new gtp before tests

cmake_targets/CMakeLists.txt

@@ -2883,8 +2883,8 @@ add_dependencies(lte-softmodem rrc_flag s1ap_flag x2_flag oai_iqplayer)
 
 target_link_libraries (lte-softmodem
   -Wl,--start-group
-  RRC_LIB NR_RRC_LIB S1AP_LIB S1AP_ENB F1AP_LIB F1AP M2AP_LIB M2AP_ENB X2AP_LIB X2AP_ENB M3AP_LIB M3AP_ENB ${GTPV1U} SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT MME_APP UDP SCHED_LIB SCHED_RU_LIB 
-  PHY_COMMON PHY PHY_RU LFDS L2 L2_LTE NFAPI_COMMON_LIB NFAPI_LIB NFAPI_VNF_LIB NFAPI_PNF_LIB NFAPI_USER_LIB LFDS7
+  RRC_LIB NR_RRC_LIB S1AP_LIB S1AP_ENB F1AP_LIB F1AP M2AP_LIB M2AP_ENB X2AP_LIB X2AP_ENB M3AP_LIB M3AP_ENB SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT MME_APP UDP SCHED_LIB SCHED_RU_LIB 
+  PHY_COMMON PHY PHY_RU LFDS L2 L2_LTE ${GTPV1U} NFAPI_COMMON_LIB NFAPI_LIB NFAPI_VNF_LIB NFAPI_PNF_LIB NFAPI_USER_LIB LFDS7
   ${MSC_LIB} ${RAL_LIB} ${NAS_UE_LIB} ${ITTI_LIB} ${FLPT_MSG_LIB} ${ASYNC_IF_LIB} ${FLEXRAN_AGENT_LIB} ${FSPT_MSG_LIB} ${PROTO_AGENT_LIB}
   -Wl,--end-group z dl)
   

doc/SW_archi.md

@@ -296,6 +296,28 @@ gtp thread calls directly pdcp_data_req(), so it runs inside it's context intern
 ## inside other threads
 gtpv1u_create_s1u_tunnel(), delete tunnel, ... functions are called inside the other threads, without mutex.
 
+# New GTP
+## initialization
+Coexistance until full merge with legacy GTP
+cmake new option: NEW_GTPU to use the new implementation (it changes for the entire executable)
+It is possible to use both old and new GTP in same executable because the itti task and all functions names are different 
+Current status of new implementation: not tested, X2 not developped, 5G new GTP option not developped, remain issues on data coming from void: muid, enb_flag, ...
+
+ocp_gtpv1uTask(): this creates only the thread, doesn't configure anything
+gtpv1Init(): creates a listening socket to Linux for a given reception and select a local IP address
+
+newGtpuCreateTunnel() this function will replace the xxx_create_tunnel_xxx() for various cases
+This creates a outgoing context for a teid (in input), it computes and return the incoming teid that will be used for incoming packets
+These teids and in a "instance", so in a Linux socket: same teid can co-exist for different sockets
+ Remain here a lack to fill: the information given in the legacy funtions is not enough to fullfil the data needed by the callback
+stuff like enb_flag, but also mui and more important data are not given explicitly by any legacy function (gtpv1u_create_s1u_tunnel), but the legacy and the new interface to lower layer (like pdcp) require this data.
+The datamodel is still not fully understood, so this data source remain unknown
+A new parameter is the callback function: will be pdpcp_data_req() and gtpv_data_req() (x2 case) for existing implementation and later other call backs like the F1-U implementation.
+
+incoming packets
+the gtp layer retrieves the data, the teid, find out the related data: rnti, bearer and quite a lot of other parameters (not clear why, because it looks like all is statefull, so the lower layer should have the context) 
+if lower layers can be stateless, it is a good idea to keep the context in the gtp layer and pass it to the callback, but the design remain obfuscated.
+
 # NGAP
 NGAP would be a itti thread as is S1AP (+twin thread SCTP that is almost void processing)?  
 About all messages are exchanged with RRC thread  

openair2/COMMON/gtpv1_u_messages_types.h

@@ -170,6 +170,8 @@ typedef struct gtpv1u_enb_end_marker_ind_s {
 typedef struct {
   in_addr_t             enb_ip_address_for_S1u_S12_S4_up;
   tcp_udp_port_t        enb_port_for_S1u_S12_S4_up;
+  char addrStr[256];
+  char portStr[256];
 } Gtpv1uS1Req;
 
