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osdep/NeighborDiscovery.hpp

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+/*
+ * Copyright (c)2019 ZeroTier, Inc.
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file in the project's root directory.
+ *
+ * Change Date: 2026-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2.0 of the Apache License.
+ */
+/****/
+
+#ifndef ZT_NEIGHBORDISCOVERY_HPP
+#define ZT_NEIGHBORDISCOVERY_HPP
+
+#include "../node/Hashtable.hpp"
+#include "../node/MAC.hpp"
+#include "../node/InetAddress.hpp"
+
+
+#define ZT_ND_QUERY_INTERVAL 2000
+
+#define ZT_ND_QUERY_MAX_TTL 5000
+
+#define ZT_ND_EXPIRE 600000
+
+
+namespace ZeroTier {
+
+class NeighborDiscovery
+{
+public:
+    NeighborDiscovery();
+
+    /**
+     * Set a local IP entry that we should respond to Neighbor Requests withPrefix64k
+     *
+     * @param mac Our local MAC address
+     * @param ip Our IPv6 address
+     */
+    void addLocal(const sockaddr_storage &address, const MAC &mac);
+
+    /**
+     * Delete a local IP entry or cached Neighbor entry
+     *
+     * @param address IPv6 address to remove
+     */
+    void remove(const sockaddr_storage &address);
+
+    sockaddr_storage processIncomingND(const uint8_t *nd, unsigned int len, const sockaddr_storage &localIp, uint8_t *response, unsigned int &responseLen, MAC &responseDest);
+
+    MAC query(const MAC &localMac, const sockaddr_storage &localIp, const sockaddr_storage &targetIp, uint8_t *query, unsigned int &queryLen, MAC &queryDest);
+
+private:
+    struct _NDEntry
+    {
+        _NDEntry() : lastQuerySent(0), lastResponseReceived(0), mac(), local(false) {}
+        uint64_t lastQuerySent;
+        uint64_t lastResponseReceived;
+        MAC mac;
+        bool local;
+    };
+
+    Hashtable<InetAddress, _NDEntry> _cache;
+    uint64_t _lastCleaned;
+};
+
+}  // namespace ZeroTier
+
+#endif