lokinet/llarp/vpn/i_packet_io.hpp

#pragma once
#include <llarp/net/ip_packet.hpp>
#include <llarp/util/types.hpp>

#include <functional>

namespace llarp::vpn
{
  class I_Packet_IO
  {
   public:
    virtual ~I_Packet_IO() = default;

    /// start any platform specific operations before running
    virtual void
    Start(){};

    /// stop operation and tear down anything that Start() set up.
    virtual void
    Stop(){};

    /// read next ip packet, return an empty packet if there are none ready.
    virtual net::IPPacket
    ReadNextPacket() = 0;

    /// write a packet to the interface
    /// returns false if we dropped it
    virtual bool
    WritePacket(net::IPPacket pkt) = 0;

    /// get pollable fd for reading
    virtual int
    PollFD() const = 0;
  };

}  // namespace llarp::vpn