| 1 |
1276 |
phoenix |
#ifdef __KERNEL__
|
| 2 |
|
|
#ifndef _PPC_CHECKSUM_H
|
| 3 |
|
|
#define _PPC_CHECKSUM_H
|
| 4 |
|
|
|
| 5 |
|
|
|
| 6 |
|
|
/*
|
| 7 |
|
|
* computes the checksum of a memory block at buff, length len,
|
| 8 |
|
|
* and adds in "sum" (32-bit)
|
| 9 |
|
|
*
|
| 10 |
|
|
* returns a 32-bit number suitable for feeding into itself
|
| 11 |
|
|
* or csum_tcpudp_magic
|
| 12 |
|
|
*
|
| 13 |
|
|
* this function must be called with even lengths, except
|
| 14 |
|
|
* for the last fragment, which may be odd
|
| 15 |
|
|
*
|
| 16 |
|
|
* it's best to have buff aligned on a 32-bit boundary
|
| 17 |
|
|
*/
|
| 18 |
|
|
extern unsigned int csum_partial(const unsigned char * buff, int len,
|
| 19 |
|
|
unsigned int sum);
|
| 20 |
|
|
|
| 21 |
|
|
/*
|
| 22 |
|
|
* Computes the checksum of a memory block at src, length len,
|
| 23 |
|
|
* and adds in "sum" (32-bit), while copying the block to dst.
|
| 24 |
|
|
* If an access exception occurs on src or dst, it stores -EFAULT
|
| 25 |
|
|
* to *src_err or *dst_err respectively (if that pointer is not
|
| 26 |
|
|
* NULL), and, for an error on src, zeroes the rest of dst.
|
| 27 |
|
|
*
|
| 28 |
|
|
* Like csum_partial, this must be called with even lengths,
|
| 29 |
|
|
* except for the last fragment.
|
| 30 |
|
|
*/
|
| 31 |
|
|
extern unsigned int csum_partial_copy_generic(const char *src, char *dst,
|
| 32 |
|
|
int len, unsigned int sum,
|
| 33 |
|
|
int *src_err, int *dst_err);
|
| 34 |
|
|
|
| 35 |
|
|
#define csum_partial_copy_from_user(src, dst, len, sum, errp) \
|
| 36 |
|
|
csum_partial_copy_generic((src), (dst), (len), (sum), (errp), 0)
|
| 37 |
|
|
|
| 38 |
|
|
/* FIXME: this needs to be written to really do no check -- Cort */
|
| 39 |
|
|
#define csum_partial_copy_nocheck(src, dst, len, sum) \
|
| 40 |
|
|
csum_partial_copy_generic((src), (dst), (len), (sum), 0, 0)
|
| 41 |
|
|
/*
|
| 42 |
|
|
* Old versions which ignore errors.
|
| 43 |
|
|
*/
|
| 44 |
|
|
#define csum_partial_copy(src, dst, len, sum) \
|
| 45 |
|
|
csum_partial_copy_generic((src), (dst), (len), (sum), 0, 0)
|
| 46 |
|
|
#define csum_partial_copy_fromuser(src, dst, len, sum) \
|
| 47 |
|
|
csum_partial_copy_generic((src), (dst), (len), (sum), 0, 0)
|
| 48 |
|
|
|
| 49 |
|
|
|
| 50 |
|
|
/*
|
| 51 |
|
|
* turns a 32-bit partial checksum (e.g. from csum_partial) into a
|
| 52 |
|
|
* 1's complement 16-bit checksum.
|
| 53 |
|
|
*/
|
| 54 |
|
|
static inline unsigned int csum_fold(unsigned int sum)
|
| 55 |
|
|
{
|
| 56 |
|
|
unsigned int tmp;
|
| 57 |
|
|
|
| 58 |
|
|
/* swap the two 16-bit halves of sum */
|
| 59 |
|
|
__asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
|
| 60 |
|
|
/* if there is a carry from adding the two 16-bit halves,
|
| 61 |
|
|
it will carry from the lower half into the upper half,
|
| 62 |
|
|
giving us the correct sum in the upper half. */
|
| 63 |
|
|
sum = ~(sum + tmp) >> 16;
|
| 64 |
|
|
return sum;
|
| 65 |
|
|
}
|
| 66 |
|
|
|
| 67 |
|
|
/*
|
| 68 |
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
| 69 |
|
|
* in icmp.c
|
| 70 |
|
|
*/
|
| 71 |
|
|
static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
|
| 72 |
|
|
{
|
| 73 |
|
|
return csum_fold(csum_partial(buff, len, 0));
|
| 74 |
|
|
}
|
| 75 |
|
|
|
| 76 |
|
|
/*
|
| 77 |
|
|
* FIXME: I swiped this one from the sparc and made minor modifications.
|
| 78 |
|
|
* It may not be correct. -- Cort
|
| 79 |
|
|
*/
|
| 80 |
|
|
static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
|
| 81 |
|
|
unsigned long daddr,
|
| 82 |
|
|
unsigned short len,
|
| 83 |
|
|
unsigned short proto,
|
| 84 |
|
|
unsigned int sum)
|
| 85 |
|
|
{
|
| 86 |
|
|
__asm__("\n\
|
| 87 |
|
|
addc %0,%0,%1 \n\
|
| 88 |
|
|
adde %0,%0,%2 \n\
|
| 89 |
|
|
adde %0,%0,%3 \n\
|
| 90 |
|
|
addze %0,%0 \n\
|
| 91 |
|
|
"
|
| 92 |
|
|
: "=r" (sum)
|
| 93 |
|
|
: "r" (daddr), "r"(saddr), "r"((proto<<16)+len), "0"(sum));
|
| 94 |
|
|
return sum;
|
| 95 |
|
|
}
|
| 96 |
|
|
|
| 97 |
|
|
/*
|
| 98 |
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
| 99 |
|
|
* which always checksum on 4 octet boundaries. ihl is the number
|
| 100 |
|
|
* of 32-bit words and is always >= 5.
|
| 101 |
|
|
*/
|
| 102 |
|
|
extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
|
| 103 |
|
|
|
| 104 |
|
|
/*
|
| 105 |
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
| 106 |
|
|
* returns a 16-bit checksum, already complemented
|
| 107 |
|
|
*/
|
| 108 |
|
|
extern unsigned short csum_tcpudp_magic(unsigned long saddr,
|
| 109 |
|
|
unsigned long daddr,
|
| 110 |
|
|
unsigned short len,
|
| 111 |
|
|
unsigned short proto,
|
| 112 |
|
|
unsigned int sum);
|
| 113 |
|
|
|
| 114 |
|
|
#endif
|
| 115 |
|
|
#endif /* __KERNEL__ */
|
