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tun: move internal flag defines out of uapi 

TUN_ flags are internal and never exposed
to userspace. Any application using it is almost
certainly buggy.

Move them out to tun.c.

Note: we remove these completely in follow-up patches,
this code movement is split out for ease of review.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-11-19 14:44:40 +02:00
parent 41e3e42108
commit 031f5e0338
2 changed files with 24 additions and 64 deletions
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72
drivers/net/tun.c
View File

@ -103,6 +103,21 @@ do { \
} while (0)
#endif
/* TUN device flags */
/* IFF_ATTACH_QUEUE is never stored in device flags,
* overload it to mean fasync when stored there.
*/
#define TUN_FASYNC IFF_ATTACH_QUEUE
#define TUN_NO_PI IFF_NO_PI
/* This flag has no real effect */
#define TUN_ONE_QUEUE IFF_ONE_QUEUE
#define TUN_PERSIST IFF_PERSIST
#define TUN_VNET_HDR IFF_VNET_HDR
#define TUN_TAP_MQ IFF_MULTI_QUEUE
#define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
IFF_MULTI_QUEUE)
#define GOODCOPY_LEN 128
#define FLT_EXACT_COUNT 8
@ -1521,32 +1536,7 @@ static struct proto tun_proto = {
static int tun_flags(struct tun_struct *tun)
{
int flags = 0;
if (tun->flags & TUN_TUN_DEV)
flags |= IFF_TUN;
else
flags |= IFF_TAP;
if (tun->flags & TUN_NO_PI)
flags |= IFF_NO_PI;
/* This flag has no real effect. We track the value for backwards
* compatibility.
*/
if (tun->flags & TUN_ONE_QUEUE)
flags |= IFF_ONE_QUEUE;
if (tun->flags & TUN_VNET_HDR)
flags |= IFF_VNET_HDR;
if (tun->flags & TUN_TAP_MQ)
flags |= IFF_MULTI_QUEUE;
if (tun->flags & TUN_PERSIST)
flags |= IFF_PERSIST;
return flags;
return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP);
}
static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
@ -1706,28 +1696,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
tun_debug(KERN_INFO, tun, "tun_set_iff\n");
if (ifr->ifr_flags & IFF_NO_PI)
tun->flags |= TUN_NO_PI;
else
tun->flags &= ~TUN_NO_PI;
/* This flag has no real effect. We track the value for backwards
* compatibility.
*/
if (ifr->ifr_flags & IFF_ONE_QUEUE)
tun->flags |= TUN_ONE_QUEUE;
else
tun->flags &= ~TUN_ONE_QUEUE;
if (ifr->ifr_flags & IFF_VNET_HDR)
tun->flags |= TUN_VNET_HDR;
else
tun->flags &= ~TUN_VNET_HDR;
if (ifr->ifr_flags & IFF_MULTI_QUEUE)
tun->flags |= TUN_TAP_MQ;
else
tun->flags &= ~TUN_TAP_MQ;
tun->flags = (tun->flags & ~TUN_FEATURES) |
(ifr->ifr_flags & TUN_FEATURES);
/* Make sure persistent devices do not get stuck in
* xoff state.
@ -1890,9 +1860,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
if (cmd == TUNGETFEATURES) {
/* Currently this just means: "what IFF flags are valid?".
* This is needed because we never checked for invalid flags on
* TUNSETIFF. */
return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
IFF_VNET_HDR | IFF_MULTI_QUEUE,
* TUNSETIFF.
*/
return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES,
(unsigned int __user*)argp);
} else if (cmd == TUNSETQUEUE)
return tun_set_queue(file, &ifr);

16
include/uapi/linux/if_tun.h
View File

@ -22,21 +22,11 @@
/* Read queue size */
#define TUN_READQ_SIZE 500
/* TUN device flags */
#define TUN_TUN_DEV 0x0001
#define TUN_TAP_DEV 0x0002
/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
#define TUN_TUN_DEV IFF_TUN
#define TUN_TAP_DEV IFF_TAP
#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)