Merge branch 'LTE-sidelink' of https://gitlab.eurecom.fr/oai/openairinterface5g into LTE-sidelink

relay_UE_routing.sh

 #!/bin/bash
+sudo iptables -t mangle -F
+sudo iptables -t nat -F
+
+# Load ue_ip module
+sudo rmmod ue_ip
+source oaienv
+cd cmake_targets/tools
+source init_nas_s1 UE
 
 # Sidelink interface configuration
 sudo ifconfig oip0 10.0.0.1
@@ -10,9 +18,13 @@ sudo ifconfig lo: 127.0.0.2 netmask 255.0.0.0 up
 
 # Routing and SLRB configuration for specific sidelink (10.0.0.2) and external(e.g., 8.8.8.8) destination addresses.
 sudo ip neigh add 10.0.0.2 lladdr 00:00:00:00:00:02 dev oip0 nud permanent
+sudo ip neigh change 10.0.0.2 lladdr 00:00:00:00:00:02 dev oip0 nud permanent
 
 sudo iptables -A POSTROUTING  -t mangle -o oip0 -d 10.0.0.2 -j MARK --set-mark 4
 
+# Mark outgoing MULTICAST traffic to group 224.0.0.3 with the SLRB ID
+sudo iptables -A POSTROUTING  -t mangle -o oip0 -d 224.0.0.3 -j MARK --set-mark 5
+
 sudo ip route add 8.8.8.8 dev oip1
 
 # Applying NAT so that the Remote UE originating/destined traffic does not get blocked at the PGW.