jolly has uploaded this change for review.
Indicate errior and release BSS connection when SMS transaction fails
When the creation of the transaction structure fails, the MSC will
send a CP-ERROR message.
This patch ensures that the MSC_A use counter is decremented, so
that the BSS connection is released, if it is not used by any other
transaction.
Without this patch, the msc_a_fsm would wait 5 seconds for an initial
transaction before releasing the BSS connection.
Related: OS#6427
Change-Id: I82da9c283205c69b19ceb4ba40ac5aa7f37d159b
---
M src/libmsc/gsm_04_11.c
1 file changed, 20 insertions(+), 1 deletion(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-msc refs/changes/14/38514/1
diff --git a/src/libmsc/gsm_04_11.c b/src/libmsc/gsm_04_11.c
index 6536d0b..d2a919c 100644
--- a/src/libmsc/gsm_04_11.c
+++ b/src/libmsc/gsm_04_11.c
@@ -231,6 +231,20 @@
return gsm411_sendmsg(trans, msg);
}
+int gsm411_send_cp_error(struct msc_a *msc_a, uint8_t pdisc, uint8_t cause)
+{
+ struct msgb *msg = gsm411_msgb_alloc();
+ struct gsm48_hdr *gh;
+
+ msgb_put_u8(msg, cause);
+
+ gh = (struct gsm48_hdr *) msgb_push(msg, sizeof(*gh));
+ gh->proto_discr = pdisc;
+ gh->msg_type = GSM411_MT_CP_ERROR;
+
+ return msc_a_tx_dtap_to_i(msc_a, msg);
+}
+
/* mm_send: receive MMCCSMS sap message from SMC */
static int gsm411_mm_send(struct gsm411_smc_inst *inst, int msg_type,
struct msgb *msg, int cp_msg_type)
@@ -1318,7 +1332,12 @@
new_trans = 1;
trans = gsm411_trans_init(net, vsub, msc_a, transaction_id, true);
if (!trans) {
- /* FIXME: send some error message */
+ /* Send error message. */
+ gsm411_send_cp_error(msc_a, GSM48_PDISC_SMS | (transaction_id << 4),
+ GSM411_CP_CAUSE_NET_FAIL);
+ /* Decrement use counter that has been incremented by CM Service Request (SMS).
+ * If there is no other service request, the BSS connection will be released. */
+ msc_a_put(msc_a, MSC_A_USE_CM_SERVICE_SMS);
return -ENOMEM;
}
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