Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/staging/usbip/usbip_common.c

  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 
 20 #include <asm/byteorder.h>
 21 #include <linux/file.h>
 22 #include <linux/fs.h>
 23 #include <linux/kernel.h>
 24 #include <linux/slab.h>
 25 #include <linux/module.h>
 26 #include <net/sock.h>
 27 
 28 #include "usbip_common.h"
 29 
 30 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
 31 #define DRIVER_DESC "USB/IP Core"
 32 
 33 #ifdef CONFIG_USBIP_DEBUG
 34 unsigned long usbip_debug_flag = 0xffffffff;
 35 #else
 36 unsigned long usbip_debug_flag;
 37 #endif
 38 EXPORT_SYMBOL_GPL(usbip_debug_flag);
 39 
 40 /* FIXME */
 41 struct device_attribute dev_attr_usbip_debug;
 42 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
 43 
 44 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
 45                          char *buf)
 46 {
 47         return sprintf(buf, "%lx\n", usbip_debug_flag);
 48 }
 49 
 50 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
 51                           const char *buf, size_t count)
 52 {
 53         sscanf(buf, "%lx", &usbip_debug_flag);
 54         return count;
 55 }
 56 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
 57 
 58 static void usbip_dump_buffer(char *buff, int bufflen)
 59 {
 60         print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
 61                        buff, bufflen, false);
 62 }
 63 
 64 static void usbip_dump_pipe(unsigned int p)
 65 {
 66         unsigned char type = usb_pipetype(p);
 67         unsigned char ep   = usb_pipeendpoint(p);
 68         unsigned char dev  = usb_pipedevice(p);
 69         unsigned char dir  = usb_pipein(p);
 70 
 71         pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
 72 
 73         switch (type) {
 74         case PIPE_ISOCHRONOUS:
 75                 pr_debug("ISO\n");
 76                 break;
 77         case PIPE_INTERRUPT:
 78                 pr_debug("INT\n");
 79                 break;
 80         case PIPE_CONTROL:
 81                 pr_debug("CTRL\n");
 82                 break;
 83         case PIPE_BULK:
 84                 pr_debug("BULK\n");
 85                 break;
 86         default:
 87                 pr_debug("ERR\n");
 88                 break;
 89         }
 90 }
 91 
 92 static void usbip_dump_usb_device(struct usb_device *udev)
 93 {
 94         struct device *dev = &udev->dev;
 95         int i;
 96 
 97         dev_dbg(dev, "       devnum(%d) devpath(%s) ",
 98                 udev->devnum, udev->devpath);
 99 
100         switch (udev->speed) {
101         case USB_SPEED_HIGH:
102                 pr_debug("SPD_HIGH ");
103                 break;
104         case USB_SPEED_FULL:
105                 pr_debug("SPD_FULL ");
106                 break;
107         case USB_SPEED_LOW:
108                 pr_debug("SPD_LOW ");
109                 break;
110         case USB_SPEED_UNKNOWN:
111                 pr_debug("SPD_UNKNOWN ");
112                 break;
113         default:
114                 pr_debug("SPD_ERROR ");
115                 break;
116         }
117 
118         pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
119 
120         dev_dbg(dev, "                    ");
121         for (i = 0; i < 16; i++)
122                 pr_debug(" %2u", i);
123         pr_debug("\n");
124 
125         dev_dbg(dev, "       toggle0(IN) :");
126         for (i = 0; i < 16; i++)
127                 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
128         pr_debug("\n");
129 
130         dev_dbg(dev, "       toggle1(OUT):");
131         for (i = 0; i < 16; i++)
132                 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
133         pr_debug("\n");
134 
135         dev_dbg(dev, "       epmaxp_in   :");
136         for (i = 0; i < 16; i++) {
137                 if (udev->ep_in[i])
138                         pr_debug(" %2u",
139                             le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
140         }
141         pr_debug("\n");
142 
143         dev_dbg(dev, "       epmaxp_out  :");
144         for (i = 0; i < 16; i++) {
145                 if (udev->ep_out[i])
146                         pr_debug(" %2u",
147                             le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
148         }
149         pr_debug("\n");
150 
151         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
152 
153         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
154                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
155                 udev->actconfig, udev->rawdescriptors);
156 
157         dev_dbg(dev, "have_langid %d, string_langid %d\n",
158                 udev->have_langid, udev->string_langid);
159 
160         dev_dbg(dev, "maxchild %d, children %p\n",
161                 udev->maxchild, udev->children);
162 }
163 
164 static void usbip_dump_request_type(__u8 rt)
165 {
166         switch (rt & USB_RECIP_MASK) {
167         case USB_RECIP_DEVICE:
168                 pr_debug("DEVICE");
