67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016 ARM Ltd.
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* Copyright (C) 2023 Loongson Technology Corporation Limited
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*/
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#ifndef __ASM_CHECKSUM_H
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#define __ASM_CHECKSUM_H
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#include <linux/bitops.h>
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#include <linux/in6.h>
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#define _HAVE_ARCH_IPV6_CSUM
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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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* turns a 32-bit partial checksum (e.g. from csum_partial) into a
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* 1's complement 16-bit checksum.
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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u32 tmp = (__force u32)sum;
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/*
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* swap the two 16-bit halves of sum
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* if there is a carry from adding the two 16-bit halves,
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* it will carry from the lower half into the upper half,
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* giving us the correct sum in the upper half.
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*/
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return (__force __sum16)(~(tmp + rol32(tmp, 16)) >> 16);
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}
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#define csum_fold csum_fold
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries. ihl is the number
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* of 32-bit words and is always >= 5.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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u64 sum;
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__uint128_t tmp;
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int n = ihl; /* we want it signed */
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tmp = *(const __uint128_t *)iph;
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iph += 16;
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n -= 4;
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tmp += ((tmp >> 64) | (tmp << 64));
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sum = tmp >> 64;
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do {
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sum += *(const u32 *)iph;
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iph += 4;
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} while (--n > 0);
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sum += ror64(sum, 32);
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return csum_fold((__force __wsum)(sum >> 32));
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}
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#define ip_fast_csum ip_fast_csum
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extern unsigned int do_csum(const unsigned char *buff, int len);
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#define do_csum do_csum
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#include <asm-generic/checksum.h>
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#endif /* __ASM_CHECKSUM_H */
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