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 91