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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / usb / usbip / usbip_common.c
blob2a5d3180777d9aa714162097aad36c1f3d4708d0
1 /*
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 * Copyright (C) 2015-2016 Samsung Electronics
4 * Krzysztof Opasiak <k.opasiak@samsung.com>
5 *
6 * This is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
19 * USA.
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
38 unsigned long usbip_debug_flag = 0xffffffff;
39 #else
40 unsigned long usbip_debug_flag;
41 #endif
42 EXPORT_SYMBOL_GPL(usbip_debug_flag);
43 module_param(usbip_debug_flag, ulong, S_IRUGO|S_IWUSR);
44 MODULE_PARM_DESC(usbip_debug_flag, "debug flags (defined in usbip_common.h)");
45
46 /* FIXME */
47 struct device_attribute dev_attr_usbip_debug;
48 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
49
50 static 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
56 static 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 }
64 DEVICE_ATTR_RW(usbip_debug);
65
66 static 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
72 static 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
100 static 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 hub ttport %d\n", 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 %s, bus %s\n", dev_name(&udev->parent->dev),
142 udev->bus->bus_name);
143
144 dev_dbg(dev, "have_langid %d, string_langid %d\n",
145 udev->have_langid, udev->string_langid);
146
147 dev_dbg(dev, "maxchild %d\n", udev->maxchild);
148 }
149
150 static void usbip_dump_request_type(__u8 rt)
151 {
152 switch (rt & USB_RECIP_MASK) {
153 case USB_RECIP_DEVICE:
154 pr_debug("DEVICE");
155 break;
156 case USB_RECIP_INTERFACE:
157 pr_debug("INTERF");
158 break;
159 case USB_RECIP_ENDPOINT:
160 pr_debug("ENDPOI");
161 break;
162 case USB_RECIP_OTHER:
163 pr_debug("OTHER ");
164 break;
165 default:
166 pr_debug("------");
167 break;
168 }
169 }
170
171 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
172 {
173 if (!cmd) {
174 pr_debug(" : null pointer\n");
175 return;
176 }
177
178 pr_debug(" ");
179 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) wLength(%04X) ",
180 cmd->bRequestType, cmd->bRequest,
181 cmd->wValue, cmd->wIndex, cmd->wLength);
182 pr_debug("\n ");
183
184 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
185 pr_debug("STANDARD ");
186 switch (cmd->bRequest) {
187 case USB_REQ_GET_STATUS:
188 pr_debug("GET_STATUS\n");
189 break;
190 case USB_REQ_CLEAR_FEATURE:
191 pr_debug("CLEAR_FEAT\n");
192 break;
193 case USB_REQ_SET_FEATURE:
194 pr_debug("SET_FEAT\n");
195 break;
196 case USB_REQ_SET_ADDRESS:
197 pr_debug("SET_ADDRRS\n");
198 break;
199 case USB_REQ_GET_DESCRIPTOR:
200 pr_debug("GET_DESCRI\n");
201 break;
202 case USB_REQ_SET_DESCRIPTOR:
203 pr_debug("SET_DESCRI\n");
204 break;
205 case USB_REQ_GET_CONFIGURATION:
206 pr_debug("GET_CONFIG\n");
207 break;
208 case USB_REQ_SET_CONFIGURATION:
209 pr_debug("SET_CONFIG\n");
210 break;
211 case USB_REQ_GET_INTERFACE:
212 pr_debug("GET_INTERF\n");
213 break;
214 case USB_REQ_SET_INTERFACE:
215 pr_debug("SET_INTERF\n");
216 break;
217 case USB_REQ_SYNCH_FRAME:
218 pr_debug("SYNC_FRAME\n");
219 break;
220 default:
221 pr_debug("REQ(%02X)\n", cmd->bRequest);
222 break;
223 }
224 usbip_dump_request_type(cmd->bRequestType);
225 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
226 pr_debug("CLASS\n");
227 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
228 pr_debug("VENDOR\n");
229 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
230 pr_debug("RESERVED\n");
231 }
232 }
233
234 void usbip_dump_urb(struct urb *urb)
235 {
236 struct device *dev;
237
238 if (!urb) {
239 pr_debug("urb: null pointer!!\n");
240 return;
241 }
242
243 if (!urb->dev) {
