AODV.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:    Shashi Kant Suman                                                       *
*                                                                                  *
* ---------------------------------------------------------------------------------*/
#include "main.h"
#include "AODV.h"
#include "List.h"
 
int fn_NetSim_AODV_Init_F();
char* fn_NetSim_AODV_Trace_F(NETSIM_ID);
int fn_NetSim_AODV_FreePacket_F();
int fn_NetSim_AODV_CopyPacket_F();
int fn_NetSim_AODV_Metrics_F(PMETRICSWRITER metricsWriter);
int fn_NetSim_AODV_Configure_F();
char* fn_NetSim_AODV_ConfigPacketTrace_F();
int fn_NetSim_AODV_Finish_F();
char* fn_NetSim_AODV_WritePacketTrace_F();
 
 
 
 
 
/**
AODV Init function initializes the AODV parameters.
*/
_declspec(dllexport) int fn_NetSim_AODV_Init()
{
    return fn_NetSim_AODV_Init_F();
}
/**
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is the AODV 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 AODV Route Request timeout and the AODV Maintenance Buffer timeout.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
_declspec(dllexport) int fn_NetSim_AODV_Run()
{
    set_aodv_curr();
    NETSIM_ID in = aodv_get_curr_if();
    if (!isAodvConfigured(pstruEventDetails->nDeviceId, in))
        return -1;
 
    switch(pstruEventDetails->nEventType)
    {
    case NETWORK_OUT_EVENT:
        {
            if(pstruEventDetails->pPacket->nPacketType != PacketType_Control ||
                pstruEventDetails->pPacket->nControlDataType/100 != NW_PROTOCOL_AODV)
            {
                NETSIM_IPAddress n1,n2;
                NETSIM_IPAddress dest = pstruEventDetails->pPacket->pstruNetworkData->szDestIP;
                NETSIM_IPAddress ip = aodv_get_curr_ip();
                if(ip->type != dest->type)
                    return 0;
                n1=IP_NETWORK_ADDRESS(ip,
                    DEVICE_INTERFACE(pstruEventDetails->nDeviceId,in)->szSubnetMask,
                    DEVICE_INTERFACE(pstruEventDetails->nDeviceId,in)->prefix_len);
                n2=IP_NETWORK_ADDRESS(dest,
                    DEVICE_INTERFACE(pstruEventDetails->nDeviceId,in)->szSubnetMask,
                    DEVICE_INTERFACE(pstruEventDetails->nDeviceId,in)->prefix_len);
 
