text: /*
   * RNDIS MSG parser
   *
   * Authors:	Benedikt Spranger, Pengutronix
   *		Robert Schwebel, Pengutronix
   *
   *              This program is free software; you can redistribute it and/or
   *              modify it under the terms of the GNU General Public License
   *              version 2, as published by the Free Software Foundation.
   *
   *		This software was originally developed in conformance with
   *		Microsoft's Remote NDIS Specification License Agreement.
   *
   * 03/12/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
   *		Fixed message length bug in init_response
   *
   * 03/25/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
   *		Fixed rndis_rm_hdr length bug.
   *
   * Copyright (C) 2004 by David Brownell
   *		updates to merge with Linux 2.6, better match RNDIS spec
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/kernel.h>
  #include <linux/errno.h>
  #include <linux/idr.h>
  #include <linux/list.h>
  #include <linux/proc_fs.h>
  #include <linux/slab.h>
  #include <linux/seq_file.h>
  #include <linux/netdevice.h>
  
  #include <asm/io.h>
  #include <asm/byteorder.h>
  #include <asm/unaligned.h>
  
  #include "u_rndis.h"
  
  #undef	VERBOSE_DEBUG
  
  #include "rndis.h"
  
  
  /* The driver for your USB chip needs to support ep0 OUT to work with
   * RNDIS, plus all three CDC Ethernet endpoints (interrupt not optional).
   *
   * Windows hosts need an INF file like Documentation/usb/linux.inf
   * and will be happier if you provide the host_addr module parameter.
   */
  
  #if 0
  static int rndis_debug = 0;
  module_param (rndis_debug, int, 0);
  MODULE_PARM_DESC (rndis_debug, "enable debugging");
  #else
  #define rndis_debug		0
  #endif
  
  #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  
  #define	NAME_TEMPLATE "driver/rndis-%03d"
  
  #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
  
  static DEFINE_IDA(rndis_ida);
  
  /* Driver Version */
  static const __le32 rndis_driver_version = cpu_to_le32(1);
  
  /* Function Prototypes */
  static rndis_resp_t *rndis_add_response(struct rndis_params *params,
  					u32 length);
  
  #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  
  static const struct file_operations rndis_proc_fops;
  
  #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
  
  /* supported OIDs */
  static const u32 oid_supported_list[] = {
  	/* the general stuff */
  	RNDIS_OID_GEN_SUPPORTED_LIST,
  	RNDIS_OID_GEN_HARDWARE_STATUS,
  	RNDIS_OID_GEN_MEDIA_SUPPORTED,
  	RNDIS_OID_GEN_MEDIA_IN_USE,
  	RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
  	RNDIS_OID_GEN_LINK_SPEED,
  	RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE,
  	RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE,
  	RNDIS_OID_GEN_VENDOR_ID,
  	RNDIS_OID_GEN_VENDOR_DESCRIPTION,
  	RNDIS_OID_GEN_VENDOR_DRIVER_VERSION,
  	RNDIS_OID_GEN_CURRENT_PACKET_FILTER,
  	RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE,
  	RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
  	RNDIS_OID_GEN_PHYSICAL_MEDIUM,
  
  	/* the statistical stuff */
  	RNDIS_OID_GEN_XMIT_OK,
  	RNDIS_OID_GEN_RCV_OK,
  	RNDIS_OID_GEN_XMIT_ERROR,
  	RNDIS_OID_GEN_RCV_ERROR,
  	RNDIS_OID_GEN_RCV_NO_BUFFER,
  #ifdef	RNDIS_OPTIONAL_STATS
  	RNDIS_OID_GEN_DIRECTED_BYTES_XMIT,
  	RNDIS_OID_GEN_DIRECTED_FRAMES_XMIT,
  	RNDIS_OID_GEN_MULTICAST_BYTES_XMIT,
  	RNDIS_OID_GEN_MULTICAST_FRAMES_XMIT,
  	RNDIS_OID_GEN_BROADCAST_BYTES_XMIT,
  	RNDIS_OID_GEN_BROADCAST_FRAMES_XMIT,
  	RNDIS_OID_GEN_DIRECTED_BYTES_RCV,
  	RNDIS_OID_GEN_DIRECTED_FRAMES_RCV,
  	RNDIS_OID_GEN_MULTICAST_BYTES_RCV,
  	RNDIS_OID_GEN_MULTICAST_FRAMES_RCV,
  	RNDIS_OID_GEN_BROADCAST_BYTES_RCV,
  	RNDIS_OID_GEN_BROADCAST_FRAMES_RCV,
  	RNDIS_OID_GEN_RCV_CRC_ERROR,
  	RNDIS_OID_GEN_TRANSMIT_QUEUE_LENGTH,
  #endif	/* RNDIS_OPTIONAL_STATS */
  
