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4d7b5c7f TH |
1 | /* |
2 | * Copyright (C) 2003-2008 Takahiro Hirofuchi | |
3 | * | |
4 | * This is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
17 | * USA. | |
18 | */ | |
19 | ||
7aaacb43 | 20 | #include <asm/byteorder.h> |
9720b4bc | 21 | #include <linux/kthread.h> |
7aaacb43 | 22 | #include <linux/usb.h> |
23 | #include <linux/usb/hcd.h> | |
5a0e3ad6 | 24 | |
4d7b5c7f TH |
25 | #include "usbip_common.h" |
26 | #include "stub.h" | |
4d7b5c7f | 27 | |
4d7b5c7f TH |
28 | static int is_clear_halt_cmd(struct urb *urb) |
29 | { | |
30 | struct usb_ctrlrequest *req; | |
31 | ||
32 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
33 | ||
34 | return (req->bRequest == USB_REQ_CLEAR_FEATURE) && | |
35 | (req->bRequestType == USB_RECIP_ENDPOINT) && | |
36 | (req->wValue == USB_ENDPOINT_HALT); | |
37 | } | |
38 | ||
39 | static int is_set_interface_cmd(struct urb *urb) | |
40 | { | |
41 | struct usb_ctrlrequest *req; | |
42 | ||
43 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
44 | ||
45 | return (req->bRequest == USB_REQ_SET_INTERFACE) && | |
64f338ed | 46 | (req->bRequestType == USB_RECIP_INTERFACE); |
4d7b5c7f TH |
47 | } |
48 | ||
49 | static int is_set_configuration_cmd(struct urb *urb) | |
50 | { | |
51 | struct usb_ctrlrequest *req; | |
52 | ||
53 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
54 | ||
55 | return (req->bRequest == USB_REQ_SET_CONFIGURATION) && | |
64f338ed | 56 | (req->bRequestType == USB_RECIP_DEVICE); |
4d7b5c7f TH |
57 | } |
58 | ||
59 | static int is_reset_device_cmd(struct urb *urb) | |
60 | { | |
61 | struct usb_ctrlrequest *req; | |
62 | __u16 value; | |
63 | __u16 index; | |
64 | ||
65 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
66 | value = le16_to_cpu(req->wValue); | |
67 | index = le16_to_cpu(req->wIndex); | |
68 | ||
69 | if ((req->bRequest == USB_REQ_SET_FEATURE) && | |
64f338ed | 70 | (req->bRequestType == USB_RT_PORT) && |
71 | (value == USB_PORT_FEAT_RESET)) { | |
b8868e45 | 72 | usbip_dbg_stub_rx("reset_device_cmd, port %u\n", index); |
4d7b5c7f TH |
73 | return 1; |
74 | } else | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static int tweak_clear_halt_cmd(struct urb *urb) | |
79 | { | |
80 | struct usb_ctrlrequest *req; | |
81 | int target_endp; | |
82 | int target_dir; | |
83 | int target_pipe; | |
84 | int ret; | |
85 | ||
86 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
87 | ||
88 | /* | |
89 | * The stalled endpoint is specified in the wIndex value. The endpoint | |
90 | * of the urb is the target of this clear_halt request (i.e., control | |
91 | * endpoint). | |
92 | */ | |
93 | target_endp = le16_to_cpu(req->wIndex) & 0x000f; | |
94 | ||
95 | /* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80. */ | |
96 | target_dir = le16_to_cpu(req->wIndex) & 0x0080; | |
97 | ||
98 | if (target_dir) | |
99 | target_pipe = usb_rcvctrlpipe(urb->dev, target_endp); | |
100 | else | |
101 | target_pipe = usb_sndctrlpipe(urb->dev, target_endp); | |
102 | ||
103 | ret = usb_clear_halt(urb->dev, target_pipe); | |
104 | if (ret < 0) | |
5fb4471e HS |
105 | dev_err(&urb->dev->dev, |
106 | "usb_clear_halt error: devnum %d endp %d ret %d\n", | |
107 | urb->dev->devnum, target_endp, ret); | |
4d7b5c7f | 108 | else |
5fb4471e HS |
109 | dev_info(&urb->dev->dev, |
110 | "usb_clear_halt done: devnum %d endp %d\n", | |
