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/*
* 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
__wsum csum_and_copy_from_user (const void __user *src, void *dst,
int len, __wsum 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__ __wsum csum_and_copy_to_user
(const void *src, void __user *dst, int len, __wsum 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 (__force __wsum)-1; /* invalid checksum */
}
#endif
#ifndef HAVE_ARCH_CSUM_ADD
static inline __wsum csum_add(__wsum csum, __wsum addend)
{
u32 res = (__force u32)csum;
res += (__force u32)addend;
return (__force __wsum)(res + (res < (__force u32)addend));
}
#endif
static inline __wsum csum_sub(__wsum csum, __wsum addend)
{
return csum_add(csum, ~addend);
}
static inline __sum16 csum16_add(__sum16 csum, __be16 addend)
{
u16 res = (__force u16)csum;
res += (__force u16)addend;
return (__force __sum16)(res + (res < (__force u16)addend));
}
static inline __sum16 csum16_sub(__sum16 csum, __be16 addend)
{
return csum16_add(csum, ~addend);
}
static inline __wsum
csum_block_add(__wsum csum, __wsum csum2, int offset)
{
u32 sum = (__force u32)csum2;
if (offset&1)
sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
return csum_add(csum, (__force __wsum)sum);
}
static inline __wsum
csum_block_add_ext(__wsum csum, __wsum csum2, int offset, int len)
{
return csum_block_add(csum, csum2, offset);
}
static inline __wsum
csum_block_sub(__wsum csum, __wsum csum2, int offset)
{
u32 sum = (__force u32)csum2;
if (offset&1)
sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
return csum_sub(csum, (__force __wsum)sum);
}
static inline __wsum csum_unfold(__sum16 n)
{
return (__force __wsum)n;
}
static inline __wsum csum_partial_ext(const void *buff, int len, __wsum sum)
{
return csum_partial(buff, len, sum);
}
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
{
*sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), from), to));
}
/* Implements RFC 1624 (Incremental Internet Checksum)
* 3. Discussion states :
* HC' = ~(~HC + ~m + m')
* m : old value of a 16bit field
* m' : new value of a 16bit field
*/
static inline void csum_replace2(__sum16 *sum, __be16 old, __be16 new)
{
*sum = ~csum16_add(csum16_sub(~(*sum), old), new);
}
struct sk_buff;
void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, int pseudohdr);
void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
const __be32 *from, const __be32 *to,
int pseudohdr);
static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
__be16 from, __be16 to,
int pseudohdr)
{
inet_proto_csum_replace4(sum, skb, (__force __be32)from,
(__force __be32)to, pseudohdr);
}
static inline __wsum remcsum_adjust(void *ptr, __wsum csum,
int start, int offset)
{
__sum16 *psum = (__sum16 *)(ptr + offset);
__wsum delta;
/* Subtract out checksum up to start */
csum = csum_sub(csum, csum_partial(ptr, start, 0));
/* Set derived checksum in packet */
delta = csum_sub(csum_fold(csum), *psum);
*psum = csum_fold(csum);
return delta;
}
static inline void remcsum_unadjust(__sum16 *psum, __wsum delta)
{
*psum = csum_fold(csum_sub(delta, *psum));
}
#endif
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