X2AP: init funcs (register/association) + handler/management functions

SCTP: one to many sockets implementation

cmake_targets/CMakeLists.txt

@@ -474,15 +474,15 @@ add_library(X2AP_LIB
 include_directories ("${X2AP_C_DIR}")
 include_directories ("${X2AP_DIR}")
 
-#add_library(X2AP_ENB
- # ${X2AP_DIR}/x2ap_eNB.c
+add_library(X2AP_ENB
+  ${X2AP_DIR}/x2ap_eNB.c
  # ${X2AP_DIR}/x2ap_eNB_decoder.c
  # ${X2AP_DIR}/x2ap_eNB_encoder.c
- # ${X2AP_DIR}/x2ap_eNB_handler.c
+  ${X2AP_DIR}/x2ap_eNB_handler.c
  # ${X2AP_DIR}/x2ap_eNB_itti_messaging.c
- # ${X2AP_DIR}/x2ap_eNB_management_procedures.c
+  ${X2AP_DIR}/x2ap_eNB_management_procedures.c
  # ${X2AP_DIR}/x2ap_eNB_generate_messages.c
- # )
+ )
 
 # Hardware dependant options
 ###################################
@@ -1947,7 +1947,7 @@ add_executable(lte-softmodem
 
 target_link_libraries (lte-softmodem
   -Wl,--start-group
-  RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB GTPV1U SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB SCHED_RU_LIB PHY_COMMON PHY PHY_RU LFDS L2
+  RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB X2AP_ENB GTPV1U SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB SCHED_RU_LIB PHY_COMMON PHY PHY_RU LFDS L2
   ${MSC_LIB} ${RAL_LIB} ${NAS_UE_LIB} ${ITTI_LIB} ${FLPT_MSG_LIB} ${ASYNC_IF_LIB} ${FLEXRAN_AGENT_LIB} LFDS7
   NFAPI_COMMON_LIB NFAPI_LIB NFAPI_VNF_LIB NFAPI_PNF_LIB NFAPI_USER_LIB
   -Wl,--end-group z dl)
@@ -2023,7 +2023,7 @@ add_executable(lte-uesoftmodem
 
 target_link_libraries (lte-uesoftmodem
   -Wl,--start-group
-  RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB GTPV1U SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT UDP SCHED_RU_LIB SCHED_UE_LIB PHY_COMMON PHY_UE PHY_RU LFDS L2_UE SIMU
+  RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB X2AP_ENB GTPV1U SECU_CN SECU_OSA UTIL HASHTABLE SCTP_CLIENT UDP SCHED_RU_LIB SCHED_UE_LIB PHY_COMMON PHY_UE PHY_RU LFDS L2_UE SIMU
   ${MSC_LIB} ${RAL_LIB} ${NAS_UE_LIB} ${ITTI_LIB} ${FLPT_MSG_LIB} ${ASYNC_IF_LIB} LFDS7 ${ATLAS_LIBRARIES}
   NFAPI_COMMON_LIB NFAPI_LIB NFAPI_PNF_LIB NFAPI_USER_LIB
   -Wl,--end-group z dl)
@@ -2140,7 +2140,7 @@ add_executable(test_epc_generate_scenario
   ${OPENAIR3_DIR}/S1AP/s1ap_eNB_defs.h
   )
 target_link_libraries (test_epc_generate_scenario
-  -Wl,--start-group RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB GTPV1U LIB_NAS_UE SECU_CN UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB PHY LFDS ${ITTI_LIB} ${MSC_LIB} L2 -Wl,--end-group pthread m rt crypt sctp ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${CRYPTO_LIBRARIES} ${OPENSSL_LIBRARIES} ${NETTLE_LIBRARIES} ${CONFIG_LIBRARIES}
+  -Wl,--start-group RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB X2AP_ENB GTPV1U LIB_NAS_UE SECU_CN UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB PHY LFDS ${ITTI_LIB} ${MSC_LIB} L2 -Wl,--end-group pthread m rt crypt sctp ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${CRYPTO_LIBRARIES} ${OPENSSL_LIBRARIES} ${NETTLE_LIBRARIES} ${CONFIG_LIBRARIES}
   )
 
