rndis_host.c

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/*
 * Host Side support for RNDIS Networking Links
 * Copyright (C) 2005 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/rndis_host.h>


/*
 * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
 * course ACM was intended for modems, not Ethernet links!  USB's standard
 * for Ethernet links is "CDC Ethernet", which is significantly simpler.
 *
 * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
 * include:
 *    - Power management in particular relies on information that's scattered
 *  through other documentation, and which is incomplete or incorrect even
 *  there.
 *    - There are various undocumented protocol requirements, such as the
 *  need to send unused garbage in control-OUT messages.
 *    - In some cases, MS-Windows will emit undocumented requests; this
 *  matters more to peripheral implementations than host ones.
 *
 * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
 *
 * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
 * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
 * currently rare) "Ethernet Emulation Model" (EEM).
 */

/*
 * RNDIS notifications from device: command completion; "reverse"
 * keepalives; etc
 */
void rndis_status(struct usbnet *dev, struct urb *urb)
{
    netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
           urb->actual_length, urb->status);
    // FIXME for keepalives, respond immediately (asynchronously)
    // if not an RNDIS status, do like cdc_status(dev,urb) does
}
EXPORT_SYMBOL_GPL(rndis_status);

/*
 * RNDIS indicate messages.
 */
static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
                int buflen)
{
    struct cdc_state *info = (void *)&dev->data;
    struct device *udev = &info->control->dev;

    if (dev->driver_info->indication) {
        dev->driver_info->indication(dev, msg, buflen);
    } else {
        u32 status = le32_to_cpu(msg->status);

        switch (status) {
        case RNDIS_STATUS_MEDIA_CONNECT:
            dev_info(udev, "rndis media connect\n");
            break;
        case RNDIS_STATUS_MEDIA_DISCONNECT:
            dev_info(udev, "rndis media disconnect\n");
            break;
        default:
            dev_info(udev, "rndis indication: 0x%08x\n", status);
        }
    }
}

/*
 * RPC done RNDIS-style.  Caller guarantees:
 * - message is properly byteswapped
 * - there's no other request pending
 * - buf can hold up to 1KB response (required by RNDIS spec)
 * On return, the first few entries are already byteswapped.
 *
 * Call context is likely probe(), before interface name is known,
 * which is why we won't try to use it in the diagnostics.
 */
int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
{
    struct cdc_state    *info = (void *) &dev->data;
    struct usb_cdc_notification notification;
    int         master_ifnum;
    int         retval;
    int         partial;
    unsigned        count;
    u32         xid = 0, msg_len, request_id, msg_type, rsp,
                status;

    /* REVISIT when this gets called from contexts other than probe() or
     * disconnect(): either serialize, or dispatch responses on xid
     */

    msg_type = le32_to_cpu(buf->msg_type);

    /* Issue the request; xid is unique, don't bother byteswapping it */
    if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
        xid = dev->xid++;
        if (!xid)
            xid = dev->xid++;
        buf->request_id = (__force __le32) xid;
    }
    master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
    retval = usb_control_msg(dev->udev,
        usb_sndctrlpipe(dev->udev, 0),
        USB_CDC_SEND_ENCAPSULATED_COMMAND,
        USB_TYPE_CLASS | USB_RECIP_INTERFACE,
        0, master_ifnum,
        buf, le32_to_cpu(buf->msg_len),
        RNDIS_CONTROL_TIMEOUT_MS);
    if (unlikely(retval < 0 || xid == 0))
        return retval;

    /* Some devices don't respond on the control channel until
     * polled on the status channel, so do that first. */
    if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
        retval = usb_interrupt_msg(
            dev->udev,
            usb_rcvintpipe(dev->udev,
                       dev->status->desc.bEndpointAddress),
            &notification, sizeof(notification), &partial,
            RNDIS_CONTROL_TIMEOUT_MS);
        if (unlikely(retval < 0))
            return retval;
    }

