iptunnel: make TUNNEL_FLAGS available in uapi

ip l add dev tun type gretap external
ip r a 10.0.0.1 encap ip dst 192.168.152.171 id 1000 dev gretap

For gretap Key example when the command set the id but don't set the
TUNNEL_KEY flags. There is no key field in the send packet

In the lwtunnel situation, some TUNNEL_FLAGS should can be set by
userspace

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: wenxu

include/net/ip_tunnels.h

@@ -144,25 +144,6 @@ struct ip_tunnel {
 	bool			ignore_df;
 };
 
-#define TUNNEL_CSUM		__cpu_to_be16(0x01)
-#define TUNNEL_ROUTING		__cpu_to_be16(0x02)
-#define TUNNEL_KEY		__cpu_to_be16(0x04)
-#define TUNNEL_SEQ		__cpu_to_be16(0x08)
-#define TUNNEL_STRICT		__cpu_to_be16(0x10)
-#define TUNNEL_REC		__cpu_to_be16(0x20)
-#define TUNNEL_VERSION		__cpu_to_be16(0x40)
-#define TUNNEL_NO_KEY		__cpu_to_be16(0x80)
-#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
-#define TUNNEL_OAM		__cpu_to_be16(0x0200)
-#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)
-#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)
-#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000)
-#define TUNNEL_NOCACHE		__cpu_to_be16(0x2000)
-#define TUNNEL_ERSPAN_OPT	__cpu_to_be16(0x4000)
-
-#define TUNNEL_OPTIONS_PRESENT \
-		(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)
-
 struct tnl_ptk_info {
 	__be16 flags;
 	__be16 proto;

include/uapi/linux/if_tunnel.h

@@ -160,4 +160,24 @@ enum {
 };
 
 #define IFLA_VTI_MAX	(__IFLA_VTI_MAX - 1)
+
+#define TUNNEL_CSUM		__cpu_to_be16(0x01)
+#define TUNNEL_ROUTING		__cpu_to_be16(0x02)
+#define TUNNEL_KEY		__cpu_to_be16(0x04)
+#define TUNNEL_SEQ		__cpu_to_be16(0x08)
+#define TUNNEL_STRICT		__cpu_to_be16(0x10)
+#define TUNNEL_REC		__cpu_to_be16(0x20)
+#define TUNNEL_VERSION		__cpu_to_be16(0x40)
+#define TUNNEL_NO_KEY		__cpu_to_be16(0x80)
+#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)
+#define TUNNEL_OAM		__cpu_to_be16(0x0200)
+#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)
+#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)
+#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000)
+#define TUNNEL_NOCACHE		__cpu_to_be16(0x2000)
+#define TUNNEL_ERSPAN_OPT	__cpu_to_be16(0x4000)
+
+#define TUNNEL_OPTIONS_PRESENT \
+		(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)
+
 #endif /* _UAPI_IF_TUNNEL_H_ */