[PATCH] osmo-msc[master]: restore sending of optional MM info messages

[Stefan Sperling]

Review at  https://gerrit.osmocom.org/7268

restore sending of optional MM info messages

Since commit 2483f1b050496eda7f8707327204251c57212906 the function
gsm48_tx_mm_info() was not called anymore. No MM info messages were
transmitted to phones even if MM info messages were enabled via VTY.

With this commit, we call gsm48_tx_mm_info() after sending an
AUTHENTICATION REQUEST, as recommended in TS 100 940 V7.8.0,
section 4.3.6 "MM information procedure".

Change-Id: Icc413956595588e0832dad2d758de1db8dd5529d
Related: OS#2850
---
M src/libmsc/gsm_04_08.c
1 file changed, 17 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-msc refs/changes/68/7268/1

diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c
index 08f1517..7551b55 100644
--- a/src/libmsc/gsm_04_08.c
+++ b/src/libmsc/gsm_04_08.c
@@ -3529,9 +3529,23 @@
 			       bool send_autn)
 {
 	struct gsm_subscriber_connection *conn = msc_conn_ref;
-	return gsm48_tx_mm_auth_req(conn, at->vec.rand,
-				    send_autn? at->vec.autn : NULL,
-				    at->key_seq);
+	int rc;
+
+	rc = gsm48_tx_mm_auth_req(conn, at->vec.rand, send_autn? at->vec.autn : NULL, at->key_seq);
+
+	/* ETSI TS 100 940 V7.8.0 (2000-10), 4.3.6 MM information procedure, says:
+	 * "The network may be able to select particular instants where it can send the MM INFORMATION
+	 * message without adding delay to, or interrupting, any CM layer transaction, e.g. immediately
+	 * after the AUTHENTICATION REQUEST message." */
+	if (rc == 0 && conn->network->send_mm_info) {
+		rc = gsm48_tx_mm_info(conn);
+		if (rc != 0) {
+			LOGP(DMM, LOGL_NOTICE, "Could not send MM info\n");
+			rc = 0;
+		}
+	}
+
+	return rc;
 }
 
 /* VLR asks us to send an authentication reject */

-- 
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Icc413956595588e0832dad2d758de1db8dd5529d
Gerrit-PatchSet: 1
Gerrit-Project: osmo-msc
Gerrit-Branch: master
Gerrit-Owner: Stefan Sperling <ssperling at sysmocom.de>