drivers/net/usb/rndis_host.c

   1 /*
   2  * Host Side support for RNDIS Networking Links
   3  * Copyright (C) 2005 by David Brownell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 // #define      DEBUG                   // error path messages, extra info
  21 // #define      VERBOSE                 // more; success messages
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <linux/workqueue.h>
  29 #include <linux/mii.h>
  30 #include <linux/usb.h>
  31 #include <linux/usb/cdc.h>
  32 #include <linux/usb/usbnet.h>
  33 #include <linux/usb/rndis_host.h>
  34
  35
  36 /*
  37  * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
  38  * course ACM was intended for modems, not Ethernet links!  USB's standard
  39  * for Ethernet links is "CDC Ethernet", which is significantly simpler.
  40  *
  41  * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
  42  * include:
  43  *    - Power management in particular relies on information that's scattered
  44  *      through other documentation, and which is incomplete or incorrect even
  45  *      there.
  46  *    - There are various undocumented protocol requirements, such as the
  47  *      need to send unused garbage in control-OUT messages.
  48  *    - In some cases, MS-Windows will emit undocumented requests; this
  49  *      matters more to peripheral implementations than host ones.
  50  *
  51  * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
  52  *
  53  * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
  54  * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
  55  * currently rare) "Ethernet Emulation Model" (EEM).
  56  */
  57
  58 /*
  59  * RNDIS notifications from device: command completion; "reverse"
  60  * keepalives; etc
  61  */
  62 void rndis_status(struct usbnet *dev, struct urb *urb)
  63 {
  64         devdbg(dev, "rndis status urb, len %d stat %d",
  65                 urb->actual_length, urb->status);
  66         // FIXME for keepalives, respond immediately (asynchronously)
  67         // if not an RNDIS status, do like cdc_status(dev,urb) does
  68 }
  69 EXPORT_SYMBOL_GPL(rndis_status);
  70
  71 /*
  72  * RPC done RNDIS-style.  Caller guarantees:
  73  * - message is properly byteswapped
  74  * - there's no other request pending
  75  * - buf can hold up to 1KB response (required by RNDIS spec)
  76  * On return, the first few entries are already byteswapped.
  77  *
  78  * Call context is likely probe(), before interface name is known,
  79  * which is why we won't try to use it in the diagnostics.
  80  */
  81 int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf)
  82 {
  83         struct cdc_state        *info = (void *) &dev->data;
  84         int                     master_ifnum;
  85         int                     retval;
  86         unsigned                count;
  87         __le32                  rsp;
  88         u32                     xid = 0, msg_len, request_id;
  89
  90         /* REVISIT when this gets called from contexts other than probe() or
  91          * disconnect(): either serialize, or dispatch responses on xid
  92          */
  93
  94         /* Issue the request; xid is unique, don't bother byteswapping it */
  95         if (likely(buf->msg_type != RNDIS_MSG_HALT
  96                         && buf->msg_type != RNDIS_MSG_RESET)) {
  97                 xid = dev->xid++;
  98                 if (!xid)
  99                         xid = dev->xid++;
 100                 buf->request_id = (__force __le32) xid;
 101         }
 102         master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
 103         retval = usb_control_msg(dev->udev,
 104                 usb_sndctrlpipe(dev->udev, 0),
 105                 USB_CDC_SEND_ENCAPSULATED_COMMAND,
 106                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 107                 0, master_ifnum,
 108                 buf, le32_to_cpu(buf->msg_len),
 109                 RNDIS_CONTROL_TIMEOUT_MS);
 110         if (unlikely(retval < 0 || xid == 0))
 111                 return retval;
 112
 113         // FIXME Seems like some devices discard responses when
 114         // we time out and cancel our "get response" requests...
 115         // so, this is fragile.  Probably need to poll for status.
