[XFRM] STATE: Introduce care-of address.

Care-of address is carried by state as a transformation option like
IPsec encryption/authentication algorithm.

Based on MIPL2 kernel patch.

Signed-off-by: Noriaki TAKAMIYA <takamiya@po.ntts.co.jp>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index aa93cc1..872a2a4 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -134,6 +134,9 @@
 	/* Data for encapsulator */
 	struct xfrm_encap_tmpl	*encap;
 
+	/* Data for care-of address */
+	xfrm_address_t	*coaddr;
+
 	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
 	struct xfrm_state	*tunnel;