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Date:   Mon, 31 Oct 2022 18:43:11 +0100
From:   Guillaume Nault <>
To:     Hangbin Liu <>
Cc:, "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Ido Schimmel <>,
        Petr Machata <>,
        Florent Fourcot <>,
        Nikolay Aleksandrov <>,
        Nicolas Dichtel <>,
        David Ahern <>
Subject: Re: [PATCHv7 net-next 0/4] rtnetlink: Honour NLM_F_ECHO flag in
 rtnl_{new, del}link

On Fri, Oct 28, 2022 at 04:42:20AM -0400, Hangbin Liu wrote:
> Netlink messages are used for communicating between user and kernel space.
> When user space configures the kernel with netlink messages, it can set the
> NLM_F_ECHO flag to request the kernel to send the applied configuration back
> to the caller. This allows user space to retrieve configuration information
> that are filled by the kernel (either because these parameters can only be
> set by the kernel or because user space let the kernel choose a default
> value).
> The kernel has support this feature in some places like RTM_{NEW, DEL}ADDR,
> RTM_{NEW, DEL}ROUTE. This patch set handles NLM_F_ECHO flag and send link
> info back after rtnl_{new, del}link.

Reviewed-by: Guillaume Nault <>

Thanks Hangbin!

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