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Commit 76975e9c authored by Pavel Emelyanov's avatar Pavel Emelyanov Committed by David S. Miller
Browse files

tun: Get skfilter layout 



The only thing we may have from tun device is the fprog, whic contains
the number of filter elements and a pointer to (user-space) memory
where the elements are. The program itself may not be available if the
device is persistent and detached.

Signed-off-by: default avatarPavel Emelyanov <xemul@parallels.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 849c9b6f

drivers/net/tun.c

+10 −0
Original line number Diff line number Diff line
@@ -2042,6 +2042,16 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
		tun_detach_filter(tun, tun->numqueues);

		break;



	case TUNGETFILTER:

		ret = -EINVAL;

		if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV)

			break;

		ret = -EFAULT;

		if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog)))

			break;

		ret = 0;

		break;



	default:

		ret = -EINVAL;

		break;

include/uapi/linux/if_tun.h

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ 
#define TUNSETVNETHDRSZ _IOW('T', 216, int)

#define TUNSETQUEUE  _IOW('T', 217, int)

#define TUNSETIFINDEX	_IOW('T', 218, unsigned int)

#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)



/* TUNSETIFF ifr flags */

#define IFF_TUN		0x0001