111 | urb->dev->devnum, target_endp); | |
4d7b5c7f TH |
112 | |
113 | return ret; | |
114 | } | |
115 | ||
116 | static int tweak_set_interface_cmd(struct urb *urb) | |
117 | { | |
118 | struct usb_ctrlrequest *req; | |
119 | __u16 alternate; | |
120 | __u16 interface; | |
121 | int ret; | |
122 | ||
123 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
124 | alternate = le16_to_cpu(req->wValue); | |
125 | interface = le16_to_cpu(req->wIndex); | |
126 | ||
64f338ed | 127 | usbip_dbg_stub_rx("set_interface: inf %u alt %u\n", |
128 | interface, alternate); | |
4d7b5c7f TH |
129 | |
130 | ret = usb_set_interface(urb->dev, interface, alternate); | |
131 | if (ret < 0) | |
5fb4471e HS |
132 | dev_err(&urb->dev->dev, |
133 | "usb_set_interface error: inf %u alt %u ret %d\n", | |
134 | interface, alternate, ret); | |
4d7b5c7f | 135 | else |
5fb4471e HS |
136 | dev_info(&urb->dev->dev, |
137 | "usb_set_interface done: inf %u alt %u\n", | |
138 | interface, alternate); | |
4d7b5c7f TH |
139 | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static int tweak_set_configuration_cmd(struct urb *urb) | |
144 | { | |
2c8c9815 VM |
145 | struct stub_priv *priv = (struct stub_priv *) urb->context; |
146 | struct stub_device *sdev = priv->sdev; | |
4d7b5c7f TH |
147 | struct usb_ctrlrequest *req; |
148 | __u16 config; | |
2c8c9815 | 149 | int err; |
4d7b5c7f TH |
150 | |
151 | req = (struct usb_ctrlrequest *) urb->setup_packet; | |
152 | config = le16_to_cpu(req->wValue); | |
153 | ||
2c8c9815 VM |
154 | err = usb_set_configuration(sdev->udev, config); |
155 | if (err && err != -ENODEV) | |
156 | dev_err(&sdev->udev->dev, "can't set config #%d, error %d\n", | |
157 | config, err); | |
4d7b5c7f | 158 | return 0; |
4d7b5c7f TH |
159 | } |
160 | ||
161 | static int tweak_reset_device_cmd(struct urb *urb) | |
162 | { | |
d2dd0b07 AM |
163 | struct stub_priv *priv = (struct stub_priv *) urb->context; |
164 | struct stub_device *sdev = priv->sdev; | |
4d7b5c7f | 165 | |
1a4b6f66 | 166 | dev_info(&urb->dev->dev, "usb_queue_reset_device\n"); |
4d7b5c7f | 167 | |
8c7003a3 | 168 | if (usb_lock_device_for_reset(sdev->udev, NULL) < 0) { |
d3ac0778 AM |
169 | dev_err(&urb->dev->dev, "could not obtain lock to reset device\n"); |
170 | return 0; | |
171 | } | |
172 | usb_reset_device(sdev->udev); | |
173 | usb_unlock_device(sdev->udev); | |
174 | ||
d2dd0b07 | 175 | return 0; |
4d7b5c7f TH |
176 | } |
177 | ||
178 | /* | |
179 | * clear_halt, set_interface, and set_configuration require special tricks. | |
180 | */ | |
181 | static void tweak_special_requests(struct urb *urb) | |
182 | { | |
183 | if (!urb || !urb->setup_packet) | |
184 | return; | |
185 | ||
186 | if (usb_pipetype(urb->pipe) != PIPE_CONTROL) | |
187 | return; | |
188 | ||
189 | if (is_clear_halt_cmd(urb)) | |
190 | /* tweak clear_halt */ | |
191 | tweak_clear_halt_cmd(urb); | |
192 | ||
193 | else if (is_set_interface_cmd(urb)) | |
194 | /* tweak set_interface */ | |
195 | tweak_set_interface_cmd(urb); | |
196 | ||
197 | else if (is_set_configuration_cmd(urb)) | |
198 | /* tweak set_configuration */ | |
199 | tweak_set_configuration_cmd(urb); | |
200 | ||
201 | else if (is_reset_device_cmd(urb)) | |
202 | tweak_reset_device_cmd(urb); | |
203 | else | |
b8868e45 | 204 | usbip_dbg_stub_rx("no need to tweak\n"); |
4d7b5c7f TH |
205 | } |
206 | ||
207 | /* | |
208 | * stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb(). | |
