src/include/lwip/inet_chksum.h (LwIP)

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/** * @file * IP checksum calculation functions */ /* * 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_HDR_INET_CHKSUM_H #define LWIP_HDR_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 lwip_htons() for little-endian */ #ifndef SWAP_BYTES_IN_WORD #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8) #endif /* SWAP_BYTES_IN_WORD */ /** Split an u32_t in two u16_ts and add them up */ #ifndef FOLD_U32T #define FOLD_U32T(u) ((u32_t)(((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 */ # else /* LWIP_CHKSUM_COPY */ # define LWIP_CHKSUM_COPY_ALGORITHM 0 # 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(const void *dataptr, u16_t len); u16_t inet_chksum_pbuf(struct pbuf *p); #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_IPV4 u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, const ip4_addr_t *src, const ip4_addr_t *dest); u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest); #endif /* LWIP_IPV4 */ #if LWIP_IPV6 u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, const ip6_addr_t *src, const ip6_addr_t *dest); u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest); #endif /* LWIP_IPV6 */ u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, const ip_addr_t *src, const ip_addr_t *dest); u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest); #ifdef __cplusplus } #endif #endif /* LWIP_HDR_INET_H */