bugfix CU/DU: use correct IP address for GTP-U

Not only the teid is received from the DU but also the IP address. We
have to use it too.

Also, don't connect the UDP socket. The parameter remote_s_address in the
configuration file must not be used, at least not for gtp-u because the
IP address is received from the DU (plus for later, for multiple DUs, it
won't work at all).

openair2/F1AP/f1ap_cu_task.c

@@ -41,12 +41,10 @@
 //Fixme: Uniq dirty DU instance, by global var, datamodel need better management
 instance_t CUuniqInstance=0;
 
-static instance_t cu_task_create_gtpu_instance_to_du(eth_params_t *IPaddrs) {
+static instance_t cu_task_create_gtpu_instance(eth_params_t *IPaddrs) {
   openAddr_t tmp= {0};
   strncpy(tmp.originHost, IPaddrs->my_addr, sizeof(tmp.originHost)-1);
-  strncpy(tmp.destinationHost, IPaddrs->remote_addr, sizeof(tmp.destinationHost)-1);
-  sprintf(tmp.originService, "%d",  IPaddrs->my_portd);
-  sprintf(tmp.destinationService, "%d",  IPaddrs->remote_portd);
+  sprintf(tmp.originService, "%d", IPaddrs->my_portd);
   return gtpv1Init(tmp);
 }
 
@@ -59,7 +57,7 @@ static void cu_task_handle_sctp_association_ind(instance_t instance, sctp_new_as
   f1ap_cu_data->sctp_in_streams  = sctp_new_association_ind->in_streams;
   f1ap_cu_data->sctp_out_streams = sctp_new_association_ind->out_streams;
   f1ap_cu_data->default_sctp_stream_id = 0;
-  getCxt(CUtype, instance)->gtpInst=cu_task_create_gtpu_instance_to_du(IPaddrs);
+  getCxt(CUtype, instance)->gtpInst=cu_task_create_gtpu_instance(IPaddrs);
   AssertFatal(getCxt(CUtype, instance)->gtpInst>0,"Failed to create CU F1-U UDP listener");
   // Fixme: fully inconsistent instances management
   // dirty global var is a bad fix

openair2/F1AP/f1ap_cu_ue_context_management.c

@@ -510,18 +510,15 @@ int CU_send_UE_CONTEXT_SETUP_REQUEST(instance_t instance,
 
       /* 12.1.3 uLUPTNLInformation_ToBeSetup_List */
       for (int j = 0; j < f1ap_ue_context_setup_req->drbs_to_be_setup[i].up_ul_tnl_length; j++) {
-        /*Use a dummy teid for the outgoing GTP-U tunnel (DU) which will be updated once we get the UE context setup response from the DU*/
-        transport_layer_addr_t addr;
-        int sz=sizeof(f1ap_ue_context_setup_req->drbs_to_be_setup[i].up_dl_tnl[0].tl_address);
-        memcpy(addr.buffer,&f1ap_ue_context_setup_req->drbs_to_be_setup[i].up_dl_tnl[0].tl_address, sz);
-        addr.length = sz*8;
+        /* Use a dummy address and teid for the outgoing GTP-U tunnel (DU) which will be updated once we get the UE context setup response from the DU */
+        transport_layer_addr_t addr = { length: 32, buffer: { 0 } };
         f1ap_ue_context_setup_req->drbs_to_be_setup[i].up_ul_tnl[j].teid = newGtpuCreateTunnel(getCxt(CUtype, instance)->gtpInst,
                                                                                                f1ap_ue_context_setup_req->rnti,
                                                                                                f1ap_ue_context_setup_req->drbs_to_be_setup[i].drb_id,
                                                                                                f1ap_ue_context_setup_req->drbs_to_be_setup[i].drb_id,
                                                                                                0xFFFF, // We will set the right value from DU answer
                                                                                                -1, // no qfi
-                                                                                               addr,
+                                                                                               addr,   // We will set the right value from DU answer
                                                                                                f1ap_ue_context_setup_req->drbs_to_be_setup[i].up_dl_tnl[0].port,
                                                                                                cu_f1u_data_req,
                                                                                                NULL);
@@ -700,10 +697,11 @@ int CU_handle_UE_CONTEXT_SETUP_RESPONSE(instance_t       instance,
       F1AP_GTPTunnel_t *dl_up_tnl0 = dl_up_tnl_info_p->dLUPTNLInformation.choice.gTPTunnel;
       BIT_STRING_TO_TRANSPORT_LAYER_ADDRESS_IPv4(&dl_up_tnl0->transportLayerAddress, drb_p->up_dl_tnl[0].tl_address);
       OCTET_STRING_TO_INT32(&dl_up_tnl0->gTP_TEID, drb_p->up_dl_tnl[0].teid);
-      GtpuUpdateTunnelOutgoingTeid(getCxt(CUtype, instance)->gtpInst,
-                                   f1ap_ue_context_setup_resp->rnti,
-                                   (ebi_t)drbs_setup_item_p->dRBID,
-                                   drb_p->up_dl_tnl[0].teid);
+      GtpuUpdateTunnelOutgoingAddressAndTeid(getCxt(CUtype, instance)->gtpInst,
+                                             f1ap_ue_context_setup_resp->rnti,
+                                             (ebi_t)drbs_setup_item_p->dRBID,
+                                             drb_p->up_dl_tnl[0].tl_address,
+                                             drb_p->up_dl_tnl[0].teid);
     }
   }
 
@@ -1478,11 +1476,8 @@ int CU_send_UE_CONTEXT_MODIFICATION_REQUEST(instance_t instance, f1ap_ue_context
 
