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loopback.py
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# Copyright 2019 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/>.
from vyos.ifconfig.interface import Interface
@Interface.register
class LoopbackIf(Interface):
"""
The loopback device is a special, virtual network interface that your router
uses to communicate with itself.
"""
default = {
'type': 'loopback',
}
definition = {
**Interface.definition,
**{
'section': 'loopback',
'prefixes': ['lo', ],
'bridgeable': True,
}
}
name = 'loopback'
def remove(self):
"""
Loopback interface can not be deleted from operating system. We can
only remove all assigned IP addresses.
Example:
>>> from vyos.ifconfig import Interface
>>> i = LoopbackIf('lo').remove()
"""
# remove all assigned IP addresses from interface
for addr in self.get_addr():
if addr in ["127.0.0.1/8", "::1/128"]:
# Do not allow deletion of the default loopback addresses as
# this will cause weird system behavior like snmp/ssh no longer
# operating as expected, see https://phabricator.vyos.net/T2034.
continue
self.del_addr(addr)

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