function ip_in_network6($ip, $net_addr, $net_mask = false)
{
if (!$net_mask && strpos($net_addr, "/") !== false) {
$cidr_arr = explode("/", $net_addr);
$net_addr = $cidr_arr[0];
$net_mask = $cidr_arr[1];
}
$ip = inet6_expand($ip);
$net_addr = inet6_expand($net_addr);
$net_mask_hex = inet6_expand(inet6_prefix_to_mask($net_mask));
$ip_dec_arr = inet6_to_int64($ip);
$net_dec_arr = inet6_to_int64($net_addr);
$mask_dec_arr = inet6_to_int64($net_mask_hex);
// Need to handle >64 bit net masks
if ($net_mask > 64) {
$net_mask_64_arr[0] = 64;
$net_mask_64_arr[1] = 64 - (128 - $net_mask);
} else {
$net_mask_64_arr[0] = $net_mask;
$net_mask_64_arr[1] = false;
}
if ((substr(gmp_convert($ip_dec_arr[0], 10, 2), 0, $net_mask_64_arr[0]) & substr(gmp_convert($mask_dec_arr[0], 10, 2), 0, $net_mask_64_arr[0])) == substr(gmp_convert($net_dec_arr[0], 10, 2), 0, $net_mask_64_arr[0])) {
if ($net_mask_64_arr[1]) {
if ((substr(gmp_convert($ip_dec_arr[1], 10, 2), 0, $net_mask_64_arr[1]) & substr(gmp_convert($mask_dec_arr[1], 10, 2), 0, $net_mask_64_arr[1])) != substr(gmp_convert($net_dec_arr[1], 10, 2), 0, $net_mask_64_arr[1])) {
return false;
}
}
return true;
}
}
/**
* Convert an IPv6 address and prefix size to an address range for the network.
*
* This will take an IPv6 address and prefix and return the first and last address available for the network.
*
* @param string $addr A valid IPv6 address
* @param integer $prefix The prefix size, an integer between 1 and 127 (inclusive)
* @return array An array with two strings containing the start and end address for the IPv6 network
*/
function inet6_to_range($addr, $prefix)
{
$size = 128 - $prefix;
$addr = gmp_init('0x' . str_replace(':', '', inet6_expand($addr)));
$mask = gmp_init('0x' . str_replace(':', '', inet6_expand(inet6_prefix_to_mask($prefix))));
$prefix = gmp_and($addr, $mask);
$start = gmp_strval(gmp_add($prefix, '0x1'), 16);
$end = '0b';
for ($i = 0; $i < $size; $i++) {
$end .= '1';
}
$end = gmp_strval(gmp_add($prefix, gmp_init($end)), 16);
for ($i = 0; $i < 8; $i++) {
$start_result .= substr($start, $i * 4, 4);
if ($i != 7) {
$start_result .= ':';
}
}
// for
for ($i = 0; $i < 8; $i++) {
$end_result .= substr($end, $i * 4, 4);
if ($i != 7) {
$end_result .= ':';
}
}
// for
$result = array(inet6_compress($start_result), inet6_compress($end_result));
return $result;
}
