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: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 6acbdbc..60a1e93 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2042,6 +2042,16 @@
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;