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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 | #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 */
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