Demos/Host/LowLevel/RNDISEthernetHost/Lib/RNDISCommands.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  RNDIS Device commands, to issue RNDIS commands to the device for
  34  *  the control and data transfer between the host and RNDIS device.
  35  */
  36
  37 #include "RNDISCommands.h"
  38
  39 /** Current RNDIS Request ID, for associating sent commands with received data */
  40 uint32_t RequestID = 0;
  41
  42
  43 /** Function to send the given encapsulated RNDIS command to the device.
  44  *
  45  *  \param[in] Buffer  Source command data buffer to send to the device
  46  *  \param[in] Length   Number of bytes to send
  47  *
  48  *  \return A value from the USB_Host_SendControlErrorCodes_t enum
  49  */
  50 uint8_t RNDIS_SendEncapsulatedCommand(void* const Buffer,
  51                                       const uint16_t Length)
  52 {
  53         USB_ControlRequest = (USB_Request_Header_t)
  54                 {
  55                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
  56                         .bRequest      = RNDIS_REQ_SendEncapsulatedCommand,
  57                         .wValue        = 0,
  58                         .wIndex        = 0,
  59                         .wLength       = Length,
  60                 };
  61
  62         /* Select the control pipe for the request transfer */
  63         Pipe_SelectPipe(PIPE_CONTROLPIPE);
  64
  65         return USB_Host_SendControlRequest(Buffer);
  66 }
  67
  68 /** Function to receive the given encapsulated RNDIS response from the device.
  69  *
  70  *  \param[out] Buffer  Destination command data buffer to write read data from the device to
  71  *  \param[in] Length   Number of bytes to read
  72  *
  73  *  \return A value from the USB_Host_SendControlErrorCodes_t enum
  74  */
  75 uint8_t RNDIS_GetEncapsulatedResponse(void* const Buffer,
  76                                       const uint16_t Length)
  77 {
  78         USB_ControlRequest = (USB_Request_Header_t)
  79                 {
  80                         .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
  81                         .bRequest      = RNDIS_REQ_GetEncapsulatedResponse,
  82                         .wValue        = 0,
  83                         .wIndex        = 0,
  84                         .wLength       = Length,
  85                 };
  86
  87         /* Select the control pipe for the request transfer */
  88         Pipe_SelectPipe(PIPE_CONTROLPIPE);
  89
  90         return USB_Host_SendControlRequest(Buffer);
  91 }
  92
  93 /** Sends a RNDIS KEEPALIVE command to the device, to ensure that it does not enter standby mode after periods
  94  *  of long inactivity.
  95  *
  96  *  \return A value from the USB_Host_SendControlErrorCodes_t enum or RNDIS_COMMAND_FAILED if the device returned a
  97  *          logical command failure
  98  */
  99 uint8_t RNDIS_SendKeepAlive(void)
 100 {
 101         uint8_t ErrorCode;
 102
 103         RNDIS_KeepAlive_Message_t  KeepAliveMessage;
 104         RNDIS_KeepAlive_Complete_t KeepAliveMessageResponse;
 105
 106         KeepAliveMessage.MessageType     = REMOTE_NDIS_KEEPALIVE_MSG;
 107         KeepAliveMessage.MessageLength   = sizeof(RNDIS_KeepAlive_Message_t);
 108         KeepAliveMessage.RequestId       = RequestID++;
 109
 110         if ((ErrorCode = RNDIS_SendEncapsulatedCommand(&KeepAliveMessage,
 111                                                        sizeof(RNDIS_KeepAlive_Message_t))) != HOST_SENDCONTROL_Successful)
 112         {
 113                 return ErrorCode;
 114         }
 115
 116         if ((ErrorCode = RNDIS_GetEncapsulatedResponse(&KeepAliveMessageResponse,
 117                                                        sizeof(RNDIS_KeepAlive_Complete_t))) != HOST_SENDCONTROL_Successful)
 118         {
 119                 return ErrorCode;
 120         }
 121
 122         return HOST_SENDCONTROL_Successful;
 123 }
 124
 125 /** Initializes the attached RNDIS device's RNDIS interface.
