osmo-msc: finish msc-sided reset

finish the implementation for msc sided reset, automatically
register connecting BSCs.

Ensure that all sccp connections are cleared when the reset
procedure executes.

Change-Id: Iba3f5523795c6972600bbfda2a02b06ba84ea12d

1 files changed, 37 insertions, 1 deletions

diff --git a/include/openbsc/a_iface.h b/include/openbsc/a_iface.h
index b27c3db83..4a9eaf620 100644
--- a/include/openbsc/a_iface.h
+++ b/include/openbsc/a_iface.h
@@ -18,6 +18,36 @@
  *
  */
 
+#pragma once
+
+#include <openbsc/a_reset.h>
+
+/* A struct to keep a context information about the BSCs we are associated with */
+struct bsc_context {
+	struct llist_head list;
+
+	/* Holds a copy of the sccp address of the BSC,
+	 * this address will become known as soon as
+	 * a remote BSC tries to make a connection or
+	 * sends a RESET request via UNIDATA */
+	struct osmo_sccp_addr bsc_addr;
+
+	/* Holds a copy of the our local MSC address,
+	 * this will be the sccp-address that is associated
+	 * with the A interface */
+	struct osmo_sccp_addr msc_addr;
+
+	/* A pointer to the reset handler FSM, the
+	 * state machine is allocated when the BSC
+	 * is registerd. */
+	struct a_reset_ctx *reset;
+
+	/* A pointer to the sccp_user that is associated
+	 * with the A interface. We need this information
+	 * to send the resets and to send paging requests */
+	struct osmo_sccp_user *sccp_user;
+};
+
 /* Initalize A interface connection between to MSC and BSC */
 int a_init(void *ctx, struct osmo_sccp_instance *sccp, struct gsm_network *network);
 
@@ -34,4 +64,10 @@ int a_iface_tx_paging(const char *imsi, uint32_t tmsi, uint16_t lac);
 /* Send assignment request via A-interface */
 int a_iface_tx_assignment(struct gsm_trans *trans);
 
-#pragma once
+/* Clear all subscriber connections on a specified BSC
+ * (Helper function for a_iface_bssap.c) */
+void a_clear_all(struct osmo_sccp_user *scu, struct osmo_sccp_addr *bsc_addr);
+
+/* Delete info of a closed connection from the active connection list
+ * (Helper function for a_iface_bssap.c) */
+void a_delete_bsc_con(uint32_t conn_id);