qemu/hw/usb-net.c

/*
 * QEMU USB Net devices
 *
 * Copyright (c) 2006 Thomas Sailer
 * Copyright (c) 2008 Andrzej Zaborowski
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu-common.h"
#include "usb.h"
#include "net.h"
#include "sys-queue.h"

/*#define TRAFFIC_DEBUG*/
/* Thanks to NetChip Technologies for donating this product ID.
 * It's for devices with only CDC Ethernet configurations.
 */
#define CDC_VENDOR_NUM          0x0525  /* NetChip */
#define CDC_PRODUCT_NUM         0xa4a1  /* Linux-USB Ethernet Gadget */
/* For hardware that can talk RNDIS and either of the above protocols,
 * use this ID ... the windows INF files will know it.
 */
#define RNDIS_VENDOR_NUM        0x0525  /* NetChip */
#define RNDIS_PRODUCT_NUM       0xa4a2  /* Ethernet/RNDIS Gadget */

enum usbstring_idx {
    STRING_MANUFACTURER		= 1,
    STRING_PRODUCT,
    STRING_ETHADDR,
    STRING_DATA,
    STRING_CONTROL,
    STRING_RNDIS_CONTROL,
    STRING_CDC,
    STRING_SUBSET,
    STRING_RNDIS,
    STRING_SERIALNUMBER,
};

#define DEV_CONFIG_VALUE		1	/* CDC or a subset */
#define DEV_RNDIS_CONFIG_VALUE		2	/* RNDIS; optional */

#define USB_CDC_SUBCLASS_ACM		0x02
#define USB_CDC_SUBCLASS_ETHERNET	0x06

#define USB_CDC_PROTO_NONE		0
#define USB_CDC_ACM_PROTO_VENDOR	0xff

#define USB_CDC_HEADER_TYPE		0x00	/* header_desc */
#define USB_CDC_CALL_MANAGEMENT_TYPE	0x01	/* call_mgmt_descriptor */
#define USB_CDC_ACM_TYPE		0x02	/* acm_descriptor */
#define USB_CDC_UNION_TYPE		0x06	/* union_desc */
#define USB_CDC_ETHERNET_TYPE		0x0f	/* ether_desc */

#define USB_DT_CS_INTERFACE		0x24
#define USB_DT_CS_ENDPOINT		0x25

#define ClassInterfaceRequest		\
    ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
#define ClassInterfaceOutRequest	\
    ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)

#define USB_CDC_SEND_ENCAPSULATED_COMMAND	0x00
#define USB_CDC_GET_ENCAPSULATED_RESPONSE	0x01
#define USB_CDC_REQ_SET_LINE_CODING		0x20
#define USB_CDC_REQ_GET_LINE_CODING		0x21
#define USB_CDC_REQ_SET_CONTROL_LINE_STATE	0x22
#define USB_CDC_REQ_SEND_BREAK			0x23
#define USB_CDC_SET_ETHERNET_MULTICAST_FILTERS	0x40
#define USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER	0x41
#define USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER	0x42
#define USB_CDC_SET_ETHERNET_PACKET_FILTER	0x43
#define USB_CDC_GET_ETHERNET_STATISTIC		0x44

#define LOG2_STATUS_INTERVAL_MSEC	5    /* 1 << 5 == 32 msec */
#define STATUS_BYTECOUNT		16   /* 8 byte header + data */

#define ETH_FRAME_LEN			1514 /* Max. octets in frame sans FCS */

/*
 * mostly the same descriptor as the linux gadget rndis driver
 */
static const uint8_t qemu_net_dev_descriptor[] = {
    0x12,			/*  u8 bLength; */
    USB_DT_DEVICE,		/*  u8 bDescriptorType; Device */
    0x00, 0x02,			/*  u16 bcdUSB; v2.0 */
    USB_CLASS_COMM,		/*  u8  bDeviceClass; */
    0x00,			/*  u8  bDeviceSubClass; */
    0x00,			/*  u8  bDeviceProtocol; [ low/full only ] */
    0x40,			/*  u8  bMaxPacketSize0 */
    RNDIS_VENDOR_NUM & 0xff, RNDIS_VENDOR_NUM >> 8,	/*  u16 idVendor; */
    RNDIS_PRODUCT_NUM & 0xff, RNDIS_PRODUCT_NUM >> 8,	/*  u16 idProduct; */
    0x00, 0x00,			/*  u16 bcdDevice */
    STRING_MANUFACTURER,	/*  u8  iManufacturer; */
    STRING_PRODUCT,		/*  u8  iProduct; */
    STRING_SERIALNUMBER,	/*  u8  iSerialNumber; */
    0x02,			/*  u8  bNumConfigurations; */
};

static const uint8_t qemu_net_rndis_config_descriptor[] = {
    /* Configuration Descriptor */
    0x09,			/*  u8  bLength */
    USB_DT_CONFIG,		/*  u8  bDescriptorType */
    0x43, 0x00,			/*  le16 wTotalLength */
    0x02,			/*  u8  bNumInterfaces */
    DEV_RNDIS_CONFIG_VALUE,	/*  u8  bConfigurationValue */
    STRING_RNDIS,		/*  u8  iConfiguration */
    0xc0,			/*  u8  bmAttributes */
    0x32,			/*  u8  bMaxPower */
    /* RNDIS Control Interface */
    0x09,			/*  u8  bLength */
    USB_DT_INTERFACE,		/*  u8  bDescriptorType */
    0x00,			/*  u8  bInterfaceNumber */
    0x00,			/*  u8  bAlternateSetting */
    0x01,			/*  u8  bNumEndpoints */
    USB_CLASS_COMM,		/*  u8  bInterfaceClass */
    USB_CDC_SUBCLASS_ACM,	/*  u8  bInterfaceSubClass */
    USB_CDC_ACM_PROTO_VENDOR,	/*  u8  bInterfaceProtocol */
    STRING_RNDIS_CONTROL,	/*  u8  iInterface */
    /* Header Descriptor */
    0x05,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_HEADER_TYPE,	/*  u8    bDescriptorSubType */
    0x10, 0x01,			/*  le16  bcdCDC */
    /* Call Management Descriptor */
    0x05,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_CALL_MANAGEMENT_TYPE,	/*  u8    bDescriptorSubType */
    0x00,			/*  u8    bmCapabilities */
    0x01,			/*  u8    bDataInterface */
    /* ACM Descriptor */
    0x04,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_ACM_TYPE,		/*  u8    bDescriptorSubType */
    0x00,			/*  u8    bmCapabilities */
    /* Union Descriptor */
    0x05,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_UNION_TYPE,		/*  u8    bDescriptorSubType */
    0x00,			/*  u8    bMasterInterface0 */
    0x01,			/*  u8    bSlaveInterface0 */
    /* Status Descriptor */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_IN | 1,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_INT,	/*  u8  bmAttributes */
    STATUS_BYTECOUNT & 0xff, STATUS_BYTECOUNT >> 8, /*  le16 wMaxPacketSize */
    1 << LOG2_STATUS_INTERVAL_MSEC,	/*  u8  bInterval */
    /* RNDIS Data Interface */
    0x09,			/*  u8  bLength */
    USB_DT_INTERFACE,		/*  u8  bDescriptorType */
    0x01,			/*  u8  bInterfaceNumber */
    0x00,			/*  u8  bAlternateSetting */
    0x02,			/*  u8  bNumEndpoints */
    USB_CLASS_CDC_DATA,		/*  u8  bInterfaceClass */
    0x00,			/*  u8  bInterfaceSubClass */
    0x00,			/*  u8  bInterfaceProtocol */
    STRING_DATA,		/*  u8  iInterface */
    /* Source Endpoint */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_IN | 2,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_BULK,	/*  u8  bmAttributes */
    0x40, 0x00,			/*  le16 wMaxPacketSize */
    0x00,			/*  u8  bInterval */
    /* Sink Endpoint */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_OUT | 2,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_BULK,	/*  u8  bmAttributes */
    0x40, 0x00,			/*  le16 wMaxPacketSize */
    0x00			/*  u8  bInterval */
};

