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99 lines
2.6 KiB
99 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2002, 2003 Andi Kleen, SuSE Labs. |
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* |
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* Wrappers of assembly checksum functions for x86-64. |
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*/ |
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#include <asm/checksum.h> |
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#include <linux/export.h> |
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#include <linux/uaccess.h> |
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#include <asm/smap.h> |
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/** |
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* csum_and_copy_from_user - Copy and checksum from user space. |
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* @src: source address (user space) |
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* @dst: destination address |
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* @len: number of bytes to be copied. |
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* @isum: initial sum that is added into the result (32bit unfolded) |
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* @errp: set to -EFAULT for an bad source address. |
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* |
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* Returns an 32bit unfolded checksum of the buffer. |
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* src and dst are best aligned to 64bits. |
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*/ |
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__wsum |
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csum_and_copy_from_user(const void __user *src, void *dst, int len) |
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{ |
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__wsum sum; |
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might_sleep(); |
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if (!user_access_begin(src, len)) |
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return 0; |
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sum = csum_partial_copy_generic((__force const void *)src, dst, len); |
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user_access_end(); |
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return sum; |
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} |
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EXPORT_SYMBOL(csum_and_copy_from_user); |
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/** |
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* csum_and_copy_to_user - Copy and checksum to user space. |
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* @src: source address |
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* @dst: destination address (user space) |
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* @len: number of bytes to be copied. |
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* @isum: initial sum that is added into the result (32bit unfolded) |
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* @errp: set to -EFAULT for an bad destination address. |
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* |
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* Returns an 32bit unfolded checksum of the buffer. |
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* src and dst are best aligned to 64bits. |
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*/ |
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__wsum |
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csum_and_copy_to_user(const void *src, void __user *dst, int len) |
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{ |
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__wsum sum; |
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might_sleep(); |
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if (!user_access_begin(dst, len)) |
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return 0; |
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sum = csum_partial_copy_generic(src, (void __force *)dst, len); |
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user_access_end(); |
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return sum; |
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} |
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EXPORT_SYMBOL(csum_and_copy_to_user); |
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/** |
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* csum_partial_copy_nocheck - Copy and checksum. |
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* @src: source address |
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* @dst: destination address |
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* @len: number of bytes to be copied. |
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* @sum: initial sum that is added into the result (32bit unfolded) |
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* |
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* Returns an 32bit unfolded checksum of the buffer. |
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*/ |
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__wsum |
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csum_partial_copy_nocheck(const void *src, void *dst, int len) |
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{ |
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return csum_partial_copy_generic(src, dst, len); |
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} |
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EXPORT_SYMBOL(csum_partial_copy_nocheck); |
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum sum) |
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{ |
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__u64 rest, sum64; |
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rest = (__force __u64)htonl(len) + (__force __u64)htons(proto) + |
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(__force __u64)sum; |
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asm(" addq (%[saddr]),%[sum]\n" |
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" adcq 8(%[saddr]),%[sum]\n" |
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" adcq (%[daddr]),%[sum]\n" |
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" adcq 8(%[daddr]),%[sum]\n" |
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" adcq $0,%[sum]\n" |
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: [sum] "=r" (sum64) |
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: "[sum]" (rest), [saddr] "r" (saddr), [daddr] "r" (daddr)); |
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return csum_fold( |
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(__force __wsum)add32_with_carry(sum64 & 0xffffffff, sum64>>32)); |
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} |
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EXPORT_SYMBOL(csum_ipv6_magic);
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