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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* Copyright (c) 2015 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.
*/
#ifndef __ESP_H__
#define __ESP_H__
#include <vnet/ip/ip.h>
#include <vnet/crypto/crypto.h>
#include <vnet/ipsec/ipsec.h>
typedef struct
{
union
{
u32 spi;
u8 spi_bytes[4];
};
u32 seq;
u8 data[0];
} esp_header_t;
typedef struct
{
u8 pad_length;
u8 next_header;
} esp_footer_t;
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
ip4_header_t ip4;
esp_header_t esp;
}) ip4_and_esp_header_t;
/* *INDENT-ON* */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
ip4_header_t ip4;
udp_header_t udp;
esp_header_t esp;
}) ip4_and_udp_and_esp_header_t;
/* *INDENT-ON* */
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
ip6_header_t ip6;
esp_header_t esp;
}) ip6_and_esp_header_t;
/* *INDENT-ON* */
/**
* AES GCM Additional Authentication data
*/
typedef struct esp_aead_t_
{
/**
* for GCM: when using ESN it's:
* SPI, seq-hi, seg-low
* else
* SPI, seq-low
*/
u32 data[3];
} __clib_packed esp_aead_t;
#define ESP_SEQ_MAX (4294967295UL)
#define ESP_MAX_BLOCK_SIZE (16)
#define ESP_MAX_IV_SIZE (16)
#define ESP_MAX_ICV_SIZE (32)
u8 *format_esp_header (u8 * s, va_list * args);
/* TODO seq increment should be atomic to be accessed by multiple workers */
always_inline int
esp_seq_advance (ipsec_sa_t * sa)
{
if (PREDICT_TRUE (ipsec_sa_is_set_USE_ESN (sa)))
{
if (PREDICT_FALSE (sa->seq == ESP_SEQ_MAX))
{
if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) &&
sa->seq_hi == ESP_SEQ_MAX))
return 1;
sa->seq_hi++;
}
sa->seq++;
}
else
{
if (PREDICT_FALSE (ipsec_sa_is_set_USE_ANTI_REPLAY (sa) &&
sa->seq == ESP_SEQ_MAX))
return 1;
sa->seq++;
}
return 0;
}
always_inline void
esp_aad_fill (vnet_crypto_op_t * op,
const esp_header_t * esp, const ipsec_sa_t * sa)
{
esp_aead_t *aad;
aad = (esp_aead_t *) op->aad;
aad->data[0] = esp->spi;
if (ipsec_sa_is_set_USE_ESN (sa))
{
/* SPI, seq-hi, seq-low */
aad->data[1] = clib_host_to_net_u32 (sa->seq_hi);
aad->data[2] = esp->seq;
op->aad_len = 12;
}
else
{
/* SPI, seq-low */
aad->data[1] = esp->seq;
op->aad_len = 8;
}
}
#endif /* __ESP_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