 126  *
 127  *  \param[in] HostMaxPacketSize  Size of the packet buffer on the host
 128  *  \param[out] DeviceMaxPacketSize   Pointer to where the packet buffer size of the device is to be stored
 129  *
 130  *  \return A value from the USB_Host_SendControlErrorCodes_t enum or RNDIS_COMMAND_FAILED if the device returned a
 131  *          logical command failure
 132  */
 133 uint8_t RNDIS_InitializeDevice(const uint16_t HostMaxPacketSize,
 134                                uint16_t* const DeviceMaxPacketSize)
 135 {
 136         uint8_t ErrorCode;
 137
 138         RNDIS_Initialize_Message_t  InitMessage;
 139         RNDIS_Initialize_Complete_t InitMessageResponse;
 140
 141         InitMessage.MessageType     = REMOTE_NDIS_INITIALIZE_MSG;
 142         InitMessage.MessageLength   = sizeof(RNDIS_Initialize_Message_t);
 143         InitMessage.RequestId       = RequestID++;
 144
 145         InitMessage.MajorVersion    = REMOTE_NDIS_VERSION_MAJOR;
 146         InitMessage.MinorVersion    = REMOTE_NDIS_VERSION_MINOR;
 147         InitMessage.MaxTransferSize = HostMaxPacketSize;
 148
 149         if ((ErrorCode = RNDIS_SendEncapsulatedCommand(&InitMessage,
 150                                                        sizeof(RNDIS_Initialize_Message_t))) != HOST_SENDCONTROL_Successful)
 151         {
 152                 return ErrorCode;
 153         }
 154
 155         if ((ErrorCode = RNDIS_GetEncapsulatedResponse(&InitMessageResponse,
 156                                                        sizeof(RNDIS_Initialize_Complete_t))) != HOST_SENDCONTROL_Successful)
 157         {
 158                 return ErrorCode;
 159         }
 160
 161         if (InitMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
 162           return RNDIS_COMMAND_FAILED;
 163
 164         *DeviceMaxPacketSize = InitMessageResponse.MaxTransferSize;
 165
 166         return HOST_SENDCONTROL_Successful;
 167 }
 168
 169 /** Sets a given RNDIS property of an attached RNDIS device.
 170  *
 171  *  \param[in] Oid  OID number of the parameter to set
 172  *  \param[in] Buffer  Pointer to where the property data is to be sourced from
 173  *  \param[in] Length  Length in bytes of the property data to sent to the device
 174  *
 175  *  \return A value from the USB_Host_SendControlErrorCodes_t enum or RNDIS_COMMAND_FAILED if the device returned a
 176  *          logical command failure
 177  */
 178 uint8_t RNDIS_SetRNDISProperty(const uint32_t Oid,
 179                                void* Buffer,
 180                                const uint16_t Length)
 181 {
 182         uint8_t ErrorCode;
 183
 184         struct
 185         {
 186                 RNDIS_Set_Message_t SetMessage;
 187                 uint8_t             ContiguousBuffer[Length];
 188         } SetMessageData;
 189
 190         RNDIS_Set_Complete_t SetMessageResponse;
 191
 192         SetMessageData.SetMessage.MessageType    = REMOTE_NDIS_SET_MSG;
 193         SetMessageData.SetMessage.MessageLength  = sizeof(RNDIS_Set_Message_t) + Length;
 194         SetMessageData.SetMessage.RequestId      = RequestID++;
 195
 196         SetMessageData.SetMessage.Oid            = Oid;
 197         SetMessageData.SetMessage.InformationBufferLength = Length;
 198         SetMessageData.SetMessage.InformationBufferOffset = (sizeof(RNDIS_Set_Message_t) - sizeof(RNDIS_Message_Header_t));
 199         SetMessageData.SetMessage.DeviceVcHandle = 0;
 200
 201         memcpy(&SetMessageData.ContiguousBuffer, Buffer, Length);
 202
 203         if ((ErrorCode = RNDIS_SendEncapsulatedCommand(&SetMessageData,
 204                                                        SetMessageData.SetMessage.MessageLength)) != HOST_SENDCONTROL_Successful)
 205         {
 206                 return ErrorCode;
 207         }
 208
 209         if ((ErrorCode = RNDIS_GetEncapsulatedResponse(&SetMessageResponse,
 210                                                        sizeof(RNDIS_Set_Complete_t))) != HOST_SENDCONTROL_Successful)
 211         {
 212                 return ErrorCode;
 213         }
 214
 215         if (SetMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
 216           return RNDIS_COMMAND_FAILED;
 217
 218         return HOST_SENDCONTROL_Successful;
 219 }
 220
 221 /** Gets a given RNDIS property of an attached RNDIS device.
