netdev - Re: [PATCH v2 net-next] net: neigh: add netlink filtering based on LLADDR for dump

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Message-ID: <b84e51fa-f410-956e-7304-7a49d297f254@kernel.org>
Date:   Mon, 9 May 2022 19:38:58 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Florent Fourcot <florent.fourcot@...irst.fr>,
        netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH v2 net-next] net: neigh: add netlink filtering based on
 LLADDR for dump

On 5/9/22 2:56 PM, Florent Fourcot wrote:
> neighbours table dump supports today two filtering:
>  * based on interface index
>  * based on master index
> 
> This patch adds a new filtering, based on layer two address. That will
> help to replace something like it:
> 
>  ip neigh show | grep aa:11:22:bb:ee:ff
> 
> by a better command:
> 
>  ip neigh show lladdr aa:11:22:bb:ee:ff
> 

that is done by a GET without the NLM_F_DUMP flag set; doing a table
dump and filtering to get the one entry is wrong.