Mistake on this page?
Report an issue in GitHub or email us
inet_chksum.h
Go to the documentation of this file.
1 /**
2  * @file
3  * IP checksum calculation functions
4  */
5 
6 /*
7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  * derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * This file is part of the lwIP TCP/IP stack.
33  *
34  * Author: Adam Dunkels <adam@sics.se>
35  *
36  */
37 #ifndef LWIP_HDR_INET_CHKSUM_H
38 #define LWIP_HDR_INET_CHKSUM_H
39 
40 #include "lwip/opt.h"
41 
42 #include "lwip/pbuf.h"
43 #include "lwip/ip_addr.h"
44 
45 /** Swap the bytes in an u16_t: much like lwip_htons() for little-endian */
46 #ifndef SWAP_BYTES_IN_WORD
47 #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
48 #endif /* SWAP_BYTES_IN_WORD */
49 
50 /** Split an u32_t in two u16_ts and add them up */
51 #ifndef FOLD_U32T
52 #define FOLD_U32T(u) ((u32_t)(((u) >> 16) + ((u) & 0x0000ffffUL)))
53 #endif
54 
55 #if LWIP_CHECKSUM_ON_COPY
56 /** Function-like macro: same as MEMCPY but returns the checksum of copied data
57  as u16_t */
58 # ifndef LWIP_CHKSUM_COPY
59 # define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
60 # ifndef LWIP_CHKSUM_COPY_ALGORITHM
61 # define LWIP_CHKSUM_COPY_ALGORITHM 1
62 # endif /* LWIP_CHKSUM_COPY_ALGORITHM */
63 # else /* LWIP_CHKSUM_COPY */
64 # define LWIP_CHKSUM_COPY_ALGORITHM 0
65 # endif /* LWIP_CHKSUM_COPY */
66 #else /* LWIP_CHECKSUM_ON_COPY */
67 # define LWIP_CHKSUM_COPY_ALGORITHM 0
68 #endif /* LWIP_CHECKSUM_ON_COPY */
69 
70 #ifdef __cplusplus
71 extern "C" {
72 #endif
73 
74 u16_t inet_chksum(const void *dataptr, u16_t len);
75 u16_t inet_chksum_pbuf(struct pbuf *p);
76 #if LWIP_CHKSUM_COPY_ALGORITHM
77 u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
78 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
79 
80 #if LWIP_IPV4
81 u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
82  const ip4_addr_t *src, const ip4_addr_t *dest);
83 u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto,
84  u16_t proto_len, u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest);
85 #endif /* LWIP_IPV4 */
86 
87 #if LWIP_IPV6
88 u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
89  const ip6_addr_t *src, const ip6_addr_t *dest);
90 u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
91  u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest);
92 #endif /* LWIP_IPV6 */
93 
94 
95 u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
96  const ip_addr_t *src, const ip_addr_t *dest);
97 u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
98  u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest);
99 
100 #ifdef __cplusplus
101 }
102 #endif
103 
104 #endif /* LWIP_HDR_INET_H */
105 
lwIP Options Configuration
Main packet buffer struct.
pbuf API
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:237
IP address API (common IPv4 and IPv6)
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.