conntrack: T3579: initial implementation with XML and Python

1 files changed, 83 insertions, 0 deletions

diff --git a/src/conf_mode/conntrack.py b/src/conf_mode/conntrack.py
new file mode 100755
index 000000000..e834231cf
--- /dev/null
+++ b/src/conf_mode/conntrack.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 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/>.
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.util import cmd
+from vyos.util import run
+from vyos.util import process_named_running
+from vyos.template import render
+from vyos.xml import defaults
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+conntrack_config = r'/etc/modprobe.d/vyatta_nf_conntrack.conf'
+sysctl_file = r'/run/sysctl/10-vyos-conntrack.conf'
+
+def resync_conntrackd():
+    tmp = run('/usr/libexec/vyos/conf_mode/conntrack_sync.py')
+    if tmp > 0:
+        print('ERROR: error restarting conntrackd!')
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['system', 'conntrack']
+
+    conntrack = conf.get_config_dict(base, key_mangling=('-', '_'),
+                                     get_first_key=True)
+
+    # We have gathered the dict representation of the CLI, but there are default
+    # options which we need to update into the dictionary retrived.
+    default_values = defaults(base)
+    conntrack = dict_merge(default_values, conntrack)
+
+    return conntrack
+
+def verify(conntrack):
+    return None
+
+def generate(conntrack):
+    render(conntrack_config, 'conntrack/vyos_nf_conntrack.conf.tmpl', conntrack)
+    render(sysctl_file, 'conntrack/sysctl.conf.tmpl', conntrack)
+
+    return None
+
+def apply(conntrack):
+    if process_named_running('conntrackd'):
+        # Reload conntrack-sync daemon to fetch new sysctl values
+        resync_conntrackd()
+
+    # We silently ignore all errors
+    # See: https://bugzilla.redhat.com/show_bug.cgi?id=1264080
+    cmd(f'sysctl -f {sysctl_file}')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)