 116
 117         /* ignore status endpoint, just poll the control channel;
 118          * the request probably completed immediately
 119          */
 120         rsp = buf->msg_type | RNDIS_MSG_COMPLETION;
 121         for (count = 0; count < 10; count++) {
 122                 memset(buf, 0, CONTROL_BUFFER_SIZE);
 123                 retval = usb_control_msg(dev->udev,
 124                         usb_rcvctrlpipe(dev->udev, 0),
 125                         USB_CDC_GET_ENCAPSULATED_RESPONSE,
 126                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 127                         0, master_ifnum,
 128                         buf, CONTROL_BUFFER_SIZE,
 129                         RNDIS_CONTROL_TIMEOUT_MS);
 130                 if (likely(retval >= 8)) {
 131                         msg_len = le32_to_cpu(buf->msg_len);
 132                         request_id = (__force u32) buf->request_id;
 133                         if (likely(buf->msg_type == rsp)) {
 134                                 if (likely(request_id == xid)) {
 135                                         if (unlikely(rsp == RNDIS_MSG_RESET_C))
 136                                                 return 0;
 137                                         if (likely(RNDIS_STATUS_SUCCESS
 138                                                         == buf->status))
 139                                                 return 0;
 140                                         dev_dbg(&info->control->dev,
 141                                                 "rndis reply status %08x\n",
 142                                                 le32_to_cpu(buf->status));
 143                                         return -EL3RST;
 144                                 }
 145                                 dev_dbg(&info->control->dev,
 146                                         "rndis reply id %d expected %d\n",
 147                                         request_id, xid);
 148                                 /* then likely retry */
 149                         } else switch (buf->msg_type) {
 150                         case RNDIS_MSG_INDICATE: {      /* fault/event */
 151                                 struct rndis_indicate *msg = (void *)buf;
 152                                 int state = 0;
 153
 154                                 switch (msg->status) {
 155                                 case RNDIS_STATUS_MEDIA_CONNECT:
 156                                         state = 1;
 157                                 case RNDIS_STATUS_MEDIA_DISCONNECT:
 158                                         dev_info(&info->control->dev,
 159                                                 "rndis media %sconnect\n",
 160                                                 !state?"dis":"");
 161                                         if (dev->driver_info->link_change)
 162                                                 dev->driver_info->link_change(
 163                                                         dev, state);
 164                                         break;
 165                                 default:
 166                                         dev_info(&info->control->dev,
 167                                                 "rndis indication: 0x%08x\n",
 168                                                 le32_to_cpu(msg->status));
 169                                 }
 170                                 }
 171                                 break;
 172                         case RNDIS_MSG_KEEPALIVE: {     /* ping */
 173                                 struct rndis_keepalive_c *msg = (void *)buf;
 174
 175                                 msg->msg_type = RNDIS_MSG_KEEPALIVE_C;
 176                                 msg->msg_len = ccpu2(sizeof *msg);
 177                                 msg->status = RNDIS_STATUS_SUCCESS;
 178                                 retval = usb_control_msg(dev->udev,
 179                                         usb_sndctrlpipe(dev->udev, 0),
 180                                         USB_CDC_SEND_ENCAPSULATED_COMMAND,
 181                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 182                                         0, master_ifnum,
 183                                         msg, sizeof *msg,
 184                                         RNDIS_CONTROL_TIMEOUT_MS);
 185                                 if (unlikely(retval < 0))
 186                                         dev_dbg(&info->control->dev,
 187                                                 "rndis keepalive err %d\n",
 188                                                 retval);
 189                                 }
 190                                 break;
 191                         default:
 192                                 dev_dbg(&info->control->dev,
 193                                         "unexpected rndis msg %08x len %d\n",
 194                                         le32_to_cpu(buf->msg_type), msg_len);
 195                         }
 196                 } else {
 197                         /* device probably issued a protocol stall; ignore */
 198                         dev_dbg(&info->control->dev,
 199                                 "rndis response error, code %d\n", retval);
 200                 }
 201                 msleep(2);
 202         }
 203         dev_dbg(&info->control->dev, "rndis response timeout\n");
 204         return -ETIMEDOUT;
 205 }
 206 EXPORT_SYMBOL_GPL(rndis_command);
 207
 208 /*
 209  * rndis_query:
 210  *
 211  * Performs a query for @oid along with 0 or more bytes of payload as
 212  * specified by @in_len. If @reply_len is not set to -1 then the reply
 213  * length is checked against this value, resulting in an error if it
 214  * doesn't match.
 215  *
 216  * NOTE: Adding a payload exactly or greater than the size of the expected
 217  * response payload is an evident requirement MSFT added for ActiveSync.
 218  *
 219  * The only exception is for OIDs that return a variably sized response,
 220  * in which case no payload should be added.  This undocumented (and
 221  * nonsensical!) issue was found by sniffing protocol requests from the
 222  * ActiveSync 4.1 Windows driver.