169                 break;
170         case USB_RECIP_INTERFACE:
171                 pr_debug("INTERF");
172                 break;
173         case USB_RECIP_ENDPOINT:
174                 pr_debug("ENDPOI");
175                 break;
176         case USB_RECIP_OTHER:
177                 pr_debug("OTHER ");
178                 break;
179         default:
180                 pr_debug("------");
181                 break;
182         }
183 }
184 
185 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
186 {
187         if (!cmd) {
188                 pr_debug("       : null pointer\n");
189                 return;
190         }
191 
192         pr_debug("       ");
193         pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
194                  "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
195                  cmd->wValue, cmd->wIndex, cmd->wLength);
196         pr_debug("\n       ");
197 
198         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
199                 pr_debug("STANDARD ");
200                 switch (cmd->bRequest) {
201                 case USB_REQ_GET_STATUS:
202                         pr_debug("GET_STATUS\n");
203                         break;
204                 case USB_REQ_CLEAR_FEATURE:
205                         pr_debug("CLEAR_FEAT\n");
206                         break;
207                 case USB_REQ_SET_FEATURE:
208                         pr_debug("SET_FEAT\n");
209                         break;
210                 case USB_REQ_SET_ADDRESS:
211                         pr_debug("SET_ADDRRS\n");
212                         break;
213                 case USB_REQ_GET_DESCRIPTOR:
214                         pr_debug("GET_DESCRI\n");
215                         break;
216                 case USB_REQ_SET_DESCRIPTOR:
217                         pr_debug("SET_DESCRI\n");
218                         break;
219                 case USB_REQ_GET_CONFIGURATION:
220                         pr_debug("GET_CONFIG\n");
221                         break;
222                 case USB_REQ_SET_CONFIGURATION:
223                         pr_debug("SET_CONFIG\n");
224                         break;
225                 case USB_REQ_GET_INTERFACE:
226                         pr_debug("GET_INTERF\n");
227                         break;
228                 case USB_REQ_SET_INTERFACE:
229                         pr_debug("SET_INTERF\n");
230                         break;
231                 case USB_REQ_SYNCH_FRAME:
232                         pr_debug("SYNC_FRAME\n");
233                         break;
234                 default:
235                         pr_debug("REQ(%02X)\n", cmd->bRequest);
236                         break;
237                 }
238                 usbip_dump_request_type(cmd->bRequestType);
239         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
240                 pr_debug("CLASS\n");
241         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
242                 pr_debug("VENDOR\n");
243         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
244                 pr_debug("RESERVED\n");
245         }
246 }
247 
248 void usbip_dump_urb(struct urb *urb)
249 {
250         struct device *dev;
251 
252         if (!urb) {
253                 pr_debug("urb: null pointer!!\n");
254                 return;
255         }
256 
257         if (!urb->dev) {
258                 pr_debug("urb->dev: null pointer!!\n");
259                 return;
260         }
261 
262         dev = &urb->dev->dev;
263 
264         dev_dbg(dev, "   urb                   :%p\n", urb);
265         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
266 
267         usbip_dump_usb_device(urb->dev);
268 
269         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
270 
271         usbip_dump_pipe(urb->pipe);
272 
273         dev_dbg(dev, "   status                :%d\n", urb->status);
274         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
275         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
276         dev_dbg(dev, "   transfer_buffer_length:%d\n",
277                                                 urb->transfer_buffer_length);
278         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
279         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
280 
281         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
282                 usbip_dump_usb_ctrlrequest(
283                         (struct usb_ctrlrequest *)urb->setup_packet);
284 
285         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
286         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
287         dev_dbg(dev, "   interval              :%d\n", urb->interval);
288         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
289         dev_dbg(dev, "   context               :%p\n", urb->context);
290         dev_dbg(dev, "   complete              :%p\n", urb->complete);
291 }
292 EXPORT_SYMBOL_GPL(usbip_dump_urb);
293 
294 void usbip_dump_header(struct usbip_header *pdu)
295 {
