GeneralPacketProcessing.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 "AODV.h"
#include "List.h"
_declspec(dllexport) int fn_NetSim_AODV_PacketDropNotification(NetSim_PACKET* packet);
/**
This function is called in the Network Out Event for routing of the packet.
 
If the Device route table has a route to the target, then the packet is added to sent to the
next hop ip
 
Whenever a packet is to be routed to a destination and the device route cache doesnt have
a route to the target, the Packet is added to the FIFO and a Route Discovery is 
iitiated if not already.
 
*/
int fn_NetSim_AODV_GeneralPacketProcessing(NetSim_EVENTDETAILS* pstruEventDetails)
{
    NETSIM_IPAddress destIP = pstruEventDetails->pPacket->pstruNetworkData->szDestIP;
    pstruEventDetails->pPacket->pstruNetworkData->szGatewayIP = IP_COPY(aodv_get_curr_ip());
    if(AODV_CHECK_ROUTE_FOUND(destIP))
    {
        NETSIM_ID port;
        //Route found
        NETSIM_IPAddress nextHop = IP_COPY(AODV_FIND_NEXT_HOP(AODV_DEV_VAR(pstruEventDetails->nDeviceId),destIP));
        pstruEventDetails->pPacket->nTransmitterId = pstruEventDetails->nDeviceId;
        pstruEventDetails->pPacket->nReceiverId = fn_NetSim_Stack_GetDeviceId_asIP(nextHop,&port);
        pstruEventDetails->pPacket->pstruNetworkData->szNextHopIp = nextHop;
        pstruEventDetails->pPacket->pstruNetworkData->nTTL = AODV_NET_DIAMETER;
        pstruEventDetails->pPacket->DropNotification = fn_NetSim_AODV_PacketDropNotification;
        sprintf(comment, "Sending Data Packet using an existing route");
        ///Update the life time
        AODV_UPDATE_ROUTE_TABLE(destIP,
            pstruEventDetails->dEventTime+AODV_ACTIVE_ROUTE_TIMEOUT);
        ///Update the metrics
        if(pstruEventDetails->nDeviceId == pstruEventDetails->pPacket->nSourceId)
            AODV_METRICS_VAR(pstruEventDetails->nDeviceId).packetOrginated++;
        AODV_METRICS_VAR(pstruEventDetails->nDeviceId).packetTransmitted++;
    }
    else if(AODV_ADD_TO_FIFO(pstruEventDetails->pPacket,&AODV_DEV_VAR(pstruEventDetails->nDeviceId)->fifo,pstruEventDetails->dEventTime))
    {
        ///No route found but RREQ is already sent
        pstruEventDetails->pPacket = NULL;
    }
    else
    {
        ///No route found. generate RREQ
        pstruEventDetails->pPacket = AODV_GEN_RREQ();
    }
    return 1;
}