Add support for setting phys-dev for VXLAN interfaces.

Add interface configuration option »vxlan-physdev« to set »dev« attribute
  of VXLAN interfaces and a check for the running configuration.

Signed-off-by: Maximilian Wilhelm <max@rfc2324.org>

addons/vxlan.py

@@ -32,6 +32,9 @@ class vxlan(moduleBase):
                             {'help' : 'vxlan remote ip',
                              'validvals' : ['<ipv4>', '<ipv6>'],
                              'example': ['vxlan-remoteip 172.16.22.127']},
+                        'vxlan-physdev' :
+                            {'help' : 'vxlan physical device',
+                             'example': ['vxlan-physdev eth1']},
                         'vxlan-learning' :
                             {'help' : 'vxlan learning yes/no',
                              'validvals' : ['yes', 'no', 'on', 'off'],
@@ -59,6 +62,14 @@ class vxlan(moduleBase):
                     self.log_warn('%s: multiple clagd-vxlan-anycast-ip lines, using first one'
                                   % (ifaceobj.name,))
                 vxlan._clagd_vxlan_anycast_ip = clagd_vxlan_list[0]
+
+
+        # If we should use a specific underlay device for the VXLAN
+        # tunnel make sure this device is set up before the VXLAN iface.
+        physdev = ifaceobj.get_attr_value_first('vxlan-physdev')
+        if physdev:
+            return [ physdev ]
+
         return None
 
     def _is_vxlan_device(self, ifaceobj):
@@ -72,6 +83,7 @@ class vxlan(moduleBase):
             anycastip = self._clagd_vxlan_anycast_ip
             group = ifaceobj.get_attr_value_first('vxlan-svcnodeip')
             local = ifaceobj.get_attr_value_first('vxlan-local-tunnelip')
+            physdev = ifaceobj.get_attr_value_first('vxlan-physdev')
             ageing = ifaceobj.get_attr_value_first('vxlan-ageing')
             learning = utils.get_onoff_bool(ifaceobj.get_attr_value_first('vxlan-learning'))
 
@@ -89,7 +101,8 @@ class vxlan(moduleBase):
                                    local=local,
                                    learning=learning,
                                    ageing=ageing,
-                                   group=group)
+                                   group=group,
+                                   physdev=physdev)
 
             remoteips = ifaceobj.get_attr_value('vxlan-remoteip')
             if not systemUtils.is_service_running(None, '/var/run/vxrd.pid'):
@@ -207,6 +220,11 @@ class vxlan(moduleBase):
         self._query_check_n_update(ifaceobj, ifaceobjcurr, 'vxlan-ageing',
                        ageing, vxlanattrs.get('ageing'))
 
+        physdev = ifaceobj.get_attr_value_first('vxlan-physdev')
+        if physdev:
+            self._query_check_n_update(ifaceobj, ifaceobjcurr, 'vxlan-physdev',
+                           physdev, vxlanattrs.get('physdev'))
+
     def _query_running(self, ifaceobjrunning):
         vxlanattrs = self.ipcmd.get_vxlandev_attrs(ifaceobjrunning.name)
         if not vxlanattrs:

ifupdown/netlink.py

@@ -94,24 +94,30 @@ class Netlink(utilsBase):
                             % (ifacename, vlanid, str(e)))
 
     def link_add_vxlan(self, ifacename, vxlanid, local=None, dstport=VXLAN_UDP_PORT,
-                       group=None, learning='on', ageing=None):
+                       group=None, learning='on', ageing=None, physdev=None):
         cmd = 'ip link add %s type vxlan id %s dstport %s' % (ifacename,
                                                               vxlanid,
                                                               dstport)
+
+
         cmd += ' local %s' % local if local else ''
         cmd += ' ageing %s' % ageing if ageing else ''
         cmd += ' remote %s' % group if group else ' noremote'
         cmd += ' nolearning' if learning == 'off' else ''
+        cmd += ' dev %s' % physdev if physdev else ''
         self.logger.info('%s: netlink: %s' % (ifacename, cmd))
         if ifupdownflags.flags.DRYRUN: return
         try:
+            if physdev:
+                physdev = self.get_iface_index (physdev)
             return self._nlmanager_api.link_add_vxlan(ifacename,
                                                       vxlanid,
                                                       dstport=dstport,
                                                       local=local,
                                                       group=group,
                                                       learning=learning,
-                                                      ageing=ageing)
+                                                      ageing=ageing,
+                                                      physdev=physdev)
         except Exception as e:
             raise Exception('netlink: %s: cannot create vxlan %s: %s'
                             % (ifacename, vxlanid, str(e)))

ifupdownaddons/iproute2.py

@@ -114,6 +114,7 @@ class iproute2(utilsBase):
                         linkattrs['kind'] = 'vxlan'
                         vattrs = {'vxlanid': citems[i + 2],
                                   'svcnode': None,
+                                  'physdev': None,
                                   'remote': [],
                                   'ageing': citems[i + 2],
                                   'learning': 'on'}
@@ -126,6 +127,8 @@ class iproute2(utilsBase):
                                 vattrs['ageing'] = citems[j + 1]
                             elif citems[j] == 'nolearning':
                                 vattrs['learning'] = 'off'
+                            elif citems[j] == 'dev':
+                                vattrs['physdev'] = citems[j + 1]
                         # get vxlan peer nodes if provisioned by user and not by vxrd
                         if not vxrd_running:
                             peers = self.get_vxlan_peers(ifname, vattrs['svcnode'])

nlmanager/nlmanager.py

@@ -643,7 +643,7 @@ class NetlinkManager(object):
         return self.tx_nlpacket_get_response(nbr)
 
     def link_add_vxlan(self, ifname, vxlanid, dstport=None, local=None,
-                       group=None, learning='on', ageing=None):
+                       group=None, learning='on', ageing=None, physdev=None):
 
         debug = RTM_NEWLINK in self.debug
 
@@ -654,6 +654,8 @@ class NetlinkManager(object):
             info_data[Link.IFLA_VXLAN_LOCAL] = local
         if group:
             info_data[Link.IFLA_VXLAN_GROUP] = group
+        if physdev:
+            info_data[Link.IFLA_VXLAN_LINK] = int (physdev)
 
         learning = 0 if learning == 'off' else 1
         info_data[Link.IFLA_VXLAN_LEARNING] = learning