u-boot/lib/net_utils.c
Simon Glass d721001fd6 net: Move the checksum functions to lib/
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>
2019-12-15 11:43:57 +08:00

106 lines
2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Generic network code. Moved from net.c
*
* Copyright 1994 - 2000 Neil Russell.
* Copyright 2000 Roland Borde
* Copyright 2000 Paolo Scaffardi
* Copyright 2000-2002 Wolfgang Denk, wd@denx.de
* Copyright 2009 Dirk Behme, dirk.behme@googlemail.com
*/
#include <common.h>
struct in_addr string_to_ip(const char *s)
{
struct in_addr addr;
char *e;
int i;
addr.s_addr = 0;
if (s == NULL)
return addr;
for (addr.s_addr = 0, i = 0; i < 4; ++i) {
ulong val = s ? simple_strtoul(s, &e, 10) : 0;
if (val > 255) {
addr.s_addr = 0;
return addr;
}
if (i != 3 && *e != '.') {
addr.s_addr = 0;
return addr;
}
addr.s_addr <<= 8;
addr.s_addr |= (val & 0xFF);
if (s) {
s = (*e) ? e+1 : e;
}
}
addr.s_addr = htonl(addr.s_addr);
return addr;
}
void string_to_enetaddr(const char *addr, uint8_t *enetaddr)
{
char *end;
int i;
if (!enetaddr)
return;
for (i = 0; i < 6; ++i) {
enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
if (addr)
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);
}