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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* This file was originally taken from the FreeBSD project.
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*
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* Copyright (c) 2001 Charles Mott <cm@linktel.net>
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* Copyright (c) 2008 coresystems GmbH
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* All rights reserved.
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*/
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#include <common.h>
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#include <net.h>
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unsigned compute_ip_checksum(const void *vptr, unsigned nbytes)
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{
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int sum, oddbyte;
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const unsigned short *ptr = vptr;
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sum = 0;
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while (nbytes > 1) {
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sum += *ptr++;
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nbytes -= 2;
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}
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if (nbytes == 1) {
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oddbyte = 0;
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((u8 *)&oddbyte)[0] = *(u8 *)ptr;
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((u8 *)&oddbyte)[1] = 0;
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sum += oddbyte;
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}
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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sum = ~sum & 0xffff;
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return sum;
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}
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unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new)
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{
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unsigned long checksum;
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sum = ~sum & 0xffff;
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new = ~new & 0xffff;
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if (offset & 1) {
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/*
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* byte-swap the sum if it came from an odd offset; since the
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* computation is endian independant this works.
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*/
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new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
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}
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checksum = sum + new;
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if (checksum > 0xffff)
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checksum -= 0xffff;
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return (~checksum) & 0xffff;
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}
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int ip_checksum_ok(const void *addr, unsigned nbytes)
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{
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return !(compute_ip_checksum(addr, nbytes) & 0xfffe);
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}
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