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 */
rndis_status(struct usbnet * dev,struct urb * urb)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 */
rndis_msg_indicate(struct usbnet * dev,struct rndis_indicate * msg,int buflen)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 */
rndis_command(struct usbnet * dev,struct rndis_msg_hdr * buf,int buflen)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 ¬ification, 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(40);
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 */
rndis_query(struct usbnet * dev,struct usb_interface * intf,void * buf,u32 oid,u32 in_len,void ** reply,int * reply_len)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
generic_rndis_bind(struct usbnet * dev,struct usb_interface * intf,int flags)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 reply_len, (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
rndis_bind(struct usbnet * dev,struct usb_interface * intf)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
rndis_unbind(struct usbnet * dev,struct usb_interface * intf)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 */
rndis_rx_fixup(struct usbnet * dev,struct sk_buff * skb)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 *
rndis_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)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 /* Hytera Communications DMR radios' "Radio to PC Network" */
620 USB_VENDOR_AND_INTERFACE_INFO(0x238b,
621 USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
622 .driver_info = (unsigned long)&rndis_info,
623 }, {
624 /* RNDIS is MSFT's un-official variant of CDC ACM */
625 USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
626 .driver_info = (unsigned long) &rndis_info,
627 }, {
628 /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
629 USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
630 .driver_info = (unsigned long) &rndis_poll_status_info,
631 }, {
632 /* RNDIS for tethering */
633 USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
634 .driver_info = (unsigned long) &rndis_info,
635 },
636 { }, // END
637 };
638 MODULE_DEVICE_TABLE(usb, products);
639
640 static struct usb_driver rndis_driver = {
641 .name = "rndis_host",
642 .id_table = products,
643 .probe = usbnet_probe,
644 .disconnect = usbnet_disconnect,
645 .suspend = usbnet_suspend,
646 .resume = usbnet_resume,
647 .disable_hub_initiated_lpm = 1,
648 };
649
650 module_usb_driver(rndis_driver);
651
652 MODULE_AUTHOR("David Brownell");
653 MODULE_DESCRIPTION("USB Host side RNDIS driver");
654 MODULE_LICENSE("GPL");
655