1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Host Side support for RNDIS Networking Links
4 * Copyright (C) 2005 by David Brownell
5 */
6 #include <linux/module.h>
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/ethtool.h>
10 #include <linux/workqueue.h>
11 #include <linux/slab.h>
12 #include <linux/mii.h>
13 #include <linux/usb.h>
14 #include <linux/usb/cdc.h>
15 #include <linux/usb/usbnet.h>
16 #include <linux/usb/rndis_host.h>
17 #include <linux/overflow.h>
18
19
20 /*
21 * RNDIS is NDIS remoted over USB. It's a MSFT variant of CDC ACM ... of
22 * course ACM was intended for modems, not Ethernet links! USB's standard
23 * for Ethernet links is "CDC Ethernet", which is significantly simpler.
24 *
25 * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete. Issues
26 * include:
27 * - Power management in particular relies on information that's scattered
28 * through other documentation, and which is incomplete or incorrect even
29 * there.
30 * - There are various undocumented protocol requirements, such as the
31 * need to send unused garbage in control-OUT messages.
32 * - In some cases, MS-Windows will emit undocumented requests; this
33 * matters more to peripheral implementations than host ones.
34 *
35 * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
36 *
37 * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
38 * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
39 * currently rare) "Ethernet Emulation Model" (EEM).
40 */
41
42 /*
43 * RNDIS notifications from device: command completion; "reverse"
44 * keepalives; etc
45 */
rndis_status(struct usbnet * dev,struct urb * urb)46 void rndis_status(struct usbnet *dev, struct urb *urb)
47 {
48 netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
49 urb->actual_length, urb->status);
50 // FIXME for keepalives, respond immediately (asynchronously)
51 // if not an RNDIS status, do like cdc_status(dev,urb) does
52 }
53 EXPORT_SYMBOL_GPL(rndis_status);
54
55 /*
56 * RNDIS indicate messages.
57 */
rndis_msg_indicate(struct usbnet * dev,struct rndis_indicate * msg,int buflen)58 static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
59 int buflen)
60 {
61 struct cdc_state *info = (void *)&dev->data;
62 struct device *udev = &info->control->dev;
63
64 if (dev->driver_info->indication) {
65 dev->driver_info->indication(dev, msg, buflen);
66 } else {
67 u32 status = le32_to_cpu(msg->status);
68
69 switch (status) {
70 case RNDIS_STATUS_MEDIA_CONNECT:
71 dev_info(udev, "rndis media connect\n");
72 break;
73 case RNDIS_STATUS_MEDIA_DISCONNECT:
74 dev_info(udev, "rndis media disconnect\n");
75 break;
76 default:
77 dev_info(udev, "rndis indication: 0x%08x\n", status);
78 }
79 }
80 }
81
82 /*
83 * RPC done RNDIS-style. Caller guarantees:
84 * - message is properly byteswapped
85 * - there's no other request pending
86 * - buf can hold up to 1KB response (required by RNDIS spec)
87 * On return, the first few entries are already byteswapped.
88 *
89 * Call context is likely probe(), before interface name is known,
90 * which is why we won't try to use it in the diagnostics.
