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/* Interaction with the SCCP subsystem */
/*
* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009-2010 by On-Waves
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <openbsc/gsm_data.h>
#include <openbsc/osmo_bsc.h>
#include <openbsc/osmo_bsc_grace.h>
#include <openbsc/osmo_msc_data.h>
#include <openbsc/debug.h>
#include <openbsc/signal.h>
#include <osmocore/gsm0808.h>
#include <osmocore/talloc.h>
#include <osmocore/protocol/gsm_08_08.h>
#include <osmocom/sccp/sccp.h>
/* SCCP helper */
#define SCCP_IT_TIMER 60
static LLIST_HEAD(active_connections);
static void msc_outgoing_sccp_data(struct sccp_connection *conn,
struct msgb *msg, unsigned int len)
{
}
static void msc_outgoing_sccp_state(struct sccp_connection *conn, int old_state)
{
}
static void bsc_sccp_force_free(struct osmo_bsc_sccp_con *data)
{
if (data->conn) {
gsm0808_clear(data->conn);
subscr_con_free(data->conn);
data->conn = NULL;
}
sccp_connection_force_free(data->sccp);
data->sccp = NULL;
bsc_delete_connection(data);
}
static void sccp_it_timeout(void *_data)
{
struct osmo_bsc_sccp_con *data =
(struct osmo_bsc_sccp_con *) _data;
sccp_connection_send_it(data->sccp);
bsc_schedule_timer(&data->sccp_it_timeout, SCCP_IT_TIMER, 0);
}
static void sccp_cc_timeout(void *_data)
{
struct osmo_bsc_sccp_con *data =
(struct osmo_bsc_sccp_con *) _data;
if (data->sccp->connection_state >= SCCP_CONNECTION_STATE_ESTABLISHED)
return;
LOGP(DMSC, LOGL_ERROR, "The connection was never established.\n");
bsc_sccp_force_free(data);
}
static void msc_sccp_write_ipa(struct sccp_connection *conn, struct msgb *msg, void *data)
{
LOGP(DMSC, LOGL_ERROR, "Writing is not implemented.\n");
msgb_free(msg);
}
static int msc_sccp_accept(struct sccp_connection *connection, void *data)
{
LOGP(DMSC, LOGL_DEBUG, "Rejecting incoming SCCP connection.\n");
return -1;
}
static int msc_sccp_read(struct msgb *msgb, unsigned int length, void *data)
{
struct bssmap_header *bs;
LOGP(DMSC, LOGL_DEBUG, "Incoming SCCP message ftom MSC: %s\n",
hexdump(msgb->l3h, length));
if (length < sizeof(*bs)) {
LOGP(DMSC, LOGL_ERROR, "The header is too short.\n");
return -1;
}
bs = (struct bssmap_header *) msgb->l3h;
if (bs->length < length - sizeof(*bs))
return -1;
switch (bs->type) {
case BSSAP_MSG_BSS_MANAGEMENT:
LOGP(DMSC, LOGL_ERROR, "BSS management not implemented.\n");
break;
default:
LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %d\n", bs->type);
}
return 0;
}
int bsc_queue_for_msc(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct sccp_connection *sccp = conn->sccp_con->sccp;
if (sccp->connection_state != SCCP_CONNECTION_STATE_ESTABLISHED) {
LOGP(DMSC, LOGL_ERROR, "The connection is not established.\n");
msgb_free(msg);
return -1;
}
sccp_connection_write(sccp, msg);
msgb_free(msg);
return 0;
}
int bsc_create_new_connection(struct gsm_subscriber_connection *conn)
{
struct gsm_network *net;
struct osmo_bsc_sccp_con *bsc_con;
struct sccp_connection *sccp;
net = conn->bts->network;
if (!net->msc_data->msc_con->is_authenticated) {
LOGP(DMSC, LOGL_ERROR, "Not connected to a MSC. Not forwarding data.\n");
return -1;
}
if (!bsc_grace_allow_new_connection(net)) {
LOGP(DMSC, LOGL_NOTICE, "BSC in grace period. No new connections.\n");
return -1;
}
sccp = sccp_connection_socket();
if (!sccp) {
LOGP(DMSC, LOGL_ERROR, "Failed to allocate memory.\n");
return -ENOMEM;
}
bsc_con = talloc_zero(conn->bts, struct osmo_bsc_sccp_con);
if (!bsc_con) {
LOGP(DMSC, LOGL_ERROR, "Failed to allocate.\n");
sccp_connection_free(sccp);
return -1;
}
/* callbacks */
sccp->state_cb = msc_outgoing_sccp_state;
sccp->data_cb = msc_outgoing_sccp_data;
sccp->data_ctx = bsc_con;
/* prepare the timers */
bsc_con->sccp_it_timeout.cb = sccp_it_timeout;
bsc_con->sccp_it_timeout.data = bsc_con;
bsc_con->sccp_cc_timeout.cb = sccp_cc_timeout;
bsc_con->sccp_cc_timeout.data = bsc_con;
bsc_con->sccp = sccp;
bsc_con->msc_con = net->msc_data->msc_con;
bsc_con->conn = conn;
llist_add(&bsc_con->entry, &active_connections);
conn->sccp_con = bsc_con;
return 0;
}
int bsc_open_connection(struct osmo_bsc_sccp_con *conn, struct msgb *msg)
{
LOGP(DMSC, LOGL_ERROR, "Not implemented yet.\n");
return -1;
}
int bsc_delete_connection(struct osmo_bsc_sccp_con *sccp)
{
if (!sccp)
return 0;
if (sccp->conn)
LOGP(DMSC, LOGL_ERROR, "Should have been cleared.\n");
llist_del(&sccp->entry);
bsc_del_timer(&sccp->sccp_it_timeout);
bsc_del_timer(&sccp->sccp_cc_timeout);
talloc_free(sccp);
return 0;
}
static void bsc_close_connections(struct bsc_msc_connection *msc_con)
{
struct osmo_bsc_sccp_con *con, *tmp;
llist_for_each_entry_safe(con, tmp, &active_connections, entry)
bsc_sccp_force_free(con);
}
static int handle_msc_signal(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
struct osmo_msc_data *data;
if (subsys != SS_MSC)
return 0;
data = (struct osmo_msc_data *) signal_data;
if (signal == S_MSC_LOST)
bsc_close_connections(data->msc_con);
return 0;
}
int osmo_bsc_sccp_init(struct gsm_network *gsmnet)
{
sccp_set_log_area(DSCCP);
sccp_system_init(msc_sccp_write_ipa, gsmnet);
sccp_connection_set_incoming(&sccp_ssn_bssap, msc_sccp_accept, NULL);
sccp_set_read(&sccp_ssn_bssap, msc_sccp_read, NULL);
register_signal_handler(SS_MSC, handle_msc_signal, gsmnet);
return 0;
}
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