  	/* mandatory 802.3 */
  	/* the general stuff */
  	RNDIS_OID_802_3_PERMANENT_ADDRESS,
  	RNDIS_OID_802_3_CURRENT_ADDRESS,
  	RNDIS_OID_802_3_MULTICAST_LIST,
  	RNDIS_OID_802_3_MAC_OPTIONS,
  	RNDIS_OID_802_3_MAXIMUM_LIST_SIZE,
  
  	/* the statistical stuff */
  	RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT,
  	RNDIS_OID_802_3_XMIT_ONE_COLLISION,
  	RNDIS_OID_802_3_XMIT_MORE_COLLISIONS,
  #ifdef	RNDIS_OPTIONAL_STATS
  	RNDIS_OID_802_3_XMIT_DEFERRED,
  	RNDIS_OID_802_3_XMIT_MAX_COLLISIONS,
  	RNDIS_OID_802_3_RCV_OVERRUN,
  	RNDIS_OID_802_3_XMIT_UNDERRUN,
  	RNDIS_OID_802_3_XMIT_HEARTBEAT_FAILURE,
  	RNDIS_OID_802_3_XMIT_TIMES_CRS_LOST,
  	RNDIS_OID_802_3_XMIT_LATE_COLLISIONS,
  #endif	/* RNDIS_OPTIONAL_STATS */
  
  #ifdef	RNDIS_PM
  	/* PM and wakeup are "mandatory" for USB, but the RNDIS specs
  	 * don't say what they mean ... and the NDIS specs are often
  	 * confusing and/or ambiguous in this context.  (That is, more
  	 * so than their specs for the other OIDs.)
  	 *
  	 * FIXME someone who knows what these should do, please
  	 * implement them!
  	 */
  
  	/* power management */
  	OID_PNP_CAPABILITIES,
  	OID_PNP_QUERY_POWER,
  	OID_PNP_SET_POWER,
  
  #ifdef	RNDIS_WAKEUP
  	/* wake up host */
  	OID_PNP_ENABLE_WAKE_UP,
  	OID_PNP_ADD_WAKE_UP_PATTERN,
  	OID_PNP_REMOVE_WAKE_UP_PATTERN,
  #endif	/* RNDIS_WAKEUP */
  #endif	/* RNDIS_PM */
  };
  
  
  /* NDIS Functions */
  static int gen_ndis_query_resp(struct rndis_params *params, u32 OID, u8 *buf,
  			       unsigned buf_len, rndis_resp_t *r)
  {
  	int retval = -ENOTSUPP;
  	u32 length = 4;	/* usually */
  	__le32 *outbuf;
  	int i, count;
  	rndis_query_cmplt_type *resp;
  	struct net_device *net;
  	struct rtnl_link_stats64 temp;
  	const struct rtnl_link_stats64 *stats;
  
  	if (!r) return -ENOMEM;
  	resp = (rndis_query_cmplt_type *)r->buf;
  
  	if (!resp) return -ENOMEM;
  
  	if (buf_len && rndis_debug > 1) {
  		pr_debug("query OID %08x value, len %d:\n", OID, buf_len);
  		for (i = 0; i < buf_len; i += 16) {
  			pr_debug("%03d: %08x %08x %08x %08x\n", i,
  				get_unaligned_le32(&buf[i]),
  				get_unaligned_le32(&buf[i + 4]),
  				get_unaligned_le32(&buf[i + 8]),
  				get_unaligned_le32(&buf[i + 12]));
  		}
  	}
  
  	/* response goes here, right after the header */
  	outbuf = (__le32 *)&resp[1];
  	resp->InformationBufferOffset = cpu_to_le32(16);
  
  	net = params->dev;
  	stats = dev_get_stats(net, &temp);
  
