1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <asm/byteorder.h>
23#include <linux/file.h>
24#include <linux/fs.h>
25#include <linux/kernel.h>
26#include <linux/slab.h>
27#include <linux/stat.h>
28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <net/sock.h>
31
32#include "usbip_common.h"
33
34#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
35#define DRIVER_DESC "USB/IP Core"
36
37#ifdef CONFIG_USBIP_DEBUG
38unsigned long usbip_debug_flag = 0xffffffff;
39#else
40unsigned long usbip_debug_flag;
41#endif
42EXPORT_SYMBOL_GPL(usbip_debug_flag);
43module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
44MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");
45
46
47struct device_attribute dev_attr_usbip_debug;
48EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
49
50static ssize_t usbip_debug_show(struct device *dev,
51 struct device_attribute *attr, char *buf)
52{
53 return sprintf(buf, "%lx\n", usbip_debug_flag);
54}
55
56static ssize_t usbip_debug_store(struct device *dev,
57 struct device_attribute *attr, const char *buf,
58 size_t count)
59{
60 if (sscanf(buf, "%lx", &usbip_debug_flag) != 1)
61 return -EINVAL;
62 return count;
63}
64DEVICE_ATTR_RW(usbip_debug);
65
66static void usbip_dump_buffer(char *buff, int bufflen)
67{
68 print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
69 buff, bufflen, false);
70}
71
72static void usbip_dump_pipe(unsigned int p)
73{
74 unsigned char type = usb_pipetype(p);
75 unsigned char ep = usb_pipeendpoint(p);
76 unsigned char dev = usb_pipedevice(p);
77 unsigned char dir = usb_pipein(p);
78
79 pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
80
81 switch (type) {
82 case PIPE_ISOCHRONOUS:
83 pr_debug("ISO\n");
84 break;
85 case PIPE_INTERRUPT:
86 pr_debug("INT\n");
87 break;
88 case PIPE_CONTROL:
89 pr_debug("CTRL\n");
90 break;
91 case PIPE_BULK:
92 pr_debug("BULK\n");
93 break;
94 default:
95 pr_debug("ERR\n");
96 break;
97 }
98}
99
100static void usbip_dump_usb_device(struct usb_device *udev)
101{
102 struct device *dev = &udev->dev;
103 int i;
104
105 dev_dbg(dev, " devnum(%d) devpath(%s) usb speed(%s)",
106 udev->devnum, udev->devpath, usb_speed_string(udev->speed));
107
108 pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
109
110 dev_dbg(dev, " ");
111 for (i = 0; i < 16; i++)
112 pr_debug(" %2u", i);
113 pr_debug("\n");
114
115 dev_dbg(dev, " toggle0(IN) :");
116 for (i = 0; i < 16; i++)
117 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
118 pr_debug("\n");
119
120 dev_dbg(dev, " toggle1(OUT):");
121 for (i = 0; i < 16; i++)
122 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
123 pr_debug("\n");
124
125 dev_dbg(dev, " epmaxp_in :");
126 for (i = 0; i < 16; i++) {
127 if (udev->ep_in[i])
128 pr_debug(" %2u",
129 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
130 }
131 pr_debug("\n");
132
133 dev_dbg(dev, " epmaxp_out :");
134 for (i = 0; i < 16; i++) {
135 if (udev->ep_out[i])
136 pr_debug(" %2u",
137 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
138 }
139 pr_debug("\n");
140
141 dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
142
143 dev_dbg(dev,
144 "descriptor %p, config %p, actconfig %p, rawdescriptors %p\n",
145 &udev->descriptor, udev->config,
146 udev->actconfig, udev->rawdescriptors);
147
148 dev_dbg(dev, "have_langid %d, string_langid %d\n",
149 udev->have_langid, udev->string_langid);
150
151 dev_dbg(dev, "maxchild %d\n", udev->maxchild);
152}
153
154static void usbip_dump_request_type(__u8 rt)
155{
156 switch (rt & USB_RECIP_MASK) {
157 case USB_RECIP_DEVICE:
158 pr_debug("DEVICE");
159 break;
160 case USB_RECIP_INTERFACE:
161 pr_debug("INTERF");
162 break;
163 case USB_RECIP_ENDPOINT:
164 pr_debug("ENDPOI");
165 break;
166 case USB_RECIP_OTHER:
167 pr_debug("OTHER ");
168 break;
169 default:
170 pr_debug("------");
171 break;
172 }
173}
174