 add_executable(test_epc_play_scenario
@@ -2160,7 +2160,7 @@ add_executable(test_epc_play_scenario
   )
 target_include_directories(test_epc_play_scenario PUBLIC /usr/local/share/asn1c)
 target_link_libraries (test_epc_play_scenario
-  -Wl,--start-group RRC_LIB S1AP_LIB X2AP_LIB GTPV1U LIB_NAS_UE SECU_CN UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB PHY_COMMON PHY PHY_UE LFDS ${ITTI_LIB} ${MSC_LIB} -Wl,--end-group pthread m rt crypt sctp ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${CRYPTO_LIBRARIES} ${OPENSSL_LIBRARIES} ${NETTLE_LIBRARIES} ${CONFIG_LIBRARIES}
+  -Wl,--start-group RRC_LIB S1AP_LIB X2AP_LIB X2AP_ENB GTPV1U LIB_NAS_UE SECU_CN UTIL HASHTABLE SCTP_CLIENT UDP SCHED_LIB PHY_COMMON PHY PHY_UE LFDS ${ITTI_LIB} ${MSC_LIB} -Wl,--end-group pthread m rt crypt sctp ${LIBXML2_LIBRARIES} ${LIBXSLT_LIBRARIES} ${CRYPTO_LIBRARIES} ${OPENSSL_LIBRARIES} ${NETTLE_LIBRARIES} ${CONFIG_LIBRARIES}
   )
 
 
@@ -2196,7 +2196,7 @@ if (${T_TRACER})
         dlsim_tm4 dlsim dlsim_tm7 ulsim pbchsim scansim mbmssim
         pdcchsim pucchsim prachsim syncsim ulsim
         #all "add_library" definitions
-        ITTI RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB
+        ITTI RRC_LIB S1AP_LIB S1AP_ENB X2AP_LIB X2AP_ENB
         oai_exmimodevif oai_usrpdevif oai_bladerfdevif oai_lmssdrdevif
         oai_eth_transpro
         FLPT_MSG ASYNC_IF FLEXRAN_AGENT HASHTABLE MSC UTIL OMG_SUMO SECU_OSA

