[XFRM] POLICY: Support netlink socket interface for sub policy.

Sub policy can be used through netlink socket.
PF_KEY uses main only and it is TODO to support sub.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 492fb98..14ecd19 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -230,6 +230,12 @@
 #define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
 };
 
+struct xfrm_userpolicy_type {
+	__u8		type;
+	__u16		reserved1;
+	__u8		reserved2;
+};
+
 /* Netlink message attributes.  */
 enum xfrm_attr_type_t {
 	XFRMA_UNSPEC,
@@ -248,6 +254,7 @@
 	XFRMA_SRCADDR,		/* xfrm_address_t */
 	XFRMA_COADDR,		/* xfrm_address_t */
 	XFRMA_LASTUSED,
+	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
 	__XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index d341603..c75b328 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -203,6 +203,7 @@
 		u32 proto;
 		u32 byid;
 		u32 aevent;
+		u32 type;
 	} data;
 
 	u32	seq;