pespin has uploaded this change for review.
sccp: Handle N-NOTICE.ind (Routing Failure of SCCP CL messages)
ITU Q.714 2.8:
"""
When an end node is informed of a routing failure, this information
is forwarded towards the SCCP user by using the N-DISCONNECT primitive
(refer to reason for release in 2.1.1.2.4/Q.711) or the N-NOTICE primitive
(refer to reason for return in 2.2.2.2.4/Q.711)
"""
We are already handling N-DISCONNECT.ind for CO messages, but
N-NOTICE.ind for CL messages was not being handled.
If CL messages are not arriving to the Lb peer, then reset the link
and mark the peer as disconnected, until a new RESET can successfully fo
through.
Related: OS#5917
Change-Id: I4bfea43a99c768162faefde06558941f697bd718
---
M src/osmo-smlc/sccp_lb_inst.c
1 file changed, 35 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-smlc refs/changes/11/40711/1
diff --git a/src/osmo-smlc/sccp_lb_inst.c b/src/osmo-smlc/sccp_lb_inst.c
index bfe8a0e..cea74bf 100644
--- a/src/osmo-smlc/sccp_lb_inst.c
+++ b/src/osmo-smlc/sccp_lb_inst.c
@@ -85,6 +85,36 @@
return sli;
}
+static void handle_notice_ind(struct sccp_lb_inst *sli, const struct osmo_scu_notice_param *ni)
+{
+ struct lb_peer *lbp;
+
+ lbp = lb_peer_find(sli, &ni->calling_addr);
+ if (!lbp) {
+ LOG_SCCP_LB(sli, LOGL_DEBUG, "(calling_addr=%s) N-NOTICE.ind cause=%u='%s' importance=%u didn't match any lb_peer, ignoring\n",
+ osmo_sccp_addr_dump(&ni->calling_addr),
+ ni->cause, osmo_sccp_return_cause_name(ni->cause),
+ ni->importance);
+ return;
+ }
+
+ LOG_LB_PEER(lbp, LOGL_NOTICE, "N-NOTICE.ind cause=%u='%s' importance=%u\n",
+ ni->cause, osmo_sccp_return_cause_name(ni->cause),
+ ni->importance);
+
+ switch (ni->cause) {
+ case SCCP_RETURN_CAUSE_SUBSYSTEM_CONGESTION:
+ case SCCP_RETURN_CAUSE_NETWORK_CONGESTION:
+ /* Transient failures (hopefully), keep going. */
+ return;
+ default:
+ break;
+ }
+
+ /* Messages are not arriving to lb_peer. Signal it is unavailable to update local state. */
+ osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_UNAVAILABLE, NULL);
+}
+
static void handle_pcstate_ind(struct sccp_lb_inst *sli, const struct osmo_scu_pcstate_param *pcst)
{
struct osmo_ss7_instance *cs7 = osmo_sccp_get_ss7(sli->sccp);
@@ -253,6 +283,11 @@
rc = lb_peer_up_l2(sli, peer_addr, false, 0, oph->msg);
break;
+ case OSMO_PRIM(OSMO_SCU_PRIM_N_NOTICE, PRIM_OP_INDICATION):
+ handle_notice_ind(sli, &prim->u.notice);
+ rc = 0;
+ break;
+
case OSMO_PRIM(OSMO_SCU_PRIM_N_PCSTATE, PRIM_OP_INDICATION):
handle_pcstate_ind(sli, &prim->u.pcstate);
rc = 0;
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