2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
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.
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.
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,
20 #include <asm/byteorder.h>
21 #include <linux/kthread.h>
22 #include <linux/usb.h>
23 #include <linux/usb/hcd.h>
25 #include "usbip_common.h"
28 static int is_clear_halt_cmd(struct urb *urb)
30 struct usb_ctrlrequest *req;
32 req = (struct usb_ctrlrequest *) urb->setup_packet;
34 return (req->bRequest == USB_REQ_CLEAR_FEATURE) &&
35 (req->bRequestType == USB_RECIP_ENDPOINT) &&
36 (req->wValue == USB_ENDPOINT_HALT);
39 static int is_set_interface_cmd(struct urb *urb)
41 struct usb_ctrlrequest *req;
43 req = (struct usb_ctrlrequest *) urb->setup_packet;
45 return (req->bRequest == USB_REQ_SET_INTERFACE) &&
46 (req->bRequestType == USB_RECIP_INTERFACE);
49 static int is_set_configuration_cmd(struct urb *urb)
51 struct usb_ctrlrequest *req;
53 req = (struct usb_ctrlrequest *) urb->setup_packet;
55 return (req->bRequest == USB_REQ_SET_CONFIGURATION) &&
56 (req->bRequestType == USB_RECIP_DEVICE);
59 static int is_reset_device_cmd(struct urb *urb)
61 struct usb_ctrlrequest *req;
65 req = (struct usb_ctrlrequest *) urb->setup_packet;
66 value = le16_to_cpu(req->wValue);
67 index = le16_to_cpu(req->wIndex);
69 if ((req->bRequest == USB_REQ_SET_FEATURE) &&
70 (req->bRequestType == USB_RT_PORT) &&
71 (value == USB_PORT_FEAT_RESET)) {
72 usbip_dbg_stub_rx("reset_device_cmd, port %u\n", index);
78 static int tweak_clear_halt_cmd(struct urb *urb)
80 struct usb_ctrlrequest *req;
86 req = (struct usb_ctrlrequest *) urb->setup_packet;
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
93 target_endp = le16_to_cpu(req->wIndex) & 0x000f;
95 /* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80. */
96 target_dir = le16_to_cpu(req->wIndex) & 0x0080;
99 target_pipe = usb_rcvctrlpipe(urb->dev, target_endp);
101 target_pipe = usb_sndctrlpipe(urb->dev, target_endp);
103 ret = usb_clear_halt(urb->dev, target_pipe);
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);
109 dev_info(&urb->dev->dev,
110 "usb_clear_halt done: devnum %d endp %d\n",
111 urb->dev->devnum, target_endp);
116 static int tweak_set_interface_cmd(struct urb *urb)
118 struct usb_ctrlrequest *req;
123 req = (struct usb_ctrlrequest *) urb->setup_packet;
124 alternate = le16_to_cpu(req->wValue);
125 interface = le16_to_cpu(req->wIndex);
127 usbip_dbg_stub_rx("set_interface: inf %u alt %u\n",
128 interface, alternate);
130 ret = usb_set_interface(urb->dev, interface, alternate);
132 dev_err(&urb->dev->dev,
133 "usb_set_interface error: inf %u alt %u ret %d\n",
134 interface, alternate, ret);
136 dev_info(&urb->dev->dev,
137 "usb_set_interface done: inf %u alt %u\n",
138 interface, alternate);
143 static int tweak_set_configuration_cmd(struct urb *urb)
145 struct stub_priv *priv = (struct stub_priv *) urb->context;
146 struct stub_device *sdev = priv->sdev;
147 struct usb_ctrlrequest *req;
151 req = (struct usb_ctrlrequest *) urb->setup_packet;
152 config = le16_to_cpu(req->wValue);
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",
161 static int tweak_reset_device_cmd(struct urb *urb)
163 struct stub_priv *priv = (struct stub_priv *) urb->context;
164 struct stub_device *sdev = priv->sdev;
166 dev_info(&urb->dev->dev, "usb_queue_reset_device\n");
169 * With the implementation of pre_reset and post_reset the driver no
170 * longer unbinds. This allows the use of synchronous reset.
173 if (usb_lock_device_for_reset(sdev->udev, sdev->interface) < 0) {
174 dev_err(&urb->dev->dev, "could not obtain lock to reset device\n");
177 usb_reset_device(sdev->udev);
178 usb_unlock_device(sdev->udev);
184 * clear_halt, set_interface, and set_configuration require special tricks.
186 static void tweak_special_requests(struct urb *urb)
188 if (!urb || !urb->setup_packet)
191 if (usb_pipetype(urb->pipe) != PIPE_CONTROL)
194 if (is_clear_halt_cmd(urb))
195 /* tweak clear_halt */
196 tweak_clear_halt_cmd(urb);
198 else if (is_set_interface_cmd(urb))
199 /* tweak set_interface */
200 tweak_set_interface_cmd(urb);
202 else if (is_set_configuration_cmd(urb))
203 /* tweak set_configuration */
204 tweak_set_configuration_cmd(urb);
206 else if (is_reset_device_cmd(urb))
207 tweak_reset_device_cmd(urb);
209 usbip_dbg_stub_rx("no need to tweak\n");
213 * stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb().
