85d20dee20
* sanitize prototypes, annotate * ntohs -> shift in checksum calculations in l-e case * kill shift-by-16 in checksum calculations Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* M32R specific IP/TCP/UDP checksumming routines
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* (Some code taken from MIPS architecture)
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 1995 Waldorf Electronics GmbH
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* Copyright (C) 1998, 1999 Ralf Baechle
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* Copyright (C) 2001-2005 Hiroyuki Kondo, Hirokazu Takata
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <net/checksum.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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/*
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* Copy while checksumming, otherwise like csum_partial
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*/
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__wsum
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csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
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{
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sum = csum_partial(src, len, sum);
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memcpy(dst, src, len);
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return sum;
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}
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EXPORT_SYMBOL(csum_partial_copy_nocheck);
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/*
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* Copy from userspace and compute checksum. If we catch an exception
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* then zero the rest of the buffer.
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*/
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__wsum
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csum_partial_copy_from_user (const void __user *src, void *dst,
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int len, __wsum sum, int *err_ptr)
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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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*err_ptr = -EFAULT;
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}
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return csum_partial(dst, len-missing, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy_from_user);
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EXPORT_SYMBOL(csum_partial);
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