openair2/COMMON/sctp_messages_def.h

@@ -19,11 +19,13 @@
  *      contact@openairinterface.org
  */
 
-MESSAGE_DEF(SCTP_NEW_ASSOCIATION_REQ , MESSAGE_PRIORITY_MED, sctp_new_association_req_t          , sctp_new_association_req)
-MESSAGE_DEF(SCTP_NEW_ASSOCIATION_RESP, MESSAGE_PRIORITY_MED, sctp_new_association_resp_t         , sctp_new_association_resp)
-MESSAGE_DEF(SCTP_NEW_ASSOCIATION_IND , MESSAGE_PRIORITY_MED, sctp_new_association_ind_t          , sctp_new_association_ind)
-MESSAGE_DEF(SCTP_REGISTER_UPPER_LAYER, MESSAGE_PRIORITY_MED, sctp_listener_register_upper_layer_t, sctp_listener_register_upper_layer)
-MESSAGE_DEF(SCTP_DATA_REQ,             MESSAGE_PRIORITY_MED, sctp_data_req_t                     , sctp_data_req)
-MESSAGE_DEF(SCTP_DATA_IND,             MESSAGE_PRIORITY_MED, sctp_data_ind_t                     , sctp_data_ind)
-MESSAGE_DEF(SCTP_INIT_MSG,             MESSAGE_PRIORITY_MED, sctp_init_t                         , sctp_init)
-MESSAGE_DEF(SCTP_CLOSE_ASSOCIATION,    MESSAGE_PRIORITY_MAX, sctp_close_association_t            , sctp_close_association)
+MESSAGE_DEF(SCTP_NEW_ASSOCIATION_REQ ,      MESSAGE_PRIORITY_MED, sctp_new_association_req_t          , sctp_new_association_req)
+MESSAGE_DEF(SCTP_NEW_ASSOCIATION_REQ_MULTI, MESSAGE_PRIORITY_MED, sctp_new_association_req_t          , sctp_new_association_req_multi)
+MESSAGE_DEF(SCTP_NEW_ASSOCIATION_RESP,      MESSAGE_PRIORITY_MED, sctp_new_association_resp_t         , sctp_new_association_resp)
+MESSAGE_DEF(SCTP_NEW_ASSOCIATION_IND ,      MESSAGE_PRIORITY_MED, sctp_new_association_ind_t          , sctp_new_association_ind)
+MESSAGE_DEF(SCTP_REGISTER_UPPER_LAYER,      MESSAGE_PRIORITY_MED, sctp_listener_register_upper_layer_t, sctp_listener_register_upper_layer)
+MESSAGE_DEF(SCTP_DATA_REQ,                  MESSAGE_PRIORITY_MED, sctp_data_req_t                     , sctp_data_req)
+MESSAGE_DEF(SCTP_DATA_IND,                  MESSAGE_PRIORITY_MED, sctp_data_ind_t                     , sctp_data_ind)
+MESSAGE_DEF(SCTP_INIT_MSG,                  MESSAGE_PRIORITY_MED, sctp_init_t                         , sctp_init)
+MESSAGE_DEF(SCTP_INIT_MSG_MULTI,            MESSAGE_PRIORITY_MED, sctp_init_t                         , sctp_init_multi)
+MESSAGE_DEF(SCTP_CLOSE_ASSOCIATION,         MESSAGE_PRIORITY_MAX, sctp_close_association_t            , sctp_close_association)

openair2/COMMON/sctp_messages_types.h

@@ -22,13 +22,15 @@
 #ifndef SCTP_MESSAGES_TYPES_H_
 #define SCTP_MESSAGES_TYPES_H_
 
-#define SCTP_NEW_ASSOCIATION_REQ(mSGpTR) (mSGpTR)->ittiMsg.sctp_new_association_req
-#define SCTP_NEW_ASSOCIATION_RESP(mSGpTR)(mSGpTR)->ittiMsg.sctp_new_association_resp
-#define SCTP_NEW_ASSOCIATION_IND(mSGpTR) (mSGpTR)->ittiMsg.sctp_new_association_ind
-#define SCTP_DATA_IND(mSGpTR)            (mSGpTR)->ittiMsg.sctp_data_ind
-#define SCTP_DATA_REQ(mSGpTR)            (mSGpTR)->ittiMsg.sctp_data_req
-#define SCTP_INIT_MSG(mSGpTR)            (mSGpTR)->ittiMsg.sctp_init
-#define SCTP_CLOSE_ASSOCIATION(mSGpTR)   (mSGpTR)->ittiMsg.sctp_close_association
+#define SCTP_NEW_ASSOCIATION_REQ(mSGpTR)       (mSGpTR)->ittiMsg.sctp_new_association_req
+#define SCTP_NEW_ASSOCIATION_REQ_MULTI(mSGpTR) (mSGpTR)->ittiMsg.sctp_new_association_req_multi
+#define SCTP_NEW_ASSOCIATION_RESP(mSGpTR)      (mSGpTR)->ittiMsg.sctp_new_association_resp
+#define SCTP_NEW_ASSOCIATION_IND(mSGpTR)       (mSGpTR)->ittiMsg.sctp_new_association_ind
+#define SCTP_DATA_IND(mSGpTR)                  (mSGpTR)->ittiMsg.sctp_data_ind
+#define SCTP_DATA_REQ(mSGpTR)                  (mSGpTR)->ittiMsg.sctp_data_req
+#define SCTP_INIT_MSG(mSGpTR)                  (mSGpTR)->ittiMsg.sctp_init
+#define SCTP_INIT_MSG_MULTI(mSGpTR)            (mSGpTR)->ittiMsg.sctp_init_multi
+#define SCTP_CLOSE_ASSOCIATION(mSGpTR)         (mSGpTR)->ittiMsg.sctp_close_association
 