91 */
rndis_command(struct usbnet * dev,struct rndis_msg_hdr * buf,int buflen)92 int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
93 {
94 struct cdc_state *info = (void *) &dev->data;
95 struct usb_cdc_notification notification;
96 int master_ifnum;
97 int retval;
98 int partial;
99 unsigned count;
100 u32 xid = 0, msg_len, request_id, msg_type, rsp,
101 status;
102
103 /* REVISIT when this gets called from contexts other than probe() or
104 * disconnect(): either serialize, or dispatch responses on xid
105 */
106
107 msg_type = le32_to_cpu(buf->msg_type);
108
109 /* Issue the request; xid is unique, don't bother byteswapping it */
110 if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
111 xid = dev->xid++;
112 if (!xid)
113 xid = dev->xid++;
114 buf->request_id = (__force __le32) xid;
115 }
116 master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
117 retval = usb_control_msg(dev->udev,
118 usb_sndctrlpipe(dev->udev, 0),
119 USB_CDC_SEND_ENCAPSULATED_COMMAND,
120 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
121 0, master_ifnum,
122 buf, le32_to_cpu(buf->msg_len),
123 RNDIS_CONTROL_TIMEOUT_MS);
124 if (unlikely(retval < 0 || xid == 0))
125 return retval;
126
127 /* Some devices don't respond on the control channel until
128 * polled on the status channel, so do that first. */
129 if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
130 retval = usb_interrupt_msg(
131 dev->udev,
132 usb_rcvintpipe(dev->udev,
133 dev->status->desc.bEndpointAddress),
134 ¬ification, sizeof(notification), &partial,
135 RNDIS_CONTROL_TIMEOUT_MS);
136 if (unlikely(retval < 0))
137 return retval;
138 }
139
140 /* Poll the control channel; the request probably completed immediately */
141 rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
142 for (count = 0; count < 10; count++) {
143 memset(buf, 0, CONTROL_BUFFER_SIZE);
144 retval = usb_control_msg(dev->udev,
145 usb_rcvctrlpipe(dev->udev, 0),
146 USB_CDC_GET_ENCAPSULATED_RESPONSE,
147 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
148 0, master_ifnum,
149 buf, buflen,
150 RNDIS_CONTROL_TIMEOUT_MS);
151 if (likely(retval >= 8)) {
152 msg_type = le32_to_cpu(buf->msg_type);
153 msg_len = le32_to_cpu(buf->msg_len);
154 status = le32_to_cpu(buf->status);
155 request_id = (__force u32) buf->request_id;
156 if (likely(msg_type == rsp)) {
157 if (likely(request_id == xid)) {
158 if (unlikely(rsp == RNDIS_MSG_RESET_C))
159 return 0;
160 if (likely(RNDIS_STATUS_SUCCESS ==
161 status))
162 return 0;
163 dev_dbg(&info->control->dev,
164 "rndis reply status %08x\n",
165 status);
166 return -EL3RST;
167 }
168 dev_dbg(&info->control->dev,
169 "rndis reply id %d expected %d\n",
170 request_id, xid);
171 /* then likely retry */
172 } else switch (msg_type) {
173 case RNDIS_MSG_INDICATE: /* fault/event */
174 rndis_msg_indicate(dev, (void *)buf, buflen);
175 break;
176 case RNDIS_MSG_KEEPALIVE: { /* ping */
177 struct rndis_keepalive_c *msg = (void *)buf;
178
179 msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
180 msg->msg_len = cpu_to_le32(sizeof *msg);
181 msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
182 retval = usb_control_msg(dev->udev,
183 usb_sndctrlpipe(dev->udev, 0),
184 USB_CDC_SEND_ENCAPSULATED_COMMAND,
185 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
186 0, master_ifnum,
187 msg, sizeof *msg,
188 RNDIS_CONTROL_TIMEOUT_MS);
189 if (unlikely(retval < 0))
190 dev_dbg(&info->control->dev,
191 "rndis keepalive err %d\n",
192 retval);
193 }
194 break;
195 default:
196 dev_dbg(&info->control->dev,
197 "unexpected rndis msg %08x len %d\n",
198 le32_to_cpu(buf->msg_type), msg_len);
199 }
200 } else {
201 /* device probably issued a protocol stall; ignore */
202 dev_dbg(&info->control->dev,
203 "rndis response error, code %d\n", retval);
204 }
205 msleep(40);
206 }
207 dev_dbg(&info->control->dev, "rndis response timeout\n");
208 return -ETIMEDOUT;
209 }
210 EXPORT_SYMBOL_GPL(rndis_command);
211
212 /*
213 * rndis_query:
214 *
215 * Performs a query for @oid along with 0 or more bytes of payload as
216 * specified by @in_len. If @reply_len is not set to -1 then the reply
217 * length is checked against this value, resulting in an error if it
218 * doesn't match.
219 *
220 * NOTE: Adding a payload exactly or greater than the size of the expected
221 * response payload is an evident requirement MSFT added for ActiveSync.
222 *
223 * The only exception is for OIDs that return a variably sized response,
224 * in which case no payload should be added. This undocumented (and
225 * nonsensical!) issue was found by sniffing protocol requests from the
226 * ActiveSync 4.1 Windows driver.
