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arch
ia64
include
asm
checksum.h
Go to the documentation of this file.
1
#ifndef _ASM_IA64_CHECKSUM_H
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#define _ASM_IA64_CHECKSUM_H
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/*
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* Modified 1998, 1999
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* David Mosberger-Tang <
[email protected]
>, Hewlett-Packard Co
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*/
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*/
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extern
__sum16
ip_fast_csum
(
const
void
*iph,
unsigned
int
ihl);
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/*
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* Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
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* checksum, already complemented
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*/
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extern
__sum16
csum_tcpudp_magic
(
__be32
saddr
,
__be32
daddr
,
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unsigned
short
len,
21
unsigned
short
proto
,
22
__wsum
sum
);
23
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extern
__wsum
csum_tcpudp_nofold
(
__be32
saddr
,
__be32
daddr
,
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unsigned
short
len,
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unsigned
short
proto
,
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__wsum
sum
);
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/*
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* Computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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extern
__wsum
csum_partial
(
const
void
*buff,
int
len,
__wsum
sum
);
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/*
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* Same as csum_partial, but copies from src while it checksums.
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*
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* Here it is even more important to align src and dst on a 32-bit (or
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* even better 64-bit) boundary.
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*/
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extern
__wsum
csum_partial_copy_from_user
(
const
void
__user *
src
,
void
*
dst
,
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int
len,
__wsum
sum
,
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int
*errp);
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extern
__wsum
csum_partial_copy_nocheck
(
const
void
*
src
,
void
*
dst
,
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int
len,
__wsum
sum
);
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/*
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* This routine is used for miscellaneous IP-like checksums, mainly in
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* icmp.c
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*/
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extern
__sum16
ip_compute_csum
(
const
void
*buff,
int
len);
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/*
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* Fold a partial checksum without adding pseudo headers.
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*/
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static
inline
__sum16
csum_fold(
__wsum
csum
)
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{
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u32
sum
= (
__force
u32
)csum;
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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return
(
__force
__sum16
)~sum;
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}
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#define _HAVE_ARCH_IPV6_CSUM 1
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struct
in6_addr
;
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extern
__sum16
csum_ipv6_magic
(
const
struct
in6_addr
*
saddr
,
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const
struct
in6_addr
*
daddr
,
__u32
len,
unsigned
short
proto
,
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__wsum
csum);
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#endif
/* _ASM_IA64_CHECKSUM_H */
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