From 37382ec2cf26ebcd70918457cb4d2b7285c52e0d Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Wed, 24 Jan 2018 12:49:34 +0100
Subject: [PATCH] Reject any CM SERVICE we don't support

When we receive a CM Service Request, OsmoMSC should eventually verify
what kind of service it is the phone requests, and whether we support
that service.

Change-Id: I499730d760dc9ac7f599e09959c6eac4452f2eab
Closes: OS#2668
---
 src/libmsc/gsm_04_08.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/libmsc/gsm_04_08.c b/src/libmsc/gsm_04_08.c
index 90669e13c..ea40a9608 100644
--- a/src/libmsc/gsm_04_08.c
+++ b/src/libmsc/gsm_04_08.c
@@ -693,6 +693,17 @@ int gsm48_rx_mm_serv_req(struct gsm_subscriber_connection *conn, struct msgb *ms
 						GSM48_REJECT_INCORRECT_MESSAGE);
 	}
 
+	switch (req->cm_service_type) {
+	case GSM48_CMSERV_MO_CALL_PACKET:
+	case GSM48_CMSERV_EMERGENCY:
+	case GSM48_CMSERV_SMS:
+	case GSM48_CMSERV_SUP_SERV:
+		/* continue below */
+		break;
+	default:
+		return msc_gsm48_tx_mm_serv_rej(conn, GSM48_REJECT_SRV_OPT_NOT_SUPPORTED);
+	}
+
 	osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_IDENTITY, (classmark2 + classmark2_len));
 	memcpy(conn->classmark.classmark2, classmark2, classmark2_len);
 	conn->classmark.classmark2_len = classmark2_len;