BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file |
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3 | * IP checksum calculation functions |
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4 | */ |
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5 | |||
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 | |||
40 | #include "lwip/opt.h" |
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41 | |||
42 | #include "lwip/pbuf.h" |
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43 | #include "lwip/ip_addr.h" |
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44 | |||
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 | |||
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 | |||
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 | |||
70 | #ifdef __cplusplus |
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71 | extern "C" { |
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72 | #endif |
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73 | |||
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 | |||
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 | |||
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 | |||
94 | |||
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 | |||
100 | #ifdef __cplusplus |
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101 | } |
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102 | #endif |
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103 | |||
104 | #endif /* LWIP_HDR_INET_H */ |
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105 |