomized using a seeded
+#        MD5 hash mix using source and destination address and destination port.
+#        drop fully-random from CLI
+
+from vyos.configtree import ConfigTree
+
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(['nat']):
+        # Nothing to do
+        return
+
+    for direction in ['source', 'destination']:
+        # If a node doesn't exist, we obviously have nothing to do.
+        if not config.exists(['nat', direction]):
+            continue
+
+        # However, we also need to handle the case when a 'source' or 'destination' sub-node does exist,
+        # but there are no rules under it.
+        if not config.list_nodes(['nat', direction]):
+            continue
+
+        for rule in config.list_nodes(['nat', direction, 'rule']):
+            port_mapping = ['nat', direction, 'rule', rule, 'translation', 'options', 'port-mapping']
+            if config.exists(port_mapping):
+                tmp = config.return_value(port_mapping)
+                if tmp == 'fully-random':
+                    config.set(port_mapping, value='random')