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
|
/*
* Copyright (c) 2008, 2011, 2015 Nicira, Inc.
*
* 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 CSUM_H
#define CSUM_H 1
#include <stddef.h>
#include <stdint.h>
#include "openvswitch/types.h"
struct in6_addr;
ovs_be16 csum(const void *, size_t);
uint32_t csum_continue(uint32_t partial, const void *, size_t);
ovs_be16 csum_finish(uint32_t partial);
ovs_be16 recalc_csum16(ovs_be16 old_csum, ovs_be16 old_u16, ovs_be16 new_u16);
ovs_be16 recalc_csum32(ovs_be16 old_csum, ovs_be32 old_u32, ovs_be32 new_u32);
ovs_be16 recalc_csum48(ovs_be16 old_csum, const struct eth_addr old_mac,
const struct eth_addr new_mac);
ovs_be16 recalc_csum128(ovs_be16 old_csum, ovs_16aligned_be32 old_u32[4],
const struct in6_addr *);
#ifndef __CHECKER__
/* Adds the 16 bits in 'new' to the partial IP checksum 'partial' and returns
* the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
* obtain the finished checksum, pass the return value to csum_finish().) */
static inline uint32_t
csum_add16(uint32_t partial, ovs_be16 new)
{
return partial + new;
}
/* Adds the 32 bits in 'new' to the partial IP checksum 'partial' and returns
* the updated checksum. (To start a new checksum, pass 0 for 'partial'. To
* obtain the finished checksum, pass the return value to csum_finish().) */
static inline uint32_t
csum_add32(uint32_t partial, ovs_be32 new)
{
return partial + (new >> 16) + (new & 0xffff);
}
#else
uint32_t csum_add16(uint32_t partial, ovs_be16);
uint32_t csum_add32(uint32_t partial, ovs_be32);
#endif
#endif /* csum.h */
|
