106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
#ifndef _H8300_CHECKSUM_H
|
|
#define _H8300_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
|
|
*/
|
|
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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
|
|
*/
|
|
|
|
unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
|
|
|
|
|
|
/*
|
|
* the same as csum_partial_copy, but copies from user space.
|
|
*
|
|
* here 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, int sum, int *csum_err);
|
|
|
|
#define csum_partial_copy_nocheck(src, dst, len, sum) \
|
|
csum_partial_copy((src), (dst), (len), (sum))
|
|
|
|
unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
|
|
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
|
|
static inline unsigned int csum_fold(unsigned int sum)
|
|
{
|
|
__asm__("mov.l %0,er0\n\t"
|
|
"add.w e0,r0\n\t"
|
|
"xor.w e0,e0\n\t"
|
|
"rotxl.w e0\n\t"
|
|
"add.w e0,r0\n\t"
|
|
"sub.w e0,e0\n\t"
|
|
"mov.l er0,%0"
|
|
: "=r"(sum)
|
|
: "0"(sum)
|
|
: "er0");
|
|
return ~sum;
|
|
}
|
|
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
|
|
static inline unsigned int
|
|
csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
|
|
unsigned short proto, unsigned int sum)
|
|
{
|
|
__asm__ ("sub.l er0,er0\n\t"
|
|
"add.l %2,%0\n\t"
|
|
"addx #0,r0l\n\t"
|
|
"add.l %3,%0\n\t"
|
|
"addx #0,r0l\n\t"
|
|
"add.l %4,%0\n\t"
|
|
"addx #0,r0l\n\t"
|
|
"add.l er0,%0\n\t"
|
|
"bcc 1f\n\t"
|
|
"inc.l #1,%0\n"
|
|
"1:"
|
|
: "=&r" (sum)
|
|
: "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
|
|
:"er0");
|
|
return sum;
|
|
}
|
|
|
|
static inline unsigned short int
|
|
csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
|
|
unsigned short proto, unsigned int 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
|
|
*/
|
|
|
|
extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
|
|
|
|
#endif /* _H8300_CHECKSUM_H */
|