383 lines
11 KiB
C
383 lines
11 KiB
C
/* mncc_builtin.c - default, minimal built-in MNCC Application for
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* standalone bsc_hack (network-in-the-box mode) */
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/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009 by Andreas Eversberg <Andreas.Eversberg@versatel.de>
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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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <osmocom/msc/gsm_04_08.h>
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/mncc.h>
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#include <osmocom/msc/mncc_int.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/msc/gsm_data.h>
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#include <osmocom/msc/transaction.h>
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void *tall_call_ctx;
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static LLIST_HEAD(call_list);
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static uint32_t new_callref = 0x00000001;
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struct mncc_int mncc_int = {
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.def_codec = { GSM48_CMODE_SPEECH_V1, GSM48_CMODE_SPEECH_V1 },
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};
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static void free_call(struct gsm_call *call)
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{
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llist_del(&call->entry);
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DEBUGP(DMNCC, "(call %x) Call removed.\n", call->callref);
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talloc_free(call);
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}
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static struct gsm_call *get_call_ref(uint32_t callref)
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{
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struct gsm_call *callt;
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llist_for_each_entry(callt, &call_list, entry) {
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if (callt->callref == callref)
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return callt;
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}
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return NULL;
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}
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/* on incoming call, look up database and send setup to remote subscr. */
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static int mncc_setup_ind(struct gsm_call *call, int msg_type,
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struct gsm_mncc *setup)
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{
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struct gsm_mncc mncc;
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struct gsm_call *remote;
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memset(&mncc, 0, sizeof(struct gsm_mncc));
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mncc.callref = call->callref;
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/* already have remote call */
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if (call->remote_ref)
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return 0;
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/* transfer mode 1 would be packet mode, which was never specified */
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if (setup->bearer_cap.mode != 0) {
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LOGP(DMNCC, LOGL_NOTICE, "(call %x) We don't support "
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"packet mode\n", call->callref);
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mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_BEARER_CA_UNAVAIL);
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goto out_reject;
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}
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/* we currently only do speech */
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if (setup->bearer_cap.transfer != GSM_MNCC_BCAP_SPEECH) {
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LOGP(DMNCC, LOGL_NOTICE, "(call %x) We only support "
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"voice calls\n", call->callref);
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mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_BEARER_CA_UNAVAIL);
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goto out_reject;
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}
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/* create remote call */
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if (!(remote = talloc_zero(tall_call_ctx, struct gsm_call))) {
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mncc_set_cause(&mncc, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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goto out_reject;
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}
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llist_add_tail(&remote->entry, &call_list);
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remote->net = call->net;
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remote->callref = new_callref++;
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DEBUGP(DMNCC, "(call %x) Creating new remote instance %x.\n",
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call->callref, remote->callref);
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/* link remote call */
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call->remote_ref = remote->callref;
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remote->remote_ref = call->callref;
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/* send call proceeding */
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memset(&mncc, 0, sizeof(struct gsm_mncc));
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mncc.callref = call->callref;
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DEBUGP(DMNCC, "(call %x) Accepting call.\n", call->callref);
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mncc_tx_to_cc(call->net, MNCC_CALL_PROC_REQ, &mncc);
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/* modify mode */
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memset(&mncc, 0, sizeof(struct gsm_mncc));
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mncc.callref = call->callref;
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DEBUGP(DMNCC, "(call %x) Modify channel mode\n", call->callref);
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mncc_tx_to_cc(call->net, MNCC_LCHAN_MODIFY, &mncc);
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/* send setup to remote */
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// setup->fields |= MNCC_F_SIGNAL;
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// setup->signal = GSM48_SIGNAL_DIALTONE;
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setup->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Forwarding SETUP to remote.\n", call->callref);
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return mncc_tx_to_cc(remote->net, MNCC_SETUP_REQ, setup);
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out_reject:
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mncc_tx_to_cc(call->net, MNCC_REJ_REQ, &mncc);
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free_call(call);
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return 0;
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}
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static int mncc_alert_ind(struct gsm_call *call, int msg_type,
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struct gsm_mncc *alert)
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{
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struct gsm_call *remote;
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/* send alerting to remote */
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if (!(remote = get_call_ref(call->remote_ref)))
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return 0;
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alert->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Forwarding ALERT to remote.\n", call->callref);
