a99a00cf1a
This allows to get rid of the CONFIG_NETFILTER dependency of NET_ACT_NAT. This patch redefines the old names to keep the noise low, the next patch converts all users. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
122 lines
3.1 KiB
C
122 lines
3.1 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
|
|
__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
|
|
|
|
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));
|
|
}
|
|
|
|
static inline __wsum csum_sub(__wsum csum, __wsum addend)
|
|
{
|
|
return csum_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_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;
|
|
}
|
|
|
|
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
|
|
|
|
static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
|
|
{
|
|
__be32 diff[] = { ~from, to };
|
|
|
|
*sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
|
|
}
|
|
|
|
static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to)
|
|
{
|
|
csum_replace4(sum, (__force __be32)from, (__force __be32)to);
|
|
}
|
|
|
|
struct sk_buff;
|
|
extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
|
|
__be32 from, __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);
|
|
}
|
|
|
|
#endif
|