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veth.py
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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')

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