227 */
rndis_query(struct usbnet * dev,struct usb_interface * intf,void * buf,u32 oid,u32 in_len,void ** reply,int * reply_len)228 static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
229 void *buf, u32 oid, u32 in_len,
230 void **reply, int *reply_len)
231 {
232 int retval;
233 union {
234 void *buf;
235 struct rndis_msg_hdr *header;
236 struct rndis_query *get;
237 struct rndis_query_c *get_c;
238 } u;
239 u32 off, len;
240
241 u.buf = buf;
242
243 memset(u.get, 0, sizeof *u.get + in_len);
244 u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
245 u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
246 u.get->oid = cpu_to_le32(oid);
247 u.get->len = cpu_to_le32(in_len);
248 u.get->offset = cpu_to_le32(20);
249
250 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
251 if (unlikely(retval < 0)) {
252 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
253 oid, retval);
254 return retval;
255 }
256
257 off = le32_to_cpu(u.get_c->offset);
258 len = le32_to_cpu(u.get_c->len);
259 if (unlikely((off > CONTROL_BUFFER_SIZE - 8) ||
260 (len > CONTROL_BUFFER_SIZE - 8 - off)))
261 goto response_error;
262
263 if (*reply_len != -1 && len != *reply_len)
264 goto response_error;
265
266 *reply = (unsigned char *) &u.get_c->request_id + off;
267 *reply_len = len;
268
269 return retval;
270
271 response_error:
272 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
273 "invalid response - off %d len %d\n",
274 oid, off, len);
275 return -EDOM;
276 }
277
278 /* same as usbnet_netdev_ops but MTU change not allowed */
279 static const struct net_device_ops rndis_netdev_ops = {
280 .ndo_open = usbnet_open,
281 .ndo_stop = usbnet_stop,
282 .ndo_start_xmit = usbnet_start_xmit,
283 .ndo_tx_timeout = usbnet_tx_timeout,
284 .ndo_get_stats64 = dev_get_tstats64,
285 .ndo_set_mac_address = eth_mac_addr,
286 .ndo_validate_addr = eth_validate_addr,
287 };
288
289 int
generic_rndis_bind(struct usbnet * dev,struct usb_interface * intf,int flags)290 generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
291 {
292 int retval;
293 struct net_device *net = dev->net;
294 struct cdc_state *info = (void *) &dev->data;
295 union {
296 void *buf;
297 struct rndis_msg_hdr *header;
298 struct rndis_init *init;
299 struct rndis_init_c *init_c;
300 struct rndis_query *get;
301 struct rndis_query_c *get_c;
302 struct rndis_set *set;
303 struct rndis_set_c *set_c;
304 struct rndis_halt *halt;
305 } u;
306 u32 tmp;
307 __le32 phym_unspec, *phym;
308 int reply_len;
309 unsigned char *bp;
310
311 /* we can't rely on i/o from stack working, or stack allocation */
312 u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
313 if (!u.buf)
314 return -ENOMEM;
315 retval = usbnet_generic_cdc_bind(dev, intf);
316 if (retval < 0)
317 goto fail;
318
319 u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
320 u.init->msg_len = cpu_to_le32(sizeof *u.init);
321 u.init->major_version = cpu_to_le32(1);
322 u.init->minor_version = cpu_to_le32(0);
323
324 /* max transfer (in spec) is 0x4000 at full speed, but for
325 * TX we'll stick to one Ethernet packet plus RNDIS framing.
326 * For RX we handle drivers that zero-pad to end-of-packet.
327 * Don't let userspace change these settings.
328 *
329 * NOTE: there still seems to be weirdness here, as if we need
330 * to do some more things to make sure WinCE targets accept this.
331 * They default to jumbograms of 8KB or 16KB, which is absurd
332 * for such low data rates and which is also more than Linux
333 * can usually expect to allocate for SKB data...
