drivers/usb/gadget/rndis.c

/*
 * 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 <common.h>
#include <net.h>
#include <malloc.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/netdevice.h>

#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <asm/errno.h>

#undef	RNDIS_PM
#undef	RNDIS_WAKEUP
#undef	VERBOSE

#include "rndis.h"

#define ETH_ALEN	6		/* Octets in one ethernet addr	 */
#define ETH_HLEN	14		/* Total octets in header.	 */
#define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
#define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
#define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
#define ENOTSUPP        524     /* Operation is not supported */


/*
 * 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.
 */

#define RNDIS_MAX_CONFIGS	1

static rndis_params rndis_per_dev_params[RNDIS_MAX_CONFIGS];

/* Driver Version */
static const __le32 rndis_driver_version = __constant_cpu_to_le32(1);

/* Function Prototypes */
static rndis_resp_t *rndis_add_response(int configNr, u32 length);


/* supported OIDs */
static const u32 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,
#if 0
	OID_GEN_RNDIS_CONFIG_PARAMETER,
#endif

	/* the statistical stuff */
	OID_GEN_XMIT_OK,
	OID_GEN_RCV_OK,
	OID_GEN_XMIT_ERROR,
	OID_GEN_RCV_ERROR,
	OID_GEN_RCV_NO_BUFFER,
#ifdef	RNDIS_OPTIONAL_STATS
	OID_GEN_DIRECTED_BYTES_XMIT,
	OID_GEN_DIRECTED_FRAMES_XMIT,
	OID_GEN_MULTICAST_BYTES_XMIT,
	OID_GEN_MULTICAST_FRAMES_XMIT,
	OID_GEN_BROADCAST_BYTES_XMIT,
	OID_GEN_BROADCAST_FRAMES_XMIT,
	OID_GEN_DIRECTED_BYTES_RCV,
	OID_GEN_DIRECTED_FRAMES_RCV,
	OID_GEN_MULTICAST_BYTES_RCV,
	OID_GEN_MULTICAST_FRAMES_RCV,
	OID_GEN_BROADCAST_BYTES_RCV,
	OID_GEN_BROADCAST_FRAMES_RCV,
	OID_GEN_RCV_CRC_ERROR,
	OID_GEN_TRANSMIT_QUEUE_LENGTH,
#endif	/* RNDIS_OPTIONAL_STATS */

	/* mandatory 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,
#ifdef	RNDIS_OPTIONAL_STATS
	OID_802_3_XMIT_DEFERRED,
	OID_802_3_XMIT_MAX_COLLISIONS,
	OID_802_3_RCV_OVERRUN,
	OID_802_3_XMIT_UNDERRUN,
	OID_802_3_XMIT_HEARTBEAT_FAILURE,
	OID_802_3_XMIT_TIMES_CRS_LOST,
	OID_802_3_XMIT_LATE_COLLISIONS,
#endif	/* RNDIS_OPTIONAL_STATS */

#ifdef	RNDIS_PM
	/* PM and wakeup are mandatory for USB: */

	/* 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(int configNr, 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;
	rndis_params			*params;

	if (!r)
		return -ENOMEM;
	resp = (rndis_query_cmplt_type *) r->buf;

	if (!resp)
		return -ENOMEM;

#if defined(DEBUG) && defined(DEBUG_VERBOSE)
	if (buf_len) {
		debug("query OID %08x value, len %d:\n", OID, buf_len);
		for (i = 0; i < buf_len; i += 16) {
			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]));
		}
	}
#endif

	/* response goes here, right after the header */
	outbuf = (__le32 *) &resp[1];
	resp->InformationBufferOffset = __constant_cpu_to_le32(16);

