serenity/Kernel/Net/ARP.h

#pragma once

#include <Kernel/Net/MACAddress.h>
#include <Kernel/Net/IPv4.h>
#include <Kernel/Net/EtherType.h>

struct ARPOperation {
enum : word {
    Request = 1,
    Response = 2,
};
};

struct ARPHardwareType {
enum : word {
    Ethernet = 1,
};
};

class [[gnu::packed]] ARPPacket {
public:
    word hardware_type() const { return ntohs(m_hardware_type); }
    void set_hardware_type(word w) { m_hardware_type = htons(w); }

    word protocol_type() const { return ntohs(m_protocol_type); }
    void set_protocol_type(word w) { m_protocol_type = htons(w); }

    byte hardware_address_length() const { return m_hardware_address_length; }
    void set_hardware_address_length(byte b) { m_hardware_address_length = b; }

    byte protocol_address_length() const { return m_protocol_address_length; }
    void set_protocol_address_length(byte b) { m_protocol_address_length = b; }

    word operation() const { return ntohs(m_operation); }
    void set_operation(word w) { m_operation = htons(w); }

    const MACAddress& sender_hardware_address() const { return m_sender_hardware_address; }
    void set_sender_hardware_address(const MACAddress& address) { m_sender_hardware_address = address; }

    const IPv4Address& sender_protocol_address() const { return m_sender_protocol_address; }
    void set_sender_protocol_address(const IPv4Address& address) { m_sender_protocol_address = address; }

    const MACAddress& target_hardware_address() const { return m_target_hardware_address; }
    void set_target_hardware_address(const MACAddress& address) { m_target_hardware_address = address; }

    const IPv4Address& target_protocol_address() const { return m_target_protocol_address; }
    void set_target_protocol_address(const IPv4Address& address) { m_target_protocol_address = address; }

private:
    word m_hardware_type { 0x0100 };
    word m_protocol_type { 0x0008 };
    byte m_hardware_address_length { sizeof(MACAddress) };
    byte m_protocol_address_length { sizeof(IPv4Address) };
    word m_operation { 0 };
    MACAddress m_sender_hardware_address;
    IPv4Address m_sender_protocol_address;
    MACAddress m_target_hardware_address;
    IPv4Address m_target_protocol_address;
};

static_assert(sizeof(ARPPacket) == 28);