static const uint8_t qemu_net_cdc_config_descriptor[] = {
    /* Configuration Descriptor */
    0x09,			/*  u8  bLength */
    USB_DT_CONFIG,		/*  u8  bDescriptorType */
    0x50, 0x00,			/*  le16 wTotalLength */
    0x02,			/*  u8  bNumInterfaces */
    DEV_CONFIG_VALUE,		/*  u8  bConfigurationValue */
    STRING_CDC,			/*  u8  iConfiguration */
    0xc0,			/*  u8  bmAttributes */
    0x32,			/*  u8  bMaxPower */
    /* CDC Control Interface */
    0x09,			/*  u8  bLength */
    USB_DT_INTERFACE,		/*  u8  bDescriptorType */
    0x00,			/*  u8  bInterfaceNumber */
    0x00,			/*  u8  bAlternateSetting */
    0x01,			/*  u8  bNumEndpoints */
    USB_CLASS_COMM,		/*  u8  bInterfaceClass */
    USB_CDC_SUBCLASS_ETHERNET,	/*  u8  bInterfaceSubClass */
    USB_CDC_PROTO_NONE,		/*  u8  bInterfaceProtocol */
    STRING_CONTROL,		/*  u8  iInterface */
    /* Header Descriptor */
    0x05,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_HEADER_TYPE,	/*  u8    bDescriptorSubType */
    0x10, 0x01,			/*  le16  bcdCDC */
    /* Union Descriptor */
    0x05,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_UNION_TYPE,		/*  u8    bDescriptorSubType */
    0x00,			/*  u8    bMasterInterface0 */
    0x01,			/*  u8    bSlaveInterface0 */
    /* Ethernet Descriptor */
    0x0d,			/*  u8    bLength */
    USB_DT_CS_INTERFACE,	/*  u8    bDescriptorType */
    USB_CDC_ETHERNET_TYPE,	/*  u8    bDescriptorSubType */
    STRING_ETHADDR,		/*  u8    iMACAddress */
    0x00, 0x00, 0x00, 0x00,	/*  le32  bmEthernetStatistics */
    ETH_FRAME_LEN & 0xff, ETH_FRAME_LEN >> 8,	/*  le16  wMaxSegmentSize */
    0x00, 0x00,			/*  le16  wNumberMCFilters */
    0x00,			/*  u8    bNumberPowerFilters */
    /* Status Descriptor */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_IN | 1,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_INT,	/*  u8  bmAttributes */
    STATUS_BYTECOUNT & 0xff, STATUS_BYTECOUNT >> 8, /*  le16 wMaxPacketSize */
    1 << LOG2_STATUS_INTERVAL_MSEC,	/*  u8  bInterval */
    /* CDC Data (nop) Interface */
    0x09,			/*  u8  bLength */
    USB_DT_INTERFACE,		/*  u8  bDescriptorType */
    0x01,			/*  u8  bInterfaceNumber */
    0x00,			/*  u8  bAlternateSetting */
    0x00,			/*  u8  bNumEndpoints */
    USB_CLASS_CDC_DATA,		/*  u8  bInterfaceClass */
    0x00,			/*  u8  bInterfaceSubClass */
    0x00,			/*  u8  bInterfaceProtocol */
    0x00,			/*  u8  iInterface */
    /* CDC Data Interface */
    0x09,			/*  u8  bLength */
    USB_DT_INTERFACE,		/*  u8  bDescriptorType */
    0x01,			/*  u8  bInterfaceNumber */
    0x01,			/*  u8  bAlternateSetting */
    0x02,			/*  u8  bNumEndpoints */
    USB_CLASS_CDC_DATA,		/*  u8  bInterfaceClass */
    0x00,			/*  u8  bInterfaceSubClass */
    0x00,			/*  u8  bInterfaceProtocol */
    STRING_DATA,		/*  u8  iInterface */
    /* Source Endpoint */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_IN | 2,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_BULK,	/*  u8  bmAttributes */
    0x40, 0x00,			/*  le16 wMaxPacketSize */
    0x00,			/*  u8  bInterval */
    /* Sink Endpoint */
    0x07,			/*  u8  bLength */
    USB_DT_ENDPOINT,		/*  u8  bDescriptorType */
    USB_DIR_OUT | 2,		/*  u8  bEndpointAddress */
    USB_ENDPOINT_XFER_BULK,	/*  u8  bmAttributes */
    0x40, 0x00,			/*  le16 wMaxPacketSize */
    0x00			/*  u8  bInterval */
};

/*
 * RNDIS Definitions - in theory not specific to USB.
 */
#define RNDIS_MAXIMUM_FRAME_SIZE	1518
#define RNDIS_MAX_TOTAL_SIZE		1558

/* Remote NDIS Versions */
#define RNDIS_MAJOR_VERSION		1
#define RNDIS_MINOR_VERSION		0

/* Status Values */
#define RNDIS_STATUS_SUCCESS		0x00000000U /* Success */
#define RNDIS_STATUS_FAILURE		0xc0000001U /* Unspecified error */
#define RNDIS_STATUS_INVALID_DATA	0xc0010015U /* Invalid data */
#define RNDIS_STATUS_NOT_SUPPORTED	0xc00000bbU /* Unsupported request */
#define RNDIS_STATUS_MEDIA_CONNECT	0x4001000bU /* Device connected */
#define RNDIS_STATUS_MEDIA_DISCONNECT	0x4001000cU /* Device disconnected */