 222  *
 223  *  \param[in] Oid  OID number of the parameter to get
 224  *  \param[in] Buffer  Pointer to where the property data is to be written to
 225  *  \param[in] MaxLength  Length in bytes of the destination buffer size
 226  *
 227  *  \return A value from the USB_Host_SendControlErrorCodes_t enum or RNDIS_COMMAND_FAILED if the device returned a
 228  *          logical command failure
 229  */
 230 uint8_t RNDIS_QueryRNDISProperty(const uint32_t Oid,
 231                                  void* Buffer,
 232                                  const uint16_t MaxLength)
 233 {
 234         uint8_t ErrorCode;
 235
 236         RNDIS_Query_Message_t QueryMessage;
 237
 238         struct
 239         {
 240                 RNDIS_Query_Complete_t QueryMessageResponse;
 241                 uint8_t                ContiguousBuffer[MaxLength];
 242         } QueryMessageResponseData;
 243
 244         QueryMessage.MessageType    = REMOTE_NDIS_QUERY_MSG;
 245         QueryMessage.MessageLength  = sizeof(RNDIS_Query_Message_t);
 246         QueryMessage.RequestId      = RequestID++;
 247
 248         QueryMessage.Oid            = Oid;
 249         QueryMessage.InformationBufferLength = 0;
 250         QueryMessage.InformationBufferOffset = 0;
 251         QueryMessage.DeviceVcHandle = 0;
 252
 253         if ((ErrorCode = RNDIS_SendEncapsulatedCommand(&QueryMessage,
 254                                                        sizeof(RNDIS_Query_Message_t))) != HOST_SENDCONTROL_Successful)
 255         {
 256                 return ErrorCode;
 257         }
 258
 259         if ((ErrorCode = RNDIS_GetEncapsulatedResponse(&QueryMessageResponseData,
 260                                                        sizeof(QueryMessageResponseData))) != HOST_SENDCONTROL_Successful)
 261         {
 262                 return ErrorCode;
 263         }
 264
 265         if (QueryMessageResponseData.QueryMessageResponse.Status != REMOTE_NDIS_STATUS_SUCCESS)
 266           return RNDIS_COMMAND_FAILED;
 267
 268         memcpy(Buffer, &QueryMessageResponseData.ContiguousBuffer, MaxLength);
 269
 270         return HOST_SENDCONTROL_Successful;
 271 }
 272
 273 /** Retrieves the size of a received packet, discarding the remainder of the RNDIS packet header to leave only the
 274  *  packet contents for processing by the host.
 275  *
 276  *  \param[out] PacketLength  Size of the packet currently in the pipe
 277  *
 278  *  \return A value from the Pipe_Stream_RW_ErrorCodes_t enum
 279  */
 280 uint8_t RNDIS_GetPacketLength(uint16_t* const PacketLength)
 281 {
 282         uint8_t ErrorCode;
 283
 284         Pipe_SelectPipe(RNDIS_DATA_IN_PIPE);
 285         Pipe_SetPipeToken(PIPE_TOKEN_IN);
 286         Pipe_Unfreeze();
 287
 288         if (!(Pipe_IsReadWriteAllowed()))
 289         {
 290                 *PacketLength = 0;
 291                 Pipe_Freeze();
 292                 return PIPE_RWSTREAM_NoError;
 293         }
 294
 295         RNDIS_Packet_Message_t DeviceMessage;
 296
 297         if ((ErrorCode = Pipe_Read_Stream_LE(&DeviceMessage, sizeof(RNDIS_Packet_Message_t), NULL)) != PIPE_RWSTREAM_NoError)
 298         {
 299                 return ErrorCode;
 300         }
 301
 302         *PacketLength = (uint16_t)DeviceMessage.DataLength;
 303
 304         Pipe_Discard_Stream(DeviceMessage.DataOffset - (sizeof(RNDIS_Packet_Message_t) - sizeof(RNDIS_Message_Header_t)),
 305                             NULL);
 306
 307         Pipe_Freeze();
 308
 309         return PIPE_RWSTREAM_NoError;
 310 }
 311