[Bridge] [PATCH net v2] net: bridge: fix flags interpretation for extern learn fdb entries

Vladimir Oltean vladimir.oltean at nxp.com
Tue Aug 10 13:50:09 UTC 2021

On Tue, Aug 10, 2021 at 02:00:10PM +0300, Nikolay Aleksandrov wrote:
> From: Nikolay Aleksandrov <nikolay at nvidia.com>
> Ignore fdb flags when adding port extern learn entries and always set
> BR_FDB_LOCAL flag when adding bridge extern learn entries. This is
> closest to the behaviour we had before and avoids breaking any use cases
> which were allowed.
> This patch fixes iproute2 calls which assume NUD_PERMANENT and were
> allowed before, example:
> $ bridge fdb add 00:11:22:33:44:55 dev swp1 extern_learn
> Extern learn entries are allowed to roam, but do not expire, so static
> or dynamic flags make no sense for them.
> Also add a comment for future reference.
> Fixes: eb100e0e24a2 ("net: bridge: allow to add externally learned entries from user-space")
> Fixes: 0541a6293298 ("net: bridge: validate the NUD_PERMANENT bit when adding an extern_learn FDB entry")
> Reviewed-by: Ido Schimmel <idosch at nvidia.com>
> Tested-by: Ido Schimmel <idosch at nvidia.com>
> Signed-off-by: Nikolay Aleksandrov <nikolay at nvidia.com>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean at nxp.com>

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