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net: Move the checksum functions to lib/

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These functions are used by code outside the network support, so move them
to lib/ to be more accessible.

Without this, the functions are only accessible in SPL/TPL only if
CONFIG_SPL/TPL_NET are defined. Many boards do not enable those option but
still want to do checksums in this format.

Fix up a few code-style nits while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-12-06 21:41:39 -07:00 committed by Bin Meng
parent 6dd4b01432
commit d721001fd6
4 changed files with 49 additions and 61 deletions
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2
lib/Makefile
View File

@ -78,7 +78,7 @@ endif
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o
obj-$(CONFIG_$(SPL_TPL_)HASH_SUPPORT) += crc16.o
obj-$(CONFIG_SPL_NET_SUPPORT) += net_utils.o
obj-y += net_utils.o
endif
obj-$(CONFIG_ADDR_MAP) += addr_map.o
obj-y += qsort.o

48
lib/net_utils.c
View File

@ -56,3 +56,51 @@ void string_to_enetaddr(const char *addr, uint8_t *enetaddr)
addr = (*end) ? end + 1 : end;
}
}
uint compute_ip_checksum(const void *vptr, uint nbytes)
{
int sum, oddbyte;
const unsigned short *ptr = vptr;
sum = 0;
while (nbytes > 1) {
sum += *ptr++;
nbytes -= 2;
}
if (nbytes == 1) {
oddbyte = 0;
((u8 *)&oddbyte)[0] = *(u8 *)ptr;
((u8 *)&oddbyte)[1] = 0;
sum += oddbyte;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
sum = ~sum & 0xffff;
return sum;
}
uint add_ip_checksums(uint offset, uint sum, uint new)
{
ulong checksum;
sum = ~sum & 0xffff;
new = ~new & 0xffff;
if (offset & 1) {
/*
* byte-swap the sum if it came from an odd offset; since the
* computation is endian-independent this works.
*/
new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
}
checksum = sum + new;
if (checksum > 0xffff)
checksum -= 0xffff;
return (~checksum) & 0xffff;
}
int ip_checksum_ok(const void *addr, uint nbytes)
{
return !(compute_ip_checksum(addr, nbytes) & 0xfffe);
}

1
net/Makefile
View File

@ -5,7 +5,6 @@
#ccflags-y += -DDEBUG
obj-y += checksum.o
obj-$(CONFIG_NET) += arp.o
obj-$(CONFIG_CMD_BOOTP) += bootp.o
obj-$(CONFIG_CMD_CDP) += cdp.o

59
net/checksum.c
View File

@ -1,59 +0,0 @@
// SPDX-License-Identifier: BSD-2-Clause
/*
* This file was originally taken from the FreeBSD project.
*
* Copyright (c) 2001 Charles Mott <cm@linktel.net>
* Copyright (c) 2008 coresystems GmbH
* All rights reserved.
*/
#include <common.h>
#include <net.h>
unsigned compute_ip_checksum(const void *vptr, unsigned nbytes)
{
int sum, oddbyte;
const unsigned short *ptr = vptr;
sum = 0;
while (nbytes > 1) {
sum += *ptr++;
nbytes -= 2;
}
if (nbytes == 1) {
oddbyte = 0;
((u8 *)&oddbyte)[0] = *(u8 *)ptr;
((u8 *)&oddbyte)[1] = 0;
sum += oddbyte;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
sum = ~sum & 0xffff;
return sum;
}
unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new)
{
unsigned long checksum;
sum = ~sum & 0xffff;
new = ~new & 0xffff;
if (offset & 1) {
/*
* byte-swap the sum if it came from an odd offset; since the
* computation is endian independant this works.
*/
new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
}
checksum = sum + new;
if (checksum > 0xffff)
checksum -= 0xffff;
return (~checksum) & 0xffff;
}
int ip_checksum_ok(const void *addr, unsigned nbytes)
{
return !(compute_ip_checksum(addr, nbytes) & 0xfffe);
}