xfrm: use gre key as flow upper protocol info

The GRE Key field is intended to be used for identifying an individual
traffic flow within a tunnel. It is useful to be able to have XFRM
policy selector matches to have different policies for different
GRE tunnels.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/net/flow.h b/include/net/flow.h
index 0ac3fb5e0973..7196e6864b8d 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -67,6 +67,7 @@ struct flowi {
                 } dnports;
 
                 __be32          spi;
+                __be32          gre_key;
 
                 struct {
                         __u8    type;
@@ -78,6 +79,7 @@ struct flowi {
 #define fl_icmp_code    uli_u.icmpt.code
 #define fl_ipsec_spi    uli_u.spi
 #define fl_mh_type      uli_u.mht.type
+#define fl_gre_key      uli_u.gre_key
         __u32           secid;  /* used by xfrm; see secid.txt */
 } __attribute__((__aligned__(BITS_PER_LONG/8)));