mirror of https://gitee.com/openkylin/linux.git
37 lines
940 B
C
37 lines
940 B
C
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <net/checksum.h>
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#include <asm/byteorder.h>
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/*
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* copy from fs while checksumming, otherwise like csum_partial
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*/
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__wsum
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csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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__wsum sum, int *csum_err)
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{
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int missing;
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missing = __copy_from_user(dst, src, len);
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if (missing) {
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memset(dst + len - missing, 0, missing);
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*csum_err = -EFAULT;
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} else
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*csum_err = 0;
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return csum_partial(dst, len, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy_from_user);
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/* These are from csum_64plus.S */
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EXPORT_SYMBOL(csum_partial);
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EXPORT_SYMBOL(csum_partial_copy);
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EXPORT_SYMBOL(ip_compute_csum);
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EXPORT_SYMBOL(ip_fast_csum);
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