checksum.h (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2) checksum.h (56649d5d3c4cb0fe6dd34808ca9f9208d84130ab)
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Checksumming functions for IP, TCP, UDP and so on
7 *
8 * Authors: Jorge Cwik, <jorge@laser.satlink.net>

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22#include <linux/errno.h>
23#include <asm/types.h>
24#include <asm/byteorder.h>
25#include <asm/uaccess.h>
26#include <asm/checksum.h>
27
28#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
29static inline
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Checksumming functions for IP, TCP, UDP and so on
7 *
8 * Authors: Jorge Cwik, <jorge@laser.satlink.net>

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22#include <linux/errno.h>
23#include <asm/types.h>
24#include <asm/byteorder.h>
25#include <asm/uaccess.h>
26#include <asm/checksum.h>
27
28#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
29static inline
30unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned char *dst,
31 int len, int sum, int *err_ptr)
30__wsum csum_and_copy_from_user (const void __user *src, void *dst,
31 int len, __wsum sum, int *err_ptr)
32{
33 if (access_ok(VERIFY_READ, src, len))
34 return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
35
36 if (len)
37 *err_ptr = -EFAULT;
38
39 return sum;
40}
41#endif
42
43#ifndef HAVE_CSUM_COPY_USER
32{
33 if (access_ok(VERIFY_READ, src, len))
34 return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
35
36 if (len)
37 *err_ptr = -EFAULT;
38
39 return sum;
40}
41#endif
42
43#ifndef HAVE_CSUM_COPY_USER
44static __inline__ unsigned int csum_and_copy_to_user
45(const unsigned char *src, unsigned char __user *dst, int len, unsigned int sum, int *err_ptr)
44static __inline__ __wsum csum_and_copy_to_user
45(const void *src, void __user *dst, int len, __wsum sum, int *err_ptr)
46{
47 sum = csum_partial(src, len, sum);
48
49 if (access_ok(VERIFY_WRITE, dst, len)) {
50 if (copy_to_user(dst, src, len) == 0)
51 return sum;
52 }
53 if (len)
54 *err_ptr = -EFAULT;
55
46{
47 sum = csum_partial(src, len, sum);
48
49 if (access_ok(VERIFY_WRITE, dst, len)) {
50 if (copy_to_user(dst, src, len) == 0)
51 return sum;
52 }
53 if (len)
54 *err_ptr = -EFAULT;
55
56 return -1; /* invalid checksum */
56 return (__force __wsum)-1; /* invalid checksum */
57}
58#endif
59
57}
58#endif
59
60static inline unsigned int csum_add(unsigned int csum, unsigned int addend)
60static inline __wsum csum_add(__wsum csum, __wsum addend)
61{
61{
62 csum += addend;
63 return csum + (csum < addend);
62 u32 res = (__force u32)csum;
63 res += (__force u32)addend;
64 return (__force __wsum)(res + (res < (__force u32)addend));
64}
65
65}
66
66static inline unsigned int csum_sub(unsigned int csum, unsigned int addend)
67static inline __wsum csum_sub(__wsum csum, __wsum addend)
67{
68 return csum_add(csum, ~addend);
69}
70
68{
69 return csum_add(csum, ~addend);
70}
71
71static inline unsigned int
72csum_block_add(unsigned int csum, unsigned int csum2, int offset)
72static inline __wsum
73csum_block_add(__wsum csum, __wsum csum2, int offset)
73{
74{
75 u32 sum = (__force u32)csum2;
74 if (offset&1)
76 if (offset&1)
75 csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
76 return csum_add(csum, csum2);
77 sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
78 return csum_add(csum, (__force __wsum)sum);
77}
78
79}
80
79static inline unsigned int
80csum_block_sub(unsigned int csum, unsigned int csum2, int offset)
81static inline __wsum
82csum_block_sub(__wsum csum, __wsum csum2, int offset)
81{
83{
84 u32 sum = (__force u32)csum2;
82 if (offset&1)
85 if (offset&1)
83 csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
84 return csum_sub(csum, csum2);
86 sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
87 return csum_sub(csum, (__force __wsum)sum);
85}
86
88}
89
90static inline __wsum csum_unfold(__sum16 n)
91{
92 return (__force __wsum)n;
93}
94
87#endif
95#endif