forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
174 lines
4.6 KiB
C
174 lines
4.6 KiB
C
/* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */
|
|
#ifndef __SPARC64_CHECKSUM_H
|
|
#define __SPARC64_CHECKSUM_H
|
|
|
|
/* checksum.h: IP/UDP/TCP checksum routines on the V9.
|
|
*
|
|
* Copyright(C) 1995 Linus Torvalds
|
|
* Copyright(C) 1995 Miguel de Icaza
|
|
* Copyright(C) 1996 David S. Miller
|
|
* Copyright(C) 1996 Eddie C. Dost
|
|
* Copyright(C) 1997 Jakub Jelinek
|
|
*
|
|
* derived from:
|
|
* Alpha checksum c-code
|
|
* ix86 inline assembly
|
|
* RFC1071 Computing the Internet Checksum
|
|
*/
|
|
|
|
#include <linux/in6.h>
|
|
#include <asm/uaccess.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
|
|
*/
|
|
extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
|
|
|
|
/* the same as csum_partial, but copies from user space while it
|
|
* checksums
|
|
*
|
|
* 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_nocheck(const unsigned char *src,
|
|
unsigned char *dst,
|
|
int len, unsigned int sum);
|
|
|
|
extern long __csum_partial_copy_from_user(const unsigned char __user *src,
|
|
unsigned char *dst, int len,
|
|
unsigned int sum);
|
|
|
|
static inline unsigned int
|
|
csum_partial_copy_from_user(const unsigned char __user *src,
|
|
unsigned char *dst, int len,
|
|
unsigned int sum, int *err)
|
|
{
|
|
long ret = __csum_partial_copy_from_user(src, dst, len, sum);
|
|
if (ret < 0)
|
|
*err = -EFAULT;
|
|
return (unsigned int) ret;
|
|
}
|
|
|
|
/*
|
|
* Copy and checksum to user
|
|
*/
|
|
#define HAVE_CSUM_COPY_USER
|
|
extern long __csum_partial_copy_to_user(const unsigned char *src,
|
|
unsigned char __user *dst, int len,
|
|
unsigned int sum);
|
|
|
|
static inline unsigned int
|
|
csum_and_copy_to_user(const unsigned char *src,
|
|
unsigned char __user *dst, int len,
|
|
unsigned int sum, int *err)
|
|
{
|
|
long ret = __csum_partial_copy_to_user(src, dst, len, sum);
|
|
if (ret < 0)
|
|
*err = -EFAULT;
|
|
return (unsigned int) ret;
|
|
}
|
|
|
|
/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
|
|
* the majority of the time.
|
|
*/
|
|
extern unsigned short ip_fast_csum(__const__ unsigned char *iph,
|
|
unsigned int ihl);
|
|
|
|
/* Fold a partial checksum without adding pseudo headers. */
|
|
static inline unsigned short csum_fold(unsigned int sum)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
__asm__ __volatile__(
|
|
" addcc %0, %1, %1\n"
|
|
" srl %1, 16, %1\n"
|
|
" addc %1, %%g0, %1\n"
|
|
" xnor %%g0, %1, %0\n"
|
|
: "=&r" (sum), "=r" (tmp)
|
|
: "0" (sum), "1" (sum<<16)
|
|
: "cc");
|
|
return (sum & 0xffff);
|
|
}
|
|
|
|
static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
|
|
unsigned long daddr,
|
|
unsigned int len,
|
|
unsigned short proto,
|
|
unsigned int sum)
|
|
{
|
|
__asm__ __volatile__(
|
|
" addcc %1, %0, %0\n"
|
|
" addccc %2, %0, %0\n"
|
|
" addccc %3, %0, %0\n"
|
|
" addc %0, %%g0, %0\n"
|
|
: "=r" (sum), "=r" (saddr)
|
|
: "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr)
|
|
: "cc");
|
|
return sum;
|
|
}
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
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));
|
|
}
|
|
|
|
#define _HAVE_ARCH_IPV6_CSUM
|
|
|
|
static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
|
|
struct in6_addr *daddr,
|
|
__u32 len,
|
|
unsigned short proto,
|
|
unsigned int sum)
|
|
{
|
|
__asm__ __volatile__ (
|
|
" addcc %3, %4, %%g7\n"
|
|
" addccc %5, %%g7, %%g7\n"
|
|
" lduw [%2 + 0x0c], %%g2\n"
|
|
" lduw [%2 + 0x08], %%g3\n"
|
|
" addccc %%g2, %%g7, %%g7\n"
|
|
" lduw [%2 + 0x04], %%g2\n"
|
|
" addccc %%g3, %%g7, %%g7\n"
|
|
" lduw [%2 + 0x00], %%g3\n"
|
|
" addccc %%g2, %%g7, %%g7\n"
|
|
" lduw [%1 + 0x0c], %%g2\n"
|
|
" addccc %%g3, %%g7, %%g7\n"
|
|
" lduw [%1 + 0x08], %%g3\n"
|
|
" addccc %%g2, %%g7, %%g7\n"
|
|
" lduw [%1 + 0x04], %%g2\n"
|
|
" addccc %%g3, %%g7, %%g7\n"
|
|
" lduw [%1 + 0x00], %%g3\n"
|
|
" addccc %%g2, %%g7, %%g7\n"
|
|
" addccc %%g3, %%g7, %0\n"
|
|
" addc 0, %0, %0\n"
|
|
: "=&r" (sum)
|
|
: "r" (saddr), "r" (daddr), "r"(htonl(len)),
|
|
"r"(htonl(proto)), "r"(sum)
|
|
: "g2", "g3", "g7", "cc");
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
|
|
static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
|
|
{
|
|
return csum_fold(csum_partial(buff, len, 0));
|
|
}
|
|
|
|
#endif /* !(__SPARC64_CHECKSUM_H) */
|