 enum sctp_state_e {
   SCTP_STATE_CLOSED,

openair2/ENB_APP/enb_app.c

@@ -46,7 +46,7 @@
 #   include "gtpv1u_eNB_task.h"
 # endif
 
-//#   include "x2ap_eNB.h"
+#   include "x2ap_eNB.h"
 #   include "x2ap_messages_types.h"
 #   define X2AP_ENB_REGISTER_RETRY_DELAY   10
 
@@ -154,7 +154,7 @@ static uint32_t eNB_app_register_x2(uint32_t enb_id_start, uint32_t enb_id_end)
 
       RCconfig_X2(msg_p, enb_id);
 
-	//itti_send_msg_to_task (TASK_X2AP, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
+      itti_send_msg_to_task (TASK_X2AP, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
 
       register_enb_x2_pending++;
     }
@@ -176,8 +176,8 @@ void *eNB_app_task(void *args_p)
   long                            enb_register_retry_timer_id;
 # endif
   uint32_t                        x2_register_enb_pending;
-  //uint32_t                        x2_registered_enb;
-  //long                            x2_enb_register_retry_timer_id;
+  uint32_t                        x2_registered_enb;
+  long                            x2_enb_register_retry_timer_id;
   uint32_t                        enb_id;
   MessageDef                     *msg_p           = NULL;
   instance_t                      instance;
@@ -224,7 +224,7 @@ void *eNB_app_task(void *args_p)
 # endif
 
   /* Try to register each eNB with each other */
- // x2_registered_enb = 0;
+  x2_registered_enb = 0;
   x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
 
   do {
@@ -301,8 +301,59 @@ void *eNB_app_task(void *args_p)
         register_enb_pending = eNB_app_register (enb_id_start, enb_id_end);//, enb_properties_p);
       }
 
+      if (TIMER_HAS_EXPIRED (msg_p).timer_id == x2_enb_register_retry_timer_id) {
+        /* Restart the registration process */
+	x2_registered_enb = 0;
+        x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
+      }
+
       break;
 # endif
+    case X2AP_DEREGISTERED_ENB_IND:
+      LOG_W(ENB_APP, "[eNB %d] Received %s: associated eNB %d\n", instance, ITTI_MSG_NAME (msg_p),
+            X2AP_DEREGISTERED_ENB_IND(msg_p).nb_x2);
+
+      /* TODO handle recovering of registration */
+      break;
+
+    case X2AP_REGISTER_ENB_CNF:
+      LOG_I(ENB_APP, "[eNB %d] Received %s: associated eNB %d\n", instance, ITTI_MSG_NAME (msg_p),
+            X2AP_REGISTER_ENB_CNF(msg_p).nb_x2);
+
+      DevAssert(x2_register_enb_pending > 0);
+      x2_register_enb_pending--;
+
+      /* Check if at least eNB is registered with one target eNB */
+      if (X2AP_REGISTER_ENB_CNF(msg_p).nb_x2 > 0) {
+        x2_registered_enb++;
+      }
+
+      /* Check if all register eNB requests have been processed */
+      if (x2_register_enb_pending == 0) {
+        if (x2_registered_enb == enb_nb) {
+          /* If all eNB are registered, start RRC HO task */
+
+	}else {
+          uint32_t x2_not_associated = enb_nb - x2_registered_enb;
+
+          LOG_W(ENB_APP, " %d eNB %s not associated with the target\n",
+                x2_not_associated, x2_not_associated > 1 ? "are" : "is");
+	  // timer to retry
+	  /* Restart the eNB registration process in ENB_REGISTER_RETRY_DELAY seconds */
+          if (timer_setup (X2AP_ENB_REGISTER_RETRY_DELAY, 0, TASK_ENB_APP,
+			   INSTANCE_DEFAULT, TIMER_ONE_SHOT, NULL,
+			   &x2_enb_register_retry_timer_id) < 0) {
+            LOG_E(ENB_APP, " Can not start eNB X2AP register: retry timer, use \"sleep\" instead!\n");
+
+            sleep(X2AP_ENB_REGISTER_RETRY_DELAY);
+            /* Restart the registration process */
+            x2_registered_enb = 0;
+            x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
+          }
+        }
+      }
+
+      break;
 