209 | * By unlinking the urb asynchronously, stub_rx can continuously | |
210 | * process coming urbs. Even if the urb is unlinked, its completion | |
211 | * handler will be called and stub_tx will send a return pdu. | |
212 | * | |
213 | * See also comments about unlinking strategy in vhci_hcd.c. | |
214 | */ | |
215 | static int stub_recv_cmd_unlink(struct stub_device *sdev, | |
64f338ed | 216 | struct usbip_header *pdu) |
4d7b5c7f | 217 | { |
c5a73ee2 | 218 | int ret; |
4d7b5c7f | 219 | unsigned long flags; |
4d7b5c7f TH |
220 | struct stub_priv *priv; |
221 | ||
4d7b5c7f TH |
222 | spin_lock_irqsave(&sdev->priv_lock, flags); |
223 | ||
88a1e909 | 224 | list_for_each_entry(priv, &sdev->priv_init, list) { |
c5a73ee2 KK |
225 | if (priv->seqnum != pdu->u.cmd_unlink.seqnum) |
226 | continue; | |
227 | ||
228 | dev_info(&priv->urb->dev->dev, "unlink urb %p\n", | |
229 | priv->urb); | |
230 | ||
231 | /* | |
232 | * This matched urb is not completed yet (i.e., be in | |
233 | * flight in usb hcd hardware/driver). Now we are | |
234 | * cancelling it. The unlinking flag means that we are | |
235 | * now not going to return the normal result pdu of a | |
236 | * submission request, but going to return a result pdu | |
237 | * of the unlink request. | |
238 | */ | |
239 | priv->unlinking = 1; | |
240 | ||
241 | /* | |
242 | * In the case that unlinking flag is on, prev->seqnum | |
243 | * is changed from the seqnum of the cancelling urb to | |
244 | * the seqnum of the unlink request. This will be used | |
245 | * to make the result pdu of the unlink request. | |
246 | */ | |
247 | priv->seqnum = pdu->base.seqnum; | |
248 | ||
249 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
250 | ||
251 | /* | |
252 | * usb_unlink_urb() is now out of spinlocking to avoid | |
253 | * spinlock recursion since stub_complete() is | |
254 | * sometimes called in this context but not in the | |
255 | * interrupt context. If stub_complete() is executed | |
256 | * before we call usb_unlink_urb(), usb_unlink_urb() | |
257 | * will return an error value. In this case, stub_tx | |
258 | * will return the result pdu of this unlink request | |
259 | * though submission is completed and actual unlinking | |
260 | * is not executed. OK? | |
261 | */ | |
262 | /* In the above case, urb->status is not -ECONNRESET, | |
263 | * so a driver in a client host will know the failure | |
264 | * of the unlink request ? | |
265 | */ | |
266 | ret = usb_unlink_urb(priv->urb); | |
267 | if (ret != -EINPROGRESS) | |
268 | dev_err(&priv->urb->dev->dev, | |
269 | "failed to unlink a urb %p, ret %d\n", | |
270 | priv->urb, ret); | |
271 | ||
272 | return 0; | |
4d7b5c7f TH |
273 | } |
274 | ||
b8868e45 | 275 | usbip_dbg_stub_rx("seqnum %d is not pending\n", |
64f338ed | 276 | pdu->u.cmd_unlink.seqnum); |
4d7b5c7f TH |
277 | |
278 | /* | |
279 | * The urb of the unlink target is not found in priv_init queue. It was | |
280 | * already completed and its results is/was going to be sent by a | |
281 | * CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only | |
282 | * return the completeness of this unlink request to vhci_hcd. | |
283 | */ | |
284 | stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0); | |
285 | ||
286 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
287 | ||
4d7b5c7f TH |
288 | return 0; |
289 | } | |
290 | ||