 #endif /* GTPV1_U_MESSAGES_TYPES_H_ */

openair2/ENB_APP/enb_config.c

@@ -57,6 +57,7 @@
 #include "enb_paramdef.h"
 #include "proto_agent.h"
 #include "executables/thread-common.h"
+#include <openair3/ocp-gtpu/gtp_itf.h>
 
 extern uint32_t to_earfcn_DL(int eutra_bandP, uint32_t dl_CarrierFreq, uint32_t bw);
 extern uint32_t to_earfcn_UL(int eutra_bandP, uint32_t ul_CarrierFreq, uint32_t bw);
@@ -2055,7 +2056,9 @@ int RCconfig_gtpu(void ) {
     IPV4_STR_ADDR_TO_INT_NWBO ( address, GTPV1U_ENB_S1_REQ(message).enb_ip_address_for_S1u_S12_S4_up, "BAD IP ADDRESS FORMAT FOR eNB S1_U !\n" );
     LOG_I(GTPU,"Configuring GTPu address : %s -> %x\n",address,GTPV1U_ENB_S1_REQ(message).enb_ip_address_for_S1u_S12_S4_up);
     GTPV1U_ENB_S1_REQ(message).enb_port_for_S1u_S12_S4_up = enb_port_for_S1U;
-    itti_send_msg_to_task (TASK_GTPV1_U, 0, message); // data model is wrong: gtpu doesn't have enb_id (or module_id)
+    strcpy(GTPV1U_ENB_S1_REQ(message).addrStr,address);
+    sprintf(GTPV1U_ENB_S1_REQ(message).portStr,"%d", enb_port_for_S1U);
+    itti_send_msg_to_task (TASK_VARIABLE, 0, message); // data model is wrong: gtpu doesn't have enb_id (or module_id)
   } else
     LOG_E(GTPU,"invalid address for S1U\n");
 

openair2/GNB_APP/gnb_config.c

@@ -57,6 +57,7 @@
 //#include "RRC_config_tools.h"
 #include "gnb_paramdef.h"
 #include "NR_MAC_gNB/mac_proto.h"
+#include <openair3/ocp-gtpu/gtp_itf.h>
 
 #include "NR_asn_constant.h"
 #include "executables/thread-common.h"
@@ -740,8 +741,9 @@ int RCconfig_nr_gtpu(void ) {
         LOG_I(GTPU,"Configuring GTPu address : %s -> %x\n",address,GTPV1U_ENB_S1_REQ(message).enb_ip_address_for_S1u_S12_S4_up);
         GTPV1U_ENB_S1_REQ(message).enb_port_for_S1u_S12_S4_up = gnb_port_for_NGU;
       }
-
-     itti_send_msg_to_task (TASK_GTPV1_U, 0, message); // data model is wrong: gtpu doesn't have enb_id (or module_id)
+    strcpy(GTPV1U_ENB_S1_REQ(message).addrStr,address);
+    sprintf(GTPV1U_ENB_S1_REQ(message).portStr,"%d", gnb_port_for_NGU);
+     itti_send_msg_to_task (TASK_VARIABLE, 0, message); // data model is wrong: gtpu doesn't have enb_id (or module_id)
     } else
     LOG_E(GTPU,"invalid address for NGU\n");
 

openair2/LAYER2/PDCP_v10.1.0/pdcp.c

@@ -61,6 +61,7 @@
 
 #  include "gtpv1u_eNB_task.h"
 #  include "gtpv1u.h"
+#include <openair3/ocp-gtpu/gtp_itf.h>
 
 #include "ENB_APP/enb_config.h"
 
@@ -937,7 +938,7 @@ pdcp_data_ind(
       GTPV1U_ENB_TUNNEL_DATA_REQ(message_p).offset       = GTPU_HEADER_OVERHEAD_MAX;
       GTPV1U_ENB_TUNNEL_DATA_REQ(message_p).rnti         = ctxt_pP->rnti;
       GTPV1U_ENB_TUNNEL_DATA_REQ(message_p).rab_id       = rb_id + 4;
-      itti_send_msg_to_task(TASK_GTPV1_U, INSTANCE_DEFAULT, message_p);
+      itti_send_msg_to_task(TASK_VARIABLE, INSTANCE_DEFAULT, message_p);
       packet_forwarded = TRUE;
     }
   } else {

openair2/LAYER2/PDCP_v10.1.0/pdcp.h

@@ -242,17 +242,18 @@ typedef struct pdcp_mbms_s {
 * \note None
 * @ingroup _pdcp
 */
+
 boolean_t pdcp_data_req(
   protocol_ctxt_t  *ctxt_pP,
   const srb_flag_t srb_flagP,
   const rb_id_t rb_id,
   const mui_t muiP,
-  const confirm_t confirmP, \
+  const confirm_t confirmP,
   const sdu_size_t sdu_buffer_size,
   unsigned char *const sdu_buffer,
   const pdcp_transmission_mode_t mode,
-  const uint32_t *const sourceL2Id,
-  const uint32_t *const destinationL2Id
+  const uint32_t * sourceL2Id,
+  const uint32_t * destinationL2Id
 );
 
 /*! \fn boolean_t pdcp_data_ind(const protocol_ctxt_t* const, srb_flag_t, MBMS_flag_t, rb_id_t, sdu_size_t, mem_block_t*, boolean_t)