                if(!IP_COMPARE(n1,n2))
                    AODV_PACKET_PROCESSING();
                else
                    return 0; //Other network packet
            }
            else
            {
                //No processing required
                pstruEventDetails->pPacket->pstruNetworkData->szNextHopIp=aodv_get_dev_ip(pstruEventDetails->pPacket->nReceiverId);
            }
            if (pstruEventDetails->pPacket)
            {
                if (pstruEventDetails->pPacket->pstruNetworkData->nTTL > 1)
                {
                    pstruEventDetails->nInterfaceId = in;
                    if (!pstruEventDetails->pPacket->nReceiverId)
                        AODV_DEV_VAR(pstruEventDetails->nDeviceId)->dLastBroadcastTime = pstruEventDetails->dEventTime;
                }
                else
                {
                    fn_NetSim_Packet_FreePacket(pstruEventDetails->pPacket);
                    pstruEventDetails->pPacket = NULL;
                    pstruEventDetails->nInterfaceId = 0;
                }
            }
            else
                pstruEventDetails->nInterfaceId = 0;
        }
        break;
    case NETWORK_IN_EVENT:
        switch(pstruEventDetails->pPacket->nControlDataType)
        {
        case AODVctrlPacket_RREQ:
            AODV_PROCESS_RREQ();
            pstruEventDetails->pPacket=NULL;
            break;
        case AODVctrlPacket_RREP:
            AODV_PROCESS_RREP();
            pstruEventDetails->pPacket=NULL;
            break;
        case AODVctrlPacket_RERR:
            AODV_PROCESS_RERR();
            pstruEventDetails->pPacket=NULL;
            break;
        default:
        {
            NetSim_PACKET* packet = pstruEventDetails->pPacket;
            if (isDestFoundinPacket(packet, pstruEventDetails->nDeviceId))
            {
                //Update the life time
                AODV_UPDATE_ROUTE_TABLE(packet->pstruNetworkData->szSourceIP,
                                        pstruEventDetails->dEventTime + AODV_ACTIVE_ROUTE_TIMEOUT);
            }
            else
            {
                packet->pstruNetworkData->szNextHopIp = NULL;
                packet->DropNotification = NULL;
                //Update the life time of dest
                AODV_UPDATE_ROUTE_TABLE(packet->pstruNetworkData->szDestIP,
                                        pstruEventDetails->dEventTime + AODV_ACTIVE_ROUTE_TIMEOUT);
                //Update the life time of source
                AODV_UPDATE_ROUTE_TABLE(packet->pstruNetworkData->szSourceIP,
                                        pstruEventDetails->dEventTime + AODV_ACTIVE_ROUTE_TIMEOUT);
            }
        }
        break;
        }
        break;
    case TIMER_EVENT:
        switch(pstruEventDetails->nSubEventType)
        {
        case AODVsubevent_RREQ_TIMEOUT:
            AODV_RETRY_RREQ();
            break;
        case AODVsubevent_TRANSMIT_HELLO:
            AODV_TRANSMIT_HELLO();
            break;
        case AODVsubevent_ACTIVE_ROUTE_TIMEOUT:
            AODV_ACTIVE_ROUTE_TIMEOUT_EVENT();
            break;
        default:
            fnNetSimError("Unknown subevent for AODV");
            break;
        }
        break;
    default:
        fnNetSimError("Unknown event type for AODV");
        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_AODV_Trace(NETSIM_ID id)
{
    return fn_NetSim_AODV_Trace_F(id);
}
/**
This function is called by NetworkStack.dll, to free the AODV protocol parameters.
*/
_declspec(dllexport) int fn_NetSim_AODV_FreePacket(NetSim_PACKET* packet)
{
    return fn_NetSim_AODV_FreePacket_F(packet);
}
/**
This function is called by NetworkStack.dll, to copy the AODV protocol parameters
from source packet to destination.
*/
_declspec(dllexport) int fn_NetSim_AODV_CopyPacket(const NetSim_PACKET* destPacket,const NetSim_PACKET* srcPacket)
{
    return fn_NetSim_AODV_CopyPacket_F(destPacket,srcPacket);
}
/**
This function call WLAN Metrics function in lib file to write the Metrics in Metrics.txt    
*/
_declspec(dllexport) int fn_NetSim_AODV_Metrics(PMETRICSWRITER metricsWriter)
{
    return fn_NetSim_AODV_Metrics_F(metricsWriter);
}
/**
This function is called by NetworkStack.dll, while configuring the device 
NETWORK layer for AODV protocol.    
*/
_declspec(dllexport) int fn_NetSim_AODV_Configure(void** var)
{
    return fn_NetSim_AODV_Configure_F(var);
}
/**
This function will return the string to write packet trace heading.
*/
_declspec(dllexport) char* fn_NetSim_AODV_ConfigPacketTrace()
{
    return fn_NetSim_AODV_ConfigPacketTrace_F();
}
/**
This function is called by NetworkStack.dll, once simulation end to free the 
allocated memory for the network.   
*/
_declspec(dllexport) int fn_NetSim_AODV_Finish()
{
    return fn_NetSim_AODV_Finish_F();
}
/**
This function will return the string to write packet trace.                                                                                                 
*/
_declspec(dllexport) char* fn_NetSim_AODV_WritePacketTrace()
{
    return fn_NetSim_AODV_WritePacketTrace_F();
}