244 pr_debug("urb->dev: null pointer!!\n");
245 return;
246 }
247
248 dev = &urb->dev->dev;
249
250 usbip_dump_usb_device(urb->dev);
251
252 dev_dbg(dev, " pipe :%08x ", urb->pipe);
253
254 usbip_dump_pipe(urb->pipe);
255
256 dev_dbg(dev, " status :%d\n", urb->status);
257 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
258 dev_dbg(dev, " transfer_buffer_length:%d\n",
259 urb->transfer_buffer_length);
260 dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
261
262 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
263 usbip_dump_usb_ctrlrequest(
264 (struct usb_ctrlrequest *)urb->setup_packet);
265
266 dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
267 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
268 dev_dbg(dev, " interval :%d\n", urb->interval);
269 dev_dbg(dev, " error_count :%d\n", urb->error_count);
270 }
271 EXPORT_SYMBOL_GPL(usbip_dump_urb);
272
273 void usbip_dump_header(struct usbip_header *pdu)
274 {
275 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
276 pdu->base.command,
277 pdu->base.seqnum,
278 pdu->base.devid,
279 pdu->base.direction,
280 pdu->base.ep);
281
282 switch (pdu->base.command) {
283 case USBIP_CMD_SUBMIT:
284 pr_debug("USBIP_CMD_SUBMIT: x_flags %u x_len %u sf %u #p %d iv %d\n",
285 pdu->u.cmd_submit.transfer_flags,
286 pdu->u.cmd_submit.transfer_buffer_length,
287 pdu->u.cmd_submit.start_frame,
288 pdu->u.cmd_submit.number_of_packets,
289 pdu->u.cmd_submit.interval);
290 break;
291 case USBIP_CMD_UNLINK:
292 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
293 pdu->u.cmd_unlink.seqnum);
294 break;
295 case USBIP_RET_SUBMIT:
296 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
297 pdu->u.ret_submit.status,
298 pdu->u.ret_submit.actual_length,
299 pdu->u.ret_submit.start_frame,
300 pdu->u.ret_submit.number_of_packets,
301 pdu->u.ret_submit.error_count);
302 break;
303 case USBIP_RET_UNLINK:
304 pr_debug("USBIP_RET_UNLINK: status %d\n",
305 pdu->u.ret_unlink.status);
306 break;
307 default:
308 /* NOT REACHED */
309 pr_err("unknown command\n");
310 break;
311 }
312 }
313 EXPORT_SYMBOL_GPL(usbip_dump_header);
314
315 /* Receive data over TCP/IP. */
316 int usbip_recv(struct socket *sock, void *buf, int size)
317 {
318 int result;
319 struct msghdr msg;
320 struct kvec iov;
321 int total = 0;
322
323 /* for blocks of if (usbip_dbg_flag_xmit) */
324 char *bp = buf;
325 int osize = size;
326
327 if (!sock || !buf || !size)
328 return -EINVAL;
329
330 usbip_dbg_xmit("enter\n");
331
332 do {
333 sock->sk->sk_allocation = GFP_NOIO;
334 iov.iov_base = buf;
335 iov.iov_len = size;
336 msg.msg_name = NULL;
337 msg.msg_namelen = 0;
338 msg.msg_control = NULL;
339 msg.msg_controllen = 0;
340 msg.msg_flags = MSG_NOSIGNAL;
341
342 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
343 if (result <= 0)
344 goto err;
345
346 size -= result;
347 buf += result;
348 total += result;
349 } while (size > 0);
350
351 if (usbip_dbg_flag_xmit) {
352 if (!in_interrupt())
353 pr_debug("%-10s:", current->comm);
354 else
355 pr_debug("interrupt :");
356
357 pr_debug("receiving....\n");
358 usbip_dump_buffer(bp, osize);
359 pr_debug("received, osize %d ret %d size %d total %d\n",
360 osize, result, size, total);
361 }
362
363 return total;
364
365 err:
366 return result;
367 }
368 EXPORT_SYMBOL_GPL(usbip_recv);
369
370 /* there may be more cases to tweak the flags. */
371 static unsigned int tweak_transfer_flags(unsigned int flags)
372 {
373 flags &= ~URB_NO_TRANSFER_DMA_MAP;
374 return flags;
375 }
376
377 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
378 int pack)
379 {
380 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
381
382 /*
383 * Some members are not still implemented in usbip. I hope this issue
384 * will be discussed when usbip is ported to other operating systems.