296         pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
297                  pdu->base.command,
298                  pdu->base.seqnum,
299                  pdu->base.devid,
300                  pdu->base.direction,
301                  pdu->base.ep);
302 
303         switch (pdu->base.command) {
304         case USBIP_CMD_SUBMIT:
305                 pr_debug("USBIP_CMD_SUBMIT: "
306                          "x_flags %u x_len %u sf %u #p %d iv %d\n",
307                          pdu->u.cmd_submit.transfer_flags,
308                          pdu->u.cmd_submit.transfer_buffer_length,
309                          pdu->u.cmd_submit.start_frame,
310                          pdu->u.cmd_submit.number_of_packets,
311                          pdu->u.cmd_submit.interval);
312                 break;
313         case USBIP_CMD_UNLINK:
314                 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
315                          pdu->u.cmd_unlink.seqnum);
316                 break;
317         case USBIP_RET_SUBMIT:
318                 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
319                          pdu->u.ret_submit.status,
320                          pdu->u.ret_submit.actual_length,
321                          pdu->u.ret_submit.start_frame,
322                          pdu->u.ret_submit.number_of_packets,
323                          pdu->u.ret_submit.error_count);
324                 break;
325         case USBIP_RET_UNLINK:
326                 pr_debug("USBIP_RET_UNLINK: status %d\n",
327                          pdu->u.ret_unlink.status);
328                 break;
329         default:
330                 /* NOT REACHED */
331                 pr_err("unknown command\n");
332                 break;
333         }
334 }
335 EXPORT_SYMBOL_GPL(usbip_dump_header);
336 
337 /* Receive data over TCP/IP. */
338 int usbip_recv(struct socket *sock, void *buf, int size)
339 {
340         int result;
341         struct msghdr msg;
342         struct kvec iov;
343         int total = 0;
344 
345         /* for blocks of if (usbip_dbg_flag_xmit) */
346         char *bp = buf;
347         int osize = size;
348 
349         usbip_dbg_xmit("enter\n");
350 
351         if (!sock || !buf || !size) {
352                 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
353                        size);
354                 return -EINVAL;
355         }
356 
357         do {
358                 sock->sk->sk_allocation = GFP_NOIO;
359                 iov.iov_base    = buf;
360                 iov.iov_len     = size;
361                 msg.msg_name    = NULL;
362                 msg.msg_namelen = 0;
363                 msg.msg_control = NULL;
364                 msg.msg_controllen = 0;
365                 msg.msg_namelen    = 0;
366                 msg.msg_flags      = MSG_NOSIGNAL;
367 
368                 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
369                 if (result <= 0) {
370                         pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
371                                  sock, buf, size, result, total);
372                         goto err;
373                 }
374 
375                 size -= result;
376                 buf += result;
377                 total += result;
378         } while (size > 0);
379 
380         if (usbip_dbg_flag_xmit) {
381                 if (!in_interrupt())
382                         pr_debug("%-10s:", current->comm);
383                 else
384                         pr_debug("interrupt  :");
385 
386                 pr_debug("receiving....\n");
387                 usbip_dump_buffer(bp, osize);
388                 pr_debug("received, osize %d ret %d size %d total %d\n",
389                         osize, result, size, total);
390         }
391 
392         return total;
393 
394 err:
395         return result;
396 }
397 EXPORT_SYMBOL_GPL(usbip_recv);
398 
399 struct socket *sockfd_to_socket(unsigned int sockfd)
400 {
401         struct socket *socket;
402         struct file *file;
403         struct inode *inode;
404 
405         file = fget(sockfd);
406         if (!file) {
407                 pr_err("invalid sockfd\n");
408                 return NULL;
409         }
410 
411         inode = file->f_dentry->d_inode;
412 
413         if (!inode || !S_ISSOCK(inode->i_mode))
414                 return NULL;
415 
416         socket = SOCKET_I(inode);
417 
418         return socket;
419 }
420 EXPORT_SYMBOL_GPL(sockfd_to_socket);
421 
422 /* there may be more cases to tweak the flags. */
423 static unsigned int tweak_transfer_flags(unsigned int flags)
424 {
425         flags &= ~URB_NO_TRANSFER_DMA_MAP;
426         return flags;
427 }
428 
429 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
430                                   int pack)
431 {
432         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
433 
434         /*
435          * Some members are not still implemented in usbip. I hope this issue
436          * will be discussed when usbip is ported to other operating systems.
