-#include "vport-generic.h"
-
-/*
- * The GRE header is composed of a series of sections: a base and then a variable
- * number of options.
- */
-#define GRE_HEADER_SECTION 4
-
-struct gre_base_hdr {
- __be16 flags;
- __be16 protocol;
-};
-
-static void get_gre_param(const struct tnl_mutable_config *mutable,
- const struct ovs_key_ipv4_tunnel *tun_key,
- u32 *flags, u32 *tunnel_type, __be64 *out_key)
-{
- if (tun_key->ipv4_dst) {
- *flags = 0;
-
- if (tun_key->tun_flags & OVS_FLOW_TNL_F_KEY)
- *flags = TNL_F_OUT_KEY_ACTION;
- if (tun_key->tun_flags & OVS_FLOW_TNL_F_CSUM)
- *flags |= TNL_F_CSUM;
- *tunnel_type = TNL_T_PROTO_GRE;
- *out_key = tun_key->tun_id;
- } else {
- *flags = mutable->flags;
- *tunnel_type = mutable->key.tunnel_type;
- if (mutable->flags & TNL_F_OUT_KEY_ACTION)
- *out_key = tun_key->tun_id;
- else
- *out_key = mutable->out_key;
-
- }
-}
-
-static int gre_hdr_len(const struct tnl_mutable_config *mutable,
- const struct ovs_key_ipv4_tunnel *tun_key)
-{
- int len;
- u32 flags;
- u32 tunnel_type;
- __be64 out_key;
-
- get_gre_param(mutable, tun_key, &flags, &tunnel_type, &out_key);
- len = GRE_HEADER_SECTION;
-
- if (flags & TNL_F_CSUM)
- len += GRE_HEADER_SECTION;
-
- /* Set key for GRE64 tunnels, even when key if is zero. */
- if (out_key ||
- tunnel_type & TNL_T_PROTO_GRE64 ||
- flags & TNL_F_OUT_KEY_ACTION) {
-
- len += GRE_HEADER_SECTION;
- if (tunnel_type & TNL_T_PROTO_GRE64)
- len += GRE_HEADER_SECTION;
- }
- return len;
-}
-