NetArp.hpp

//------------------------------------------------------------------------------
//This file is part of embKernel. 
//See license.txt for the full license governing this code.
//------------------------------------------------------------------------------

#ifndef NET_ARP_HPP_
#define NET_ARP_HPP_

#include "NetDefs.hpp"
#include "NetCfg.hpp"
#include "RtosSemaphore.hpp"

class NetArp {
    friend class Net;
    friend class NetUdpSocket;
    friend class NetTcpSocket;
private:
    static const uint16_t TIMEOUT_SLOT_RESOLVING = 20; //in 0.1s unit
    static const uint16_t RETRIES_SLOT_RESOLVING = 3;
    static const uint16_t TIMEOUT_SLOT_VALID = 60 * 600; //in 0.1s unit
    typedef enum : uint16_t {
        SLOT_EMPTY = 0,
        SLOT_RESOLVING,
        SLOT_RESOLVED,
        SLOT_TIMEOUT,
        SLOT_VALID,
        SLOT_RESERVED
    } SLOT_STATUS;

    typedef struct tagSlot {
        uint32_t timer;
        RtosTask* task;
        NetDefs::IP_ADDR ipAddr;
        NetDefs::MAC_ADDR macAddr;
        SLOT_STATUS status;
        tagSlot() :
        status(SLOT_EMPTY) {
        }
    }__attribute__((packed)) SLOT;

    static SLOT sSlots[NET_CFG_MAX_ARP_ENTRIES];

    static SLOT* getFreeSlot();
    static SLOT* getWaitingSlot(const NetDefs::IP_ADDR ipAddr);
    static bool checkCache(const NetDefs::IP_ADDR& ipAddr, NetDefs::MAC_ADDR& macAddr);

    static void tick();

    static void processFrame(NetDefs::FRAME& frame, NetDefs::ARP_HEADER& header);
    static void send(NetDefs::FRAME& frame, const NetDefs::MAC_ADDR& macDst, const NetDefs::IP_ADDR& ipDst, const NetDefs::ARP_OPERATION op);
    static void swapHeader(NetDefs::ARP_HEADER& header);
    static bool resolve(NetDefs::IP_ADDR ipAddr, NetDefs::MAC_ADDR& macAddr);
};

#endif /* NET_ARP_HPP_ */