1 files changed, 50 insertions, 0 deletions
diff --git a/python/vyos/ifconfig/loopback.py b/python/vyos/ifconfig/loopback.py
new file mode 100644
index 000000000..410a19dcf
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+++ b/python/vyos/ifconfig/loopback.py
@@ -0,0 +1,50 @@
+# 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
+
+
+class LoopbackIf(Interface):
+    """
+    The loopback device is a special, virtual network interface that your router
+    uses to communicate with itself.
+    """
+
+    default = {
+        'type': 'loopback',
+    }
+
+    def __init__(self, ifname, **kargs):
+        super().__init__(ifname, **kargs)
+
+    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)