netdev - Re: [PATCH] net: Add compat ioctl support for the ipv4 multicast ioctl SIOCGETSGCNT

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Date:	Sun, 30 Jan 2011 01:14:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com, kaber@...sh.net
Subject: Re: [PATCH] net: Add compat ioctl support for the ipv4 multicast
 ioctl SIOCGETSGCNT

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Sat, 29 Jan 2011 18:15:56 -0800

> 
> SIOCGETSGCNT is not a unique ioctl value as it it maps tio SIOCPROTOPRIVATE +1,
> which unfortunately means the existing infrastructure for compat networking
> ioctls is insufficient.  A trivial compact ioctl implementation would conflict
> with:
> 
> SIOCAX25ADDUID
> SIOCAIPXPRISLT
> SIOCGETSGCNT_IN6
> SIOCGETSGCNT
> SIOCRSSCAUSE
> SIOCX25SSUBSCRIP
> SIOCX25SDTEFACILITIES
> 
> To make this work I have updated the compat_ioctl decode path to mirror the
> the normal ioctl decode path.  I have added an ipv4 inet_compat_ioctl function
> so that I can have ipv4 specific compat ioctls.   I have added a compat_ioctl
> function into struct proto so I can break out ioctls by which kind of ip socket
> I am using.  I have added a compat_raw_ioctl function because SIOCGETSGCNT only
> works on raw sockets.  I have added a ipmr_compat_ioctl that mirrors the normal
> ipmr_ioctl.
> 
> This was necessary because unfortunately the struct layout for the SIOCGETSGCNT
> has unsigned longs in it so changes between 32bit and 64bit kernels.
> 
> This change was sufficient to run a 32bit ip multicast routing daemon on a
> 64bit kernel.
> 
> Reported-by: Bill Fenner <fenner@...stanetworks.com>
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

Thanks a lot for doing this work Eric, applied to net-2.6.
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