gsm_subscriber_connection: further split between BSC and MSC

Move some Iu/A members into the MSC #ifdef.

Have separate allocate and free functions for the two scopes.

openbsc/include/openbsc/gsm_data.h

@@ -135,14 +135,6 @@ struct gsm_subscriber_connection {
 	/* back pointers */
 	struct gsm_network *network;
 
-	/* 2G or 3G? See enum interface_type */
-	int via_iface;
-
-	/* which Iu-CS connection, if any. */
-	struct {
-		struct ue_conn_ctx *ue_ctx;
-	} iu;
-
 	/* The BSC used to be an integral part of OsmoNITB. In OsmoCSCN, the
 	 * BSC and/or RNC is a separate entity, and no back pointers to the bts
 	 * and lchan structures are available. To facilitate separation of the
@@ -152,6 +144,15 @@ struct gsm_subscriber_connection {
 	int in_release;
 	uint16_t lac;
 	struct gsm_encr encr;
+
+	/* 2G or 3G? See enum interface_type */
+	int via_iface;
+
+	/* which Iu-CS connection, if any. */
+	struct {
+		struct ue_conn_ctx *ue_ctx;
+	} iu;
+
 #else
 	struct gsm_bts *bts;
 	struct gsm_lchan *lchan;
@@ -243,6 +244,12 @@ struct gsm_tz {
 };
 
 struct gsm_network {
+	/* TODO MSCSPLIT the gsm_network struct is basically a kitchen sink for
+	 * global settings and variables, "madly" mixing BSC and MSC stuff. Split
+	 * this in e.g. struct osmo_bsc and struct osmo_msc, with the things
+	 * these have in common, like country and network code, put in yet
+	 * separate structs and placed as members in osmo_bsc and osmo_msc. */
+
 	/* global parameters */
 	uint16_t country_code;
 	uint16_t network_code;
@@ -477,8 +484,11 @@ void gprs_ra_id_by_bts(struct gprs_ra_id *raid, struct gsm_bts *bts);
 int gsm_btsmodel_set_feature(struct gsm_bts_model *model, enum gsm_bts_features feat);
 int gsm_bts_model_register(struct gsm_bts_model *model);
 
-struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan);
-void subscr_con_free(struct gsm_subscriber_connection *conn);
+struct gsm_subscriber_connection *bsc_subscr_con_allocate(struct gsm_lchan *lchan);
+void bsc_subscr_con_free(struct gsm_subscriber_connection *conn);
+
+struct gsm_subscriber_connection *msc_subscr_con_allocate(struct gsm_network *network);
+void msc_subscr_con_free(struct gsm_subscriber_connection *conn);
 
 struct gsm_bts *gsm_bts_alloc_register(struct gsm_network *net,
 					enum gsm_bts_type type,

openbsc/src/libbsc/bsc_api.c

@@ -240,11 +240,7 @@ static int handle_new_assignment(struct gsm_subscriber_connection *conn, int cha
 	return 0;
 }
 
-/* Allocate a subscriber connection for A-interface link. For Iu-CS see
- * subscr_con_allocate_iu(). */
-/* TODO this shall move to libmsc, behind an actual A-interface, and lchan will
- * not be involved. */
-struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan)
+struct gsm_subscriber_connection *bsc_subscr_con_allocate(struct gsm_lchan *lchan)
 {
 	struct gsm_subscriber_connection *conn;
 	struct gsm_network *network = lchan->ts->trx->bts->network;
@@ -256,15 +252,13 @@ struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan)
 	/* Configure the time and start it so it will be closed */
 	/* FIXME: above comment is weird in at least two ways */
 	conn->network = network;
-	conn->via_iface = IFACE_A;
 	conn->lchan = lchan;
 	lchan->conn = conn;
 	llist_add_tail(&conn->entry, &network->subscr_conns);
 	return conn;
 }
 
