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tun: TUNSETFEATURES to set gso features.

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ethtool is useful for setting (some) device fields, but it's
root-only.  Finer feature control is available through a tun-specific
ioctl.

(Includes Mark McLoughlin <markmc@redhat.com>'s fix to hold rtnl sem).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Max Krasnyansky <maxk@qualcomm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rusty Russell
2008-07-03 03:46:16 -07:00
committed by David S. Miller
parent 07240fd090
commit 5228ddc98f
2 changed files with 56 additions and 0 deletions
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7
include/linux/if_tun.h
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@@ -41,6 +41,7 @@
#define TUNSETLINK _IOW('T', 205, int)
#define TUNSETGROUP _IOW('T', 206, int)
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
@@ -48,6 +49,12 @@
#define IFF_NO_PI 0x1000
#define IFF_ONE_QUEUE 0x2000
/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
struct tun_pi {
unsigned short flags;
__be16 proto;