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

@@ -33,6 +33,7 @@
 /* from OAI */
 #include "pdcp.h"
 #include "LAYER2/nr_rlc/nr_rlc_oai_api.h"
+#include <openair3/ocp-gtpu/gtp_itf.h>
 
 #define TODO do { \
     printf("%s:%d:%s: todo\n", __FILE__, __LINE__, __FUNCTION__); \
@@ -442,7 +443,7 @@ static void deliver_sdu_drb(void *_ue, nr_pdcp_entity_t *entity,
       LOG_D(PDCP, "%s() (drb %d) sending message to gtp size %d\n", __func__, rb_id, size);
       //for (i = 0; i < size; i++) printf(" %2.2x", (unsigned char)buf[i]);
       //printf("\n");
-      itti_send_msg_to_task(TASK_GTPV1_U, INSTANCE_DEFAULT, message_p);
+      itti_send_msg_to_task(TASK_VARIABLE, INSTANCE_DEFAULT, message_p);
 
   }
 }

openair2/RRC/LTE/rrc_eNB.c

@@ -5034,7 +5034,7 @@ void rrc_eNB_handover_ue_context_release(
     ue_context_p->ue_context.enb_gtp_ebi[e_rab] = 0;
   }
 
-  itti_send_msg_to_task(TASK_GTPV1_U, ctxt_pP->module_id, msg_delete_tunnels_p);
+  itti_send_msg_to_task(TASK_VARIABLE, ctxt_pP->module_id, msg_delete_tunnels_p);
   struct rrc_ue_s1ap_ids_s *rrc_ue_s1ap_ids = NULL;
   rrc_ue_s1ap_ids = rrc_eNB_S1AP_get_ue_ids(RC.rrc[ctxt_pP->module_id], 0, eNB_ue_s1ap_id);
 

openair2/RRC/LTE/rrc_eNB_S1AP.c

@@ -1763,7 +1763,7 @@ int rrc_eNB_process_S1AP_E_RAB_RELEASE_COMMAND(MessageDef *msg_p, const char *ms
         }
       }
 
-      itti_send_msg_to_task(TASK_GTPV1_U, instance, msg_delete_tunnels_p);
+      itti_send_msg_to_task(TASK_VARIABLE, instance, msg_delete_tunnels_p);
       //S1AP_E_RAB_RELEASE_RESPONSE
       rrc_eNB_send_S1AP_E_RAB_RELEASE_RESPONSE(&ctxt, ue_context_p, xid);
     }

openair2/RRC/NR/rrc_gNB_nsa.c

@@ -39,6 +39,7 @@
 #include "openair2/RRC/LTE/rrc_eNB_GTPV1U.h"
 #include "executables/softmodem-common.h"
 #include <openair2/RRC/NR/rrc_gNB_UE_context.h>
+#include <openair3/ocp-gtpu/gtp_itf.h>
 
 extern boolean_t nr_rrc_pdcp_config_asn1_req(
     const protocol_ctxt_t *const  ctxt_pP,
@@ -341,7 +342,7 @@ void rrc_remove_nsa_user(gNB_RRC_INST *rrc, int rnti) {
     ue_context->ue_context.gnb_gtp_ebi[e_rab] = 0;
   }
 
-  itti_send_msg_to_task(TASK_GTPV1_U, rrc->module_id, msg_delete_tunnels_p);
+  itti_send_msg_to_task(TASK_VARIABLE, rrc->module_id, msg_delete_tunnels_p);
 
   /* remove context */
   rrc_gNB_remove_ue_context(&ctxt, rrc, ue_context);

openair3/ocp-gtpu/gtp_itf.cpp

+#include <map>
+using namespace std;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
@@ -10,9 +16,8 @@
 #include <common/utils/ocp_itti/intertask_interface.h>
 #include <openair2/COMMON/gtpv1_u_messages_types.h>
 #include <openair3/ocp-gtpu/gtp_itf.h>
+#include <openair2/LAYER2/PDCP_v10.1.0/pdcp.h>
 //#include <openair1/PHY/phy_extern.h>
-#include <map>
-using namespace std;
 
 #pragma pack(1)
 
@@ -25,13 +30,13 @@ typedef struct Gtpv1uMsgHeader {
   uint8_t version:3;
   uint8_t msgType;
   uint16_t msgLength;
-  uint32_t teid;
+  teid_t teid;
 } __attribute__((packed)) Gtpv1uMsgHeaderT;
 
 #pragma pack()
 
