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netns.py
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netns.py
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#!/usr/bin/env python3
#
# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
#
# 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 vyos.config import Config
from vyos.configdict import node_changed
from vyos.utils.process import call
from vyos.utils.dict import dict_search
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 network namespace "{name}", it '\
f'still has member interfaces!')
if 'name' in netns:
for name, config in netns['name'].items():
# no tests (yet)
pass
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)

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