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interfaces_virtual-ethernet.py
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interfaces_virtual-ethernet.py
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#!/usr/bin/env python3
#
# Copyright (C) 2022-2024 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from sys import exit
from vyos import ConfigError
from vyos import airbag
from vyos.config import Config
from vyos.configdict import get_interface_dict
from vyos.configverify import verify_address
from vyos.configverify import verify_bridge_delete
from vyos.configverify import verify_vrf
from vyos.ifconfig import VethIf
from vyos.utils.network import interface_exists
airbag.enable()
def get_config(config=None):
"""
Retrive CLI config as dictionary. Dictionary can never be empty, as at
least the interface name will be added or a deleted flag
"""
if config:
conf = config
else:
conf = Config()
base = ['interfaces', 'virtual-ethernet']
ifname, veth = get_interface_dict(conf, base)
# We need to know all other veth related interfaces as veth requires a 1:1
# mapping for the peer-names. The Linux kernel automatically creates both
# interfaces, the local one and the peer-name, but VyOS also needs a peer
# interfaces configrued on the CLI so we can assign proper IP addresses etc.
veth['other_interfaces'] = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
return veth
def verify(veth):
if 'deleted' in veth:
verify_bridge_delete(veth)
# Prevent to delete veth interface which used for another "vethX peer-name"
for iface, iface_config in veth['other_interfaces'].items():
if veth['ifname'] in iface_config['peer_name']:
ifname = veth['ifname']
raise ConfigError(
f'Cannot delete "{ifname}" used for "interface {iface} peer-name"'
)
return None
verify_vrf(veth)
verify_address(veth)
if 'peer_name' not in veth:
raise ConfigError(f'Remote peer name must be set for "{veth["ifname"]}"!')
peer_name = veth['peer_name']
ifname = veth['ifname']
if veth['peer_name'] not in veth['other_interfaces']:
raise ConfigError(f'Used peer-name "{peer_name}" on interface "{ifname}" ' \
'is not configured!')
if veth['other_interfaces'][peer_name]['peer_name'] != ifname:
raise ConfigError(
f'Configuration mismatch between "{ifname}" and "{peer_name}"!')
if peer_name == ifname:
raise ConfigError(
f'Peer-name "{peer_name}" cannot be the same as interface "{ifname}"!')
return None
def generate(peth):
return None
def apply(veth):
# Check if the Veth interface already exists
if 'rebuild_required' in veth or 'deleted' in veth:
if interface_exists(veth['ifname']):
p = VethIf(**veth)
p.remove()
if 'deleted' not in veth:
p = VethIf(**veth)
p.update(veth)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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