make gtp-u port on F1-U configurable

openair2/F1AP/f1ap_du_ue_context_management.c

@@ -157,7 +157,8 @@ int DU_handle_UE_CONTEXT_SETUP_REQUEST(instance_t       instance,
       F1AP_GTPTunnel_t *ul_up_tnl0 = ul_up_tnl_info_p->uLUPTNLInformation.choice.gTPTunnel;
       BIT_STRING_TO_TRANSPORT_LAYER_ADDRESS_IPv4(&ul_up_tnl0->transportLayerAddress, drb_p->up_ul_tnl[0].tl_address);
       OCTET_STRING_TO_INT32(&ul_up_tnl0->gTP_TEID, drb_p->up_ul_tnl[0].teid);
-      
+      // 3GPP assumes GTP-U is on port 2152, but OAI is configurable
+      drb_p->up_ul_tnl[0].port=getCxt(false,instance)->setupReq.CUport;
       switch (drbs_tobesetup_item_p->rLCMode) {
       case F1AP_RLCMode_rlc_am:
 	drb_p->rlc_mode = RLC_MODE_AM;
@@ -177,7 +178,7 @@ int DU_handle_UE_CONTEXT_SETUP_REQUEST(instance_t       instance,
 						     drb_p->drb_id,
 						     drb_p->up_ul_tnl[0].teid,
 						     addr,
-						     2152,
+						     drb_p->up_ul_tnl[0].port,
 						     lteDURecvCb);
 	drb_p->up_dl_tnl_length++;
       }