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+# Copyright 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 VethIf(Interface):
+ """
+ Abstraction of a Linux veth interface
+ """
+ iftype = 'veth'
+ definition = {
+ **Interface.definition,
+ **{
+ 'section': 'virtual-ethernet',
+ 'prefixes': ['veth', ],
+ 'bridgeable': True,
+ },
+ }
+
+ def _create(self):
+ """
+ Create veth interface in OS kernel. Interface is administrative
+ down by default.
+ """
+ # check before create, as we have 2 veth interfaces in our CLI
+ # interface virtual-ethernet veth0 peer-name 'veth1'
+ # interface virtual-ethernet veth1 peer-name 'veth0'
+ #
+ # but iproute2 creates the pair with one command:
+ # ip link add vet0 type veth peer name veth1
+ if self.exists(self.config['peer_name']):
+ return
+
+ # create virtual-ethernet interface
+ cmd = 'ip link add {ifname} type {type}'.format(**self.config)
+ cmd += f' peer name {self.config["peer_name"]}'
+ self._cmd(cmd)
+
+ # interface is always A/D down. It needs to be enabled explicitly
+ self.set_admin_state('down')