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Linux/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, see <http://www.gnu.org/licenses/>.
 17  */
 18 #include <linux/module.h>
 19 #include <linux/netdevice.h>
 20 #include <linux/etherdevice.h>
 21 #include <linux/ethtool.h>
 22 #include <linux/workqueue.h>
 23 #include <linux/slab.h>
 24 #include <linux/mii.h>
 25 #include <linux/usb.h>
 26 #include <linux/usb/cdc.h>
 27 #include <linux/usb/usbnet.h>
 28 #include <linux/usb/rndis_host.h>
 29 
 30 
 31 /*
 32  * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
 33  * course ACM was intended for modems, not Ethernet links!  USB's standard
 34  * for Ethernet links is "CDC Ethernet", which is significantly simpler.
 35  *
 36  * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
 37  * include:
 38  *    - Power management in particular relies on information that's scattered
 39  *      through other documentation, and which is incomplete or incorrect even
 40  *      there.
 41  *    - There are various undocumented protocol requirements, such as the
 42  *      need to send unused garbage in control-OUT messages.
 43  *    - In some cases, MS-Windows will emit undocumented requests; this
 44  *      matters more to peripheral implementations than host ones.
 45  *
 46  * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
 47  *
 48  * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
 49  * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
 50  * currently rare) "Ethernet Emulation Model" (EEM).
 51  */
 52 
 53 /*
 54  * RNDIS notifications from device: command completion; "reverse"
 55  * keepalives; etc
 56  */
 57 void rndis_status(struct usbnet *dev, struct urb *urb)
 58 {
 59         netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
 60                    urb->actual_length, urb->status);
 61         // FIXME for keepalives, respond immediately (asynchronously)
 62         // if not an RNDIS status, do like cdc_status(dev,urb) does
 63 }
 64 EXPORT_SYMBOL_GPL(rndis_status);
 65 
 66 /*
 67  * RNDIS indicate messages.
 68  */
 69 static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
 70                                 int buflen)
 71 {
 72         struct cdc_state *info = (void *)&dev->data;
 73         struct device *udev = &info->control->dev;
 74 
 75         if (dev->driver_info->indication) {
 76                 dev->driver_info->indication(dev, msg, buflen);
 77         } else {
 78                 u32 status = le32_to_cpu(msg->status);
 79 
 80                 switch (status) {
 81                 case RNDIS_STATUS_MEDIA_CONNECT:
 82                         dev_info(udev, "rndis media connect\n");
 83                         break;
 84                 case RNDIS_STATUS_MEDIA_DISCONNECT:
 85                         dev_info(udev, "rndis media disconnect\n");
 86                         break;
 87                 default:
 88                         dev_info(udev, "rndis indication: 0x%08x\n", status);
 89                 }
 90         }
 91 }
 92 
 93 /*
 94  * RPC done RNDIS-style.  Caller guarantees:
 95  * - message is properly byteswapped
 96  * - there's no other request pending
 97  * - buf can hold up to 1KB response (required by RNDIS spec)
 98  * On return, the first few entries are already byteswapped.
 99  *
100  * Call context is likely probe(), before interface name is known,
101  * which is why we won't try to use it in the diagnostics.
102  */
103 int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
104 {
105         struct cdc_state        *info = (void *) &dev->data;
106         struct usb_cdc_notification notification;
107         int                     master_ifnum;
108         int                     retval;
109         int                     partial;
110         unsigned                count;
111         u32                     xid = 0, msg_len, request_id, msg_type, rsp,
112                                 status;
113 
114         /* REVISIT when this gets called from contexts other than probe() or
115          * disconnect(): either serialize, or dispatch responses on xid
116          */
117 
118         msg_type = le32_to_cpu(buf->msg_type);
119 
120         /* Issue the request; xid is unique, don't bother byteswapping it */
121         if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
122                 xid = dev->xid++;
123                 if (!xid)
124                         xid = dev->xid++;
125                 buf->request_id = (__force __le32) xid;
126         }
127         master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
128         retval = usb_control_msg(dev->udev,
129                 usb_sndctrlpipe(dev->udev, 0),
130                 USB_CDC_SEND_ENCAPSULATED_COMMAND,
131                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
132                 0, master_ifnum,
133                 buf, le32_to_cpu(buf->msg_len),
134                 RNDIS_CONTROL_TIMEOUT_MS);
135         if (unlikely(retval < 0 || xid == 0))
136                 return retval;
137 
138         /* Some devices don't respond on the control channel until
139          * polled on the status channel, so do that first. */
140         if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
141                 retval = usb_interrupt_msg(
142                         dev->udev,