/* Message Set for Connectionless (802.3) Devices */
enum {
    RNDIS_PACKET_MSG		= 1,
    RNDIS_INITIALIZE_MSG	= 2,	/* Initialize device */
    RNDIS_HALT_MSG		= 3,
    RNDIS_QUERY_MSG		= 4,
    RNDIS_SET_MSG		= 5,
    RNDIS_RESET_MSG		= 6,
    RNDIS_INDICATE_STATUS_MSG	= 7,
    RNDIS_KEEPALIVE_MSG		= 8,
};

/* Message completion */
enum {
    RNDIS_INITIALIZE_CMPLT	= 0x80000002U,
    RNDIS_QUERY_CMPLT		= 0x80000004U,
    RNDIS_SET_CMPLT		= 0x80000005U,
    RNDIS_RESET_CMPLT		= 0x80000006U,
    RNDIS_KEEPALIVE_CMPLT	= 0x80000008U,
};

/* Device Flags */
enum {
    RNDIS_DF_CONNECTIONLESS	= 1,
    RNDIS_DF_CONNECTIONORIENTED	= 2,
};

#define RNDIS_MEDIUM_802_3		0x00000000U

/* from drivers/net/sk98lin/h/skgepnmi.h */
#define OID_PNP_CAPABILITIES		0xfd010100
#define OID_PNP_SET_POWER		0xfd010101
#define OID_PNP_QUERY_POWER		0xfd010102
#define OID_PNP_ADD_WAKE_UP_PATTERN	0xfd010103
#define OID_PNP_REMOVE_WAKE_UP_PATTERN	0xfd010104
#define OID_PNP_ENABLE_WAKE_UP		0xfd010106

typedef uint32_t le32;

typedef struct rndis_init_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 MajorVersion;
    le32 MinorVersion;
    le32 MaxTransferSize;
} rndis_init_msg_type;

typedef struct rndis_init_cmplt_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 Status;
    le32 MajorVersion;
    le32 MinorVersion;
    le32 DeviceFlags;
    le32 Medium;
    le32 MaxPacketsPerTransfer;
    le32 MaxTransferSize;
    le32 PacketAlignmentFactor;
    le32 AFListOffset;
    le32 AFListSize;
} rndis_init_cmplt_type;

typedef struct rndis_halt_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
} rndis_halt_msg_type;

typedef struct rndis_query_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 OID;
    le32 InformationBufferLength;
    le32 InformationBufferOffset;
    le32 DeviceVcHandle;
} rndis_query_msg_type;

typedef struct rndis_query_cmplt_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 Status;
    le32 InformationBufferLength;
    le32 InformationBufferOffset;
} rndis_query_cmplt_type;

typedef struct rndis_set_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 OID;
    le32 InformationBufferLength;
    le32 InformationBufferOffset;
    le32 DeviceVcHandle;
} rndis_set_msg_type;

typedef struct rndis_set_cmplt_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 Status;
} rndis_set_cmplt_type;

typedef struct rndis_reset_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 Reserved;
} rndis_reset_msg_type;

typedef struct rndis_reset_cmplt_type {
    le32 MessageType;
    le32 MessageLength;
    le32 Status;
    le32 AddressingReset;
} rndis_reset_cmplt_type;

typedef struct rndis_indicate_status_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 Status;
    le32 StatusBufferLength;
    le32 StatusBufferOffset;
} rndis_indicate_status_msg_type;

typedef struct rndis_keepalive_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
} rndis_keepalive_msg_type;

typedef struct rndis_keepalive_cmplt_type {
    le32 MessageType;
    le32 MessageLength;
    le32 RequestID;
    le32 Status;
} rndis_keepalive_cmplt_type;

struct rndis_packet_msg_type {
    le32 MessageType;
    le32 MessageLength;
    le32 DataOffset;
    le32 DataLength;
    le32 OOBDataOffset;
    le32 OOBDataLength;
    le32 NumOOBDataElements;
    le32 PerPacketInfoOffset;
    le32 PerPacketInfoLength;
    le32 VcHandle;
    le32 Reserved;
};

struct rndis_config_parameter {
    le32 ParameterNameOffset;
    le32 ParameterNameLength;
    le32 ParameterType;
    le32 ParameterValueOffset;
    le32 ParameterValueLength;
};

/* implementation specific */
enum rndis_state
{
    RNDIS_UNINITIALIZED,
    RNDIS_INITIALIZED,
    RNDIS_DATA_INITIALIZED,
};

/* from ndis.h */
enum ndis_oid {
    /* Required Object IDs (OIDs) */
    OID_GEN_SUPPORTED_LIST		= 0x00010101,
    OID_GEN_HARDWARE_STATUS		= 0x00010102,
    OID_GEN_MEDIA_SUPPORTED		= 0x00010103,
    OID_GEN_MEDIA_IN_USE		= 0x00010104,
    OID_GEN_MAXIMUM_LOOKAHEAD		= 0x00010105,
    OID_GEN_MAXIMUM_FRAME_SIZE		= 0x00010106,
    OID_GEN_LINK_SPEED			= 0x00010107,
    OID_GEN_TRANSMIT_BUFFER_SPACE	= 0x00010108,
    OID_GEN_RECEIVE_BUFFER_SPACE	= 0x00010109,
    OID_GEN_TRANSMIT_BLOCK_SIZE		= 0x0001010a,
    OID_GEN_RECEIVE_BLOCK_SIZE		= 0x0001010b,
    OID_GEN_VENDOR_ID			= 0x0001010c,
    OID_GEN_VENDOR_DESCRIPTION		= 0x0001010d,
    OID_GEN_CURRENT_PACKET_FILTER	= 0x0001010e,
    OID_GEN_CURRENT_LOOKAHEAD		= 0x0001010f,
    OID_GEN_DRIVER_VERSION		= 0x00010110,
    OID_GEN_MAXIMUM_TOTAL_SIZE		= 0x00010111,
    OID_GEN_PROTOCOL_OPTIONS		= 0x00010112,
    OID_GEN_MAC_OPTIONS			= 0x00010113,
    OID_GEN_MEDIA_CONNECT_STATUS	= 0x00010114,
    OID_GEN_MAXIMUM_SEND_PACKETS	= 0x00010115,
    OID_GEN_VENDOR_DRIVER_VERSION	= 0x00010116,
    OID_GEN_SUPPORTED_GUIDS		= 0x00010117,
    OID_GEN_NETWORK_LAYER_ADDRESSES	= 0x00010118,
    OID_GEN_TRANSPORT_HEADER_OFFSET	= 0x00010119,
    OID_GEN_MACHINE_NAME		= 0x0001021a,
    OID_GEN_RNDIS_CONFIG_PARAMETER	= 0x0001021b,
    OID_GEN_VLAN_ID			= 0x0001021c,