  	switch (OID) {
  
  	/* general oids (table 4-1) */
  
  	/* mandatory */
  	case RNDIS_OID_GEN_SUPPORTED_LIST:
  		pr_debug("%s: RNDIS_OID_GEN_SUPPORTED_LIST\n", __func__);
  		length = sizeof(oid_supported_list);
  		count  = length / sizeof(u32);
  		for (i = 0; i < count; i++)
  			outbuf[i] = cpu_to_le32(oid_supported_list[i]);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_HARDWARE_STATUS:
  		pr_debug("%s: RNDIS_OID_GEN_HARDWARE_STATUS\n", __func__);
  		/* Bogus question!
  		 * Hardware must be ready to receive high level protocols.
  		 * BTW:
  		 * reddite ergo quae sunt Caesaris Caesari
  		 * et quae sunt Dei Deo!
  		 */
  		*outbuf = cpu_to_le32(0);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_MEDIA_SUPPORTED:
  		pr_debug("%s: RNDIS_OID_GEN_MEDIA_SUPPORTED\n", __func__);
  		*outbuf = cpu_to_le32(params->medium);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_MEDIA_IN_USE:
  		pr_debug("%s: RNDIS_OID_GEN_MEDIA_IN_USE\n", __func__);
  		/* one medium, one transport... (maybe you do it better) */
  		*outbuf = cpu_to_le32(params->medium);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE:
  		pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE\n", __func__);
  		if (params->dev) {
  			*outbuf = cpu_to_le32(params->dev->mtu);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_LINK_SPEED:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_LINK_SPEED\n", __func__);
  		if (params->media_state == RNDIS_MEDIA_STATE_DISCONNECTED)
  			*outbuf = cpu_to_le32(0);
  		else
  			*outbuf = cpu_to_le32(params->speed);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE:
  		pr_debug("%s: RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE\n", __func__);
  		if (params->dev) {
  			*outbuf = cpu_to_le32(params->dev->mtu);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE:
  		pr_debug("%s: RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE\n", __func__);
  		if (params->dev) {
  			*outbuf = cpu_to_le32(params->dev->mtu);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_VENDOR_ID:
  		pr_debug("%s: RNDIS_OID_GEN_VENDOR_ID\n", __func__);
  		*outbuf = cpu_to_le32(params->vendorID);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_VENDOR_DESCRIPTION:
  		pr_debug("%s: RNDIS_OID_GEN_VENDOR_DESCRIPTION\n", __func__);
  		if (params->vendorDescr) {
  			length = strlen(params->vendorDescr);
  			memcpy(outbuf, params->vendorDescr, length);
  		} else {
  			outbuf[0] = 0;
  		}
  		retval = 0;
  		break;
  
  	case RNDIS_OID_GEN_VENDOR_DRIVER_VERSION:
  		pr_debug("%s: RNDIS_OID_GEN_VENDOR_DRIVER_VERSION\n", __func__);
  		/* Created as LE */
  		*outbuf = rndis_driver_version;
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_CURRENT_PACKET_FILTER:
  		pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER\n", __func__);
  		*outbuf = cpu_to_le32(*params->filter);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE:
  		pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE\n", __func__);
  		*outbuf = cpu_to_le32(RNDIS_MAX_TOTAL_SIZE);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_MEDIA_CONNECT_STATUS:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_MEDIA_CONNECT_STATUS\n", __func__);
  		*outbuf = cpu_to_le32(params->media_state);
  		retval = 0;
  		break;
  
  	case RNDIS_OID_GEN_PHYSICAL_MEDIUM:
  		pr_debug("%s: RNDIS_OID_GEN_PHYSICAL_MEDIUM\n", __func__);
  		*outbuf = cpu_to_le32(0);
  		retval = 0;
  		break;
  
  	/* The RNDIS specification is incomplete/wrong.   Some versions
  	 * of MS-Windows expect OIDs that aren't specified there.  Other
  	 * versions emit undefined RNDIS messages. DOCUMENT ALL THESE!
  	 */
  	case RNDIS_OID_GEN_MAC_OPTIONS:		/* from WinME */
  		pr_debug("%s: RNDIS_OID_GEN_MAC_OPTIONS\n", __func__);
  		*outbuf = cpu_to_le32(
  			  RNDIS_MAC_OPTION_RECEIVE_SERIALIZED
  			| RNDIS_MAC_OPTION_FULL_DUPLEX);
  		retval = 0;
  		break;
  
  	/* statistics OIDs (table 4-2) */
  
  	/* mandatory */
  	case RNDIS_OID_GEN_XMIT_OK:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_XMIT_OK\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->tx_packets
  				- stats->tx_errors - stats->tx_dropped);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_RCV_OK:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_RCV_OK\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->rx_packets
  				- stats->rx_errors - stats->rx_dropped);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_XMIT_ERROR:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_XMIT_ERROR\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->tx_errors);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_RCV_ERROR:
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_OID_GEN_RCV_ERROR\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->rx_errors);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_GEN_RCV_NO_BUFFER:
  		pr_debug("%s: RNDIS_OID_GEN_RCV_NO_BUFFER\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->rx_dropped);
  			retval = 0;
  		}
  		break;
  