	params = &rndis_per_dev_params[configNr];
	switch (OID) {

	/* general oids (table 4-1) */

	/* mandatory */
	case OID_GEN_SUPPORTED_LIST:
		debug("%s: 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 OID_GEN_HARDWARE_STATUS:
		debug("%s: 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 = __constant_cpu_to_le32(0);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_MEDIA_SUPPORTED:
		debug("%s: OID_GEN_MEDIA_SUPPORTED\n", __func__);
		*outbuf = cpu_to_le32(params->medium);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_MEDIA_IN_USE:
		debug("%s: 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 OID_GEN_MAXIMUM_FRAME_SIZE:
		debug("%s: OID_GEN_MAXIMUM_FRAME_SIZE\n", __func__);
		if (params->dev) {
			*outbuf = cpu_to_le32(params->mtu);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_LINK_SPEED:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_LINK_SPEED\n", __func__);
#endif
		if (params->media_state == NDIS_MEDIA_STATE_DISCONNECTED)
			*outbuf = __constant_cpu_to_le32(0);
		else
			*outbuf = cpu_to_le32(params->speed);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_TRANSMIT_BLOCK_SIZE:
		debug("%s: OID_GEN_TRANSMIT_BLOCK_SIZE\n", __func__);
		if (params->dev) {
			*outbuf = cpu_to_le32(params->mtu);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_RECEIVE_BLOCK_SIZE:
		debug("%s: OID_GEN_RECEIVE_BLOCK_SIZE\n", __func__);
		if (params->dev) {
			*outbuf = cpu_to_le32(params->mtu);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_VENDOR_ID:
		debug("%s: OID_GEN_VENDOR_ID\n", __func__);
		*outbuf = cpu_to_le32(params->vendorID);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_VENDOR_DESCRIPTION:
		debug("%s: OID_GEN_VENDOR_DESCRIPTION\n", __func__);
		length = strlen(params->vendorDescr);
		memcpy(outbuf, params->vendorDescr, length);
		retval = 0;
		break;

	case OID_GEN_VENDOR_DRIVER_VERSION:
		debug("%s: OID_GEN_VENDOR_DRIVER_VERSION\n", __func__);
		/* Created as LE */
		*outbuf = rndis_driver_version;
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_CURRENT_PACKET_FILTER:
		debug("%s: OID_GEN_CURRENT_PACKET_FILTER\n", __func__);
		*outbuf = cpu_to_le32(*params->filter);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_MAXIMUM_TOTAL_SIZE:
		debug("%s: OID_GEN_MAXIMUM_TOTAL_SIZE\n", __func__);
		*outbuf = __constant_cpu_to_le32(RNDIS_MAX_TOTAL_SIZE);
		retval = 0;
		break;

	/* mandatory */
	case OID_GEN_MEDIA_CONNECT_STATUS:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_MEDIA_CONNECT_STATUS\n", __func__);
#endif
		*outbuf = cpu_to_le32(params->media_state);
		retval = 0;
		break;

	case OID_GEN_PHYSICAL_MEDIUM:
		debug("%s: OID_GEN_PHYSICAL_MEDIUM\n", __func__);
		*outbuf = __constant_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 OID_GEN_MAC_OPTIONS:		/* from WinME */
		debug("%s: OID_GEN_MAC_OPTIONS\n", __func__);
		*outbuf = __constant_cpu_to_le32(
				  NDIS_MAC_OPTION_RECEIVE_SERIALIZED
				| NDIS_MAC_OPTION_FULL_DUPLEX);
		retval = 0;
		break;

	/* statistics OIDs (table 4-2) */

	/* mandatory */
	case OID_GEN_XMIT_OK:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_XMIT_OK\n", __func__);
#endif
		if (params->stats) {
			*outbuf = cpu_to_le32(
					params->stats->tx_packets -
					params->stats->tx_errors -
					params->stats->tx_dropped);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_RCV_OK:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_RCV_OK\n", __func__);
#endif
		if (params->stats) {
			*outbuf = cpu_to_le32(
					params->stats->rx_packets -
					params->stats->rx_errors -
					params->stats->rx_dropped);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_XMIT_ERROR:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_XMIT_ERROR\n", __func__);
#endif
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->tx_errors);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_RCV_ERROR:
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: OID_GEN_RCV_ERROR\n", __func__);
#endif
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_errors);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_GEN_RCV_NO_BUFFER:
		debug("%s: OID_GEN_RCV_NO_BUFFER\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_dropped);
			retval = 0;
		}
		break;