 223  */
 224 static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
 225                 void *buf, u32 oid, u32 in_len,
 226                 void **reply, int *reply_len)
 227 {
 228         int retval;
 229         union {
 230                 void                    *buf;
 231                 struct rndis_msg_hdr    *header;
 232                 struct rndis_query      *get;
 233                 struct rndis_query_c    *get_c;
 234         } u;
 235         u32 off, len;
 236
 237         u.buf = buf;
 238
 239         memset(u.get, 0, sizeof *u.get + in_len);
 240         u.get->msg_type = RNDIS_MSG_QUERY;
 241         u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
 242         u.get->oid = oid;
 243         u.get->len = cpu_to_le32(in_len);
 244         u.get->offset = ccpu2(20);
 245
 246         retval = rndis_command(dev, u.header);
 247         if (unlikely(retval < 0)) {
 248                 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
 249                                 oid, retval);
 250                 return retval;
 251         }
 252
 253         off = le32_to_cpu(u.get_c->offset);
 254         len = le32_to_cpu(u.get_c->len);
 255         if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
 256                 goto response_error;
 257
 258         if (*reply_len != -1 && len != *reply_len)
 259                 goto response_error;
 260
 261         *reply = (unsigned char *) &u.get_c->request_id + off;
 262         *reply_len = len;
 263
 264         return retval;
 265
 266 response_error:
 267         dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
 268                         "invalid response - off %d len %d\n",
 269                 oid, off, len);
 270         return -EDOM;
 271 }
 272
 273 int
 274 generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
 275 {
 276         int                     retval;
 277         struct net_device       *net = dev->net;
 278         struct cdc_state        *info = (void *) &dev->data;
 279         union {
 280                 void                    *buf;
 281                 struct rndis_msg_hdr    *header;
 282                 struct rndis_init       *init;
 283                 struct rndis_init_c     *init_c;
 284                 struct rndis_query      *get;
 285                 struct rndis_query_c    *get_c;
 286                 struct rndis_set        *set;
 287                 struct rndis_set_c      *set_c;
 288                 struct rndis_halt       *halt;
 289         } u;
 290         u32                     tmp, *phym;
 291         int                     reply_len;
 292         unsigned char           *bp;
 293
 294         /* we can't rely on i/o from stack working, or stack allocation */
 295         u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
 296         if (!u.buf)
 297                 return -ENOMEM;
 298         retval = usbnet_generic_cdc_bind(dev, intf);
 299         if (retval < 0)
 300                 goto fail;
 301
 302         u.init->msg_type = RNDIS_MSG_INIT;
 303         u.init->msg_len = ccpu2(sizeof *u.init);
 304         u.init->major_version = ccpu2(1);
 305         u.init->minor_version = ccpu2(0);
 306
 307         /* max transfer (in spec) is 0x4000 at full speed, but for
 308          * TX we'll stick to one Ethernet packet plus RNDIS framing.
 309          * For RX we handle drivers that zero-pad to end-of-packet.
 310          * Don't let userspace change these settings.
 311          *
 312          * NOTE: there still seems to be wierdness here, as if we need
 313          * to do some more things to make sure WinCE targets accept this.
 314          * They default to jumbograms of 8KB or 16KB, which is absurd
 315          * for such low data rates and which is also more than Linux
 316          * can usually expect to allocate for SKB data...
 317          */
 318         net->hard_header_len += sizeof (struct rndis_data_hdr);
 319         dev->hard_mtu = net->mtu + net->hard_header_len;
 320
 321         dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
 322         dev->rx_urb_size &= ~(dev->maxpacket - 1);
 323         u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
 324
 325         net->change_mtu = NULL;
 326         retval = rndis_command(dev, u.header);
 327         if (unlikely(retval < 0)) {
 328                 /* it might not even be an RNDIS device!! */
 329                 dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
 330                 goto fail_and_release;
 331         }
 332         tmp = le32_to_cpu(u.init_c->max_transfer_size);
 333         if (tmp < dev->hard_mtu) {
 334                 if (tmp <= net->hard_header_len) {
 335                         dev_err(&intf->dev,
 336                                 "dev can't take %u byte packets (max %u)\n",
 337                                 dev->hard_mtu, tmp);
 338                         retval = -EINVAL;
 339                         goto halt_fail_and_release;
 340                 }
 341                 dev->hard_mtu = tmp;
 342                 net->mtu = dev->hard_mtu - net->hard_header_len;
 343                 dev_warn(&intf->dev,
