59 lines
1.6 KiB
C
59 lines
1.6 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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* MIPS specific IP/TCP/UDP checksumming routines
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*
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* Authors: Ralf Baechle, <ralf@waldorf-gmbh.de>
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* Lots of code moved from tcp.c and ip.c; see those files
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* for more names.
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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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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <net/checksum.h>
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#include <asm/byteorder.h>
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#include <asm/string.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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unsigned int csum_partial_copy_nocheck (const char *src, char *dst,
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int len, unsigned int 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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unsigned int csum_partial_copy_from_user (const char __user *src, char *dst,
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int len, unsigned int sum,
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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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