linux-kernel - Re: [PATCH net 2/2] net: bridge: Get SIOCGIFBR/SIOCSIFBR ioctl working in compat mode

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Date:   Thu, 23 Dec 2021 08:59:44 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Remi Pommarel <repk@...plefau.lt>
Cc:     netdev@...r.kernel.org, Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: bridge: Get SIOCGIFBR/SIOCSIFBR ioctl
 working in compat mode

On Thu, 23 Dec 2021 16:31:39 +0100 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>

Since Arnd said this is not supposed to be backported I presume it
should go to net-next?