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19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/netdevice.h>
22#include <linux/etherdevice.h>
23#include <linux/ethtool.h>
24#include <linux/workqueue.h>
25#include <linux/slab.h>
26#include <linux/mii.h>
27#include <linux/usb.h>
28#include <linux/usb/cdc.h>
29#include <linux/usb/usbnet.h>
30#include <linux/usb/rndis_host.h>
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59void rndis_status(struct usbnet *dev, struct urb *urb)
60{
61 netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
62 urb->actual_length, urb->status);
63
64
65}
66EXPORT_SYMBOL_GPL(rndis_status);
67
68
69
70
71static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
72 int buflen)
73{
74 struct cdc_state *info = (void *)&dev->data;
75 struct device *udev = &info->control->dev;
76
77 if (dev->driver_info->indication) {
78 dev->driver_info->indication(dev, msg, buflen);
79 } else {
80 switch (msg->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",
89 le32_to_cpu(msg->status));
90 }
91 }
92}
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101
102
103
104int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
105{
106 struct cdc_state *info = (void *) &dev->data;
107 int master_ifnum;
108 int retval;
109 unsigned count;
110 __le32 rsp;
111 u32 xid = 0, msg_len, request_id;
112
113
114
115
116
117
118 if (likely(buf->msg_type != RNDIS_MSG_HALT &&
119 buf->msg_type != RNDIS_MSG_RESET)) {
120 xid = dev->xid++;
121 if (!xid)
122 xid = dev->xid++;
123 buf->request_id = (__force __le32) xid;
124 }
125 master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
126 retval = usb_control_msg(dev->udev,
127 usb_sndctrlpipe(dev->udev, 0),
128 USB_CDC_SEND_ENCAPSULATED_COMMAND,
129 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
130 0, master_ifnum,
131 buf, le32_to_cpu(buf->msg_len),
132 RNDIS_CONTROL_TIMEOUT_MS);
133 if (unlikely(retval < 0 || xid == 0))
134 return retval;
135
136
137
138
139
140
141
142
143 rsp = buf->msg_type | RNDIS_MSG_COMPLETION;
144 for (count = 0; count < 10; count++) {
145 memset(buf, 0, CONTROL_BUFFER_SIZE);
146 retval = usb_control_msg(dev->udev,
147 usb_rcvctrlpipe(dev->udev, 0),
148 USB_CDC_GET_ENCAPSULATED_RESPONSE,
149 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
150 0, master_ifnum,
151 buf, buflen,
152 RNDIS_CONTROL_TIMEOUT_MS);
153 if (likely(retval >= 8)) {
154 msg_len = le32_to_cpu(buf->msg_len);
155 request_id = (__force u32) buf->request_id;
156 if (likely(buf->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 == buf->status))
162 return 0;
163 dev_dbg(&info->control->dev,
164 "rndis reply status %08x\n",
165 le32_to_cpu(buf->status));
166 return -EL3RST;
167 }
168 dev_dbg(&info->control->dev,
169 "rndis reply id %d expected %d\n",
170 request_id, xid);
171
172 } else switch (buf->msg_type) {
173 case RNDIS_MSG_INDICATE:
174 rndis_msg_indicate(dev, (void *)buf, buflen);
175
176 break;
177 case RNDIS_MSG_KEEPALIVE: {
178 struct rndis_keepalive_c *msg = (void *)buf;
179
180 msg->msg_type = RNDIS_MSG_KEEPALIVE_C;
181 msg->msg_len = cpu_to_le32(sizeof *msg);
182 msg->status = RNDIS_STATUS_SUCCESS;
183 retval = usb_control_msg(dev->udev,
184 usb_sndctrlpipe(dev->udev, 0),
185 USB_CDC_SEND_ENCAPSULATED_COMMAND,
186 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
187 0, master_ifnum,
188 msg, sizeof *msg,
189 RNDIS_CONTROL_TIMEOUT_MS);
190 if (unlikely(retval < 0))
191 dev_dbg(&info->control->dev,
192 "rndis keepalive err %d\n",
193 retval);
194 }
195 break;
196 default:
197 dev_dbg(&info->control->dev,
198 "unexpected rndis msg %08x len %d\n",
199 le32_to_cpu(buf->msg_type), msg_len);
200 }
201 } else {
202
203 dev_dbg(&info->control->dev,
204 "rndis response error, code %d\n", retval);
205 }
206 msleep(20);
207 }
208 dev_dbg(&info->control->dev, "rndis response timeout\n");
209 return -ETIMEDOUT;
210}
211EXPORT_SYMBOL_GPL(rndis_command);
212
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227
228
229static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
230 void *buf, __le32 oid, u32 in_len,
231 void **reply, int *reply_len)
232{
233 int retval;
234 union {
235 void *buf;
236 struct rndis_msg_hdr *header;
237 struct rndis_query *get;
238 struct rndis_query_c *get_c;
239 } u;
240 u32 off, len;
241
242 u.buf = buf;
243
244 memset(u.get, 0, sizeof *u.get + in_len);
245 u.get->msg_type = RNDIS_MSG_QUERY;
246 u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
247 u.get->oid = oid;
248 u.get->len = cpu_to_le32(in_len);
249 u.get->offset = cpu_to_le32(20);
250
251 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
252 if (unlikely(retval < 0)) {
253 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
254 oid, retval);
255 return retval;
256 }
257
258 off = le32_to_cpu(u.get_c->offset);
259 len = le32_to_cpu(u.get_c->len);
260 if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
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
271response_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
279static 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_set_mac_address = eth_mac_addr,
285 .ndo_validate_addr = eth_validate_addr,
286};
287
288int
289generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
290{
291 int retval;
292 struct net_device *net = dev->net;
293 struct cdc_state *info = (void *) &dev->data;
294 union {
295 void *buf;
296 struct rndis_msg_hdr *header;
297 struct rndis_init *init;
298 struct rndis_init_c *init_c;
299 struct rndis_query *get;
300 struct rndis_query_c *get_c;
301 struct rndis_set *set;
302 struct rndis_set_c *set_c;
303 struct rndis_halt *halt;
304 } u;
305 u32 tmp;
306 __le32 phym_unspec, *phym;
307 int reply_len;
308 unsigned char *bp;
309
310
311 u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
312 if (!u.buf)
313 return -ENOMEM;
314 retval = usbnet_generic_cdc_bind(dev, intf);
315 if (retval < 0)
316 goto fail;
317
318 u.init->msg_type = RNDIS_MSG_INIT;
319 u.init->msg_len = cpu_to_le32(sizeof *u.init);
320 u.init->major_version = cpu_to_le32(1);
321 u.init->minor_version = cpu_to_le32(0);
322
323
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327
328
329
330
331
332
333
334 net->hard_header_len += sizeof (struct rndis_data_hdr);
335 dev->hard_mtu = net->mtu + net->hard_header_len;
336
337 dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
338 if (dev->maxpacket == 0) {
339 netif_dbg(dev, probe, dev->net,
340 "dev->maxpacket can't be 0\n");
341 retval = -EINVAL;
342 goto fail_and_release;
343 }
344
345 dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
346 dev->rx_urb_size &= ~(dev->maxpacket - 1);
347 u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
348
349 net->netdev_ops = &rndis_netdev_ops;
350
351 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
352 if (unlikely(retval < 0)) {
353
354 dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
355 goto fail_and_release;
356 }
357 tmp = le32_to_cpu(u.init_c->max_transfer_size);
358 if (tmp < dev->hard_mtu) {
359 if (tmp <= net->hard_header_len) {
360 dev_err(&intf->dev,
