netfilter: x_tables: add LED trigger target

Kernel module providing implementation of LED netfilter target.  Each
instance of the target appears as a led-trigger device, which can be
associated with one or more LEDs in /sys/class/leds/

Signed-off-by: Adam Nielsen <a.nielsen@shikadi.net>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

include/linux/netfilter/Kbuild

@@ -7,6 +7,7 @@ header-y += xt_CLASSIFY.h
 header-y += xt_CONNMARK.h
 header-y += xt_CONNSECMARK.h
 header-y += xt_DSCP.h
+header-y += xt_LED.h
 header-y += xt_MARK.h
 header-y += xt_NFLOG.h
 header-y += xt_NFQUEUE.h

include/linux/netfilter/xt_LED.h

@@ -0,0 +1,13 @@
+#ifndef _XT_LED_H
+#define _XT_LED_H
+
+struct xt_led_info {
+	char id[27];        /* Unique ID for this trigger in the LED class */
+	__u8 always_blink;  /* Blink even if the LED is already on */
+	__u32 delay;        /* Delay until LED is switched off after trigger */
+
+	/* Kernel data used in the module */
+	void *internal_data __attribute__((aligned(8)));
+};
+
+#endif /* _XT_LED_H */