    /* Optional OIDs */
    OID_GEN_MEDIA_CAPABILITIES		= 0x00010201,
    OID_GEN_PHYSICAL_MEDIUM		= 0x00010202,

    /* Required statistics OIDs */
    OID_GEN_XMIT_OK			= 0x00020101,
    OID_GEN_RCV_OK			= 0x00020102,
    OID_GEN_XMIT_ERROR			= 0x00020103,
    OID_GEN_RCV_ERROR			= 0x00020104,
    OID_GEN_RCV_NO_BUFFER		= 0x00020105,

    /* Optional statistics OIDs */
    OID_GEN_DIRECTED_BYTES_XMIT		= 0x00020201,
    OID_GEN_DIRECTED_FRAMES_XMIT	= 0x00020202,
    OID_GEN_MULTICAST_BYTES_XMIT	= 0x00020203,
    OID_GEN_MULTICAST_FRAMES_XMIT	= 0x00020204,
    OID_GEN_BROADCAST_BYTES_XMIT	= 0x00020205,
    OID_GEN_BROADCAST_FRAMES_XMIT	= 0x00020206,
    OID_GEN_DIRECTED_BYTES_RCV		= 0x00020207,
    OID_GEN_DIRECTED_FRAMES_RCV		= 0x00020208,
    OID_GEN_MULTICAST_BYTES_RCV		= 0x00020209,
    OID_GEN_MULTICAST_FRAMES_RCV	= 0x0002020a,
    OID_GEN_BROADCAST_BYTES_RCV		= 0x0002020b,
    OID_GEN_BROADCAST_FRAMES_RCV	= 0x0002020c,
    OID_GEN_RCV_CRC_ERROR		= 0x0002020d,
    OID_GEN_TRANSMIT_QUEUE_LENGTH	= 0x0002020e,
    OID_GEN_GET_TIME_CAPS		= 0x0002020f,
    OID_GEN_GET_NETCARD_TIME		= 0x00020210,
    OID_GEN_NETCARD_LOAD		= 0x00020211,
    OID_GEN_DEVICE_PROFILE		= 0x00020212,
    OID_GEN_INIT_TIME_MS		= 0x00020213,
    OID_GEN_RESET_COUNTS		= 0x00020214,
    OID_GEN_MEDIA_SENSE_COUNTS		= 0x00020215,
    OID_GEN_FRIENDLY_NAME		= 0x00020216,
    OID_GEN_MINIPORT_INFO		= 0x00020217,
    OID_GEN_RESET_VERIFY_PARAMETERS	= 0x00020218,

    /* IEEE 802.3 (Ethernet) OIDs */
    OID_802_3_PERMANENT_ADDRESS		= 0x01010101,
    OID_802_3_CURRENT_ADDRESS		= 0x01010102,
    OID_802_3_MULTICAST_LIST		= 0x01010103,
    OID_802_3_MAXIMUM_LIST_SIZE		= 0x01010104,
    OID_802_3_MAC_OPTIONS		= 0x01010105,
    OID_802_3_RCV_ERROR_ALIGNMENT	= 0x01020101,
    OID_802_3_XMIT_ONE_COLLISION	= 0x01020102,
    OID_802_3_XMIT_MORE_COLLISIONS	= 0x01020103,
    OID_802_3_XMIT_DEFERRED		= 0x01020201,
    OID_802_3_XMIT_MAX_COLLISIONS	= 0x01020202,
    OID_802_3_RCV_OVERRUN		= 0x01020203,
    OID_802_3_XMIT_UNDERRUN		= 0x01020204,
    OID_802_3_XMIT_HEARTBEAT_FAILURE	= 0x01020205,
    OID_802_3_XMIT_TIMES_CRS_LOST	= 0x01020206,
    OID_802_3_XMIT_LATE_COLLISIONS	= 0x01020207,
};

static const uint32_t oid_supported_list[] =
{
    /* the general stuff */
    OID_GEN_SUPPORTED_LIST,
    OID_GEN_HARDWARE_STATUS,
    OID_GEN_MEDIA_SUPPORTED,
    OID_GEN_MEDIA_IN_USE,
    OID_GEN_MAXIMUM_FRAME_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_VENDOR_DRIVER_VERSION,
    OID_GEN_CURRENT_PACKET_FILTER,
    OID_GEN_MAXIMUM_TOTAL_SIZE,
    OID_GEN_MEDIA_CONNECT_STATUS,
    OID_GEN_PHYSICAL_MEDIUM,

    /* the statistical stuff */
    OID_GEN_XMIT_OK,
    OID_GEN_RCV_OK,
    OID_GEN_XMIT_ERROR,
    OID_GEN_RCV_ERROR,
    OID_GEN_RCV_NO_BUFFER,

    /* IEEE 802.3 */
    /* the general stuff */
    OID_802_3_PERMANENT_ADDRESS,
    OID_802_3_CURRENT_ADDRESS,
    OID_802_3_MULTICAST_LIST,
    OID_802_3_MAC_OPTIONS,
    OID_802_3_MAXIMUM_LIST_SIZE,

    /* the statistical stuff */
    OID_802_3_RCV_ERROR_ALIGNMENT,
    OID_802_3_XMIT_ONE_COLLISION,
    OID_802_3_XMIT_MORE_COLLISIONS,
};

#define NDIS_MAC_OPTION_COPY_LOOKAHEAD_DATA	(1 << 0)
#define NDIS_MAC_OPTION_RECEIVE_SERIALIZED	(1 << 1)
#define NDIS_MAC_OPTION_TRANSFERS_NOT_PEND	(1 << 2)
#define NDIS_MAC_OPTION_NO_LOOPBACK		(1 << 3)
#define NDIS_MAC_OPTION_FULL_DUPLEX		(1 << 4)
#define NDIS_MAC_OPTION_EOTX_INDICATION		(1 << 5)
#define NDIS_MAC_OPTION_8021P_PRIORITY		(1 << 6)

struct rndis_response {
    TAILQ_ENTRY(rndis_response) entries;
    uint32_t length;
    uint8_t buf[0];
};

typedef struct USBNetState {
    USBDevice dev;

    unsigned int rndis;
    enum rndis_state rndis_state;
    uint32_t medium;
    uint32_t speed;
    uint32_t media_state;
    uint16_t filter;
    uint32_t vendorid;
    uint8_t mac[6];

    unsigned int out_ptr;
    uint8_t out_buf[2048];