#ifdef	RNDIS_OPTIONAL_STATS
	case OID_GEN_DIRECTED_BYTES_XMIT:
		debug("%s: OID_GEN_DIRECTED_BYTES_XMIT\n", __func__);
		/*
		 * Aunt Tilly's size of shoes
		 * minus antarctica count of penguins
		 * divided by weight of Alpha Centauri
		 */
		if (params->stats) {
			*outbuf = cpu_to_le32(
					(params->stats->tx_packets -
					 params->stats->tx_errors -
					 params->stats->tx_dropped)
					* 123);
			retval = 0;
		}
		break;

	case OID_GEN_DIRECTED_FRAMES_XMIT:
		debug("%s: OID_GEN_DIRECTED_FRAMES_XMIT\n", __func__);
		/* dito */
		if (params->stats) {
			*outbuf = cpu_to_le32(
					(params->stats->tx_packets -
					 params->stats->tx_errors -
					 params->stats->tx_dropped)
					/ 123);
			retval = 0;
		}
		break;

	case OID_GEN_MULTICAST_BYTES_XMIT:
		debug("%s: OID_GEN_MULTICAST_BYTES_XMIT\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->multicast * 1234);
			retval = 0;
		}
		break;

	case OID_GEN_MULTICAST_FRAMES_XMIT:
		debug("%s: OID_GEN_MULTICAST_FRAMES_XMIT\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->multicast);
			retval = 0;
		}
		break;

	case OID_GEN_BROADCAST_BYTES_XMIT:
		debug("%s: OID_GEN_BROADCAST_BYTES_XMIT\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->tx_packets/42*255);
			retval = 0;
		}
		break;

	case OID_GEN_BROADCAST_FRAMES_XMIT:
		debug("%s: OID_GEN_BROADCAST_FRAMES_XMIT\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->tx_packets / 42);
			retval = 0;
		}
		break;

	case OID_GEN_DIRECTED_BYTES_RCV:
		debug("%s: OID_GEN_DIRECTED_BYTES_RCV\n", __func__);
		*outbuf = __constant_cpu_to_le32(0);
		retval = 0;
		break;

	case OID_GEN_DIRECTED_FRAMES_RCV:
		debug("%s: OID_GEN_DIRECTED_FRAMES_RCV\n", __func__);
		*outbuf = __constant_cpu_to_le32(0);
		retval = 0;
		break;

	case OID_GEN_MULTICAST_BYTES_RCV:
		debug("%s: OID_GEN_MULTICAST_BYTES_RCV\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->multicast * 1111);
			retval = 0;
		}
		break;

	case OID_GEN_MULTICAST_FRAMES_RCV:
		debug("%s: OID_GEN_MULTICAST_FRAMES_RCV\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->multicast);
			retval = 0;
		}
		break;

	case OID_GEN_BROADCAST_BYTES_RCV:
		debug("%s: OID_GEN_BROADCAST_BYTES_RCV\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_packets/42*255);
			retval = 0;
		}
		break;

	case OID_GEN_BROADCAST_FRAMES_RCV:
		debug("%s: OID_GEN_BROADCAST_FRAMES_RCV\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_packets / 42);
			retval = 0;
		}
		break;

	case OID_GEN_RCV_CRC_ERROR:
		debug("%s: OID_GEN_RCV_CRC_ERROR\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_crc_errors);
			retval = 0;
		}
		break;

	case OID_GEN_TRANSMIT_QUEUE_LENGTH:
		debug("%s: OID_GEN_TRANSMIT_QUEUE_LENGTH\n", __func__);
		*outbuf = __constant_cpu_to_le32(0);
		retval = 0;
		break;
#endif	/* RNDIS_OPTIONAL_STATS */

	/* ieee802.3 OIDs (table 4-3) */

	/* mandatory */
	case OID_802_3_PERMANENT_ADDRESS:
		debug("%s: OID_802_3_PERMANENT_ADDRESS\n", __func__);
		if (params->dev) {
			length = ETH_ALEN;
			memcpy(outbuf, params->host_mac, length);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_802_3_CURRENT_ADDRESS:
		debug("%s: OID_802_3_CURRENT_ADDRESS\n", __func__);
		if (params->dev) {
			length = ETH_ALEN;
			memcpy(outbuf, params->host_mac, length);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_802_3_MULTICAST_LIST:
		debug("%s: OID_802_3_MULTICAST_LIST\n", __func__);
		/* Multicast base address only */
		*outbuf = __constant_cpu_to_le32(0xE0000000);
		retval = 0;
		break;

	/* mandatory */
	case OID_802_3_MAXIMUM_LIST_SIZE:
		debug("%s: OID_802_3_MAXIMUM_LIST_SIZE\n", __func__);
		/* Multicast base address only */
		*outbuf = __constant_cpu_to_le32(1);
		retval = 0;
		break;

	case OID_802_3_MAC_OPTIONS:
		debug("%s: OID_802_3_MAC_OPTIONS\n", __func__);
		break;

