236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
#ifndef _ASM_SCORE_CHECKSUM_H
|
|
#define _ASM_SCORE_CHECKSUM_H
|
|
|
|
#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
|
|
*/
|
|
unsigned int csum_partial(const void *buff, int len, __wsum sum);
|
|
unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len,
|
|
unsigned int sum, int *csum_err);
|
|
unsigned int csum_partial_copy(const char *src, char *dst,
|
|
int len, unsigned int sum);
|
|
|
|
/*
|
|
* this is a new version of the above that records errors it finds in *errp,
|
|
* but continues and zeros the rest of the buffer.
|
|
*/
|
|
|
|
/*
|
|
* Copy and checksum to user
|
|
*/
|
|
#define HAVE_CSUM_COPY_USER
|
|
static inline
|
|
__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
|
|
__wsum sum, int *err_ptr)
|
|
{
|
|
sum = csum_partial(src, len, sum);
|
|
if (copy_to_user(dst, src, len)) {
|
|
*err_ptr = -EFAULT;
|
|
return (__force __wsum) -1; /* invalid checksum */
|
|
}
|
|
return sum;
|
|
}
|
|
|
|
|
|
#define csum_partial_copy_nocheck csum_partial_copy
|
|
/*
|
|
* Fold a partial checksum without adding pseudo headers
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
/* the while loop is unnecessary really, it's always enough with two
|
|
iterations */
|
|
__asm__ __volatile__(
|
|
".set volatile\n\t"
|
|
".set\tr1\n\t"
|
|
"slli\tr1,%0, 16\n\t"
|
|
"add\t%0,%0, r1\n\t"
|
|
"cmp.c\tr1, %0\n\t"
|
|
"srli\t%0, %0, 16\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:ldi\tr30, 0xffff\n\t"
|
|
"xor\t%0, %0, r30\n\t"
|
|
"slli\t%0, %0, 16\n\t"
|
|
"srli\t%0, %0, 16\n\t"
|
|
".set\tnor1\n\t"
|
|
".set optimize\n\t"
|
|
: "=r" (sum)
|
|
: "0" (sum));
|
|
return sum;
|
|
}
|
|
|
|
/*
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries.
|
|
*
|
|
* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
|
|
* Arnt Gulbrandsen.
|
|
*/
|
|
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
|
|
{
|
|
unsigned int sum;
|
|
unsigned long dummy;
|
|
|
|
__asm__ __volatile__(
|
|
".set volatile\n\t"
|
|
".set\tnor1\n\t"
|
|
"lw\t%0, [%1]\n\t"
|
|
"subri\t%2, %2, 4\n\t"
|
|
"slli\t%2, %2, 2\n\t"
|
|
"lw\t%3, [%1, 4]\n\t"
|
|
"add\t%2, %2, %1\n\t"
|
|
"add\t%0, %0, %3\n\t"
|
|
"cmp.c\t%3, %0\n\t"
|
|
"lw\t%3, [%1, 8]\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:\n\t"
|
|
"add\t%0, %0, %3\n\t"
|
|
"cmp.c\t%3, %0\n\t"
|
|
"lw\t%3, [%1, 12]\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:add\t%0, %0, %3\n\t"
|
|
"cmp.c\t%3, %0\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n"
|
|
|
|
"1:\tlw\t%3, [%1, 16]\n\t"
|
|
"addi\t%1, 4\n\t"
|
|
"add\t%0, %0, %3\n\t"
|
|
"cmp.c\t%3, %0\n\t"
|
|
"bleu\t2f\n\t"
|
|
"addi\t%0, 0x1\n"
|
|
"2:cmp.c\t%2, %1\n\t"
|
|
"bne\t1b\n\t"
|
|
|
|
".set\tr1\n\t"
|
|
".set optimize\n\t"
|
|
: "=&r" (sum), "=&r" (iph), "=&r" (ihl), "=&r" (dummy)
|
|
: "1" (iph), "2" (ihl));
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
static inline __wsum
|
|
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
|
|
unsigned short proto, __wsum sum)
|
|
{
|
|
unsigned long tmp = (ntohs(len) << 16) + proto * 256;
|
|
__asm__ __volatile__(
|
|
".set volatile\n\t"
|
|
"add\t%0, %0, %2\n\t"
|
|
"cmp.c\t%2, %0\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:\n\t"
|
|
"add\t%0, %0, %3\n\t"
|
|
"cmp.c\t%3, %0\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:\n\t"
|
|
"add\t%0, %0, %4\n\t"
|
|
"cmp.c\t%4, %0\n\t"
|
|
"bleu\t1f\n\t"
|
|
"addi\t%0, 0x1\n\t"
|
|
"1:\n\t"
|
|
".set optimize\n\t"
|
|
: "=r" (sum)
|
|
: "0" (daddr), "r"(saddr),
|
|
"r" (tmp),
|
|
"r" (sum));
|
|
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 unsigned short 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)
|
|
{
|
|
__asm__ __volatile__(
|
|
".set\tnoreorder\t\t\t# csum_ipv6_magic\n\t"
|
|
".set\tnoat\n\t"
|
|
"addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"
|
|
"sltu\t$1, %0, %5\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %6\t\t\t# csum\n\t"
|
|
"sltu\t$1, %0, %6\n\t"
|
|
"lw\t%1, 0(%2)\t\t\t# four words source address\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 4(%2)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 8(%2)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 12(%2)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 0(%3)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 4(%3)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 8(%3)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"lw\t%1, 12(%3)\n\t"
|
|
"addu\t%0, $1\n\t"
|
|
"addu\t%0, %1\n\t"
|
|
"sltu\t$1, %0, %1\n\t"
|
|
"addu\t%0, $1\t\t\t# Add final carry\n\t"
|
|
".set\tnoat\n\t"
|
|
".set\tnoreorder"
|
|
: "=r" (sum), "=r" (proto)
|
|
: "r" (saddr), "r" (daddr),
|
|
"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
#endif /* _ASM_SCORE_CHECKSUM_H */
|