     default:
       LOG_E(ENB_APP, "Received unexpected message %s\n", ITTI_MSG_NAME (msg_p));

openair2/X2AP/x2ap_common.h

@@ -62,10 +62,12 @@ extern int asn1_xer_print;
 
 #if defined(ENB_MODE)
 # include "log.h"
+# define X2AP_INFO(x, args...) LOG_I(X2AP, x, ##args)
 # define X2AP_ERROR(x, args...) LOG_E(X2AP, x, ##args)
 # define X2AP_WARN(x, args...)  LOG_W(X2AP, x, ##args)
 # define X2AP_DEBUG(x, args...) LOG_D(X2AP, x, ##args)
 #else
+# define X2AP_INFO(x, args...) do { fprintf(stdout, "[X2AP][I]"x, ##args); } while(0)
 # define X2AP_ERROR(x, args...) do { fprintf(stdout, "[X2AP][E]"x, ##args); } while(0)
 # define X2AP_WARN(x, args...)  do { fprintf(stdout, "[X2AP][W]"x, ##args); } while(0)
 # define X2AP_DEBUG(x, args...) do { fprintf(stdout, "[X2AP][D]"x, ##args); } while(0)

openair2/X2AP/x2ap.h → openair2/X2AP/x2ap_eNB.h

@@ -30,10 +30,12 @@
 #ifndef X2AP_H_
 #define X2AP_H_
 
-typedef struct x2ap_config_s {
-} x2ap_config_t;
+#define X2AP_SCTP_PPID   (27)    ///< X2AP SCTP Payload Protocol Identifier (PPID)
+#include "x2ap_eNB_defs.h"
 
-extern x2ap_config_t x2ap_config;
+int x2ap_eNB_init_sctp (x2ap_eNB_instance_t *instance_p,
+                        net_ip_address_t    *local_ip_addr,
+                        uint32_t enb_port_for_X2C);
 
 void *x2ap_task(void *arg);
 