	/* ieee802.3 statistics OIDs (table 4-4) */

	/* mandatory */
	case OID_802_3_RCV_ERROR_ALIGNMENT:
		debug("%s: OID_802_3_RCV_ERROR_ALIGNMENT\n", __func__);
		if (params->stats) {
			*outbuf = cpu_to_le32(params->stats->rx_frame_errors);
			retval = 0;
		}
		break;

	/* mandatory */
	case OID_802_3_XMIT_ONE_COLLISION:
		debug("%s: OID_802_3_XMIT_ONE_COLLISION\n", __func__);
		*outbuf = __constant_cpu_to_le32(0);
		retval = 0;
		break;

	/* mandatory */
	case OID_802_3_XMIT_MORE_COLLISIONS:
		debug("%s: OID_802_3_XMIT_MORE_COLLISIONS\n", __func__);
		*outbuf = __constant_cpu_to_le32(0);
		retval = 0;
		break;

#ifdef	RNDIS_OPTIONAL_STATS
	case OID_802_3_XMIT_DEFERRED:
		debug("%s: OID_802_3_XMIT_DEFERRED\n", __func__);
		/* TODO */
		break;

	case OID_802_3_XMIT_MAX_COLLISIONS:
		debug("%s: OID_802_3_XMIT_MAX_COLLISIONS\n", __func__);
		/* TODO */
		break;

	case OID_802_3_RCV_OVERRUN:
		debug("%s: OID_802_3_RCV_OVERRUN\n", __func__);
		/* TODO */
		break;

	case OID_802_3_XMIT_UNDERRUN:
		debug("%s: OID_802_3_XMIT_UNDERRUN\n", __func__);
		/* TODO */
		break;

	case OID_802_3_XMIT_HEARTBEAT_FAILURE:
		debug("%s: OID_802_3_XMIT_HEARTBEAT_FAILURE\n", __func__);
		/* TODO */
		break;

	case OID_802_3_XMIT_TIMES_CRS_LOST:
		debug("%s: OID_802_3_XMIT_TIMES_CRS_LOST\n", __func__);
		/* TODO */
		break;

	case OID_802_3_XMIT_LATE_COLLISIONS:
		debug("%s: OID_802_3_XMIT_LATE_COLLISIONS\n", __func__);
		/* TODO */
		break;
#endif	/* RNDIS_OPTIONAL_STATS */

#ifdef	RNDIS_PM
	/* power management OIDs (table 4-5) */
	case OID_PNP_CAPABILITIES:
		debug("%s: OID_PNP_CAPABILITIES\n", __func__);

		/* for now, no wakeup capabilities */
		length = sizeof(struct NDIS_PNP_CAPABILITIES);
		memset(outbuf, 0, length);
		retval = 0;
		break;
	case OID_PNP_QUERY_POWER:
		debug("%s: OID_PNP_QUERY_POWER D%d\n", __func__,
				get_unaligned_le32(buf) - 1);
		/*
		 * only suspend is a real power state, and
		 * it can't be entered by OID_PNP_SET_POWER...
		 */
		length = 0;
		retval = 0;
		break;
#endif

	default:
		debug("%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(u8 configNr, u32 OID, u8 *buf, u32 buf_len,
				rndis_resp_t *r)
{
	rndis_set_cmplt_type		*resp;
	int				retval = -ENOTSUPP;
	struct rndis_params		*params;
#if (defined(DEBUG) && defined(DEBUG_VERBOSE)) || defined(RNDIS_PM)
	int				i;
#endif

	if (!r)
		return -ENOMEM;
	resp = (rndis_set_cmplt_type *) r->buf;
	if (!resp)
		return -ENOMEM;

#if defined(DEBUG) && defined(DEBUG_VERBOSE)
	if (buf_len) {
		debug("set OID %08x value, len %d:\n", OID, buf_len);
		for (i = 0; i < buf_len; i += 16) {
			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]));
		}
	}
#endif

	params = &rndis_per_dev_params[configNr];
	switch (OID) {
	case 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);
		debug("%s: 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.
		 */
#ifdef	RNDIS_PM
update_linkstate:
#endif
		retval = 0;
		if (*params->filter)
			params->state = RNDIS_DATA_INITIALIZED;
		else
			params->state = RNDIS_INITIALIZED;
		break;

	case OID_802_3_MULTICAST_LIST:
		/* I think we can ignore this */
		debug("%s: OID_802_3_MULTICAST_LIST\n", __func__);
		retval = 0;
		break;
#if 0
	case OID_GEN_RNDIS_CONFIG_PARAMETER:
		{
		struct rndis_config_parameter	*param;
		param = (struct rndis_config_parameter *) buf;
		debug("%s: OID_GEN_RNDIS_CONFIG_PARAMETER '%*s'\n",
			__func__,
			min(cpu_to_le32(param->ParameterNameLength), 80),
			buf + param->ParameterNameOffset);
		retval = 0;
		}
		break;
#endif

