Routing.c

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/************************************************************************************
* Copyright (C) 2020                                                               *
* 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:    Thangarasu                                                       *
*                                                                                  *
* ---------------------------------------------------------------------------------*/
#include "main.h"
#include "Routing.h"
/** This function is used to call the inter and intra area routing protocols */
_declspec(dllexport) int fn_NetSim_Routing_Run()
{
    switch(pstruEventDetails->nProtocolId)
    {
    case APP_PROTOCOL_RIP:
        fn_NetSim_RIP_Run_F();
        break;
    default:
        break;
    }
    return 1;
}
/** This function is used to update the entries in routing table */
_declspec(dllexport)int fn_NetSim_UpdateEntryinRoutingTable(struct stru_NetSim_Network *NETWORK,NetSim_EVENTDETAILS *pstruEventDetails,NETSIM_ID nDeviceId,NETSIM_ID nInterfaceId,unsigned int bgpRemoteAS,NETSIM_IPAddress szDestinationIP,NETSIM_IPAddress szNexthop,NETSIM_IPAddress szSubnetmask,unsigned int prefix_len,int nCost,int nFlag)
{
    DEVICE_ROUTER *pstruRouter = get_RIP_var(nDeviceId);
    if(pstruRouter->AppIntRoutingProtocol == APP_PROTOCOL_RIP)
    {
        fn_NetSim_RIP_UpdatingEntriesinRoutingDatabase(NETWORK,nDeviceId,szDestinationIP,szSubnetmask,szNexthop,nInterfaceId,pstruEventDetails->dEventTime,nCost);  
        if(nFlag)
        {
            fn_NetSim_RIP_TriggeredUpdate(NETWORK,pstruEventDetails);
        }
    }
    
    return 0;
}
/** This function is used to update the protocol status in the interface */
_declspec(dllexport)int UpdateInterfaceList()
{
    NETSIM_ID i,j;
    DEVICE_ROUTER *pstruRouter;
    NETSIM_ID nDeviceCount,nInterfaceCount,nConnectedDevId,nConnectedInterId;
    nDeviceCount = NETWORK->nDeviceCount;
    for(i=0;i<nDeviceCount;i++)
    {
        //if(NETWORK->ppstruDeviceList[i]->nDeviceType == ROUTER)
        if(fnCheckRoutingProtocol(i+1))
        {
            nInterfaceCount = NETWORK->ppstruDeviceList[i]->nNumOfInterface;
            if(NETWORK->ppstruDeviceList[i]->pstruApplicationLayer)
            {
                pstruRouter = get_RIP_var(i + 1);
                if(!pstruRouter->RoutingProtocol)
                {
                    pstruRouter->RoutingProtocol = calloc(nInterfaceCount,sizeof* pstruRouter->RoutingProtocol);
                }
                for(j=0;j<nInterfaceCount;j++)
                {
                    if(NETWORK->ppstruDeviceList[i]->ppstruInterfaceList[j]->nInterfaceType == INTERFACE_WAN_ROUTER)
                    {
                        fn_NetSim_Stack_GetConnectedDevice(i+1,j+1,&nConnectedDevId,&nConnectedInterId);
                        pstruRouter->RoutingProtocol[j] = APP_PROTOCOL_RIP;
                    }
                }
            }
        }
    }
    return 0;
}
int fnCheckRoutingPacket()
{
    if(pstruEventDetails->pPacket && pstruEventDetails->pPacket->nControlDataType/100 == APP_PROTOCOL_RIP)
        return 1;
    return 0;
}
 
APPLICATION_LAYER_PROTOCOL fnCheckRoutingProtocol(NETSIM_ID deviceId)
{
    if(fn_NetSim_Stack_isProtocolConfigured(deviceId,APPLICATION_LAYER,APP_PROTOCOL_RIP))
        return APP_PROTOCOL_RIP;
    else
        return APP_PROTOCOL_NULL;
}