175static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
176{
177 if (!cmd) {
178 pr_debug(" : null pointer\n");
179 return;
180 }
181
182 pr_debug(" ");
183 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ",
184 cmd->bRequestType, cmd->bRequest,
185 cmd->wValue, cmd->wIndex, cmd->wLength);
186 pr_debug("\n ");
187
188 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
189 pr_debug("STANDARD ");
190 switch (cmd->bRequest) {
191 case USB_REQ_GET_STATUS:
192 pr_debug("GET_STATUS\n");
193 break;
194 case USB_REQ_CLEAR_FEATURE:
195 pr_debug("CLEAR_FEAT\n");
196 break;
197 case USB_REQ_SET_FEATURE:
198 pr_debug("SET_FEAT\n");
199 break;
200 case USB_REQ_SET_ADDRESS:
201 pr_debug("SET_ADDRRS\n");
202 break;
203 case USB_REQ_GET_DESCRIPTOR:
204 pr_debug("GET_DESCRI\n");
205 break;
206 case USB_REQ_SET_DESCRIPTOR:
207 pr_debug("SET_DESCRI\n");
208 break;
209 case USB_REQ_GET_CONFIGURATION:
210 pr_debug("GET_CONFIG\n");
211 break;
212 case USB_REQ_SET_CONFIGURATION:
213 pr_debug("SET_CONFIG\n");
214 break;
215 case USB_REQ_GET_INTERFACE:
216 pr_debug("GET_INTERF\n");
217 break;
218 case USB_REQ_SET_INTERFACE:
219 pr_debug("SET_INTERF\n");
220 break;
221 case USB_REQ_SYNCH_FRAME:
222 pr_debug("SYNC_FRAME\n");
223 break;
224 default:
225 pr_debug("REQ(%02X)\n", cmd->bRequest);
226 break;
227 }
228 usbip_dump_request_type(cmd->bRequestType);
229 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
230 pr_debug("CLASS\n");
231 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
232 pr_debug("VENDOR\n");
233 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
234 pr_debug("RESERVED\n");
235 }
236}
237
238void usbip_dump_urb(struct urb *urb)
239{
240 struct device *dev;
241
242 if (!urb) {
243 pr_debug("urb: null pointer!!\n");
244 return;
245 }
246
247 if (!urb->dev) {
248 pr_debug("urb->dev: null pointer!!\n");
249 return;
250 }
251
252 dev = &urb->dev->dev;
253
254 dev_dbg(dev, " urb :%p\n", urb);
255 dev_dbg(dev, " dev :%p\n", urb->dev);
256
257 usbip_dump_usb_device(urb->dev);
258
259 dev_dbg(dev, " pipe :%08x ", urb->pipe);
260
261 usbip_dump_pipe(urb->pipe);
262
263 dev_dbg(dev, " status :%d\n", urb->status);
264 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
265 dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
266 dev_dbg(dev, " transfer_buffer_length:%d\n",
267 urb->transfer_buffer_length);
268 dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
269 dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
270
271 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
272 usbip_dump_usb_ctrlrequest(
273 (struct usb_ctrlrequest *)urb->setup_packet);
274
275 dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
276 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
277 dev_dbg(dev, " interval :%d\n", urb->interval);
278 dev_dbg(dev, " error_count :%d\n", urb->error_count);
279 dev_dbg(dev, " context :%p\n", urb->context);
280 dev_dbg(dev, " complete :%p\n", urb->complete);
281}
282EXPORT_SYMBOL_GPL(usbip_dump_urb);
283
284void usbip_dump_header(struct usbip_header *pdu)
285{
286 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
287 pdu->base.command,
288 pdu->base.seqnum,
289 pdu->base.devid,
290 pdu->base.direction,
291 pdu->base.ep);
292
293 switch (pdu->base.command) {
294 case USBIP_CMD_SUBMIT:
295 pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n",
296 pdu->u.cmd_submit.transfer_flags,
297 pdu->u.cmd_submit.transfer_buffer_length,
298 pdu->u.cmd_submit.start_frame,
299 pdu->u.cmd_submit.number_of_packets,
300 pdu->u.cmd_submit.interval);
301 break;
302 case USBIP_CMD_UNLINK:
303 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
304 pdu->u.cmd_unlink.seqnum);
305 break;
306 case USBIP_RET_SUBMIT:
307 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
308 pdu->u.ret_submit.status,
309 pdu->u.ret_submit.actual_length,
310 pdu->u.ret_submit.start_frame,
