reactos/lib/drivers/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     PCHAR PacketBuffer;
  32     UINT PacketLength;
  33     PNDIS_PACKET XmitPacket;
  34     NDIS_STATUS NdisStatus;
  35     IP_PACKET IPPacket;
  36     PNDIS_BUFFER NdisBuffer;
  37
  38     ASSERT_KM_POINTER(NdisPacket);
  39     ASSERT_KM_POINTER(PC(NdisPacket));
  40     ASSERT_KM_POINTER(PC(NdisPacket)->DLComplete);
  41
  42     TI_DbgPrint(MAX_TRACE, ("Called (NdisPacket = %x)\n", NdisPacket));
  43
  44     GetDataPtr( NdisPacket, 0, &PacketBuffer, &PacketLength );
  45
  46     NdisStatus = AllocatePacketWithBuffer
  47         ( &XmitPacket, PacketBuffer, PacketLength );
  48
  49     (PC(NdisPacket)->DLComplete)
  50         ( PC(NdisPacket)->Context, NdisPacket, NdisStatus );
  51
  52     if( NT_SUCCESS(NdisStatus) ) {
  53         IPInitializePacket(&IPPacket, 0);
  54
  55         IPPacket.NdisPacket = XmitPacket;
  56
  57         NdisGetFirstBufferFromPacket(XmitPacket,
  58                                      &NdisBuffer,
  59                                      &IPPacket.Header,
  60                                      &IPPacket.ContigSize,
  61                                      &IPPacket.TotalSize);
  62
  63         IPReceive(Loopback, &IPPacket);
  64
  65         FreeNdisPacket(XmitPacket);
  66     }
  67
  68     TI_DbgPrint(MAX_TRACE, ("Done\n"));
  69 }
  70
  71 NDIS_STATUS LoopRegisterAdapter(
  72   PNDIS_STRING AdapterName,
  73   PLAN_ADAPTER *Adapter)
  74 /*
  75  * FUNCTION: Registers loopback adapter with the network layer
  76  * ARGUMENTS:
  77  *   AdapterName = Unused
  78  *   Adapter     = Unused
  79  * RETURNS:
  80  *   Status of operation
  81  */
  82 {
  83   LLIP_BIND_INFO BindInfo;
  84
  85   TI_DbgPrint(MID_TRACE, ("Called.\n"));
  86
  87   /* Bind the adapter to network (IP) layer */
  88   BindInfo.Context = NULL;
  89   BindInfo.HeaderSize = 0;
  90   BindInfo.MinFrameSize = 0;
  91   BindInfo.MTU = 16384;
  92   BindInfo.Address = NULL;
  93   BindInfo.AddressLength = 0;
  94   BindInfo.Transmit = LoopTransmit;
  95
  96   Loopback = IPCreateInterface(&BindInfo);
  97   if (!Loopback) return NDIS_STATUS_RESOURCES;
  98
  99   Loopback->Name.Buffer = L"Loopback";
 100   Loopback->Name.MaximumLength = Loopback->Name.Length =
 101       wcslen(Loopback->Name.Buffer) * sizeof(WCHAR);
 102
 103   AddrInitIPv4(&Loopback->Unicast, LOOPBACK_ADDRESS_IPv4);
 104   AddrInitIPv4(&Loopback->Netmask, LOOPBACK_ADDRMASK_IPv4);
 105   AddrInitIPv4(&Loopback->Broadcast, LOOPBACK_BCASTADDR_IPv4);
 106
 107   IPRegisterInterface(Loopback);
 108   IPAddInterfaceRoute(Loopback);
 109
 110   TI_DbgPrint(MAX_TRACE, ("Leaving.\n"));
 111
 112   return NDIS_STATUS_SUCCESS;
 113 }
 114
 115
 116 NDIS_STATUS LoopUnregisterAdapter(
 117   PLAN_ADAPTER Adapter)
 118 /*
 119  * FUNCTION: Unregisters loopback adapter with the network layer
 120  * ARGUMENTS:
 121  *   Adapter = Unused
 122  * RETURNS:
 123  *   Status of operation
 124  * NOTES:
 125  *   Does not care wether we have registered loopback adapter
 126  */
 127 {
 128   TI_DbgPrint(MID_TRACE, ("Called.\n"));
 129
 130   if (Loopback != NULL)
 131     {
 132       IPUnregisterInterface(Loopback);
 133       IPDestroyInterface(Loopback);
 134       Loopback = NULL;
 135     }
 136
 137   TI_DbgPrint(MAX_TRACE, ("Leaving.\n"));
 138
 139   return NDIS_STATUS_SUCCESS;
 140 }