mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 03:33:59 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Checksumming functions for IP, TCP, UDP and so on
|
|
*
|
|
* Authors: Jorge Cwik, <jorge@laser.satlink.net>
|
|
* Arnt Gulbrandsen, <agulbra@nvg.unit.no>
|
|
* Borrows very liberally 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.
|
|
*/
|
|
|
|
#ifndef _CHECKSUM_H
|
|
#define _CHECKSUM_H
|
|
|
|
#include <linux/errno.h>
|
|
#include <asm/types.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/checksum.h>
|
|
|
|
#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
|
|
static inline
|
|
unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned char *dst,
|
|
int len, int sum, int *err_ptr)
|
|
{
|
|
if (access_ok(VERIFY_READ, src, len))
|
|
return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
|
|
|
|
if (len)
|
|
*err_ptr = -EFAULT;
|
|
|
|
return sum;
|
|
}
|
|
#endif
|
|
|
|
#ifndef HAVE_CSUM_COPY_USER
|
|
static __inline__ unsigned int csum_and_copy_to_user
|
|
(const unsigned char *src, unsigned char __user *dst, int len, unsigned int sum, int *err_ptr)
|
|
{
|
|
sum = csum_partial(src, len, sum);
|
|
|
|
if (access_ok(VERIFY_WRITE, dst, len)) {
|
|
if (copy_to_user(dst, src, len) == 0)
|
|
return sum;
|
|
}
|
|
if (len)
|
|
*err_ptr = -EFAULT;
|
|
|
|
return -1; /* invalid checksum */
|
|
}
|
|
#endif
|
|
|
|
static inline unsigned int csum_add(unsigned int csum, unsigned int addend)
|
|
{
|
|
csum += addend;
|
|
return csum + (csum < addend);
|
|
}
|
|
|
|
static inline unsigned int csum_sub(unsigned int csum, unsigned int addend)
|
|
{
|
|
return csum_add(csum, ~addend);
|
|
}
|
|
|
|
static inline unsigned int
|
|
csum_block_add(unsigned int csum, unsigned int csum2, int offset)
|
|
{
|
|
if (offset&1)
|
|
csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
|
|
return csum_add(csum, csum2);
|
|
}
|
|
|
|
static inline unsigned int
|
|
csum_block_sub(unsigned int csum, unsigned int csum2, int offset)
|
|
{
|
|
if (offset&1)
|
|
csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
|
|
return csum_sub(csum, csum2);
|
|
}
|
|
|
|
#endif
|