    /* Poll the control channel; the request probably completed immediately */
    rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
    for (count = 0; count < 10; count++) {
        memset(buf, 0, CONTROL_BUFFER_SIZE);
        retval = usb_control_msg(dev->udev,
            usb_rcvctrlpipe(dev->udev, 0),
            USB_CDC_GET_ENCAPSULATED_RESPONSE,
            USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
            0, master_ifnum,
            buf, buflen,
            RNDIS_CONTROL_TIMEOUT_MS);
        if (likely(retval >= 8)) {
            msg_type = le32_to_cpu(buf->msg_type);
            msg_len = le32_to_cpu(buf->msg_len);
            status = le32_to_cpu(buf->status);
            request_id = (__force u32) buf->request_id;
            if (likely(msg_type == rsp)) {
                if (likely(request_id == xid)) {
                    if (unlikely(rsp == RNDIS_MSG_RESET_C))
                        return 0;
                    if (likely(RNDIS_STATUS_SUCCESS ==
                            status))
                        return 0;
                    dev_dbg(&info->control->dev,
                        "rndis reply status %08x\n",
                        status);
                    return -EL3RST;
                }
                dev_dbg(&info->control->dev,
                    "rndis reply id %d expected %d\n",
                    request_id, xid);
                /* then likely retry */
            } else switch (msg_type) {
            case RNDIS_MSG_INDICATE: /* fault/event */
                rndis_msg_indicate(dev, (void *)buf, buflen);
                break;
            case RNDIS_MSG_KEEPALIVE: { /* ping */
                struct rndis_keepalive_c *msg = (void *)buf;

                msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
                msg->msg_len = cpu_to_le32(sizeof *msg);
                msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
                retval = usb_control_msg(dev->udev,
                    usb_sndctrlpipe(dev->udev, 0),
                    USB_CDC_SEND_ENCAPSULATED_COMMAND,
                    USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                    0, master_ifnum,
                    msg, sizeof *msg,
                    RNDIS_CONTROL_TIMEOUT_MS);
                if (unlikely(retval < 0))
                    dev_dbg(&info->control->dev,
                        "rndis keepalive err %d\n",
                        retval);
                }
                break;
            default:
                dev_dbg(&info->control->dev,
                    "unexpected rndis msg %08x len %d\n",
                    le32_to_cpu(buf->msg_type), msg_len);
            }
        } else {
            /* device probably issued a protocol stall; ignore */
            dev_dbg(&info->control->dev,
                "rndis response error, code %d\n", retval);
        }
        msleep(20);
    }
    dev_dbg(&info->control->dev, "rndis response timeout\n");
    return -ETIMEDOUT;
}
EXPORT_SYMBOL_GPL(rndis_command);

/*
 * rndis_query:
 *
 * Performs a query for @oid along with 0 or more bytes of payload as
 * specified by @in_len. If @reply_len is not set to -1 then the reply
 * length is checked against this value, resulting in an error if it
 * doesn't match.
 *
 * NOTE: Adding a payload exactly or greater than the size of the expected
 * response payload is an evident requirement MSFT added for ActiveSync.
 *
 * The only exception is for OIDs that return a variably sized response,
 * in which case no payload should be added.  This undocumented (and
 * nonsensical!) issue was found by sniffing protocol requests from the
 * ActiveSync 4.1 Windows driver.
 */
static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
        void *buf, u32 oid, u32 in_len,
        void **reply, int *reply_len)
{
    int retval;
    union {
        void            *buf;
        struct rndis_msg_hdr    *header;
        struct rndis_query  *get;
        struct rndis_query_c    *get_c;
    } u;
    u32 off, len;

    u.buf = buf;

    memset(u.get, 0, sizeof *u.get + in_len);
    u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
    u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
    u.get->oid = cpu_to_le32(oid);
    u.get->len = cpu_to_le32(in_len);
    u.get->offset = cpu_to_le32(20);

    retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
    if (unlikely(retval < 0)) {
        dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
                oid, retval);
        return retval;
    }

    off = le32_to_cpu(u.get_c->offset);
    len = le32_to_cpu(u.get_c->len);
    if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
        goto response_error;

    if (*reply_len != -1 && len != *reply_len)
        goto response_error;

