mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
|
#ifndef _ASM_IA64_CHECKSUM_H
|
||
|
|
#define _ASM_IA64_CHECKSUM_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Modified 1998, 1999
|
||
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
||
|
|
* which always checksum on 4 octet boundaries.
|
||
|
|
*/
|
||
|
|
extern unsigned short ip_fast_csum (unsigned char * iph, unsigned int ihl);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
|
||
|
|
* checksum, already complemented
|
||
|
|
*/
|
||
|
|
extern unsigned short int csum_tcpudp_magic (unsigned long saddr,
|
||
|
|
unsigned long daddr,
|
||
|
|
unsigned short len,
|
||
|
|
unsigned short proto,
|
||
|
|
unsigned int sum);
|
||
|
|
|
||
|
|
extern unsigned int csum_tcpudp_nofold (unsigned long saddr,
|
||
|
|
unsigned long daddr,
|
||
|
|
unsigned short len,
|
||
|
|
unsigned short proto,
|
||
|
|
unsigned int sum);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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
|
||
|
|
*/
|
||
|
|
extern unsigned int csum_partial (const unsigned char * buff, int len,
|
||
|
|
unsigned int sum);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Same as csum_partial, but copies from src while it checksums.
|
||
|
|
*
|
||
|
|
* Here it is even more important to align src and dst on a 32-bit (or
|
||
|
|
* even better 64-bit) boundary.
|
||
|
|
*/
|
||
|
|
extern unsigned int csum_partial_copy_from_user (const char *src, char *dst,
|
||
|
|
int len, unsigned int sum,
|
||
|
|
int *errp);
|
||
|
|
|
||
|
|
extern unsigned int csum_partial_copy_nocheck (const char *src, char *dst,
|
||
|
|
int len, unsigned int sum);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This routine is used for miscellaneous IP-like checksums, mainly in
|
||
|
|
* icmp.c
|
||
|
|
*/
|
||
|
|
extern unsigned short ip_compute_csum (unsigned char *buff, int len);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fold a partial checksum without adding pseudo headers.
|
||
|
|
*/
|
||
|
|
static inline unsigned short
|
||
|
|
csum_fold (unsigned int sum)
|
||
|
|
{
|
||
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
||
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
||
|
|
return ~sum;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* _ASM_IA64_CHECKSUM_H */
|