After upgrading from pike to xena my IPv6 vxlan overlay networks with linuxbridge stopped working.
In neutron-linuxbridge-agent.log on the compute nodes I see:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 465, in daemon_loop
sync = self.process_network_devices(device_info)
File "/usr/local/lib/python3.8/dist-packages/osprofiler/profiler.py", line 160, in wrapper
result = f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 214, in process_network_devices
resync_a = self.treat_devices_added_updated(devices_added_updated)
File "/usr/local/lib/python3.8/dist-packages/osprofiler/profiler.py", line 160, in wrapper
result = f(*args, **kwargs)
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 231, in treat_devices_added_updated
self._process_device_if_exists(device_details)
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/agent/_common_agent.py", line 256, in _process_device_if_exists
interface_plugged = self.mgr.plug_interface(
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 582, in plug_interface
return self.add_tap_interface(network_id, network_segment.network_type,
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 521, in add_tap_interface
return False
File "/usr/local/lib/python3.8/dist-packages/oslo_utils/excutils.py", line 227, in __exit__
self.force_reraise()
File "/usr/local/lib/python3.8/dist-packages/oslo_utils/excutils.py", line 200, in force_reraise
raise self.value
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 511, in add_tap_interface
return self._add_tap_interface(network_id, network_type,
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 542, in _add_tap_interface
elif not self.ensure_physical_in_bridge(network_id,
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 485, in ensure_physical_in_bridge
return self.ensure_vxlan_bridge(network_id, segmentation_id, mtu)
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 260, in ensure_vxlan_bridge
interface = self.ensure_vxlan(segmentation_id, mtu)
File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 356, in ensure_vxlan
int_vxlan = self.ip.add_vxlan(interface, segmentation_id,
File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 303, in add_vxlan
privileged.create_interface(name, self.namespace, "vxlan", **kwargs)
File "/usr/local/lib/python3.8/dist-packages/oslo_privsep/priv_context.py", line 271, in _wrap
return self.channel.remote_call(name, args, kwargs,
File "/usr/local/lib/python3.8/dist-packages/oslo_privsep/daemon.py", line 216, in remote_call
raise exc_type(*result[2])
OSError: illegal IP address string passed to inet_pton
After some debugging I've found that xena uses pyroute2 module to create interfaces and it tries to parse the IPv6 vxlan_group and vxlan_local addresses with AF_INET address family, despite that the ml2_conf.ini contains "overlay_ip_version = 6".
If I apply the following modification to ip_lib.py, the issue disappears, however I know that this is just working until I use IPv6 vxlan networks.
--- ip_lib.py.orig 2021-11-30 16:12:31.434975862 +0000
+++ ip_lib.py 2021-12-01 10:44:20.737971722 +0000
@@ -280,7 +280,7 @@
local=None, srcport=None, dstport=None, proxy=False):
kwargs = {'vxlan_id': vni}
if group:
- kwargs['vxlan_group'] = group
+ kwargs['vxlan_group6'] = group
if dev:
kwargs['physical_interface'] = dev
if ttl:
@@ -288,7 +288,7 @@
if tos:
kwargs['vxlan_tos'] = tos
if local:
- kwargs['vxlan_local'] = local
+ kwargs['vxlan_local6'] = local
if proxy:
kwargs['vxlan_proxy'] = proxy
# tuple: min,max
Is there any solution to use IPv6 overlay networks without issues?
Hi, thanks for the bug report.
After some digging I found where pyroute2 ip.link for VXLAN have all possible params:
https:/
I am not sure which pyroute2 is installed for your xena env.
Perhaps the simplest way is similar to your suggestion, but check ip family from local, and call privsep.
If you would like to and have time please propose the patch (to master, we can backport from master only) or I can propose as well.