  	/* ieee802.3 OIDs (table 4-3) */
  
  	/* mandatory */
  	case RNDIS_OID_802_3_PERMANENT_ADDRESS:
  		pr_debug("%s: RNDIS_OID_802_3_PERMANENT_ADDRESS\n", __func__);
  		if (params->dev) {
  			length = ETH_ALEN;
  			memcpy(outbuf, params->host_mac, length);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_802_3_CURRENT_ADDRESS:
  		pr_debug("%s: RNDIS_OID_802_3_CURRENT_ADDRESS\n", __func__);
  		if (params->dev) {
  			length = ETH_ALEN;
  			memcpy(outbuf, params->host_mac, length);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_802_3_MULTICAST_LIST:
  		pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__);
  		/* Multicast base address only */
  		*outbuf = cpu_to_le32(0xE0000000);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_802_3_MAXIMUM_LIST_SIZE:
  		pr_debug("%s: RNDIS_OID_802_3_MAXIMUM_LIST_SIZE\n", __func__);
  		/* Multicast base address only */
  		*outbuf = cpu_to_le32(1);
  		retval = 0;
  		break;
  
  	case RNDIS_OID_802_3_MAC_OPTIONS:
  		pr_debug("%s: RNDIS_OID_802_3_MAC_OPTIONS\n", __func__);
  		*outbuf = cpu_to_le32(0);
  		retval = 0;
  		break;
  
  	/* ieee802.3 statistics OIDs (table 4-4) */
  
  	/* mandatory */
  	case RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT:
  		pr_debug("%s: RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT\n", __func__);
  		if (stats) {
  			*outbuf = cpu_to_le32(stats->rx_frame_errors);
  			retval = 0;
  		}
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_802_3_XMIT_ONE_COLLISION:
  		pr_debug("%s: RNDIS_OID_802_3_XMIT_ONE_COLLISION\n", __func__);
  		*outbuf = cpu_to_le32(0);
  		retval = 0;
  		break;
  
  	/* mandatory */
  	case RNDIS_OID_802_3_XMIT_MORE_COLLISIONS:
  		pr_debug("%s: RNDIS_OID_802_3_XMIT_MORE_COLLISIONS\n", __func__);
  		*outbuf = cpu_to_le32(0);
  		retval = 0;
  		break;
  
  	default:
  		pr_warn("%s: query unknown OID 0x%08X\n", __func__, OID);
  	}
  	if (retval < 0)
  		length = 0;
  
  	resp->InformationBufferLength = cpu_to_le32(length);
  	r->length = length + sizeof(*resp);
  	resp->MessageLength = cpu_to_le32(r->length);
  	return retval;
  }
  
  static int gen_ndis_set_resp(struct rndis_params *params, u32 OID,
  			     u8 *buf, u32 buf_len, rndis_resp_t *r)
  {
  	rndis_set_cmplt_type *resp;
  	int i, retval = -ENOTSUPP;
  
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_set_cmplt_type *)r->buf;
  	if (!resp)
  		return -ENOMEM;
  
  	if (buf_len && rndis_debug > 1) {
  		pr_debug("set OID %08x value, len %d:\n", OID, buf_len);
  		for (i = 0; i < buf_len; i += 16) {
  			pr_debug("%03d: %08x %08x %08x %08x\n", i,
  				get_unaligned_le32(&buf[i]),
  				get_unaligned_le32(&buf[i + 4]),
  				get_unaligned_le32(&buf[i + 8]),
  				get_unaligned_le32(&buf[i + 12]));
  		}
  	}
  
  	switch (OID) {
  	case RNDIS_OID_GEN_CURRENT_PACKET_FILTER:
  
  		/* these NDIS_PACKET_TYPE_* bitflags are shared with
  		 * cdc_filter; it's not RNDIS-specific
  		 * NDIS_PACKET_TYPE_x == USB_CDC_PACKET_TYPE_x for x in:
  		 *	PROMISCUOUS, DIRECTED,
  		 *	MULTICAST, ALL_MULTICAST, BROADCAST
  		 */
  		*params->filter = (u16)get_unaligned_le32(buf);
  		pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER %08x\n",
  			__func__, *params->filter);
  