#ifdef	RNDIS_PM
	case OID_PNP_SET_POWER:
		/*
		 * The only real power state is USB suspend, and RNDIS requests
		 * can't enter it; this one isn't really about power.  After
		 * resuming, Windows forces a reset, and then SET_POWER D0.
		 * FIXME ... then things go batty; Windows wedges itself.
		 */
		i = get_unaligned_le32(buf);
		debug("%s: OID_PNP_SET_POWER D%d\n", __func__, i - 1);
		switch (i) {
		case NdisDeviceStateD0:
			*params->filter = params->saved_filter;
			goto update_linkstate;
		case NdisDeviceStateD3:
		case NdisDeviceStateD2:
		case NdisDeviceStateD1:
			params->saved_filter = *params->filter;
			retval = 0;
			break;
		}
		break;

#ifdef	RNDIS_WAKEUP
	/*
	 * no wakeup support advertised, so wakeup OIDs always fail:
	 *  - OID_PNP_ENABLE_WAKE_UP
	 *  - OID_PNP_{ADD,REMOVE}_WAKE_UP_PATTERN
	 */
#endif

#endif	/* RNDIS_PM */

	default:
		debug("%s: set unknown OID 0x%08X, size %d\n",
			__func__, OID, buf_len);
	}

	return retval;
}

/*
 * Response Functions
 */

static int rndis_init_response(int configNr, rndis_init_msg_type *buf)
{
	rndis_init_cmplt_type	*resp;
	rndis_resp_t            *r;

	if (!rndis_per_dev_params[configNr].dev)
		return -ENOTSUPP;

	r = rndis_add_response(configNr, sizeof(rndis_init_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_init_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32(
			REMOTE_NDIS_INITIALIZE_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32(52);
	resp->RequestID = get_unaligned(&buf->RequestID); /* Still LE in msg buffer */
	resp->Status = __constant_cpu_to_le32(RNDIS_STATUS_SUCCESS);
	resp->MajorVersion = __constant_cpu_to_le32(RNDIS_MAJOR_VERSION);
	resp->MinorVersion = __constant_cpu_to_le32(RNDIS_MINOR_VERSION);
	resp->DeviceFlags = __constant_cpu_to_le32(RNDIS_DF_CONNECTIONLESS);
	resp->Medium = __constant_cpu_to_le32(RNDIS_MEDIUM_802_3);
	resp->MaxPacketsPerTransfer = __constant_cpu_to_le32(1);
	resp->MaxTransferSize = cpu_to_le32(
		  rndis_per_dev_params[configNr].mtu
		+ ETHER_HDR_SIZE
		+ sizeof(struct rndis_packet_msg_type)
		+ 22);
	resp->PacketAlignmentFactor = __constant_cpu_to_le32(0);
	resp->AFListOffset = __constant_cpu_to_le32(0);
	resp->AFListSize = __constant_cpu_to_le32(0);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);

	return 0;
}

static int rndis_query_response(int configNr, rndis_query_msg_type *buf)
{
	rndis_query_cmplt_type *resp;
	rndis_resp_t            *r;

	debug("%s: OID = %08X\n", __func__, get_unaligned_le32(&buf->OID));
	if (!rndis_per_dev_params[configNr].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(configNr,
		sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_query_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32(REMOTE_NDIS_QUERY_CMPLT);
	resp->RequestID = get_unaligned(&buf->RequestID); /* Still LE in msg buffer */

	if (gen_ndis_query_resp(configNr, get_unaligned_le32(&buf->OID),
			get_unaligned_le32(&buf->InformationBufferOffset)
					+ 8 + (u8 *) buf,
			get_unaligned_le32(&buf->InformationBufferLength),
			r)) {
		/* OID not supported */
		resp->Status = __constant_cpu_to_le32(
						RNDIS_STATUS_NOT_SUPPORTED);
		resp->MessageLength = __constant_cpu_to_le32(sizeof *resp);
		resp->InformationBufferLength = __constant_cpu_to_le32(0);
		resp->InformationBufferOffset = __constant_cpu_to_le32(0);
	} else
		resp->Status = __constant_cpu_to_le32(RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);
	return 0;
}

static int rndis_set_response(int configNr, rndis_set_msg_type *buf)
{
	u32			BufLength, BufOffset;
	rndis_set_cmplt_type	*resp;
	rndis_resp_t		*r;

	r = rndis_add_response(configNr, sizeof(rndis_set_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_set_cmplt_type *) r->buf;