311 pdu->u.ret_submit.number_of_packets,
312 pdu->u.ret_submit.error_count);
313 break;
314 case USBIP_RET_UNLINK:
315 pr_debug("USBIP_RET_UNLINK: status %d\n",
316 pdu->u.ret_unlink.status);
317 break;
318 default:
319
320 pr_err("unknown command\n");
321 break;
322 }
323}
324EXPORT_SYMBOL_GPL(usbip_dump_header);
325
326
327int usbip_recv(struct socket *sock, void *buf, int size)
328{
329 int result;
330 struct kvec iov = {.iov_base = buf, .iov_len = size};
331 struct msghdr msg = {.msg_flags = MSG_NOSIGNAL};
332 int total = 0;
333
334 iov_iter_kvec(&msg.msg_iter, READ|ITER_KVEC, &iov, 1, size);
335
336 usbip_dbg_xmit("enter\n");
337
338 if (!sock || !buf || !size) {
339 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
340 size);
341 return -EINVAL;
342 }
343
344 do {
345 int sz = msg_data_left(&msg);
346 sock->sk->sk_allocation = GFP_NOIO;
347
348 result = sock_recvmsg(sock, &msg, MSG_WAITALL);
349 if (result <= 0) {
350 pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
351 sock, buf + total, sz, result, total);
352 goto err;
353 }
354
355 total += result;
356 } while (msg_data_left(&msg));
357
358 if (usbip_dbg_flag_xmit) {
359 if (!in_interrupt())
360 pr_debug("%-10s:", current->comm);
361 else
362 pr_debug("interrupt :");
363
364 pr_debug("receiving....\n");
365 usbip_dump_buffer(buf, size);
366 pr_debug("received, osize %d ret %d size %zd total %d\n",
367 size, result, msg_data_left(&msg), total);
368 }
369
370 return total;
371
372err:
373 return result;
374}
375EXPORT_SYMBOL_GPL(usbip_recv);
376
377
378static unsigned int tweak_transfer_flags(unsigned int flags)
379{
380 flags &= ~URB_NO_TRANSFER_DMA_MAP;
381 return flags;
382}
383
384static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
385 int pack)
386{
387 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
388
389
390
391
392
393 if (pack) {
394 spdu->transfer_flags =
395 tweak_transfer_flags(urb->transfer_flags);
396 spdu->transfer_buffer_length = urb->transfer_buffer_length;
397 spdu->start_frame = urb->start_frame;
398 spdu->number_of_packets = urb->number_of_packets;
399 spdu->interval = urb->interval;
400 } else {
401 urb->transfer_flags = spdu->transfer_flags;
402 urb->transfer_buffer_length = spdu->transfer_buffer_length;
403 urb->start_frame = spdu->start_frame;
404 urb->number_of_packets = spdu->number_of_packets;
405 urb->interval = spdu->interval;
406 }
407}
408
409static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
410 int pack)
411{
412 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
413
414 if (pack) {
415 rpdu->status = urb->status;
416 rpdu->actual_length = urb->actual_length;
417 rpdu->start_frame = urb->start_frame;
418 rpdu->number_of_packets = urb->number_of_packets;
419 rpdu->error_count = urb->error_count;
420 } else {
421 urb->status = rpdu->status;
422 urb->actual_length = rpdu->actual_length;
423 urb->start_frame = rpdu->start_frame;
424 urb->number_of_packets = rpdu->number_of_packets;
425 urb->error_count = rpdu->error_count;
426 }
427}
428
429void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
430 int pack)
431{
432 switch (cmd) {
433 case USBIP_CMD_SUBMIT:
434 usbip_pack_cmd_submit(pdu, urb, pack);
435 break;
436 case USBIP_RET_SUBMIT:
437 usbip_pack_ret_submit(pdu, urb, pack);
438 break;
439 default:
440
441 pr_err("unknown command\n");
442 break;
443 }
444}
445EXPORT_SYMBOL_GPL(usbip_pack_pdu);
446
447static void correct_endian_basic(struct usbip_header_basic *base, int send)
448{
449 if (send) {
450 base->command = cpu_to_be32(base->command);
451 base->seqnum = cpu_to_be32(base->seqnum);
452 base->devid = cpu_to_be32(base->devid);
453 base->direction = cpu_to_be32(base->direction);
454 base->ep = cpu_to_be32(base->ep);
455 } else {
456 base->command = be32_to_cpu(base->command);
457 base->seqnum = be32_to_cpu(base->seqnum);
