text: #pragma once
  
  #include <AK/ByteBuffer.h>
  #include <AK/Function.h>
  #include <AK/SinglyLinkedList.h>
  #include <AK/Types.h>
  #include <AK/Weakable.h>
  #include <AK/WeakPtr.h>
  #include <Kernel/KBuffer.h>
  #include <Kernel/Net/ARP.h>
  #include <Kernel/Net/ICMP.h>
  #include <Kernel/Net/IPv4.h>
  #include <Kernel/Net/MACAddress.h>
  
  class NetworkAdapter;
  
  class NetworkAdapter : public Weakable<NetworkAdapter> {
  public:
      static void for_each(Function<void(NetworkAdapter&)>);
      static WeakPtr<NetworkAdapter> from_ipv4_address(const IPv4Address&);
      static WeakPtr<NetworkAdapter> lookup_by_name(const StringView&);
      virtual ~NetworkAdapter();
  
      virtual const char* class_name() const = 0;
  
      const String& name() const { return m_name; }
      MACAddress mac_address() { return m_mac_address; }
      IPv4Address ipv4_address() const { return m_ipv4_address; }
      IPv4Address ipv4_netmask() const { return m_ipv4_netmask; }
      IPv4Address ipv4_gateway() const { return m_ipv4_gateway; }
      virtual bool link_up() { return false; }
  
      void set_ipv4_address(const IPv4Address&);
      void set_ipv4_netmask(const IPv4Address&);
      void set_ipv4_gateway(const IPv4Address&);
  
      void send(const MACAddress&, const ARPPacket&);
      void send_ipv4(const MACAddress&, const IPv4Address&, IPv4Protocol, const u8* payload, size_t payload_size, u8 ttl);
  
      Optional<KBuffer> dequeue_packet();
  
      bool has_queued_packets() const { return !m_packet_queue.is_empty(); }
  
      u32 mtu() const { return m_mtu; }
      void set_mtu(u32 mtu) { m_mtu = mtu; }
  
      u32 packets_in() const { return m_packets_in; }
      u32 bytes_in() const { return m_bytes_in; }
      u32 packets_out() const { return m_packets_out; }
      u32 bytes_out() const { return m_bytes_out; }
  
      Function<void()> on_receive;
  
  protected:
      NetworkAdapter();
      void set_interface_name(const StringView& basename);
      void set_mac_address(const MACAddress& mac_address) { m_mac_address = mac_address; }
      virtual void send_raw(const u8*, int) = 0;
      void did_receive(const u8*, int);
  
  private:
      MACAddress m_mac_address;
      IPv4Address m_ipv4_address;
      IPv4Address m_ipv4_netmask;
      IPv4Address m_ipv4_gateway;
      SinglyLinkedList<KBuffer> m_packet_queue;
      String m_name;
      u32 m_packets_in { 0 };
      u32 m_bytes_in { 0 };
      u32 m_packets_out { 0 };
      u32 m_bytes_out { 0 };
      u32 m_mtu { 1500 };
  };
  