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// 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 <net.h>
#include <net6.h>
#include <vsprintf.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 ? dectoul(s, &e) : 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;
}
#if IS_ENABLED(CONFIG_IPV6)
int string_to_ip6(const char *str, size_t len, struct in6_addr *addr)
{
int colon_count = 0;
int found_double_colon = 0;
int xstart = 0; /* first zero (double colon) */
int section_num = 7; /* num words the double colon represents */
int i;
const char *s = str;
const char *const e = s + len;
struct in_addr zero_ip = {.s_addr = 0};
if (!str)
return -1;
/* First pass, verify the syntax and locate the double colon */
while (s < e) {
while (s < e && isxdigit((int)*s))
s++;
if (*s == '\0')
break;
if (*s != ':') {
if (*s == '.' && section_num >= 2) {
struct in_addr v4;
while (s != str && *(s - 1) != ':')
--s;
v4 = string_to_ip(s);
if (memcmp(&zero_ip, &v4,
sizeof(struct in_addr)) != 0) {
section_num -= 2;
break;
}
}
/* This could be a valid address */
break;
}
if (s == str) {
/* The address begins with a colon */
if (*++s != ':')
/* Must start with a double colon or a number */
goto out_err;
} else {
s++;
if (found_double_colon)
section_num--;
else
xstart++;
}
if (*s == ':') {
if (found_double_colon)
/* Two double colons are not allowed */
goto out_err;
found_double_colon = 1;
section_num -= xstart;
s++;
}
if (++colon_count == 7)
/* Found all colons */
break;
++s;
}
if (colon_count == 0)
goto out_err;
if (*--s == ':')
section_num++;
/* Second pass, read the address */
s = str;
for (i = 0; i < 8; i++) {
int val = 0;
char *end;
if (found_double_colon &&
i >= xstart && i < xstart + section_num) {
addr->s6_addr16[i] = 0;
continue;
}
while (*s == ':')
s++;
if (i == 6 && isdigit((int)*s)) {
struct in_addr v4 = string_to_ip(s);
if (memcmp(&zero_ip, &v4,
sizeof(struct in_addr)) != 0) {
/* Ending with :IPv4-address */
addr->s6_addr32[3] = v4.s_addr;
break;
}
}
val = simple_strtoul(s, &end, 16);
if (end != e && *end != '\0' && *end != ':')
goto out_err;
addr->s6_addr16[i] = htons(val);
s = end;
}
return 0;
out_err:
return -1;
}
#endif
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 ? hextoul(addr, &end) : 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);
}
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