Marco Zecchini
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Example_RTOS
Rtos API example
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inet_chksum.h
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00001 /** 00002 * @file 00003 * IP checksum calculation functions 00004 */ 00005 00006 /* 00007 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00008 * All rights reserved. 00009 * 00010 * Redistribution and use in source and binary forms, with or without modification, 00011 * are permitted provided that the following conditions are met: 00012 * 00013 * 1. Redistributions of source code must retain the above copyright notice, 00014 * this list of conditions and the following disclaimer. 00015 * 2. Redistributions in binary form must reproduce the above copyright notice, 00016 * this list of conditions and the following disclaimer in the documentation 00017 * and/or other materials provided with the distribution. 00018 * 3. The name of the author may not be used to endorse or promote products 00019 * derived from this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00022 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00024 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00026 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00029 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 * 00032 * This file is part of the lwIP TCP/IP stack. 00033 * 00034 * Author: Adam Dunkels <adam@sics.se> 00035 * 00036 */ 00037 #ifndef LWIP_HDR_INET_CHKSUM_H 00038 #define LWIP_HDR_INET_CHKSUM_H 00039 00040 #include "lwip/opt.h" 00041 00042 #include "lwip/pbuf.h" 00043 #include "lwip/ip_addr.h" 00044 00045 /** Swap the bytes in an u16_t: much like lwip_htons() for little-endian */ 00046 #ifndef SWAP_BYTES_IN_WORD 00047 #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8) 00048 #endif /* SWAP_BYTES_IN_WORD */ 00049 00050 /** Split an u32_t in two u16_ts and add them up */ 00051 #ifndef FOLD_U32T 00052 #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL)) 00053 #endif 00054 00055 #if LWIP_CHECKSUM_ON_COPY 00056 /** Function-like macro: same as MEMCPY but returns the checksum of copied data 00057 as u16_t */ 00058 # ifndef LWIP_CHKSUM_COPY 00059 # define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len) 00060 # ifndef LWIP_CHKSUM_COPY_ALGORITHM 00061 # define LWIP_CHKSUM_COPY_ALGORITHM 1 00062 # endif /* LWIP_CHKSUM_COPY_ALGORITHM */ 00063 # else /* LWIP_CHKSUM_COPY */ 00064 # define LWIP_CHKSUM_COPY_ALGORITHM 0 00065 # endif /* LWIP_CHKSUM_COPY */ 00066 #else /* LWIP_CHECKSUM_ON_COPY */ 00067 # define LWIP_CHKSUM_COPY_ALGORITHM 0 00068 #endif /* LWIP_CHECKSUM_ON_COPY */ 00069 00070 #ifdef __cplusplus 00071 extern "C" { 00072 #endif 00073 00074 u16_t inet_chksum(const void *dataptr, u16_t len); 00075 u16_t inet_chksum_pbuf(struct pbuf *p); 00076 #if LWIP_CHKSUM_COPY_ALGORITHM 00077 u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len); 00078 #endif /* LWIP_CHKSUM_COPY_ALGORITHM */ 00079 00080 #if LWIP_IPV4 00081 u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, 00082 const ip4_addr_t *src, const ip4_addr_t *dest); 00083 u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto, 00084 u16_t proto_len, u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest); 00085 #endif /* LWIP_IPV4 */ 00086 00087 #if LWIP_IPV6 00088 u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, 00089 const ip6_addr_t *src, const ip6_addr_t *dest); 00090 u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, 00091 u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest); 00092 #endif /* LWIP_IPV6 */ 00093 00094 00095 u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, 00096 const ip_addr_t *src, const ip_addr_t *dest); 00097 u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, 00098 u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest); 00099 00100 #ifdef __cplusplus 00101 } 00102 #endif 00103 00104 #endif /* LWIP_HDR_INET_H */ 00105
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