Change in osmo-bsc[master]: abis_rsl.c: make sure emergency calls are rejected early

[dexter]

dexter has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bsc/+/19580 )


Change subject: abis_rsl.c: make sure emergency calls are rejected early
......................................................................

abis_rsl.c: make sure emergency calls are rejected early

If a CHAN RQD indicates an emergency call on a BTS that does not allow
emergency calls, then respond with an IMMEDIAGE ASSIGNMENT REJECT
message to deny the emergency call early.

Related: OS#4548
Change-Id: I148c540269bffd703f38233a1e689e863c175e97
---
M src/osmo-bsc/abis_rsl.c
1 file changed, 9 insertions(+), 1 deletion(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/80/19580/1

diff --git a/src/osmo-bsc/abis_rsl.c b/src/osmo-bsc/abis_rsl.c
index 1ffdd06..15b6625 100644
--- a/src/osmo-bsc/abis_rsl.c
+++ b/src/osmo-bsc/abis_rsl.c
@@ -1394,11 +1394,19 @@
 
 	/* check availability / allocate channel
 	 *
-	 * - First try to allocate SDCCH.
+	 * - First check for EMERGENCY call attempts,
+	 * - then try to allocate SDCCH.
 	 * - If SDCCH is not available, try a TCH/H (less bandwidth).
 	 * - If there is still no channel available, try a TCH/F.
 	 *
 	 */
+	if ((rqd_ref->ra & 0xe0) == 0xa0) {
+		if (bts->si_common.rach_control.t2 & 0x4) {
+			LOG_BTS(bts, DRSL, LOGL_NOTICE, "CHAN RQD: MS attempts EMERGENCY CALL although EMERGENCY CALLS are not allowed in sysinfo (spec violation by MS!)\n");
+			rsl_tx_imm_ass_rej(bts, rqd_ref);
+			return -EINVAL;
+		}
+	}
 	lchan = lchan_select_by_type(bts, GSM_LCHAN_SDCCH);
 	if (!lchan) {
 		LOG_BTS(bts, DRSL, LOGL_NOTICE, "CHAN RQD: no resources for %s 0x%x, retrying with %s\n",

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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: I148c540269bffd703f38233a1e689e863c175e97
Gerrit-Change-Number: 19580
Gerrit-PatchSet: 1
Gerrit-Owner: dexter <pmaier at sysmocom.de>
Gerrit-MessageType: newchange
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