175 lines
4.8 KiB
C
175 lines
4.8 KiB
C
/* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2010 by On-Waves
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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 <openbsc/osmo_bsc.h>
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#include <openbsc/osmo_msc_data.h>
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#include <openbsc/debug.h>
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#include <osmocore/protocol/gsm_08_08.h>
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#include <osmocore/gsm0808.h>
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#define return_when_not_connected(conn) \
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if (!conn->sccp_con) {\
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LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \
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return; \
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}
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#define return_when_not_connected_val(conn, ret) \
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if (!conn->sccp_con) {\
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LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \
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return ret; \
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}
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#define queue_msg_or_return(resp) \
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if (!resp) { \
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LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); \
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return; \
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} \
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bsc_queue_for_msc(conn->sccp_con, resp);
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static uint16_t get_network_code_for_msc(struct gsm_network *net)
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{
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if (net->msc_data->core_ncc != -1)
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return net->msc_data->core_ncc;
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return net->network_code;
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}
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static uint16_t get_country_code_for_msc(struct gsm_network *net)
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{
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if (net->msc_data->core_mcc != -1)
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return net->msc_data->core_mcc;
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return net->country_code;
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}
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static void bsc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci)
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{
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struct msgb *resp;
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return_when_not_connected(conn);
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resp = gsm0808_create_sapi_reject(dlci);
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queue_msg_or_return(resp);
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}
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static void bsc_cipher_mode_compl(struct gsm_subscriber_connection *conn,
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struct msgb *msg, uint8_t chosen_encr)
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{
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struct msgb *resp;
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return_when_not_connected(conn);
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LOGP(DMSC, LOGL_DEBUG, "CIPHER MODE COMPLETE from MS, forwarding to MSC\n");
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resp = gsm0808_create_cipher_complete(msg, chosen_encr);
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queue_msg_or_return(resp);
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}
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/*
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* Instruct to reserve data for a new connectiom, create the complete
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* layer three message, send it to open the connection.
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*/
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static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg,
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uint16_t chosen_channel)
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{
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struct msgb *resp;
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uint16_t network_code = get_network_code_for_msc(conn->bts->network);
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uint16_t country_code = get_country_code_for_msc(conn->bts->network);
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/* allocate resource for a new connection */
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if (bsc_create_new_connection(conn) != 0)
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return BSC_API_CONN_POL_REJECT;
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bsc_scan_bts_msg(conn, msg);
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resp = gsm0808_create_layer3(msg, network_code, country_code,
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conn->bts->location_area_code,
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conn->bts->cell_identity);
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if (!resp) {
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LOGP(DMSC, LOGL_DEBUG, "Failed to create layer3 message.\n");
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bsc_delete_connection(conn->sccp_con);
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return BSC_API_CONN_POL_REJECT;
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}
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if (bsc_open_connection(conn->sccp_con, resp) != 0) {
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bsc_delete_connection(conn->sccp_con);
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msgb_free(resp);
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return BSC_API_CONN_POL_REJECT;
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}
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return BSC_API_CONN_POL_ACCEPT;
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}
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static void bsc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg)
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{
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struct msgb *resp;
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return_when_not_connected(conn);
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bsc_scan_bts_msg(conn, msg);
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resp = gsm0808_create_dtap(msg, link_id);
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queue_msg_or_return(resp);
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}
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static void bsc_assign_compl(struct gsm_subscriber_connection *conn, uint8_t rr_cause,
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uint8_t chosen_channel, uint8_t encr_alg_id,
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uint8_t speech_model)
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{
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struct msgb *resp;
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return_when_not_connected(conn);
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resp = gsm0808_create_assignment_completed(rr_cause, chosen_channel,
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encr_alg_id, speech_model);
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queue_msg_or_return(resp);
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}
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static void bsc_assign_fail(struct gsm_subscriber_connection *conn,
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uint8_t cause, uint8_t *rr_cause)
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{
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struct msgb *resp;
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return_when_not_connected(conn);
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resp = gsm0808_create_assignment_failure(cause, rr_cause);
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queue_msg_or_return(resp);
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}
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static int bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause)
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{
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struct msgb *resp;
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return_when_not_connected_val(conn, 1);
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resp = gsm0808_create_clear_rqst(GSM0808_CAUSE_RADIO_INTERFACE_FAILURE);
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if (!resp) {
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LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n");
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return 0;
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}
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bsc_queue_for_msc(conn->sccp_con, resp);
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return 0;
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}
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static struct bsc_api bsc_handler = {
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.sapi_n_reject = bsc_sapi_n_reject,
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.cipher_mode_compl = bsc_cipher_mode_compl,
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.compl_l3 = bsc_compl_l3,
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.dtap = bsc_dtap,
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.assign_compl = bsc_assign_compl,
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.assign_fail = bsc_assign_fail,
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.clear_request = bsc_clear_request,
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};
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struct bsc_api *osmo_bsc_api()
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{
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return &bsc_handler;
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}
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