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