Public bug reported:
Neutron looks up for vxlan parent devices by IFA_LABEL attribute returned from
pyroute2.
If I set up IPv4 overlay network, this works without issues.
But when I setup an IPv6 overlay, always the device with index 0
(usually "lo") is being returned by get_devices_with_ip because the
device structure returned for IPv6 addresses doesn't contain IFA_LABEL.
If IFA_LABEL is not found, neutron ip_lib.py tries to find the name of the
'owner' of the address by device index (index is already known here):
for ip_address in ip_addresses:
index = ip_address['index']
name = get_attr(ip_address, 'IFA_LABEL') or devices.get(index)
if not name:
device = get_devices_info(namespace, index=index)
if not device:
continue
name = device[0]['name']
However priviliged/agent/linux/ip_lib.py get_link_devices() doesn't use
the index kwarg correctly, and returns all devices in the system, and
the code above always returns the first device in the list.
My solution is now to transform get_link_devices() to pass arguments to
ip.get_links() correctly:
--- ip_lib.py.orig 2021-12-03 10:28:40.312266929 +0000
+++ ip_lib.py 2021-12-03 10:26:33.337486559 +0000
@@ -564,7 +564,10 @@
"""
try:
with get_iproute(namespace) as ip:
- return make_serializable(ip.get_links(**kwargs))
+ if "index" in kwargs:
+ return make_serializable(ip.get_links(kwargs['index']))
+ else:
+ return make_serializable(ip.get_links(**kwargs))
except OSError as e:
if e.errno == errno.ENOENT:
raise NetworkNamespaceNotFound(netns_name=namespace)
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1953139
Title:
On IPv6 overlay networks linuxbridge vxlans are created always on
loopback device
Status in neutron:
New
Bug description:
Neutron looks up for vxlan parent devices by IFA_LABEL attribute returned
from pyroute2.
If I set up IPv4 overlay network, this works without issues.
But when I setup an IPv6 overlay, always the device with index 0
(usually "lo") is being returned by get_devices_with_ip because the
device structure returned for IPv6 addresses doesn't contain
IFA_LABEL.
If IFA_LABEL is not found, neutron ip_lib.py tries to find the name of the
'owner' of the address by device index (index is already known here):
for ip_address in ip_addresses:
index = ip_address['index']
name = get_attr(ip_address, 'IFA_LABEL') or devices.get(index)
if not name:
device = get_devices_info(namespace, index=index)
if not device:
continue
name = device[0]['name']
However priviliged/agent/linux/ip_lib.py get_link_devices() doesn't
use the index kwarg correctly, and returns all devices in the system,
and the code above always returns the first device in the list.
My solution is now to transform get_link_devices() to pass arguments
to ip.get_links() correctly:
--- ip_lib.py.orig 2021-12-03 10:28:40.312266929 +0000
+++ ip_lib.py 2021-12-03 10:26:33.337486559 +0000
@@ -564,7 +564,10 @@
"""
try:
with get_iproute(namespace) as ip:
- return make_serializable(ip.get_links(**kwargs))
+ if "index" in kwargs:
+ return make_serializable(ip.get_links(kwargs['index']))
+ else:
+ return make_serializable(ip.get_links(**kwargs))
except OSError as e:
if e.errno == errno.ENOENT:
raise NetworkNamespaceNotFound(netns_name=namespace)
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