netdev - Re: [RFC PATCH net-next] rtnetlink: add RTNH_F_REJECT

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Date:   Thu, 11 Nov 2021 12:13:49 -0700
From:   David Ahern <dsahern@...il.com>
To:     Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>,
        netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Ido Schimmel <idosch@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
        Alexander Mikhalitsyn <alexander@...alicyn.com>
Subject: Re: [RFC PATCH net-next] rtnetlink: add RTNH_F_REJECT_MASK

On 11/11/21 9:02 AM, Alexander Mikhalitsyn wrote:
> diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
> index 5888492a5257..c15e591e5d25 100644
> --- a/include/uapi/linux/rtnetlink.h
> +++ b/include/uapi/linux/rtnetlink.h
> @@ -417,6 +417,9 @@ struct rtnexthop {
>  #define RTNH_COMPARE_MASK	(RTNH_F_DEAD | RTNH_F_LINKDOWN | \
>  				 RTNH_F_OFFLOAD | RTNH_F_TRAP)
>  
> +/* these flags can't be set by the userspace */
> +#define RTNH_F_REJECT_MASK	(RTNH_F_DEAD | RTNH_F_LINKDOWN)
> +
>  /* Macros to handle hexthops */

Userspace can not set any of the flags in RTNH_COMPARE_MASK.