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106 lines
3.8 KiB
C
106 lines
3.8 KiB
C
/**
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* @file
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* IP checksum calculation functions
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#ifndef LWIP_HDR_INET_CHKSUM_H
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#define LWIP_HDR_INET_CHKSUM_H
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#include "lwip/opt.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip_addr.h"
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/** Swap the bytes in an u16_t: much like lwip_htons() for little-endian */
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#ifndef SWAP_BYTES_IN_WORD
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#define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
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#endif /* SWAP_BYTES_IN_WORD */
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/** Split an u32_t in two u16_ts and add them up */
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#ifndef FOLD_U32T
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#define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
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#endif
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#if LWIP_CHECKSUM_ON_COPY
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/** Function-like macro: same as MEMCPY but returns the checksum of copied data
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as u16_t */
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# ifndef LWIP_CHKSUM_COPY
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# define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
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# ifndef LWIP_CHKSUM_COPY_ALGORITHM
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# define LWIP_CHKSUM_COPY_ALGORITHM 1
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# endif /* LWIP_CHKSUM_COPY_ALGORITHM */
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# else /* LWIP_CHKSUM_COPY */
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# define LWIP_CHKSUM_COPY_ALGORITHM 0
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# endif /* LWIP_CHKSUM_COPY */
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#else /* LWIP_CHECKSUM_ON_COPY */
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# define LWIP_CHKSUM_COPY_ALGORITHM 0
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#endif /* LWIP_CHECKSUM_ON_COPY */
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#ifdef __cplusplus
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extern "C" {
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#endif
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u16_t inet_chksum(const void *dataptr, u16_t len);
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u16_t inet_chksum_pbuf(struct pbuf *p);
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#if LWIP_CHKSUM_COPY_ALGORITHM
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u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
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#endif /* LWIP_CHKSUM_COPY_ALGORITHM */
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#if LWIP_IPV4
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u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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const ip4_addr_t *src, const ip4_addr_t *dest);
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u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto,
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u16_t proto_len, u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest);
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#endif /* LWIP_IPV4 */
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#if LWIP_IPV6
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u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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const ip6_addr_t *src, const ip6_addr_t *dest);
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u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
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u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest);
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#endif /* LWIP_IPV6 */
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u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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const ip_addr_t *src, const ip_addr_t *dest);
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u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
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u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest);
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_HDR_INET_H */
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