netdev - Re: [PATCH net-next] net: bridge: Get SIOCGIFBR/SIOCSIFBR ioctl working in compat mode

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Date:   Mon, 27 Dec 2021 13:55:51 +0200
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Remi Pommarel <repk@...plefau.lt>, <netdev@...r.kernel.org>
CC:     Roopa Prabhu <roopa@...dia.com>, Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        <bridge@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: bridge: Get SIOCGIFBR/SIOCSIFBR ioctl
 working in compat mode

On 24/12/2021 13:46, Remi Pommarel wrote:
> In compat mode SIOC{G,S}IFBR ioctls were only supporting
> BRCTL_GET_VERSION returning an artificially version to spur userland
> tool to use SIOCDEVPRIVATE instead. But some userland tools ignore that
> and use SIOC{G,S}IFBR unconditionally as seen with busybox's brctl.
> 
> Example of non working 32-bit brctl with CONFIG_COMPAT=y:
> $ brctl show
> brctl: SIOCGIFBR: Invalid argument
> 
> Example of fixed 32-bit brctl with CONFIG_COMPAT=y:
> $ brctl show
> bridge name     bridge id               STP enabled     interfaces
> br0
> 
> Signed-off-by: Remi Pommarel <repk@...plefau.lt>
> Co-developed-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  net/bridge/br_ioctl.c | 75 ++++++++++++++++++++++++++++---------------
>  net/socket.c          | 20 ++----------
>  2 files changed, 52 insertions(+), 43 deletions(-)
> 

Looks good to me, thanks.
Acked-by: Nikolay Aleksandrov <nikolay@...dia.com>