1 | /**
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2 | * @file
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3 | * IP checksum calculation functions
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4 | */
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5 |
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6 | /*
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7 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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8 | * All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without modification,
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11 | * are permitted provided that the following conditions are met:
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12 | *
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13 | * 1. Redistributions of source code must retain the above copyright notice,
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14 | * this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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16 | * this list of conditions and the following disclaimer in the documentation
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17 | * and/or other materials provided with the distribution.
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18 | * 3. The name of the author may not be used to endorse or promote products
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19 | * derived from this software without specific prior written permission.
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20 | *
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21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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30 | * OF SUCH DAMAGE.
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31 | *
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32 | * This file is part of the lwIP TCP/IP stack.
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33 | *
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34 | * Author: Adam Dunkels <adam@sics.se>
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35 | *
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36 | */
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37 | #ifndef LWIP_HDR_INET_CHKSUM_H
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38 | #define LWIP_HDR_INET_CHKSUM_H
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39 |
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40 | #include "lwip/opt.h"
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41 |
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42 | #include "lwip/pbuf.h"
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43 | #include "lwip/ip_addr.h"
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44 |
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45 | /** Swap the bytes in an u16_t: much like lwip_htons() for little-endian */
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46 | #ifndef SWAP_BYTES_IN_WORD
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47 | #define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
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48 | #endif /* SWAP_BYTES_IN_WORD */
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49 |
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50 | /** Split an u32_t in two u16_ts and add them up */
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51 | #ifndef FOLD_U32T
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52 | #define FOLD_U32T(u) ((u32_t)(((u) >> 16) + ((u) & 0x0000ffffUL)))
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53 | #endif
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54 |
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55 | #if LWIP_CHECKSUM_ON_COPY
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56 | /** Function-like macro: same as MEMCPY but returns the checksum of copied data
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57 | as u16_t */
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58 | # ifndef LWIP_CHKSUM_COPY
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59 | # define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
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60 | # ifndef LWIP_CHKSUM_COPY_ALGORITHM
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61 | # define LWIP_CHKSUM_COPY_ALGORITHM 1
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62 | # endif /* LWIP_CHKSUM_COPY_ALGORITHM */
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63 | # else /* LWIP_CHKSUM_COPY */
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64 | # define LWIP_CHKSUM_COPY_ALGORITHM 0
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65 | # endif /* LWIP_CHKSUM_COPY */
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66 | #else /* LWIP_CHECKSUM_ON_COPY */
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67 | # define LWIP_CHKSUM_COPY_ALGORITHM 0
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68 | #endif /* LWIP_CHECKSUM_ON_COPY */
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69 |
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70 | #ifdef __cplusplus
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71 | extern "C" {
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72 | #endif
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73 |
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74 | u16_t inet_chksum(const void *dataptr, u16_t len);
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75 | u16_t inet_chksum_pbuf(struct pbuf *p);
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76 | #if LWIP_CHKSUM_COPY_ALGORITHM
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77 | u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
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78 | #endif /* LWIP_CHKSUM_COPY_ALGORITHM */
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79 |
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80 | #if LWIP_IPV4
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81 | u16_t inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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82 | const ip4_addr_t *src, const ip4_addr_t *dest);
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83 | u16_t inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto,
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84 | u16_t proto_len, u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest);
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85 | #endif /* LWIP_IPV4 */
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86 |
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87 | #if LWIP_IPV6
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88 | u16_t ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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89 | const ip6_addr_t *src, const ip6_addr_t *dest);
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90 | u16_t ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
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91 | u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest);
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92 | #endif /* LWIP_IPV6 */
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93 |
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94 |
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95 | u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
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96 | const ip_addr_t *src, const ip_addr_t *dest);
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97 | u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
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98 | u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest);
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99 |
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100 | #ifdef __cplusplus
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101 | }
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102 | #endif
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103 |
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104 | #endif /* LWIP_HDR_INET_H */
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105 |
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