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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#ifndef _GRE_H_
#define _GRE_H_
#define GRE_CRC_PRESENT 0x10
#define GRE_ROUTING_PRESENT 0x08
#define GRE_KEY_PRESENT 0x04
#define GRE_SEQNUM_PRESENT 0x02
#define GRE_STRICT_ROUTE 0x01
struct gre_hdr {
uint8_t recur: 3; /* recur */
uint8_t bits: 5; /* bits: Checksum, Routing, Key, Sequence Number, strict Route */
uint8_t version: 3; /* Version: must be 0 */
uint8_t flags: 5; /* Flags: must be 0 */
uint16_t type; /* Protocol type */
uint32_t gre_id; /* Key ID */
} __attribute__((__packed__));
#endif /* _GRE_H_ */
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