143                         usb_rcvintpipe(dev->udev,
144                                        dev->status->desc.bEndpointAddress),
145                         &notification, sizeof(notification), &partial,
146                         RNDIS_CONTROL_TIMEOUT_MS);
147                 if (unlikely(retval < 0))
148                         return retval;
149         }
150 
151         /* Poll the control channel; the request probably completed immediately */
152         rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
153         for (count = 0; count < 10; count++) {
154                 memset(buf, 0, CONTROL_BUFFER_SIZE);
155                 retval = usb_control_msg(dev->udev,
156                         usb_rcvctrlpipe(dev->udev, 0),
157                         USB_CDC_GET_ENCAPSULATED_RESPONSE,
158                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
159                         0, master_ifnum,
160                         buf, buflen,
161                         RNDIS_CONTROL_TIMEOUT_MS);
162                 if (likely(retval >= 8)) {
163                         msg_type = le32_to_cpu(buf->msg_type);
164                         msg_len = le32_to_cpu(buf->msg_len);
165                         status = le32_to_cpu(buf->status);
166                         request_id = (__force u32) buf->request_id;
167                         if (likely(msg_type == rsp)) {
168                                 if (likely(request_id == xid)) {
169                                         if (unlikely(rsp == RNDIS_MSG_RESET_C))
170                                                 return 0;
171                                         if (likely(RNDIS_STATUS_SUCCESS ==
172                                                         status))
173                                                 return 0;
174                                         dev_dbg(&info->control->dev,
175                                                 "rndis reply status %08x\n",
176                                                 status);
177                                         return -EL3RST;
178                                 }
179                                 dev_dbg(&info->control->dev,
180                                         "rndis reply id %d expected %d\n",
181                                         request_id, xid);
182                                 /* then likely retry */
183                         } else switch (msg_type) {
184                         case RNDIS_MSG_INDICATE: /* fault/event */
185                                 rndis_msg_indicate(dev, (void *)buf, buflen);
186                                 break;
187                         case RNDIS_MSG_KEEPALIVE: { /* ping */
188                                 struct rndis_keepalive_c *msg = (void *)buf;
189 
190                                 msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
191                                 msg->msg_len = cpu_to_le32(sizeof *msg);
192                                 msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
193                                 retval = usb_control_msg(dev->udev,
194                                         usb_sndctrlpipe(dev->udev, 0),
195                                         USB_CDC_SEND_ENCAPSULATED_COMMAND,
196                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE,
197                                         0, master_ifnum,
198                                         msg, sizeof *msg,
199                                         RNDIS_CONTROL_TIMEOUT_MS);
200                                 if (unlikely(retval < 0))
201                                         dev_dbg(&info->control->dev,
202                                                 "rndis keepalive err %d\n",
203                                                 retval);
204                                 }
205                                 break;
206                         default:
207                                 dev_dbg(&info->control->dev,
208                                         "unexpected rndis msg %08x len %d\n",
209                                         le32_to_cpu(buf->msg_type), msg_len);
210                         }
211                 } else {
212                         /* device probably issued a protocol stall; ignore */
213                         dev_dbg(&info->control->dev,
214                                 "rndis response error, code %d\n", retval);
215                 }
216                 msleep(20);
217         }
218         dev_dbg(&info->control->dev, "rndis response timeout\n");
219         return -ETIMEDOUT;
220 }
221 EXPORT_SYMBOL_GPL(rndis_command);
222 
223 /*
224  * rndis_query:
225  *
226  * Performs a query for @oid along with 0 or more bytes of payload as
227  * specified by @in_len. If @reply_len is not set to -1 then the reply
228  * length is checked against this value, resulting in an error if it
229  * doesn't match.
230  *
231  * NOTE: Adding a payload exactly or greater than the size of the expected
232  * response payload is an evident requirement MSFT added for ActiveSync.
233  *
234  * The only exception is for OIDs that return a variably sized response,
235  * in which case no payload should be added.  This undocumented (and
236  * nonsensical!) issue was found by sniffing protocol requests from the
237  * ActiveSync 4.1 Windows driver.
