P2P_Mac.c

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/************************************************************************************
* Copyright (C) 2021                                                                *
* TETCOS, Bangalore. India                                                          *
*                                                                                   *
* Tetcos owns the intellectual property rights in the Product and its content.      *
* The copying, redistribution, reselling or publication of any or all of the        *
* Product or its content without express prior written consent of Tetcos is         *
* prohibited. Ownership and / or any other right relating to the software and all   *
* intellectual property rights therein shall remain at all times with Tetcos.       *
*                                                                                   *
* This source code is licensed per the NetSim license agreement.                    *
*                                                                                   *
* No portion of this source code may be used as the basis for a derivative work,    *
* or used, for any purpose other than its intended use per the NetSim license       *
* agreement.                                                                        *
*                                                                                   *
* This source code and the algorithms contained within it are confidential trade    *
* secrets of TETCOS and may not be used as the basis for any other software,        *
* hardware, product or service.                                                     *
*                                                                                   *
* Author:    Shashi Kant Suman                                                      *
*                                                                                   *
* ----------------------------------------------------------------------------------*/
#include "main.h"
#include "P2P.h"
#include "P2P_Enum.h"
 
int P2P_MacOut_Handler()
{
    NETSIM_ID d = pstruEventDetails->nDeviceId;
    NETSIM_ID in = pstruEventDetails->nInterfaceId;
 
    NetSim_BUFFER* buf = DEVICE_ACCESSBUFFER(d, in);
    NetSim_PACKET* pstruPacket;
    
    if (pstruEventDetails->nSubEventType == P2P_MAC_IDLE)
    {
        P2P_MAC_SET_IDLE(d, in);
        pstruEventDetails->nSubEventType = 0;
    }
 
    if (P2P_MAC_IS_BUSY(d, in)) return -1; // Mac is busy.
 
    //Get the packet from the Interface buffer
    pstruPacket = fn_NetSim_Packet_GetPacketFromBuffer(buf, 1);
    if (!pstruPacket)   return -2;
 
    fnValidatePacket(pstruPacket);
 
    P2P_MAC_SET_BUSY(d, in);
 
    //Place the packet to physical layer
    //Write physical out event.
    //Append mac details in packet
    pstruPacket->pstruMacData->dArrivalTime = ldEventTime;
    pstruPacket->pstruMacData->dEndTime = ldEventTime;
    if (pstruPacket->pstruNetworkData)
    {
        pstruPacket->pstruMacData->dOverhead = 0;
        pstruPacket->pstruMacData->dPayload = pstruPacket->pstruNetworkData->dPacketSize;
        pstruPacket->pstruMacData->dPacketSize = pstruPacket->pstruMacData->dOverhead +
            pstruPacket->pstruMacData->dPayload;
    }
    if (pstruPacket->pstruMacData->Packet_MACProtocol &&
        !pstruPacket->pstruMacData->dontFree)
    {
        fn_NetSim_Packet_FreeMacProtocolData(pstruPacket);
        pstruPacket->pstruMacData->Packet_MACProtocol = NULL;
    }
    pstruPacket->pstruMacData->nMACProtocol = pstruEventDetails->nProtocolId;
    pstruPacket->pstruMacData->dStartTime = ldEventTime;
    //Update the event details
    pstruEventDetails->dEventTime = ldEventTime;
    pstruEventDetails->nEventType = PHYSICAL_OUT_EVENT;
    pstruEventDetails->pPacket = pstruPacket;
    pstruEventDetails->nPacketId = pstruPacket->nPacketId;
    if (pstruPacket->pstruAppData)
    {
        pstruEventDetails->nApplicationId = pstruPacket->pstruAppData->nApplicationId;
        pstruEventDetails->nSegmentId = pstruPacket->pstruAppData->nSegmentId;
    }
    else
    {
        pstruEventDetails->nApplicationId = 0;
        pstruEventDetails->nSegmentId = 0;
    }
    //Add physical out event
    fnpAddEvent(pstruEventDetails);
    return 0;
}
 
int P2P_MacIn_Handler()
{
    NETSIM_ID d = pstruEventDetails->nDeviceId;
    NETSIM_ID in = pstruEventDetails->nInterfaceId;
    NetSim_PACKET* packet = pstruEventDetails->pPacket;
    if (DEVICE_NWLAYER(d))
    {
        //Add packet to Network in
        //Prepare event details for network in
        pstruEventDetails->dEventTime = ldEventTime;
        pstruEventDetails->nEventType = NETWORK_IN_EVENT;
        pstruEventDetails->nProtocolId = fn_NetSim_Stack_GetNWProtocol(d);
        //Add network in event
        fnpAddEvent(pstruEventDetails);
    }
    else
    {
        bool isTransmitted = false;
        //Broadcast to all other interface
        NETSIM_ID i;
        for (i = 0; i < DEVICE(d)->nNumOfInterface; i++)
        {
            if (i + 1 == in)
                continue;
 
            NetSim_BUFFER* buf = DEVICE_ACCESSBUFFER(d, i + 1);
            //Check for buffer
            if (!fn_NetSim_GetBufferStatus(buf))
            {
                //Prepare event details for mac out
                pstruEventDetails->dEventTime = ldEventTime;
                pstruEventDetails->nEventType = MAC_OUT_EVENT;
                pstruEventDetails->nInterfaceId = i + 1;
                pstruEventDetails->pPacket = NULL;
                pstruEventDetails->nProtocolId = fn_NetSim_Stack_GetMacProtocol(d, i + 1);
                //Add mac out event
                fnpAddEvent(pstruEventDetails);
            }
            //Add packet to mac buffer
            fn_NetSim_Packet_AddPacketToList(buf,
                                             isTransmitted == false ? packet : fn_NetSim_Packet_CopyPacket(packet), 0);
            isTransmitted = true;
        }
    }
    return 0;
}