84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* TODO: csum_tcpudp_magic could be speeded up, and csum_fold as well */
|
|
|
|
#ifndef _CRIS_CHECKSUM_H
|
|
#define _CRIS_CHECKSUM_H
|
|
|
|
#include <arch/checksum.h>
|
|
|
|
/*
|
|
* computes the checksum of a memory block at buff, length len,
|
|
* and adds in "sum" (32-bit)
|
|
*
|
|
* returns a 32-bit number suitable for feeding into itself
|
|
* or csum_tcpudp_magic
|
|
*
|
|
* this function must be called with even lengths, except
|
|
* for the last fragment, which may be odd
|
|
*
|
|
* it's best to have buff aligned on a 32-bit boundary
|
|
*/
|
|
__wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
|
|
/*
|
|
* the same as csum_partial, but copies from src while it
|
|
* checksums
|
|
*
|
|
* here even more important to align src and dst on a 32-bit (or even
|
|
* better 64-bit) boundary
|
|
*/
|
|
|
|
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
|
|
int len, __wsum sum);
|
|
|
|
/*
|
|
* Fold a partial checksum into a word
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum csum)
|
|
{
|
|
u32 sum = (__force u32)csum;
|
|
sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
|
|
sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
|
|
return (__force __sum16)~sum;
|
|
}
|
|
|
|
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum sum,
|
|
int *errptr);
|
|
|
|
/*
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries.
|
|
*
|
|
*/
|
|
|
|
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
|
|
{
|
|
return csum_fold(csum_partial(iph, ihl * 4, 0));
|
|
}
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
|
|
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
|
|
__u32 len, __u8 proto,
|
|
__wsum sum)
|
|
{
|
|
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
|
|
}
|
|
|
|
/*
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
|
* in icmp.c
|
|
*/
|
|
|
|
static inline __sum16 ip_compute_csum(const void *buff, int len)
|
|
{
|
|
return csum_fold (csum_partial(buff, len, 0));
|
|
}
|
|
|
|
#endif
|