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
|
/*
* 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
{
u32 spi;
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* */
#define ESP_SEQ_MAX (4294967295UL)
#define ESP_MAX_BLOCK_SIZE (16)
#define ESP_MAX_ICV_SIZE (16)
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_EXTENDED_SEQ_NUM (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 unsigned int
hmac_calc (vlib_main_t * vm, ipsec_sa_t * sa, u8 * data, int data_len,
u8 * signature)
{
vnet_crypto_op_t _op, *op = &_op;
if (PREDICT_FALSE (sa->integ_op_type == 0))
return 0;
op->op = sa->integ_op_type;
op->key = sa->integ_key.data;
op->key_len = sa->integ_key.len;
op->src = data;
op->len = data_len;
op->dst = signature;
op->hmac_trunc_len = sa->integ_trunc_size;
if (ipsec_sa_is_set_USE_EXTENDED_SEQ_NUM (sa))
{
u32 seq_hi = clib_host_to_net_u32 (sa->seq_hi);
op->len += 4;
clib_memcpy (data + data_len, &seq_hi, 4);
}
vnet_crypto_process_ops (vm, op, 1);
return sa->integ_trunc_size;
}
#endif /* __ESP_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