334 */
335 net->hard_header_len += sizeof (struct rndis_data_hdr);
336 dev->hard_mtu = net->mtu + net->hard_header_len;
337
338 dev->maxpacket = usb_maxpacket(dev->udev, dev->out);
339 if (dev->maxpacket == 0) {
340 netif_dbg(dev, probe, dev->net,
341 "dev->maxpacket can't be 0\n");
342 retval = -EINVAL;
343 goto fail_and_release;
344 }
345
346 dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
347 dev->rx_urb_size &= ~(dev->maxpacket - 1);
348 u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
349
350 net->netdev_ops = &rndis_netdev_ops;
351
352 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
353 if (unlikely(retval < 0)) {
354 /* it might not even be an RNDIS device!! */
355 dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
356 goto fail_and_release;
357 }
358 tmp = le32_to_cpu(u.init_c->max_transfer_size);
359 if (tmp < dev->hard_mtu) {
360 if (tmp <= net->hard_header_len) {
361 dev_err(&intf->dev,
362 "dev can't take %u byte packets (max %u)\n",
363 dev->hard_mtu, tmp);
364 retval = -EINVAL;
365 goto halt_fail_and_release;
366 }
367 dev_warn(&intf->dev,
368 "dev can't take %u byte packets (max %u), "
369 "adjusting MTU to %u\n",
370 dev->hard_mtu, tmp, tmp - net->hard_header_len);
371 dev->hard_mtu = tmp;
372 net->mtu = dev->hard_mtu - net->hard_header_len;
373 }
374
375 /* REVISIT: peripheral "alignment" request is ignored ... */
376 dev_dbg(&intf->dev,
377 "hard mtu %u (%u from dev), rx buflen %zu, align %d\n",
378 dev->hard_mtu, tmp, dev->rx_urb_size,
379 1 << le32_to_cpu(u.init_c->packet_alignment));
380
381 /* module has some device initialization code needs to be done right
382 * after RNDIS_INIT */
383 if (dev->driver_info->early_init &&
384 dev->driver_info->early_init(dev) != 0)
385 goto halt_fail_and_release;
386
387 /* Check physical medium */
388 phym = NULL;
389 reply_len = sizeof *phym;
390 retval = rndis_query(dev, intf, u.buf,
391 RNDIS_OID_GEN_PHYSICAL_MEDIUM,
392 reply_len, (void **)&phym, &reply_len);
393 if (retval != 0 || !phym) {
394 /* OID is optional so don't fail here. */
395 phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
396 phym = &phym_unspec;
397 }
398 if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
399 le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
400 netif_dbg(dev, probe, dev->net,
401 "driver requires wireless physical medium, but device is not\n");
402 retval = -ENODEV;
403 goto halt_fail_and_release;
404 }
405 if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
406 le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
407 netif_dbg(dev, probe, dev->net,
408 "driver requires non-wireless physical medium, but device is wireless.\n");
409 retval = -ENODEV;
410 goto halt_fail_and_release;
411 }
412
413 /* Get designated host ethernet address */
414 reply_len = ETH_ALEN;
415 retval = rndis_query(dev, intf, u.buf,
416 RNDIS_OID_802_3_PERMANENT_ADDRESS,
417 48, (void **) &bp, &reply_len);
418 if (unlikely(retval< 0)) {
419 dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
420 goto halt_fail_and_release;
421 }
422
423 eth_hw_addr_set(net, bp);
424
425 /* set a nonzero filter to enable data transfers */
426 memset(u.set, 0, sizeof *u.set);
427 u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
428 u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
429 u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
430 u.set->len = cpu_to_le32(4);
431 u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
432 *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
433
434 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
435 if (unlikely(retval < 0)) {
436 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
437 goto halt_fail_and_release;
438 }
439
440 retval = 0;
441
442 kfree(u.buf);
443 return retval;
444
445 halt_fail_and_release:
446 memset(u.halt, 0, sizeof *u.halt);
447 u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
448 u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
449 (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
450 fail_and_release:
451 usb_set_intfdata(info->data, NULL);
452 usb_driver_release_interface(driver_of(intf), info->data);
453 info->data = NULL;
454 fail:
455 kfree(u.buf);