361 "dev can't take %u byte packets (max %u)\n",
362 dev->hard_mtu, tmp);
363 retval = -EINVAL;
364 goto halt_fail_and_release;
365 }
366 dev_warn(&intf->dev,
367 "dev can't take %u byte packets (max %u), "
368 "adjusting MTU to %u\n",
369 dev->hard_mtu, tmp, tmp - net->hard_header_len);
370 dev->hard_mtu = tmp;
371 net->mtu = dev->hard_mtu - net->hard_header_len;
372 }
373
374
375 dev_dbg(&intf->dev,
376 "hard mtu %u (%u from dev), rx buflen %Zu, align %d\n",
377 dev->hard_mtu, tmp, dev->rx_urb_size,
378 1 << le32_to_cpu(u.init_c->packet_alignment));
379
380
381
382 if (dev->driver_info->early_init &&
383 dev->driver_info->early_init(dev) != 0)
384 goto halt_fail_and_release;
385
386
387 phym = NULL;
388 reply_len = sizeof *phym;
389 retval = rndis_query(dev, intf, u.buf, OID_GEN_PHYSICAL_MEDIUM,
390 0, (void **) &phym, &reply_len);
391 if (retval != 0 || !phym) {
392
393 phym_unspec = RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED;
394 phym = &phym_unspec;
395 }
396 if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
397 *phym != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
398 netif_dbg(dev, probe, dev->net,
399 "driver requires wireless physical medium, but device is not\n");
400 retval = -ENODEV;
401 goto halt_fail_and_release;
402 }
403 if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
404 *phym == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
405 netif_dbg(dev, probe, dev->net,
406 "driver requires non-wireless physical medium, but device is wireless.\n");
407 retval = -ENODEV;
408 goto halt_fail_and_release;
409 }
410
411
412 reply_len = ETH_ALEN;
413 retval = rndis_query(dev, intf, u.buf, OID_802_3_PERMANENT_ADDRESS,
414 48, (void **) &bp, &reply_len);
415 if (unlikely(retval< 0)) {
416 dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
417 goto halt_fail_and_release;
418 }
419 memcpy(net->dev_addr, bp, ETH_ALEN);
420 memcpy(net->perm_addr, bp, ETH_ALEN);
421
422
423 memset(u.set, 0, sizeof *u.set);
424 u.set->msg_type = RNDIS_MSG_SET;
425 u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
426 u.set->oid = OID_GEN_CURRENT_PACKET_FILTER;
427 u.set->len = cpu_to_le32(4);
428 u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
429 *(__le32 *)(u.buf + sizeof *u.set) = RNDIS_DEFAULT_FILTER;
430
431 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
432 if (unlikely(retval < 0)) {
433 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
434 goto halt_fail_and_release;
435 }
436
437 retval = 0;
438
439 kfree(u.buf);
440 return retval;
441
442halt_fail_and_release:
443 memset(u.halt, 0, sizeof *u.halt);
444 u.halt->msg_type = RNDIS_MSG_HALT;
445 u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
446 (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
447fail_and_release:
448 usb_set_intfdata(info->data, NULL);
449 usb_driver_release_interface(driver_of(intf), info->data);
450 info->data = NULL;
451fail:
452 kfree(u.buf);
453 return retval;
454}
455EXPORT_SYMBOL_GPL(generic_rndis_bind);
456
457static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
458{
459 return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
460}
461
462void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
463{
464 struct rndis_halt *halt;
465
466
467 halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
468 if (halt) {
469 halt->msg_type = RNDIS_MSG_HALT;
470 halt->msg_len = cpu_to_le32(sizeof *halt);
471 (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
472 kfree(halt);
473 }
474
475 usbnet_cdc_unbind(dev, intf);
476}