  		/* this call has a significant side effect:  it's
  		 * what makes the packet flow start and stop, like
  		 * activating the CDC Ethernet altsetting.
  		 */
  		retval = 0;
  		if (*params->filter) {
  			params->state = RNDIS_DATA_INITIALIZED;
  			netif_carrier_on(params->dev);
  			if (netif_running(params->dev))
  				netif_wake_queue(params->dev);
  		} else {
  			params->state = RNDIS_INITIALIZED;
  			netif_carrier_off(params->dev);
  			netif_stop_queue(params->dev);
  		}
  		break;
  
  	case RNDIS_OID_802_3_MULTICAST_LIST:
  		/* I think we can ignore this */
  		pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__);
  		retval = 0;
  		break;
  
  	default:
  		pr_warn("%s: set unknown OID 0x%08X, size %d\n",
  			__func__, OID, buf_len);
  	}
  
  	return retval;
  }
  
  /*
   * Response Functions
   */
  
  static int rndis_init_response(struct rndis_params *params,
  			       rndis_init_msg_type *buf)
  {
  	rndis_init_cmplt_type *resp;
  	rndis_resp_t *r;
  
  	if (!params->dev)
  		return -ENOTSUPP;
  
  	r = rndis_add_response(params, sizeof(rndis_init_cmplt_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_init_cmplt_type *)r->buf;
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_INIT_C);
  	resp->MessageLength = cpu_to_le32(52);
  	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(
  		  params->dev->mtu
  		+ sizeof(struct ethhdr)
  		+ 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);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  static int rndis_query_response(struct rndis_params *params,
  				rndis_query_msg_type *buf)
  {
  	rndis_query_cmplt_type *resp;
  	rndis_resp_t *r;
  
  	/* pr_debug("%s: OID = %08X\n", __func__, cpu_to_le32(buf->OID)); */
  	if (!params->dev)
  		return -ENOTSUPP;
  
  	/*
  	 * we need more memory:
  	 * gen_ndis_query_resp expects enough space for
  	 * rndis_query_cmplt_type followed by data.
  	 * oid_supported_list is the largest data reply
  	 */
  	r = rndis_add_response(params,
  		sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_query_cmplt_type *)r->buf;
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_QUERY_C);
  	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
  
  	if (gen_ndis_query_resp(params, le32_to_cpu(buf->OID),
  			le32_to_cpu(buf->InformationBufferOffset)
  					+ 8 + (u8 *)buf,
  			le32_to_cpu(buf->InformationBufferLength),
  			r)) {
  		/* OID not supported */
  		resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
  		resp->MessageLength = cpu_to_le32(sizeof *resp);
  		resp->InformationBufferLength = cpu_to_le32(0);
  		resp->InformationBufferOffset = cpu_to_le32(0);
  	} else
  		resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  static int rndis_set_response(struct rndis_params *params,
  			      rndis_set_msg_type *buf)
  {
  	u32 BufLength, BufOffset;
  	rndis_set_cmplt_type *resp;
  	rndis_resp_t *r;
  
  	r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_set_cmplt_type *)r->buf;
  
  	BufLength = le32_to_cpu(buf->InformationBufferLength);
  	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
  
  #ifdef	VERBOSE_DEBUG
  	pr_debug("%s: Length: %d\n", __func__, BufLength);
  	pr_debug("%s: Offset: %d\n", __func__, BufOffset);
  	pr_debug("%s: InfoBuffer: ", __func__);
  
  	for (i = 0; i < BufLength; i++) {
  		pr_debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset));
  	}
  
  	pr_debug("\n");
  #endif
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_SET_C);
  	resp->MessageLength = cpu_to_le32(16);
  	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
  	if (gen_ndis_set_resp(params, le32_to_cpu(buf->OID),
  			((u8 *)buf) + 8 + BufOffset, BufLength, r))
  		resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
  	else
  		resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  static int rndis_reset_response(struct rndis_params *params,
  				rndis_reset_msg_type *buf)
  {
  	rndis_reset_cmplt_type *resp;
  	rndis_resp_t *r;
  	u8 *xbuf;
  	u32 length;
  
  	/* drain the response queue */
  	while ((xbuf = rndis_get_next_response(params, &length)))
  		rndis_free_response(params, xbuf);
  
  	r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_reset_cmplt_type *)r->buf;
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_RESET_C);
  	resp->MessageLength = cpu_to_le32(16);
  	resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
  	/* resent information */
  	resp->AddressingReset = cpu_to_le32(1);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  static int rndis_keepalive_response(struct rndis_params *params,
  				    rndis_keepalive_msg_type *buf)
  {
  	rndis_keepalive_cmplt_type *resp;
  	rndis_resp_t *r;
  
