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/* MSC RAN connection implementation */
/*
* (C) 2016-2018 by sysmocom s.m.f.c. <info@sysmocom.de>
* All Rights Reserved
*
* Author: Neels Hofmeyr
*
* 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/logging.h>
#include <osmocom/core/fsm.h>
#include <osmocom/core/signal.h>
#include <osmocom/msc/ran_conn.h>
#include <osmocom/msc/vlr.h>
#include <osmocom/msc/debug.h>
#include <osmocom/msc/transaction.h>
#include <osmocom/msc/signal.h>
#include <osmocom/msc/sgs_iface.h>
#include <osmocom/msc/ran_peer.h>
#include <osmocom/msc/sccp_ran.h>
#include <osmocom/msc/ran_infra.h>
#include <osmocom/msc/msub.h>
struct ran_conn *ran_conn_create_incoming(struct ran_peer *ran_peer, uint32_t sccp_conn_id)
{
struct ran_conn *conn;
conn = talloc(ran_peer, struct ran_conn);
OSMO_ASSERT(conn);
*conn = (struct ran_conn){
.ran_peer = ran_peer,
.sccp_conn_id = sccp_conn_id,
};
llist_add(&conn->entry, &ran_peer->sri->ran_conns);
return conn;
}
struct ran_conn *ran_conn_create_outgoing(struct ran_peer *ran_peer)
{
/* FIXME use method being developed in gerrit id Ifd55c6b7ed2558ff072042079cf45f5068a971de */
static uint32_t next_outgoing_conn_id = 2342;
uint32_t conn_id = 0;
int attempts = 1000;
bool already_used = true;
while (attempts--) {
struct ran_conn *conn;
conn_id = next_outgoing_conn_id;
next_outgoing_conn_id++;
already_used = false;
llist_for_each_entry(conn, &ran_peer->sri->ran_conns, entry) {
if (conn->sccp_conn_id == conn_id) {
already_used = true;
break;
}
}
if (!already_used)
break;
}
if (already_used)
return NULL;
LOG_RAN_PEER(ran_peer, LOGL_DEBUG, "Outgoing conn id: %u\n", conn_id);
return ran_conn_create_incoming(ran_peer, conn_id);
}
/* Return statically allocated string of the ran_conn RAT type and id. */
const char *ran_conn_name(struct ran_conn *conn)
{
static char id[42];
int rc;
const char *ran_peer_name;
if (!conn)
return "ran_conn==NULL";
if (!conn->ran_peer || !conn->ran_peer->sri || !conn->ran_peer->sri->ran)
ran_peer_name = "no-RAN-peer";
else
ran_peer_name = osmo_rat_type_name(conn->ran_peer->sri->ran->type);
rc = snprintf(id, sizeof(id), "%s-%u", ran_peer_name, conn->sccp_conn_id);
/* < 0 is error, == 0 is empty, >= size means truncation. Not really expecting this to catch on in any practical
* situation. */
if (rc <= 0 || rc >= sizeof(id))
return "conn-name-error";
return id;
}
int ran_conn_down_l2_co(struct ran_conn *conn, struct msgb *l3, bool initial)
{
struct ran_peer_ev_ctx co = {
.conn_id = conn->sccp_conn_id,
.conn = conn,
.msg = l3,
};
if (!conn->ran_peer)
return -EIO;
return osmo_fsm_inst_dispatch(conn->ran_peer->fi,
initial ? RAN_PEER_EV_MSG_DOWN_CO_INITIAL : RAN_PEER_EV_MSG_DOWN_CO,
&co);
}
void ran_conn_msc_role_gone(struct ran_conn *conn, struct osmo_fsm_inst *msc_role)
{
if (!conn)
return;
if (conn->msc_role != msc_role)
return;
conn->msc_role = NULL;
ran_conn_close(conn);
}
/* Regularly close the conn */
void ran_conn_close(struct ran_conn *conn)
{
if (!conn)
return;
if (conn->closing)
return;
conn->closing = true;
LOG_RAN_PEER(conn->ran_peer, LOGL_DEBUG, "Closing %s\n", ran_conn_name(conn));
if (conn->msc_role) {
osmo_fsm_inst_dispatch(conn->msc_role, MSC_EV_FROM_RAN_CONN_RELEASED, NULL);
conn->msc_role = NULL;
}
if (conn->ran_peer) {
/* Todo: pass a useful SCCP cause? */
sccp_ran_disconnect(conn->ran_peer->sri, conn->sccp_conn_id, 0);
conn->ran_peer = NULL;
}
LOG_RAN_PEER(conn->ran_peer, LOGL_DEBUG, "Deallocating %s\n", ran_conn_name(conn));
llist_del(&conn->entry);
talloc_free(conn);
}
/* Same as ran_conn_close() but without sending any SCCP messages (e.g. after RESET) */
void ran_conn_discard(struct ran_conn *conn)
{
if (!conn)
return;
/* Make sure to drop dead and don't dispatch things like DISCONNECT requests on SCCP. */
conn->ran_peer = NULL;
ran_conn_close(conn);
}
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