# Copyright 2019-2022 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. """ _persistent_addresses = ['127.0.0.1/8', '::1/128'] iftype = 'loopback' definition = { **Interface.definition, **{ 'section': 'loopback', 'prefixes': ['lo', ], 'bridgeable': True, } } 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 self._persistent_addresses: # 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://vyos.dev/T2034. continue self.del_addr(addr) def update(self, config): """ General helper function which works on a dictionary retrived by get_config_dict(). It's main intention is to consolidate the scattered interface setup code and provide a single point of entry when workin on any interface. """ address = config.get('address', []) # We must ensure that the loopback addresses are never deleted from the system for tmp in self._persistent_addresses: if tmp not in address: address.append(tmp) # Update IP address entry in our dictionary config.update({'address' : address}) # call base class super().update(config)