ZeroTierOne/osdep/LinuxEthernetTap.hpp

/*
 * 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_LINUXETHERNETTAP_HPP
#define ZT_LINUXETHERNETTAP_HPP

#include "../node/MulticastGroup.hpp"
#include "BlockingQueue.hpp"
#include "EthernetTap.hpp"

#include <array>
#include <atomic>
#include <mutex>
#include <stdexcept>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <thread>
#include <vector>

namespace ZeroTier {

class LinuxEthernetTap : public EthernetTap {
  public:
    LinuxEthernetTap(
        const char* homePath,
        unsigned int concurrency,
        bool pinning,
        const MAC& mac,
        unsigned int mtu,
        unsigned int metric,
        uint64_t nwid,
        const char* friendlyName,
        void (*handler)(void*, void*, uint64_t, const MAC&, const MAC&, unsigned int, unsigned int, const void*, unsigned int),
        void* arg);

    virtual ~LinuxEthernetTap();

    virtual void setEnabled(bool en);
    virtual bool enabled() const;
    virtual bool addIp(const InetAddress& ip);
    virtual bool addIps(std::vector<InetAddress> ips);
    virtual bool removeIp(const InetAddress& ip);
    virtual std::vector<InetAddress> ips() const;
    virtual void put(const MAC& from, const MAC& to, unsigned int etherType, const void* data, unsigned int len);
    virtual std::string deviceName() const;
    virtual void setFriendlyName(const char* friendlyName);
    virtual void scanMulticastGroups(std::vector<MulticastGroup>& added, std::vector<MulticastGroup>& removed);
    virtual void setMtu(unsigned int mtu);
    virtual void setDns(const char* domain, const std::vector<InetAddress>& servers)
    {
    }

  private:
    void (*_handler)(void*, void*, uint64_t, const MAC&, const MAC&, unsigned int, unsigned int, const void*, unsigned int);
    void* _arg;
    uint64_t _nwid;
    MAC _mac;
    std::string _homePath;
    std::string _dev;
    std::vector<MulticastGroup> _multicastGroups;
    unsigned int _mtu;
    int _fd;
    int _shutdownSignalPipe[2];
    std::atomic_bool _enabled;
    std::atomic_bool _run;
    mutable std::vector<InetAddress> _ifaddrs;
    mutable uint64_t _lastIfAddrsUpdate;
    std::vector<std::thread> _rxThreads;
};

}   // namespace ZeroTier

#endif