ULONG AllocatePortFromRange	(	PPORT_SET	PortSet,
		ULONG	Lowest,
		ULONG	Highest
	)

Definition at line 86 of file ports.c.

Referenced by TCPAllocatePort(), and UDPAllocatePort().

                                                                              {
    ULONG AllocatedPort;
    KIRQL OldIrql;

    if ((Lowest < PortSet->StartingPort) ||
        (Highest >= PortSet->StartingPort + PortSet->PortsToOversee))
    {
        return -1;
    }

    Lowest -= PortSet->StartingPort;
    Highest -= PortSet->StartingPort;

    KeAcquireSpinLock( &PortSet->Lock, &OldIrql );
    AllocatedPort = RtlFindClearBits( &PortSet->ProtoBitmap, 1, Lowest );
    if( AllocatedPort != (ULONG)-1 && AllocatedPort <= Highest) {
    RtlSetBit( &PortSet->ProtoBitmap, AllocatedPort );
    AllocatedPort += PortSet->StartingPort;
    KeReleaseSpinLock( &PortSet->Lock, OldIrql );
    return htons(AllocatedPort);
    }
    KeReleaseSpinLock( &PortSet->Lock, OldIrql );

    return -1;
}

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