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gsm_04_08_rr: block EMERGENCY SETUP when EMERGENCY CALLS are denied 

If the BSC configuration is set up to deny emergency calls, make sure
that an EMERGENCY SETUP will not be passed to the MSC, instead ensure
that the call is released.

Change-Id: Ia6eb38370ce4165d221d2ffbe1cd105c0628313c
Related: OS#4548
This commit is contained in:
Philipp Maier 2020-07-16 17:02:54 +02:00 committed by laforge
parent a7f02c6899
commit e8296d285b
1 changed files with 19 additions and 0 deletions
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19
src/osmo-bsc/gsm_04_08_rr.c
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@ -43,6 +43,7 @@
#include <osmocom/bsc/handover_fsm.h>
#include <osmocom/bsc/gsm_08_08.h>
#include <osmocom/bsc/gsm_data.h>
#include <osmocom/bsc/bsc_msc_data.h>
#include <osmocom/bsc/system_information.h>
#include <osmocom/bsc/bts.h>
@ -988,6 +989,24 @@ static void dispatch_dtap(struct gsm_subscriber_connection *conn,
break;
}
break;
case GSM48_PDISC_CC:
/* Make sure that EMERGENCY CALLS can not be made if the
* VTY configuration does not permit. */
if (msg_type == GSM48_MT_CC_EMERG_SETUP) {
if (msg->lchan->ts->trx->bts->si_common.rach_control.t2 & 0x4) {
LOG_LCHAN(msg->lchan, LOGL_NOTICE, "MS attempts EMERGENCY SETUP although EMERGENCY CALLS"
" are not allowed in sysinfo (spec violation by MS!)\n");
lchan_release(msg->lchan, true, true, GSM48_RR_CAUSE_PREMPTIVE_REL);
break;
}
if (!conn->sccp.msc->allow_emerg) {
LOG_LCHAN(msg->lchan, LOGL_NOTICE, "MS attempts EMERGENCY SETUP, but EMERGENCY CALLS are"
" denied on this BSC (check BTS config!)\n");
lchan_release(msg->lchan, true, true, GSM48_RR_CAUSE_PREMPTIVE_REL);
break;
}
}
/* fall through */
default:
bsc_dtap(conn, link_id, msg);
break;