1 files changed, 78 insertions, 0 deletions
diff --git a/lib/ldp_sync.c b/lib/ldp_sync.c
new file mode 100644
index 0000000..d55819d
--- /dev/null
+++ b/lib/ldp_sync.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ldp_sync.c: LDP-SYNC handling routines
+ * Copyright (C) 2020 Volta Networks, Inc.
+ */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "memory.h"
+#include "prefix.h"
+#include "log.h"
+#include "frrevent.h"
+#include "stream.h"
+#include "zclient.h"
+#include "table.h"
+#include "vty.h"
+#include "ldp_sync.h"
+
+/* Library code */
+DEFINE_MTYPE_STATIC(LIB, LDP_SYNC_INFO, "LDP SYNC info");
+
+/*
+ * ldp_sync_info_create - Allocate the LDP_SYNC information
+ */
+struct ldp_sync_info *ldp_sync_info_create(void)
+{
+	struct ldp_sync_info *ldp_sync_info;
+
+	ldp_sync_info = XCALLOC(MTYPE_LDP_SYNC_INFO,
+				sizeof(struct ldp_sync_info));
+	assert(ldp_sync_info);
+
+	ldp_sync_info->flags = 0;
+	ldp_sync_info->enabled = LDP_IGP_SYNC_DEFAULT;
+	ldp_sync_info->state = LDP_IGP_SYNC_STATE_NOT_REQUIRED;
+	ldp_sync_info->holddown = LDP_IGP_SYNC_HOLDDOWN_DEFAULT;
+	ldp_sync_info->t_holddown = NULL;
+	return ldp_sync_info;
+}
+
+/*
+ * ldp_sync_info_free - Free the LDP_SYNC information.
+ */
+void ldp_sync_info_free(struct ldp_sync_info **ldp_sync_info)
+{
+	if (*ldp_sync_info)
+		XFREE(MTYPE_LDP_SYNC_INFO, *ldp_sync_info);
+}
+
+bool ldp_sync_if_is_enabled(struct ldp_sync_info *ldp_sync_info)
+{
+	/* return true if LDP-SYNC is configured on this interface */
+	if (ldp_sync_info &&
+	    ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED &&
+	    ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP)
+		return true;
+
+	return false;
+}
+
+bool ldp_sync_if_down(struct ldp_sync_info *ldp_sync_info)
+{
+	/* Stop LDP-SYNC on this interface:
+	 *   if holddown timer is running stop it
+	 *   update state
+	 */
+	if (ldp_sync_info && ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED) {
+		EVENT_OFF(ldp_sync_info->t_holddown);
+
+		if (ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_UP)
+			ldp_sync_info->state =
+				LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP;
+		return true;
+	}
+
+	return false;
+}