merging kernel_pfkey plugin back from kernel-interface branch

src/include/linux/ipsec.h

@@ -3,7 +3,7 @@
 
 /* The definitions, required to talk to KAME racoon IKE. */
 
-#include "pfkeyv2.h"
+#include <linux/pfkeyv2.h>
 
 #define IPSEC_PORT_ANY		0
 #define IPSEC_ULPROTO_ANY	255
@@ -12,7 +12,8 @@
 enum {
 	IPSEC_MODE_ANY		= 0,	/* We do not support this for SA */
 	IPSEC_MODE_TRANSPORT	= 1,
-	IPSEC_MODE_TUNNEL	= 2
+	IPSEC_MODE_TUNNEL	= 2,
+	IPSEC_MODE_BEET         = 3
 };
 
 enum {