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tun: Report "persist" flag to userspace

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The TUN_PERSIST flag is not reported at all -- both TUNGETIFF, and sysfs
"flags" attribute skip one. Knowing whether a device is persistent or not
is critical for checkpoint-restore, thus I propose to add the read-only
IFF_PERSIST one for this.

Setting this new IFF_PERSIST is hardly possible, as TUNSETIFF doesn't check
for unknown flags being zero and thus there can be trash.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2013-06-11 14:41:24 +04:00 committed by David S. Miller
parent 7c0cadc69c
commit 274038f8c9
2 changed files with 5 additions and 0 deletions
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3
drivers/net/tun.c
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@ -1530,6 +1530,9 @@ static int tun_flags(struct tun_struct *tun)
if (tun->flags & TUN_TAP_MQ)
flags |= IFF_MULTI_QUEUE;
if (tun->flags & TUN_PERSIST)
flags |= IFF_PERSIST;
return flags;
}

2
include/uapi/linux/if_tun.h
View file

@ -68,6 +68,8 @@
#define IFF_MULTI_QUEUE 0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400
/* read-only flag */
#define IFF_PERSIST 0x0800
/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */