DSR.c

/************************************************************************************
 * Copyright (C) 2023                                                               *
 * 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.      *
 *                                                                                  *
 * Author:    Shashi Kant Suman                                                       *
 *                                                                                  *
 * ---------------------------------------------------------------------------------*/
#include "main.h"
#include "DSR.h"
#include "List.h"
int fn_NetSim_DSR_Init_F(struct stru_NetSim_Network *NETWORK_Formal,
                         NetSim_EVENTDETAILS *pstruEventDetails_Formal,
                         char *pszAppPath_Formal,
                         char *pszWritePath_Formal,
                         int nVersion_Type,
                         void **fnPointer);
int fn_NetSim_DSR_Configure_F(void** var);
int fn_NetSim_DSR_CopyPacket_F(const NetSim_PACKET* destPacket,const NetSim_PACKET* srcPacket);
int fn_NetSim_DSR_FreePacket_F(NetSim_PACKET* packet);
int fn_NetSim_DSR_Metrics_F(PMETRICSWRITER filename);
 
 
 
/**
DSR Init function initializes the DSR parameters.
*/
_declspec(dllexport) int fn_NetSim_DSR_Init(struct stru_NetSim_Network *NETWORK_Formal,
                                            NetSim_EVENTDETAILS *pstruEventDetails_Formal,
                                            char *pszAppPath_Formal,
                                            char *pszWritePath_Formal,
                                            int nVersion_Type,
                                            void **fnPointer)
{
    return fn_NetSim_DSR_Init_F(NETWORK_Formal,pstruEventDetails_Formal,pszAppPath_Formal,pszWritePath_Formal,nVersion_Type,fnPointer);
}
/**
This is the DSR configure function.
*/
_declspec(dllexport) int fn_NetSim_DSR_Configure(void** var)
{
    return fn_NetSim_DSR_Configure_F(var);
}
/**
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is the DSR Run function which gets called by the IP layer for routing the data
by the DSR Network Routing Protocol. It includes the events NETWORK_OUT_EVENT, 
NETWORK_IN_EVENT and TIMER_EVENT.
 
NETWORK_OUT_EVENT - 
    It process the Data Packets which arrive at the NetworkOut layer to route the packet.
NETWORK_IN_EVENT - 
    It processes Data Packets, Route Request Packets, Route Reply Packets, Route Error 
    Packets, Ack Packet
TIMER_EVENT -
    It Process the DSR Route Request timeout and the DSR Maintenance Buffer timeout.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
*/
_declspec(dllexport) int fn_NetSim_DSR_Run()
{
    set_dsr_curr();
    if (!isDsrConfigured(pstruEventDetails->nDeviceId, dsr_get_curr_if()))
        return -1;
    switch(pstruEventDetails->nEventType)
    {
    case NETWORK_OUT_EVENT:
        switch(pstruEventDetails->nSubEventType)
        {
        case 0: //Packet from upper layer or Network in
        default:
            {
                if(!isDSRPACKET(pstruEventDetails->pPacket))
                {
                    NETSIM_IPAddress n1,n2;
                    NETSIM_IPAddress dest = pstruEventDetails->pPacket->pstruNetworkData->szDestIP;
                    NETSIM_IPAddress ip = dsr_get_curr_ip();
                    if(ip->type != dest->type)
                        return 0;
                    n1=IP_NETWORK_ADDRESS(ip,
                        DEVICE_INTERFACE(pstruEventDetails->nDeviceId,1)->szSubnetMask,
                        DEVICE_INTERFACE(pstruEventDetails->nDeviceId,1)->prefix_len);
                    n2=IP_NETWORK_ADDRESS(dest,
                        DEVICE_INTERFACE(pstruEventDetails->nDeviceId,1)->szSubnetMask,
                        DEVICE_INTERFACE(pstruEventDetails->nDeviceId,1)->prefix_len);
 
                    if(!IP_COMPARE(n1,n2))
                        DSR_PACKET_PROCESSING();
                    else
                        return 0; //Other network packet
                }
                else
                {
                    //DSR control packet
                    //No processing just forward
                }
            }
            break;
        }
        if(pstruEventDetails->pPacket)
            pstruEventDetails->nInterfaceId = dsr_get_curr_if();
        else
            pstruEventDetails->nInterfaceId = 0;
        break;
    case NETWORK_IN_EVENT:
        {
            switch(pstruEventDetails->nSubEventType)
            {
            case 0:
            default:
                {
                    switch(pstruEventDetails->pPacket->nControlDataType)
                    {
                    default://Data packet or other layer control packet
                        if(pstruEventDetails->pPacket->pstruNetworkData->Packet_RoutingProtocol)
                        {
                            DSR_PROCESS_SRC_ROUTE();
                            if(pstruEventDetails->pPacket && pstruEventDetails->pPacket->pstruNetworkData)
                                pstruEventDetails->pPacket->pstruNetworkData->nTTL--;
                            //pstruEventDetails->pPacket=NULL;
                        }
                        break;
                    case ctrlPacket_ROUTE_REQUEST:
                        DSR_PROCESS_RREQ();
                        pstruEventDetails->pPacket=NULL;
                        break;
                    case ctrlPacket_ROUTE_REPLY:
                        DSR_PROCESS_RREP();
                        pstruEventDetails->pPacket=NULL;
                        break;
                    case ctrlPacket_ROUTE_ERROR:
                        DSR_PROCESS_RERR();
                        pstruEventDetails->pPacket=NULL;
 
                        break;
                    case ctrlPacket_ACK:
                        DSR_PROCESS_ACK();
                        pstruEventDetails->pPacket=NULL;
 
                    }
                }
                break;
            case subevent_PROCESS_RERR:
                DSR_PROCESS_RERR();
                pstruEventDetails->pPacket=NULL;
            break;
            }
        }
        break;
    case TIMER_EVENT:
        {
            switch(pstruEventDetails->nSubEventType)
            {
                case subevent_RREQ_TIMEOUT:
                    DSR_RREQ_TIMEOUT();
                    
                break;
                case subevent_MAINT_TIMEOUT:
                    DSR_MAINT_TIMEOUT();
                break;
            }
        }
        break;
    }
    
    return 1;
}
/**
    This function is called by NetworkStack.dll, while writing the evnt trace 
    to get the sub event as a string.
*/
_declspec(dllexport) char* fn_NetSim_DSR_Trace(NETSIM_ID nSubeventid)
{
    switch(nSubeventid)
    {
    case subevent_RREQ_TIMEOUT:
        return "DSR_RREQ_TIMEOUT";
    case subevent_MAINT_TIMEOUT:
        return "DSR_MAINT_TIMEOUT";
    case subevent_PROCESS_RERR:
        return "DSR_PROCESS_RERR";
    default:
        return "DSR_UNKNOWN";
    }
}
/**
    This function is called by NetworkStack.dll, to copy the DSR protocol
    from source packet to destination.
*/
_declspec(dllexport) int fn_NetSim_DSR_CopyPacket(const NetSim_PACKET* destPacket,const NetSim_PACKET* srcPacket)
{
    return fn_NetSim_DSR_CopyPacket_F(destPacket,srcPacket);
}
/**
    This function is called by NetworkStack.dll, to free the TCP protocol.
*/
_declspec(dllexport) int fn_NetSim_DSR_FreePacket(NetSim_PACKET* packet)
{
    return fn_NetSim_DSR_FreePacket_F(packet);
}
/**
This function call WLAN Metrics function in lib file to write the Metrics in Metrics.txt.   
*/
_declspec(dllexport) int fn_NetSim_DSR_Metrics(PMETRICSWRITER filename)
{
    return fn_NetSim_DSR_Metrics_F(filename);
}
/**
    This function is called by NetworkStack.dll, once simulation end to free the 
    allocated memory for the network.   
*/
_declspec(dllexport) int fn_NetSim_DSR_Finish()
{
    return fn_NetSim_DSR_Finish_F();
}
/**
This function will return the string to write packet trace heading.
*/
_declspec(dllexport) char* fn_NetSim_DSR_ConfigPacketTrace()
{
    return "";
}
/**
 This function will return the string to write packet trace.                                                                                                    
*/
_declspec(dllexport) char* fn_NetSim_DSR_WritePacketTrace()
{
    return "";
}