aboutsummaryrefslogtreecommitdiff
path: root/include/asm-sh/checksum.h
blob: 08168afe6746a3d43a6e93da269566dad4c8bcc3 (plain)
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
#ifndef __ASM_SH_CHECKSUM_H
#define __ASM_SH_CHECKSUM_H

/*
 * 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.
 *
 * Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
 */

#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 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);

/*
 * the same as csum_partial, but copies from src while it
 * checksums, and handles user-space pointer exceptions correctly, when needed.
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */

asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsigned char *dst,
						  int len, int sum, int *src_err_ptr, int *dst_err_ptr);

/*
 *	Note: when you get a NULL pointer exception here this means someone
 *	passed in an incorrect kernel address to one of these functions. 
 *	
 *	If you use these functions directly please don't forget the 
 *	access_ok().
 */
static __inline__
unsigned int csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
					int len, int sum)
{
	return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
}

static __inline__
unsigned int csum_partial_copy_from_user (const unsigned char *src, unsigned char *dst,
						int len, int sum, int *err_ptr)
{
	return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL);
}

/*
 *	Fold a partial checksum
 */

static __inline__ unsigned int csum_fold(unsigned int sum)
{
	unsigned int __dummy;
	__asm__("swap.w %0, %1\n\t"
		"extu.w	%0, %0\n\t"
		"extu.w	%1, %1\n\t"
		"add	%1, %0\n\t"
		"swap.w	%0, %1\n\t"
		"add	%1, %0\n\t"
		"not	%0, %0\n\t"
		: "=r" (sum), "=&r" (__dummy)
		: "0" (sum)
		: "t");
	return sum;
}

/*
 *	This is a version of ip_compute_csum() optimized for IP headers,
 *	which always checksum on 4 octet boundaries.
 *
 *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
 *      for linux by * Arnt Gulbrandsen.
 */
static __inline__ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
{
	unsigned int sum, __dummy0, __dummy1;

	__asm__ __volatile__(
		"mov.l	@%1+, %0\n\t"
		"mov.l	@%1+, %3\n\t"
		"add	#-2, %2\n\t"
		"clrt\n\t"
		"1:\t"
		"addc	%3, %0\n\t"
		"movt	%4\n\t"
		"mov.l	@%1+, %3\n\t"
		"dt	%2\n\t"
		"bf/s	1b\n\t"
		" cmp/eq #1, %4\n\t"
		"addc	%3, %0\n\t"
		"addc	%2, %0"	    /* Here %2 is 0, add carry-bit */
	/* 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" (__dummy0), "=&z" (__dummy1)
	: "1" (iph), "2" (ihl)
	: "t");

	return	csum_fold(sum);
}

static __inline__ unsigned long csum_tcpudp_nofold(unsigned long saddr,
						   unsigned long daddr,
						   unsigned short len,
						   unsigned short proto,
						   unsigned int sum) 
{
#ifdef __LITTLE_ENDIAN__
	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
#else
	unsigned long len_proto = (proto<<16)+len;
#endif
	__asm__("clrt\n\t"
		"addc	%0, %1\n\t"
		"addc	%2, %1\n\t"
		"addc	%3, %1\n\t"
		"movt	%0\n\t"
		"add	%1, %0"
		: "=r" (sum), "=r" (len_proto)
		: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)
		: "t");
	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));
}

/*
 * 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));
}

#define _HAVE_ARCH_IPV6_CSUM
#ifdef CONFIG_IPV6
static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
						     struct in6_addr *daddr,
						     __u32 len,
						     unsigned short proto,
						     unsigned int sum) 
{
	unsigned int __dummy;
	__asm__("clrt\n\t"
		"mov.l	@(0,%2), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(4,%2), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(8,%2), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(12,%2), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(0,%3), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(4,%3), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(8,%3), %1\n\t"
		"addc	%1, %0\n\t"
		"mov.l	@(12,%3), %1\n\t"
		"addc	%1, %0\n\t"
		"addc	%4, %0\n\t"
		"addc	%5, %0\n\t"
		"movt	%1\n\t"
		"add	%1, %0\n"
		: "=r" (sum), "=&r" (__dummy)
		: "r" (saddr), "r" (daddr), 
		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
		: "t");

	return csum_fold(sum);
}
#endif

/* 
 *	Copy and checksum to user
 */
#define HAVE_CSUM_COPY_USER
static __inline__ unsigned int csum_and_copy_to_user (const unsigned char *src,
						      unsigned char __user *dst,
						      int len, int sum,
						      int *err_ptr)
{
	if (access_ok(VERIFY_WRITE, dst, len))
		return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr);

	if (len)
		*err_ptr = -EFAULT;

	return -1; /* invalid checksum */
}
#endif /* __ASM_SH_CHECKSUM_H */