 344                          "dev can't take %u byte packets (max %u), "
 345                          "adjusting MTU to %u\n",
 346                          dev->hard_mtu, tmp, net->mtu);
 347         }
 348
 349         /* REVISIT:  peripheral "alignment" request is ignored ... */
 350         dev_dbg(&intf->dev,
 351                 "hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
 352                 dev->hard_mtu, tmp, dev->rx_urb_size,
 353                 1 << le32_to_cpu(u.init_c->packet_alignment));
 354
 355         /* module has some device initialization code needs to be done right
 356          * after RNDIS_INIT */
 357         if (dev->driver_info->early_init &&
 358                         dev->driver_info->early_init(dev) != 0)
 359                 goto halt_fail_and_release;
 360
 361         /* Check physical medium */
 362         reply_len = sizeof *phym;
 363         retval = rndis_query(dev, intf, u.buf, OID_GEN_PHYSICAL_MEDIUM,
 364                         0, (void **) &phym, &reply_len);
 365         if (retval != 0)
 366                 /* OID is optional so don't fail here. */
 367                 *phym = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED;
 368         if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
 369                         *phym != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
 370                 if (netif_msg_probe(dev))
 371                         dev_dbg(&intf->dev, "driver requires wireless "
 372                                 "physical medium, but device is not.\n");
 373                 retval = -ENODEV;
 374                 goto halt_fail_and_release;
 375         }
 376         if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
 377                         *phym == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
 378                 if (netif_msg_probe(dev))
 379                         dev_dbg(&intf->dev, "driver requires non-wireless "
 380                                 "physical medium, but device is wireless.\n");
 381                 retval = -ENODEV;
 382                 goto halt_fail_and_release;
 383         }
 384
 385         /* Get designated host ethernet address */
 386         reply_len = ETH_ALEN;
 387         retval = rndis_query(dev, intf, u.buf, OID_802_3_PERMANENT_ADDRESS,
 388                         48, (void **) &bp, &reply_len);
 389         if (unlikely(retval< 0)) {
 390                 dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
 391                 goto halt_fail_and_release;
 392         }
 393         memcpy(net->dev_addr, bp, ETH_ALEN);
 394
 395         /* set a nonzero filter to enable data transfers */
 396         memset(u.set, 0, sizeof *u.set);
 397         u.set->msg_type = RNDIS_MSG_SET;
 398         u.set->msg_len = ccpu2(4 + sizeof *u.set);
 399         u.set->oid = OID_GEN_CURRENT_PACKET_FILTER;
 400         u.set->len = ccpu2(4);
 401         u.set->offset = ccpu2((sizeof *u.set) - 8);
 402         *(__le32 *)(u.buf + sizeof *u.set) = RNDIS_DEFAULT_FILTER;
 403
 404         retval = rndis_command(dev, u.header);
 405         if (unlikely(retval < 0)) {
 406                 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
 407                 goto halt_fail_and_release;
 408         }
 409
 410         retval = 0;
 411
 412         kfree(u.buf);
 413         return retval;
 414
 415 halt_fail_and_release:
 416         memset(u.halt, 0, sizeof *u.halt);
 417         u.halt->msg_type = RNDIS_MSG_HALT;
 418         u.halt->msg_len = ccpu2(sizeof *u.halt);
 419         (void) rndis_command(dev, (void *)u.halt);
 420 fail_and_release:
 421         usb_set_intfdata(info->data, NULL);
 422         usb_driver_release_interface(driver_of(intf), info->data);
 423         info->data = NULL;
 424 fail:
 425         kfree(u.buf);
 426         return retval;
 427 }
 428 EXPORT_SYMBOL_GPL(generic_rndis_bind);
 429
 430 static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
 431 {
 432         return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
 433 }
 434
 435 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
 436 {
 437         struct rndis_halt       *halt;
 438
 439         /* try to clear any rndis state/activity (no i/o from stack!) */
 440         halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
 441         if (halt) {
 442                 halt->msg_type = RNDIS_MSG_HALT;
 443                 halt->msg_len = ccpu2(sizeof *halt);
 444                 (void) rndis_command(dev, (void *)halt);
 445                 kfree(halt);
 446         }
 447
 448         usbnet_cdc_unbind(dev, intf);
 449 }
 450 EXPORT_SYMBOL_GPL(rndis_unbind);
 451
 452 /*
 453  * DATA -- host must not write zlps
 454  */
 455 int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 456 {
 457         /* peripheral may have batched packets to us... */
 458         while (likely(skb->len)) {
 459                 struct rndis_data_hdr   *hdr = (void *)skb->data;
 460                 struct sk_buff          *skb2;
 461                 u32                     msg_len, data_offset, data_len;
 462
 463                 msg_len = le32_to_cpu(hdr->msg_len);
 464                 data_offset = le32_to_cpu(hdr->data_offset);