385 */
386 if (pack) {
387 spdu->transfer_flags =
388 tweak_transfer_flags(urb->transfer_flags);
389 spdu->transfer_buffer_length = urb->transfer_buffer_length;
390 spdu->start_frame = urb->start_frame;
391 spdu->number_of_packets = urb->number_of_packets;
392 spdu->interval = urb->interval;
393 } else {
394 urb->transfer_flags = spdu->transfer_flags;
395 urb->transfer_buffer_length = spdu->transfer_buffer_length;
396 urb->start_frame = spdu->start_frame;
397 urb->number_of_packets = spdu->number_of_packets;
398 urb->interval = spdu->interval;
399 }
400 }
401
402 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
403 int pack)
404 {
405 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
406
407 if (pack) {
408 rpdu->status = urb->status;
409 rpdu->actual_length = urb->actual_length;
410 rpdu->start_frame = urb->start_frame;
411 rpdu->number_of_packets = urb->number_of_packets;
412 rpdu->error_count = urb->error_count;
413 } else {
414 urb->status = rpdu->status;
415 urb->actual_length = rpdu->actual_length;
416 urb->start_frame = rpdu->start_frame;
417 urb->number_of_packets = rpdu->number_of_packets;
418 urb->error_count = rpdu->error_count;
419 }
420 }
421
422 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
423 int pack)
424 {
425 switch (cmd) {
426 case USBIP_CMD_SUBMIT:
427 usbip_pack_cmd_submit(pdu, urb, pack);
428 break;
429 case USBIP_RET_SUBMIT:
430 usbip_pack_ret_submit(pdu, urb, pack);
431 break;
432 default:
433 /* NOT REACHED */
434 pr_err("unknown command\n");
435 break;
436 }
437 }
438 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
439
440 static void correct_endian_basic(struct usbip_header_basic *base, int send)
441 {
442 if (send) {
443 base->command = cpu_to_be32(base->command);
444 base->seqnum = cpu_to_be32(base->seqnum);
445 base->devid = cpu_to_be32(base->devid);
446 base->direction = cpu_to_be32(base->direction);
447 base->ep = cpu_to_be32(base->ep);
448 } else {
449 base->command = be32_to_cpu(base->command);
450 base->seqnum = be32_to_cpu(base->seqnum);
451 base->devid = be32_to_cpu(base->devid);
452 base->direction = be32_to_cpu(base->direction);
453 base->ep = be32_to_cpu(base->ep);
454 }
455 }
456
457 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
458 int send)
459 {
460 if (send) {
461 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
462
463 cpu_to_be32s(&pdu->transfer_buffer_length);
464 cpu_to_be32s(&pdu->start_frame);
465 cpu_to_be32s(&pdu->number_of_packets);
466 cpu_to_be32s(&pdu->interval);
467 } else {
468 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
469
470 be32_to_cpus(&pdu->transfer_buffer_length);
471 be32_to_cpus(&pdu->start_frame);
472 be32_to_cpus(&pdu->number_of_packets);
473 be32_to_cpus(&pdu->interval);
474 }
475 }
476
477 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
478 int send)
479 {
480 if (send) {
481 cpu_to_be32s(&pdu->status);
482 cpu_to_be32s(&pdu->actual_length);
483 cpu_to_be32s(&pdu->start_frame);
484 cpu_to_be32s(&pdu->number_of_packets);
485 cpu_to_be32s(&pdu->error_count);
486 } else {
487 be32_to_cpus(&pdu->status);
488 be32_to_cpus(&pdu->actual_length);
489 be32_to_cpus(&pdu->start_frame);
490 be32_to_cpus(&pdu->number_of_packets);
491 be32_to_cpus(&pdu->error_count);
492 }
493 }
494
495 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
496 int send)
497 {
498 if (send)
499 pdu->seqnum = cpu_to_be32(pdu->seqnum);
500 else
501 pdu->seqnum = be32_to_cpu(pdu->seqnum);
502 }
503
504 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
505 int send)
506 {
507 if (send)
508 cpu_to_be32s(&pdu->status);
509 else