291 | static int valid_request(struct stub_device *sdev, struct usbip_header *pdu) | |
292 | { | |
293 | struct usbip_device *ud = &sdev->ud; | |
9ba422b3 | 294 | int valid = 0; |
4d7b5c7f TH |
295 | |
296 | if (pdu->base.devid == sdev->devid) { | |
dcf14779 | 297 | spin_lock_irq(&ud->lock); |
4d7b5c7f TH |
298 | if (ud->status == SDEV_ST_USED) { |
299 | /* A request is valid. */ | |
9ba422b3 | 300 | valid = 1; |
4d7b5c7f | 301 | } |
dcf14779 | 302 | spin_unlock_irq(&ud->lock); |
4d7b5c7f TH |
303 | } |
304 | ||
9ba422b3 | 305 | return valid; |
4d7b5c7f TH |
306 | } |
307 | ||
308 | static struct stub_priv *stub_priv_alloc(struct stub_device *sdev, | |
309 | struct usbip_header *pdu) | |
310 | { | |
311 | struct stub_priv *priv; | |
312 | struct usbip_device *ud = &sdev->ud; | |
313 | unsigned long flags; | |
314 | ||
315 | spin_lock_irqsave(&sdev->priv_lock, flags); | |
316 | ||
e68f2849 | 317 | priv = kmem_cache_zalloc(stub_priv_cache, GFP_ATOMIC); |
4d7b5c7f | 318 | if (!priv) { |
8c7003a3 | 319 | dev_err(&sdev->udev->dev, "alloc stub_priv\n"); |
4d7b5c7f TH |
320 | spin_unlock_irqrestore(&sdev->priv_lock, flags); |
321 | usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); | |
322 | return NULL; | |
323 | } | |
324 | ||
4d7b5c7f TH |
325 | priv->seqnum = pdu->base.seqnum; |
326 | priv->sdev = sdev; | |
327 | ||
328 | /* | |
329 | * After a stub_priv is linked to a list_head, | |
330 | * our error handler can free allocated data. | |
331 | */ | |
332 | list_add_tail(&priv->list, &sdev->priv_init); | |
333 | ||
334 | spin_unlock_irqrestore(&sdev->priv_lock, flags); | |
335 | ||
336 | return priv; | |
337 | } | |
338 | ||
4d7b5c7f TH |
339 | static int get_pipe(struct stub_device *sdev, int epnum, int dir) |
340 | { | |
2d8f4595 | 341 | struct usb_device *udev = sdev->udev; |
4d7b5c7f TH |
342 | struct usb_host_endpoint *ep; |
343 | struct usb_endpoint_descriptor *epd = NULL; | |
344 | ||
ab30f12d EK |
345 | if (dir == USBIP_DIR_IN) |
346 | ep = udev->ep_in[epnum & 0x7f]; | |
347 | else | |
348 | ep = udev->ep_out[epnum & 0x7f]; | |
4d7b5c7f | 349 | if (!ep) { |
8c7003a3 | 350 | dev_err(&sdev->udev->dev, "no such endpoint?, %d\n", |
4d7b5c7f TH |
351 | epnum); |
352 | BUG(); | |
353 | } | |
354 | ||
355 | epd = &ep->desc; | |
4d7b5c7f TH |
356 | if (usb_endpoint_xfer_control(epd)) { |
357 | if (dir == USBIP_DIR_OUT) | |
358 | return usb_sndctrlpipe(udev, epnum); | |
359 | else | |
360 | return usb_rcvctrlpipe(udev, epnum); | |
361 | } | |
362 | ||
363 | if (usb_endpoint_xfer_bulk(epd)) { | |
364 | if (dir == USBIP_DIR_OUT) | |
365 | return usb_sndbulkpipe(udev, epnum); | |
366 | else | |
367 | return usb_rcvbulkpipe(udev, epnum); | |
368 | } | |
369 | ||
370 | if (usb_endpoint_xfer_int(epd)) { | |
371 | if (dir == USBIP_DIR_OUT) | |
372 | return usb_sndintpipe(udev, epnum); | |
373 | else | |
374 | return usb_rcvintpipe(udev, epnum); | |
375 | } | |
376 | ||
377 | if (usb_endpoint_xfer_isoc(epd)) { | |
378 | if (dir == USBIP_DIR_OUT) | |
379 | return usb_sndisocpipe(udev, epnum); | |
380 | else | |
381 | return usb_rcvisocpipe(udev, epnum); | |
382 | } | |
383 | ||
384 | /* NOT REACHED */ | |
8c7003a3 | 385 | dev_err(&sdev->udev->dev, "get pipe, epnum %d\n", epnum); |
4d7b5c7f TH |
386 | return 0; |
387 | } | |
388 | ||
b7a937e9 EK |
389 | static void masking_bogus_flags(struct urb *urb) |
390 | { | |
391 | int xfertype; | |
