mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
185 lines
5.0 KiB
185 lines
5.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _ASM_X86_CHECKSUM_64_H |
|
#define _ASM_X86_CHECKSUM_64_H |
|
|
|
/* |
|
* Checksums for x86-64 |
|
* Copyright 2002 by Andi Kleen, SuSE Labs |
|
* with some code from asm-x86/checksum.h |
|
*/ |
|
|
|
#include <linux/compiler.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/byteorder.h> |
|
|
|
/** |
|
* csum_fold - Fold and invert a 32bit checksum. |
|
* sum: 32bit unfolded sum |
|
* |
|
* Fold a 32bit running checksum to 16bit and invert it. This is usually |
|
* the last step before putting a checksum into a packet. |
|
* Make sure not to mix with 64bit checksums. |
|
*/ |
|
static inline __sum16 csum_fold(__wsum sum) |
|
{ |
|
asm(" addl %1,%0\n" |
|
" adcl $0xffff,%0" |
|
: "=r" (sum) |
|
: "r" ((__force u32)sum << 16), |
|
"0" ((__force u32)sum & 0xffff0000)); |
|
return (__force __sum16)(~(__force u32)sum >> 16); |
|
} |
|
|
|
/* |
|
* This is a version of ip_compute_csum() optimized for IP headers, |
|
* which always checksum on 4 octet boundaries. |
|
* |
|
* By Jorge Cwik <[email protected]>, adapted for linux by |
|
* Arnt Gulbrandsen. |
|
*/ |
|
|
|
/** |
|
* ip_fast_csum - Compute the IPv4 header checksum efficiently. |
|
* iph: ipv4 header |
|
* ihl: length of header / 4 |
|
*/ |
|
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
|
{ |
|
unsigned int sum; |
|
|
|
asm(" 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:" |
|
/* 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; |
|
} |
|
|
|
/** |
|
* csum_tcpup_nofold - Compute an IPv4 pseudo header checksum. |
|
* @saddr: source address |
|
* @daddr: destination address |
|
* @len: length of packet |
|
* @proto: ip protocol of packet |
|
* @sum: initial sum to be added in (32bit unfolded) |
|
* |
|
* Returns the pseudo header checksum the input data. Result is |
|
* 32bit unfolded. |
|
*/ |
|
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; |
|
} |
|
|
|
|
|
/** |
|
* csum_tcpup_magic - Compute an IPv4 pseudo header checksum. |
|
* @saddr: source address |
|
* @daddr: destination address |
|
* @len: length of packet |
|
* @proto: ip protocol of packet |
|
* @sum: initial sum to be added in (32bit unfolded) |
|
* |
|
* Returns the 16bit pseudo header checksum the input data already |
|
* complemented and ready to be filled in. |
|
*/ |
|
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)); |
|
} |
|
|
|
/** |
|
* csum_partial - Compute an internet checksum. |
|
* @buff: buffer to be checksummed |
|
* @len: length of buffer. |
|
* @sum: initial sum to be added in (32bit unfolded) |
|
* |
|
* Returns the 32bit unfolded internet checksum of the buffer. |
|
* Before filling it in it needs to be csum_fold()'ed. |
|
* buff should be aligned to a 64bit boundary if possible. |
|
*/ |
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
|
|
|
/* Do not call this directly. Use the wrappers below */ |
|
extern __visible __wsum csum_partial_copy_generic(const void *src, void *dst, int len); |
|
|
|
extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len); |
|
extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len); |
|
extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len); |
|
|
|
/** |
|
* ip_compute_csum - Compute an 16bit IP checksum. |
|
* @buff: buffer address. |
|
* @len: length of buffer. |
|
* |
|
* Returns the 16bit folded/inverted checksum of the passed buffer. |
|
* Ready to fill in. |
|
*/ |
|
extern __sum16 ip_compute_csum(const void *buff, int len); |
|
|
|
/** |
|
* csum_ipv6_magic - Compute checksum of an IPv6 pseudo header. |
|
* @saddr: source address |
|
* @daddr: destination address |
|
* @len: length of packet |
|
* @proto: protocol of packet |
|
* @sum: initial sum (32bit unfolded) to be added in |
|
* |
|
* Computes an IPv6 pseudo header checksum. This sum is added the checksum |
|
* into UDP/TCP packets and contains some link layer information. |
|
* Returns the unfolded 32bit checksum. |
|
*/ |
|
|
|
struct in6_addr; |
|
|
|
#define _HAVE_ARCH_IPV6_CSUM 1 |
|
extern __sum16 |
|
csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, |
|
__u32 len, __u8 proto, __wsum sum); |
|
|
|
static inline unsigned add32_with_carry(unsigned a, unsigned b) |
|
{ |
|
asm("addl %2,%0\n\t" |
|
"adcl $0,%0" |
|
: "=r" (a) |
|
: "0" (a), "rm" (b)); |
|
return a; |
|
} |
|
|
|
#define HAVE_ARCH_CSUM_ADD |
|
static inline __wsum csum_add(__wsum csum, __wsum addend) |
|
{ |
|
return (__force __wsum)add32_with_carry((__force unsigned)csum, |
|
(__force unsigned)addend); |
|
} |
|
|
|
#endif /* _ASM_X86_CHECKSUM_64_H */
|
|
|