  	/* host "should" check only in RNDIS_DATA_INITIALIZED state */
  
  	r = rndis_add_response(params, sizeof(rndis_keepalive_cmplt_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_keepalive_cmplt_type *)r->buf;
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
  	resp->MessageLength = cpu_to_le32(16);
  	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
  	resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  
  /*
   * Device to Host Comunication
   */
  static int rndis_indicate_status_msg(struct rndis_params *params, u32 status)
  {
  	rndis_indicate_status_msg_type *resp;
  	rndis_resp_t *r;
  
  	if (params->state == RNDIS_UNINITIALIZED)
  		return -ENOTSUPP;
  
  	r = rndis_add_response(params, sizeof(rndis_indicate_status_msg_type));
  	if (!r)
  		return -ENOMEM;
  	resp = (rndis_indicate_status_msg_type *)r->buf;
  
  	resp->MessageType = cpu_to_le32(RNDIS_MSG_INDICATE);
  	resp->MessageLength = cpu_to_le32(20);
  	resp->Status = cpu_to_le32(status);
  	resp->StatusBufferLength = cpu_to_le32(0);
  	resp->StatusBufferOffset = cpu_to_le32(0);
  
  	params->resp_avail(params->v);
  	return 0;
  }
  
  int rndis_signal_connect(struct rndis_params *params)
  {
  	params->media_state = RNDIS_MEDIA_STATE_CONNECTED;
  	return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_CONNECT);
  }
  EXPORT_SYMBOL_GPL(rndis_signal_connect);
  
  int rndis_signal_disconnect(struct rndis_params *params)
  {
  	params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
  	return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_DISCONNECT);
  }
  EXPORT_SYMBOL_GPL(rndis_signal_disconnect);
  
  void rndis_uninit(struct rndis_params *params)
  {
  	u8 *buf;
  	u32 length;
  
  	if (!params)
  		return;
  	params->state = RNDIS_UNINITIALIZED;
  
  	/* drain the response queue */
  	while ((buf = rndis_get_next_response(params, &length)))
  		rndis_free_response(params, buf);
  }
  EXPORT_SYMBOL_GPL(rndis_uninit);
  
  void rndis_set_host_mac(struct rndis_params *params, const u8 *addr)
  {
  	params->host_mac = addr;
  }
  EXPORT_SYMBOL_GPL(rndis_set_host_mac);
  
  /*
   * Message Parser
   */
  int rndis_msg_parser(struct rndis_params *params, u8 *buf)
  {
  	u32 MsgType, MsgLength;
  	__le32 *tmp;
  
  	if (!buf)
  		return -ENOMEM;
  
  	tmp = (__le32 *)buf;
  	MsgType   = get_unaligned_le32(tmp++);
  	MsgLength = get_unaligned_le32(tmp++);
  
  	if (!params)
  		return -ENOTSUPP;
  
  	/* NOTE: RNDIS is *EXTREMELY* chatty ... Windows constantly polls for
  	 * rx/tx statistics and link status, in addition to KEEPALIVE traffic
  	 * and normal HC level polling to see if there's any IN traffic.
  	 */
  
  	/* For USB: responses may take up to 10 seconds */
  	switch (MsgType) {
  	case RNDIS_MSG_INIT:
  		pr_debug("%s: RNDIS_MSG_INIT\n",
  			__func__);
  		params->state = RNDIS_INITIALIZED;
  		return rndis_init_response(params, (rndis_init_msg_type *)buf);
  
  	case RNDIS_MSG_HALT:
  		pr_debug("%s: RNDIS_MSG_HALT\n",
  			__func__);
  		params->state = RNDIS_UNINITIALIZED;
  		if (params->dev) {
  			netif_carrier_off(params->dev);
  			netif_stop_queue(params->dev);
  		}
  		return 0;
  
  	case RNDIS_MSG_QUERY:
  		return rndis_query_response(params,
  					(rndis_query_msg_type *)buf);
  
  	case RNDIS_MSG_SET:
  		return rndis_set_response(params, (rndis_set_msg_type *)buf);
  
  	case RNDIS_MSG_RESET:
  		pr_debug("%s: RNDIS_MSG_RESET\n",
  			__func__);
  		return rndis_reset_response(params,
  					(rndis_reset_msg_type *)buf);
  
  	case RNDIS_MSG_KEEPALIVE:
  		/* For USB: host does this every 5 seconds */
  		if (rndis_debug > 1)
  			pr_debug("%s: RNDIS_MSG_KEEPALIVE\n",
  				__func__);
  		return rndis_keepalive_response(params,
  						 (rndis_keepalive_msg_type *)
  						 buf);
  
