bsc: Look for location updating requests in messages
Introduce the SCCP connection data and remember that
we were seeing a location updating request from a
different LAC.
diff --git a/openbsc/src/bsc/osmo_bsc_filter.c b/openbsc/src/bsc/osmo_bsc_filter.c
index 1aeaa95..7052cfe 100644
--- a/openbsc/src/bsc/osmo_bsc_filter.c
+++ b/openbsc/src/bsc/osmo_bsc_filter.c
@@ -19,6 +19,34 @@
*/
#include <openbsc/osmo_bsc.h>
+#include <openbsc/debug.h>
+
+static void handle_lu_request(struct gsm_subscriber_connection *conn,
+ struct msgb *msg)
+{
+ struct gsm48_hdr *gh;
+ struct gsm48_loc_upd_req *lu;
+ struct gsm48_loc_area_id lai;
+ struct gsm_network *net;
+
+ if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*lu)) {
+ LOGP(DMSC, LOGL_ERROR, "LU too small to look at: %u\n", msgb_l3len(msg));
+ return;
+ }
+
+ net = conn->bts->network;
+
+ gh = msgb_l3(msg);
+ lu = (struct gsm48_loc_upd_req *) gh->data;
+
+ gsm48_generate_lai(&lai, net->country_code, net->network_code,
+ conn->bts->location_area_code);
+
+ if (memcmp(&lai, &lu->lai, sizeof(lai)) != 0) {
+ LOGP(DMSC, LOGL_DEBUG, "Marking con for welcome USSD.\n");
+ conn->sccp_con->new_subscriber = 1;
+ }
+}
/**
* This is used to scan a message for extra functionality of the BSC. This
@@ -27,5 +55,14 @@
*/
int bsc_scan_bts_msg(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ uint8_t pdisc = gh->proto_discr & 0x0f;
+ uint8_t mtype = gh->msg_type & 0xbf;
+
+ if (pdisc == GSM48_PDISC_MM) {
+ if (mtype == GSM48_MT_MM_LOC_UPD_REQUEST)
+ handle_lu_request(conn, msg);
+ }
+
return 0;
}