458 base->devid = be32_to_cpu(base->devid);
459 base->direction = be32_to_cpu(base->direction);
460 base->ep = be32_to_cpu(base->ep);
461 }
462}
463
464static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
465 int send)
466{
467 if (send) {
468 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
469
470 cpu_to_be32s(&pdu->transfer_buffer_length);
471 cpu_to_be32s(&pdu->start_frame);
472 cpu_to_be32s(&pdu->number_of_packets);
473 cpu_to_be32s(&pdu->interval);
474 } else {
475 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
476
477 be32_to_cpus(&pdu->transfer_buffer_length);
478 be32_to_cpus(&pdu->start_frame);
479 be32_to_cpus(&pdu->number_of_packets);
480 be32_to_cpus(&pdu->interval);
481 }
482}
483
484static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
485 int send)
486{
487 if (send) {
488 cpu_to_be32s(&pdu->status);
489 cpu_to_be32s(&pdu->actual_length);
490 cpu_to_be32s(&pdu->start_frame);
491 cpu_to_be32s(&pdu->number_of_packets);
492 cpu_to_be32s(&pdu->error_count);
493 } else {
494 be32_to_cpus(&pdu->status);
495 be32_to_cpus(&pdu->actual_length);
496 be32_to_cpus(&pdu->start_frame);
497 be32_to_cpus(&pdu->number_of_packets);
498 be32_to_cpus(&pdu->error_count);
499 }
500}
501
502static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
503 int send)
504{
505 if (send)
506 pdu->seqnum = cpu_to_be32(pdu->seqnum);
507 else
508 pdu->seqnum = be32_to_cpu(pdu->seqnum);
509}
510
511static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
512 int send)
513{
514 if (send)
515 cpu_to_be32s(&pdu->status);
516 else
517 be32_to_cpus(&pdu->status);
518}
519
520void usbip_header_correct_endian(struct usbip_header *pdu, int send)
521{
522 __u32 cmd = 0;
523
524 if (send)
525 cmd = pdu->base.command;
526
527 correct_endian_basic(&pdu->base, send);
528
529 if (!send)
530 cmd = pdu->base.command;
531
532 switch (cmd) {
533 case USBIP_CMD_SUBMIT:
534 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
535 break;
536 case USBIP_RET_SUBMIT:
537 correct_endian_ret_submit(&pdu->u.ret_submit, send);
538 break;
539 case USBIP_CMD_UNLINK:
540 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
541 break;
542 case USBIP_RET_UNLINK:
543 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
544 break;
545 default:
546
547 pr_err("unknown command\n");
548 break;
549 }
550}
551EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
552
553static void usbip_iso_packet_correct_endian(
554 struct usbip_iso_packet_descriptor *iso, int send)
555{
556
557 if (send) {
558 iso->offset = cpu_to_be32(iso->offset);
559 iso->length = cpu_to_be32(iso->length);
560 iso->status = cpu_to_be32(iso->status);
561 iso->actual_length = cpu_to_be32(iso->actual_length);
562 } else {
563 iso->offset = be32_to_cpu(iso->offset);
564 iso->length = be32_to_cpu(iso->length);
565 iso->status = be32_to_cpu(iso->status);
566 iso->actual_length = be32_to_cpu(iso->actual_length);
567 }
568}
569
570static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
571 struct usb_iso_packet_descriptor *uiso, int pack)
572{
573 if (pack) {
574 iso->offset = uiso->offset;
575 iso->length = uiso->length;
576 iso->status = uiso->status;
577 iso->actual_length = uiso->actual_length;
578 } else {
579 uiso->offset = iso->offset;
580 uiso->length = iso->length;
581 uiso->status = iso->status;
582 uiso->actual_length = iso->actual_length;
583 }
584}
585
586
587struct usbip_iso_packet_descriptor*
588usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
589{
590 struct usbip_iso_packet_descriptor *iso;
591 int np = urb->number_of_packets;
592 ssize_t size = np * sizeof(*iso);
593 int i;
594
595 iso = kzalloc(size, GFP_KERNEL);
596 if (!iso)
597 return NULL;
598
599 for (i = 0; i < np; i++) {
600 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1);
601 usbip_iso_packet_correct_endian(&iso[i], 1);
602 }
603
604 *bufflen = size;
605