456 return retval;
457 }
458 EXPORT_SYMBOL_GPL(generic_rndis_bind);
459
rndis_bind(struct usbnet * dev,struct usb_interface * intf)460 static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
461 {
462 return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
463 }
464
zte_rndis_bind(struct usbnet * dev,struct usb_interface * intf)465 static int zte_rndis_bind(struct usbnet *dev, struct usb_interface *intf)
466 {
467 int status = rndis_bind(dev, intf);
468
469 if (!status && (dev->net->dev_addr[0] & 0x02))
470 eth_hw_addr_random(dev->net);
471
472 return status;
473 }
474
rndis_unbind(struct usbnet * dev,struct usb_interface * intf)475 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
476 {
477 struct rndis_halt *halt;
478
479 /* try to clear any rndis state/activity (no i/o from stack!) */
480 halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
481 if (halt) {
482 halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
483 halt->msg_len = cpu_to_le32(sizeof *halt);
484 (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
485 kfree(halt);
486 }
487
488 usbnet_cdc_unbind(dev, intf);
489 }
490 EXPORT_SYMBOL_GPL(rndis_unbind);
491
492 /*
493 * DATA -- host must not write zlps
494 */
rndis_rx_fixup(struct usbnet * dev,struct sk_buff * skb)495 int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
496 {
497 bool dst_mac_fixup;
498
499 /* This check is no longer done by usbnet */
500 if (skb->len < dev->net->hard_header_len)
501 return 0;
502
503 dst_mac_fixup = !!(dev->driver_info->data & RNDIS_DRIVER_DATA_DST_MAC_FIXUP);
504
505 /* peripheral may have batched packets to us... */
506 while (likely(skb->len)) {
507 struct rndis_data_hdr *hdr = (void *)skb->data;
508 struct sk_buff *skb2;
509 u32 msg_type, msg_len, data_offset, data_len;
510 u32 overflow_check;
511
512 msg_type = le32_to_cpu(hdr->msg_type);
513 msg_len = le32_to_cpu(hdr->msg_len);
514 data_offset = le32_to_cpu(hdr->data_offset);
515 data_len = le32_to_cpu(hdr->data_len);
516
517 /* don't choke if we see oob, per-packet data, etc */
518 if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
519 || (data_offset + data_len + 8) > msg_len
520 || check_add_overflow(data_offset, data_len, &overflow_check)
521 || check_add_overflow(overflow_check, 8, &overflow_check))) {
522 dev->net->stats.rx_frame_errors++;
523 netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
524 le32_to_cpu(hdr->msg_type),
525 msg_len, data_offset, data_len, skb->len);
526 return 0;
527 }
528 skb_pull(skb, 8 + data_offset);
529
530 /* at most one packet left? */
531 if (likely((data_len - skb->len) <= sizeof *hdr)) {
532 skb_trim(skb, data_len);
533 break;
534 }
535
536 /* try to return all the packets in the batch */
537 skb2 = skb_clone(skb, GFP_ATOMIC);
538 if (unlikely(!skb2))
539 break;
540 skb_pull(skb, msg_len - sizeof *hdr);
541 skb_trim(skb2, data_len);
542
543 if (unlikely(dst_mac_fixup))
544 usbnet_cdc_zte_rx_fixup(dev, skb2);
545
546 usbnet_skb_return(dev, skb2);
547 }
548
549 /* caller will usbnet_skb_return the remaining packet */
550 if (unlikely(dst_mac_fixup))
551 usbnet_cdc_zte_rx_fixup(dev, skb);
552
553 return 1;
554 }
555 EXPORT_SYMBOL_GPL(rndis_rx_fixup);
556
557 struct sk_buff *
rndis_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)558 rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
559 {
560 struct rndis_data_hdr *hdr;
561 struct sk_buff *skb2;
562 unsigned len = skb->len;
563
564 if (likely(!skb_cloned(skb))) {
565 int room = skb_headroom(skb);
566
567 /* enough head room as-is? */
568 if (unlikely((sizeof *hdr) <= room))
569 goto fill;
570
571 /* enough room, but needs to be readjusted? */
572 room += skb_tailroom(skb);
573 if (likely((sizeof *hdr) <= room)) {
574 skb->data = memmove(skb->head + sizeof *hdr,
575 skb->data, len);
576 skb_set_tail_pointer(skb, len);
577 goto fill;
578 }
579 }
580
581 /* create a new skb, with the correct size (and tailpad) */
582 skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
583 dev_kfree_skb_any(skb);
584 if (unlikely(!skb2))
585 return skb2;
586 skb = skb2;
587
588 /* fill out the RNDIS header. we won't bother trying to batch
589 * packets; Linux minimizes wasted bandwidth through tx queues.