 465                 data_len = le32_to_cpu(hdr->data_len);
 466
 467                 /* don't choke if we see oob, per-packet data, etc */
 468                 if (unlikely(hdr->msg_type != RNDIS_MSG_PACKET
 469                                 || skb->len < msg_len
 470                                 || (data_offset + data_len + 8) > msg_len)) {
 471                         dev->stats.rx_frame_errors++;
 472                         devdbg(dev, "bad rndis message %d/%d/%d/%d, len %d",
 473                                 le32_to_cpu(hdr->msg_type),
 474                                 msg_len, data_offset, data_len, skb->len);
 475                         return 0;
 476                 }
 477                 skb_pull(skb, 8 + data_offset);
 478
 479                 /* at most one packet left? */
 480                 if (likely((data_len - skb->len) <= sizeof *hdr)) {
 481                         skb_trim(skb, data_len);
 482                         break;
 483                 }
 484
 485                 /* try to return all the packets in the batch */
 486                 skb2 = skb_clone(skb, GFP_ATOMIC);
 487                 if (unlikely(!skb2))
 488                         break;
 489                 skb_pull(skb, msg_len - sizeof *hdr);
 490                 skb_trim(skb2, data_len);
 491                 usbnet_skb_return(dev, skb2);
 492         }
 493
 494         /* caller will usbnet_skb_return the remaining packet */
 495         return 1;
 496 }
 497 EXPORT_SYMBOL_GPL(rndis_rx_fixup);
 498
 499 struct sk_buff *
 500 rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
 501 {
 502         struct rndis_data_hdr   *hdr;
 503         struct sk_buff          *skb2;
 504         unsigned                len = skb->len;
 505
 506         if (likely(!skb_cloned(skb))) {
 507                 int     room = skb_headroom(skb);
 508
 509                 /* enough head room as-is? */
 510                 if (unlikely((sizeof *hdr) <= room))
 511                         goto fill;
 512
 513                 /* enough room, but needs to be readjusted? */
 514                 room += skb_tailroom(skb);
 515                 if (likely((sizeof *hdr) <= room)) {
 516                         skb->data = memmove(skb->head + sizeof *hdr,
 517                                             skb->data, len);
 518                         skb_set_tail_pointer(skb, len);
 519                         goto fill;
 520                 }
 521         }
 522
 523         /* create a new skb, with the correct size (and tailpad) */
 524         skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
 525         dev_kfree_skb_any(skb);
 526         if (unlikely(!skb2))
 527                 return skb2;
 528         skb = skb2;
 529
 530         /* fill out the RNDIS header.  we won't bother trying to batch
 531          * packets; Linux minimizes wasted bandwidth through tx queues.
 532          */
 533 fill:
 534         hdr = (void *) __skb_push(skb, sizeof *hdr);
 535         memset(hdr, 0, sizeof *hdr);
 536         hdr->msg_type = RNDIS_MSG_PACKET;
 537         hdr->msg_len = cpu_to_le32(skb->len);
 538         hdr->data_offset = ccpu2(sizeof(*hdr) - 8);
 539         hdr->data_len = cpu_to_le32(len);
 540
 541         /* FIXME make the last packet always be short ... */
 542         return skb;
 543 }
 544 EXPORT_SYMBOL_GPL(rndis_tx_fixup);
 545
 546
 547 static const struct driver_info rndis_info = {
 548         .description =  "RNDIS device",
 549         .flags =        FLAG_ETHER | FLAG_FRAMING_RN | FLAG_NO_SETINT,
 550         .bind =         rndis_bind,
 551         .unbind =       rndis_unbind,
 552         .status =       rndis_status,
 553         .rx_fixup =     rndis_rx_fixup,
 554         .tx_fixup =     rndis_tx_fixup,
 555 };
 556
 557 #undef ccpu2
 558
 559
 560 /*-------------------------------------------------------------------------*/
 561
 562 static const struct usb_device_id       products [] = {
 563 {
 564         /* RNDIS is MSFT's un-official variant of CDC ACM */
 565         USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
 566         .driver_info = (unsigned long) &rndis_info,
 567 }, {
 568         /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
 569         USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
 570         .driver_info = (unsigned long) &rndis_info,
 571 },
 572         { },            // END
 573 };
 574 MODULE_DEVICE_TABLE(usb, products);
 575
 576 static struct usb_driver rndis_driver = {
 577         .name =         "rndis_host",
 578         .id_table =     products,
 579         .probe =        usbnet_probe,
 580         .disconnect =   usbnet_disconnect,
 581         .suspend =      usbnet_suspend,
 582         .resume =       usbnet_resume,
 583 };
 584
 585 static int __init rndis_init(void)
 586 {
 587         return usb_register(&rndis_driver);
 588 }
 589 module_init(rndis_init);
 590
 591 static void __exit rndis_exit(void)
 592 {
 593         usb_deregister(&rndis_driver);
 594 }
 595 module_exit(rndis_exit);
 596
 597 MODULE_AUTHOR("David Brownell");
 598 MODULE_DESCRIPTION("USB Host side RNDIS driver");
 599 MODULE_LICENSE("GPL");