Add new common RANAP parsing code for CN elements
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/* RANAP interface for a core-network node */
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/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/logging.h>
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#include "ranap_common.h"
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#include "ranap_ies_defs.h"
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#include "cn_ranap_common.h"
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static int cn_ranap_rx_initiating_msg_co(void *ctx, RANAP_InitiatingMessage_t *imsg,
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ranap_message *message)
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{
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int rc = 0;
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message->procedureCode = imsg->procedureCode;
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message->criticality = imsg->criticality;
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DEBUGP(DRANAP, "Rx CO IM (%s)\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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switch (imsg->procedureCode) {
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case RANAP_ProcedureCode_id_InitialUE_Message:
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rc = ranap_decode_initialue_messageies(&message->msg.initialUE_MessageIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_DirectTransfer:
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rc = ranap_decode_directtransferies(&message->msg.directTransferIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_RAB_ReleaseRequest:
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/* RNC requests the release of RAB */
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rc = ranap_decode_rab_releaserequesties(&message->msg.raB_ReleaseRequestIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_Iu_ReleaseRequest:
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/* RNC requests the release of Iu */
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rc = ranap_decode_iu_releaserequesties(&message->msg.iu_ReleaseRequestIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_ErrorIndication:
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rc = ranap_decode_errorindicationies(&message->msg.errorIndicationIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_RAB_ModifyRequest:
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rc = ranap_decode_rab_modifyrequesties(&message->msg.raB_ModifyRequestIEs, &imsg->value);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"Procedure %s (CO, IM) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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rc = -1;
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break;
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}
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return rc;
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}
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static int cn_ranap_rx_successful_msg_co(void *ctx, RANAP_SuccessfulOutcome_t *imsg,
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ranap_message *message)
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{
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int rc = 0;
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message->procedureCode = imsg->procedureCode;
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message->criticality = imsg->criticality;
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DEBUGP(DRANAP, "Rx CL SO (%s)\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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switch (imsg->procedureCode) {
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case RANAP_ProcedureCode_id_RAB_Assignment:
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/* RAB assignment response */
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rc = ranap_decode_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_SecurityModeControl:
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/* Security Mode Complete */
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rc = ranap_decode_securitymodecompleteies(&message->msg.securityModeCompleteIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_Iu_Release:
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/* Iu release Complete; confirmation of CN-initiated release */
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rc = ranap_decode_iu_releasecompleteies(&message->msg.iu_ReleaseCompleteIEs, &imsg->value);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"Procedure %s (SO) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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rc = -1;
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break;
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}
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return rc;
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}
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static int _cn_ranap_rx_co(void *ctx, RANAP_RANAP_PDU_t *pdu, ranap_message *message)
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{
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int rc = 0;
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switch (pdu->present) {
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case RANAP_RANAP_PDU_PR_initiatingMessage:
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rc = cn_ranap_rx_initiating_msg_co(ctx, &pdu->choice.initiatingMessage, message);
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break;
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case RANAP_RANAP_PDU_PR_successfulOutcome:
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rc = cn_ranap_rx_successful_msg_co(ctx, &pdu->choice.successfulOutcome, message);
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break;
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case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
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LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
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"unsuccessful outcome procedure %s (CO) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals,
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pdu->choice.unsuccessfulOutcome.procedureCode));
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rc = -1;
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"presence %s (CO) from RNC, ignoring\n",
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get_value_string(ranap_presence_vals, pdu->present));
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rc = -1;
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break;
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}
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return rc;
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}
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/* receive a connection-oriented RANAP message and call
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* cn_ranap_handle_co() with the resulting ranap_message struct */
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int cn_ranap_rx_co(void *ctx, uint8_t *data, size_t len)
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{
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RANAP_RANAP_PDU_t *pdu = NULL;
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ranap_message message;
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asn_dec_rval_t dec_ret;
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int rc;
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memset(&message, 0, sizeof(message));
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memset(pdu, 0, sizeof(*pdu));
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dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu,
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data, len, 0, 0);
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if (dec_ret.code != RC_OK) {
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LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n");
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return rc;
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}
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message.direction = pdu->present;
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rc = _cn_ranap_rx_co(ctx, pdu, &message);
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if (rc == 0)
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cn_ranap_handle_co(ctx, &message);
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ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu);
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return rc;
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}
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static int cn_ranap_rx_initiating_msg_cl(void *ctx, RANAP_InitiatingMessage_t *imsg,
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ranap_message *message)
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{
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int rc;
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message->procedureCode = imsg->procedureCode;
