/******************************************************************************* OpenAirInterface Copyright(c) 1999 - 2014 Eurecom OpenAirInterface is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. OpenAirInterface is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenAirInterface.The full GNU General Public License is included in this distribution in the file called "COPYING". If not, see . Contact Information OpenAirInterface Admin: openair_admin@eurecom.fr OpenAirInterface Tech : openair_tech@eurecom.fr OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE *******************************************************************************/ /*! \file x2ap_eNB.c * \brief x2ap protocol for eNB * \author Navid Nikaein * \date 2014 - 2015 * \version 1.0 * \company Eurecom * \email: navid.nikaein@eurecom.fr */ #include #include #include #include #include #include "intertask_interface.h" #include "assertions.h" #include "queue.h" #include "x2ap_eNB.h" #include "x2ap_eNB_defs.h" #include "x2ap_eNB_decoder.h" #include "x2ap_eNB_handler.h" #include "x2ap_ies_defs.h" #include "x2ap_eNB_management_procedures.h" #include "x2ap_eNB_generate_messages.h" #include "msc.h" #include "assertions.h" #include "conversions.h" struct x2ap_enb_map; struct x2ap_eNB_data_s; RB_PROTOTYPE(x2ap_enb_map, x2ap_eNB_data_s, entry, x2ap_eNB_compare_assoc_id); static void x2ap_eNB_handle_register_eNB(instance_t instance, x2ap_register_enb_req_t *x2ap_register_eNB); static void x2ap_eNB_handle_handover_req(instance_t instance, x2ap_handover_req_t *x2ap_handover_req); static void x2ap_eNB_handle_handover_resp(instance_t instance, x2ap_handover_resp_t *x2ap_handover_resp); static void x2ap_eNB_register_eNB(x2ap_eNB_instance_t *instance_p, net_ip_address_t *target_eNB_ip_addr, net_ip_address_t *local_ip_addr, uint16_t in_streams, uint16_t out_streams); static void x2ap_eNB_handle_sctp_association_resp(instance_t instance, sctp_new_association_resp_t *sctp_new_association_resp); static void x2ap_eNB_handle_sctp_data_ind(instance_t instance, sctp_data_ind_t *sctp_data_ind) { int result; DevAssert(sctp_data_ind != NULL); x2ap_eNB_handle_message(sctp_data_ind->assoc_id, sctp_data_ind->stream, sctp_data_ind->buffer, sctp_data_ind->buffer_length); result = itti_free(TASK_UNKNOWN, sctp_data_ind->buffer); AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result); } static void x2ap_eNB_handle_sctp_association_resp(instance_t instance, sctp_new_association_resp_t *sctp_new_association_resp) { x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_enb_data_p; DevAssert(sctp_new_association_resp != NULL); printf("x2ap_eNB_handle_sctp_association_resp at 1\n"); dump_trees(); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); /* if the assoc_id is already known, it is certainly because an IND was received * before. In this case, just update streams and return */ if (sctp_new_association_resp->assoc_id != -1) { x2ap_enb_data_p = x2ap_get_eNB(instance_p, sctp_new_association_resp->assoc_id, sctp_new_association_resp->ulp_cnx_id); if (x2ap_enb_data_p != NULL) { /* some sanity check - to be refined at some point */ if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) { X2AP_ERROR("x2ap_enb_data_p not NULL and sctp state not SCTP_STATE_ESTABLISHED, what to do?