usb: interface authorization: Introduces the default interface authorization

Interfaces are allowed per default.
This can disabled or enabled (again) by writing 0 or 1 to
/sys/bus/usb/devices/usbX/interface_authorized_default

Signed-off-by: Stefan Koch <stefan.koch10@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index d2784c10bfe2..36ce3d215cad 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -120,6 +120,7 @@ struct usb_hcd {
 #define HCD_FLAG_WAKEUP_PENDING         4       /* root hub is resuming? */
 #define HCD_FLAG_RH_RUNNING             5       /* root hub is running? */
 #define HCD_FLAG_DEAD                   6       /* controller has died? */
+#define HCD_FLAG_INTF_AUTHORIZED        7       /* authorize interfaces? */
 
         /* The flags can be tested using these macros; they are likely to
          * be slightly faster than test_bit().
@@ -131,6 +132,14 @@ struct usb_hcd {
 #define HCD_RH_RUNNING(hcd)     ((hcd)->flags & (1U << HCD_FLAG_RH_RUNNING))
 #define HCD_DEAD(hcd)           ((hcd)->flags & (1U << HCD_FLAG_DEAD))
 
+        /*
+         * Specifies if interfaces are authorized by default
+         * or they require explicit user space authorization; this bit is
+         * settable through /sys/class/usb_host/X/interface_authorized_default
+         */
+#define HCD_INTF_AUTHORIZED(hcd) \
+        ((hcd)->flags & (1U << HCD_FLAG_INTF_AUTHORIZED))
+
         /* Flags that get set only during HCD registration or removal. */
         unsigned                rh_registered:1;/* is root hub registered? */
         unsigned                rh_pollable:1;  /* may we poll the root hub? */