Restructure project and organize code.

src/xdp/utils/helpers.c

@@ -0,0 +1,15 @@
+#include <xdp/utils/helpers.h>
+
+/**
+ * Checks if an IP is within a specific CIDR range.
+ * 
+ * @param src_ip The source/main IP to check against.
+ * @param net_ip The network IP.
+ * @param cidr The CIDR range.
+ * 
+ * @return 1 on yes, 0 on no.
+*/
+static __always_inline u8 IsIpInRange(u32 src_ip, u32 net_ip, u8 cidr)
+{
+    return !((src_ip ^ net_ip) & htonl(0xFFFFFFFFu << (32 - cidr)));
+}