-  // TS 29.060, table 7.1 defines the possible message types
-  // here are all the possible messages (3GPP R16)
+// TS 29.060, table 7.1 defines the possible message types
+// here are all the possible messages (3GPP R16)
 #define GTP_ECHO_REQ                                         (1)
 #define GTP_ECHO_RSP                                         (2)
 #define GTP_ERROR_INDICATION                                 (26)
@@ -57,11 +62,14 @@ typedef struct {
 
 typedef struct {
   rnti_t rnti;
+  gtpCallback callBack;
 } rntiData_t;
 
 class gtpEndPoint {
  public:
   openAddr_t addr;
+  uint8_t foundAddr[20];
+  int foundAddrLen;
   map<int,teidData_t> ue2te_mapping;
   map<int,rntiData_t> te2ue_mapping;
 };
@@ -75,10 +83,6 @@ class gtpEndPoints {
 
 gtpEndPoints globGtp;
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 static  uint32_t gtpv1uNewTeid(void) {
 #ifdef GTPV1U_LINEAR_TEID_ALLOCATION
   g_gtpv1u_teid = g_gtpv1u_teid + 1;
@@ -90,7 +94,7 @@ static  uint32_t gtpv1uNewTeid(void) {
 
 
 #define GTPV1U_HEADER_SIZE                                  (8)
-static  int gtpv1uCreateAndSendMsg(int h, uint32_t peerIp, uint16_t peerPort, uint32_t teid, uint8_t *Msg,int msgLen,
+static  int gtpv1uCreateAndSendMsg(int h, uint32_t peerIp, uint16_t peerPort, teid_t teid, uint8_t *Msg,int msgLen,
                                    bool seqNumFlag, bool  npduNumFlag, bool extHdrFlag, int seqNum, int npduNum, int extHdrType) {
   AssertFatal(extHdrFlag==false,"Not developped");
   int headerAdditional=0;
@@ -203,6 +207,11 @@ static  int udpServerSocket(openAddr_s addr) {
       close(sockfd);
       LOG_W(GTPU,"bind: %s\n", strerror(errno));
       continue;
+    } else {
+      // We create the gtp instance on the socket
+      globGtp.instances[sockfd].addr=addr;
+      memcpy(globGtp.instances[sockfd].foundAddr, p->ai_addr, p->ai_addrlen);
+      globGtp.instances[sockfd].foundAddrLen=p->ai_addrlen;
     }
 
     break; // if we get here, we must have connected successfully
@@ -215,6 +224,28 @@ static  int udpServerSocket(openAddr_s addr) {
   }
 
   freeaddrinfo(servinfo); // all done with this structure
+
+  if (strlen(addr.destinationHost)>1) {
+    struct addrinfo hints;
+    memset(&hints,0,sizeof(hints));
+    hints.ai_family=AF_UNSPEC;
+    hints.ai_socktype=SOCK_DGRAM;
+    hints.ai_protocol=0;
+    hints.ai_flags=AI_PASSIVE|AI_ADDRCONFIG;
+    struct addrinfo *res=0;
+    int err=getaddrinfo(addr.destinationHost,addr.destinationService,&hints,&res);
+
+    if (err==0) {
+      for(p = res; p != NULL; p = p->ai_next) {
+        if ((err=connect(sockfd,  p->ai_addr, p->ai_addrlen))==0)
+          break;
+      }
+    }
+
+    if (err)
+      LOG_E(GTPU,"Can't filter remote host: %s, %s\n", addr.destinationHost,addr.destinationService);
+  }
+
   int sendbuff = 1000*1000*10;
   AssertFatal(0==setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &sendbuff, sizeof(sendbuff)),"");
   LOG_D(GTPU,"Created listener for paquets to: %s:%s, send buffer size: %d\n", addr.originHost, addr.originService,sendbuff);
@@ -226,36 +257,24 @@ instance_t ocp_gtpv1Init(openAddr_t context) {
   int id=udpServerSocket(context);
 
   if (id>=0) {
-    globGtp.instances[id].addr=context;
     itti_subscribe_event_fd(OCP_GTPV1_U, id);
   } else
     LOG_E(GTPU,"can't create GTP-U instance\n");
 
   pthread_mutex_unlock(&globGtp.gtp_lock);
-
   return id;
 }
 
-int ocp_gtpv1u_create_s1u_tunnel(instance_t instance,
-                                 const gtpv1u_enb_create_tunnel_req_t  *create_tunnel_req,
-                                 gtpv1u_enb_create_tunnel_resp_t *create_tunnel_resp) {
-  LOG_D(GTPU, "Start create tunnels for RNTI %x, num_tunnels %d, sgw_S1u_teid %d\n",
-        create_tunnel_req->rnti,
-        create_tunnel_req->num_tunnels,
-        create_tunnel_req->sgw_S1u_teid[0]);
+teid_t newGtpuCreateTunnel(instance_t instance, rnti_t rnti, int bearer_id, teid_t teid, transport_layer_addr_t remoteAddr, int port, gtpCallback callBack) {
   pthread_mutex_lock(&globGtp.gtp_lock);
   auto inst=&globGtp.instances[instance];
-  auto it=inst->ue2te_mapping.find(create_tunnel_req->rnti);
+  auto it=inst->ue2te_mapping.find(rnti);
 
   if ( it != inst->ue2te_mapping.end() ) {
-    LOG_W(GTPU,"Create a config for a already existing GTP tunnel (rnti %x)\n", create_tunnel_req->rnti);
+    LOG_W(GTPU,"Create a config for a already existing GTP tunnel (rnti %x)\n", rnti);
     inst->ue2te_mapping.erase(it);
   }
 