openair2/X2AP/x2ap_eNB_defs.h

+/*
+ * 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 1.1  (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
+ */
+
+#include <stdint.h>
+
+#include "queue.h"
+#include "tree.h"
+
+#include "sctp_eNB_defs.h"
+
+#ifndef X2AP_ENB_DEFS_H_
+#define X2AP_ENB_DEFS_H_
+
+#define X2AP_ENB_NAME_LENGTH_MAX    (150)
+
+typedef enum {
+  /* Disconnected state: initial state for any association. */
+  X2AP_ENB_STATE_DISCONNECTED = 0x0,
+  
+  /* State waiting for x2 Setup response message if the target eNB accepts or
+   * X2 Setup failure if rejects the eNB.
+   */
+  X2AP_ENB_STATE_WAITING     = 0x1,
+  
+  /* The eNB is successfully connected to another eNB. */
+  X2AP_ENB_STATE_CONNECTED   = 0x2,
+  
+  /* X2AP is ready, and the eNB is successfully connected to another eNB. */
+  X2AP_ENB_STATE_READY             = 0x3,
+
+  X2AP_ENB_STATE_OVERLOAD          = 0x4,
+
+  X2AP_ENB_STATE_RESETTING         = 0x5,
+  
+  /* Max number of states available */
+  X2AP_ENB_STATE_MAX,
+} x2ap_eNB_state_t;
+
+
+/* Served PLMN identity element */
+struct plmn_identity_s {
+  uint16_t mcc;
+  uint16_t mnc;
+  uint8_t  mnc_digit_length;
+  STAILQ_ENTRY(plmn_identity_s) next;
+};
+
+/* Served group id element */
+struct served_group_id_s {
+  uint16_t enb_group_id;
+  STAILQ_ENTRY(served_group_id_s) next;
+};
+
+/* Served enn code for a particular eNB */
+struct enb_code_s {
+  uint8_t enb_code;
+  STAILQ_ENTRY(enb_code_s) next;
+};
+
+struct x2ap_eNB_instance_s;
+
+/* This structure describes association of a eNB to another eNB */
+typedef struct x2ap_eNB_data_s {
+  /* eNB descriptors tree, ordered by sctp assoc id */
+  RB_ENTRY(x2ap_eNB_data_s) entry;
+
+  /* This is the optional name provided by the MME */
+  char *eNB_name;
+  
+  /*  target eNB ID */ 
+  uint32_t eNB_id;
+  
+  /* Current eNB load information (if any). */
+  //x2ap_load_state_t overload_state;
+  
+  /* Current eNB->eNB X2AP association state */
+  x2ap_eNB_state_t state;
+
+  /* Next usable stream for UE signalling */
+  int32_t nextstream;
+
+  /* Number of input/ouput streams */
+  uint16_t in_streams;
+  uint16_t out_streams;
+
+  /* Connexion id used between SCTP/X2AP */
+  uint16_t cnx_id;
+
+  /* SCTP association id */
+  int32_t  assoc_id;
+
+  /* Only meaningfull in virtual mode */
+  struct x2ap_eNB_instance_s *x2ap_eNB_instance;
+} x2ap_eNB_data_t;
+
+typedef struct x2ap_eNB_instance_s {
+  /* used in simulation to store multiple eNB instances*/
+  STAILQ_ENTRY(x2ap_eNB_instance_s) x2ap_eNB_entries;
+
+  /* Number of target eNBs requested by eNB (tree size) */
+  uint32_t x2_target_enb_nb;
+  /* Number of target eNBs for which association is pending */
+  uint32_t x2_target_enb_pending_nb;
+  /* Number of target eNB successfully associated to eNB */
+  uint32_t x2_target_enb_associated_nb;
+  /* Tree of X2AP eNB associations ordered by association ID */
+  RB_HEAD(x2ap_enb_map, x2ap_eNB_data_s) x2ap_enb_head;
+
+  /* Tree of UE ordered by eNB_ue_x2ap_id's */
+  //  RB_HEAD(x2ap_ue_map, x2ap_eNB_ue_context_s) x2ap_ue_head;
+
+  /* For virtual mode, mod_id as defined in the rest of the L1/L2 stack */
+  instance_t instance;
+
+  /* Displayable name of eNB */
+  char *eNB_name;
+
+  /* Unique eNB_id to identify the eNB within EPC.
+   * In our case the eNB is a macro eNB so the id will be 20 bits long.
+   * For Home eNB id, this field should be 28 bits long.
+   */
+  uint32_t eNB_id;
+  /* The type of the cell */
+  cell_type_t cell_type;
+
+  /* Tracking area code */
+  uint16_t tac;
+
+  /* Mobile Country Code
+   * Mobile Network Code
+   */
+  uint16_t  mcc;
+  uint16_t  mnc;
+  uint8_t   mnc_digit_length;
+
+ 
+} x2ap_eNB_instance_t;
+
+typedef struct {
+  /* List of served eNBs
+   * Only used for virtual mode
+   */
+  STAILQ_HEAD(x2ap_eNB_instances_head_s, x2ap_eNB_instance_s) x2ap_eNB_instances_head;
+  /* Nb of registered eNBs */
+  uint8_t nb_registered_eNBs;
+
+  /* Generate a unique connexion id used between X2AP and SCTP */
+  uint16_t global_cnx_id;
+} x2ap_eNB_internal_data_t;
+
+int x2ap_eNB_compare_assoc_id(struct x2ap_eNB_data_s *p1, struct x2ap_eNB_data_s *p2);
+
+/* Generate the tree management functions */
+struct x2ap_eNB_map;
+struct x2ap_eNB_data_s;
+RB_PROTOTYPE(x2ap_eNB_map, x2ap_eNB_data_s, entry, x2ap_eNB_compare_assoc_id);
+
+
+#endif /* X2AP_ENB_DEFS_H_ */
+