    USBPacket *inpkt;
    unsigned int in_ptr, in_len;
    uint8_t in_buf[2048];

    char usbstring_mac[13];
    VLANClientState *vc;
    TAILQ_HEAD(rndis_resp_head, rndis_response) rndis_resp;
} USBNetState;

static int ndis_query(USBNetState *s, uint32_t oid,
                      uint8_t *inbuf, unsigned int inlen, uint8_t *outbuf,
                      size_t outlen)
{
    unsigned int i, count;

    switch (oid) {
    /* general oids (table 4-1) */
    /* mandatory */
    case OID_GEN_SUPPORTED_LIST:
        count = sizeof(oid_supported_list) / sizeof(uint32_t);
        for (i = 0; i < count; i++)
            ((le32 *) outbuf)[i] = cpu_to_le32(oid_supported_list[i]);
        return sizeof(oid_supported_list);

    /* mandatory */
    case OID_GEN_HARDWARE_STATUS:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_MEDIA_SUPPORTED:
        *((le32 *) outbuf) = cpu_to_le32(s->medium);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_MEDIA_IN_USE:
        *((le32 *) outbuf) = cpu_to_le32(s->medium);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_MAXIMUM_FRAME_SIZE:
        *((le32 *) outbuf) = cpu_to_le32(ETH_FRAME_LEN);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_LINK_SPEED:
        *((le32 *) outbuf) = cpu_to_le32(s->speed);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_TRANSMIT_BLOCK_SIZE:
        *((le32 *) outbuf) = cpu_to_le32(ETH_FRAME_LEN);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_RECEIVE_BLOCK_SIZE:
        *((le32 *) outbuf) = cpu_to_le32(ETH_FRAME_LEN);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_VENDOR_ID:
        *((le32 *) outbuf) = cpu_to_le32(s->vendorid);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_VENDOR_DESCRIPTION:
        pstrcpy((char *)outbuf, outlen, "QEMU USB RNDIS Net");
        return strlen((char *)outbuf) + 1;

    case OID_GEN_VENDOR_DRIVER_VERSION:
        *((le32 *) outbuf) = cpu_to_le32(1);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_CURRENT_PACKET_FILTER:
        *((le32 *) outbuf) = cpu_to_le32(s->filter);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_MAXIMUM_TOTAL_SIZE:
        *((le32 *) outbuf) = cpu_to_le32(RNDIS_MAX_TOTAL_SIZE);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_MEDIA_CONNECT_STATUS:
        *((le32 *) outbuf) = cpu_to_le32(s->media_state);
        return sizeof(le32);

    case OID_GEN_PHYSICAL_MEDIUM:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    case OID_GEN_MAC_OPTIONS:
        *((le32 *) outbuf) = cpu_to_le32(
                        NDIS_MAC_OPTION_RECEIVE_SERIALIZED |
                        NDIS_MAC_OPTION_FULL_DUPLEX);
        return sizeof(le32);

    /* statistics OIDs (table 4-2) */
    /* mandatory */
    case OID_GEN_XMIT_OK:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_RCV_OK:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_XMIT_ERROR:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_RCV_ERROR:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_GEN_RCV_NO_BUFFER:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* ieee802.3 OIDs (table 4-3) */
    /* mandatory */
    case OID_802_3_PERMANENT_ADDRESS:
        memcpy(outbuf, s->mac, 6);
        return 6;

    /* mandatory */
    case OID_802_3_CURRENT_ADDRESS:
        memcpy(outbuf, s->mac, 6);
        return 6;

    /* mandatory */
    case OID_802_3_MULTICAST_LIST:
        *((le32 *) outbuf) = cpu_to_le32(0xe0000000);
        return sizeof(le32);

    /* mandatory */
    case OID_802_3_MAXIMUM_LIST_SIZE:
        *((le32 *) outbuf) = cpu_to_le32(1);
        return sizeof(le32);

    case OID_802_3_MAC_OPTIONS:
        return 0;

    /* ieee802.3 statistics OIDs (table 4-4) */
    /* mandatory */
    case OID_802_3_RCV_ERROR_ALIGNMENT:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_802_3_XMIT_ONE_COLLISION:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    /* mandatory */
    case OID_802_3_XMIT_MORE_COLLISIONS:
        *((le32 *) outbuf) = cpu_to_le32(0);
        return sizeof(le32);

    default:
        fprintf(stderr, "usbnet: unknown OID 0x%08x\n", oid);
        return 0;
    }
    return -1;
}

static int ndis_set(USBNetState *s, uint32_t oid,
                uint8_t *inbuf, unsigned int inlen)
{
    switch (oid) {
    case OID_GEN_CURRENT_PACKET_FILTER:
        s->filter = le32_to_cpup((le32 *) inbuf);
        if (s->filter) {
            s->rndis_state = RNDIS_DATA_INITIALIZED;
        } else {
            s->rndis_state = RNDIS_INITIALIZED;
        }
        return 0;

    case OID_802_3_MULTICAST_LIST:
        return 0;
    }
    return -1;
}

static int rndis_get_response(USBNetState *s, uint8_t *buf)
{
    int ret = 0;
    struct rndis_response *r = s->rndis_resp.tqh_first;

    if (!r)
        return ret;

    TAILQ_REMOVE(&s->rndis_resp, r, entries);
    ret = r->length;
    memcpy(buf, r->buf, r->length);
    qemu_free(r);

    return ret;
}

static void *rndis_queue_response(USBNetState *s, unsigned int length)
{
    struct rndis_response *r =
            qemu_mallocz(sizeof(struct rndis_response) + length);

    TAILQ_INSERT_TAIL(&s->rndis_resp, r, entries);
    r->length = length;

    return &r->buf[0];
}

static void rndis_clear_responsequeue(USBNetState *s)
{
    struct rndis_response *r;

    while ((r = s->rndis_resp.tqh_first)) {
        TAILQ_REMOVE(&s->rndis_resp, r, entries);
        qemu_free(r);
    }
}

static int rndis_init_response(USBNetState *s, rndis_init_msg_type *buf)
{
    rndis_init_cmplt_type *resp =
            rndis_queue_response(s, sizeof(rndis_init_cmplt_type));

    if (!resp)
        return USB_RET_STALL;

