zebra: Start breakup of zns into zrouter and zns

The `struct zebra_ns` data structure is being used
for both router information as well as support for
the vrf backend( as appropriate ).  This is a confusing
state.  Start the movement of `struct zebra_ns` into
2 things `struct zebra_router` and `struct zebra_ns`.

In this new regime `struct zebra_router` is purely
for handling data about the router.  It has no knowledge
of the underlying representation of the Data Plane.

`struct zebra_ns` becomes a linux specific bit of code
that allows us to handle the vrf backend and is allowed
to have knowledge about underlying data plane constructs.

When someone implements a *bsd backend the zebra_vrf data
structure will need to be abstracted to take advantage of this
instead of relying on zebra_ns.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/zebra/zebra_router.h b/zebra/zebra_router.h
new file mode 100644
index 0000000000..456f168227
--- /dev/null
+++ b/zebra/zebra_router.h
@@ -0,0 +1,71 @@
+/* Zebra Router header.
+ * Copyright (C) 2018 Cumulus Networks, Inc.
+ *                    Donald Sharp
+ *
+ * This file is part of FRR.
+ *
+ * FRR 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, or (at your option) any
+ * later version.
+ *
+ * FRR 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 FRR; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+#ifndef __ZEBRA_ROUTER_H__
+#define __ZEBRA_ROUTER_H__
+
+#include "zebra/zebra_ns.h"
+
+/*
+ * This header file contains the idea of a router and as such
+ * owns data that is associated with a router from zebra's
+ * perspective.
+ */
+
+struct zebra_router_table {
+	RB_ENTRY(zebra_router_table) zebra_router_table_entry;
+
+	uint32_t tableid;
+	afi_t afi;
+	safi_t safi;
+	ns_id_t ns_id;
+
+	struct route_table *table;
+};
+RB_HEAD(zebra_router_table_head, zebra_router_table);
+RB_PROTOTYPE(zebra_router_table_head, zebra_router_table,
+	     zebra_router_table_entry, zebra_router_table_entry_compare)
+
+struct zebra_router {
+
+	struct zebra_router_table_head tables;
+	/* L3-VNI hash table (for EVPN). Only in default instance */
+	struct hash *l3vni_table;
+};
+
+extern struct zebra_router zrouter;
+
+extern void zebra_router_init(void);
+extern void zebra_router_terminate(void);
+
+extern struct route_table *zebra_router_find_table(struct zebra_vrf *zvrf,
+						   uint32_t tableid, afi_t afi,
+						   safi_t safi);
+extern struct route_table *zebra_router_get_table(struct zebra_vrf *zvrf,
+						  uint32_t tableid, afi_t afi,
+						  safi_t safi);
+
+extern int zebra_router_config_write(struct vty *vty);
+
+extern unsigned long zebra_router_score_proto(uint8_t proto,
+					      unsigned short instance);
+extern void zebra_router_sweep_route(void);
+#endif