libtins  4.0
 All Classes Namespaces Functions Variables Typedefs Enumerations Enumerator Friends Pages
checksum_utils.h
1 /*
2  * Copyright (c) 2017, Matias Fontanini
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  * * Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * * Redistributions in binary form must reproduce the above
12  * copyright notice, this list of conditions and the following disclaimer
13  * in the documentation and/or other materials provided with the
14  * distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  */
29 
30 #ifndef TINS_CHECKSUM_UTILS_H
31 #define TINS_CHECKSUM_UTILS_H
32 
33 #include <stdint.h>
34 #include "../macros.h"
35 
36 namespace Tins {
37 
38 class IPv4Address;
39 class IPv6Address;
40 
41 namespace Utils {
42 
53 TINS_API uint32_t do_checksum(const uint8_t* start, const uint8_t* end);
54 
65 TINS_API uint16_t sum_range(const uint8_t* start, const uint8_t* end);
66 
76 TINS_API uint32_t pseudoheader_checksum(IPv4Address source_ip,
77  IPv4Address dest_ip,
78  uint16_t len,
79  uint16_t flag);
80 
90 TINS_API uint32_t pseudoheader_checksum(IPv6Address source_ip,
91  IPv6Address dest_ip,
92  uint16_t len,
93  uint16_t flag);
94 
101 TINS_API uint32_t crc32(const uint8_t* data, uint32_t data_size);
102 
103 } // Utils
104 } // Tins
105 
106 #endif // TINS_CHECKSUM_UTILS_H
TINS_API uint32_t crc32(const uint8_t *data, uint32_t data_size)
Returns the 32 bit crc of the given buffer.
Definition: checksum_utils.cpp:112
TINS_API uint16_t sum_range(const uint8_t *start, const uint8_t *end)
Computes the 16 bit sum of the input buffer.
Definition: checksum_utils.cpp:49
Abstraction of an IPv4 address.
Definition: ip_address.h:44
TINS_API uint32_t do_checksum(const uint8_t *start, const uint8_t *end)
Does the 16 bits sum of all 2 bytes elements between start and end.
Definition: checksum_utils.cpp:45
Definition: ipv6_address.h:44
TINS_API uint32_t pseudoheader_checksum(IPv4Address source_ip, IPv4Address dest_ip, uint16_t len, uint16_t flag)
Performs the pseudo header checksum used in TCP and UDP PDUs.
Definition: checksum_utils.cpp:94