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05fb3dbda1
Although iph is expected to point to at least 20 bytes of valid memory,
ihl may be bogus, for example on reception of a corrupt packet. If it
happens to be less than 5, we really don't want to run away and
dereference 16GB worth of memory until it wraps back to exactly zero...
Fixes: 0e455d8e80 ("arm64: Implement optimised IP checksum helpers")
Reported-by: guodeqing <geffrey.guo@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016 ARM Ltd.
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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/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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static inline __sum16 csum_fold(__wsum csum)
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{
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u32 sum = (__force u32)csum;
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sum += (sum >> 16) | (sum << 16);
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return ~(__force __sum16)(sum >> 16);
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}
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#define csum_fold csum_fold
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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__uint128_t tmp;
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u64 sum;
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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 += ((sum >> 32) | (sum << 32));
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return csum_fold((__force u32)(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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