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return mncc_tx_to_cc(remote->net, MNCC_ALERT_REQ, alert);
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}
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static int mncc_notify_ind(struct gsm_call *call, int msg_type,
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struct gsm_mncc *notify)
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{
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struct gsm_call *remote;
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/* send notify to remote */
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if (!(remote = get_call_ref(call->remote_ref)))
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return 0;
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notify->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Forwarding NOTIF to remote.\n", call->callref);
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return mncc_tx_to_cc(remote->net, MNCC_NOTIFY_REQ, notify);
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}
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static int mncc_setup_cnf(struct gsm_call *call, int msg_type,
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struct gsm_mncc *connect)
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{
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struct gsm_mncc connect_ack, frame_recv;
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struct gsm_network *net = call->net;
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struct gsm_call *remote;
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struct gsm_mncc_bridge bridge = { .msg_type = MNCC_BRIDGE };
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/* acknowledge connect */
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memset(&connect_ack, 0, sizeof(struct gsm_mncc));
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connect_ack.callref = call->callref;
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DEBUGP(DMNCC, "(call %x) Acknowledge SETUP.\n", call->callref);
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mncc_tx_to_cc(call->net, MNCC_SETUP_COMPL_REQ, &connect_ack);
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/* send connect message to remote */
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if (!(remote = get_call_ref(call->remote_ref)))
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return 0;
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connect->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Sending CONNECT to remote.\n", call->callref);
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mncc_tx_to_cc(remote->net, MNCC_SETUP_RSP, connect);
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/* bridge tch */
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bridge.callref[0] = call->callref;
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bridge.callref[1] = call->remote_ref;
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DEBUGP(DMNCC, "(call %x) Bridging with remote.\n", call->callref);
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/* proxy mode */
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if (!net->handover.active) {
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/* in the no-handover case, we can bridge, i.e. use
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* the old RTP proxy code */
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return mncc_tx_to_cc(call->net, MNCC_BRIDGE, &bridge);
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} else {
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/* in case of handover, we need to re-write the RTP
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* SSRC, sequence and timestamp values and thus
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* need to enable RTP receive for both directions */
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memset(&frame_recv, 0, sizeof(struct gsm_mncc));
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frame_recv.callref = call->callref;
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mncc_tx_to_cc(call->net, MNCC_FRAME_RECV, &frame_recv);
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frame_recv.callref = call->remote_ref;
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return mncc_tx_to_cc(call->net, MNCC_FRAME_RECV, &frame_recv);
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}
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}
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static int mncc_disc_ind(struct gsm_call *call, int msg_type,
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struct gsm_mncc *disc)
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{
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struct gsm_call *remote;
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/* send release */
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DEBUGP(DMNCC, "(call %x) Releasing call with cause %d\n",
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call->callref, disc->cause.value);
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mncc_tx_to_cc(call->net, MNCC_REL_REQ, disc);
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/* send disc to remote */
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if (!(remote = get_call_ref(call->remote_ref))) {
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return 0;
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}
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disc->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Disconnecting remote with cause %d\n",
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remote->callref, disc->cause.value);
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return mncc_tx_to_cc(remote->net, MNCC_DISC_REQ, disc);
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}
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static int mncc_rel_ind(struct gsm_call *call, int msg_type, struct gsm_mncc *rel)
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{
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struct gsm_call *remote;
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/* send release to remote */
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if (!(remote = get_call_ref(call->remote_ref))) {
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free_call(call);
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return 0;
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}
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rel->callref = remote->callref;
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DEBUGP(DMNCC, "(call %x) Releasing remote with cause %d\n",
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call->callref, rel->cause.value);
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/*
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* Release this side of the call right now. Otherwise we end up
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* in this method for the other call and will also try to release
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* it and then we will end up with a double free and a crash
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*/
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free_call(call);
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mncc_tx_to_cc(remote->net, MNCC_REL_REQ, rel);
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return 0;
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}
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static int mncc_rel_cnf(struct gsm_call *call, int msg_type, struct gsm_mncc *rel)
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{
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free_call(call);
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return 0;
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}
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/* Internal MNCC handler input function (from CC -> MNCC -> here) */
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int int_mncc_recv(struct gsm_network *net, struct msgb *msg)
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{
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void *arg = msgb_data(msg);
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struct gsm_mncc *data = arg;