238  */
239 static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
240                 void *buf, u32 oid, u32 in_len,
241                 void **reply, int *reply_len)
242 {
243         int retval;
244         union {
245                 void                    *buf;
246                 struct rndis_msg_hdr    *header;
247                 struct rndis_query      *get;
248                 struct rndis_query_c    *get_c;
249         } u;
250         u32 off, len;
251 
252         u.buf = buf;
253 
254         memset(u.get, 0, sizeof *u.get + in_len);
255         u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
256         u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
257         u.get->oid = cpu_to_le32(oid);
258         u.get->len = cpu_to_le32(in_len);
259         u.get->offset = cpu_to_le32(20);
260 
261         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
262         if (unlikely(retval < 0)) {
263                 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
264                                 oid, retval);
265                 return retval;
266         }
267 
268         off = le32_to_cpu(u.get_c->offset);
269         len = le32_to_cpu(u.get_c->len);
270         if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
271                 goto response_error;
272 
273         if (*reply_len != -1 && len != *reply_len)
274                 goto response_error;
275 
276         *reply = (unsigned char *) &u.get_c->request_id + off;
277         *reply_len = len;
278 
279         return retval;
280 
281 response_error:
282         dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
283                         "invalid response - off %d len %d\n",
284                 oid, off, len);
285         return -EDOM;
286 }
287 
288 /* same as usbnet_netdev_ops but MTU change not allowed */
289 static const struct net_device_ops rndis_netdev_ops = {
290         .ndo_open               = usbnet_open,
291         .ndo_stop               = usbnet_stop,
292         .ndo_start_xmit         = usbnet_start_xmit,
293         .ndo_tx_timeout         = usbnet_tx_timeout,
294         .ndo_set_mac_address    = eth_mac_addr,
295         .ndo_validate_addr      = eth_validate_addr,
296 };
297 
298 int
299 generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
300 {
301         int                     retval;
302         struct net_device       *net = dev->net;
303         struct cdc_state        *info = (void *) &dev->data;
304         union {
305                 void                    *buf;
306                 struct rndis_msg_hdr    *header;
307                 struct rndis_init       *init;
308                 struct rndis_init_c     *init_c;
309                 struct rndis_query      *get;
310                 struct rndis_query_c    *get_c;
311                 struct rndis_set        *set;
312                 struct rndis_set_c      *set_c;
313                 struct rndis_halt       *halt;
314         } u;
315         u32                     tmp;
316         __le32                  phym_unspec, *phym;
317         int                     reply_len;
318         unsigned char           *bp;
319 
320         /* we can't rely on i/o from stack working, or stack allocation */
321         u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
322         if (!u.buf)
323                 return -ENOMEM;
324         retval = usbnet_generic_cdc_bind(dev, intf);
325         if (retval < 0)
326                 goto fail;
327 
328         u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
329         u.init->msg_len = cpu_to_le32(sizeof *u.init);
330         u.init->major_version = cpu_to_le32(1);
331         u.init->minor_version = cpu_to_le32(0);
332 
333         /* max transfer (in spec) is 0x4000 at full speed, but for
334          * TX we'll stick to one Ethernet packet plus RNDIS framing.
335          * For RX we handle drivers that zero-pad to end-of-packet.
336          * Don't let userspace change these settings.
337          *
338          * NOTE: there still seems to be wierdness here, as if we need
339          * to do some more things to make sure WinCE targets accept this.
340          * They default to jumbograms of 8KB or 16KB, which is absurd
341          * for such low data rates and which is also more than Linux
342          * can usually expect to allocate for SKB data...
343          */
344         net->hard_header_len += sizeof (struct rndis_data_hdr);
345         dev->hard_mtu = net->mtu + net->hard_header_len;
346 
347         dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
348         if (dev->maxpacket == 0) {
349                 netif_dbg(dev, probe, dev->net,
350                           "dev->maxpacket can't be 0\n");
351                 retval = -EINVAL;
352                 goto fail_and_release;
353         }
354 
355         dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
356         dev->rx_urb_size &= ~(dev->maxpacket - 1);
357         u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
358 
359         net->netdev_ops = &rndis_netdev_ops;
360 
361         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
362         if (unlikely(retval < 0)) {
363                 /* it might not even be an RNDIS device!! */
364                 dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
365                 goto fail_and_release;
366         }
367         tmp = le32_to_cpu(u.init_c->max_transfer_size);
368         if (tmp < dev->hard_mtu) {
369                 if (tmp <= net->hard_header_len) {
370                         dev_err(&intf->dev,
371                                 "dev can't take %u byte packets (max %u)\n",
372                                 dev->hard_mtu, tmp);
373                         retval = -EINVAL;
374                         goto halt_fail_and_release;
