diff options
Diffstat (limited to 'lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/RNDIS.c')
| -rw-r--r-- | lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/RNDIS.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/RNDIS.c b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/RNDIS.c new file mode 100644 index 000000000..00052ed39 --- /dev/null +++ b/lib/lufa/Demos/Device/LowLevel/RNDISEthernet/Lib/RNDIS.c @@ -0,0 +1,394 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * + * RNDIS command handler functions. This handles RNDIS commands according to + * the Microsoft RNDIS specification, creating a USB Ethernet network adapter. + */ + +#define INCLUDE_FROM_RNDIS_C +#include "RNDIS.h" + +/** Physical MAC address of the network adapter, which becomes the MAC address of the host for packets sent to the adapter. */ +static const MAC_Address_t PROGMEM AdapterMACAddress = {ADAPTER_MAC_ADDRESS}; + +/** Vendor description of the adapter. This is overridden by the INF file required to install the appropriate RNDIS drivers for + * the device, but may still be used by the OS in some circumstances. + */ +static const char PROGMEM AdapterVendorDescription[] = "LUFA RNDIS Adapter"; + +/** List of RNDIS OID commands supported by this adapter. */ +static const uint32_t PROGMEM AdapterSupportedOIDList[] = + { + OID_GEN_SUPPORTED_LIST, + OID_GEN_PHYSICAL_MEDIUM, + OID_GEN_HARDWARE_STATUS, + OID_GEN_MEDIA_SUPPORTED, + OID_GEN_MEDIA_IN_USE, + OID_GEN_MAXIMUM_FRAME_SIZE, + OID_GEN_MAXIMUM_TOTAL_SIZE, + OID_GEN_LINK_SPEED, + OID_GEN_TRANSMIT_BLOCK_SIZE, + OID_GEN_RECEIVE_BLOCK_SIZE, + OID_GEN_VENDOR_ID, + OID_GEN_VENDOR_DESCRIPTION, + OID_GEN_CURRENT_PACKET_FILTER, + OID_GEN_MAXIMUM_TOTAL_SIZE, + OID_GEN_MEDIA_CONNECT_STATUS, + OID_GEN_XMIT_OK, + OID_GEN_RCV_OK, + OID_GEN_XMIT_ERROR, + OID_GEN_RCV_ERROR, + OID_GEN_RCV_NO_BUFFER, + OID_802_3_PERMANENT_ADDRESS, + OID_802_3_CURRENT_ADDRESS, + OID_802_3_MULTICAST_LIST, + OID_802_3_MAXIMUM_LIST_SIZE, + OID_802_3_RCV_ERROR_ALIGNMENT, + OID_802_3_XMIT_ONE_COLLISION, + OID_802_3_XMIT_MORE_COLLISIONS, + }; + +/** Buffer for RNDIS messages (as distinct from Ethernet frames sent through the adapter. This must be big enough to hold the entire + * Supported OID list, plus the response header. The buffer is half-duplex, and is written to as it is read to save on SRAM - for this + * reason, care must be taken when constructing RNDIS responses that unread data is not overwritten when writing in responses. + */ +uint8_t RNDISMessageBuffer[sizeof(AdapterSupportedOIDList) + sizeof(RNDIS_Query_Complete_t)]; + +/** Pointer to the RNDIS message header at the top of the RNDIS message buffer, for convenience. */ +RNDIS_Message_Header_t* MessageHeader = (RNDIS_Message_Header_t*)&RNDISMessageBuffer; + +/** Indicates if a RNDIS message response is ready to be sent back to the host. */ +bool ResponseReady = false; + +/** Current RNDIS adapter state, a value from the \c RNDIS_States_t enum. */ +uint8_t CurrRNDISState = RNDIS_Uninitialized; + +/** Current Ethernet packet filter mask. This is non-zero when the adapter is initialized, or zero when disabled. */ +uint32_t CurrPacketFilter = 0; + + +/** Processes the RNDIS message received by the host and stored in the RNDISMessageBuffer global buffer. If a response is + * created, the ResponseReady global is updated so that the response is written back to the host upon request. + */ +void ProcessRNDISControlMessage(void) +{ + /* Note: Only a single buffer is used for both the received message and its response to save SRAM. Because of + this, response bytes should be filled in order so that they do not clobber unread data in the buffer. */ + + switch (MessageHeader->MessageType) + { + case REMOTE_NDIS_INITIALIZE_MSG: + /* Initialize the adapter - return information about the supported RNDIS version and buffer sizes */ + + ResponseReady = true; + + RNDIS_Initialize_Message_t* INITIALIZE_Message = (RNDIS_Initialize_Message_t*)&RNDISMessageBuffer; + RNDIS_Initialize_Complete_t* INITIALIZE_Response = (RNDIS_Initialize_Complete_t*)&RNDISMessageBuffer; + + INITIALIZE_Response->MessageType = REMOTE_NDIS_INITIALIZE_CMPLT; + INITIALIZE_Response->MessageLength = sizeof(RNDIS_Initialize_Complete_t); + INITIALIZE_Response->RequestId = INITIALIZE_Message->RequestId; + INITIALIZE_Response->Status = REMOTE_NDIS_STATUS_SUCCESS; + + INITIALIZE_Response->MajorVersion = REMOTE_NDIS_VERSION_MAJOR; + INITIALIZE_Response->MinorVersion = REMOTE_NDIS_VERSION_MINOR; + INITIALIZE_Response->DeviceFlags = REMOTE_NDIS_DF_CONNECTIONLESS; + INITIALIZE_Response->Medium = REMOTE_NDIS_MEDIUM_802_3; + INITIALIZE_Response->MaxPacketsPerTransfer = 1; + INITIALIZE_Response->MaxTransferSize = (sizeof(RNDIS_Packet_Message_t) + ETHERNET_FRAME_SIZE_MAX); + INITIALIZE_Response->PacketAlignmentFactor = 0; + INITIALIZE_Response->AFListOffset = 0; + INITIALIZE_Response->AFListSize = 0; + + CurrRNDISState = RNDIS_Initialized; + + break; + case REMOTE_NDIS_HALT_MSG: + /* Halt the adapter, reset the adapter state - note that no response should be returned when completed */ + + ResponseReady = false; + MessageHeader->MessageLength = 0; + + CurrRNDISState = RNDIS_Uninitialized; + + break; + case REMOTE_NDIS_QUERY_MSG: + /* Request for information about a parameter about the adapter, specified as an OID token */ + + ResponseReady = true; + + RNDIS_Query_Message_t* QUERY_Message = (RNDIS_Query_Message_t*)&RNDISMessageBuffer; + RNDIS_Query_Complete_t* QUERY_Response = (RNDIS_Query_Complete_t*)&RNDISMessageBuffer; + uint32_t Query_Oid = QUERY_Message->Oid; + + void* QueryData = &RNDISMessageBuffer[sizeof(RNDIS_Message_Header_t) + + QUERY_Message->InformationBufferOffset]; + void* ResponseData = &RNDISMessageBuffer[sizeof(RNDIS_Query_Complete_t)]; + uint16_t ResponseSize; + + QUERY_Response->MessageType = REMOTE_NDIS_QUERY_CMPLT; + QUERY_Response->MessageLength = sizeof(RNDIS_Query_Complete_t); + + if (ProcessNDISQuery(Query_Oid, QueryData, QUERY_Message->InformationBufferLength, + ResponseData, &ResponseSize)) + { + QUERY_Response->Status = REMOTE_NDIS_STATUS_SUCCESS; + QUERY_Response->MessageLength += ResponseSize; + + QUERY_Response->InformationBufferLength = ResponseSize; + QUERY_Response->InformationBufferOffset = (sizeof(RNDIS_Query_Complete_t) - sizeof(RNDIS_Message_Header_t)); + } + else + { + QUERY_Response->Status = REMOTE_NDIS_STATUS_NOT_SUPPORTED; + + QUERY_Response->InformationBufferLength = 0; + QUERY_Response->InformationBufferOffset = 0; + } + + break; + case REMOTE_NDIS_SET_MSG: + /* Request to set a parameter of the adapter, specified as an OID token */ + + ResponseReady = true; + + RNDIS_Set_Message_t* SET_Message = (RNDIS_Set_Message_t*)&RNDISMessageBuffer; + RNDIS_Set_Complete_t* SET_Response = (RNDIS_Set_Complete_t*)&RNDISMessageBuffer; + uint32_t SET_Oid = SET_Message->Oid; + + SET_Response->MessageType = REMOTE_NDIS_SET_CMPLT; + SET_Response->MessageLength = sizeof(RNDIS_Set_Complete_t); + SET_Response->RequestId = SET_Message->RequestId; + + void* SetData = &RNDISMessageBuffer[sizeof(RNDIS_Message_Header_t) + + SET_Message->InformationBufferOffset]; + + if (ProcessNDISSet(SET_Oid, SetData, SET_Message->InformationBufferLength)) + SET_Response->Status = REMOTE_NDIS_STATUS_SUCCESS; + else + SET_Response->Status = REMOTE_NDIS_STATUS_NOT_SUPPORTED; + + break; + case REMOTE_NDIS_RESET_MSG: + /* Soft reset the adapter */ + + ResponseReady = true; + + RNDIS_Reset_Complete_t* RESET_Response = (RNDIS_Reset_Complete_t*)&RNDISMessageBuffer; + + RESET_Response->MessageType = REMOTE_NDIS_RESET_CMPLT; + RESET_Response->MessageLength = sizeof(RNDIS_Reset_Complete_t); + RESET_Response->Status = REMOTE_NDIS_STATUS_SUCCESS; + RESET_Response->AddressingReset = 0; + + break; + case REMOTE_NDIS_KEEPALIVE_MSG: + /* Keep alive message sent to the adapter every 5 seconds when idle to ensure it is still responding */ + + ResponseReady = true; + + RNDIS_KeepAlive_Message_t* KEEPALIVE_Message = (RNDIS_KeepAlive_Message_t*)&RNDISMessageBuffer; + RNDIS_KeepAlive_Complete_t* KEEPALIVE_Response = (RNDIS_KeepAlive_Complete_t*)&RNDISMessageBuffer; + + KEEPALIVE_Response->MessageType = REMOTE_NDIS_KEEPALIVE_CMPLT; + KEEPALIVE_Response->MessageLength = sizeof(RNDIS_KeepAlive_Complete_t); + KEEPALIVE_Response->RequestId = KEEPALIVE_Message->RequestId; + KEEPALIVE_Response->Status = REMOTE_NDIS_STATUS_SUCCESS; + + break; + } +} + +/** Processes RNDIS query commands, retrieving information from the adapter and reporting it back to the host. The requested + * parameter is given as an OID value. + * + * \param[in] OId OId value of the parameter being queried + * \param[in] QueryData Pointer to any extra query data being sent by the host to the device inside the RNDIS message buffer + * \param[in] QuerySize Size in bytes of the extra query data being sent by the host + * \param[out] ResponseData Pointer to the start of the query response inside the RNDIS message buffer + * \param[out] ResponseSize Pointer to the size in bytes of the response data being sent to the host + * + * \return Boolean \c true if the query was handled, \c false otherwise + */ +static bool ProcessNDISQuery(const uint32_t OId, void* QueryData, uint16_t QuerySize, + void* ResponseData, uint16_t* ResponseSize) +{ + /* Handler for REMOTE_NDIS_QUERY_MSG messages */ + + switch (OId) + { + case OID_GEN_SUPPORTED_LIST: + *ResponseSize = sizeof(AdapterSupportedOIDList); + + /* Copy the list of supported NDIS OID tokens to the response buffer */ + memcpy_P(ResponseData, AdapterSupportedOIDList, sizeof(AdapterSupportedOIDList)); + + return true; + case OID_GEN_PHYSICAL_MEDIUM: + *ResponseSize = sizeof(uint32_t); + + /* Indicate that the device is a true ethernet link */ + *((uint32_t*)ResponseData) = 0; + + return true; + case OID_GEN_HARDWARE_STATUS: + *ResponseSize = sizeof(uint32_t); + + /* Always indicate hardware ready */ + *((uint32_t*)ResponseData) = NDIS_HardwareStatus_Ready; + + return true; + case OID_GEN_MEDIA_SUPPORTED: + case OID_GEN_MEDIA_IN_USE: + *ResponseSize = sizeof(uint32_t); + + /* Indicate 802.3 (Ethernet) supported by the adapter */ + *((uint32_t*)ResponseData) = REMOTE_NDIS_MEDIUM_802_3; + + return true; + case OID_GEN_VENDOR_ID: + *ResponseSize = sizeof(uint32_t); + + /* Vendor ID 0x0xFFFFFF is reserved for vendors who have not purchased