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/* hnb-gw specific code for RANAP */
/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/core/msgb.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/gsm48.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "asn1helpers.h"
#include "hnbgw.h"
#include "hnbgw_rua.h"
#include "ranap_common.h"
#include "ranap_ies_defs.h"
static int ranap_tx_reset_ack(struct hnb_context *hnb,
RANAP_CN_DomainIndicator_t domain)
{
struct msgb *msg;
int rc;
msg = ranap_new_msg_reset_ack(domain, NULL);
if (!msg)
return -1;
rc = rua_tx_udt(hnb, msg->data, msgb_length(msg));
msgb_free(msg);
return rc;
}
static int ranap_rx_init_reset(struct hnb_context *hnb, ANY_t *in)
{
RANAP_ResetIEs_t ies;
int rc, is_ps = 0;
rc = ranap_decode_reseties(&ies, in);
if (rc < 0)
return rc;
if (ies.cN_DomainIndicator == RANAP_CN_DomainIndicator_ps_domain)
is_ps=1;
LOGP(DRANAP, LOGL_INFO, "Rx RESET.req(%s,%s)\n", is_ps ? "ps" : "cs",
ranap_cause_str(&ies.cause));
/* FIXME: Actually we have to wait for some guard time? */
/* FIXME: Reset all resources related to this HNB/RNC */
ranap_tx_reset_ack(hnb, ies.cN_DomainIndicator);
return 0;
}
static int ranap_rx_error_ind(struct hnb_context *hnb, ANY_t *in)
{
RANAP_ErrorIndicationIEs_t ies;
int rc, is_ps = 0;
rc = ranap_decode_errorindicationies(&ies, in);
if (rc < 0)
return rc;
if (ies.presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT) {
LOGP(DRANAP, LOGL_ERROR, "Rx ERROR.ind(%s)\n",
ranap_cause_str(&ies.cause));
} else
LOGP(DRANAP, LOGL_ERROR, "Rx ERROR.ind\n");
return 0;
}
int ranap_parse_lai(struct gprs_ra_id *ra_id, const RANAP_LAI_t *lai)
{
uint8_t *ptr = lai->pLMNidentity.buf;
/* TS 25.413 9.2.3.55 */
if (lai->pLMNidentity.size != 3)
return -1;
ra_id->mcc = (ptr[0] & 0xF) * 100 +
(ptr[0] >> 4) * 10 +
(ptr[1] & 0xF);
ra_id->mnc = (ptr[2] & 0xF) +
(ptr[2] >> 4) * 10;
if ((ptr[1] >> 4) != 0xF)
ra_id->mnc += (ptr[1] >> 4) * 100;
ra_id->lac = asn1str_to_u16(&lai->lAC);
/* TS 25.413 9.2.3.6 */
if (ra_id->lac == 0 || ra_id->lac == 0xfffe)
return -1;
return 0;
}
static int ranap_rx_dt(struct hnb_context *hnb, ANY_t *in)
{
RANAP_DirectTransferIEs_t ies;
int sapi = 0;
int rc;
rc = ranap_decode_directtransferies(&ies, in);
if (rc < 0)
return rc;
if (ies.presenceMask & DIRECTTRANSFERIES_RANAP_SAPI_PRESENT)
sapi = ies.sapi;
if (ies.presenceMask & DIRECTTRANSFERIES_RANAP_LAI_PRESENT) {
/* FIXME: Update LAI associated with UE */
}
if (ies.presenceMask & DIRECTTRANSFERIES_RANAP_RAC_PRESENT) {
/* FIXME: Update RAC associated with UE */
}
DEBUGP(DRANAP, "DirectTransfer: %s\n",
osmo_hexdump(ies.nas_pdu.buf, ies.nas_pdu.size));
/* FIXME: hand NAS PDU into MSC */
}
static int ranap_rx_initiating_msg(struct hnb_context *hnb, RANAP_InitiatingMessage_t *imsg)
{
int rc;
/* according tot the spec, we can primarily receive Overload,
* Reset, Reset ACK, Error Indication, reset Resource, Reset
* Resurce Acknowledge as connecitonless RANAP. There are some
* more messages regarding Information Transfer, Direct
* Information Transfer and Uplink Information Trnansfer that we
* can ignore. In either case, it is RANAP that we need to
* decode... */
switch (imsg->procedureCode) {
case RANAP_ProcedureCode_id_Reset:
/* Reset request */
rc = ranap_rx_init_reset(hnb, &imsg->value);
break;
case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */
break;
case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */
rc = ranap_rx_error_ind(hnb, &imsg->value);
break;
case RANAP_ProcedureCode_id_ResetResource: /* request */
case RANAP_ProcedureCode_id_InformationTransfer:
case RANAP_ProcedureCode_id_DirectInformationTransfer:
case RANAP_ProcedureCode_id_UplinkInformationExchange:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"Procedure %u from HNB, ignoring\n", imsg->procedureCode);
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
"Procedure %u from HNB, ignoring\n", imsg->procedureCode);
break;
}
}
static int ranap_rx_successful_msg(struct hnb_context *hnb, RANAP_SuccessfulOutcome_t *imsg)
{
int rc;
/* according tot the spec, we can primarily receive Overload,
* Reset, Reset ACK, Error Indication, reset Resource, Reset
* Resurce Acknowledge as connecitonless RANAP. There are some
* more messages regarding Information Transfer, Direct
* Information Transfer and Uplink Information Trnansfer that we
* can ignore. In either case, it is RANAP that we need to
* decode... */
switch (imsg->procedureCode) {
case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */
break;
case RANAP_ProcedureCode_id_ResetResource: /* response */
case RANAP_ProcedureCode_id_InformationTransfer:
case RANAP_ProcedureCode_id_DirectInformationTransfer:
case RANAP_ProcedureCode_id_UplinkInformationExchange:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"Procedure %u from HNB, ignoring\n", imsg->procedureCode);
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
"Procedure %u from HNB, ignoring\n", imsg->procedureCode);
break;
}
}
static int _hnbgw_ranap_rx(struct hnb_context *hnb, RANAP_RANAP_PDU_t *pdu)
{
int rc;
switch (pdu->present) {
case RANAP_RANAP_PDU_PR_initiatingMessage:
rc = ranap_rx_initiating_msg(hnb, &pdu->choice.initiatingMessage);
break;
case RANAP_RANAP_PDU_PR_successfulOutcome:
rc = ranap_rx_successful_msg(hnb, &pdu->choice.successfulOutcome);
break;
case RANAP_RANAP_PDU_PR_unsuccessfulOutcome:
LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP "
"unsuccessful outcome procedure %u from HNB, ignoring\n",
pdu->choice.unsuccessfulOutcome.procedureCode);
break;
default:
LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP "
"presence %u from HNB, ignoring\n", pdu->present);
break;
}
}
int hnbgw_ranap_rx(struct msgb *msg, uint8_t *data, size_t len)
{
RANAP_RANAP_PDU_t _pdu, *pdu = &_pdu;
asn_dec_rval_t dec_ret;
int rc;
memset(pdu, 0, sizeof(*pdu));
dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu,
data, len, 0, 0);
if (dec_ret.code != RC_OK) {
LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n");
return rc;
}
rc = _hnbgw_ranap_rx(msg->dst, pdu);
return rc;
}
int hnbgw_ranap_init(void)
{
}
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