From 2208be8b2d7dfcd884db9013fb8347d6856fa43c Mon Sep 17 00:00:00 2001
From: Chris Buechler <cmb@pfsense.org>
Date: Sat, 25 Jun 2016 01:34:05 -0500
Subject: [PATCH] bring back subnetv4_expand function used by pfblockerng

---
 src/etc/inc/util.inc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/etc/inc/util.inc b/src/etc/inc/util.inc
index 0b78e7fee9..e19f5b5578 100644
--- a/src/etc/inc/util.inc
+++ b/src/etc/inc/util.inc
@@ -877,6 +877,20 @@ function subnet_size_by_netmask($iptype, $bits, $exact=false) {
 	}
 }
 
+/* function used by pfblockerng */
+function subnetv4_expand($subnet) {
+	$result = array();
+	list ($ip, $bits) = explode("/", $subnet);
+	$net = ip2long($ip);
+	$mask = (0xffffffff << (32 - $bits));
+	$net &= $mask;
+	$size = round(exp(log(2) * (32 - $bits)));
+	for ($i = 0; $i < $size; $i += 1) {
+		$result[] = long2ip($net | $i);
+	}
+	return $result;
+}
+
 /* find out whether two IPv4/IPv6 CIDR subnets overlap.
    Note: CIDR overlap implies one is identical or included so largest sn will be the same */
 function check_subnets_overlap($subnet1, $bits1, $subnet2, $bits2) {