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

From: Dan Williams
Date: Wed Nov 19 2014 - 11:47:38 EST


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@xxxxxxxxxx>
> ---
> 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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