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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>
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57void 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
62
63}
64EXPORT_SYMBOL_GPL(rndis_status);
65
66
67
68
69static 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
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95
96
97
98
99
100
101
102
103int 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
115
116
117
118 msg_type = le32_to_cpu(buf->msg_type);
119
120
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
139
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
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
183 } else switch (msg_type) {
184 case RNDIS_MSG_INDICATE:
185 rndis_msg_indicate(dev, (void *)buf, buflen);
186 break;
187 case RNDIS_MSG_KEEPALIVE: {
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
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}
221EXPORT_SYMBOL_GPL(rndis_command);
222
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237
238
239static 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
281response_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
289static 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
298int
299generic_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
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
334
335
336
337
338
339
340
341
342
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
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
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
391
392 if (dev->driver_info->early_init &&
393 dev->driver_info->early_init(dev) != 0)
394 goto halt_fail_and_release;
395
396
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
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
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
432 if (bp[0] & 0x02)
433 eth_hw_addr_random(net);
434 else
435 ether_addr_copy(net->dev_addr, bp);
436
437
438 memset(u.set, 0, sizeof *u.set);
439 u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
440 u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
441 u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
442 u.set->len = cpu_to_le32(4);
443 u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
444 *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
445
446 retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
447 if (unlikely(retval < 0)) {
448 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
449 goto halt_fail_and_release;
450 }
451
452 retval = 0;
453
454 kfree(u.buf);
455 return retval;
456
457halt_fail_and_release:
458 memset(u.halt, 0, sizeof *u.halt);
459 u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
460 u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
461 (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
462fail_and_release:
463 usb_set_intfdata(info->data, NULL);
464 usb_driver_release_interface(driver_of(intf), info->data);
465 info->data = NULL;
466fail:
467 kfree(u.buf);
468 return retval;
469}
470EXPORT_SYMBOL_GPL(generic_rndis_bind);
471
472static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
473{
474 return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
475}
476
477void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
478{
479 struct rndis_halt *halt;
480
481
482 halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
483 if (halt) {
484 halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
485 halt->msg_len = cpu_to_le32(sizeof *halt);
486 (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
487 kfree(halt);
488 }
489
490 usbnet_cdc_unbind(dev, intf);
491}
492EXPORT_SYMBOL_GPL(rndis_unbind);
493
494
495
496
497int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
498{
499
500 if (skb->len < dev->net->hard_header_len)
501 return 0;
502
503
504 while (likely(skb->len)) {
505 struct rndis_data_hdr *hdr = (void *)skb->data;
506 struct sk_buff *skb2;
507 u32 msg_type, msg_len, data_offset, data_len;
508
509 msg_type = le32_to_cpu(hdr->msg_type);
510 msg_len = le32_to_cpu(hdr->msg_len);
511 data_offset = le32_to_cpu(hdr->data_offset);
512 data_len = le32_to_cpu(hdr->data_len);
513
514
515 if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
516 || (data_offset + data_len + 8) > msg_len)) {
517 dev->net->stats.rx_frame_errors++;
518 netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
519 le32_to_cpu(hdr->msg_type),
520 msg_len, data_offset, data_len, skb->len);
521 return 0;
522 }
523 skb_pull(skb, 8 + data_offset);
524
525
526 if (likely((data_len - skb->len) <= sizeof *hdr)) {
527 skb_trim(skb, data_len);
528 break;
529 }
530
531
532 skb2 = skb_clone(skb, GFP_ATOMIC);
533 if (unlikely(!skb2))
534 break;
535 skb_pull(skb, msg_len - sizeof *hdr);
536 skb_trim(skb2, data_len);
537 usbnet_skb_return(dev, skb2);
538 }
539
540
541 return 1;
542}
543EXPORT_SYMBOL_GPL(rndis_rx_fixup);
544
545struct sk_buff *
546rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
547{
548 struct rndis_data_hdr *hdr;
549 struct sk_buff *skb2;
550 unsigned len = skb->len;
551
552 if (likely(!skb_cloned(skb))) {
553 int room = skb_headroom(skb);
554
555
556 if (unlikely((sizeof *hdr) <= room))
557 goto fill;
558
559
560 room += skb_tailroom(skb);
561 if (likely((sizeof *hdr) <= room)) {
562 skb->data = memmove(skb->head + sizeof *hdr,
563 skb->data, len);
564 skb_set_tail_pointer(skb, len);
565 goto fill;
566 }
567 }
568
569
570 skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
571 dev_kfree_skb_any(skb);
572 if (unlikely(!skb2))
573 return skb2;
574 skb = skb2;
575
576
577
578
579fill:
580 hdr = (void *) __skb_push(skb, sizeof *hdr);
581 memset(hdr, 0, sizeof *hdr);
582 hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
583 hdr->msg_len = cpu_to_le32(skb->len);
584 hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
585 hdr->data_len = cpu_to_le32(len);
586
587
588 return skb;
589}
590EXPORT_SYMBOL_GPL(rndis_tx_fixup);
591
592
593static const struct driver_info rndis_info = {
594 .description = "RNDIS device",
595 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
596 .bind = rndis_bind,
597 .unbind = rndis_unbind,
598 .status = rndis_status,
599 .rx_fixup = rndis_rx_fixup,
600 .tx_fixup = rndis_tx_fixup,
601};
602
603static const struct driver_info rndis_poll_status_info = {
604 .description = "RNDIS device (poll status before control)",
605 .flags = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
606 .data = RNDIS_DRIVER_DATA_POLL_STATUS,
607 .bind = rndis_bind,
608 .unbind = rndis_unbind,
609 .status = rndis_status,
610 .rx_fixup = rndis_rx_fixup,
611 .tx_fixup = rndis_tx_fixup,
612};
613
614
615
616static const struct usb_device_id products [] = {
617{
618
619 USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
620 USB_CLASS_COMM, 2 , 0x0ff),
621 .driver_info = (unsigned long) &rndis_poll_status_info,
622}, {
623
624 USB_INTERFACE_INFO(USB_CLASS_COMM, 2 , 0x0ff),
625 .driver_info = (unsigned long) &rndis_info,
626}, {
627
628 USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
629 .driver_info = (unsigned long) &rndis_poll_status_info,
630}, {
631
632 USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
633 .driver_info = (unsigned long) &rndis_info,
634},
635 { },
636};
637MODULE_DEVICE_TABLE(usb, products);
638
639static struct usb_driver rndis_driver = {
640 .name = "rndis_host",
641 .id_table = products,
642 .probe = usbnet_probe,
643 .disconnect = usbnet_disconnect,
644 .suspend = usbnet_suspend,
645 .resume = usbnet_resume,
646 .disable_hub_initiated_lpm = 1,
647};
648
649module_usb_driver(rndis_driver);
650
651MODULE_AUTHOR("David Brownell");
652MODULE_DESCRIPTION("USB Host side RNDIS driver");
653MODULE_LICENSE("GPL");
654