437          */
438         if (pack) {
439                 /* vhci_tx.c */
440                 spdu->transfer_flags =
441                         tweak_transfer_flags(urb->transfer_flags);
442                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
443                 spdu->start_frame               = urb->start_frame;
444                 spdu->number_of_packets         = urb->number_of_packets;
445                 spdu->interval                  = urb->interval;
446         } else  {
447                 /* stub_rx.c */
448                 urb->transfer_flags         = spdu->transfer_flags;
449 
450                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
451                 urb->start_frame            = spdu->start_frame;
452                 urb->number_of_packets      = spdu->number_of_packets;
453                 urb->interval               = spdu->interval;
454         }
455 }
456 
457 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
458                                   int pack)
459 {
460         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
461 
462         if (pack) {
463                 /* stub_tx.c */
464 
465                 rpdu->status            = urb->status;
466                 rpdu->actual_length     = urb->actual_length;
467                 rpdu->start_frame       = urb->start_frame;
468                 rpdu->number_of_packets = urb->number_of_packets;
469                 rpdu->error_count       = urb->error_count;
470         } else {
471                 /* vhci_rx.c */
472 
473                 urb->status             = rpdu->status;
474                 urb->actual_length      = rpdu->actual_length;
475                 urb->start_frame        = rpdu->start_frame;
476                 urb->number_of_packets = rpdu->number_of_packets;
477                 urb->error_count        = rpdu->error_count;
478         }
479 }
480 
481 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
482                     int pack)
483 {
484         switch (cmd) {
485         case USBIP_CMD_SUBMIT:
486                 usbip_pack_cmd_submit(pdu, urb, pack);
487                 break;
488         case USBIP_RET_SUBMIT:
489                 usbip_pack_ret_submit(pdu, urb, pack);
490                 break;
491         default:
492                 /* NOT REACHED */
493                 pr_err("unknown command\n");
494                 break;
495         }
496 }
497 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
498 
499 static void correct_endian_basic(struct usbip_header_basic *base, int send)
500 {
501         if (send) {
502                 base->command   = cpu_to_be32(base->command);
503                 base->seqnum    = cpu_to_be32(base->seqnum);
504                 base->devid     = cpu_to_be32(base->devid);
505                 base->direction = cpu_to_be32(base->direction);
506                 base->ep        = cpu_to_be32(base->ep);
507         } else {
508                 base->command   = be32_to_cpu(base->command);
509                 base->seqnum    = be32_to_cpu(base->seqnum);
510                 base->devid     = be32_to_cpu(base->devid);
511                 base->direction = be32_to_cpu(base->direction);
512                 base->ep        = be32_to_cpu(base->ep);
513         }
514 }
515 
516 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
517                                       int send)
518 {
519         if (send) {
520                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
521 
522                 cpu_to_be32s(&pdu->transfer_buffer_length);
523                 cpu_to_be32s(&pdu->start_frame);
524                 cpu_to_be32s(&pdu->number_of_packets);
525                 cpu_to_be32s(&pdu->interval);
526         } else {
527                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
528 
529                 be32_to_cpus(&pdu->transfer_buffer_length);
530                 be32_to_cpus(&pdu->start_frame);
531                 be32_to_cpus(&pdu->number_of_packets);
532                 be32_to_cpus(&pdu->interval);
533         }
534 }
535 
536 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
537                                       int send)
538 {
539         if (send) {
540                 cpu_to_be32s(&pdu->status);
541                 cpu_to_be32s(&pdu->actual_length);
542                 cpu_to_be32s(&pdu->start_frame);
543                 cpu_to_be32s(&pdu->number_of_packets);
544                 cpu_to_be32s(&pdu->error_count);
545         } else {
546                 be32_to_cpus(&pdu->status);
547                 be32_to_cpus(&pdu->actual_length);
548                 be32_to_cpus(&pdu->start_frame);
549                 be32_to_cpus(&pdu->number_of_packets);
550                 be32_to_cpus(&pdu->error_count);
551         }
552 }
553 
554 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
555                                       int send)
556 {
557         if (send)
558                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
559         else
560                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
561 }
562 
563 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
564                                       int send)
565 {
566         if (send)
567                 cpu_to_be32s(&pdu->status);
568         else
