netns: T3829: Ability to configure network namespaces

1 files changed, 118 insertions, 0 deletions

diff --git a/src/conf_mode/netns.py b/src/conf_mode/netns.py
new file mode 100755
index 000000000..0924eb616
--- /dev/null
+++ b/src/conf_mode/netns.py
@@ -0,0 +1,118 @@
+#!/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/>.
+
+import os
+
+from sys import exit
+from tempfile import NamedTemporaryFile
+
+from vyos.config import Config
+from vyos.configdict import node_changed
+from vyos.ifconfig import Interface
+from vyos.util import call
+from vyos.util import dict_search
+from vyos.util import get_interface_config
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+
+def netns_interfaces(c, match):
+    """
+    get NETNS bound interfaces
+    """
+    matched = []
+    old_level = c.get_level()
+    c.set_level(['interfaces'])
+    section = c.get_config_dict([], get_first_key=True)
+    for type in section:
+        interfaces = section[type]
+        for name in interfaces:
+            interface = interfaces[name]
+            if 'netns' in interface:
+                v = interface.get('netns', '')
+                if v == match:
+                    matched.append(name)
+
+    c.set_level(old_level)
+    return matched
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+
+    base = ['netns']
+    netns = conf.get_config_dict(base, get_first_key=True,
+                                       no_tag_node_value_mangle=True)
+
+    # determine which NETNS has been removed
+    for name in node_changed(conf, base + ['name']):
+        if 'netns_remove' not in netns:
+            netns.update({'netns_remove' : {}})
+
+        netns['netns_remove'][name] = {}
+        # get NETNS bound interfaces
+        interfaces = netns_interfaces(conf, name)
+        if interfaces: netns['netns_remove'][name]['interface'] = interfaces
+
+    return netns
+
+def verify(netns):
+    # ensure NETNS is not assigned to any interface
+    if 'netns_remove' in netns:
+        for name, config in netns['netns_remove'].items():
+            if 'interface' in config:
+                raise ConfigError(f'Can not remove NETNS "{name}", it still has '\
+                                  f'member interfaces!')
+
+    if 'name' in netns:
+        for name, config in netns['name'].items():
+            print(name)
+
+    return None
+
+
+def generate(netns):
+    if not netns:
+        return None
+
+    return None
+
+
+def apply(netns):
+
+    for tmp in (dict_search('netns_remove', netns) or []):
+        if os.path.isfile(f'/run/netns/{tmp}'):
+            call(f'ip netns del {tmp}')
+
+    if 'name' in netns:
+        for name, config in netns['name'].items():
+            if not os.path.isfile(f'/run/netns/{name}'):
+                call(f'ip netns add {name}')
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)