510 be32_to_cpus(&pdu->status);
511 }
512
513 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
514 {
515 __u32 cmd = 0;
516
517 if (send)
518 cmd = pdu->base.command;
519
520 correct_endian_basic(&pdu->base, send);
521
522 if (!send)
523 cmd = pdu->base.command;
524
525 switch (cmd) {
526 case USBIP_CMD_SUBMIT:
527 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
528 break;
529 case USBIP_RET_SUBMIT:
530 correct_endian_ret_submit(&pdu->u.ret_submit, send);
531 break;
532 case USBIP_CMD_UNLINK:
533 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
534 break;
535 case USBIP_RET_UNLINK:
536 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
537 break;
538 default:
539 /* NOT REACHED */
540 pr_err("unknown command\n");
541 break;
542 }
543 }
544 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
545
546 static void usbip_iso_packet_correct_endian(
547 struct usbip_iso_packet_descriptor *iso, int send)
548 {
549 /* does not need all members. but copy all simply. */
550 if (send) {
551 iso->offset = cpu_to_be32(iso->offset);
552 iso->length = cpu_to_be32(iso->length);
553 iso->status = cpu_to_be32(iso->status);
554 iso->actual_length = cpu_to_be32(iso->actual_length);
555 } else {
556 iso->offset = be32_to_cpu(iso->offset);
557 iso->length = be32_to_cpu(iso->length);
558 iso->status = be32_to_cpu(iso->status);
559 iso->actual_length = be32_to_cpu(iso->actual_length);
560 }
561 }
562
563 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
564 struct usb_iso_packet_descriptor *uiso, int pack)
565 {
566 if (pack) {
567 iso->offset = uiso->offset;
568 iso->length = uiso->length;
569 iso->status = uiso->status;
570 iso->actual_length = uiso->actual_length;
571 } else {
572 uiso->offset = iso->offset;
573 uiso->length = iso->length;
574 uiso->status = iso->status;
575 uiso->actual_length = iso->actual_length;
576 }
577 }
578
579 /* must free buffer */
580 struct usbip_iso_packet_descriptor*
581 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
582 {
583 struct usbip_iso_packet_descriptor *iso;
584 int np = urb->number_of_packets;
585 ssize_t size = np * sizeof(*iso);
586 int i;
587
588 iso = kzalloc(size, GFP_KERNEL);
589 if (!iso)
590 return NULL;
591
592 for (i = 0; i < np; i++) {
593 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1);
594 usbip_iso_packet_correct_endian(&iso[i], 1);
595 }
596
597 *bufflen = size;
598
599 return iso;
600 }
601 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
602
603 /* some members of urb must be substituted before. */
604 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
605 {
606 void *buff;
607 struct usbip_iso_packet_descriptor *iso;
608 int np = urb->number_of_packets;
609 int size = np * sizeof(*iso);
610 int i;
611 int ret;
612 int total_length = 0;
613
614 if (!usb_pipeisoc(urb->pipe))
615 return 0;
616
617 /* my Bluetooth dongle gets ISO URBs which are np = 0 */
618 if (np == 0)
619 return 0;
620
621 buff = kzalloc(size, GFP_KERNEL);
622 if (!buff)
623 return -ENOMEM;
624
625 ret = usbip_recv(ud->tcp_socket, buff, size);
626 if (ret != size) {
627 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
628 ret);
629 kfree(buff);
630
631 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
632 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
633 else
634 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
635
636 return -EPIPE;
637 }
638
639 iso = (struct usbip_iso_packet_descriptor *) buff;
640 for (i = 0; i < np; i++) {
641 usbip_iso_packet_correct_endian(&iso[i], 0);
642 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0);
643 total_length += urb->iso_frame_desc[i].actual_length;