	BufLength = get_unaligned_le32(&buf->InformationBufferLength);
	BufOffset = get_unaligned_le32(&buf->InformationBufferOffset);

#ifdef	VERBOSE
	debug("%s: Length: %d\n", __func__, BufLength);
	debug("%s: Offset: %d\n", __func__, BufOffset);
	debug("%s: InfoBuffer: ", __func__);

	for (i = 0; i < BufLength; i++)
		debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset));

	debug("\n");
#endif

	resp->MessageType = __constant_cpu_to_le32(REMOTE_NDIS_SET_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32(16);
	resp->RequestID = get_unaligned(&buf->RequestID); /* Still LE in msg buffer */
	if (gen_ndis_set_resp(configNr, get_unaligned_le32(&buf->OID),
			((u8 *) buf) + 8 + BufOffset, BufLength, r))
		resp->Status = __constant_cpu_to_le32(
						RNDIS_STATUS_NOT_SUPPORTED);
	else
		resp->Status = __constant_cpu_to_le32(RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);

	return 0;
}

static int rndis_reset_response(int configNr, rndis_reset_msg_type *buf)
{
	rndis_reset_cmplt_type	*resp;
	rndis_resp_t		*r;

	r = rndis_add_response(configNr, sizeof(rndis_reset_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_reset_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32(REMOTE_NDIS_RESET_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32(16);
	resp->Status = __constant_cpu_to_le32(RNDIS_STATUS_SUCCESS);
	/* resent information */
	resp->AddressingReset = __constant_cpu_to_le32(1);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);

	return 0;
}

static int rndis_keepalive_response(int configNr,
					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(configNr, sizeof(rndis_keepalive_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_keepalive_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32(
			REMOTE_NDIS_KEEPALIVE_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32(16);
	resp->RequestID = get_unaligned(&buf->RequestID); /* Still LE in msg buffer */
	resp->Status = __constant_cpu_to_le32(RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);

	return 0;
}


/*
 * Device to Host Comunication
 */
static int rndis_indicate_status_msg(int configNr, u32 status)
{
	rndis_indicate_status_msg_type	*resp;
	rndis_resp_t			*r;

	if (rndis_per_dev_params[configNr].state == RNDIS_UNINITIALIZED)
		return -ENOTSUPP;

	r = rndis_add_response(configNr,
				sizeof(rndis_indicate_status_msg_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_indicate_status_msg_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32(
			REMOTE_NDIS_INDICATE_STATUS_MSG);
	resp->MessageLength = __constant_cpu_to_le32(20);
	resp->Status = cpu_to_le32(status);
	resp->StatusBufferLength = __constant_cpu_to_le32(0);
	resp->StatusBufferOffset = __constant_cpu_to_le32(0);

	if (rndis_per_dev_params[configNr].ack)
		rndis_per_dev_params[configNr].ack(
			rndis_per_dev_params[configNr].dev);
	return 0;
}

int rndis_signal_connect(int configNr)
{
	rndis_per_dev_params[configNr].media_state
			= NDIS_MEDIA_STATE_CONNECTED;
	return rndis_indicate_status_msg(configNr,
					  RNDIS_STATUS_MEDIA_CONNECT);
}

int rndis_signal_disconnect(int configNr)
{
	rndis_per_dev_params[configNr].media_state
			= NDIS_MEDIA_STATE_DISCONNECTED;

#ifdef RNDIS_COMPLETE_SIGNAL_DISCONNECT
	return rndis_indicate_status_msg(configNr,
					  RNDIS_STATUS_MEDIA_DISCONNECT);
#else
	return 0;
#endif
}

void rndis_uninit(int configNr)
{
	u8 *buf;
	u32 length;

	if (configNr >= RNDIS_MAX_CONFIGS)
		return;
	rndis_per_dev_params[configNr].used = 0;
	rndis_per_dev_params[configNr].state = RNDIS_UNINITIALIZED;

