-
Notifications
You must be signed in to change notification settings - Fork 4
/
gre.h
executable file
·51 lines (44 loc) · 2.13 KB
/
gre.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
/*
Copyright(c) 2010-2017 Intel Corporation.
Copyright(c) 2016-2018 Viosoft Corporation.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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_ */