-  rntiData_t rntiData= {create_tunnel_req->rnti};
-
-  for (int i = 0; i < create_tunnel_req->num_tunnels; i++) {
-    ocp_gtpv1u_bearer_t gtpv1u_ue_data;
   uint32_t s1u_teid=gtpv1uNewTeid();
 
   while ( inst->te2ue_mapping.find(s1u_teid) != inst->te2ue_mapping.end() ) {
@@ -263,76 +282,65 @@ int ocp_gtpv1u_create_s1u_tunnel(instance_t instance,
     s1u_teid=gtpv1uNewTeid();
   };
 
-    inst->te2ue_mapping[s1u_teid]=rntiData;
+  inst->te2ue_mapping[s1u_teid].rnti=rnti;
+
+  inst->te2ue_mapping[s1u_teid].callBack=callBack;
+
+  auto tmp=&inst->ue2te_mapping[rnti].bearers[bearer_id];
 
-    int addrs_length_in_bytes = create_tunnel_req->sgw_addr[i].length / 8;
+  int addrs_length_in_bytes = remoteAddr.length / 8;
 
   switch (addrs_length_in_bytes) {
     case 4:
-        memcpy(&gtpv1u_ue_data.outgoing_ip_addr,create_tunnel_req->sgw_addr[i].buffer,4);
+      memcpy(&tmp->outgoing_ip_addr,remoteAddr.buffer,4);
       break;
 
     case 16:
-        memcpy(&gtpv1u_ue_data.outgoing_ip6_addr.s6_addr,
-               create_tunnel_req->sgw_addr[i].buffer,
+      memcpy(tmp->outgoing_ip6_addr.s6_addr,remoteAddr.buffer,
              16);
       break;
 
     case 20:
-        memcpy(&gtpv1u_ue_data.outgoing_ip_addr,create_tunnel_req->sgw_addr[i].buffer,4);
-        memcpy(&gtpv1u_ue_data.outgoing_ip6_addr.s6_addr,
-               create_tunnel_req->sgw_addr[i].buffer+4,
+      memcpy(&tmp->outgoing_ip_addr,remoteAddr.buffer,4);
+      memcpy(&tmp->outgoing_ip6_addr.s6_addr,
+             remoteAddr.buffer+4,
              16);
 
     default:
       AssertFatal(false, "SGW Address size impossible");
   }
 
-    gtpv1u_ue_data.teid_incoming = s1u_teid;
-    gtpv1u_ue_data.outgoing_port=2152;
-    gtpv1u_ue_data.teid_outgoing= create_tunnel_req->sgw_S1u_teid[i];
-    inst->ue2te_mapping[create_tunnel_req->rnti].bearers[create_tunnel_req->eps_bearer_id[i]]=gtpv1u_ue_data;
-    LOG_D(GTPU, "Created tunnel %x for RNTI %x, SGW: " IPV4_ADDR ":%d\n",
-          s1u_teid, create_tunnel_req->rnti,
-          IPV4_ADDR_FORMAT(inst->ue2te_mapping[create_tunnel_req->rnti].bearers[create_tunnel_req->eps_bearer_id[i]].outgoing_ip_addr),
-          inst->ue2te_mapping[create_tunnel_req->rnti].bearers[create_tunnel_req->eps_bearer_id[i]].outgoing_port );
+  tmp->teid_incoming = s1u_teid;
+  tmp->outgoing_port=port;
+  tmp->teid_outgoing= teid;
+  pthread_mutex_unlock(&globGtp.gtp_lock);
+  return s1u_teid;
+}
+
+int ocp_gtpv1u_create_s1u_tunnel(instance_t instance,
+                                 const gtpv1u_enb_create_tunnel_req_t  *create_tunnel_req,
+                                 gtpv1u_enb_create_tunnel_resp_t *create_tunnel_resp) {
+  LOG_D(GTPU, "Start create tunnels for RNTI %x, num_tunnels %d, sgw_S1u_teid %d\n",
+        create_tunnel_req->rnti,
+        create_tunnel_req->num_tunnels,
+        create_tunnel_req->sgw_S1u_teid[0]);
+
+  for (int i = 0; i < create_tunnel_req->num_tunnels; i++) {
+    teid_t teid=newGtpuCreateTunnel(instance, create_tunnel_req->rnti,
+                                    create_tunnel_req->eps_bearer_id[i],
+                                    create_tunnel_req->eps_bearer_id[i],
+                                    create_tunnel_req->sgw_addr[i], 2152,
+                                    pdcp_data_req);
     create_tunnel_resp->status=0;
     create_tunnel_resp->rnti=create_tunnel_req->rnti;
     create_tunnel_resp->num_tunnels=create_tunnel_req->num_tunnels;
-    create_tunnel_resp->enb_S1u_teid[i]=gtpv1u_ue_data.teid_incoming;
+    create_tunnel_resp->enb_S1u_teid[i]=teid;
     create_tunnel_resp->eps_bearer_id[i] = create_tunnel_req->eps_bearer_id[i];
-    //TBD: fix me this is quite bad, for IPv4 only and
-    // Overcomplex stuff to fill InitialContextSetupResponse in S1AP
-    int status;
-    struct addrinfo hints= {0}, *servinfo, *p;
-    hints.ai_family = AF_UNSPEC;
-    hints.ai_socktype = SOCK_DGRAM;
-    hints.ai_flags = AI_PASSIVE;
-    openAddr_t *addr=&globGtp.instances[instance].addr;
-
-    if ((status = getaddrinfo(addr->originHost, addr->originService, &hints, &servinfo)) != 0) {
-      LOG_E(GTPU,"getaddrinfo error: %s\n", gai_strerror(status));
-      pthread_mutex_unlock(&globGtp.gtp_lock);
-      return -1;
+    memcpy(create_tunnel_resp->enb_addr.buffer,globGtp.instances[instance].foundAddr,
+           globGtp.instances[instance].foundAddrLen);
+    create_tunnel_resp->enb_addr.length= globGtp.instances[instance].foundAddrLen;
   }
 
