1 files changed, 109 insertions, 0 deletions
diff --git a/lib/srcdest_table.h b/lib/srcdest_table.h
new file mode 100644
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--- /dev/null
+++ b/lib/srcdest_table.h
@@ -0,0 +1,109 @@
+/*
+ * SRC-DEST Routing Table
+ *
+ * Copyright (C) 2017 by David Lamparter & Christian Franke,
+ *                       Open Source Routing / NetDEF Inc.
+ *
+ * This file is part of FRRouting (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 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 _ZEBRA_SRC_DEST_TABLE_H
+#define _ZEBRA_SRC_DEST_TABLE_H
+
+/* old/IPv4/non-srcdest:
+ * table -> route_node .info -> [obj]
+ *
+ * new/IPv6/srcdest:
+ * table -...-> srcdest_rnode [prefix = dest] .info -> [obj]
+ *                                            .src_table ->
+ *         srcdest table -...-> route_node [prefix = src] .info -> [obj]
+ *
+ * non-srcdest routes (src = ::/0) are treated just like before, their
+ * information being directly there in the info pointer.
+ *
+ * srcdest routes are found by looking up destination first, then looking
+ * up the source in the "src_table".  src_table contains normal route_nodes,
+ * whose prefix is the _source_ prefix.
+ *
+ * NB: info can be NULL on the destination rnode, if there are only srcdest
+ * routes for a particular destination prefix.
+ */
+
+#include "prefix.h"
+#include "table.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SRCDEST2STR_BUFFER (2*PREFIX2STR_BUFFER + sizeof(" from "))
+
+/* extended route node for IPv6 srcdest routing */
+struct srcdest_rnode;
+
+extern route_table_delegate_t _srcdest_dstnode_delegate;
+extern route_table_delegate_t _srcdest_srcnode_delegate;
+
+extern struct route_table *srcdest_table_init(void);
+extern struct route_node *srcdest_rnode_get(struct route_table *table,
+					    union prefixconstptr dst_pu,
+					    const struct prefix_ipv6 *src_p);
+extern struct route_node *srcdest_rnode_lookup(struct route_table *table,
+					       union prefixconstptr dst_pu,
+					       const struct prefix_ipv6 *src_p);
+extern void srcdest_rnode_prefixes(const struct route_node *rn,
+				   const struct prefix **p,
+				   const struct prefix **src_p);
+extern const char *srcdest2str(const struct prefix *dst_p,
+			       const struct prefix_ipv6 *src_p,
+			       char *str, int size);
+extern const char *srcdest_rnode2str(const struct route_node *rn, char *str,
+				     int size);
+extern struct route_node *srcdest_route_next(struct route_node *rn);
+
+static inline int rnode_is_dstnode(const struct route_node *rn)
+{
+	return rn->table->delegate == &_srcdest_dstnode_delegate;
+}
+
+static inline int rnode_is_srcnode(const struct route_node *rn)
+{
+	return rn->table->delegate == &_srcdest_srcnode_delegate;
+}
+
+static inline struct route_table *srcdest_rnode_table(struct route_node *rn)
+{
+	if (rnode_is_srcnode(rn)) {
+		struct route_node *dst_rn =
+			(struct route_node *)route_table_get_info(rn->table);
+		return dst_rn->table;
+	} else {
+		return rn->table;
+	}
+}
+static inline void *srcdest_rnode_table_info(struct route_node *rn)
+{
+	return route_table_get_info(srcdest_rnode_table(rn));
+}
+
+extern struct route_table *srcdest_srcnode_table(struct route_node *rn);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ZEBRA_SRC_DEST_TABLE_H */