[IPSEC]: Add encapsulation family.

Signed-off-by: Miika Komu <miika@iki.fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@hiit.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 984e5c4..15ec19d 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -310,6 +310,8 @@
 /* Source address of tunnel. Ignored, if it is not a tunnel. */
 	xfrm_address_t		saddr;
 
+	unsigned short		encap_family;
+
 	__u32			reqid;
 
 /* Mode: transport, tunnel etc. */