blob: ee124f92ad6ac7804f5ace6f9220f73354a4a8de (
plain)
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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* Copyright (c) 2021-2022 Cisco and/or its affiliates.
* 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.
*/
/**
* @file protocol/ah.h
* @brief AH packet header
*/
#ifndef HICN_PROTOCOL_AH_H
#define HICN_PROTOCOL_AH_H
#include <hicn/common.h>
/*
* The TCP PSH flag is set to indicate TCP payload in fact contains a AH header
* with signature information for the packet
*/
#define AH_FLAG 0x10
/*
* The length of the AH struct must be 44 bytes.
*/
#define EXPECTED_AH_HDRLEN 44
typedef struct
{
u8 nh; // To match with reserved in IPSEC AH
// Length of the signature field. Note that the signature might be smaller
// than the field: the actual size is computed from the field size and
// signaturePadding.
u8 payloadlen;
union
{
u16 reserved;
struct
{
u8 validationAlgorithm;
u8 signaturePadding;
};
};
union
{
struct
{
u32 spi;
u32 seq;
};
// Unix timestamp indicating when the signature has been calculated
u8 timestamp_as_u8[8];
u16 timestamp_as_u16[4];
u32 timestamp_as_u32[2];
};
// ICV would follow
u8 keyId[32]; // Hash of pub key
/* 44 B + validationPayload */
u8 validationPayload[0]; // Holds the signature
} _ah_header_t;
#define AH_HDRLEN sizeof (_ah_header_t)
static_assert (EXPECTED_AH_HDRLEN == AH_HDRLEN,
"Size of AH Struct does not match its expected size.");
#endif /* HICN_PROTOCOL_AH_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
