linux-kernel - Re: IFF_LOWER_UP does not fit in ifr

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Message-Id: <20090529205028.3e01786b.akpm@linux-foundation.org>
Date:	Fri, 29 May 2009 20:50:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Fredrik Arnerup" <fredrik.arnerup@...eware.tv>
Cc:	<linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: IFF_LOWER_UP does not fit in ifr_flags

On Thu, 28 May 2009 14:59:05 +0200 "Fredrik Arnerup" <fredrik.arnerup@...eware.tv> wrote:

> Documentation/networking/operstates.txt (and netdevice(7)) claims that
> the flags IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO can be read from user space
> using ioctl() with SIOCGIFFLAGS. Looking in include/linux/if.h however,
> the flags are returned in a struct ifreq in the field ifr_flags which
> is declared as a short, while the flags are defined as:
> 
> #define IFF_LOWER_UP    0x10000         /* driver signals L1 up         */
> #define IFF_DORMANT     0x20000         /* driver signals dormant       */
> #define IFF_ECHO        0x40000         /* echo sent packets            */
> 
> Those aren't shorts, are they? In net/core/dev.c dev_get_flags() returns
> an unsigned which is assigned to ifr_flags directly.
> 
> Looked at linux/kernel/git/stable/linux-2.6.29.y.git.
> CC me please.
> 

(cc netdev)
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