392 | struct usb_device *dev; | |
393 | struct usb_host_endpoint *ep; | |
394 | int is_out; | |
395 | unsigned int allowed; | |
396 | ||
397 | if (!urb || urb->hcpriv || !urb->complete) | |
398 | return; | |
399 | dev = urb->dev; | |
400 | if ((!dev) || (dev->state < USB_STATE_UNAUTHENTICATED)) | |
401 | return; | |
402 | ||
403 | ep = (usb_pipein(urb->pipe) ? dev->ep_in : dev->ep_out) | |
64f338ed | 404 | [usb_pipeendpoint(urb->pipe)]; |
b7a937e9 EK |
405 | if (!ep) |
406 | return; | |
407 | ||
408 | xfertype = usb_endpoint_type(&ep->desc); | |
409 | if (xfertype == USB_ENDPOINT_XFER_CONTROL) { | |
410 | struct usb_ctrlrequest *setup = | |
64f338ed | 411 | (struct usb_ctrlrequest *) urb->setup_packet; |
b7a937e9 EK |
412 | |
413 | if (!setup) | |
414 | return; | |
415 | is_out = !(setup->bRequestType & USB_DIR_IN) || | |
64f338ed | 416 | !setup->wLength; |
b7a937e9 EK |
417 | } else { |
418 | is_out = usb_endpoint_dir_out(&ep->desc); | |
419 | } | |
420 | ||
421 | /* enforce simple/standard policy */ | |
3924865f GKH |
422 | allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT | |
423 | URB_DIR_MASK | URB_FREE_BUFFER); | |
b7a937e9 EK |
424 | switch (xfertype) { |
425 | case USB_ENDPOINT_XFER_BULK: | |
426 | if (is_out) | |
427 | allowed |= URB_ZERO_PACKET; | |
428 | /* FALLTHROUGH */ | |
429 | case USB_ENDPOINT_XFER_CONTROL: | |
430 | allowed |= URB_NO_FSBR; /* only affects UHCI */ | |
431 | /* FALLTHROUGH */ | |
432 | default: /* all non-iso endpoints */ | |
433 | if (!is_out) | |
434 | allowed |= URB_SHORT_NOT_OK; | |
435 | break; | |
436 | case USB_ENDPOINT_XFER_ISOC: | |
437 | allowed |= URB_ISO_ASAP; | |
438 | break; | |
439 | } | |
440 | urb->transfer_flags &= allowed; | |
441 | } | |
442 | ||
4d7b5c7f TH |
443 | static void stub_recv_cmd_submit(struct stub_device *sdev, |
444 | struct usbip_header *pdu) | |
445 | { | |
446 | int ret; | |
447 | struct stub_priv *priv; | |
448 | struct usbip_device *ud = &sdev->ud; | |
2d8f4595 | 449 | struct usb_device *udev = sdev->udev; |
4d7b5c7f TH |
450 | int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction); |
451 | ||
4d7b5c7f TH |
452 | priv = stub_priv_alloc(sdev, pdu); |
453 | if (!priv) | |
454 | return; | |
455 | ||
456 | /* setup a urb */ | |
457 | if (usb_pipeisoc(pipe)) | |
458 | priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets, | |
64f338ed | 459 | GFP_KERNEL); |
4d7b5c7f TH |
460 | else |
461 | priv->urb = usb_alloc_urb(0, GFP_KERNEL); | |
462 | ||
463 | if (!priv->urb) { | |
4d7b5c7f TH |
464 | usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); |
465 | return; | |
466 | } | |
467 | ||
c7f00899 | 468 | /* allocate urb transfer buffer, if needed */ |
4d7b5c7f TH |
469 | if (pdu->u.cmd_submit.transfer_buffer_length > 0) { |
470 | priv->urb->transfer_buffer = | |
471 | kzalloc(pdu->u.cmd_submit.transfer_buffer_length, | |
64f338ed | 472 | GFP_KERNEL); |
4d7b5c7f | 473 | if (!priv->urb->transfer_buffer) { |
4d7b5c7f TH |
474 | usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); |
475 | return; | |
476 | } | |
477 | } | |
478 | ||
c7f00899 | 479 | /* copy urb setup packet */ |
94002c07 JL |
480 | priv->urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8, |
481 | GFP_KERNEL); | |
4d7b5c7f | 482 | if (!priv->urb->setup_packet) { |
8c7003a3 | 483 | dev_err(&udev->dev, "allocate setup_packet\n"); |
4d7b5c7f TH |
484 | usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC); |