  	default:
  		/* At least Windows XP emits some undefined RNDIS messages.
  		 * In one case those messages seemed to relate to the host
  		 * suspending itself.
  		 */
  		pr_warn("%s: unknown RNDIS message 0x%08X len %d\n",
  			__func__, MsgType, MsgLength);
  		print_hex_dump_bytes(__func__, DUMP_PREFIX_OFFSET,
  				     buf, MsgLength);
  		break;
  	}
  
  	return -ENOTSUPP;
  }
  EXPORT_SYMBOL_GPL(rndis_msg_parser);
  
  static inline int rndis_get_nr(void)
  {
  	return ida_simple_get(&rndis_ida, 0, 0, GFP_KERNEL);
  }
  
  static inline void rndis_put_nr(int nr)
  {
  	ida_simple_remove(&rndis_ida, nr);
  }
  
  struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v)
  {
  	struct rndis_params *params;
  	int i;
  
  	if (!resp_avail)
  		return ERR_PTR(-EINVAL);
  
  	i = rndis_get_nr();
  	if (i < 0) {
  		pr_debug("failed\n");
  
  		return ERR_PTR(-ENODEV);
  	}
  
  	params = kzalloc(sizeof(*params), GFP_KERNEL);
  	if (!params) {
  		rndis_put_nr(i);
  
  		return ERR_PTR(-ENOMEM);
  	}
  
  #ifdef	CONFIG_USB_GADGET_DEBUG_FILES
  	{
  		struct proc_dir_entry *proc_entry;
  		char name[20];
  
  		sprintf(name, NAME_TEMPLATE, i);
  		proc_entry = proc_create_data(name, 0660, NULL,
  					      &rndis_proc_fops, params);
  		if (!proc_entry) {
  			kfree(params);
  			rndis_put_nr(i);
  
  			return ERR_PTR(-EIO);
  		}
  	}
  #endif
  
  	params->confignr = i;
  	params->used = 1;
  	params->state = RNDIS_UNINITIALIZED;
  	params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
  	params->resp_avail = resp_avail;
  	params->v = v;
  	INIT_LIST_HEAD(&params->resp_queue);
  	pr_debug("%s: configNr = %d\n", __func__, i);
  
  	return params;
  }
  EXPORT_SYMBOL_GPL(rndis_register);
  
  void rndis_deregister(struct rndis_params *params)
  {
  	int i;
  
  	pr_debug("%s:\n", __func__);
  
  	if (!params)
  		return;
  
  	i = params->confignr;
  
  #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  	{
  		char name[20];
  
  		sprintf(name, NAME_TEMPLATE, i);
  		remove_proc_entry(name, NULL);
  	}
  #endif
  
  	kfree(params);
  	rndis_put_nr(i);
  }
  EXPORT_SYMBOL_GPL(rndis_deregister);
  int rndis_set_param_dev(struct rndis_params *params, struct net_device *dev,
  			u16 *cdc_filter)
  {
  	pr_debug("%s:\n", __func__);
  	if (!dev)
  		return -EINVAL;
  	if (!params)
  		return -1;
  
  	params->dev = dev;
  	params->filter = cdc_filter;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(rndis_set_param_dev);
  
  int rndis_set_param_vendor(struct rndis_params *params, u32 vendorID,
  			   const char *vendorDescr)
  {
  	pr_debug("%s:\n", __func__);
  	if (!vendorDescr) return -1;
  	if (!params)
  		return -1;
  
  	params->vendorID = vendorID;
  	params->vendorDescr = vendorDescr;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(rndis_set_param_vendor);
  
  int rndis_set_param_medium(struct rndis_params *params, u32 medium, u32 speed)
  {
  	pr_debug("%s: %u %u\n", __func__, medium, speed);
  	if (!params)
  		return -1;
  
  	params->medium = medium;
  	params->speed = speed;
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(rndis_set_param_medium);
  
  void rndis_add_hdr(struct sk_buff *skb)
  {
  	struct rndis_packet_msg_type *header;
  
  	if (!skb)
  		return;
  	header = skb_push(skb, sizeof(*header));
  	memset(header, 0, sizeof *header);
  	header->MessageType = cpu_to_le32(RNDIS_MSG_PACKET);
  	header->MessageLength = cpu_to_le32(skb->len);
  	header->DataOffset = cpu_to_le32(36);
  	header->DataLength = cpu_to_le32(skb->len - sizeof(*header));
  }
  EXPORT_SYMBOL_GPL(rndis_add_hdr);
  
  void rndis_free_response(struct rndis_params *params, u8 *buf)
  {
  	rndis_resp_t *r, *n;
  
  	list_for_each_entry_safe(r, n, &params->resp_queue, list) {
  		if (r->buf == buf) {
  			list_del(&r->list);
  			kfree(r);
  		}
  	}
  }
  EXPORT_SYMBOL_GPL(rndis_free_response);
  
  u8 *rndis_get_next_response(struct rndis_params *params, u32 *length)
  {
  	rndis_resp_t *r, *n;
  
  	if (!length) return NULL;
  
  	list_for_each_entry_safe(r, n, &params->resp_queue, list) {
  		if (!r->send) {
  			r->send = 1;
  			*length = r->length;
  			return r->buf;
  		}
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL_GPL(rndis_get_next_response);
  
  static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length)
  {
  	rndis_resp_t *r;
  
