linux-kernel - Re: [PATCH 1/1] include/uapi/linux/sockios.h: mark SIOCRTMSG unused

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Message-ID: <5683BC9F.7060603@gmx.de>
Date:	Wed, 30 Dec 2015 12:14:39 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] include/uapi/linux/sockios.h: mark SIOCRTMSG unused

On 12/30/2015 11:56 AM, Michael Kerrisk (man-pages) wrote:
> Hi Heinrich,
> 
> On 12/29/2015 11:22 PM, Heinrich Schuchardt wrote:
>> IOCTL SIOCRTMSG does nothing but return EINVAL.
>>
>> So comment it as unused.
> 
> Can you say something about how you confirmed this?
> It's not immediately obvious from the code.
> 
> Cheers,
> 
> Michael

grep -GHrn SIOCRTMSG

SIOCRTMSG is only used in:
* net/ipv4/af_inet.c
* include/uapi/linux/sockios.h

inet_ioctl calls ip_rt_ioctl.

ip_rt_ioctl only handles SIOCADDRT and SIOCDELRT and returns -EINVAL
otherwise.

cf.
http://lkml.iu.edu/hypermail/linux/kernel/0911.0/02636.html

Best regards

Heinrich

> 
> 
>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
>> ---
>>  include/uapi/linux/sockios.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/uapi/linux/sockios.h b/include/uapi/linux/sockios.h
>> index e888b1a..8e7890b 100644
>> --- a/include/uapi/linux/sockios.h
>> +++ b/include/uapi/linux/sockios.h
>> @@ -27,7 +27,7 @@
>>  /* Routing table calls. */
>>  #define SIOCADDRT	0x890B		/* add routing table entry	*/
>>  #define SIOCDELRT	0x890C		/* delete routing table entry	*/
>> -#define SIOCRTMSG	0x890D		/* call to routing system	*/
>> +#define SIOCRTMSG	0x890D		/* unused			*/
>>  
>>  /* Socket configuration controls. */
>>  #define SIOCGIFNAME	0x8910		/* get iface name		*/
>>
> 
> 

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