bssap: Detect BSC Osmux support on RESET (ACK) recv
Related: OS#2551
Depends: libosmocore.git I28f83e2e32b9533c99e65ccc1562900ac2aec74e
Change-Id: If4f33da9b414ab194098755d2c5be85e1fce5d31
diff --git a/src/libmsc/ran_peer.c b/src/libmsc/ran_peer.c
index 35f2842..ce26794 100644
--- a/src/libmsc/ran_peer.c
+++ b/src/libmsc/ran_peer.c
@@ -122,13 +122,41 @@
}
}
+/* TODO: create an sccp_ran_ops.rx_reset(_ack) to handle this differently on 2g and 3G */
+/* We expect RAN peer to provide use with an Osmocom extension TLV in BSSMAP_RESET to
+ * announce Osmux support */
+static void ran_peer_update_osmux_support(struct ran_peer *rp, struct msgb *msg)
+{
+ struct tlv_parsed tp;
+ int rc;
+ bool old_value = rp->remote_supports_osmux;
+
+ OSMO_ASSERT(msg);
+ msg->l3h = msg->l2h + sizeof(struct bssmap_header);
+ rc = tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0);
+ if (rc < 0)
+ LOG_RAN_PEER(rp, LOGL_NOTICE, "Failed parsing TLV looking for Osmux support\n");
+
+ if (TLVP_PRESENT(&tp, GSM0808_IE_OSMO_OSMUX_SUPPORT)) {
+ rp->remote_supports_osmux = true;
+ } else {
+ rp->remote_supports_osmux = false;
+ }
+
+ if (old_value != rp->remote_supports_osmux)
+ LOG_RAN_PEER(rp, LOGL_INFO, "BSC detected AoIP Osmux support changed: %d->%d\n",
+ old_value, rp->remote_supports_osmux);
+}
+
/* Drop all SCCP connections for this ran_peer, respond with RESET ACKNOWLEDGE and move to READY state. */
-static void ran_peer_rx_reset(struct ran_peer *rp)
+static void ran_peer_rx_reset(struct ran_peer *rp, struct msgb* msg)
{
struct msgb *reset_ack;
ran_peer_discard_all_conns(rp);
+ ran_peer_update_osmux_support(rp, msg);
+
reset_ack = rp->sri->ran->sccp_ran_ops.make_reset_msg(rp->sri, SCCP_RAN_MSG_RESET_ACK);
if (!reset_ack) {
@@ -152,9 +180,10 @@
ran_peer_state_chg(rp, RAN_PEER_ST_READY);
}
-static void ran_peer_rx_reset_ack(struct ran_peer *rp)
+static void ran_peer_rx_reset_ack(struct ran_peer *rp, struct msgb* msg)
{
ran_peer_state_chg(rp, RAN_PEER_ST_READY);
+ ran_peer_update_osmux_support(rp, msg);
}
void ran_peer_reset(struct ran_peer *rp)
@@ -228,6 +257,7 @@
{
struct ran_peer *rp = fi->priv;
struct ran_peer_ev_ctx *ctx;
+ struct msgb *msg;
switch (event) {
@@ -257,7 +287,8 @@
return;
case RAN_PEER_EV_RX_RESET:
- ran_peer_rx_reset(rp);
+ msg = (struct msgb*)data;
+ ran_peer_rx_reset(rp, msg);
return;
default:
@@ -270,11 +301,13 @@
{
struct ran_peer *rp = fi->priv;
struct ran_peer_ev_ctx *ctx;
+ struct msgb *msg;
switch (event) {
case RAN_PEER_EV_RX_RESET_ACK:
- ran_peer_rx_reset_ack(rp);
+ msg = (struct msgb*)data;
+ ran_peer_rx_reset_ack(rp, msg);
return;
case RAN_PEER_EV_MSG_UP_CO:
@@ -289,7 +322,8 @@
return;
case RAN_PEER_EV_RX_RESET:
- ran_peer_rx_reset(rp);
+ msg = (struct msgb*)data;
+ ran_peer_rx_reset(rp, msg);
return;
default:
@@ -330,6 +364,7 @@
struct ran_peer_ev_ctx *ctx;
struct ran_conn *conn;
struct an_apdu an_apdu;
+ struct msgb *msg;
switch (event) {
@@ -397,7 +432,8 @@
return;
case RAN_PEER_EV_RX_RESET:
- ran_peer_rx_reset(rp);
+ msg = (struct msgb*)data;
+ ran_peer_rx_reset(rp, msg);
return;
default: