218 local function parse_cidr(cidr)

   219 	local bits;

   220 	local ip_len = cidr:find("/", 1, true);

   221 	if ip_len then

   222 		bits = tonumber(cidr:sub(ip_len+1, -1));

   223 		cidr = cidr:sub(1, ip_len-1);

   224 	end

   225 	return new_ip(cidr), bits;

   226 end

   227 

   228 local function match(ipA, ipB, bits)

   229 	local common_bits = commonPrefixLength(ipA, ipB);

   230 	if not bits then

   231 		return ipA == ipB;

   232 	end

   233 	if bits and ipB.proto == "IPv4" then

   234 		common_bits = common_bits - 96; -- v6 mapped addresses always share these bits

   235 	end

   236 	return common_bits >= bits;

   237 end

   238