[Feature] add GA346 baseline version

Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/extended/hw_nat/util.h b/src/extended/hw_nat/util.h
new file mode 100644
index 0000000..aa57d19
--- /dev/null
+++ b/src/extended/hw_nat/util.h
@@ -0,0 +1,3 @@
+int str_to_mac (unsigned char *mac, char *str);
+int str_to_ip (unsigned int *ip, char *str);
+int str_to_ipv6 ( unsigned int * ipv6, char *str, unsigned int byte);