netdev - Re: [PATCH net-next 2/4] net, neigh: Enable state migration between NUD_PERMANENT and NTF

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Date:   Tue, 12 Oct 2021 08:25:18 -0600
From:   David Ahern <dsahern@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net,
        kuba@...nel.org
Cc:     roopa@...dia.com, dsahern@...nel.org, m@...bda.lt,
        john.fastabend@...il.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] net, neigh: Enable state migration between
 NUD_PERMANENT and NTF_USE

On 10/11/21 6:12 AM, Daniel Borkmann wrote:
> Currently, it is not possible to migrate a neighbor entry between NUD_PERMANENT
> state and NTF_USE flag with a dynamic NUD state from a user space control plane.
> Similarly, it is not possible to add/remove NTF_EXT_LEARNED flag from an existing
> neighbor entry in combination with NTF_USE flag.
> 
> This is due to the latter directly calling into neigh_event_send() without any
> meta data updates as happening in __neigh_update(). Thus, to enable this use
> case, extend the latter with a NEIGH_UPDATE_F_USE flag where we break the
> NUD_PERMANENT state in particular so that a latter neigh_event_send() is able
> to re-resolve a neighbor entry.
> 

...

> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Acked-by: Roopa Prabhu <roopa@...dia.com>
> ---
>  include/net/neighbour.h |  1 +
>  net/core/neighbour.c    | 22 +++++++++++++---------
>  2 files changed, 14 insertions(+), 9 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>