214 * By unlinking the urb asynchronously, stub_rx can continuously
215 * process coming urbs. Even if the urb is unlinked, its completion
216 * handler will be called and stub_tx will send a return pdu.
218 * See also comments about unlinking strategy in vhci_hcd.c.
220 static int stub_recv_cmd_unlink(struct stub_device *sdev,
221 struct usbip_header *pdu)
225 struct stub_priv *priv;
227 spin_lock_irqsave(&sdev->priv_lock, flags);
229 list_for_each_entry(priv, &sdev->priv_init, list) {
230 if (priv->seqnum != pdu->u.cmd_unlink.seqnum)
233 dev_info(&priv->urb->dev->dev, "unlink urb %p\n",
237 * This matched urb is not completed yet (i.e., be in
238 * flight in usb hcd hardware/driver). Now we are
239 * cancelling it. The unlinking flag means that we are
240 * now not going to return the normal result pdu of a
241 * submission request, but going to return a result pdu
242 * of the unlink request.
247 * In the case that unlinking flag is on, prev->seqnum
248 * is changed from the seqnum of the cancelling urb to
249 * the seqnum of the unlink request. This will be used
250 * to make the result pdu of the unlink request.
252 priv->seqnum = pdu->base.seqnum;
254 spin_unlock_irqrestore(&sdev->priv_lock, flags);
257 * usb_unlink_urb() is now out of spinlocking to avoid
258 * spinlock recursion since stub_complete() is
259 * sometimes called in this context but not in the
260 * interrupt context. If stub_complete() is executed
261 * before we call usb_unlink_urb(), usb_unlink_urb()
262 * will return an error value. In this case, stub_tx
263 * will return the result pdu of this unlink request
264 * though submission is completed and actual unlinking
265 * is not executed. OK?
267 /* In the above case, urb->status is not -ECONNRESET,
268 * so a driver in a client host will know the failure
269 * of the unlink request ?
271 ret = usb_unlink_urb(priv->urb);
272 if (ret != -EINPROGRESS)
273 dev_err(&priv->urb->dev->dev,
274 "failed to unlink a urb %p, ret %d\n",
280 usbip_dbg_stub_rx("seqnum %d is not pending\n",
281 pdu->u.cmd_unlink.seqnum);
284 * The urb of the unlink target is not found in priv_init queue. It was
285 * already completed and its results is/was going to be sent by a
286 * CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only
287 * return the completeness of this unlink request to vhci_hcd.
289 stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0);
291 spin_unlock_irqrestore(&sdev->priv_lock, flags);
296 static int valid_request(struct stub_device *sdev, struct usbip_header *pdu)
298 struct usbip_device *ud = &sdev->ud;
301 if (pdu->base.devid == sdev->devid) {
302 spin_lock_irq(&ud->lock);
303 if (ud->status == SDEV_ST_USED) {
304 /* A request is valid. */
307 spin_unlock_irq(&ud->lock);
313 static struct stub_priv *stub_priv_alloc(struct stub_device *sdev,
314 struct usbip_header *pdu)
316 struct stub_priv *priv;
317 struct usbip_device *ud = &sdev->ud;
320 spin_lock_irqsave(&sdev->priv_lock, flags);
322 priv = kmem_cache_zalloc(stub_priv_cache, GFP_ATOMIC);
324 dev_err(&sdev->interface->dev, "alloc stub_priv\n");
325 spin_unlock_irqrestore(&sdev->priv_lock, flags);
326 usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
330 priv->seqnum = pdu->base.seqnum;
334 * After a stub_priv is linked to a list_head,
335 * our error handler can free allocated data.
