[457] | 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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