Release 4.14 arch/x86/include/asm/checksum_32.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_CHECKSUM_32_H
#define _ASM_X86_CHECKSUM_32_H
#include <linux/in6.h>
#include <linux/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
*/
asmlinkage __wsum csum_partial(const void *buff, int len, __wsum 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 __wsum csum_partial_copy_generic(const void *src, void *dst,
int len, __wsum 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 __wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum)
{
return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 32 | 84.21% | 4 | 66.67% |
| Al Viro | 4 | 10.53% | 1 | 16.67% |
| Joe Perches | 2 | 5.26% | 1 | 16.67% |
| Total | 38 | 100.00% | 6 | 100.00% |
static inline __wsum csum_partial_copy_from_user(const void __user *src,
void *dst,
int len, __wsum sum,
int *err_ptr)
{
__wsum ret;
might_sleep();
stac();
ret = csum_partial_copy_generic((__force void *)src, dst,
len, sum, err_ptr, NULL);
clac();
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 35 | 54.69% | 4 | 44.44% |
| H. Peter Anvin | 14 | 21.88% | 1 | 11.11% |
| Al Viro | 10 | 15.62% | 2 | 22.22% |
| Ingo Molnar | 3 | 4.69% | 1 | 11.11% |
| Joe Perches | 2 | 3.12% | 1 | 11.11% |
| Total | 64 | 100.00% | 9 | 100.00% |
/*
* 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;
asm volatile("movl (%1), %0 ;\n"
"subl $4, %2 ;\n"
"jbe 2f ;\n"
"addl 4(%1), %0 ;\n"
"adcl 8(%1), %0 ;\n"
"adcl 12(%1), %0;\n"
"1: adcl 16(%1), %0 ;\n"
"lea 4(%1), %1 ;\n"
"decl %2 ;\n"
"jne 1b ;\n"
"adcl $0, %0 ;\n"
"movl %0, %2 ;\n"
"shrl $16, %0 ;\n"
"addw %w2, %w0 ;\n"
"adcl $0, %0 ;\n"
"notl %0 ;\n"
"2: ;\n"
/* 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)
: "1" (iph), "2" (ihl)
: "memory");
return (__force __sum16)sum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 21 | 65.62% | 1 | 25.00% |
| Al Viro | 6 | 18.75% | 1 | 25.00% |
| Joe Perches | 4 | 12.50% | 1 | 25.00% |
| Thomas Graf | 1 | 3.12% | 1 | 25.00% |
| Total | 32 | 100.00% | 4 | 100.00% |
/*
* Fold a partial checksum
*/
static inline __sum16 csum_fold(__wsum sum)
{
asm("addl %1, %0 ;\n"
"adcl $0xffff, %0 ;\n"
: "=r" (sum)
: "r" ((__force u32)sum << 16),
"0" ((__force u32)sum & 0xffff0000));
return (__force __sum16)(~(__force u32)sum >> 16);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 14 | 51.85% | 2 | 50.00% |
| Al Viro | 12 | 44.44% | 1 | 25.00% |
| Joe Perches | 1 | 3.70% | 1 | 25.00% |
| Total | 27 | 100.00% | 4 | 100.00% |
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
__u32 len, __u8 proto,
__wsum sum)
{
asm("addl %1, %0 ;\n"
"adcl %2, %0 ;\n"
"adcl %3, %0 ;\n"
"adcl $0, %0 ;\n"
: "=r" (sum)
: "g" (daddr), "g"(saddr),
"g" ((len + proto) << 8), "0" (sum));
return sum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 19 | 73.08% | 1 | 25.00% |
| Al Viro | 4 | 15.38% | 1 | 25.00% |
| Alexander Duyck | 2 | 7.69% | 1 | 25.00% |