       /* 12.1.3 uLUPTNLInformation_ToBeSetup_List */
       for (int j = 0; j < f1ap_ue_context_modification_req->drbs_to_be_setup[i].up_ul_tnl_length; j++) {
-        /*Use a dummy teid for the outgoing GTP-U tunnel (DU) which will be updated once we get the UE context setup response from the DU*/
-        transport_layer_addr_t addr;
-        int sz=sizeof(f1ap_ue_context_modification_req->drbs_to_be_setup[i].up_dl_tnl[0].tl_address);
-        memcpy(addr.buffer,&f1ap_ue_context_modification_req->drbs_to_be_setup[i].up_dl_tnl[0].tl_address, sz);
-        addr.length = sz*8;
+        /* Use a dummy address and teid for the outgoing GTP-U tunnel (DU) which will be updated once we get the UE context modification response from the DU */
+        transport_layer_addr_t addr = { length: 32, buffer: { 0 } };
 
         f1ap_ue_context_modification_req->drbs_to_be_setup[i].up_ul_tnl[j].teid = newGtpuCreateTunnel(getCxt(CUtype, instance)->gtpInst,
                                                                                                       f1ap_ue_context_modification_req->rnti,
@@ -1490,7 +1485,7 @@ int CU_send_UE_CONTEXT_MODIFICATION_REQUEST(instance_t instance, f1ap_ue_context
                                                                                                       f1ap_ue_context_modification_req->drbs_to_be_setup[i].drb_id,
                                                                                                       0xFFFF, // We will set the right value from DU answer
                                                                                                       -1, // no qfi
-                                                                                                      addr,
+                                                                                                      addr,   // We will set the right value from DU answer
                                                                                                       f1ap_ue_context_modification_req->drbs_to_be_setup[i].up_dl_tnl[0].port,
                                                                                                       cu_f1u_data_req,
                                                                                                       NULL);
@@ -1702,9 +1697,10 @@ int CU_handle_UE_CONTEXT_MODIFICATION_RESPONSE(instance_t       instance,
         F1AP_GTPTunnel_t *dl_up_tnl0 = dl_up_tnl_info_p->dLUPTNLInformation.choice.gTPTunnel;
         BIT_STRING_TO_TRANSPORT_LAYER_ADDRESS_IPv4(&dl_up_tnl0->transportLayerAddress, drb_p->up_dl_tnl[0].tl_address);
         OCTET_STRING_TO_INT32(&dl_up_tnl0->gTP_TEID, drb_p->up_dl_tnl[0].teid);
-        GtpuUpdateTunnelOutgoingTeid(getCxt(CUtype, instance)->gtpInst,
+        GtpuUpdateTunnelOutgoingAddressAndTeid(getCxt(CUtype, instance)->gtpInst,
                      f1ap_ue_context_modification_resp->rnti,
                      (ebi_t)drbs_setupmod_item_p->dRBID,
+                     drb_p->up_dl_tnl[0].tl_address,
                      drb_p->up_dl_tnl[0].teid);
       }
     }

openair3/ocp-gtpu/gtp_itf.cpp

@@ -552,7 +552,7 @@ instance_t gtpv1Init(openAddr_t context) {
   return id;
 }
 
-void GtpuUpdateTunnelOutgoingTeid(instance_t instance, ue_id_t ue_id, ebi_t bearer_id, teid_t newOutgoingTeid) {
+void GtpuUpdateTunnelOutgoingAddressAndTeid(instance_t instance, ue_id_t ue_id, ebi_t bearer_id, in_addr_t newOutgoingAddr, teid_t newOutgoingTeid) {
   pthread_mutex_lock(&globGtp.gtp_lock);
   getInstRetVoid(compatInst(instance));
   getUeRetVoid(inst, ue_id);
@@ -565,8 +565,9 @@ void GtpuUpdateTunnelOutgoingTeid(instance_t instance, ue_id_t ue_id, ebi_t bear
     return;
   }
 
+  ptr2->second.outgoing_ip_addr = newOutgoingAddr;
   ptr2->second.teid_outgoing = newOutgoingTeid;
-  LOG_I(GTPU, "[%ld] Tunnel Outgoing TEID updated to %x \n", instance, ptr2->second.teid_outgoing);
+  LOG_I(GTPU, "[%ld] Tunnel Outgoing TEID updated to %x and address to %x\n", instance, ptr2->second.teid_outgoing, ptr2->second.outgoing_ip_addr);
   pthread_mutex_unlock(&globGtp.gtp_lock);
   return;
 }

openair3/ocp-gtpu/gtp_itf.h

@@ -92,10 +92,11 @@ extern "C" {
                              gtpCallback callBack,
                              gtpCallbackSDAP callBackSDAP);
 
-  void GtpuUpdateTunnelOutgoingTeid(instance_t instance,
-                                    ue_id_t ue_id,
-                                    ebi_t bearer_id,
-                                    teid_t newOutgoingTeid);
+  void GtpuUpdateTunnelOutgoingAddressAndTeid(instance_t instance,
+                                              ue_id_t ue_id,
+                                              ebi_t bearer_id,
+                                              in_addr_t newOutgoingAddr,
+                                              teid_t newOutgoingTeid);
 
   int newGtpuDeleteAllTunnels(instance_t instance, ue_id_t ue_id);
   int newGtpuDeleteTunnels(instance_t instance, ue_id_t ue_id, int nbTunnels, pdusessionid_t *pdusession_id);