Merge branch 'vxlan-fix-default-fdb-entry-user-space-notify-ordering-race'

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Roopa Prabhu says:

====================
vxlan: fix default fdb entry user-space notify ordering/race

Problem:
In vxlan_newlink, a default fdb entry is added before register_netdev.
The default fdb creation function notifies user-space of the
fdb entry on the vxlan device which user-space does not know about yet.
(RTM_NEWNEIGH goes before RTM_NEWLINK for the same ifindex).

This series fixes the user-space netlink notification ordering issue
with the following changes:
- decouple fdb notify from fdb create.
- Move fdb notify after register_netdev.
- modify rtnl_configure_link to allow configuring a link early.
- Call rtnl_configure_link in vxlan newlink handler to notify
userspace about the newlink before fdb notify and
hence avoiding the user-space race.
====================

Fixes: afbd8bae9c ("vxlan: add implicit fdb entry for default destination")
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>

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This commit is contained in:

David S. Miller 2018-07-22 10:52:37 -07:00

parent 6e56830776 e99465b952

commit 0fb8d5a030

2 changed files with 93 additions and 42 deletions

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126

drivers/net/vxlan.c

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9

net/core/rtnetlink.c

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