-    // TBD: we take the first IPv4 addr, but it should be coded in the right way
-    for(p = servinfo; p != NULL; p = p->ai_next)
-      if (p->ai_family == AF_INET) {
-        struct sockaddr_in *ipv4P=(struct sockaddr_in *)p->ai_addr;
-        memcpy(create_tunnel_resp->enb_addr.buffer,
-               &ipv4P->sin_addr.s_addr, sizeof(ipv4P->sin_addr.s_addr));
-        create_tunnel_resp->enb_addr.length = sizeof(ipv4P->sin_addr.s_addr);
-        break;
-      }
-
-    if ( p == NULL )
-      LOG_E(GTPU,"can't translate IP address string: %s\n",addr->originHost);
-
-    freeaddrinfo(servinfo); // all done with this structure
-  }
-
-  pthread_mutex_unlock(&globGtp.gtp_lock);
   return !GTPNOK;
 }
 
@@ -358,9 +366,9 @@ int ocp_gtpv1u_update_s1u_tunnel(
 
   if ( it != inst->ue2te_mapping.end() ) {
     LOG_W(GTPU,"Update a not existing tunnel, start create the new one (new rnti %x, old rnti %x)\n", create_tunnel_req->rnti, prior_rnti);
+    pthread_mutex_unlock(&globGtp.gtp_lock);
     gtpv1u_enb_create_tunnel_resp_t tmp;
     (void)ocp_gtpv1u_create_s1u_tunnel(instance, create_tunnel_req, &tmp);
-    pthread_mutex_unlock(&globGtp.gtp_lock);
     return 0;
   }
 
@@ -372,8 +380,8 @@ int ocp_gtpv1u_update_s1u_tunnel(
 
 int ocp_gtpv1u_create_x2u_tunnel(
   const instance_t instanceP,
-  const gtpv1u_enb_create_x2u_tunnel_req_t *  const create_tunnel_req_pP,
-  gtpv1u_enb_create_x2u_tunnel_resp_t * const create_tunnel_resp_pP){
+  const gtpv1u_enb_create_x2u_tunnel_req_t   *const create_tunnel_req_pP,
+  gtpv1u_enb_create_x2u_tunnel_resp_t *const create_tunnel_resp_pP) {
   AssertFatal( false, "to be developped\n");
 }
 
@@ -433,7 +441,7 @@ static int Gtpv1uHandleSupportedExt(int h,
   return rc;
 }
 
-  static int Gtpv1uHandleEndMarker(int h,
+static int Gtpv1uHandleEndMarker(int h,
                                  uint8_t *msgBuf,
                                  uint32_t msgBufLen,
                                  uint16_t peerPort,
@@ -460,52 +468,52 @@ static int Gtpv1uHandleGpdu(int h,
   auto tunnel=inst->te2ue_mapping.find(ntohl(msgHdr->teid));
 
   if ( tunnel == inst->te2ue_mapping.end() ) {
-    LOG_E(GTPU,"Received a incoming packet on non open teid (%d)\n", msgHdr->teid);
+    LOG_E(GTPU,"Received a incoming packet on unknown teid (%d) Dropping!\n", msgHdr->teid);
     pthread_mutex_unlock(&globGtp.gtp_lock);
     return GTPNOK;
   }
 
