[XFRM]: Add XFRM_MODE_xxx for future use.

Transformation mode is used as either IPsec transport or tunnel.
It is required to add two more items, route optimization and inbound trigger
for Mobile IPv6.
Based on MIPL2 kernel patch.

This patch was also written by: Ville Nuorvala <vnuorval@tcs.hut.fi>

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 46a15c7..5154064 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -120,7 +120,9 @@
 
 #define XFRM_MODE_TRANSPORT 0
 #define XFRM_MODE_TUNNEL 1
-#define XFRM_MODE_MAX 2
+#define XFRM_MODE_ROUTEOPTIMIZATION 2
+#define XFRM_MODE_IN_TRIGGER 3
+#define XFRM_MODE_MAX 4
 
 /* Netlink configuration messages.  */
 enum {
@@ -247,7 +249,7 @@
 	__u32				seq;
 	__u32				reqid;
 	__u16				family;
-	__u8				mode; /* 0=transport,1=tunnel */
+	__u8				mode;		/* XFRM_MODE_xxx */
 	__u8				replay_window;
 	__u8				flags;
 #define XFRM_STATE_NOECN	1