mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Al Viro](/assets/img/avatar_default.png)
* sanitize prototypes, annotate * ntohs -> shift in checksum calculations in l-e case * kill shift-by-16 in checksum calculations Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
204 lines
4.9 KiB
C
204 lines
4.9 KiB
C
#ifdef __KERNEL__
|
|
#ifndef _ASM_M32R_CHECKSUM_H
|
|
#define _ASM_M32R_CHECKSUM_H
|
|
|
|
/*
|
|
* include/asm-m32r/checksum.h
|
|
*
|
|
* IP/TCP/UDP checksum routines
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Some code taken from mips and parisc architecture.
|
|
*
|
|
* Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata
|
|
* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
|
|
*/
|
|
|
|
#include <linux/in6.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
|
|
*/
|
|
asmlinkage __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
|
|
*/
|
|
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
|
|
int len, __wsum sum);
|
|
|
|
/*
|
|
* This is a new version of the above that records errors it finds in *errp,
|
|
* but continues and zeros thre rest of the buffer.
|
|
*/
|
|
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum sum,
|
|
int *err_ptr);
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned long tmpreg;
|
|
__asm__(
|
|
" sll3 %1, %0, #16 \n"
|
|
" cmp %0, %0 \n"
|
|
" addx %0, %1 \n"
|
|
" ldi %1, #0 \n"
|
|
" srli %0, #16 \n"
|
|
" addx %0, %1 \n"
|
|
" xor3 %0, %0, #0x0000ffff \n"
|
|
: "=r" (sum), "=&r" (tmpreg)
|
|
: "0" (sum)
|
|
: "cbit"
|
|
);
|
|
return (__force __sum16)sum;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
unsigned long tmpreg0, tmpreg1;
|
|
__wsum sum;
|
|
|
|
__asm__ __volatile__(
|
|
" ld %0, @%1+ \n"
|
|
" addi %2, #-4 \n"
|
|
"# bgez %2, 2f \n"
|
|
" cmp %0, %0 \n"
|
|
" ld %3, @%1+ \n"
|
|
" ld %4, @%1+ \n"
|
|
" addx %0, %3 \n"
|
|
" ld %3, @%1+ \n"
|
|
" addx %0, %4 \n"
|
|
" addx %0, %3 \n"
|
|
" .fillinsn\n"
|
|
"1: \n"
|
|
" ld %4, @%1+ \n"
|
|
" addi %2, #-1 \n"
|
|
" addx %0, %4 \n"
|
|
" bgtz %2, 1b \n"
|
|
"\n"
|
|
" ldi %3, #0 \n"
|
|
" addx %0, %3 \n"
|
|
" .fillinsn\n"
|
|
"2: \n"
|
|
/* Since the input registers which are loaded with iph and ihl
|
|
are modified, we must also specify them as outputs, or gcc
|
|
will assume they contain their original values. */
|
|
: "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
|
|
: "1" (iph), "2" (ihl)
|
|
: "cbit", "memory");
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
#if defined(__LITTLE_ENDIAN)
|
|
unsigned long len_proto = (proto + len) << 8;
|
|
#else
|
|
unsigned long len_proto = proto + len;
|
|
#endif
|
|
unsigned long tmpreg;
|
|
|
|
__asm__(
|
|
" cmp %0, %0 \n"
|
|
" addx %0, %2 \n"
|
|
" addx %0, %3 \n"
|
|
" addx %0, %4 \n"
|
|
" ldi %1, #0 \n"
|
|
" addx %0, %1 \n"
|
|
: "=r" (sum), "=&r" (tmpreg)
|
|
: "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
|
|
: "cbit"
|
|
);
|
|
|
|
return sum;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
unsigned short len,
|
|
unsigned short 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));
|
|
}
|
|
|
|
#define _HAVE_ARCH_IPV6_CSUM
|
|
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr,
|
|
__u32 len, unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
|
|
__asm__(
|
|
" ld %1, @(%5) \n"
|
|
" ld %2, @(4,%5) \n"
|
|
" ld %3, @(8,%5) \n"
|
|
" ld %4, @(12,%5) \n"
|
|
" add %0, %1 \n"
|
|
" addx %0, %2 \n"
|
|
" addx %0, %3 \n"
|
|
" addx %0, %4 \n"
|
|
" ld %1, @(%6) \n"
|
|
" ld %2, @(4,%6) \n"
|
|
" ld %3, @(8,%6) \n"
|
|
" ld %4, @(12,%6) \n"
|
|
" addx %0, %1 \n"
|
|
" addx %0, %2 \n"
|
|
" addx %0, %3 \n"
|
|
" addx %0, %4 \n"
|
|
" addx %0, %7 \n"
|
|
" addx %0, %8 \n"
|
|
" ldi %1, #0 \n"
|
|
" addx %0, %1 \n"
|
|
: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
|
|
"=&r" (tmpreg2), "=&r" (tmpreg3)
|
|
: "r" (saddr), "r" (daddr),
|
|
"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
|
|
: "cbit"
|
|
);
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
#endif /* _ASM_M32R_CHECKSUM_H */
|
|
#endif /* __KERNEL__ */
|