477EXPORT_SYMBOL_GPL(rndis_unbind);
478
479
480
481
482int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
483{
484
485 while (likely(skb->len)) {
486 struct rndis_data_hdr *hdr = (void *)skb->data;
487 struct sk_buff *skb2;
488 u32 msg_len, data_offset, data_len;
489
490 msg_len = le32_to_cpu(hdr->msg_len);
491 data_offset = le32_to_cpu(hdr->data_offset);
492 data_len = le32_to_cpu(hdr->data_len);
493
494
495 if (unlikely(hdr->msg_type != RNDIS_MSG_PACKET ||
496 skb->len < msg_len ||
497 (data_offset + data_len + 8) > msg_len)) {
498 dev->net->stats.rx_frame_errors++;
499 netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
500 le32_to_cpu(hdr->msg_type),
501 msg_len, data_offset, data_len, skb->len);
502 return 0;
503 }
504 skb_pull(skb, 8 + data_offset);
505
506
507 if (likely((data_len - skb->len) <= sizeof *hdr)) {
508 skb_trim(skb, data_len);
509 break;
510 }
511
512
513 skb2 = skb_clone(skb, GFP_ATOMIC);
514 if (unlikely(!skb2))
515 break;
516 skb_pull(skb, msg_len - sizeof *hdr);
517 skb_trim(skb2, data_len);
518 usbnet_skb_return(dev, skb2);
519 }
520
521
522 return 1;
523}
524EXPORT_SYMBOL_GPL(rndis_rx_fixup);
525
526struct sk_buff *
527rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
528{
529 struct rndis_data_hdr *hdr;
530 struct sk_buff *skb2;
531 unsigned len = skb->len;
532
533 if (likely(!skb_cloned(skb))) {
534 int room = skb_headroom(skb);
535
536
537 if (unlikely((sizeof *hdr) <= room))
538 goto fill;
539
540
541 room += skb_tailroom(skb);
542 if (likely((sizeof *hdr) <= room)) {
543 skb->data = memmove(skb->head + sizeof *hdr,
544 skb->data, len);
545 skb_set_tail_pointer(skb, len);
546 goto fill;
547 }
548 }
549
550
551 skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
552 dev_kfree_skb_any(skb);
553 if (unlikely(!skb2))
554 return skb2;
555 skb = skb2;
556
557
558
559
560fill:
561 hdr = (void *) __skb_push(skb, sizeof *hdr);
562 memset(hdr, 0, sizeof *hdr);
563 hdr->msg_type = RNDIS_MSG_PACKET;
564 hdr->msg_len = cpu_to_le32(skb->len);
565 hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
566 hdr->data_len = cpu_to_le32(len);
567
568
569 return skb;
570}
571EXPORT_SYMBOL_GPL(rndis_tx_fixup);
572
573
574static const struct driver_info rndis_info = {
575 .description = "RNDIS device",
576 .flags = FLAG_ETHER | FLAG_FRAMING_RN | FLAG_NO_SETINT,
577 .bind = rndis_bind,
578 .unbind = rndis_unbind,
579 .status = rndis_status,
580 .rx_fixup = rndis_rx_fixup,
581 .tx_fixup = rndis_tx_fixup,
582};
583
584
585
586static const struct usb_device_id products [] = {
587{
588
589 USB_INTERFACE_INFO(USB_CLASS_COMM, 2 , 0x0ff),
590 .driver_info = (unsigned long) &rndis_info,
591}, {
592
593 USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
594 .driver_info = (unsigned long) &rndis_info,
595}, {
596
597 USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
598 .driver_info = (unsigned long) &rndis_info,
599},
600 { },
601};
602MODULE_DEVICE_TABLE(usb, products);
603
604static struct usb_driver rndis_driver = {
605 .name = "rndis_host",
606 .id_table = products,
607 .probe = usbnet_probe,
608 .disconnect = usbnet_disconnect,
609 .suspend = usbnet_suspend,
610 .resume = usbnet_resume,
611};
612
613static int __init rndis_init(void)
614{
615 return usb_register(&rndis_driver);
616}
617module_init(rndis_init);
618
619static void __exit rndis_exit(void)
620{
621 usb_deregister(&rndis_driver);
622}
623module_exit(rndis_exit);
624
625MODULE_AUTHOR("David Brownell");
626MODULE_DESCRIPTION("USB Host side RNDIS driver");
627MODULE_LICENSE("GPL");
628