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