Add support for Portforwarding TCP/UDP using socat.

conf/main_ipv4.conf.sample

@@ -503,6 +503,49 @@ udp_out_ports=""
 forward_udp_out_ports=""
 
 
+
+# =============
+# --- Portforwarding
+# =============
+
+# - Portforwarding TCP
+# -
+# - portforward_tcp="<device-in>:<src-ip>:<port-in>:<ip-to-forward>:<port-out>"
+# -
+# - Multiple declarations (blank separated list) are possible
+# -
+# - Example:
+# -    portforward_tcp="${ext_if_1}:83.223.86.95:9997:192.168.52.25:22
+# -                     ${ext_if_1}:${ext_1_ip}:80:83.223.86.98:80
+# -                     ${ext_if_1}:${ext_1_ip}:443:83.223.86.98:443
+# -                     "
+# -
+# - Note!
+# -    be careful if you use a variable (e.g. ext_1_ip) that it contains NO SPACES.
+# -
+# - Blank separated list
+# -
+portforward_tcp=""
+
+
+# - Portforwarding UDP
+# -
+# - portforward_udp="<device-in>:<src-ip>:<udp-port-in>:<ip-to-forward>:<udp-port-out>"
+# -
+# - Multiple declarations (blank separated list) are possible
+# -
+# - Example:
+# -    portforward_udp="
+# -       ${ext_if_1}:${ext_1_ip}:1194:192.168.52.25:1194
+# -       ${ext_if_1}:${ext_1_ip}:1195:192.168.53.24:1195
+# -    "
+# -
+# - Blank separated list
+# -
+portforward_udp=""
+
+
+
 # -------------
 # --- Block IP's / IP-Ranges
 # -------------