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interfaces-vxlan.py
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interfaces-vxlan.py
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#!/usr/bin/env python3
#
# Copyright (C) 2019-2020 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/>.
import os
from sys import exit
from netifaces import interfaces
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_mtu_ipv6
from vyos.configverify import verify_source_interface
from vyos.ifconfig import VXLANIf, Interface
from vyos import ConfigError
from vyos import airbag
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', 'vxlan']
vxlan = get_interface_dict(conf, base)
return vxlan
def verify(vxlan):
if 'deleted' in vxlan:
verify_bridge_delete(vxlan)
return None
if int(vxlan['mtu']) < 1500:
print('WARNING: RFC7348 recommends VXLAN tunnels preserve a 1500 byte MTU')
if 'group' in vxlan:
if 'source_interface' not in vxlan:
raise ConfigError('Multicast VXLAN requires an underlaying interface ')
verify_source_interface(vxlan)
if not any(tmp in ['group', 'remote', 'source_address'] for tmp in vxlan):
raise ConfigError('Group, remote or source-address must be configured')
if 'vni' not in vxlan:
raise ConfigError('Must configure VNI for VXLAN')
if 'source_interface' in vxlan:
# VXLAN adds a 50 byte overhead - we need to check the underlaying MTU
# if our configured MTU is at least 50 bytes less
lower_mtu = Interface(vxlan['source_interface']).get_mtu()
if lower_mtu < (int(vxlan['mtu']) + 50):
raise ConfigError('VXLAN has a 50 byte overhead, underlaying device ' \
f'MTU is to small ({lower_mtu} bytes)')
verify_mtu_ipv6(vxlan)
verify_address(vxlan)
return None
def generate(vxlan):
return None
def apply(vxlan):
# Check if the VXLAN interface already exists
if vxlan['ifname'] in interfaces():
v = VXLANIf(vxlan['ifname'])
# VXLAN is super picky and the tunnel always needs to be recreated,
# thus we can simply always delete it first.
v.remove()
if 'deleted' not in vxlan:
# This is a special type of interface which needs additional parameters
# when created using iproute2. Instead of passing a ton of arguments,
# use a dictionary provided by the interface class which holds all the
# options necessary.
conf = VXLANIf.get_config()
# Assign VXLAN instance configuration parameters to config dict
for tmp in ['vni', 'group', 'source_address', 'source_interface', 'remote', 'port']:
if tmp in vxlan:
conf[tmp] = vxlan[tmp]
# Finally create the new interface
v = VXLANIf(vxlan['ifname'], **conf)
v.update(vxlan)
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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