337 list_add_tail(&priv->list, &sdev->priv_init);
339 spin_unlock_irqrestore(&sdev->priv_lock, flags);
344 static int get_pipe(struct stub_device *sdev, int epnum, int dir)
346 struct usb_device *udev = sdev->udev;
347 struct usb_host_endpoint *ep;
348 struct usb_endpoint_descriptor *epd = NULL;
350 if (dir == USBIP_DIR_IN)
351 ep = udev->ep_in[epnum & 0x7f];
353 ep = udev->ep_out[epnum & 0x7f];
355 dev_err(&sdev->interface->dev, "no such endpoint?, %d\n",
361 if (usb_endpoint_xfer_control(epd)) {
362 if (dir == USBIP_DIR_OUT)
363 return usb_sndctrlpipe(udev, epnum);
365 return usb_rcvctrlpipe(udev, epnum);
368 if (usb_endpoint_xfer_bulk(epd)) {
369 if (dir == USBIP_DIR_OUT)
370 return usb_sndbulkpipe(udev, epnum);
372 return usb_rcvbulkpipe(udev, epnum);
375 if (usb_endpoint_xfer_int(epd)) {
376 if (dir == USBIP_DIR_OUT)
377 return usb_sndintpipe(udev, epnum);
379 return usb_rcvintpipe(udev, epnum);
382 if (usb_endpoint_xfer_isoc(epd)) {
383 if (dir == USBIP_DIR_OUT)
384 return usb_sndisocpipe(udev, epnum);
386 return usb_rcvisocpipe(udev, epnum);
390 dev_err(&sdev->interface->dev, "get pipe, epnum %d\n", epnum);
394 static void masking_bogus_flags(struct urb *urb)
397 struct usb_device *dev;
398 struct usb_host_endpoint *ep;
400 unsigned int allowed;
402 if (!urb || urb->hcpriv || !urb->complete)
405 if ((!dev) || (dev->state < USB_STATE_UNAUTHENTICATED))
408 ep = (usb_pipein(urb->pipe) ? dev->ep_in : dev->ep_out)
409 [usb_pipeendpoint(urb->pipe)];
413 xfertype = usb_endpoint_type(&ep->desc);
414 if (xfertype == USB_ENDPOINT_XFER_CONTROL) {
415 struct usb_ctrlrequest *setup =
416 (struct usb_ctrlrequest *) urb->setup_packet;
420 is_out = !(setup->bRequestType & USB_DIR_IN) ||
423 is_out = usb_endpoint_dir_out(&ep->desc);
426 /* enforce simple/standard policy */
427 allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT |
428 URB_DIR_MASK | URB_FREE_BUFFER);
430 case USB_ENDPOINT_XFER_BULK:
432 allowed |= URB_ZERO_PACKET;
434 case USB_ENDPOINT_XFER_CONTROL:
435 allowed |= URB_NO_FSBR; /* only affects UHCI */
437 default: /* all non-iso endpoints */
439 allowed |= URB_SHORT_NOT_OK;
441 case USB_ENDPOINT_XFER_ISOC:
442 allowed |= URB_ISO_ASAP;
445 urb->transfer_flags &= allowed;
448 static void stub_recv_cmd_submit(struct stub_device *sdev,
449 struct usbip_header *pdu)
452 struct stub_priv *priv;
453 struct usbip_device *ud = &sdev->ud;
454 struct usb_device *udev = sdev->udev;
455 int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction);
457 priv = stub_priv_alloc(sdev, pdu);
462 if (usb_pipeisoc(pipe))
463 priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
466 priv->urb = usb_alloc_urb(0, GFP_KERNEL);
469 dev_err(&sdev->interface->dev, "malloc urb\n");
470 usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
474 /* allocate urb transfer buffer, if needed */
475 if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
476 priv->urb->transfer_buffer =
477 kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
479 if (!priv->urb->transfer_buffer) {
480 usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
485 /* copy urb setup packet */
486 priv->urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
488 if (!priv->urb->setup_packet) {
489 dev_err(&sdev->interface->dev, "allocate setup_packet\n");
490 usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
494 /* set other members from the base header of pdu */
495 priv->urb->context = (void *) priv;
496 priv->urb->dev = udev;
497 priv->urb->pipe = pipe;
498 priv->urb->complete = stub_complete;
500 usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0);
503 if (usbip_recv_xbuff(ud, priv->urb) < 0)
506 if (usbip_recv_iso(ud, priv->urb) < 0)
509 /* no need to submit an intercepted request, but harmless? */
510 tweak_special_requests(priv->urb);
512 masking_bogus_flags(priv->urb);
513 /* urb is now ready to submit */
514 ret = usb_submit_urb(priv->urb, GFP_KERNEL);
517 usbip_dbg_stub_rx("submit urb ok, seqnum %u\n",
520 dev_err(&sdev->interface->dev, "submit_urb error, %d\n", ret);
521 usbip_dump_header(pdu);
522 usbip_dump_urb(priv->urb);
526 * This connection will be discarded.
528 usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
531 usbip_dbg_stub_rx("Leave\n");
535 static void stub_rx_pdu(struct usbip_device *ud)
538 struct usbip_header pdu;
539 struct stub_device *sdev = container_of(ud, struct stub_device, ud);
540 struct device *dev = &sdev->udev->dev;
542 usbip_dbg_stub_rx("Enter\n");
544 memset(&pdu, 0, sizeof(pdu));
546 /* receive a pdu header */
547 ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
548 if (ret != sizeof(pdu)) {
549 dev_err(dev, "recv a header, %d\n", ret);
550 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
554 usbip_header_correct_endian(&pdu, 0);
556 if (usbip_dbg_flag_stub_rx)
557 usbip_dump_header(&pdu);
559 if (!valid_request(sdev, &pdu)) {
560 dev_err(dev, "recv invalid request\n");
561 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
565 switch (pdu.base.command) {
566 case USBIP_CMD_UNLINK:
567 stub_recv_cmd_unlink(sdev, &pdu);
570 case USBIP_CMD_SUBMIT:
571 stub_recv_cmd_submit(sdev, &pdu);
576 dev_err(dev, "unknown pdu\n");
577 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
582 int stub_rx_loop(void *data)
584 struct usbip_device *ud = data;
586 while (!kthread_should_stop()) {
587 if (usbip_event_happened(ud))