a NDIS VID */ + *((uint32_t*)ResponseData) = 0x00FFFFFF; + + return true; + case OID_GEN_MAXIMUM_FRAME_SIZE: + case OID_GEN_TRANSMIT_BLOCK_SIZE: + case OID_GEN_RECEIVE_BLOCK_SIZE: + *ResponseSize = sizeof(uint32_t); + + /* Indicate that the maximum frame size is the size of the ethernet frame buffer */ + *((uint32_t*)ResponseData) = ETHERNET_FRAME_SIZE_MAX; + + return true; + case OID_GEN_VENDOR_DESCRIPTION: + *ResponseSize = sizeof(AdapterVendorDescription); + + /* Copy vendor description string to the response buffer */ + memcpy_P(ResponseData, AdapterVendorDescription, sizeof(AdapterVendorDescription)); + + return true; + case OID_GEN_MEDIA_CONNECT_STATUS: + *ResponseSize = sizeof(uint32_t); + + /* Always indicate that the adapter is connected to a network */ + *((uint32_t*)ResponseData) = REMOTE_NDIS_MEDIA_STATE_CONNECTED; + + return true; + case OID_GEN_LINK_SPEED: + *ResponseSize = sizeof(uint32_t); + + /* Indicate 10Mb/s link speed */ + *((uint32_t*)ResponseData) = 100000; + + return true; + case OID_802_3_PERMANENT_ADDRESS: + case OID_802_3_CURRENT_ADDRESS: + *ResponseSize = sizeof(MAC_Address_t); + + /* Copy over the fixed adapter MAC to the response buffer */ + memcpy_P(ResponseData, &AdapterMACAddress, sizeof(MAC_Address_t)); + + return true; + case OID_802_3_MAXIMUM_LIST_SIZE: + *ResponseSize = sizeof(uint32_t); + + /* Indicate only one multicast address supported */ + *((uint32_t*)ResponseData) = 1; + + return true; + case OID_GEN_CURRENT_PACKET_FILTER: + *ResponseSize = sizeof(uint32_t); + + /* Indicate the current packet filter mask */ + *((uint32_t*)ResponseData) = CurrPacketFilter; + + return true; + case OID_GEN_XMIT_OK: + case OID_GEN_RCV_OK: + case OID_GEN_XMIT_ERROR: + case OID_GEN_RCV_ERROR: + case OID_GEN_RCV_NO_BUFFER: + case OID_802_3_RCV_ERROR_ALIGNMENT: + case OID_802_3_XMIT_ONE_COLLISION: + case OID_802_3_XMIT_MORE_COLLISIONS: + *ResponseSize = sizeof(uint32_t); + + /* Unused statistic OIDs - always return 0 for each */ + *((uint32_t*)ResponseData) = 0; + + return true; + case OID_GEN_MAXIMUM_TOTAL_SIZE: + *ResponseSize = sizeof(uint32_t); + + /* Indicate maximum overall buffer (Ethernet frame and RNDIS header) the adapter can handle */ + *((uint32_t*)ResponseData) = (sizeof(RNDISMessageBuffer) + ETHERNET_FRAME_SIZE_MAX); + + return true; + default: + return false; + } +} + +/** Processes RNDIS set commands, setting adapter parameters to values given by the host. The requested parameter is given + * as an OID value. + * + * \param[in] OId OId value of the parameter being set + * \param[in] SetData Pointer to the parameter value in the RNDIS message buffer + * \param[in] SetSize Size in bytes of the parameter value being sent by the host + * + * \return Boolean \c true if the set was handled, \c false otherwise + */ +static bool ProcessNDISSet(uint32_t OId, void* SetData, uint16_t SetSize) +{ + /* Handler for REMOTE_NDIS_SET_MSG messages */ + + switch (OId) + { + case OID_GEN_CURRENT_PACKET_FILTER: + /* Save the packet filter mask in case the host queries it again later */ + CurrPacketFilter = *((uint32_t*)SetData); + + /* Set the RNDIS state to initialized if the packet filter is non-zero */ + CurrRNDISState = ((CurrPacketFilter) ? RNDIS_Data_Initialized : RNDIS_Initialized); + + return true; + case OID_802_3_MULTICAST_LIST: + /* Do nothing - throw away the value from the host as it is unused */ + + return true; + default: + return false; + } +} + |