1 files changed, 101 insertions, 0 deletions
diff --git a/lib/srcdest_table.h b/lib/srcdest_table.h
new file mode 100644
index 0000000000..59111b5d17
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+++ b/lib/srcdest_table.h
@@ -0,0 +1,101 @@
+/*
+ * SRC-DEST Routing Table
+ *
+ * Copyright (C) 2017 by David Lamparter & Christian Franke,
+ *                       Open Source Routing / NetDEF Inc.
+ *
+ * This file is part of FreeRangeRouting (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_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"
+
+#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 prefix46ptr dst_pu,
+                                            struct prefix_ipv6 *src_p);
+extern struct route_node *srcdest_rnode_lookup(struct route_table *table,
+                                            union prefix46ptr dst_pu,
+                                            struct prefix_ipv6 *src_p);
+extern void srcdest_rnode_prefixes (struct route_node *rn, struct prefix **p,
+                                    struct prefix **src_p);
+extern const char *srcdest_rnode2str(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 (struct route_node *rn)
+{
+  return rn->table->delegate == &_srcdest_dstnode_delegate;
+}
+
+static inline int
+rnode_is_srcnode (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 = rn->table->info;
+      return dst_rn->table;
+    }
+  else
+    {
+      return rn->table;
+    }
+}
+static inline void *
+srcdest_rnode_table_info (struct route_node *rn)
+{
+  return srcdest_rnode_table(rn)->info;
+}
+
+#endif /* _ZEBRA_SRC_DEST_TABLE_H */