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/* Implementation of RANAP messages to/from an MSC via an Iu-CS interface.
* This keeps direct RANAP dependencies out of libmsc. */
/* (C) 2016 by sysmocom s.m.f.c. GmbH <info@sysmocom.de>
*
* 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 "../../bscconfig.h"
#ifdef BUILD_IU
#include <osmocom/core/logging.h>
#include <osmocom/ranap/ranap_ies_defs.h>
#include <osmocom/ranap/iu_client.h>
#include <osmocom/ranap/RANAP_IuTransportAssociation.h>
#include <osmocom/ranap/iu_helpers.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/gsm_data.h>
#include <osmocom/msc/gsm_subscriber.h>
#include <osmocom/msc/iucs.h>
#include <osmocom/msc/vlr.h>
#include <osmocom/msc/iucs_ranap.h>
#include <osmocom/msc/osmo_msc.h>
#include <osmocom/msc/msc_mgcp.h>
#include <asn1c/asn1helpers.h>
/* To continue authorization after a Security Mode Complete */
int gsm0408_authorize(struct gsm_subscriber_connection *conn);
static int iucs_rx_rab_assign(struct gsm_subscriber_connection *conn, RANAP_RAB_SetupOrModifiedItemIEs_t * setup_ies)
{
uint8_t rab_id;
RANAP_RAB_SetupOrModifiedItem_t *item = &setup_ies->raB_SetupOrModifiedItem;
RANAP_TransportLayerAddress_t *transp_layer_addr;
RANAP_IuTransportAssociation_t *transp_assoc;
uint16_t port = 0;
int rc;
char addr[INET_ADDRSTRLEN];
rab_id = item->rAB_ID.buf[0];
LOGP(DIUCS, LOGL_NOTICE,
"Received RAB assignment event for %s rab_id=%hhd\n", vlr_subscr_name(conn->vsub), rab_id);
if (item->iuTransportAssociation && item->transportLayerAddress) {
transp_layer_addr = item->transportLayerAddress;
transp_assoc = item->iuTransportAssociation;
rc = ranap_transp_assoc_decode(&port, transp_assoc);
if (rc != 0) {
LOGP(DIUCS, LOGL_ERROR,
"Unable to decode RTP port in RAB assignment (%s rab_id=%hhd)\n",
vlr_subscr_name(conn->vsub), rab_id);
return 0;
}
rc = ranap_transp_layer_addr_decode(addr, sizeof(addr), transp_layer_addr);
if (rc != 0) {
LOGP(DIUCS, LOGL_ERROR,
"Unable to decode IP-Address in RAB assignment (%s rab_id=%hhd)\n",
vlr_subscr_name(conn->vsub), rab_id);
return 0;
}
return msc_mgcp_ass_complete(conn, port, addr);
}
LOGP(DIUCS, LOGL_ERROR,
"RAB assignment lacks RTP connection information. (%s rab_id=%hhd)\n",
vlr_subscr_name(conn->vsub), rab_id);
return 0;
}
int iucs_rx_sec_mode_compl(struct gsm_subscriber_connection *conn,
RANAP_SecurityModeCompleteIEs_t *ies)
{
OSMO_ASSERT(conn->via_ran == RAN_UTRAN_IU);
/* TODO evalute ies */
msc_rx_sec_mode_compl(conn);
return 0;
}
int iucs_rx_ranap_event(struct gsm_network *network,
struct ranap_ue_conn_ctx *ue_ctx, int type, void *data)
{
struct gsm_subscriber_connection *conn;
conn = subscr_conn_lookup_iu(network, ue_ctx);
if (!conn) {
LOGP(DRANAP, LOGL_ERROR, "Cannot find subscriber for IU event %u\n", type);
return -1;
}
switch (type) {
case RANAP_IU_EVENT_IU_RELEASE:
case RANAP_IU_EVENT_LINK_INVALIDATED:
LOGP(DIUCS, LOGL_INFO, "IuCS release for %s\n",
vlr_subscr_name(conn->vsub));
msc_subscr_conn_close(conn, 0);
return 0;
case RANAP_IU_EVENT_SECURITY_MODE_COMPLETE:
LOGP(DIUCS, LOGL_INFO, "IuCS security mode complete for %s\n",
vlr_subscr_name(conn->vsub));
return iucs_rx_sec_mode_compl(conn,
(RANAP_SecurityModeCompleteIEs_t*)data);
case RANAP_IU_EVENT_RAB_ASSIGN:
return iucs_rx_rab_assign(conn,
(RANAP_RAB_SetupOrModifiedItemIEs_t*)data);
default:
LOGP(DIUCS, LOGL_NOTICE, "Unknown message received:"
" RANAP event: %i\n", type);
return -1;
}
}
#endif /* BUILD_IU */
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