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Vector Packet Processing
ah.h
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef __AH_H__
16 #define __AH_H__
17 
18 
19 #include <vnet/ip/ip.h>
20 #include <vnet/ipsec/ipsec.h>
21 
22 #include <openssl/hmac.h>
23 #include <openssl/rand.h>
24 #include <openssl/evp.h>
25 
26 
27 typedef struct
28 {
29  unsigned char nexthdr;
30  unsigned char hdrlen;
31  unsigned short reserved;
32  unsigned int spi;
33  unsigned int seq_no;
34  unsigned char auth_data[0];
35 } ah_header_t;
36 
37 
38 /* *INDENT-OFF* */
39 typedef CLIB_PACKED (struct {
40  ip4_header_t ip4;
41  ah_header_t ah;
42 }) ip4_and_ah_header_t;
43 /* *INDENT-ON* */
44 
45 /* *INDENT-OFF* */
46 typedef CLIB_PACKED (struct {
47  ip6_header_t ip6;
48  ah_header_t ah;
49 }) ip6_and_ah_header_t;
50 /* *INDENT-ON* */
51 
53 ah_calc_icv_padding_len (u8 icv_size, int is_ipv6)
54 {
55  ASSERT (0 == is_ipv6 || 1 == is_ipv6);
56  const u8 req_multiple = 4 + 4 * is_ipv6; // 4 for ipv4, 8 for ipv6
57  const u8 total_size = sizeof (ah_header_t) + icv_size;
58  return (req_multiple - total_size % req_multiple) % req_multiple;
59 }
60 
61 #endif /* __AH_H__ */
62 
63 /*
64  * fd.io coding-style-patch-verification: ON
65  *
66  * Local Variables:
67  * eval: (c-set-style "gnu")
68  * End:
69  */
unsigned char hdrlen
Definition: ah.h:30
unsigned char u8
Definition: types.h:56
unsigned int seq_no
Definition: ah.h:33
#define always_inline
Definition: clib.h:94
static u8 ah_calc_icv_padding_len(u8 icv_size, int is_ipv6)
Definition: ah.h:53
typedef CLIB_PACKED(struct{ip4_header_t ip4;ah_header_t ah;}) ip4_and_ah_header_t
unsigned char nexthdr
Definition: ah.h:29
unsigned short reserved
Definition: ah.h:31
#define ASSERT(truth)
Definition: ah.h:27
unsigned int spi
Definition: ah.h:32