[TCPIP]
[reactos.git] / reactos / lib / drivers / lwip / src / include / ipv4 / lwip / inet_chksum.h
1 /*
2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25 * OF SUCH DAMAGE.
26 *
27 * This file is part of the lwIP TCP/IP stack.
28 *
29 * Author: Adam Dunkels <adam@sics.se>
30 *
31 */
32 #ifndef __LWIP_INET_CHKSUM_H__
33 #define __LWIP_INET_CHKSUM_H__
34
35 #include "lwip/opt.h"
36
37 #include "lwip/pbuf.h"
38 #include "lwip/ip_addr.h"
39
40 /** Swap the bytes in an u16_t: much like htons() for little-endian */
41 #ifndef SWAP_BYTES_IN_WORD
42 #if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
43 /* little endian and PLATFORM_BYTESWAP defined */
44 #define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
45 #else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
46 /* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
47 #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
48 #endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
49 #endif /* SWAP_BYTES_IN_WORD */
50
51 /** Split an u32_t in two u16_ts and add them up */
52 #ifndef FOLD_U32T
53 #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
54 #endif
55
56 #if LWIP_CHECKSUM_ON_COPY
57 /** Function-like macro: same as MEMCPY but returns the checksum of copied data
58 as u16_t */
59 #ifndef LWIP_CHKSUM_COPY
60 #define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
61 #ifndef LWIP_CHKSUM_COPY_ALGORITHM
62 #define LWIP_CHKSUM_COPY_ALGORITHM 1
63 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
64 #endif /* LWIP_CHKSUM_COPY */
65 #else /* LWIP_CHECKSUM_ON_COPY */
66 #define LWIP_CHKSUM_COPY_ALGORITHM 0
67 #endif /* LWIP_CHECKSUM_ON_COPY */
68
69 #ifdef __cplusplus
70 extern "C" {
71 #endif
72
73 u16_t inet_chksum(void *dataptr, u16_t len);
74 u16_t inet_chksum_pbuf(struct pbuf *p);
75 u16_t inet_chksum_pseudo(struct pbuf *p,
76 ip_addr_t *src, ip_addr_t *dest,
77 u8_t proto, u16_t proto_len);
78 u16_t inet_chksum_pseudo_partial(struct pbuf *p,
79 ip_addr_t *src, ip_addr_t *dest,
80 u8_t proto, u16_t proto_len, u16_t chksum_len);
81 #if LWIP_CHKSUM_COPY_ALGORITHM
82 u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
83 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
84
85 #ifdef __cplusplus
86 }
87 #endif
88
89 #endif /* __LWIP_INET_H__ */
90