reactos/drivers/lib/ip/network/loopback.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS TCP/IP protocol driver
   4  * FILE:        datalink/loopback.c
   5  * PURPOSE:     Loopback adapter
   6  * PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
   7  * REVISIONS:
   8  *   CSH 01/08-2000 Created
   9  */
  10
  11 #include "precomp.h"
  12
  13 PIP_INTERFACE Loopback = NULL;
  14
  15 VOID LoopTransmit(
  16   PVOID Context,
  17   PNDIS_PACKET NdisPacket,
  18   UINT Offset,
  19   PVOID LinkAddress,
  20   USHORT Type)
  21 /*
  22  * FUNCTION: Transmits a packet
  23  * ARGUMENTS:
  24  *   Context     = Pointer to context information (NULL)
  25  *   NdisPacket  = Pointer to NDIS packet to send
  26  *   Offset      = Offset in packet where packet data starts
  27  *   LinkAddress = Pointer to link address
  28  *   Type        = LAN protocol type (unused)
  29  */
  30 {
  31   IP_PACKET IPPacket;
  32
  33   TI_DbgPrint(MAX_TRACE, ("Called (NdisPacket = %x)\n", NdisPacket));
  34
  35   IPPacket.NdisPacket = NdisPacket;
  36   IPPacket.HeaderSize = 0;
  37   GetDataPtr( NdisPacket, 0, (PCHAR *)&IPPacket.Header, &IPPacket.TotalSize );
  38
  39   TI_DbgPrint(MAX_TRACE,
  40               ("Doing receive (complete: %x, context %x, packet %x)\n",
  41                PC(NdisPacket)->DLComplete, Context, NdisPacket));
  42   IPReceive(Context, &IPPacket);
  43   TI_DbgPrint(MAX_TRACE,
  44               ("Finished receive (complete: %x, context %x, packet %x)\n",
  45                PC(NdisPacket)->DLComplete, Context, NdisPacket));
  46   PC(NdisPacket)->DLComplete(Context, NdisPacket, NDIS_STATUS_SUCCESS);
  47   TI_DbgPrint(MAX_TRACE, ("Done\n"));
  48 }
  49
  50 NDIS_STATUS LoopRegisterAdapter(
  51   PNDIS_STRING AdapterName,
  52   PLAN_ADAPTER *Adapter)
  53 /*
  54  * FUNCTION: Registers loopback adapter with the network layer
  55  * ARGUMENTS:
  56  *   AdapterName = Unused
  57  *   Adapter     = Unused
  58  * RETURNS:
  59  *   Status of operation
  60  */
  61 {
  62   PIP_ADDRESS Address;
  63   NDIS_STATUS Status;
  64
  65   Status = NDIS_STATUS_SUCCESS;
  66
  67   TI_DbgPrint(MID_TRACE, ("Called.\n"));
  68
  69   Address = AddrBuildIPv4(LOOPBACK_ADDRESS_IPv4);
  70   if (Address != NULL)
  71     {
  72       LLIP_BIND_INFO BindInfo;
  73
  74       /* Bind the adapter to network (IP) layer */
  75       BindInfo.Context = NULL;
  76       BindInfo.HeaderSize = 0;
  77       BindInfo.MinFrameSize = 0;
  78       BindInfo.MTU = 16384;
  79       BindInfo.Address = NULL;
  80       BindInfo.AddressLength = 0;
  81       BindInfo.Transmit = LoopTransmit;
  82
  83       Loopback = IPCreateInterface(&BindInfo);
  84
  85       if ((Loopback != NULL) && (IPCreateNTE(Loopback, Address, 8)))
  86         {
  87           IPRegisterInterface(Loopback);
  88         }
  89       else
  90         {
  91           Status = NDIS_STATUS_RESOURCES;
  92         }
  93     }
  94   else
  95     {
  96       Status = NDIS_STATUS_RESOURCES;
  97     }
  98
  99   if (!NT_SUCCESS(Status))
 100     {
 101       LoopUnregisterAdapter(NULL);
 102     }
 103
 104   TI_DbgPrint(MAX_TRACE, ("Leaving.\n"));
 105
 106   return Status;
 107 }
 108
 109
 110 NDIS_STATUS LoopUnregisterAdapter(
 111   PLAN_ADAPTER Adapter)
 112 /*
 113  * FUNCTION: Unregisters loopback adapter with the network layer
 114  * ARGUMENTS:
 115  *   Adapter = Unused
 116  * RETURNS:
 117  *   Status of operation
 118  * NOTES:
 119  *   Does not care wether we have registered loopback adapter
 120  */
 121 {
 122   TI_DbgPrint(MID_TRACE, ("Called.\n"));
 123
 124   if (Loopback != NULL)
 125     {
 126       IPUnregisterInterface(Loopback);
 127       IPDestroyInterface(Loopback);
 128       Loopback = NULL;
 129     }
 130
 131   TI_DbgPrint(MAX_TRACE, ("Leaving.\n"));
 132
 133   return NDIS_STATUS_SUCCESS;
 134 }