1 files changed, 68 insertions, 0 deletions
diff --git a/zebra/zebra_nhg_private.h b/zebra/zebra_nhg_private.h
new file mode 100644
index 0000000..2f4a92f
--- /dev/null
+++ b/zebra/zebra_nhg_private.h
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Nexthop Group Private Functions.
+ * Copyright (C) 2019 Cumulus Networks, Inc.
+ *                    Stephen Worley
+ */
+
+/**
+ * These functions should only be used internally for nhg_hash_entry
+ * manipulation and in certain special cases.
+ *
+ * Please use `zebra/zebra_nhg.h` for any general nhg_hash_entry api needs.
+ */
+
+#ifndef __ZEBRA_NHG_PRIVATE_H__
+#define __ZEBRA_NHG_PRIVATE_H__
+
+#include "zebra/zebra_nhg.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Abstraction for connected trees */
+struct nhg_connected {
+	struct nhg_connected_tree_item tree_item;
+	struct nhg_hash_entry *nhe;
+};
+
+static int nhg_connected_cmp(const struct nhg_connected *con1,
+			     const struct nhg_connected *con2)
+{
+	return (con1->nhe->id - con2->nhe->id);
+}
+
+DECLARE_RBTREE_UNIQ(nhg_connected_tree, struct nhg_connected, tree_item,
+		    nhg_connected_cmp);
+
+/* nhg connected tree direct access functions */
+extern void nhg_connected_tree_init(struct nhg_connected_tree_head *head);
+extern void nhg_connected_tree_free(struct nhg_connected_tree_head *head);
+extern bool
+nhg_connected_tree_is_empty(const struct nhg_connected_tree_head *head);
+extern struct nhg_connected *
+nhg_connected_tree_root(struct nhg_connected_tree_head *head);
+
+/* I realize _add/_del returns are backwords.
+ *
+ * Currently the list APIs are not standardized for what happens in
+ * the _del() function when the item isn't present.
+ *
+ * We are choosing to return NULL if not found in the _del case for now.
+ */
+
+/* Delete NHE from the tree. On success, return the NHE, otherwise NULL. */
+extern struct nhg_hash_entry *
+nhg_connected_tree_del_nhe(struct nhg_connected_tree_head *head,
+			   struct nhg_hash_entry *nhe);
+/* ADD NHE to the tree. On success, return NULL, otherwise return the NHE. */
+extern struct nhg_hash_entry *
+nhg_connected_tree_add_nhe(struct nhg_connected_tree_head *head,
+			   struct nhg_hash_entry *nhe);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ZEBRA_NHG_PRIVATE_H__ */