\n"); abort(); } x2ap_enb_data_p->in_streams = sctp_new_association_resp->in_streams; x2ap_enb_data_p->out_streams = sctp_new_association_resp->out_streams; return; } } x2ap_enb_data_p = x2ap_get_eNB(instance_p, -1, sctp_new_association_resp->ulp_cnx_id); DevAssert(x2ap_enb_data_p != NULL); printf("x2ap_eNB_handle_sctp_association_resp at 2\n"); dump_trees(); if (sctp_new_association_resp->sctp_state != SCTP_STATE_ESTABLISHED) { X2AP_WARN("Received unsuccessful result for SCTP association (%u), instance %d, cnx_id %u\n", sctp_new_association_resp->sctp_state, instance, sctp_new_association_resp->ulp_cnx_id); x2ap_handle_x2_setup_message(x2ap_enb_data_p, sctp_new_association_resp->sctp_state == SCTP_STATE_SHUTDOWN); return; } printf("x2ap_eNB_handle_sctp_association_resp at 3\n"); dump_trees(); /* Update parameters */ x2ap_enb_data_p->assoc_id = sctp_new_association_resp->assoc_id; x2ap_enb_data_p->in_streams = sctp_new_association_resp->in_streams; x2ap_enb_data_p->out_streams = sctp_new_association_resp->out_streams; printf("x2ap_eNB_handle_sctp_association_resp at 4\n"); dump_trees(); /* Prepare new x2 Setup Request */ x2ap_eNB_generate_x2_setup_request(instance_p, x2ap_enb_data_p); } static void x2ap_eNB_handle_sctp_association_ind(instance_t instance, sctp_new_association_ind_t *sctp_new_association_ind) { x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *x2ap_enb_data_p; printf("x2ap_eNB_handle_sctp_association_ind at 1 (called for instance %d)\n", instance); dump_trees(); DevAssert(sctp_new_association_ind != NULL); instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); x2ap_enb_data_p = x2ap_get_eNB(instance_p, sctp_new_association_ind->assoc_id, -1); if (x2ap_enb_data_p != NULL) abort(); // DevAssert(x2ap_enb_data_p != NULL); if (x2ap_enb_data_p == NULL) { /* Create new eNB descriptor */ x2ap_enb_data_p = calloc(1, sizeof(*x2ap_enb_data_p)); DevAssert(x2ap_enb_data_p != NULL); x2ap_enb_data_p->cnx_id = x2ap_eNB_fetch_add_global_cnx_id(); x2ap_enb_data_p->x2ap_eNB_instance = instance_p; /* Insert the new descriptor in list of known eNB * but not yet associated. */ RB_INSERT(x2ap_enb_map, &instance_p->x2ap_enb_head, x2ap_enb_data_p); x2ap_enb_data_p->state = X2AP_ENB_STATE_CONNECTED; instance_p->x2_target_enb_nb++; if (instance_p->x2_target_enb_pending_nb > 0) { instance_p->x2_target_enb_pending_nb--; } } else { X2AP_WARN("x2ap_enb_data_p already exists\n"); } printf("x2ap_eNB_handle_sctp_association_ind at 2\n"); dump_trees(); /* Update parameters */ x2ap_enb_data_p->assoc_id = sctp_new_association_ind->assoc_id; x2ap_enb_data_p->in_streams = sctp_new_association_ind->in_streams; x2ap_enb_data_p->out_streams = sctp_new_association_ind->out_streams; printf("x2ap_eNB_handle_sctp_association_ind at 3\n"); dump_trees(); } int x2ap_eNB_init_sctp (x2ap_eNB_instance_t *instance_p, net_ip_address_t *local_ip_addr) { // Create and alloc new message MessageDef *message; sctp_init_t *sctp_init = NULL; DevAssert(instance_p != NULL); DevAssert(local_ip_addr != NULL); message = itti_alloc_new_message (TASK_X2AP, SCTP_INIT_MSG); sctp_init = &message->ittiMsg.sctp_init; sctp_init->port = X2AP_PORT_NUMBER; sctp_init->ppid = X2AP_SCTP_PPID; sctp_init->ipv4 = 1; sctp_init->ipv6 = 0; sctp_init->nb_ipv4_addr = 1; #if 0 memcpy(&sctp_init->ipv4_address, local_ip_addr, sizeof(*local_ip_addr)); #endif sctp_init->ipv4_address[0] = inet_addr(local_ip_addr->ipv4_address); /* * SR WARNING: ipv6 multi-homing fails sometimes for localhost. * * * * Disable it for now. */ sctp_init->nb_ipv6_addr = 0; sctp_init->ipv6_address[0] = "0:0:0:0:0:0:0:1"; return itti_send_msg_to_task (TASK_SCTP, instance_p->instance, message); } static void x2ap_eNB_register_eNB(x2ap_eNB_instance_t *instance_p, net_ip_address_t *target_eNB_ip_address, net_ip_address_t *local_ip_addr, uint16_t in_streams, uint16_t out_streams) { MessageDef *message = NULL; sctp_new_association_req_t *sctp_new_association_req = NULL; x2ap_eNB_data_t *x2ap_enb_data = NULL; DevAssert(instance_p != NULL); DevAssert(target_eNB_ip_address != NULL); message = itti_alloc_new_message(TASK_X2AP, SCTP_NEW_ASSOCIATION_REQ); sctp_new_association_req = &message->ittiMsg.sctp_new_association_req; sctp_new_association_req->port = X2AP_PORT_NUMBER; sctp_new_association_req->ppid = X2AP_SCTP_PPID; sctp_new_association_req->in_streams = in_streams; sctp_new_association_req->out_streams = out_streams; memcpy(&sctp_new_association_req->remote_address, target_eNB_ip_address, sizeof(*target_eNB_ip_address)); memcpy(&sctp_new_association_req->local_address, local_ip_addr, sizeof(*local_ip_addr)); /* Create new eNB descriptor */ x2ap_enb_data = calloc(1, sizeof(*x2ap_enb_data)); DevAssert(x2ap_enb_data != NULL); x2ap_enb_data->cnx_id = x2ap_eNB_fetch_add_global_cnx_id(); sctp_new_association_req->ulp_cnx_id = x2ap_enb_data->cnx_id; x2ap_enb_data->assoc_id = -1; x2ap_enb_data->x2ap_eNB_instance = instance_p; /* Insert the new descriptor in list of known eNB * but not yet associated. */ RB_INSERT(x2ap_enb_map, &instance_p->x2ap_enb_head, x2ap_enb_data); x2ap_enb_data->state = X2AP_ENB_STATE_WAITING; instance_p->x2_target_enb_nb ++; instance_p->x2_target_enb_pending_nb ++; itti_send_msg_to_task(TASK_SCTP, instance_p->instance, message); } static void x2ap_eNB_handle_register_eNB(instance_t instance, x2ap_register_enb_req_t *x2ap_register_eNB) { x2ap_eNB_instance_t *new_instance; uint8_t index; DevAssert(x2ap_register_eNB != NULL); /* Look if the provided instance already exists */ new_instance = x2ap_eNB_get_instance(instance); if (new_instance != NULL) { /* Checks if it is a retry on the same eNB */ DevCheck(new_instance->eNB_id == x2ap_register_eNB->eNB_id, new_instance->eNB_id, x2ap_register_eNB->eNB_id, 0); DevCheck(new_instance->cell_type == x2ap_register_eNB->cell_type, new_instance->cell_type, x2ap_register_eNB->cell_type, 0); DevCheck(new_instance->tac == x2ap_register_eNB->tac, new_instance->tac, x2ap_register_eNB->tac, 0); DevCheck(new_instance->mcc == x2ap_register_eNB->mcc, new_instance->mcc, x2ap_register_eNB->mcc, 0); DevCheck(new_instance->mnc == x2ap_register_eNB->mnc, new_instance->mnc, x2ap_register_eNB->mnc, 0); } else { new_instance = calloc(1, sizeof(x2ap_eNB_instance_t)); DevAssert(new_instance != NULL); RB_INIT(&new_instance->x2ap_enb_head); /* Copy usefull parameters */ new_instance->instance = instance; new_instance->eNB_name = x2ap_register_eNB->eNB_name; new_instance->eNB_id = x2ap_register_eNB->eNB_id; new_instance->cell_type = x2ap_register_eNB->cell_type; new_instance->tac = x2ap_register_eNB->tac; new_instance->mcc = x2ap_register_eNB->mcc; new_instance->mnc = x2ap_register_eNB->mnc; new_instance->mnc_digit_length = x2ap_register_eNB->mnc_digit_length; /* Add the new instance to the list of eNB (meaningfull in virtual mode) */ x2ap_eNB_insert_new_instance(new_instance); X2AP_INFO("Registered new eNB[%d] and %s eNB id %u\n", instance, x2ap_register_eNB->cell_type == CELL_MACRO_ENB ? "macro" : "home", x2ap_register_eNB->eNB_id); } DevCheck(x2ap_register_eNB->nb_x2 <= X2AP_MAX_NB_ENB_IP_ADDRESS, X2AP_MAX_NB_ENB_IP_ADDRESS, x2ap_register_eNB->nb_x2, 0); /* Trying to connect to the provided list of eNB ip address */ for (index = 0; index < x2ap_register_eNB->nb_x2; index++) { if (x2ap_register_eNB->target_enb_x2_ip_address[index].active == 1 ){ X2AP_INFO("eNB[%d] eNB id %u acting as an initiator (client)\n", instance, x2ap_register_eNB->eNB_id); x2ap_eNB_register_eNB(new_instance, &x2ap_register_eNB->target_enb_x2_ip_address[index], &x2ap_register_eNB->enb_x2_ip_address, x2ap_register_eNB->sctp_in_streams, x2ap_register_eNB->sctp_out_streams); } else { /* initiate the SCTP listener */ if (x2ap_eNB_init_sctp(new_instance,&x2ap_register_eNB->enb_x2_ip_address) < 0 ) { X2AP_ERROR ("Error while sending SCTP_INIT_MSG to SCTP \n"); return; } X2AP_INFO("eNB[%d] eNB id %u acting as a listner (server)\n", instance, x2ap_register_eNB->eNB_id); } } } /* TODO: remove this hack, it's to map rnti to X2 ID in the source eNB, only 1 UE supported */ /* so we directly use index 0, no search no lock no nothing */ int x2id_to_source_rnti[1]; /* TODO: remove that, it's for the hack below */ #include "enb_config.h" static void x2ap_eNB_handle_handover_req(instance_t instance, x2ap_handover_req_t *x2ap_handover_req) { /* TODO: remove this hack (the goal is to find the correct * eNodeB structure for the target) - we need a proper way for RRC * and X2AP to identify eNodeBs * RRC knows about mod_id and X2AP knows about eNB_id (eNB_ID in * the configuration file) * as far as I understand.. CROUX */ x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *target; const Enb_properties_array_t *enb_properties = enb_config_get(); int target_enb_id = enb_properties->properties[x2ap_handover_req->target_mod_id]->eNB_id; instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); target = x2ap_is_eNB_id_in_list(target_enb_id); DevAssert(target != NULL); /* store rnti at index 0 */ x2id_to_source_rnti[0] = x2ap_handover_req->source_rnti; x2ap_eNB_generate_x2_handover_request(instance_p, target, 0); } static void x2ap_eNB_handle_handover_resp(instance_t instance, x2ap_handover_resp_t *x2ap_handover_resp) { /* TODO: remove this hack (the goal is to find the correct * eNodeB structure for the other end) - we need a proper way for RRC * and X2AP to identify eNodeBs * RRC knows about mod_id and X2AP knows about eNB_id (eNB_ID in * the configuration file) * as far as I understand.. CROUX */ x2ap_eNB_instance_t *instance_p; x2ap_eNB_data_t *target; const Enb_properties_array_t *enb_properties = enb_config_get(); int target_enb_id = enb_properties->properties[x2ap_handover_resp->target_mod_id]->eNB_id; instance_p = x2ap_eNB_get_instance(instance); DevAssert(instance_p != NULL); target = x2ap_is_eNB_id_in_list(target_enb_id); DevAssert(target != NULL); x2ap_eNB_generate_x2_handover_response(instance_p, target, x2ap_handover_resp->source_x2id); } void *x2ap_task(void *arg) { MessageDef *received_msg = NULL; int result; X2AP_DEBUG("Starting X2AP layer\n"); x2ap_eNB_prepare_internal_data(); itti_mark_task_ready(TASK_X2AP); while (1) { itti_receive_msg(TASK_X2AP, &received_msg); switch (ITTI_MSG_ID(received_msg)) { case TERMINATE_MESSAGE: itti_exit_task(); break; case X2AP_REGISTER_ENB_REQ: x2ap_eNB_handle_register_eNB(ITTI_MESSAGE_GET_INSTANCE(received_msg), &X2AP_REGISTER_ENB_REQ(received_msg)); break; case X2AP_HANDOVER_REQ: x2ap_eNB_handle_handover_req(ITTI_MESSAGE_GET_INSTANCE(received_msg), &X2AP_HANDOVER_REQ(received_msg)); break; case X2AP_HANDOVER_RESP: x2ap_eNB_handle_handover_resp(ITTI_MESSAGE_GET_INSTANCE(received_msg), &X2AP_HANDOVER_RESP(received_msg)); break; case SCTP_NEW_ASSOCIATION_RESP: x2ap_eNB_handle_sctp_association_resp(ITTI_MESSAGE_GET_INSTANCE(received_msg), &received_msg->ittiMsg.sctp_new_association_resp); break; case SCTP_NEW_ASSOCIATION_IND: x2ap_eNB_handle_sctp_association_ind(ITTI_MESSAGE_GET_INSTANCE(received_msg), &received_msg->ittiMsg.sctp_new_association_ind); break; case SCTP_DATA_IND: x2ap_eNB_handle_sctp_data_ind(ITTI_MESSAGE_GET_INSTANCE(received_msg), &received_msg->ittiMsg.sctp_data_ind); break; default: X2AP_ERROR("Received unhandled message: %d:%s\n", ITTI_MSG_ID(received_msg), ITTI_MSG_NAME(received_msg)); break; } result = itti_free (ITTI_MSG_ORIGIN_ID(received_msg), received_msg); AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result); received_msg = NULL; } return NULL; }