-/* TODO: move subscriber put here... */
-void subscr_con_free(struct gsm_subscriber_connection *conn)
+void bsc_subscr_con_free(struct gsm_subscriber_connection *conn)
 {
 	if (!conn)
 		return;
@@ -688,7 +682,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
 	} else {
 		/* allocate a new connection */
 		rc = BSC_API_CONN_POL_REJECT;
-		lchan->conn = subscr_con_allocate(msg->lchan);
+		lchan->conn = bsc_subscr_con_allocate(msg->lchan);
 		if (!lchan->conn) {
 			lchan_release(lchan, 1, RSL_REL_NORMAL);
 			return -1;
@@ -699,7 +693,7 @@ int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id)
 
 		if (rc != BSC_API_CONN_POL_ACCEPT) {
 			lchan->conn->lchan = NULL;
-			subscr_con_free(lchan->conn);
+			bsc_subscr_con_free(lchan->conn);
 			lchan_release(lchan, 1, RSL_REL_NORMAL);
 		}
 	}
@@ -857,7 +851,7 @@ static void handle_release(struct gsm_subscriber_connection *conn,
 	gsm0808_clear(conn);
 
 	if (destruct)
-		subscr_con_free(conn);
+		bsc_subscr_con_free(conn);
 }
 
 static void handle_chan_ack(struct gsm_subscriber_connection *conn,

openbsc/src/libmsc/gsm_subscriber.c

@@ -370,3 +370,31 @@ void subscr_expire(struct gsm_subscriber_group *sgrp)
 {
 	db_subscriber_expire(sgrp->net, subscr_expire_callback);
 }
+
+struct gsm_subscriber_connection *msc_subscr_con_allocate(struct gsm_network *network)
+{
+	struct gsm_subscriber_connection *conn;
+
+	conn = talloc_zero(network, struct gsm_subscriber_connection);
+	if (!conn)
+		return NULL;
+
+	conn->network = network;
+	llist_add_tail(&conn->entry, &network->subscr_conns);
+	return conn;
+}
+
+void msc_subscr_con_free(struct gsm_subscriber_connection *conn)
+{
+	if (!conn)
+		return;
+
+
+	if (conn->subscr) {
+		subscr_put(conn->subscr);
+		conn->subscr = NULL;
+	}
+
+	llist_del(&conn->entry);
+	talloc_free(conn);
+}

openbsc/src/libmsc/iu_cs.c

@@ -95,7 +95,7 @@ int gsm0408_rcvmsg_iucs(struct gsm_network *network, struct msgb *msg)
 
 		rc = msc_compl_l3(conn, msg, 0);
 		if (rc != MSC_CONN_ACCEPT) {
-			subscr_con_free(conn);
+			msc_subscr_con_free(conn);
 			rc = -1;
 		}
 		else

openbsc/src/libmsc/osmo_msc.c

@@ -151,6 +151,5 @@ void msc_release_connection(struct gsm_subscriber_connection *conn)
 		subscr_update_expire_lu(conn->network, conn->subscr);
 
 	conn->in_release = 1;
-	gsm0808_clear(conn);
-	subscr_con_free(conn);
+	msc_subscr_con_free(conn);
 }

openbsc/src/osmo-bsc/osmo_bsc_api.c

@@ -330,7 +330,7 @@ static int move_to_msc(struct gsm_subscriber_connection *_conn,
 	_conn->sccp_con = NULL;
 	if (complete_layer3(_conn, msg, msc) != BSC_API_CONN_POL_ACCEPT) {
 		gsm0808_clear(_conn);
-		subscr_con_free(_conn);
+		bsc_subscr_con_free(_conn);
 		return 1;
 	}
 

openbsc/src/osmo-bsc/osmo_bsc_bssap.c

@@ -185,7 +185,7 @@ static int bssmap_handle_clear_command(struct osmo_bsc_sccp_con *conn,
 	if (conn->conn) {
 		LOGP(DMSC, LOGL_INFO, "Releasing all transactions on %p\n", conn);
 		gsm0808_clear(conn->conn);
-		subscr_con_free(conn->conn);
+		bsc_subscr_con_free(conn->conn);
 		conn->conn = NULL;
 	}
 

openbsc/src/osmo-bsc/osmo_bsc_sccp.c

@@ -84,7 +84,7 @@ static void msc_outgoing_sccp_state(struct sccp_connection *conn, int old_state)
 			LOGP(DMSC, LOGL_ERROR,
 				"ERROR: The lchan is still associated.\n");
 			gsm0808_clear(con_data->conn);
-			subscr_con_free(con_data->conn);
+			bsc_subscr_con_free(con_data->conn);
 			con_data->conn = NULL;
 		}
 
@@ -107,7 +107,7 @@ static void bsc_sccp_force_free(struct osmo_bsc_sccp_con *data)
 {
 	if (data->conn) {
 		gsm0808_clear(data->conn);
-		subscr_con_free(data->conn);
+		bsc_subscr_con_free(data->conn);
 		data->conn = NULL;
 	}