include init_nas_s1 in the repository

init_nas_s1 may not work properly, but many people complain
about this file, so let's put it in the repository.

We'll fix it at some point if it's not properly usable.

cmake_targets/tools/init_nas_s1

+#!/bin/bash
+
+#WARNING: this file may not work properly, be sure to know what you
+#do when using it
+
+#/*
+# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+# * contributor license agreements.  See the NOTICE file distributed with
+# * this work for additional information regarding copyright ownership.
+# * The OpenAirInterface Software Alliance licenses this file to You under
+# * the OAI Public License, Version 1.0  (the "License"); you may not use this file
+# * except in compliance with the License.
+# * You may obtain a copy of the License at
+# *
+# *      http://www.openairinterface.org/?page_id=698
+# *
+# * Unless required by applicable law or agreed to in writing, software
+# * distributed under the License is distributed on an "AS IS" BASIS,
+# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# * See the License for the specific language governing permissions and
+# * limitations under the License.
+# *-------------------------------------------------------------------------------
+# * For more information about the OpenAirInterface (OAI) Software Alliance:
+# *      contact@openairinterface.org
+# */
+
+################################################################################
+# file init_nas_s1
+# brief loads the ue_ip module and sets up IP for the UE
+# you may want to edit it to fit your settings (replace oip0 by oipX for
+# instance)
+# author Florian Kaltenberger
+#
+#######################################
+
+LTEIF=oip0
+#OPENAIR_DIR=/home/oai/svn-oai/openair4G
+
+load_module() {
+  mod_name=${1##*/}
+  mod_name=${mod_name%.*}
+  if awk "/$mod_name/ {found=1 ;exit} END {if (found!=1) exit 1}" /proc/modules
+    then
+      echo "module $mod_name already loaded: I remove it first"
+      sudo rmmod $mod_name
+  fi
+  echo loading $mod_name
+  sudo insmod $1
+}
+
+load_module $OPENAIR_DIR/targets/bin/ue_ip.ko
+
+if [ "$1" = "UE" ]; then
+  echo "bring up oip0 interface for UE"
+  ifconfig oip0 up
+fi
+
+ip route flush cache
+sleep 1
+sysctl -w net.ipv4.conf.all.log_martians=1
+echo "Disabling reverse path filtering"
+sysctl -w net.ipv4.conf.all.rp_filter=0
+ip route flush cache
+
+# Check table 200 lte in /etc/iproute2/rt_tables
+fgrep lte /etc/iproute2/rt_tables  > /dev/null 
+if [ $? -ne 0 ]; then
+    echo "200 lte " >> /etc/iproute2/rt_tables
+fi
+ip rule add fwmark 1 table lte
+ip route add default dev $LTEIF table lte