    *reply = (unsigned char *) &u.get_c->request_id + off;
    *reply_len = len;

    return retval;

response_error:
    dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
            "invalid response - off %d len %d\n",
        oid, off, len);
    return -EDOM;
}

/* same as usbnet_netdev_ops but MTU change not allowed */
static const struct net_device_ops rndis_netdev_ops = {
    .ndo_open       = usbnet_open,
    .ndo_stop       = usbnet_stop,
    .ndo_start_xmit     = usbnet_start_xmit,
    .ndo_tx_timeout     = usbnet_tx_timeout,
    .ndo_set_mac_address    = eth_mac_addr,
    .ndo_validate_addr  = eth_validate_addr,
};

int
generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
{
    int         retval;
    struct net_device   *net = dev->net;
    struct cdc_state    *info = (void *) &dev->data;
    union {
        void            *buf;
        struct rndis_msg_hdr    *header;
        struct rndis_init   *init;
        struct rndis_init_c *init_c;
        struct rndis_query  *get;
        struct rndis_query_c    *get_c;
        struct rndis_set    *set;
        struct rndis_set_c  *set_c;
        struct rndis_halt   *halt;
    } u;
    u32         tmp;
    __le32          phym_unspec, *phym;
    int         reply_len;
    unsigned char       *bp;

    /* we can't rely on i/o from stack working, or stack allocation */
    u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
    if (!u.buf)
        return -ENOMEM;
    retval = usbnet_generic_cdc_bind(dev, intf);
    if (retval < 0)
        goto fail;

    u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
    u.init->msg_len = cpu_to_le32(sizeof *u.init);
    u.init->major_version = cpu_to_le32(1);
    u.init->minor_version = cpu_to_le32(0);

    /* max transfer (in spec) is 0x4000 at full speed, but for
     * TX we'll stick to one Ethernet packet plus RNDIS framing.
     * For RX we handle drivers that zero-pad to end-of-packet.
     * Don't let userspace change these settings.
     *
     * NOTE: there still seems to be wierdness here, as if we need
     * to do some more things to make sure WinCE targets accept this.
     * They default to jumbograms of 8KB or 16KB, which is absurd
     * for such low data rates and which is also more than Linux
     * can usually expect to allocate for SKB data...
     */
    net->hard_header_len += sizeof (struct rndis_data_hdr);
    dev->hard_mtu = net->mtu + net->hard_header_len;

    dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
    if (dev->maxpacket == 0) {
        netif_dbg(dev, probe, dev->net,
              "dev->maxpacket can't be 0\n");
        retval = -EINVAL;
        goto fail_and_release;
    }

    dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
    dev->rx_urb_size &= ~(dev->maxpacket - 1);
    u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);

    net->netdev_ops = &rndis_netdev_ops;

    retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
    if (unlikely(retval < 0)) {
        /* it might not even be an RNDIS device!! */
        dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
        goto fail_and_release;
    }
    tmp = le32_to_cpu(u.init_c->max_transfer_size);
    if (tmp < dev->hard_mtu) {
        if (tmp <= net->hard_header_len) {
            dev_err(&intf->dev,
                "dev can't take %u byte packets (max %u)\n",
                dev->hard_mtu, tmp);
            retval = -EINVAL;
            goto halt_fail_and_release;
        }
        dev_warn(&intf->dev,
             "dev can't take %u byte packets (max %u), "
             "adjusting MTU to %u\n",
             dev->hard_mtu, tmp, tmp - net->hard_header_len);
        dev->hard_mtu = tmp;
        net->mtu = dev->hard_mtu - net->hard_header_len;
    }