485 | return; | |
486 | } | |
4d7b5c7f TH |
487 | |
488 | /* set other members from the base header of pdu */ | |
489 | priv->urb->context = (void *) priv; | |
490 | priv->urb->dev = udev; | |
491 | priv->urb->pipe = pipe; | |
492 | priv->urb->complete = stub_complete; | |
493 | ||
494 | usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0); | |
495 | ||
496 | ||
497 | if (usbip_recv_xbuff(ud, priv->urb) < 0) | |
498 | return; | |
499 | ||
500 | if (usbip_recv_iso(ud, priv->urb) < 0) | |
501 | return; | |
502 | ||
503 | /* no need to submit an intercepted request, but harmless? */ | |
504 | tweak_special_requests(priv->urb); | |
505 | ||
b7a937e9 | 506 | masking_bogus_flags(priv->urb); |
4d7b5c7f TH |
507 | /* urb is now ready to submit */ |
508 | ret = usb_submit_urb(priv->urb, GFP_KERNEL); | |
509 | ||
510 | if (ret == 0) | |
b8868e45 | 511 | usbip_dbg_stub_rx("submit urb ok, seqnum %u\n", |
64f338ed | 512 | pdu->base.seqnum); |
4d7b5c7f | 513 | else { |
8c7003a3 | 514 | dev_err(&udev->dev, "submit_urb error, %d\n", ret); |
4d7b5c7f TH |
515 | usbip_dump_header(pdu); |
516 | usbip_dump_urb(priv->urb); | |
517 | ||
518 | /* | |
519 | * Pessimistic. | |
520 | * This connection will be discarded. | |
521 | */ | |
522 | usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT); | |
523 | } | |
524 | ||
b8868e45 | 525 | usbip_dbg_stub_rx("Leave\n"); |
4d7b5c7f TH |
526 | } |
527 | ||
528 | /* recv a pdu */ | |
529 | static void stub_rx_pdu(struct usbip_device *ud) | |
530 | { | |
531 | int ret; | |
532 | struct usbip_header pdu; | |
533 | struct stub_device *sdev = container_of(ud, struct stub_device, ud); | |
b7945b77 | 534 | struct device *dev = &sdev->udev->dev; |
4d7b5c7f | 535 | |
b8868e45 | 536 | usbip_dbg_stub_rx("Enter\n"); |
4d7b5c7f TH |
537 | |
538 | memset(&pdu, 0, sizeof(pdu)); | |
539 | ||
77178807 | 540 | /* receive a pdu header */ |
5a08c526 | 541 | ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu)); |
4d7b5c7f TH |
542 | if (ret != sizeof(pdu)) { |
543 | dev_err(dev, "recv a header, %d\n", ret); | |
544 | usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); | |
545 | return; | |
546 | } | |
547 | ||
548 | usbip_header_correct_endian(&pdu, 0); | |
549 | ||
b8868e45 | 550 | if (usbip_dbg_flag_stub_rx) |
4d7b5c7f TH |
551 | usbip_dump_header(&pdu); |
552 | ||
553 | if (!valid_request(sdev, &pdu)) { | |
554 | dev_err(dev, "recv invalid request\n"); | |
555 | usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); | |
556 | return; | |
557 | } | |
558 | ||
559 | switch (pdu.base.command) { | |
560 | case USBIP_CMD_UNLINK: | |
561 | stub_recv_cmd_unlink(sdev, &pdu); | |
562 | break; | |
563 | ||
564 | case USBIP_CMD_SUBMIT: | |
565 | stub_recv_cmd_submit(sdev, &pdu); | |
566 | break; | |
567 | ||
568 | default: | |
569 | /* NOTREACHED */ | |
570 | dev_err(dev, "unknown pdu\n"); | |
571 | usbip_event_add(ud, SDEV_EVENT_ERROR_TCP); | |
49aecefc | 572 | break; |
4d7b5c7f | 573 | } |
4d7b5c7f TH |
574 | } |
575 | ||
9720b4bc | 576 | int stub_rx_loop(void *data) |
4d7b5c7f | 577 | { |
9720b4bc | 578 | struct usbip_device *ud = data; |
4d7b5c7f | 579 | |
9720b4bc | 580 | while (!kthread_should_stop()) { |
b8868e45 | 581 | if (usbip_event_happened(ud)) |
4d7b5c7f TH |
582 | break; |
583 | ||
584 | stub_rx_pdu(ud); | |
585 | } | |
64f338ed | 586 | |
9720b4bc | 587 | return 0; |
4d7b5c7f | 588 | } |