| Joe Perches | 1 | 3.85% | 1 | 25.00% |
| Total | 26 | 100.00% | 4 | 100.00% |
/*
* 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,
__u32 len, __u8 proto,
__wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 33 | 84.62% | 3 | 60.00% |
| Al Viro | 4 | 10.26% | 1 | 20.00% |
| Alexander Duyck | 2 | 5.13% | 1 | 20.00% |
| Total | 39 | 100.00% | 5 | 100.00% |
/*
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
static inline __sum16 ip_compute_csum(const void *buff, int len)
{
return csum_fold(csum_partial(buff, len, 0));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 25 | 89.29% | 2 | 66.67% |
| Al Viro | 3 | 10.71% | 1 | 33.33% |
| Total | 28 | 100.00% | 3 | 100.00% |
#define _HAVE_ARCH_IPV6_CSUM
static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, __u8 proto, __wsum sum)
{
asm("addl 0(%1), %0 ;\n"
"adcl 4(%1), %0 ;\n"
"adcl 8(%1), %0 ;\n"
"adcl 12(%1), %0 ;\n"
"adcl 0(%2), %0 ;\n"
"adcl 4(%2), %0 ;\n"
"adcl 8(%2), %0 ;\n"
"adcl 12(%2), %0 ;\n"
"adcl %3, %0 ;\n"
"adcl %4, %0 ;\n"
"adcl $0, %0 ;\n"
: "=&r" (sum)
: "r" (saddr), "r" (daddr),
"r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
: "memory");
return csum_fold(sum);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 28 | 80.00% | 2 | 33.33% |
| Al Viro | 4 | 11.43% | 1 | 16.67% |
| Joe Perches | 1 | 2.86% | 1 | 16.67% |
| Alexander Duyck | 1 | 2.86% | 1 | 16.67% |
| Samuel Thibault | 1 | 2.86% | 1 | 16.67% |
| Total | 35 | 100.00% | 6 | 100.00% |
/*
* 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)
{
__wsum ret;
might_sleep();
if (access_ok(VERIFY_WRITE, dst, len)) {
stac();
ret = csum_partial_copy_generic(src, (__force void *)dst,
len, sum, NULL, err_ptr);
clac();
return ret;
}
if (len)
*err_ptr = -EFAULT;
return (__force __wsum)-1; /* invalid checksum */
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 62 | 64.58% | 2 | 25.00% |
| H. Peter Anvin | 16 | 16.67% | 1 | 12.50% |
| Al Viro | 13 | 13.54% | 2 | 25.00% |
| Ingo Molnar | 3 | 3.12% | 1 | 12.50% |
| Joe Perches | 1 | 1.04% | 1 | 12.50% |
| Stephen Hemminger | 1 | 1.04% | 1 | 12.50% |
| Total | 96 | 100.00% | 8 | 100.00% |
#endif /* _ASM_X86_CHECKSUM_32_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 324 | 70.59% | 14 | 45.16% |
| Al Viro | 67 | 14.60% | 2 | 6.45% |
| H. Peter Anvin | 33 | 7.19% | 2 | 6.45% |
| Joe Perches | 12 | 2.61% | 1 | 3.23% |
| Ingo Molnar | 6 | 1.31% | 1 | 3.23% |
| Alexander Duyck | 5 | 1.09% | 2 | 6.45% |
| Dave Jones | 3 | 0.65% | 1 | 3.23% |
| Alexey Dobriyan | 2 | 0.44% | 1 | 3.23% |
| Stephen Hemminger | 1 | 0.22% | 1 | 3.23% |
| Andrew Lutomirski | 1 | 0.22% | 1 | 3.23% |
| Linus Torvalds | 1 | 0.22% | 1 | 3.23% |
| Jesper Juhl | 1 | 0.22% | 1 | 3.23% |
| Samuel Thibault | 1 | 0.22% | 1 | 3.23% |
| Greg Kroah-Hartman | 1 | 0.22% | 1 | 3.23% |
| Thomas Graf | 1 | 0.22% | 1 | 3.23% |
| Total | 459 | 100.00% | 31 | 100.00% |
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