375                 }
376                 dev_warn(&intf->dev,
377                          "dev can't take %u byte packets (max %u), "
378                          "adjusting MTU to %u\n",
379                          dev->hard_mtu, tmp, tmp - net->hard_header_len);
380                 dev->hard_mtu = tmp;
381                 net->mtu = dev->hard_mtu - net->hard_header_len;
382         }
383 
384         /* REVISIT:  peripheral "alignment" request is ignored ... */
385         dev_dbg(&intf->dev,
386                 "hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
387                 dev->hard_mtu, tmp, dev->rx_urb_size,
388                 1 << le32_to_cpu(u.init_c->packet_alignment));
389 
390         /* module has some device initialization code needs to be done right
391          * after RNDIS_INIT */
392         if (dev->driver_info->early_init &&
393                         dev->driver_info->early_init(dev) != 0)
394                 goto halt_fail_and_release;
395 
396         /* Check physical medium */
397         phym = NULL;
398         reply_len = sizeof *phym;
399         retval = rndis_query(dev, intf, u.buf,
400                              RNDIS_OID_GEN_PHYSICAL_MEDIUM,
401                              0, (void **) &phym, &reply_len);
402         if (retval != 0 || !phym) {
403                 /* OID is optional so don't fail here. */
404                 phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
405                 phym = &phym_unspec;
406         }
407         if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
408             le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
409                 netif_dbg(dev, probe, dev->net,
410                           "driver requires wireless physical medium, but device is not\n");
411                 retval = -ENODEV;
412                 goto halt_fail_and_release;
413         }
414         if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
415             le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
416                 netif_dbg(dev, probe, dev->net,
417                           "driver requires non-wireless physical medium, but device is wireless.\n");
418                 retval = -ENODEV;
419                 goto halt_fail_and_release;
420         }
421 
422         /* Get designated host ethernet address */
423         reply_len = ETH_ALEN;
424         retval = rndis_query(dev, intf, u.buf,
425                              RNDIS_OID_802_3_PERMANENT_ADDRESS,
426                              48, (void **) &bp, &reply_len);
427         if (unlikely(retval< 0)) {
428                 dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
429                 goto halt_fail_and_release;
430         }
431         memcpy(net->dev_addr, bp, ETH_ALEN);
432 
433         /* set a nonzero filter to enable data transfers */
434         memset(u.set, 0, sizeof *u.set);
435         u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
436         u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
437         u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
438         u.set->len = cpu_to_le32(4);
439         u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
440         *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
441 
442         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
443         if (unlikely(retval < 0)) {
444                 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
445                 goto halt_fail_and_release;
446         }
447 
448         retval = 0;
449 
450         kfree(u.buf);
451         return retval;
452 
453 halt_fail_and_release:
454         memset(u.halt, 0, sizeof *u.halt);
455         u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
456         u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
457         (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
458 fail_and_release:
459         usb_set_intfdata(info->data, NULL);
460         usb_driver_release_interface(driver_of(intf), info->data);
461         info->data = NULL;
462 fail:
463         kfree(u.buf);
464         return retval;
465 }
466 EXPORT_SYMBOL_GPL(generic_rndis_bind);
467 
468 static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
469 {
470         return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
471 }
472 
473 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
474 {
475         struct rndis_halt       *halt;
476 
477         /* try to clear any rndis state/activity (no i/o from stack!) */
478         halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
479         if (halt) {
480                 halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
481                 halt->msg_len = cpu_to_le32(sizeof *halt);
482                 (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
483                 kfree(halt);
484         }
485 
486         usbnet_cdc_unbind(dev, intf);
487 }
488 EXPORT_SYMBOL_GPL(rndis_unbind);
489 
490 /*
491  * DATA -- host must not write zlps
492  */
493 int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
494 {
495         /* This check is no longer done by usbnet */
496         if (skb->len < dev->net->hard_header_len)
497                 return 0;
498 
499         /* peripheral may have batched packets to us... */
500         while (likely(skb->len)) {
501                 struct rndis_data_hdr   *hdr = (void *)skb->data;
502                 struct sk_buff          *skb2;
503                 u32                     msg_type, msg_len, data_offset, data_len;
504 
505                 msg_type = le32_to_cpu(hdr->msg_type);
506                 msg_len = le32_to_cpu(hdr->msg_len);
507                 data_offset = le32_to_cpu(hdr->data_offset);
508                 data_len = le32_to_cpu(hdr->data_len);