   int offset=8;
+
   if( msgHdr->E ||  msgHdr->S ||msgHdr->PN)
     offset+=4;
-  /*
-  gtpv1u_enb_tunnel_data_ind_t tmp;
+
+  // This context is not good for gtp
+  // frame, ... has no meaning
+  // manyother attributes may come from create tunnel
   protocol_ctxt_t ctxt;
   ctxt.module_id = 0;
   ctxt.enb_flag = 1;
-    ctxt.instance = 0;
+  ctxt.instance = inst->addr.originInstance;
+  ctxt.rnti = tunnel->second.rnti;
   ctxt.frame = 0;
   ctxt.subframe = 0;
   ctxt.eNB_index = 0;
   ctxt.configured = 1;
   ctxt.brOption = 0;
-      result = pdcp_data_req(&ctxt,
-                             SRB_FLAG_YES,
-                             RRC_DCCH_DATA_REQ(msg_p).rb_id,
-                             RRC_DCCH_DATA_REQ(msg_p).muip,
-                             RRC_DCCH_DATA_REQ(msg_p).confirmp,
-                             RRC_DCCH_DATA_REQ(msg_p).sdu_size,
-                             RRC_DCCH_DATA_REQ(msg_p).sdu_p,
-                             RRC_DCCH_DATA_REQ(msg_p).mode,
-                             NULL, NULL);
-
-
-    ctxt.rnti = rnti;
-    pdcp_data_req(&ctxt, SRB_FLAG_NO, rb_id, RLC_MUI_UNDEFINED,
-                  RLC_SDU_CONFIRM_NO, len, (unsigned char *)rx_buf,
-                  PDCP_TRANSMISSION_MODE_DATA, NULL, NULL);
-
-  MessageDef *msg_p=itti_alloc_new_message_sized(OCP_GTPV1_U,GTPV1U_ENB_TUNNEL_DATA_IND,
-                    sizeof(MessageDef) + msgBufLen);
-  GTPV1U_ENB_TUNNEL_DATA_IND(msg_p).buffer=(uint8_t *)(msg_p+1);
-  memcpy(GTPV1U_ENB_TUNNEL_DATA_IND(msg_p).buffer,msgBuf,msgBufLen);
-  GTPV1U_ENB_TUNNEL_DATA_IND(msg_p).length=msgBufLen;
-  GTPV1U_ENB_TUNNEL_DATA_IND(msg_p).offset=offset;
+  const srb_flag_t     srb_flag=SRB_FLAG_NO;
+  const rb_id_t        rb_id=0;
+  const mui_t          mui=RLC_MUI_UNDEFINED;
+  const confirm_t      confirm=RLC_SDU_CONFIRM_NO;
+  const sdu_size_t     sdu_buffer_size=msgBufLen-offset;
+  unsigned char *const sdu_buffer=msgBuf+offset;
+  const pdcp_transmission_mode_t mode=PDCP_TRANSMISSION_MODE_DATA;
+  const uint32_t sourceL2Id=0;
+  const uint32_t destinationL2Id=0;
   pthread_mutex_unlock(&globGtp.gtp_lock);
-  inst->addr.dlCallBack(msg_p);
-  */
-  // could be a full itti msg, make it in the call back if you need
-  //itti_send_msg_to_task(TASK_RRC_ENB, ENB_MODULE_ID_TO_INSTANCE(0), msg_p);
+
+  if ( !tunnel->second.callBack(&ctxt,
+                                srb_flag,
+                                rb_id,
+                                mui,
+                                confirm,
+                                sdu_buffer_size,
+                                sdu_buffer,
+                                mode,
+                                &sourceL2Id,
+                                &destinationL2Id) )
+    LOG_E(GTPU,"down layer refused incoming packet\n");
+
   LOG_D(GTPU,"Received a %d bytes packet for: teid:%x\n",
         msgBufLen-offset,
         ntohl(msgHdr->teid));
@@ -561,6 +569,8 @@ void gtpv1uReceiver(int h) {
   }
 }
 
+#include <openair2/ENB_APP/enb_paramdef.h>
+
 void *ocp_gtpv1uTask(void *args)  {
   while(1) {
     /* Trying to fetch a message from the message queue.
@@ -571,6 +581,8 @@ void *ocp_gtpv1uTask(void *args)  {
     itti_receive_msg(OCP_GTPV1_U, &message_p);
 
     if (message_p != NULL ) {
+      openAddr_t addr= {0};
+
       switch (ITTI_MSG_ID(message_p)) {
         // DATA TO BE SENT TO UDP
         case GTPV1U_ENB_TUNNEL_DATA_REQ: {
@@ -587,16 +599,21 @@ void *ocp_gtpv1uTask(void *args)  {
           LOG_E(GTPU, "Received unexpected timer expired (no need of timers in this version) %s\n", ITTI_MSG_NAME(message_p));
           break;
 
-	  
         case GTPV1U_ENB_DATA_FORWARDING_REQ:
         case GTPV1U_ENB_DATA_FORWARDING_IND:
         case GTPV1U_ENB_END_MARKER_REQ:
         case GTPV1U_ENB_END_MARKER_IND:
-      case GTPV1U_ENB_S1_REQ:
           LOG_E(GTPU, "to be developped %s\n", ITTI_MSG_NAME(message_p));
           abort();
           break;
 
