#!/usr/bin/env python3 # # Copyright (C) 2019 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 . import os from sys import exit from copy import deepcopy from vyos.config import Config from vyos.ifconfig import VXLANIf, Interface from vyos import ConfigError from netifaces import interfaces default_config_data = { 'address': [], 'deleted': False, 'description': '', 'disable': False, 'group': '', 'intf': '', 'ip_arp_cache_tmo': 30, 'ip_disable_arp_filter': 1, 'ip_enable_arp_accept': 0, 'ip_enable_arp_announce': 0, 'ip_enable_arp_ignore': 0, 'ip_proxy_arp': 0, 'ipv6_forwarding': True, 'ipv6_dup_addr_detect': '1', 'link': '', 'mtu': 1450, 'remote': '', 'remote_port': 8472, # The Linux implementation of VXLAN pre-dates # the IANA's selection of a standard destination port 'vni': '' } def get_config(): vxlan = deepcopy(default_config_data) conf = Config() # determine tagNode instance if 'VYOS_TAGNODE_VALUE' not in os.environ: raise ConfigError('Interface (VYOS_TAGNODE_VALUE) not specified') vxlan['intf'] = os.environ['VYOS_TAGNODE_VALUE'] # Check if interface has been removed if not conf.exists('interfaces vxlan ' + vxlan['intf']): vxlan['deleted'] = True return vxlan # set new configuration level conf.set_level('interfaces vxlan ' + vxlan['intf']) # retrieve configured interface addresses if conf.exists('address'): vxlan['address'] = conf.return_values('address') # retrieve interface description if conf.exists('description'): vxlan['description'] = conf.return_value('description') # Disable this interface if conf.exists('disable'): vxlan['disable'] = True # VXLAN multicast grou if conf.exists('group'): vxlan['group'] = conf.return_value('group') # ARP cache entry timeout in seconds if conf.exists('ip arp-cache-timeout'): vxlan['ip_arp_cache_tmo'] = int(conf.return_value('ip arp-cache-timeout')) # ARP filter configuration if conf.exists('ip disable-arp-filter'): vxlan['ip_disable_arp_filter'] = 0 # ARP enable accept if conf.exists('ip enable-arp-accept'): vxlan['ip_enable_arp_accept'] = 1 # ARP enable announce if conf.exists('ip enable-arp-announce'): vxlan['ip_enable_arp_announce'] = 1 # ARP enable ignore if conf.exists('ip enable-arp-ignore'): vxlan['ip_enable_arp_ignore'] = 1 # Enable proxy-arp on this interface if conf.exists('ip enable-proxy-arp'): vxlan['ip_proxy_arp'] = 1 # Disable IPv6 forwarding on this interface if conf.exists('ipv6 disable-forwarding'): vxlan['ipv6_forwarding'] = False # IPv6 Duplicate Address Detection (DAD) tries if conf.exists('ipv6 dup-addr-detect-transmits'): vxlan['ipv6_dup_addr_detect'] = conf.return_value('dup-addr-detect-transmits') # VXLAN underlay interface if conf.exists('link'): vxlan['link'] = conf.return_value('link') # Maximum Transmission Unit (MTU) if conf.exists('mtu'): vxlan['mtu'] = int(conf.return_value('mtu')) # Remote address of VXLAN tunnel if conf.exists('remote'): vxlan['remote'] = conf.return_value('remote') # Remote port of VXLAN tunnel if conf.exists('port'): vxlan['remote_port'] = int(conf.return_value('port')) # Virtual Network Identifier if conf.exists('vni'): vxlan['vni'] = conf.return_value('vni') return vxlan def verify(vxlan): if vxlan['deleted']: # bail out early return None if vxlan['mtu'] < 1500: print('WARNING: RFC7348 recommends VXLAN tunnels preserve a 1500 byte MTU') if vxlan['group']: if not vxlan['link']: raise ConfigError('Multicast VXLAN requires an underlaying interface ') if not vxlan['link'] in interfaces(): raise ConfigError('VXLAN source interface does not exist') if not (vxlan['group'] or vxlan['remote']): raise ConfigError('Group or remote must be configured') if not vxlan['vni']: raise ConfigError('Must configure VNI for VXLAN') if vxlan['link']: # VXLAN adds a 50 byte overhead - we need to check the underlaying MTU # if our configured MTU is at least 50 bytes less underlay_mtu = int(Interface(vxlan['link']).get_mtu()) if underlay_mtu < (vxlan['mtu'] + 50): raise ConfigError('VXLAN has a 50 byte overhead, underlaying device ' \ 'MTU is to small ({})'.format(underlay_mtu)) return None def generate(vxlan): return None def apply(vxlan): # Check if the VXLAN interface already exists if vxlan['intf'] in interfaces(): v = VXLANIf(vxlan['intf']) # VXLAN is super picky and the tunnel always needs to be recreated, # thus we can simply always delete it first. v.remove() if not vxlan['deleted']: # VXLAN interface needs to be created on-block # instead of passing a ton of arguments, I just use a dict # that is managed by vyos.ifconfig conf = deepcopy(VXLANIf.get_config()) # Assign VXLAN instance configuration parameters to config dict conf['vni'] = vxlan['vni'] conf['group'] = vxlan['group'] conf['dev'] = vxlan['link'] conf['remote'] = vxlan['remote'] conf['port'] = vxlan['remote_port'] # Finally create the new interface v = VXLANIf(vxlan['intf'], **conf) # update interface description used e.g. by SNMP v.set_alias(vxlan['description']) # Maximum Transfer Unit (MTU) v.set_mtu(vxlan['mtu']) # configure ARP cache timeout in milliseconds v.set_arp_cache_tmo(vxlan['ip_arp_cache_tmo']) # configure ARP filter configuration v.set_arp_filter(vxlan['ip_disable_arp_filter']) # configure ARP accept v.set_arp_accept(vxlan['ip_enable_arp_accept']) # configure ARP announce v.set_arp_announce(vxlan['ip_enable_arp_announce']) # configure ARP ignore v.set_arp_ignore(vxlan['ip_enable_arp_ignore']) # Enable proxy-arp on this interface v.set_proxy_arp(vxlan['ip_proxy_arp']) # Disable IPv6 forwarding on this interface v.set_ipv6_forwarding(vxlan['ipv6_forwarding']) # IPv6 Duplicate Address Detection (DAD) tries v.set_ipv6_dad_messages(vxlan['ipv6_dup_addr_detect']) # Configure interface address(es) - no need to implicitly delete the # old addresses as they have already been removed by deleting the # interface above for addr in vxlan['address']: v.add_addr(addr) # As the bond interface is always disabled first when changing # parameters we will only re-enable the interface if it is not # administratively disabled if not vxlan['disable']: v.set_admin_state('up') return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)