openair2/X2AP/x2ap_eNB_handler.c

+/*
+ * 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 1.1  (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
+ */
+#include <stdint.h>
+
+#include "intertask_interface.h"
+
+#include "asn1_conversions.h"
+
+#include "x2ap_common.h"
+#include "x2ap_eNB_defs.h"
+#include "x2ap_eNB_handler.h"
+
+#include "x2ap_eNB_management_procedures.h"
+
+#include "assertions.h"
+#include "conversions.h"
+
+void x2ap_handle_x2_setup_message(x2ap_eNB_data_t *enb_desc_p, int sctp_shutdown)
+{
+  if (sctp_shutdown) {
+    /* A previously connected eNB has been shutdown */
+
+    /* TODO check if it was used by some eNB and send a message to inform these eNB if there is no more associated eNB */
+    if (enb_desc_p->state == X2AP_ENB_STATE_CONNECTED) {
+      enb_desc_p->state = X2AP_ENB_STATE_DISCONNECTED;
+
+      if (enb_desc_p->x2ap_eNB_instance-> x2_target_enb_associated_nb > 0) {
+        /* Decrease associated eNB number */
+        enb_desc_p->x2ap_eNB_instance-> x2_target_enb_associated_nb --;
+      }
+
+      /* If there are no more associated eNB, inform eNB app */
+      if (enb_desc_p->x2ap_eNB_instance->x2_target_enb_associated_nb == 0) {
+        MessageDef                 *message_p;
+
+        message_p = itti_alloc_new_message(TASK_X2AP, X2AP_DEREGISTERED_ENB_IND);
+        X2AP_DEREGISTERED_ENB_IND(message_p).nb_x2 = 0;
+        itti_send_msg_to_task(TASK_ENB_APP, enb_desc_p->x2ap_eNB_instance->instance, message_p);
+      }
+    }
+  } else {
+    /* Check that at least one setup message is pending */
+    DevCheck(enb_desc_p->x2ap_eNB_instance->x2_target_enb_pending_nb > 0,
+             enb_desc_p->x2ap_eNB_instance->instance,
+             enb_desc_p->x2ap_eNB_instance->x2_target_enb_pending_nb, 0);
+
+    if (enb_desc_p->x2ap_eNB_instance->x2_target_enb_pending_nb > 0) {
+      /* Decrease pending messages number */
+      enb_desc_p->x2ap_eNB_instance->x2_target_enb_pending_nb --;
+    }
+
+    /* If there are no more pending messages, inform eNB app */
+    if (enb_desc_p->x2ap_eNB_instance->x2_target_enb_pending_nb == 0) {
+      MessageDef                 *message_p;
+
+      message_p = itti_alloc_new_message(TASK_X2AP, X2AP_REGISTER_ENB_CNF);
+      X2AP_REGISTER_ENB_CNF(message_p).nb_x2 = enb_desc_p->x2ap_eNB_instance->x2_target_enb_associated_nb;
+      itti_send_msg_to_task(TASK_ENB_APP, enb_desc_p->x2ap_eNB_instance->instance, message_p);
+    }
+  }
+}

openair2/X2AP/x2ap_eNB_handler.h

+/*
+ * 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 1.1  (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
+ */
+
+#ifndef X2AP_ENB_HANDLERS_H_
+#define X2AP_ENB_HANDLERS_H_
+
+#include "x2ap_eNB_defs.h"
+
+void x2ap_handle_x2_setup_message(x2ap_eNB_data_t *mme_desc_p, int sctp_shutdown);
+
+//int x2ap_eNB_handle_message(uint32_t assoc_id, int32_t stream,
+  //                          const uint8_t * const data, const uint32_t data_length);
+
+#endif /* X2AP_ENB_HANDLERS_H_ */
+