509 
510                 /* don't choke if we see oob, per-packet data, etc */
511                 if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
512                                 || (data_offset + data_len + 8) > msg_len)) {
513                         dev->net->stats.rx_frame_errors++;
514                         netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
515                                    le32_to_cpu(hdr->msg_type),
516                                    msg_len, data_offset, data_len, skb->len);
517                         return 0;
518                 }
519                 skb_pull(skb, 8 + data_offset);
520 
521                 /* at most one packet left? */
522                 if (likely((data_len - skb->len) <= sizeof *hdr)) {
523                         skb_trim(skb, data_len);
524                         break;
525                 }
526 
527                 /* try to return all the packets in the batch */
528                 skb2 = skb_clone(skb, GFP_ATOMIC);
529                 if (unlikely(!skb2))
530                         break;
531                 skb_pull(skb, msg_len - sizeof *hdr);
532                 skb_trim(skb2, data_len);
533                 usbnet_skb_return(dev, skb2);
534         }
535 
536         /* caller will usbnet_skb_return the remaining packet */
537         return 1;
538 }
539 EXPORT_SYMBOL_GPL(rndis_rx_fixup);
540 
541 struct sk_buff *
542 rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
543 {
544         struct rndis_data_hdr   *hdr;
545         struct sk_buff          *skb2;
546         unsigned                len = skb->len;
547 
548         if (likely(!skb_cloned(skb))) {
549                 int     room = skb_headroom(skb);
550 
551                 /* enough head room as-is? */
552                 if (unlikely((sizeof *hdr) <= room))
553                         goto fill;
554 
555                 /* enough room, but needs to be readjusted? */
556                 room += skb_tailroom(skb);
557                 if (likely((sizeof *hdr) <= room)) {
558                         skb->data = memmove(skb->head + sizeof *hdr,
559                                             skb->data, len);
560                         skb_set_tail_pointer(skb, len);
561                         goto fill;
562                 }
563         }
564 
565         /* create a new skb, with the correct size (and tailpad) */
566         skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
567         dev_kfree_skb_any(skb);
568         if (unlikely(!skb2))
569                 return skb2;
570         skb = skb2;
571 
572         /* fill out the RNDIS header.  we won't bother trying to batch
573          * packets; Linux minimizes wasted bandwidth through tx queues.
574          */
575 fill:
576         hdr = (void *) __skb_push(skb, sizeof *hdr);
577         memset(hdr, 0, sizeof *hdr);
578         hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
579         hdr->msg_len = cpu_to_le32(skb->len);
580         hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
581         hdr->data_len = cpu_to_le32(len);
582 
583         /* FIXME make the last packet always be short ... */
584         return skb;
585 }
586 EXPORT_SYMBOL_GPL(rndis_tx_fixup);
587 
588 
589 static const struct driver_info rndis_info = {
590         .description =  "RNDIS device",
591         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
592         .bind =         rndis_bind,
593         .unbind =       rndis_unbind,
594         .status =       rndis_status,
595         .rx_fixup =     rndis_rx_fixup,
596         .tx_fixup =     rndis_tx_fixup,
597 };
598 
599 static const struct driver_info rndis_poll_status_info = {
600         .description =  "RNDIS device (poll status before control)",
601         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
602         .data =         RNDIS_DRIVER_DATA_POLL_STATUS,
603         .bind =         rndis_bind,
604         .unbind =       rndis_unbind,
605         .status =       rndis_status,
606         .rx_fixup =     rndis_rx_fixup,
607         .tx_fixup =     rndis_tx_fixup,
608 };
609 
610 /*-------------------------------------------------------------------------*/
611 
612 static const struct usb_device_id       products [] = {
613 {
614         /* 2Wire HomePortal 1000SW */
615         USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
616                                       USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
617         .driver_info = (unsigned long) &rndis_poll_status_info,
618 }, {
619         /* RNDIS is MSFT's un-official variant of CDC ACM */
620         USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
621         .driver_info = (unsigned long) &rndis_info,
622 }, {
623         /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
624         USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
625         .driver_info = (unsigned long) &rndis_poll_status_info,
626 }, {
627         /* RNDIS for tethering */
628         USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
629         .driver_info = (unsigned long) &rndis_info,
630 },
631         { },            // END
632 };
633 MODULE_DEVICE_TABLE(usb, products);
634 
635 static struct usb_driver rndis_driver = {
636         .name =         "rndis_host",
637         .id_table =     products,
638         .probe =        usbnet_probe,
639         .disconnect =   usbnet_disconnect,
640         .suspend =      usbnet_suspend,
641         .resume =       usbnet_resume,
642         .disable_hub_initiated_lpm = 1,
643 };
644 
645 module_usb_driver(rndis_driver);
646 
647 MODULE_AUTHOR("David Brownell");
648 MODULE_DESCRIPTION("USB Host side RNDIS driver");
649 MODULE_LICENSE("GPL");
650 

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