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authorChristian Breunig <christian@breunig.cc>2024-05-22 21:31:32 +0200
committerMergify <37929162+mergify[bot]@users.noreply.github.com>2024-05-23 14:19:40 +0000
commit2c94114a3fe13ab9adc0be5b953a97584f0ab541 (patch)
tree61c6e0eba717d7a545507558da69c6a301ba86fb /src
parentc9945d09c2ade1f110a1f3b3dc9c14a92ea4aa0e (diff)
downloadvyos-1x-2c94114a3fe13ab9adc0be5b953a97584f0ab541.tar.gz
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nat: T6345: source NAT port mapping "fully-random" is superfluous in Kernel >=5.0
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. https://git.netfilter.org/nftables/commit/?id=fbe27464dee4588d906492749251454 (cherry picked from commit 7fe568ca1672f1dfbd2b56ee3ef7a6ab48b03070)
Diffstat (limited to 'src')
-rwxr-xr-xsrc/migration-scripts/nat/7-to-862
1 files changed, 62 insertions, 0 deletions
diff --git a/src/migration-scripts/nat/7-to-8 b/src/migration-scripts/nat/7-to-8
new file mode 100755
index 000000000..ab2ffa6d3
--- /dev/null
+++ b/src/migration-scripts/nat/7-to-8
@@ -0,0 +1,62 @@
+#!/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/>.
+
+# 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 sys import argv,exit
+from vyos.configtree import ConfigTree
+
+if len(argv) < 2:
+ print("Must specify file name!")
+ exit(1)
+
+file_name = argv[1]
+
+with open(file_name, 'r') as f:
+ config_file = f.read()
+
+config = ConfigTree(config_file)
+
+if not config.exists(['nat']):
+ # Nothing to do
+ exit(0)
+
+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')
+
+try:
+ with open(file_name, 'w') as f:
+ f.write(config.to_string())
+except OSError as e:
+ print(f'Failed to save the modified config: {e}')
+ exit(1)