    /* REVISIT:  peripheral "alignment" request is ignored ... */
    dev_dbg(&intf->dev,
        "hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
        dev->hard_mtu, tmp, dev->rx_urb_size,
        1 << le32_to_cpu(u.init_c->packet_alignment));

    /* module has some device initialization code needs to be done right
     * after RNDIS_INIT */
    if (dev->driver_info->early_init &&
            dev->driver_info->early_init(dev) != 0)
        goto halt_fail_and_release;

    /* Check physical medium */
    phym = NULL;
    reply_len = sizeof *phym;
    retval = rndis_query(dev, intf, u.buf,
                 RNDIS_OID_GEN_PHYSICAL_MEDIUM,
                 0, (void **) &phym, &reply_len);
    if (retval != 0 || !phym) {
        /* OID is optional so don't fail here. */
        phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
        phym = &phym_unspec;
    }
    if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
        le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
        netif_dbg(dev, probe, dev->net,
              "driver requires wireless physical medium, but device is not\n");
        retval = -ENODEV;
        goto halt_fail_and_release;
    }
    if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
        le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
        netif_dbg(dev, probe, dev->net,
              "driver requires non-wireless physical medium, but device is wireless.\n");
        retval = -ENODEV;
        goto halt_fail_and_release;
    }

    /* Get designated host ethernet address */
    reply_len = ETH_ALEN;
    retval = rndis_query(dev, intf, u.buf,
                 RNDIS_OID_802_3_PERMANENT_ADDRESS,
                 48, (void **) &bp, &reply_len);
    if (unlikely(retval< 0)) {
        dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
        goto halt_fail_and_release;
    }
    memcpy(net->dev_addr, bp, ETH_ALEN);
    memcpy(net->perm_addr, bp, ETH_ALEN);

    /* set a nonzero filter to enable data transfers */
    memset(u.set, 0, sizeof *u.set);
    u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
    u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
    u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
    u.set->len = cpu_to_le32(4);
    u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
    *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);

    retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
    if (unlikely(retval < 0)) {
        dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
        goto halt_fail_and_release;
    }

    retval = 0;

    kfree(u.buf);
    return retval;

halt_fail_and_release:
    memset(u.halt, 0, sizeof *u.halt);
    u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
    u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
    (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
fail_and_release:
    usb_set_intfdata(info->data, NULL);
    usb_driver_release_interface(driver_of(intf), info->data);
    info->data = NULL;
fail:
    kfree(u.buf);
    return retval;
}
EXPORT_SYMBOL_GPL(generic_rndis_bind);

static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
{
    return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
}

void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
{
    struct rndis_halt   *halt;

    /* try to clear any rndis state/activity (no i/o from stack!) */
    halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
    if (halt) {
        halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
        halt->msg_len = cpu_to_le32(sizeof *halt);
        (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
        kfree(halt);
    }

    usbnet_cdc_unbind(dev, intf);
}
EXPORT_SYMBOL_GPL(rndis_unbind);

/*
 * DATA -- host must not write zlps
 */
int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
    /* peripheral may have batched packets to us... */
    while (likely(skb->len)) {
        struct rndis_data_hdr   *hdr = (void *)skb->data;
        struct sk_buff      *skb2;
        u32         msg_type, msg_len, data_offset, data_len;

        msg_type = le32_to_cpu(hdr->msg_type);
        msg_len = le32_to_cpu(hdr->msg_len);
        data_offset = le32_to_cpu(hdr->data_offset);
        data_len = le32_to_cpu(hdr->data_len);

        /* don't choke if we see oob, per-packet data, etc */
        if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
                || (data_offset + data_len + 8) > msg_len)) {
            dev->net->stats.rx_frame_errors++;
            netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
                   le32_to_cpu(hdr->msg_type),
                   msg_len, data_offset, data_len, skb->len);
            return 0;
        }
        skb_pull(skb, 8 + data_offset);

