linux-kernel - Re: [PATCH 1/3] tun: move internal flag defines out of uapi

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Date:	Wed, 19 Nov 2014 10:47:14 -0600
From:	Dan Williams <dcbw@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	davem@...emloft.net, Jason Wang <jasowang@...hat.com>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>,
	Tom Herbert <therbert@...gle.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Masatake YAMATO <yamato@...hat.com>, Xi Wang <xii@...gle.com>,
	netdev@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 1/3] tun: move internal flag defines out of uapi

On Wed, 2014-11-19 at 18:18 +0200, Michael S. Tsirkin wrote:
> TUN_ flags are internal and never exposed
> to userspace. Any application using it is almost
> certainly buggy.

Except for TUN_TUN_DEV and TUN_TAP_DEV and TUN_TYPE_MASK...  which we're
using (for some reason) in NetworkManager, though I'll happily convert
those to IFF_* instead.  It might be worth #defining those to their
IFF_* equivalents since their usage is not technically broken.

Dan

> Move them out to tun.c, we'll remove them in follow-up patches.
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/uapi/linux/if_tun.h | 14 --------------
>  drivers/net/tun.c           | 14 ++++++++++++++
>  2 files changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> index e9502dd..b82c276 100644
> --- a/include/uapi/linux/if_tun.h
> +++ b/include/uapi/linux/if_tun.h
> @@ -23,20 +23,6 @@
>  /* Read queue size */
>  #define TUN_READQ_SIZE	500
>  
> -/* TUN device flags */
> -#define TUN_TUN_DEV 	0x0001	
> -#define TUN_TAP_DEV	0x0002
> -#define TUN_TYPE_MASK   0x000f
> -
> -#define TUN_FASYNC	0x0010
> -#define TUN_NOCHECKSUM	0x0020
> -#define TUN_NO_PI	0x0040
> -/* This flag has no real effect */
> -#define TUN_ONE_QUEUE	0x0080
> -#define TUN_PERSIST 	0x0100	
> -#define TUN_VNET_HDR 	0x0200
> -#define TUN_TAP_MQ      0x0400
> -
>  /* Ioctl defines */
>  #define TUNSETNOCSUM  _IOW('T', 200, int) 
>  #define TUNSETDEBUG   _IOW('T', 201, int) 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 2e18ddd..81735f5 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -103,6 +103,20 @@ do {								\
>  } while (0)
>  #endif
>  
> +/* TUN device flags */
> +#define TUN_TUN_DEV 	0x0001
> +#define TUN_TAP_DEV	0x0002
> +#define TUN_TYPE_MASK   0x000f
> +
> +#define TUN_FASYNC	0x0010
> +#define TUN_NOCHECKSUM	0x0020
> +#define TUN_NO_PI	0x0040
> +/* This flag has no real effect */
> +#define TUN_ONE_QUEUE	0x0080
> +#define TUN_PERSIST 	0x0100
> +#define TUN_VNET_HDR 	0x0200
> +#define TUN_TAP_MQ      0x0400
> +
>  #define GOODCOPY_LEN 128
>  
>  #define FLT_EXACT_COUNT 8


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