Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/lib/srcdest_table.h b/lib/srcdest_table.h
new file mode 100644
index 0000000..ff97f9b
--- /dev/null
+++ b/lib/srcdest_table.h
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * SRC-DEST Routing Table
+ *
+ * Copyright (C) 2017 by David Lamparter & Christian Franke,
+ *                       Open Source Routing / NetDEF Inc.
+ *
+ * This file is part of FRRouting (FRR)
+ */
+
+#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 */