From c1cd333072062e676a8cab4a0931beddb7b4a788 Mon Sep 17 00:00:00 2001
From: Alexander Couzens <lynxis@fe80.eu>
Date: Wed, 23 Sep 2020 23:24:02 +0200
Subject: ns2: check the specific bit of NS SDU Control bits

Change-Id: I9632abe70585cb7aff2602590453d903dd88b48a
---
 src/gb/gprs_ns2_vc_fsm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/gb/gprs_ns2_vc_fsm.c b/src/gb/gprs_ns2_vc_fsm.c
index 7b07a497..d13f1ce6 100644
--- a/src/gb/gprs_ns2_vc_fsm.c
+++ b/src/gb/gprs_ns2_vc_fsm.c
@@ -473,7 +473,8 @@ static void gprs_ns2_recv_unitdata(struct osmo_fsm_inst *fi,
 	nsp.bvci = bvci;
 	nsp.nsei = priv->nsvc->nse->nsei;
 
-	if (nsh->data[0])
+	/* 10.3.9 NS SDU Control Bits */
+	if (nsh->data[0] & 0x1)
 		nsp.u.unitdata.change = NS_ENDPOINT_REQUEST_CHANGE;
 
 	osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA,
-- 
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