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int msg_type = data->msg_type;
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int callref;
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struct gsm_call *call = NULL, *callt;
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int rc = 0;
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/* Special messages */
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switch(msg_type) {
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}
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/* find callref */
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callref = data->callref;
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llist_for_each_entry(callt, &call_list, entry) {
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if (callt->callref == callref) {
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call = callt;
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break;
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}
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}
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/* create callref, if setup is received */
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if (!call) {
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if (msg_type != MNCC_SETUP_IND)
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goto out_free; /* drop */
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/* create call */
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if (!(call = talloc_zero(tall_call_ctx, struct gsm_call))) {
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struct gsm_mncc rel;
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memset(&rel, 0, sizeof(struct gsm_mncc));
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rel.callref = callref;
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mncc_set_cause(&rel, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_RESOURCE_UNAVAIL);
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mncc_tx_to_cc(net, MNCC_REL_REQ, &rel);
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goto out_free;
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}
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llist_add_tail(&call->entry, &call_list);
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call->net = net;
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call->callref = callref;
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DEBUGP(DMNCC, "(call %x) Call created.\n", call->callref);
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}
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if (mncc_is_data_frame(msg_type)) {
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LOGP(DMNCC, LOGL_ERROR, "(call %x) Received data frame, which is not supported.\n",
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call->callref);
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goto out_free;
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}
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DEBUGP(DMNCC, "(call %x) Received message %s\n", call->callref,
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get_mncc_name(msg_type));
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switch(msg_type) {
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case MNCC_SETUP_IND:
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rc = mncc_setup_ind(call, msg_type, arg);
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break;
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case MNCC_SETUP_CNF:
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rc = mncc_setup_cnf(call, msg_type, arg);
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break;
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case MNCC_SETUP_COMPL_IND:
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break;
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case MNCC_CALL_CONF_IND:
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/* we now need to MODIFY the channel */
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mncc_tx_to_cc(call->net, MNCC_LCHAN_MODIFY, data);
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break;
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case MNCC_ALERT_IND:
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rc = mncc_alert_ind(call, msg_type, arg);
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break;
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case MNCC_NOTIFY_IND:
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rc = mncc_notify_ind(call, msg_type, arg);
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break;
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case MNCC_DISC_IND:
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rc = mncc_disc_ind(call, msg_type, arg);
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break;
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case MNCC_REL_IND:
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case MNCC_REJ_IND:
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rc = mncc_rel_ind(call, msg_type, arg);
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break;
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case MNCC_REL_CNF:
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rc = mncc_rel_cnf(call, msg_type, arg);
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break;
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case MNCC_FACILITY_IND:
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break;
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case MNCC_START_DTMF_IND:
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rc = mncc_tx_to_cc(net, MNCC_START_DTMF_REJ, data);
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break;
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case MNCC_STOP_DTMF_IND:
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rc = mncc_tx_to_cc(net, MNCC_STOP_DTMF_RSP, data);
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break;
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case MNCC_MODIFY_IND:
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mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
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DEBUGP(DMNCC, "(call %x) Rejecting MODIFY with cause %d\n",
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call->callref, data->cause.value);
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rc = mncc_tx_to_cc(net, MNCC_MODIFY_REJ, data);
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break;
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case MNCC_MODIFY_CNF:
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break;
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case MNCC_HOLD_IND:
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mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
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DEBUGP(DMNCC, "(call %x) Rejecting HOLD with cause %d\n",
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call->callref, data->cause.value);
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rc = mncc_tx_to_cc(net, MNCC_HOLD_REJ, data);
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break;
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case MNCC_RETRIEVE_IND:
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mncc_set_cause(data, GSM48_CAUSE_LOC_PRN_S_LU,
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GSM48_CC_CAUSE_SERV_OPT_UNIMPL);
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DEBUGP(DMNCC, "(call %x) Rejecting RETRIEVE with cause %d\n",
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call->callref, data->cause.value);
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rc = mncc_tx_to_cc(net, MNCC_RETRIEVE_REJ, data);
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break;
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default:
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LOGP(DMNCC, LOGL_NOTICE, "(call %x) Message unhandled\n", callref);
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break;
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}
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out_free:
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msgb_free(msg);
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return rc;
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}
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