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diff --git a/lib/orr_msg.h b/lib/orr_msg.h
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+/*
+ * Structures common to BGP, OSPF and ISIS for BGP Optimal Route Reflection
+ * Copyright (C) 2021 Samsung R&D Institute India - Bangalore.
+ * Madhurilatha Kuruganti
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _FRR_ORR_MSG_H
+#define _FRR_ORR_MSG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* REVISIT: Need to check if we can use zero length array */
+#define ORR_MAX_PREFIX 100
+
+struct orr_prefix_metric {
+ struct prefix prefix;
+ uint32_t metric;
+};
+
+/* BGP-IGP Register for IGP metric */
+struct orr_igp_metric_reg {
+ bool reg;
+ uint8_t proto;
+ safi_t safi;
+ struct prefix prefix;
+};
+
+/* IGP-BGP message structures */
+struct orr_igp_metric_info {
+ /* IGP instance data. */
+ uint8_t proto;
+ uint32_t instId;
+
+ safi_t safi;
+
+ /* IGP metric from Active Root. */
+ struct prefix root;
+ uint32_t num_entries;
+ struct orr_prefix_metric nexthop[ORR_MAX_PREFIX];
+};
+
+/* BGP ORR Root node */
+struct orr_root {
+ afi_t afi;
+ safi_t safi;
+
+ /* MPLS_TE prefix and router ID */
+ struct prefix prefix;
+ struct in_addr router_id;
+
+ /* Advertising OSPF Router ID. */
+ struct in_addr adv_router;
+
+ /* BGP-ORR Received LSAs */
+ struct ospf_lsa *router_lsa_rcvd;
+
+ /* Routing tables from root node */
+ struct route_table *old_table; /* Old routing table. */
+ struct route_table *new_table; /* Current routing table. */
+
+ struct route_table *old_rtrs; /* Old ABR/ASBR RT. */
+ struct route_table *new_rtrs; /* New ABR/ASBR RT. */
+};
+
+/* Prototypes. */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FRR_ORR_MSG_H */