    resp->MessageType = cpu_to_le32(RNDIS_INITIALIZE_CMPLT);
    resp->MessageLength = cpu_to_le32(sizeof(rndis_init_cmplt_type));
    resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
    resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
    resp->MajorVersion = cpu_to_le32(RNDIS_MAJOR_VERSION);
    resp->MinorVersion = cpu_to_le32(RNDIS_MINOR_VERSION);
    resp->DeviceFlags = cpu_to_le32(RNDIS_DF_CONNECTIONLESS);
    resp->Medium = cpu_to_le32(RNDIS_MEDIUM_802_3);
    resp->MaxPacketsPerTransfer = cpu_to_le32(1);
    resp->MaxTransferSize = cpu_to_le32(ETH_FRAME_LEN +
                    sizeof(struct rndis_packet_msg_type) + 22);
    resp->PacketAlignmentFactor = cpu_to_le32(0);
    resp->AFListOffset = cpu_to_le32(0);
    resp->AFListSize = cpu_to_le32(0);
    return 0;
}

static int rndis_query_response(USBNetState *s,
                rndis_query_msg_type *buf, unsigned int length)
{
    rndis_query_cmplt_type *resp;
    /* oid_supported_list is the largest data reply */
    uint8_t infobuf[sizeof(oid_supported_list)];
    uint32_t bufoffs, buflen;
    int infobuflen;
    unsigned int resplen;

    bufoffs = le32_to_cpu(buf->InformationBufferOffset) + 8;
    buflen = le32_to_cpu(buf->InformationBufferLength);
    if (bufoffs + buflen > length)
        return USB_RET_STALL;

    infobuflen = ndis_query(s, le32_to_cpu(buf->OID),
                            bufoffs + (uint8_t *) buf, buflen, infobuf,
                            sizeof(infobuf));
    resplen = sizeof(rndis_query_cmplt_type) +
            ((infobuflen < 0) ? 0 : infobuflen);
    resp = rndis_queue_response(s, resplen);
    if (!resp)
        return USB_RET_STALL;

    resp->MessageType = cpu_to_le32(RNDIS_QUERY_CMPLT);
    resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
    resp->MessageLength = cpu_to_le32(resplen);

    if (infobuflen < 0) {
        /* OID not supported */
        resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
        resp->InformationBufferLength = cpu_to_le32(0);
        resp->InformationBufferOffset = cpu_to_le32(0);
        return 0;
    }

    resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
    resp->InformationBufferOffset =
            cpu_to_le32(infobuflen ? sizeof(rndis_query_cmplt_type) - 8 : 0);
    resp->InformationBufferLength = cpu_to_le32(infobuflen);
    memcpy(resp + 1, infobuf, infobuflen);

    return 0;
}

static int rndis_set_response(USBNetState *s,
                rndis_set_msg_type *buf, unsigned int length)
{
    rndis_set_cmplt_type *resp =
            rndis_queue_response(s, sizeof(rndis_set_cmplt_type));
    uint32_t bufoffs, buflen;
    int ret;

    if (!resp)
        return USB_RET_STALL;

    bufoffs = le32_to_cpu(buf->InformationBufferOffset) + 8;
    buflen = le32_to_cpu(buf->InformationBufferLength);
    if (bufoffs + buflen > length)
        return USB_RET_STALL;

    ret = ndis_set(s, le32_to_cpu(buf->OID),
                    bufoffs + (uint8_t *) buf, buflen);
    resp->MessageType = cpu_to_le32(RNDIS_SET_CMPLT);
    resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
    resp->MessageLength = cpu_to_le32(sizeof(rndis_set_cmplt_type));
    if (ret < 0) {
        /* OID not supported */
        resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
        return 0;
    }
    resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);

    return 0;
}

static int rndis_reset_response(USBNetState *s, rndis_reset_msg_type *buf)
{
    rndis_reset_cmplt_type *resp =
            rndis_queue_response(s, sizeof(rndis_reset_cmplt_type));

    if (!resp)
        return USB_RET_STALL;

    resp->MessageType = cpu_to_le32(RNDIS_RESET_CMPLT);
    resp->MessageLength = cpu_to_le32(sizeof(rndis_reset_cmplt_type));
    resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
    resp->AddressingReset = cpu_to_le32(1); /* reset information */

    return 0;
}

static int rndis_keepalive_response(USBNetState *s,
                rndis_keepalive_msg_type *buf)
{
    rndis_keepalive_cmplt_type *resp =
            rndis_queue_response(s, sizeof(rndis_keepalive_cmplt_type));

    if (!resp)
        return USB_RET_STALL;

    resp->MessageType = cpu_to_le32(RNDIS_KEEPALIVE_CMPLT);
    resp->MessageLength = cpu_to_le32(sizeof(rndis_keepalive_cmplt_type));
    resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
    resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);

    return 0;
}

static int rndis_parse(USBNetState *s, uint8_t *data, int length)
{
    uint32_t msg_type, msg_length;
    le32 *tmp = (le32 *) data;

    msg_type = le32_to_cpup(tmp++);
    msg_length = le32_to_cpup(tmp++);

    switch (msg_type) {
    case RNDIS_INITIALIZE_MSG:
        s->rndis_state = RNDIS_INITIALIZED;
        return rndis_init_response(s, (rndis_init_msg_type *) data);

    case RNDIS_HALT_MSG:
        s->rndis_state = RNDIS_UNINITIALIZED;
        return 0;

    case RNDIS_QUERY_MSG:
        return rndis_query_response(s, (rndis_query_msg_type *) data, length);

    case RNDIS_SET_MSG:
        return rndis_set_response(s, (rndis_set_msg_type *) data, length);

    case RNDIS_RESET_MSG:
        rndis_clear_responsequeue(s);
        s->out_ptr = s->in_ptr = s->in_len = 0;
        return rndis_reset_response(s, (rndis_reset_msg_type *) data);

    case RNDIS_KEEPALIVE_MSG:
        /* For USB: host does this every 5 seconds */
        return rndis_keepalive_response(s, (rndis_keepalive_msg_type *) data);
    }

    return USB_RET_STALL;
}

static void usb_net_handle_reset(USBDevice *dev)
{
}

static const char * const usb_net_stringtable[] = {
    [STRING_MANUFACTURER]	= "QEMU",
    [STRING_PRODUCT]		= "RNDIS/QEMU USB Network Device",
    [STRING_ETHADDR]		= "400102030405",
    [STRING_DATA]		= "QEMU USB Net Data Interface",
    [STRING_CONTROL]		= "QEMU USB Net Control Interface",
    [STRING_RNDIS_CONTROL]	= "QEMU USB Net RNDIS Control Interface",
    [STRING_CDC]		= "QEMU USB Net CDC",
    [STRING_SUBSET]		= "QEMU USB Net Subset",
    [STRING_RNDIS]		= "QEMU USB Net RNDIS",
    [STRING_SERIALNUMBER]	= "1",
};

static int usb_net_handle_control(USBDevice *dev, int request, int value,
                int index, int length, uint8_t *data)
{
    USBNetState *s = (USBNetState *) dev;
    int ret = 0;

    switch(request) {
    case DeviceRequest | USB_REQ_GET_STATUS:
        data[0] = (1 << USB_DEVICE_SELF_POWERED) |
                (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
        data[1] = 0x00;
        ret = 2;
        break;