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message->criticality = imsg->criticality;
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DEBUGP(DRANAP, "Rx CL IM (%s)\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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switch (imsg->procedureCode) {
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case RANAP_ProcedureCode_id_Reset:
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/* Reset request */
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rc = ranap_decode_reseties(&message->msg.resetIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */
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rc = ranap_decode_overloadies(&message->msg.overloadIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */
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rc = ranap_decode_errorindicationies(&message->msg.errorIndicationIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_ResetResource: /* request */
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rc = ranap_decode_resetresourceies(&message->msg.resetResourceIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_InformationTransfer:
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rc = ranap_decode_informationtransferindicationies(&message->msg.informationTransferIndicationIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_DirectInformationTransfer:
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rc = ranap_decode_directinformationtransferies(&message->msg.directInformationTransferIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_UplinkInformationExchange:
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rc = ranap_decode_uplinkinformationexchangerequesties(&message->msg.uplinkInformationExchangeRequestIEs, &imsg->value);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"Procedure %s (CL, IM) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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break;
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}
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}
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static int cn_ranap_rx_successful_msg_cl(void *ctx, RANAP_SuccessfulOutcome_t *imsg,
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ranap_message *message)
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{
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int rc;
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message->procedureCode = imsg->procedureCode;
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message->criticality = imsg->criticality;
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DEBUGP(DRANAP, "Rx CL SO (%s)\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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switch (imsg->procedureCode) {
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case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */
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rc = ranap_decode_resetacknowledgeies(&message->msg.resetAcknowledgeIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_ResetResource: /* response */
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rc = ranap_decode_resetresourceacknowledgeies(&message->msg.resetResourceAcknowledgeIEs, &imsg->value);
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case RANAP_ProcedureCode_id_InformationTransfer:
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rc = ranap_decode_resetresourceacknowledgeies(&message->msg.resetResourceAcknowledgeIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_DirectInformationTransfer:
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rc = ranap_decode_informationtransferconfirmationies(&message->msg.informationTransferConfirmationIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_UplinkInformationExchange:
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rc = ranap_decode_uplinkinformationexchangeresponseies(&message->msg.uplinkInformationExchangeResponseIEs, &imsg->value);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"Procedure %s (CL, SO) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals, imsg->procedureCode));
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break;
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}
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}
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static int _cn_ranap_rx_cl(void *ctx, RANAP_RANAP_PDU_t *pdu, ranap_message *message)
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{
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int rc;
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switch (pdu->present) {
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case RANAP_RANAP_PDU_PR_initiatingMessage:
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rc = cn_ranap_rx_initiating_msg_cl(ctx, &pdu->choice.initiatingMessage,
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message);
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break;
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case RANAP_RANAP_PDU_PR_successfulOutcome:
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rc = cn_ranap_rx_successful_msg_cl(ctx, &pdu->choice.successfulOutcome,
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message);
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break;
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case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
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LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
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"unsuccessful outcome procedure %s (CL) from RNC, ignoring\n",
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get_value_string(ranap_procedure_code_vals,
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pdu->choice.unsuccessfulOutcome.procedureCode));
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
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"presence %s (CL) from RNC, ignoring\n",
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get_value_string(ranap_presence_vals, pdu->present));
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break;
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}
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}
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/* receive a connection-oriented RANAP message and call
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* cn_ranap_handle_co() with the resulting ranap_message struct */
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int cn_ranap_rx_cl(void *ctx, uint8_t *data, size_t len)
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{
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RANAP_RANAP_PDU_t *pdu = NULL;
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ranap_message message;
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asn_dec_rval_t dec_ret;
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int rc;
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memset(&message, 0, sizeof(message));
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memset(pdu, 0, sizeof(*pdu));
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dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu,
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data, len, 0, 0);
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if (dec_ret.code != RC_OK) {
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LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n");
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return rc;
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}
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message.direction = pdu->present;
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rc = _cn_ranap_rx_cl(ctx, pdu, &message);
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if (rc == 0)
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cn_ranap_handle_cl(ctx, &message);
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ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu);
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return rc;
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}
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@ -0,0 +1,17 @@
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#pragma once
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#include <stdint.h>
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#include "ranap_common.h"
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#include "ranap_ies_defs.h"
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/* call-back functions to be provided by actual core network node */
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int cn_ranap_handle_co(void *ctx, ranap_message *message);
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int cn_ranap_handle_cl(void *ctx, ranap_message *message);
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/* receive a connections-liess RANAP message */
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int cn_ranap_rx_cl(void *ctx, uint8_t *data, size_t len);
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/* receive a connection-oriented RANAP message */
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int cn_ranap_rx_co(void *ctx, uint8_t *data, size_t len);
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