+        case GTPV1U_ENB_S1_REQ:
+          // to be dev: should be removed, to use API
+          strcpy(addr.originHost, GTPV1U_ENB_S1_REQ(message_p).addrStr);
+          strcpy(addr.originService, GTPV1U_ENB_S1_REQ(message_p).portStr);
+          AssertFatal(ocp_gtpv1Init(addr),"Only one instance 0 supprted\n");
+          break;
+
         default:
           LOG_E(GTPU, "Received unexpected message %s\n", ITTI_MSG_NAME(message_p));
           abort();

openair3/ocp-gtpu/gtp_itf.h

-#ifndef __UDP_ITF_H__
-#define __UDP_ITF_H__
+#ifndef __GTPUNEW_ITF_H__
+#define __GTPUNEW_ITF_H__
 #define GTPNOK -1
 
 # define GTPU_HEADER_OVERHEAD_MAX 64
@@ -9,11 +9,27 @@ extern "C" {
 
 #include <openair3/GTPV1-U/gtpv1u_eNB_defs.h>
 #if defined(NEW_GTPU)
-  #define gtpv1u_create_s1u_tunnel ocp_gtpv1u_create_s1u_tunnel
-  #define gtpv1u_update_s1u_tunnel ocp_gtpv1u_update_s1u_tunnel
-  #define gtpv1u_delete_s1u_tunnel ocp_gtpv1u_delete_s1u_tunnel
-  #define gtpv1u_create_x2u_tunnel ocp_gtpv1u_create_x2u_tunnel
-  #endif
+#define gtpv1u_create_s1u_tunnel ocp_gtpv1u_create_s1u_tunnel
+#define gtpv1u_update_s1u_tunnel ocp_gtpv1u_update_s1u_tunnel
+#define gtpv1u_delete_s1u_tunnel ocp_gtpv1u_delete_s1u_tunnel
+#define gtpv1u_create_x2u_tunnel ocp_gtpv1u_create_x2u_tunnel
+#define gtpv1u_eNB_task          ocp_gtpv1uTask
+#define TASK_VARIABLE            OCP_GTPV1_U
+#else
+#define TASK_VARIABLE            TASK_GTPV1_U
+#endif
+
+typedef boolean_t (*gtpCallback)(
+  protocol_ctxt_t  *ctxt_pP,
+  const srb_flag_t     srb_flagP,
+  const rb_id_t        rb_idP,
+  const mui_t          muiP,
+  const confirm_t      confirmP,
+  const sdu_size_t     sdu_buffer_sizeP,
+  unsigned char *const sdu_buffer_pP,
+  const pdcp_transmission_mode_t modeP,
+  const uint32_t *sourceL2Id,
+  const uint32_t *destinationL2Id);
 
 typedef struct openAddr_s {
   char originHost[HOST_NAME_MAX];
@@ -25,7 +41,6 @@ typedef struct openAddr_s {
 
 // the init function create a gtp instance and return the gtp instance id
 // the parameter originInstance will be sent back in each message from gtp to the creator
-instance_t ocp_gtpv1Init(openAddr_t context);
 void ocp_gtpv1uReceiver(int h);
 void ocp_gtpv1uProcessTimeout(int handle,void *arg);
 int ocp_gtpv1u_create_s1u_tunnel(const instance_t instance, const gtpv1u_enb_create_tunnel_req_t  *create_tunnel_req,
@@ -37,11 +52,17 @@ int ocp_gtpv1u_update_s1u_tunnel(const instance_t instanceP,
 int ocp_gtpv1u_delete_s1u_tunnel( const instance_t instance, const gtpv1u_enb_delete_tunnel_req_t *const req_pP);
 int gtpv1u_delete_s1u_tunnel( const instance_t instance, const gtpv1u_enb_delete_tunnel_req_t *const req_pP);
 
-  int ocp_gtpv1u_create_x2u_tunnel(
+int ocp_gtpv1u_create_x2u_tunnel(
   const instance_t instanceP,
-  const gtpv1u_enb_create_x2u_tunnel_req_t *  const create_tunnel_req_pP,
-        gtpv1u_enb_create_x2u_tunnel_resp_t * const create_tunnel_resp_pP);
-  void *ocp_gtpv1uTask(void *args);
+  const gtpv1u_enb_create_x2u_tunnel_req_t   *const create_tunnel_req_pP,
+  gtpv1u_enb_create_x2u_tunnel_resp_t *const create_tunnel_resp_pP);
+
+
+// New API
+teid_t newGtpuCreateTunnel(instance_t instance, rnti_t rnti, int bearer_id, teid_t teid,
+                           transport_layer_addr_t remoteAddr, int port, gtpCallback callBack);
+instance_t ocp_gtpv1Init(openAddr_t context);
+void *ocp_gtpv1uTask(void *args);
 
 #ifdef __cplusplus
 }