    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
        if (value == USB_DEVICE_REMOTE_WAKEUP) {
            dev->remote_wakeup = 0;
        } else {
            goto fail;
        }
        ret = 0;
        break;

    case DeviceOutRequest | USB_REQ_SET_FEATURE:
        if (value == USB_DEVICE_REMOTE_WAKEUP) {
            dev->remote_wakeup = 1;
        } else {
            goto fail;
        }
        ret = 0;
        break;

    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
        dev->addr = value;
        ret = 0;
        break;

    case ClassInterfaceOutRequest | USB_CDC_SEND_ENCAPSULATED_COMMAND:
        if (!s->rndis || value || index != 0)
            goto fail;
#ifdef TRAFFIC_DEBUG
        {
            unsigned int i;
            fprintf(stderr, "SEND_ENCAPSULATED_COMMAND:");
            for (i = 0; i < length; i++) {
                if (!(i & 15))
                    fprintf(stderr, "\n%04x:", i);
                fprintf(stderr, " %02x", data[i]);
            }
            fprintf(stderr, "\n\n");
        }
#endif
        ret = rndis_parse(s, data, length);
        break;

    case ClassInterfaceRequest | USB_CDC_GET_ENCAPSULATED_RESPONSE:
        if (!s->rndis || value || index != 0)
            goto fail;
        ret = rndis_get_response(s, data);
        if (!ret) {
            data[0] = 0;
            ret = 1;
        }
#ifdef TRAFFIC_DEBUG
        {
            unsigned int i;
            fprintf(stderr, "GET_ENCAPSULATED_RESPONSE:");
            for (i = 0; i < ret; i++) {
                if (!(i & 15))
                    fprintf(stderr, "\n%04x:", i);
                fprintf(stderr, " %02x", data[i]);
            }
            fprintf(stderr, "\n\n");
        }
#endif
        break;

    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
        switch(value >> 8) {
        case USB_DT_DEVICE:
            ret = sizeof(qemu_net_dev_descriptor);
            memcpy(data, qemu_net_dev_descriptor, ret);
            break;

        case USB_DT_CONFIG:
            switch (value & 0xff) {
            case 0:
                ret = sizeof(qemu_net_rndis_config_descriptor);
                memcpy(data, qemu_net_rndis_config_descriptor, ret);
                break;

            case 1:
                ret = sizeof(qemu_net_cdc_config_descriptor);
                memcpy(data, qemu_net_cdc_config_descriptor, ret);
                break;

            default:
                goto fail;
            }

            data[2] = ret & 0xff;
            data[3] = ret >> 8;
            break;

        case USB_DT_STRING:
            switch (value & 0xff) {
            case 0:
                /* language ids */
                data[0] = 4;
                data[1] = 3;
                data[2] = 0x09;
                data[3] = 0x04;
                ret = 4;
                break;

            case STRING_ETHADDR:
                ret = set_usb_string(data, s->usbstring_mac);
                break;

            default:
                if (usb_net_stringtable[value & 0xff]) {
                    ret = set_usb_string(data,
                                    usb_net_stringtable[value & 0xff]);
                    break;
                }

                goto fail;
            }
            break;

        default:
            goto fail;
        }
        break;

    case DeviceRequest | USB_REQ_GET_CONFIGURATION:
        data[0] = s->rndis ? DEV_RNDIS_CONFIG_VALUE : DEV_CONFIG_VALUE;
        ret = 1;
        break;

    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
        switch (value & 0xff) {
        case DEV_CONFIG_VALUE:
            s->rndis = 0;
            break;

        case DEV_RNDIS_CONFIG_VALUE:
            s->rndis = 1;
            break;

        default:
            goto fail;
        }
        ret = 0;
        break;

    case DeviceRequest | USB_REQ_GET_INTERFACE:
    case InterfaceRequest | USB_REQ_GET_INTERFACE:
        data[0] = 0;
        ret = 1;
        break;

    case DeviceOutRequest | USB_REQ_SET_INTERFACE:
    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
        ret = 0;
        break;

    default:
    fail:
        fprintf(stderr, "usbnet: failed control transaction: "
                        "request 0x%x value 0x%x index 0x%x length 0x%x\n",
                        request, value, index, length);
        ret = USB_RET_STALL;
        break;
    }
    return ret;
}

static int usb_net_handle_statusin(USBNetState *s, USBPacket *p)
{
    int ret = 8;

    if (p->len < 8)
        return USB_RET_STALL;

    ((le32 *) p->data)[0] = cpu_to_le32(1);
    ((le32 *) p->data)[1] = cpu_to_le32(0);
    if (!s->rndis_resp.tqh_first)
        ret = USB_RET_NAK;

#ifdef TRAFFIC_DEBUG
    fprintf(stderr, "usbnet: interrupt poll len %u return %d", p->len, ret);
    {
        int i;
        fprintf(stderr, ":");
        for (i = 0; i < ret; i++) {
            if (!(i & 15))
                fprintf(stderr, "\n%04x:", i);
            fprintf(stderr, " %02x", p->data[i]);
        }
        fprintf(stderr, "\n\n");
    }
#endif

    return ret;
}

static int usb_net_handle_datain(USBNetState *s, USBPacket *p)
{
    int ret = USB_RET_NAK;

    if (s->in_ptr > s->in_len) {
        s->in_ptr = s->in_len = 0;
        ret = USB_RET_NAK;
        return ret;
    }
    if (!s->in_len) {
        ret = USB_RET_NAK;
        return ret;
    }
    ret = s->in_len - s->in_ptr;
    if (ret > p->len)
        ret = p->len;
    memcpy(p->data, &s->in_buf[s->in_ptr], ret);
    s->in_ptr += ret;
    if (s->in_ptr >= s->in_len &&
                    (s->rndis || (s->in_len & (64 - 1)) || !ret)) {
        /* no short packet necessary */
        s->in_ptr = s->in_len = 0;
    }

#ifdef TRAFFIC_DEBUG
    fprintf(stderr, "usbnet: data in len %u return %d", p->len, ret);
    {
        int i;
        fprintf(stderr, ":");
        for (i = 0; i < ret; i++) {
            if (!(i & 15))
                fprintf(stderr, "\n%04x:", i);
            fprintf(stderr, " %02x", p->data[i]);
        }
        fprintf(stderr, "\n\n");
    }
#endif

    return ret;
}

static int usb_net_handle_dataout(USBNetState *s, USBPacket *p)
{
    int ret = p->len;
    int sz = sizeof(s->out_buf) - s->out_ptr;
    struct rndis_packet_msg_type *msg =
            (struct rndis_packet_msg_type *) s->out_buf;
    uint32_t len;

