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/* RANAP interface for a ran-network node */
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/* (C) 2021 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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 <osmocom/ranap/ranap_common.h>
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#include <osmocom/ranap/ranap_common_ran.h>
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#include <osmocom/ranap/ranap_ies_defs.h>
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#define DRANAP _ranap_DRANAP
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static int ran_ranap_rx_initiating_msg_co(void *ctx, RANAP_InitiatingMessage_t *imsg, 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", 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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rc = ranap_decode_rab_assignmentrequesties(&message->msg.raB_AssignmentRequestIEs, &imsg->value);
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break;
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case RANAP_ProcedureCode_id_Iu_Release:
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rc = ranap_decode_iu_releasecommandies(&message->msg.iu_ReleaseCommandIEs, &imsg->value);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP Procedure %s (CO, IM) from CN, 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 void ran_ranap_free_initiating_msg_co(ranap_message *message)
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{
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switch (message->procedureCode) {
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case RANAP_ProcedureCode_id_RAB_Assignment:
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ranap_free_rab_assignmentrequesties(&message->msg.raB_AssignmentRequestIEs);
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break;
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case RANAP_ProcedureCode_id_Iu_Release:
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ranap_free_iu_releasecommandies(&message->msg.iu_ReleaseCommandIEs);
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break;
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default:
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LOGP(DRANAP, LOGL_NOTICE, "Not freeing suspicious RANAP "
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"Procedure %s (CO, IM) from CN\n",
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get_value_string(ranap_procedure_code_vals, message->procedureCode));
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break;
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}
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}
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static int _ran_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 = ran_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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LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
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"successful outcome procedure %s (CO) from CN, ignoring\n",
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get_value_string(ranap_procedure_code_vals, pdu->choice.successfulOutcome.procedureCode));
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rc = -1;
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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 CN, ignoring\n",
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get_value_string(ranap_procedure_code_vals, pdu->choice.unsuccessfulOutcome.procedureCode));
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rc = -1;
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break;
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case RANAP_RANAP_PDU_PR_outcome:
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LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
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"outcome procedure %s (CO) from CN, ignoring\n",
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get_value_string(ranap_procedure_code_vals, pdu->choice.outcome.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 CN, ignoring\n", 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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/* free a decoded connection-oriented RANAP message */
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void ranap_ran_rx_co_free(ranap_message *message)
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{
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switch (message->direction) {
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case RANAP_RANAP_PDU_PR_initiatingMessage:
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ran_ranap_free_initiating_msg_co(message);
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break;
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case RANAP_RANAP_PDU_PR_successfulOutcome:
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LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
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"successful outcome procedure (CO) from CN\n");
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break;
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case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
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LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
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"unsuccessful outcome procedure (CO) from CN\n");
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break;
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case RANAP_RANAP_PDU_PR_outcome:
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LOGP(DRANAP, LOGL_NOTICE, "Not freeing unsupported RANAP "
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"outcome procedure (CO) from CN\n");
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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 CN, ignoring\n",
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get_value_string(ranap_presence_vals, message->direction));
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break;
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}
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}
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/* decode a connection-oriented RANAP message */
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int ranap_ran_rx_co_decode(void *ctx, ranap_message *message, uint8_t *data, size_t len)
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{
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RANAP_RANAP_PDU_t *pdu = NULL;
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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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dec_ret = aper_decode(NULL, &asn_DEF_RANAP_RANAP_PDU, (void **)&pdu, 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 -1;
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}
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message->direction = pdu->present;
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rc = _ran_ranap_rx_co(ctx, pdu, 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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/* 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 ranap_ran_rx_co(ranap_handle_cb cb, void *ctx, uint8_t *data, size_t len)
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{
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ranap_message message;
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int rc;
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rc = ranap_ran_rx_co_decode(ctx, &message, data, len);
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if (rc == 0)
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(*cb) (ctx, &message);
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else
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LOGP(DRANAP, LOGL_ERROR, "Not calling ran_ranap_handle_co() due to rc=%d\n", rc);
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/* Free the asn1 structs in message */
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ranap_ran_rx_co_free(&message);
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return rc;
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}
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