	/* drain the response queue */
	while ((buf = rndis_get_next_response(configNr, &length)))
		rndis_free_response(configNr, buf);
}

void rndis_set_host_mac(int configNr, const u8 *addr)
{
	rndis_per_dev_params[configNr].host_mac = addr;
}

enum rndis_state rndis_get_state(int configNr)
{
	if (configNr >= RNDIS_MAX_CONFIGS || configNr < 0)
		return -ENOTSUPP;
	return rndis_per_dev_params[configNr].state;
}

/*
 * Message Parser
 */
int rndis_msg_parser(u8 configNr, u8 *buf)
{
	u32				MsgType, MsgLength;
	__le32				*tmp;
	struct rndis_params		*params;

	debug("%s: configNr = %d, %p\n", __func__, configNr, buf);

	if (!buf)
		return -ENOMEM;

	tmp = (__le32 *) buf;
	MsgType   = get_unaligned_le32(tmp++);
	MsgLength = get_unaligned_le32(tmp++);

	if (configNr >= RNDIS_MAX_CONFIGS)
		return -ENOTSUPP;
	params = &rndis_per_dev_params[configNr];

	/*
	 * 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 REMOTE_NDIS_INITIALIZE_MSG:
		debug("%s: REMOTE_NDIS_INITIALIZE_MSG\n", __func__);
		params->state = RNDIS_INITIALIZED;
		return  rndis_init_response(configNr,
					(rndis_init_msg_type *) buf);

	case REMOTE_NDIS_HALT_MSG:
		debug("%s: REMOTE_NDIS_HALT_MSG\n", __func__);
		params->state = RNDIS_UNINITIALIZED;
		return 0;

	case REMOTE_NDIS_QUERY_MSG:
		return rndis_query_response(configNr,
					(rndis_query_msg_type *) buf);

	case REMOTE_NDIS_SET_MSG:
		return rndis_set_response(configNr,
					(rndis_set_msg_type *) buf);

	case REMOTE_NDIS_RESET_MSG:
		debug("%s: REMOTE_NDIS_RESET_MSG\n", __func__);
		return rndis_reset_response(configNr,
					(rndis_reset_msg_type *) buf);

	case REMOTE_NDIS_KEEPALIVE_MSG:
		/* For USB: host does this every 5 seconds */
#if defined(DEBUG) && defined(DEBUG_VERBOSE)
		debug("%s: REMOTE_NDIS_KEEPALIVE_MSG\n", __func__);
#endif
		return rndis_keepalive_response(configNr,
					(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.
		 */
		debug("%s: unknown RNDIS message 0x%08X len %d\n",
			__func__ , MsgType, MsgLength);
		{
			unsigned i;
			for (i = 0; i < MsgLength; i += 16) {
				debug("%03d: "
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					"\n",
					i,
					buf[i], buf[i+1],
						buf[i+2], buf[i+3],
					buf[i+4], buf[i+5],
						buf[i+6], buf[i+7],
					buf[i+8], buf[i+9],
						buf[i+10], buf[i+11],
					buf[i+12], buf[i+13],
						buf[i+14], buf[i+15]);
			}
		}
		break;
	}

	return -ENOTSUPP;
}

int rndis_register(int (*rndis_control_ack)(struct eth_device *))
{
	u8 i;

	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
		if (!rndis_per_dev_params[i].used) {
			rndis_per_dev_params[i].used = 1;
			rndis_per_dev_params[i].ack = rndis_control_ack;
			debug("%s: configNr = %d\n", __func__, i);
			return i;
		}
	}
	debug("%s failed\n", __func__);

	return -1;
}

void rndis_deregister(int configNr)
{
	debug("%s: configNr = %d\n", __func__, configNr);

	if (configNr >= RNDIS_MAX_CONFIGS)
		return;
	rndis_per_dev_params[configNr].used = 0;

	return;
}

int rndis_set_param_dev(u8 configNr, struct eth_device *dev, int mtu,
			struct net_device_stats *stats,	u16 *cdc_filter)
{
	debug("%s: configNr = %d\n", __func__, configNr);
	if (!dev || !stats)
		return -1;
	if (configNr >= RNDIS_MAX_CONFIGS)
		return -1;

