inet_chksum.h 3.5 KB

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  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. #include "lwip/opt.h"
  35. #include "lwip/pbuf.h"
  36. #include "lwip/ip_addr.h"
  37. /** Swap the bytes in an u16_t: much like htons() for little-endian */
  38. #ifndef SWAP_BYTES_IN_WORD
  39. #if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
  40. /* little endian and PLATFORM_BYTESWAP defined */
  41. #define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
  42. #else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
  43. /* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
  44. #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
  45. #endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
  46. #endif /* SWAP_BYTES_IN_WORD */
  47. /** Split an u32_t in two u16_ts and add them up */
  48. #ifndef FOLD_U32T
  49. #define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
  50. #endif
  51. #if LWIP_CHECKSUM_ON_COPY
  52. /** Function-like macro: same as MEMCPY but returns the checksum of copied data
  53. as u16_t */
  54. #ifndef LWIP_CHKSUM_COPY
  55. #define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
  56. #ifndef LWIP_CHKSUM_COPY_ALGORITHM
  57. #define LWIP_CHKSUM_COPY_ALGORITHM 1
  58. #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
  59. #endif /* LWIP_CHKSUM_COPY */
  60. #else /* LWIP_CHECKSUM_ON_COPY */
  61. #define LWIP_CHKSUM_COPY_ALGORITHM 0
  62. #endif /* LWIP_CHECKSUM_ON_COPY */
  63. #ifdef __cplusplus
  64. extern "C" {
  65. #endif
  66. u16_t inet_chksum(void *dataptr, u16_t len)ICACHE_FLASH_ATTR;
  67. u16_t inet_chksum_pbuf(struct pbuf *p)ICACHE_FLASH_ATTR;
  68. u16_t inet_chksum_pseudo(struct pbuf *p,
  69. ip_addr_t *src, ip_addr_t *dest,
  70. u8_t proto, u16_t proto_len)ICACHE_FLASH_ATTR;
  71. u16_t inet_chksum_pseudo_partial(struct pbuf *p,
  72. ip_addr_t *src, ip_addr_t *dest,
  73. u8_t proto, u16_t proto_len, u16_t chksum_len)ICACHE_FLASH_ATTR;
  74. #if LWIP_CHKSUM_COPY_ALGORITHM
  75. u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len)ICACHE_FLASH_ATTR;
  76. #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
  77. #ifdef __cplusplus
  78. }
  79. #endif
  80. #endif /* __LWIP_INET_H__ */