        /* at most one packet left? */
        if (likely((data_len - skb->len) <= sizeof *hdr)) {
            skb_trim(skb, data_len);
            break;
        }

        /* try to return all the packets in the batch */
        skb2 = skb_clone(skb, GFP_ATOMIC);
        if (unlikely(!skb2))
            break;
        skb_pull(skb, msg_len - sizeof *hdr);
        skb_trim(skb2, data_len);
        usbnet_skb_return(dev, skb2);
    }

    /* caller will usbnet_skb_return the remaining packet */
    return 1;
}
EXPORT_SYMBOL_GPL(rndis_rx_fixup);

struct sk_buff *
rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
    struct rndis_data_hdr   *hdr;
    struct sk_buff      *skb2;
    unsigned        len = skb->len;

    if (likely(!skb_cloned(skb))) {
        int room = skb_headroom(skb);

        /* enough head room as-is? */
        if (unlikely((sizeof *hdr) <= room))
            goto fill;

        /* enough room, but needs to be readjusted? */
        room += skb_tailroom(skb);
        if (likely((sizeof *hdr) <= room)) {
            skb->data = memmove(skb->head + sizeof *hdr,
                        skb->data, len);
            skb_set_tail_pointer(skb, len);
            goto fill;
        }
    }

    /* create a new skb, with the correct size (and tailpad) */
    skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
    dev_kfree_skb_any(skb);
    if (unlikely(!skb2))
        return skb2;
    skb = skb2;

    /* fill out the RNDIS header.  we won't bother trying to batch
     * packets; Linux minimizes wasted bandwidth through tx queues.
     */
fill:
    hdr = (void *) __skb_push(skb, sizeof *hdr);
    memset(hdr, 0, sizeof *hdr);
    hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
    hdr->msg_len = cpu_to_le32(skb->len);
    hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
    hdr->data_len = cpu_to_le32(len);

    /* FIXME make the last packet always be short ... */
    return skb;
}
EXPORT_SYMBOL_GPL(rndis_tx_fixup);


static const struct driver_info rndis_info = {
    .description =  "RNDIS device",
    .flags =    FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
    .bind =     rndis_bind,
    .unbind =   rndis_unbind,
    .status =   rndis_status,
    .rx_fixup = rndis_rx_fixup,
    .tx_fixup = rndis_tx_fixup,
};

static const struct driver_info rndis_poll_status_info = {
    .description =  "RNDIS device (poll status before control)",
    .flags =    FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
    .data =     RNDIS_DRIVER_DATA_POLL_STATUS,
    .bind =     rndis_bind,
    .unbind =   rndis_unbind,
    .status =   rndis_status,
    .rx_fixup = rndis_rx_fixup,
    .tx_fixup = rndis_tx_fixup,
};

/*-------------------------------------------------------------------------*/

static const struct usb_device_id   products [] = {
{
    /* 2Wire HomePortal 1000SW */
    USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
                      USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
    .driver_info = (unsigned long) &rndis_poll_status_info,
}, {
    /* RNDIS is MSFT's un-official variant of CDC ACM */
    USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
    .driver_info = (unsigned long) &rndis_info,
}, {
    /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
    USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
    .driver_info = (unsigned long) &rndis_poll_status_info,
}, {
    /* RNDIS for tethering */
    USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
    .driver_info = (unsigned long) &rndis_info,
},
    { },        // END
};
MODULE_DEVICE_TABLE(usb, products);

static struct usb_driver rndis_driver = {
    .name =     "rndis_host",
    .id_table = products,
    .probe =    usbnet_probe,
    .disconnect =   usbnet_disconnect,
    .suspend =  usbnet_suspend,
    .resume =   usbnet_resume,
    .disable_hub_initiated_lpm = 1,
};

module_usb_driver(rndis_driver);

MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("USB Host side RNDIS driver");
MODULE_LICENSE("GPL");