	rndis_per_dev_params[configNr].dev = dev;
	rndis_per_dev_params[configNr].stats = stats;
	rndis_per_dev_params[configNr].mtu = mtu;
	rndis_per_dev_params[configNr].filter = cdc_filter;

	return 0;
}

int rndis_set_param_vendor(u8 configNr, u32 vendorID, const char *vendorDescr)
{
	debug("%s: configNr = %d\n", __func__, configNr);
	if (!vendorDescr)
		return -1;
	if (configNr >= RNDIS_MAX_CONFIGS)
		return -1;

	rndis_per_dev_params[configNr].vendorID = vendorID;
	rndis_per_dev_params[configNr].vendorDescr = vendorDescr;

	return 0;
}

int rndis_set_param_medium(u8 configNr, u32 medium, u32 speed)
{
	debug("%s: configNr = %d, %u %u\n", __func__, configNr, medium, speed);
	if (configNr >= RNDIS_MAX_CONFIGS)
		return -1;

	rndis_per_dev_params[configNr].medium = medium;
	rndis_per_dev_params[configNr].speed = speed;

	return 0;
}

void rndis_add_hdr(void *buf, int length)
{
	struct rndis_packet_msg_type	*header;

	header = buf;
	memset(header, 0, sizeof *header);
	header->MessageType = __constant_cpu_to_le32(REMOTE_NDIS_PACKET_MSG);
	header->MessageLength = cpu_to_le32(length + sizeof *header);
	header->DataOffset = __constant_cpu_to_le32(36);
	header->DataLength = cpu_to_le32(length);
}

void rndis_free_response(int configNr, u8 *buf)
{
	rndis_resp_t		*r;
	struct list_head	*act, *tmp;

	list_for_each_safe(act, tmp,
			&(rndis_per_dev_params[configNr].resp_queue))
	{
		r = list_entry(act, rndis_resp_t, list);
		if (r && r->buf == buf) {
			list_del(&r->list);
			free(r);
		}
	}
}

u8 *rndis_get_next_response(int configNr, u32 *length)
{
	rndis_resp_t		*r;
	struct list_head	*act, *tmp;

	if (!length)
		return NULL;

	list_for_each_safe(act, tmp,
			&(rndis_per_dev_params[configNr].resp_queue))
	{
		r = list_entry(act, rndis_resp_t, list);
		if (!r->send) {
			r->send = 1;
			*length = r->length;
			return r->buf;
		}
	}

	return NULL;
}

static rndis_resp_t *rndis_add_response(int configNr, u32 length)
{
	rndis_resp_t	*r;

	/* NOTE:  this gets copied into ether.c USB_BUFSIZ bytes ... */
	r = malloc(sizeof(rndis_resp_t) + length);
	if (!r)
		return NULL;

	r->buf = (u8 *) (r + 1);
	r->length = length;
	r->send = 0;

	list_add_tail(&r->list,
		&(rndis_per_dev_params[configNr].resp_queue));
	return r;
}

int rndis_rm_hdr(void *buf, int length)
{
	/* tmp points to a struct rndis_packet_msg_type */
	__le32		*tmp = buf;
	int		offs, len;

	/* MessageType, MessageLength */
	if (__constant_cpu_to_le32(REMOTE_NDIS_PACKET_MSG)
			!= get_unaligned(tmp++))
		return -EINVAL;
	tmp++;

	/* DataOffset, DataLength */
	offs = get_unaligned_le32(tmp++) + 8 /* offset of DataOffset */;
	if (offs != sizeof(struct rndis_packet_msg_type))
		debug("%s: unexpected DataOffset: %d\n", __func__, offs);
	if (offs >= length)
		return -EOVERFLOW;

	len = get_unaligned_le32(tmp++);
	if (len + sizeof(struct rndis_packet_msg_type) != length)
		debug("%s: unexpected DataLength: %d, packet length=%d\n",
				__func__, len, length);

	memmove(buf, buf + offs, len);

	return offs;
}

int rndis_init(void)
{
	u8 i;

	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
		rndis_per_dev_params[i].confignr = i;
		rndis_per_dev_params[i].used = 0;
		rndis_per_dev_params[i].state = RNDIS_UNINITIALIZED;
		rndis_per_dev_params[i].media_state
				= NDIS_MEDIA_STATE_DISCONNECTED;
		INIT_LIST_HEAD(&(rndis_per_dev_params[i].resp_queue));
	}

	return 0;
}

void rndis_exit(void)
{
	/* Nothing to do */
}