/usr/src/xtables-addons-3.0/extensions/mac.c is in xtables-addons-dkms 3.0-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | static bool mac_parse(const char *addr, unsigned char *dest, uint8_t *mask)
{
unsigned int i = 0, value;
char *end;
for (i = 0; i < ETH_ALEN; ++i) {
value = strtoul(addr, &end, 16);
if (addr == end || value > 0xFF)
return false;
if (i == ETH_ALEN - 1) {
if (*end != '\0' && *end != '/')
return false;
} else if (*end != ':') {
return false;
}
dest[i] = value;
addr = end + 1;
}
*mask = 48;
if (*end == '/') {
if (!xtables_strtoui(end + 1, &end, &value, 0, 48))
return false;
if (*end != '\0')
return false;
}
return true;
}
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