minix3/lib/liblwip/include/lwip/inet_chksum.h

113 lines
4.5 KiB
C

/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
#ifndef __LWIP_INET_CHKSUM_H__
#define __LWIP_INET_CHKSUM_H__
#include "lwip/opt.h"
#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"
/** Swap the bytes in an u16_t: much like htons() for little-endian */
#ifndef SWAP_BYTES_IN_WORD
#if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
/* little endian and PLATFORM_BYTESWAP defined */
#define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
#else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
/* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
#define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
#endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
#endif /* SWAP_BYTES_IN_WORD */
/** Split an u32_t in two u16_ts and add them up */
#ifndef FOLD_U32T
#define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
#endif
#if LWIP_CHECKSUM_ON_COPY
/** Function-like macro: same as MEMCPY but returns the checksum of copied data
as u16_t */
#ifndef LWIP_CHKSUM_COPY
#define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
#ifndef LWIP_CHKSUM_COPY_ALGORITHM
#define LWIP_CHKSUM_COPY_ALGORITHM 1
#endif /* LWIP_CHKSUM_COPY_ALGORITHM */
#endif /* LWIP_CHKSUM_COPY */
#else /* LWIP_CHECKSUM_ON_COPY */
#define LWIP_CHKSUM_COPY_ALGORITHM 0
#endif /* LWIP_CHECKSUM_ON_COPY */
#ifdef __cplusplus
extern "C" {
#endif
u16_t inet_chksum(void *dataptr, u16_t len);
u16_t inet_chksum_pbuf(struct pbuf *p);
u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
ip_addr_t *src, ip_addr_t *dest);
u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto,
u16_t proto_len, u16_t chksum_len, ip_addr_t *src, ip_addr_t *dest);
#if LWIP_CHKSUM_COPY_ALGORITHM
u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
#endif /* LWIP_CHKSUM_COPY_ALGORITHM */
#if LWIP_IPV6
u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
ip6_addr_t *src, ip6_addr_t *dest);
u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
u16_t chksum_len, ip6_addr_t *src, ip6_addr_t *dest);
#define ipX_chksum_pseudo(isipv6, p, proto, proto_len, src, dest) \
((isipv6) ? \
ip6_chksum_pseudo(p, proto, proto_len, ipX_2_ip6(src), ipX_2_ip6(dest)) :\
inet_chksum_pseudo(p, proto, proto_len, ipX_2_ip(src), ipX_2_ip(dest)))
#define ipX_chksum_pseudo_partial(isipv6, p, proto, proto_len, chksum_len, src, dest) \
((isipv6) ? \
ip6_chksum_pseudo_partial(p, proto, proto_len, chksum_len, ipX_2_ip6(src), ipX_2_ip6(dest)) :\
inet_chksum_pseudo_partial(p, proto, proto_len, chksum_len, ipX_2_ip(src), ipX_2_ip(dest)))
#else /* LWIP_IPV6 */
#define ipX_chksum_pseudo(isipv6, p, proto, proto_len, src, dest) \
inet_chksum_pseudo(p, proto, proto_len, src, dest)
#define ipX_chksum_pseudo_partial(isipv6, p, proto, proto_len, chksum_len, src, dest) \
inet_chksum_pseudo_partial(p, proto, proto_len, chksum_len, src, dest)
#endif /* LWIP_IPV6 */
#ifdef __cplusplus
}
#endif
#endif /* __LWIP_INET_H__ */