  	/* NOTE: this gets copied into ether.c USB_BUFSIZ bytes ... */
  	r = kmalloc(sizeof(rndis_resp_t) + length, GFP_ATOMIC);
  	if (!r) return NULL;
  
  	r->buf = (u8 *)(r + 1);
  	r->length = length;
  	r->send = 0;
  
  	list_add_tail(&r->list, &params->resp_queue);
  	return r;
  }
  
  int rndis_rm_hdr(struct gether *port,
  			struct sk_buff *skb,
  			struct sk_buff_head *list)
  {
  	/* tmp points to a struct rndis_packet_msg_type */
  	__le32 *tmp = (void *)skb->data;
  
  	/* MessageType, MessageLength */
  	if (cpu_to_le32(RNDIS_MSG_PACKET)
  			!= get_unaligned(tmp++)) {
  		dev_kfree_skb_any(skb);
  		return -EINVAL;
  	}
  	tmp++;
  
  	/* DataOffset, DataLength */
  	if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
  		dev_kfree_skb_any(skb);
  		return -EOVERFLOW;
  	}
  	skb_trim(skb, get_unaligned_le32(tmp++));
  
  	skb_queue_tail(list, skb);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(rndis_rm_hdr);
  
  #ifdef CONFIG_USB_GADGET_DEBUG_FILES
  
  static int rndis_proc_show(struct seq_file *m, void *v)
  {
  	rndis_params *param = m->private;
  
  	seq_printf(m,
  			 "Config Nr. %d\n"
  			 "used      : %s\n"
  			 "state     : %s\n"
  			 "medium    : 0x%08X\n"
  			 "speed     : %d\n"
  			 "cable     : %s\n"
  			 "vendor ID : 0x%08X\n"
  			 "vendor    : %s\n",
  			 param->confignr, (param->used) ? "y" : "n",
  			 ({ char *s = "?";
  			 switch (param->state) {
  			 case RNDIS_UNINITIALIZED:
  				s = "RNDIS_UNINITIALIZED"; break;
  			 case RNDIS_INITIALIZED:
  				s = "RNDIS_INITIALIZED"; break;
  			 case RNDIS_DATA_INITIALIZED:
  				s = "RNDIS_DATA_INITIALIZED"; break;
  			} s; }),
  			 param->medium,
  			 (param->media_state) ? 0 : param->speed*100,
  			 (param->media_state) ? "disconnected" : "connected",
  			 param->vendorID, param->vendorDescr);
  	return 0;
  }
  
  static ssize_t rndis_proc_write(struct file *file, const char __user *buffer,
  				size_t count, loff_t *ppos)
  {
  	rndis_params *p = PDE_DATA(file_inode(file));
  	u32 speed = 0;
  	int i, fl_speed = 0;
  
  	for (i = 0; i < count; i++) {
  		char c;
  		if (get_user(c, buffer))
  			return -EFAULT;
  		switch (c) {
  		case '0':
  		case '1':
  		case '2':
  		case '3':
  		case '4':
  		case '5':
  		case '6':
  		case '7':
  		case '8':
  		case '9':
  			fl_speed = 1;
  			speed = speed * 10 + c - '0';
  			break;
  		case 'C':
  		case 'c':
  			rndis_signal_connect(p);
  			break;
  		case 'D':
  		case 'd':
  			rndis_signal_disconnect(p);
  			break;
  		default:
  			if (fl_speed) p->speed = speed;
  			else pr_debug("%c is not valid\n", c);
  			break;
  		}
  
  		buffer++;
  	}
  
  	return count;
  }
  
  static int rndis_proc_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, rndis_proc_show, PDE_DATA(inode));
  }
  
  static const struct file_operations rndis_proc_fops = {
  	.owner		= THIS_MODULE,
  	.open		= rndis_proc_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  	.write		= rndis_proc_write,
  };
  
  #define	NAME_TEMPLATE "driver/rndis-%03d"
  
  #endif /* CONFIG_USB_GADGET_DEBUG_FILES */
  