590 */
591 fill:
592 hdr = __skb_push(skb, sizeof *hdr);
593 memset(hdr, 0, sizeof *hdr);
594 hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
595 hdr->msg_len = cpu_to_le32(skb->len);
596 hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
597 hdr->data_len = cpu_to_le32(len);
598
599 /* FIXME make the last packet always be short ... */
600 return skb;
601 }
602 EXPORT_SYMBOL_GPL(rndis_tx_fixup);
603
604
605 static const struct driver_info rndis_info = {
606 .description = "RNDIS device",
607 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
608 .bind = rndis_bind,
609 .unbind = rndis_unbind,
610 .status = rndis_status,
611 .rx_fixup = rndis_rx_fixup,
612 .tx_fixup = rndis_tx_fixup,
613 };
614
615 static const struct driver_info rndis_poll_status_info = {
616 .description = "RNDIS device (poll status before control)",
617 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
618 .data = RNDIS_DRIVER_DATA_POLL_STATUS,
619 .bind = rndis_bind,
620 .unbind = rndis_unbind,
621 .status = rndis_status,
622 .rx_fixup = rndis_rx_fixup,
623 .tx_fixup = rndis_tx_fixup,
624 };
625
626 static const struct driver_info zte_rndis_info = {
627 .description = "ZTE RNDIS device",
628 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
629 .data = RNDIS_DRIVER_DATA_DST_MAC_FIXUP,
630 .bind = zte_rndis_bind,
631 .unbind = rndis_unbind,
632 .status = rndis_status,
633 .rx_fixup = rndis_rx_fixup,
634 .tx_fixup = rndis_tx_fixup,
635 };
636
637 static const struct driver_info rndis_info_lowpower = {
638 .description = "RNDIS device",
639 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
640 .bind = rndis_bind,
641 .unbind = rndis_unbind,
642 .status = rndis_status,
643 .rx_fixup = rndis_rx_fixup,
644 .tx_fixup = rndis_tx_fixup,
645 .manage_power = usbnet_manage_power,
646 };
647
648 /*-------------------------------------------------------------------------*/
649
650 static const struct usb_device_id products [] = {
651 {
652 /* 2Wire HomePortal 1000SW */
653 USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
654 USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
655 .driver_info = (unsigned long) &rndis_poll_status_info,
656 }, {
657 /* Hytera Communications DMR radios' "Radio to PC Network" */
658 USB_VENDOR_AND_INTERFACE_INFO(0x238b,
659 USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
660 .driver_info = (unsigned long)&rndis_info,
661 }, {
662 /* ZTE WWAN modules */
663 USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
664 USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
665 .driver_info = (unsigned long)&zte_rndis_info,
666 }, {
667 /* ZTE WWAN modules, ACM flavour */
668 USB_VENDOR_AND_INTERFACE_INFO(0x19d2,
669 USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
670 .driver_info = (unsigned long)&zte_rndis_info,
671 }, {
672 /* RNDIS is MSFT's un-official variant of CDC ACM */
673 USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
674 .driver_info = (unsigned long) &rndis_info,
675 }, {
676 /* Telit Cinterion LE310X1 RNDIS */
677 USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x7030,
678 USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
679 .driver_info = (unsigned long)&rndis_info_lowpower,
680 }, {
681 /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
682 USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
683 .driver_info = (unsigned long) &rndis_poll_status_info,
684 }, {
685 /* RNDIS for tethering */
686 USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
687 .driver_info = (unsigned long) &rndis_info,
688 }, {
689 /* Novatel Verizon USB730L */
690 USB_INTERFACE_INFO(USB_CLASS_MISC, 4, 1),
691 .driver_info = (unsigned long) &rndis_info,
692 },
693 { }, // END
694 };
695 MODULE_DEVICE_TABLE(usb, products);
696
697 static struct usb_driver rndis_driver = {
698 .name = "rndis_host",
699 .id_table = products,
700 .probe = usbnet_probe,
701 .disconnect = usbnet_disconnect,
702 .suspend = usbnet_suspend,
703 .resume = usbnet_resume,
704 .disable_hub_initiated_lpm = 1,
705 };
706
707 module_usb_driver(rndis_driver);
708
709 MODULE_AUTHOR("David Brownell");
710 MODULE_DESCRIPTION("USB Host side RNDIS driver");
711 MODULE_LICENSE("GPL");
712