FD.io VPP  v19.04.2-12-g66b1689
Vector Packet Processing
ah.h
Go to the documentation of this file.
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 #include <vnet/ip/ip.h>
19 #include <vnet/ipsec/ipsec.h>
20 
21 typedef struct
22 {
23  unsigned char nexthdr;
24  unsigned char hdrlen;
25  unsigned short reserved;
26  unsigned int spi;
27  unsigned int seq_no;
28  unsigned char auth_data[0];
29 } ah_header_t;
30 
31 
32 /* *INDENT-OFF* */
33 typedef CLIB_PACKED (struct {
34  ip4_header_t ip4;
35  ah_header_t ah;
36 }) ip4_and_ah_header_t;
37 /* *INDENT-ON* */
38 
39 /* *INDENT-OFF* */
40 typedef CLIB_PACKED (struct {
41  ip6_header_t ip6;
42  ah_header_t ah;
43 }) ip6_and_ah_header_t;
44 /* *INDENT-ON* */
45 
47 ah_calc_icv_padding_len (u8 icv_size, int is_ipv6)
48 {
49  ASSERT (0 == is_ipv6 || 1 == is_ipv6);
50  const u8 req_multiple = 4 + 4 * is_ipv6; // 4 for ipv4, 8 for ipv6
51  const u8 total_size = sizeof (ah_header_t) + icv_size;
52  return (req_multiple - total_size % req_multiple) % req_multiple;
53 }
54 
55 #endif /* __AH_H__ */
56 
57 /*
58  * fd.io coding-style-patch-verification: ON
59  *
60  * Local Variables:
61  * eval: (c-set-style "gnu")
62  * End:
63  */
unsigned char hdrlen
Definition: ah.h:24
unsigned char u8
Definition: types.h:56
unsigned int seq_no
Definition: ah.h:27
#define always_inline
Definition: clib.h:98
static u8 ah_calc_icv_padding_len(u8 icv_size, int is_ipv6)
Definition: ah.h:47
typedef CLIB_PACKED(struct{ip4_header_t ip4;ah_header_t ah;}) ip4_and_ah_header_t
unsigned char nexthdr
Definition: ah.h:23
unsigned short reserved
Definition: ah.h:25
#define ASSERT(truth)
Definition: ah.h:21
unsigned int spi
Definition: ah.h:26