606 return iso;
607}
608EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
609
610
611int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
612{
613 void *buff;
614 struct usbip_iso_packet_descriptor *iso;
615 int np = urb->number_of_packets;
616 int size = np * sizeof(*iso);
617 int i;
618 int ret;
619 int total_length = 0;
620
621 if (!usb_pipeisoc(urb->pipe))
622 return 0;
623
624
625 if (np == 0)
626 return 0;
627
628 buff = kzalloc(size, GFP_KERNEL);
629 if (!buff)
630 return -ENOMEM;
631
632 ret = usbip_recv(ud->tcp_socket, buff, size);
633 if (ret != size) {
634 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
635 ret);
636 kfree(buff);
637
638 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
639 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
640 else
641 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
642
643 return -EPIPE;
644 }
645
646 iso = (struct usbip_iso_packet_descriptor *) buff;
647 for (i = 0; i < np; i++) {
648 usbip_iso_packet_correct_endian(&iso[i], 0);
649 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0);
650 total_length += urb->iso_frame_desc[i].actual_length;
651 }
652
653 kfree(buff);
654
655 if (total_length != urb->actual_length) {
656 dev_err(&urb->dev->dev,
657 "total length of iso packets %d not equal to actual length of buffer %d\n",
658 total_length, urb->actual_length);
659
660 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
661 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
662 else
663 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
664
665 return -EPIPE;
666 }
667
668 return ret;
669}
670EXPORT_SYMBOL_GPL(usbip_recv_iso);
671
672
673
674
675
676
677
678
679void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
680{
681 int np = urb->number_of_packets;
682 int i;
683 int actualoffset = urb->actual_length;
684
685 if (!usb_pipeisoc(urb->pipe))
686 return;
687
688
689 if (np == 0 || urb->actual_length == 0)
690 return;
691
692
693
694
695
696 if (urb->actual_length == urb->transfer_buffer_length)
697 return;
698
699
700
701
702
703 for (i = np-1; i > 0; i--) {
704 actualoffset -= urb->iso_frame_desc[i].actual_length;
705 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
706 urb->transfer_buffer + actualoffset,
707 urb->iso_frame_desc[i].actual_length);
708 }
709}
710EXPORT_SYMBOL_GPL(usbip_pad_iso);
711
712
713int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
714{
715 int ret;
716 int size;
717
718 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
719
720 if (usb_pipein(urb->pipe))
721 return 0;
722
723 size = urb->transfer_buffer_length;
724 } else {
725
726 if (usb_pipeout(urb->pipe))
727 return 0;
728
729 size = urb->actual_length;
730 }
731
732
733 if (!(size > 0))
734 return 0;
735
736 if (size > urb->transfer_buffer_length) {
737
738 if (ud->side == USBIP_STUB) {
739 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
740 return 0;
741 } else {
742 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
743 return -EPIPE;
744 }
745 }
746
747 ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
748 if (ret != size) {
749 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
750 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
751 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
752 } else {
753 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
754 return -EPIPE;
755 }
756 }
757
758 return ret;
759}
760EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
761
762static int __init usbip_core_init(void)
763{
764 int ret;
765
766 ret = usbip_init_eh();
767 if (ret)
768 return ret;
769
770 return 0;
771}
772
773static void __exit usbip_core_exit(void)
774{
775 usbip_finish_eh();
776 return;
777}
778
779module_init(usbip_core_init);
780module_exit(usbip_core_exit);
781
782MODULE_AUTHOR(DRIVER_AUTHOR);
783MODULE_DESCRIPTION(DRIVER_DESC);
784MODULE_LICENSE("GPL");
785
