/* * INET		An implementation of the TCP/IP protocol suite for the LINUX *		operating system.  INET is implemented using the  BSD Socket *		interface as the means of communication with the user level. * *		MIPS specific IP/TCP/UDP checksumming routines * * Authors:	Ralf Baechle, <ralf@waldorf-gmbh.de> *		Lots of code moved from tcp.c and ip.c; see those files *		for more names. * *		This program is free software; you can redistribute it and/or *		modify it under the terms of the GNU General Public License *		as published by the Free Software Foundation; either version *		2 of the License, or (at your option) any later version. */#include <net/checksum.h>#include <linux/types.h>#include <asm/byteorder.h>#include <asm/string.h>#include <asm/uaccess.h>/* * copy while checksumming, otherwise like csum_partial */unsigned int csum_partial_copy(const char *src, char *dst,                               int len, unsigned int sum){	/*	 * It's 2:30 am and I don't feel like doing it real ...	 * This is lots slower than the real thing (tm)	 */	sum = csum_partial(src, len, sum);	memcpy(dst, src, len);	return sum;}/* * Copy from userspace and compute checksum.  If we catch an exception * then zero the rest of the buffer. */unsigned int csum_partial_copy_from_user (const char *src, char *dst,                                          int len, unsigned int sum,                                          int *err_ptr){	int missing;	missing = copy_from_user(dst, src, len);	if (missing) {		memset(dst + len - missing, 0, missing);		*err_ptr = -EFAULT;	}	return csum_partial(dst, len, sum);}