#ifdef TRAFFIC_DEBUG
    fprintf(stderr, "usbnet: data out len %u\n", p->len);
    {
        int i;
        fprintf(stderr, ":");
        for (i = 0; i < p->len; i++) {
            if (!(i & 15))
                fprintf(stderr, "\n%04x:", i);
            fprintf(stderr, " %02x", p->data[i]);
        }
        fprintf(stderr, "\n\n");
    }
#endif

    if (sz > ret)
        sz = ret;
    memcpy(&s->out_buf[s->out_ptr], p->data, sz);
    s->out_ptr += sz;

    if (!s->rndis) {
        if (ret < 64) {
            qemu_send_packet(s->vc, s->out_buf, s->out_ptr);
            s->out_ptr = 0;
        }
        return ret;
    }
    len = le32_to_cpu(msg->MessageLength);
    if (s->out_ptr < 8 || s->out_ptr < len)
        return ret;
    if (le32_to_cpu(msg->MessageType) == RNDIS_PACKET_MSG) {
        uint32_t offs = 8 + le32_to_cpu(msg->DataOffset);
        uint32_t size = le32_to_cpu(msg->DataLength);
        if (offs + size <= len)
            qemu_send_packet(s->vc, s->out_buf + offs, size);
    }
    s->out_ptr -= len;
    memmove(s->out_buf, &s->out_buf[len], s->out_ptr);

    return ret;
}

static int usb_net_handle_data(USBDevice *dev, USBPacket *p)
{
    USBNetState *s = (USBNetState *) dev;
    int ret = 0;

    switch(p->pid) {
    case USB_TOKEN_IN:
        switch (p->devep) {
        case 1:
            ret = usb_net_handle_statusin(s, p);
            break;

        case 2:
            ret = usb_net_handle_datain(s, p);
            break;

        default:
            goto fail;
        }
        break;

    case USB_TOKEN_OUT:
        switch (p->devep) {
        case 2:
            ret = usb_net_handle_dataout(s, p);
            break;

        default:
            goto fail;
        }
        break;

    default:
    fail:
        ret = USB_RET_STALL;
        break;
    }
    if (ret == USB_RET_STALL)
        fprintf(stderr, "usbnet: failed data transaction: "
                        "pid 0x%x ep 0x%x len 0x%x\n",
                        p->pid, p->devep, p->len);
    return ret;
}

static void usbnet_receive(void *opaque, const uint8_t *buf, int size)
{
    USBNetState *s = opaque;
    struct rndis_packet_msg_type *msg;

    if (s->rndis) {
        msg = (struct rndis_packet_msg_type *) s->in_buf;
        if (!s->rndis_state == RNDIS_DATA_INITIALIZED)
            return;
        if (size + sizeof(struct rndis_packet_msg_type) > sizeof(s->in_buf))
            return;

        memset(msg, 0, sizeof(struct rndis_packet_msg_type));
        msg->MessageType = cpu_to_le32(RNDIS_PACKET_MSG);
        msg->MessageLength = cpu_to_le32(size + sizeof(struct rndis_packet_msg_type));
        msg->DataOffset = cpu_to_le32(sizeof(struct rndis_packet_msg_type) - 8);
        msg->DataLength = cpu_to_le32(size);
        /* msg->OOBDataOffset;
         * msg->OOBDataLength;
         * msg->NumOOBDataElements;
         * msg->PerPacketInfoOffset;
         * msg->PerPacketInfoLength;
         * msg->VcHandle;
         * msg->Reserved;
         */
        memcpy(msg + 1, buf, size);
        s->in_len = size + sizeof(struct rndis_packet_msg_type);
    } else {
        if (size > sizeof(s->in_buf))
            return;
        memcpy(s->in_buf, buf, size);
        s->in_len = size;
    }
    s->in_ptr = 0;
}

static int usbnet_can_receive(void *opaque)
{
    USBNetState *s = opaque;

    if (s->rndis && !s->rndis_state == RNDIS_DATA_INITIALIZED)
        return 1;

    return !s->in_len;
}

static void usb_net_handle_destroy(USBDevice *dev)
{
    USBNetState *s = (USBNetState *) dev;

    /* TODO: remove the nd_table[] entry */
    qemu_del_vlan_client(s->vc);
    rndis_clear_responsequeue(s);
    qemu_free(s);
}

USBDevice *usb_net_init(NICInfo *nd)
{
    USBNetState *s;

    s = qemu_mallocz(sizeof(USBNetState));
    if (!s)
        return NULL;
    s->dev.speed = USB_SPEED_FULL;
    s->dev.handle_packet = usb_generic_handle_packet;

    s->dev.handle_reset = usb_net_handle_reset;
    s->dev.handle_control = usb_net_handle_control;
    s->dev.handle_data = usb_net_handle_data;
    s->dev.handle_destroy = usb_net_handle_destroy;

    s->rndis = 1;
    s->rndis_state = RNDIS_UNINITIALIZED;
    s->medium = 0;	/* NDIS_MEDIUM_802_3 */
    s->speed = 1000000; /* 100MBps, in 100Bps units */
    s->media_state = 0;	/* NDIS_MEDIA_STATE_CONNECTED */;
    s->filter = 0;
    s->vendorid = 0x1234;

    memcpy(s->mac, nd->macaddr, 6);
    TAILQ_INIT(&s->rndis_resp);

    pstrcpy(s->dev.devname, sizeof(s->dev.devname),
                    "QEMU USB Network Interface");
    s->vc = qemu_new_vlan_client(nd->vlan,
                    usbnet_receive, usbnet_can_receive, s);

    snprintf(s->usbstring_mac, sizeof(s->usbstring_mac),
                    "%02x%02x%02x%02x%02x%02x",
                    0x40, s->mac[1], s->mac[2],
                    s->mac[3], s->mac[4], s->mac[5]);
    snprintf(s->vc->info_str, sizeof(s->vc->info_str),
                    "usbnet macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
                    s->mac[0], s->mac[1], s->mac[2],
                    s->mac[3], s->mac[4], s->mac[5]);
    fprintf(stderr, "usbnet: initialized mac %02x:%02x:%02x:%02x:%02x:%02x\n",
                    s->mac[0], s->mac[1], s->mac[2],
                    s->mac[3], s->mac[4], s->mac[5]);

    return (USBDevice *) s;
}