Add support for masquerading udp and icmp connections.

ipt-firewall-gateway

@@ -303,7 +303,7 @@ fi
 if [[ ${#no_if_for_ip_arr[@]} -gt 0 ]] ; then
    echo_warning
    for _ip in ${no_if_for_ip_arr[@]} ; do
-      warn "Masquerading for ip '$_ip' was omitted - No idestination interface present!"
+      warn "(TCP) Masquerading for ip '$_ip' was omitted - No destination interface present!"
    done
 else
    echo_done
@@ -311,6 +311,43 @@ fi
 echo
 
 
+unset no_if_for_ip_arr
+declare -a no_if_for_ip_arr
+if [[ ${#masquerade_udp_con_arr[@]} -gt 0 ]] && $kernel_activate_forwarding ; then
+   for _val in "${masquerade_udp_con_arr[@]}" ; do
+      IFS=':' read -a _val_arr <<< "${_val}"
+
+
+      # - Skip if no interface is given
+      # -
+      if [[ -z "${_val_arr[3]}" ]] ; then
+         no_if_for_ip_arr+=("${_val_arr[1]}")
+         continue
+      fi
+      $ipt -t nat -A POSTROUTING -o ${_val_arr[3]} -p udp -s ${_val_arr[0]} -d ${_val_arr[1]} --dport ${_val_arr[2]} -j MASQUERADE
+   done
+fi
+
+#echo_done # Flushing firewall iptable (IPv4)..
+if [[ ${#no_if_for_ip_arr[@]} -gt 0 ]] ; then
+   echo_warning
+   for _ip in ${no_if_for_ip_arr[@]} ; do
+      warn "(UDP) Masquerading for ip '$_ip' was omitted - No destination interface present!"
+   done
+else
+   echo_done
+fi
+echo
+
+if [[ ${#masquerade_icmp_con_arr[@]} -gt 0 ]] && $kernel_activate_forwarding ; then
+   for _val in "${masquerade_icmp_con_arr[@]}" ; do
+      IFS=':' read -a _val_arr <<< "${_val}"
+
+      $ipt -t nat -A POSTROUTING -p icmp -s ${_val_arr[0]} -d ${_val_arr[1]} -j MASQUERADE
+   done
+fi
+
+
 # -------------
 # - Log given IP Addresses
 # -------------