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authorChristian Poessinger <christian@poessinger.com>2019-09-05 19:35:43 +0200
committerChristian Poessinger <christian@poessinger.com>2019-09-06 12:56:56 +0200
commit98aafc8f704ef54b6ece514c038b6aea414df734 (patch)
tree747dd4507c513dd4f5a233294e6ce82b3096d6b8 /src/conf_mode/interface-vxlan.py
parentdcde45826501302fd5fc2fbfcc1c376c2d51ea3a (diff)
downloadvyos-1x-98aafc8f704ef54b6ece514c038b6aea414df734.tar.gz
vyos-1x-98aafc8f704ef54b6ece514c038b6aea414df734.zip
vxlan: T1636: initial rewrite with XML and Python
Tested using: Site 1 (VyOS 1.2.2) ------------------- set interfaces vxlan vxlan100 address '10.10.10.2/24' set interfaces vxlan vxlan100 remote '172.18.201.10' set interfaces vxlan vxlan100 vni '100' Site 2 (rewrite) ---------------- set interfaces vxlan vxlan100 address '10.10.10.1/24' set interfaces vxlan vxlan100 description 'VyOS VXLAN' set interfaces vxlan vxlan100 remote '172.18.202.10' set interfaces vxlan vxlan100 vni '100'
Diffstat (limited to 'src/conf_mode/interface-vxlan.py')
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diff --git a/src/conf_mode/interface-vxlan.py b/src/conf_mode/interface-vxlan.py
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+#!/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 <http://www.gnu.org/licenses/>.
+#
+
+from os import environ
+from sys import exit
+from copy import deepcopy
+
+from vyos.configdict import list_diff
+from vyos.config import Config
+from vyos.ifconfig import VXLANIf, Interface
+from vyos.interfaces import get_type_of_interface
+from vyos import ConfigError
+from netifaces import interfaces
+
+default_config_data = {
+ 'address': [],
+ 'address_remove': [],
+ 'deleted': False,
+ 'description': '',
+ 'disable': False,
+ 'group': '',
+ 'intf': '',
+ 'ip_arp_cache_tmo': 30,
+ 'ip_proxy_arp': 0,
+ 'link': '',
+ 'mtu': 1450,
+ 'remote': '',
+ 'remote_port': 8472 # The Linux implementation of VXLAN pre-dates
+ # the IANA's selection of a standard destination port
+}
+
+
+def get_config():
+ vxlan = deepcopy(default_config_data)
+ conf = Config()
+
+ # determine tagNode instance
+ try:
+ vxlan['intf'] = environ['VYOS_TAGNODE_VALUE']
+ except KeyError as E:
+ print("Interface not specified")
+
+ # 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')
+
+ # Determine interface addresses (currently effective) - to determine which
+ # address is no longer valid and needs to be removed from the interface
+ eff_addr = conf.return_effective_values('address')
+ act_addr = conf.return_values('address')
+ vxlan['address_remove'] = list_diff(eff_addr, act_addr)
+
+ # 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'))
+
+ # Enable proxy-arp on this interface
+ if conf.exists('ip enable-proxy-arp'):
+ vxlan['ip_proxy_arp'] = 1
+
+ # 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'] and not vxlan['link']:
+ raise ConfigError('Multicast VXLAN requires an underlaying interface ')
+
+ 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']).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'], config=conf)
+ # update interface description used e.g. by SNMP
+ v.ifalias = vxlan['description']
+ # Maximum Transfer Unit (MTU)
+ v.mtu = vxlan['mtu']
+
+ # configure ARP cache timeout in milliseconds
+ v.arp_cache_tmp = vxlan['ip_arp_cache_tmo']
+ # Enable proxy-arp on this interface
+ v.proxy_arp = vxlan['ip_proxy_arp']
+
+ # Configure interface address(es)
+ # - not longer required addresses get removed first
+ # - newly addresses will be added second
+ for addr in vxlan['address_remove']:
+ v.del_addr(addr)
+ 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.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)