From b8781d2cd5175c6de2d7fcb51bc3d736f309320b Mon Sep 17 00:00:00 2001
From: Holger Hans Peter Freyther <zecke@selfish.org>
Date: Sat, 6 Nov 2010 18:08:43 +0100
Subject: [PATCH] bsc: Start to open a SCCP connection and prepare timers and
 such.

---
 openbsc/include/openbsc/osmo_bsc.h | 10 +++++
 openbsc/src/bsc/osmo_bsc_sccp.c    | 62 ++++++++++++++++++++++++++++--
 2 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/openbsc/include/openbsc/osmo_bsc.h b/openbsc/include/openbsc/osmo_bsc.h
index 102aae127..1d68cbe0b 100644
--- a/openbsc/include/openbsc/osmo_bsc.h
+++ b/openbsc/include/openbsc/osmo_bsc.h
@@ -5,7 +5,17 @@
 
 #include "bsc_api.h"
 
+struct sccp_connection;
+
 struct osmo_bsc_sccp_con {
+	struct llist_head entry;
+
+	/* SCCP connection realted */
+	struct sccp_connection *sccp;
+	struct bsc_msc_connection *msc_con;
+	struct timer_list sccp_it_timeout;
+	struct timer_list sccp_cc_timeout;
+
 	uint8_t new_subscriber;
 };
 
diff --git a/openbsc/src/bsc/osmo_bsc_sccp.c b/openbsc/src/bsc/osmo_bsc_sccp.c
index d1fff9148..620082f80 100644
--- a/openbsc/src/bsc/osmo_bsc_sccp.c
+++ b/openbsc/src/bsc/osmo_bsc_sccp.c
@@ -21,6 +21,8 @@
  */
 
 #include <openbsc/gsm_data.h>
+#include <openbsc/osmo_bsc.h>
+#include <openbsc/osmo_bsc_grace.h>
 #include <openbsc/osmo_msc_data.h>
 #include <openbsc/debug.h>
 
@@ -30,6 +32,17 @@
 
 #include <osmocom/sccp/sccp.h>
 
+static LLIST_HEAD(active_connections);
+
+static void msc_outgoing_sccp_data(struct sccp_connection *conn,
+				   struct msgb *msg, unsigned int len)
+{
+}
+
+static void msc_outgoing_sccp_state(struct sccp_connection *conn, int old_state)
+{
+}
+
 static void msc_sccp_write_ipa(struct sccp_connection *conn, struct msgb *msg, void *data)
 {
 	LOGP(DMSC, LOGL_ERROR, "Writing is not implemented.\n");
@@ -78,8 +91,44 @@ int bsc_queue_for_msc(struct gsm_subscriber_connection *conn, struct msgb *msg)
 
 int bsc_create_new_connection(struct gsm_subscriber_connection *conn)
 {
-	LOGP(DMSC, LOGL_ERROR, "Not implemented yet.\n");
-	return -1;
+	struct gsm_network *net;
+	struct osmo_bsc_sccp_con *bsc_con;
+	struct sccp_connection *sccp;
+
+	net = conn->bts->network;
+	if (!net->msc_data->msc_con->is_authenticated) {
+		LOGP(DMSC, LOGL_ERROR, "Not connected to a MSC. Not forwarding data.\n");
+		return -1;
+	}
+
+	if (!bsc_grace_allow_new_connection(net)) {
+		LOGP(DMSC, LOGL_NOTICE, "BSC in grace period. No new connections.\n");
+		return -1;
+	}
+
+	sccp = sccp_connection_socket();
+	if (!sccp) {
+		LOGP(DMSC, LOGL_ERROR, "Failed to allocate memory.\n");
+		return -ENOMEM;
+	}
+
+	bsc_con = talloc_zero(conn->bts, struct osmo_bsc_sccp_con);
+	if (!bsc_con) {
+		LOGP(DMSC, LOGL_ERROR, "Failed to allocate.\n");
+		sccp_connection_free(sccp);
+		return -1;
+	}
+
+	/* callbacks */
+	sccp->state_cb = msc_outgoing_sccp_state;
+	sccp->data_cb = msc_outgoing_sccp_data;
+	sccp->data_ctx = bsc_con;
+
+	bsc_con->sccp = sccp;
+	bsc_con->msc_con = net->msc_data->msc_con;
+	llist_add(&bsc_con->entry, &active_connections);
+	conn->sccp_con = bsc_con;
+	return 0;
 }
 
 int bsc_open_connection(struct gsm_subscriber_connection *conn, struct msgb *msg)
@@ -90,10 +139,15 @@ int bsc_open_connection(struct gsm_subscriber_connection *conn, struct msgb *msg
 
 int bsc_delete_connection(struct gsm_subscriber_connection *conn)
 {
-	if (!conn->sccp_con)
+	struct osmo_bsc_sccp_con *sccp = conn->sccp_con;
+
+	if (!sccp)
 		return 0;
 
-	talloc_free(conn->sccp_con);
+	llist_del(&sccp->entry);
+	bsc_del_timer(&sccp->sccp_it_timeout);
+	bsc_del_timer(&sccp->sccp_cc_timeout);
+	talloc_free(sccp);
 	conn->sccp_con = NULL;
 	return 0;
 }