openair2/X2AP/x2ap_eNB_management_procedures.c

+/*
+ * 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 1.1  (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
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "intertask_interface.h"
+
+#include "assertions.h"
+#include "conversions.h"
+
+#include "x2ap_common.h"
+#include "x2ap_eNB_defs.h"
+#include "x2ap_eNB.h"
+
+
+#define X2AP_DEBUG_LIST
+#ifdef X2AP_DEBUG_LIST
+#  define X2AP_eNB_LIST_OUT(x, args...) X2AP_DEBUG("[eNB]%*s"x"\n", 4*indent, "", ##args)
+#else
+#  define X2AP_eNB_LIST_OUT(x, args...)
+#endif 
+
+static int                  indent = 0;
+
+
+x2ap_eNB_internal_data_t x2ap_eNB_internal_data;
+
+RB_GENERATE(x2ap_enb_map, x2ap_eNB_data_s, entry, x2ap_eNB_compare_assoc_id);
+
+int x2ap_eNB_compare_assoc_id(
+  struct x2ap_eNB_data_s *p1, struct x2ap_eNB_data_s *p2)
+{
+  if (p1->assoc_id == -1) {
+    if (p1->cnx_id < p2->cnx_id) {
+      return -1;
+    }
+
+    if (p1->cnx_id > p2->cnx_id) {
+      return 1;
+    }
+  } else {
+    if (p1->assoc_id < p2->assoc_id) {
+      return -1;
+    }
+
+    if (p1->assoc_id > p2->assoc_id) {
+      return 1;
+    }
+  }
+
+  /* Matching reference */
+  return 0;
+}
+
+uint16_t x2ap_eNB_fetch_add_global_cnx_id(void)
+{
+  return ++x2ap_eNB_internal_data.global_cnx_id;
+}
+
+void x2ap_eNB_prepare_internal_data(void)
+{
+  memset(&x2ap_eNB_internal_data, 0, sizeof(x2ap_eNB_internal_data));
+  STAILQ_INIT(&x2ap_eNB_internal_data.x2ap_eNB_instances_head);
+}
+
+void x2ap_eNB_insert_new_instance(x2ap_eNB_instance_t *new_instance_p)
+{
+  DevAssert(new_instance_p != NULL);
+
+  STAILQ_INSERT_TAIL(&x2ap_eNB_internal_data.x2ap_eNB_instances_head,
+                     new_instance_p, x2ap_eNB_entries);
+}
+
+void dump_tree(x2ap_eNB_data_t *t)
+{
+  if (t == NULL) return;
+  printf("-----------------------\n");
+  printf("eNB id %d %s\n", t->eNB_id, t->eNB_name);
+  printf("state %d\n", t->state);
+  printf("nextstream %d\n", t->nextstream);
+  printf("in_streams %d out_streams %d\n", t->in_streams, t->out_streams);
+  printf("cnx_id %d assoc_id %d\n", t->cnx_id, t->assoc_id);
+  dump_tree(t->entry.rbe_left);
+  dump_tree(t->entry.rbe_right);
+}
+
+void dump_trees(void)
+{
+x2ap_eNB_instance_t *zz;
+STAILQ_FOREACH(zz, &x2ap_eNB_internal_data.x2ap_eNB_instances_head,
+               x2ap_eNB_entries) {
+printf("here comes the tree (instance %d):\n---------------------------------------------\n", zz->instance);
+dump_tree(zz->x2ap_enb_head.rbh_root);
+printf("---------------------------------------------\n");
+}
+}
+
+struct x2ap_eNB_data_s *x2ap_get_eNB(x2ap_eNB_instance_t *instance_p,