644 }
645
646 kfree(buff);
647
648 if (total_length != urb->actual_length) {
649 dev_err(&urb->dev->dev,
650 "total length of iso packets %d not equal to actual length of buffer %d\n",
651 total_length, urb->actual_length);
652
653 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC)
654 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
655 else
656 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
657
658 return -EPIPE;
659 }
660
661 return ret;
662 }
663 EXPORT_SYMBOL_GPL(usbip_recv_iso);
664
665 /*
666 * This functions restores the padding which was removed for optimizing
667 * the bandwidth during transfer over tcp/ip
668 *
669 * buffer and iso packets need to be stored and be in propeper endian in urb
670 * before calling this function
671 */
672 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
673 {
674 int np = urb->number_of_packets;
675 int i;
676 int actualoffset = urb->actual_length;
677
678 if (!usb_pipeisoc(urb->pipe))
679 return;
680
681 /* if no packets or length of data is 0, then nothing to unpack */
682 if (np == 0 || urb->actual_length == 0)
683 return;
684
685 /*
686 * if actual_length is transfer_buffer_length then no padding is
687 * present.
688 */
689 if (urb->actual_length == urb->transfer_buffer_length)
690 return;
691
692 /*
693 * loop over all packets from last to first (to prevent overwritting
694 * memory when padding) and move them into the proper place
695 */
696 for (i = np-1; i > 0; i--) {
697 actualoffset -= urb->iso_frame_desc[i].actual_length;
698 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
699 urb->transfer_buffer + actualoffset,
700 urb->iso_frame_desc[i].actual_length);
701 }
702 }
703 EXPORT_SYMBOL_GPL(usbip_pad_iso);
704
705 /* some members of urb must be substituted before. */
706 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
707 {
708 int ret;
709 int size;
710
711 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
712 /* the direction of urb must be OUT. */
713 if (usb_pipein(urb->pipe))
714 return 0;
715
716 size = urb->transfer_buffer_length;
717 } else {
718 /* the direction of urb must be IN. */
719 if (usb_pipeout(urb->pipe))
720 return 0;
721
722 size = urb->actual_length;
723 }
724
725 /* no need to recv xbuff */
726 if (!(size > 0))
727 return 0;
728
729 if (size > urb->transfer_buffer_length) {
730 /* should not happen, probably malicious packet */
731 if (ud->side == USBIP_STUB) {
732 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
733 return 0;
734 } else {
735 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
736 return -EPIPE;
737 }
738 }
739
740 ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
741 if (ret != size) {
742 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
743 if (ud->side == USBIP_STUB || ud->side == USBIP_VUDC) {
744 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
745 } else {
746 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
747 return -EPIPE;
748 }
749 }
750
751 return ret;
752 }
753 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
754
755 static int __init usbip_core_init(void)
756 {
757 int ret;
758
759 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
760 ret = usbip_init_eh();
761 if (ret)
762 return ret;
763
764 return 0;
765 }
766
767 static void __exit usbip_core_exit(void)
768 {
769 usbip_finish_eh();
770 return;
771 }
772
773 module_init(usbip_core_init);
774 module_exit(usbip_core_exit);
775
776 MODULE_AUTHOR(DRIVER_AUTHOR);
777 MODULE_DESCRIPTION(DRIVER_DESC);
778 MODULE_LICENSE("GPL");
779 MODULE_VERSION(USBIP_VERSION);
Linux with added FPC-III support