569                 be32_to_cpus(&pdu->status);
570 }
571 
572 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
573 {
574         __u32 cmd = 0;
575 
576         if (send)
577                 cmd = pdu->base.command;
578 
579         correct_endian_basic(&pdu->base, send);
580 
581         if (!send)
582                 cmd = pdu->base.command;
583 
584         switch (cmd) {
585         case USBIP_CMD_SUBMIT:
586                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
587                 break;
588         case USBIP_RET_SUBMIT:
589                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
590                 break;
591         case USBIP_CMD_UNLINK:
592                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
593                 break;
594         case USBIP_RET_UNLINK:
595                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
596                 break;
597         default:
598                 /* NOT REACHED */
599                 pr_err("unknown command\n");
600                 break;
601         }
602 }
603 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
604 
605 static void usbip_iso_packet_correct_endian(
606                 struct usbip_iso_packet_descriptor *iso, int send)
607 {
608         /* does not need all members. but copy all simply. */
609         if (send) {
610                 iso->offset     = cpu_to_be32(iso->offset);
611                 iso->length     = cpu_to_be32(iso->length);
612                 iso->status     = cpu_to_be32(iso->status);
613                 iso->actual_length = cpu_to_be32(iso->actual_length);
614         } else {
615                 iso->offset     = be32_to_cpu(iso->offset);
616                 iso->length     = be32_to_cpu(iso->length);
617                 iso->status     = be32_to_cpu(iso->status);
618                 iso->actual_length = be32_to_cpu(iso->actual_length);
619         }
620 }
621 
622 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
623                            struct usb_iso_packet_descriptor *uiso, int pack)
624 {
625         if (pack) {
626                 iso->offset             = uiso->offset;
627                 iso->length             = uiso->length;
628                 iso->status             = uiso->status;
629                 iso->actual_length      = uiso->actual_length;
630         } else {
631                 uiso->offset            = iso->offset;
632                 uiso->length            = iso->length;
633                 uiso->status            = iso->status;
634                 uiso->actual_length     = iso->actual_length;
635         }
636 }
637 
638 /* must free buffer */
639 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
640 {
641         void *buff;
642         struct usbip_iso_packet_descriptor *iso;
643         int np = urb->number_of_packets;
644         ssize_t size = np * sizeof(*iso);
645         int i;
646 
647         buff = kzalloc(size, GFP_KERNEL);
648         if (!buff)
649                 return NULL;
650 
651         for (i = 0; i < np; i++) {
652                 iso = buff + (i * sizeof(*iso));
653 
654                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
655                 usbip_iso_packet_correct_endian(iso, 1);
656         }
657 
658         *bufflen = size;
659 
660         return buff;
661 }
662 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
663 
664 /* some members of urb must be substituted before. */
665 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
666 {
667         void *buff;
668         struct usbip_iso_packet_descriptor *iso;
669         int np = urb->number_of_packets;
670         int size = np * sizeof(*iso);
671         int i;
672         int ret;
673         int total_length = 0;
674 
675         if (!usb_pipeisoc(urb->pipe))
676                 return 0;
677 
678         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
679         if (np == 0) {
680                 /* pr_info("iso np == 0\n"); */
681                 /* usbip_dump_urb(urb); */
682                 return 0;
683         }
684 
685         buff = kzalloc(size, GFP_KERNEL);
686         if (!buff)
687                 return -ENOMEM;
688 
689         ret = usbip_recv(ud->tcp_socket, buff, size);
690         if (ret != size) {
691                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
692                         ret);
693                 kfree(buff);
694 
695                 if (ud->side == USBIP_STUB)
696                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
697                 else
698                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
699 
700                 return -EPIPE;
701         }
702 
703         for (i = 0; i < np; i++) {
704                 iso = buff + (i * sizeof(*iso));
705 
706                 usbip_iso_packet_correct_endian(iso, 0);
707                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
708                 total_length += urb->iso_frame_desc[i].actual_length;
709         }
710 
711         kfree(buff);
712 
713         if (total_length != urb->actual_length) {
714                 dev_err(&urb->dev->dev,
715                         "total length of iso packets %d not equal to actual "
716                         "length of buffer %d\n",
717                         total_length, urb->actual_length);
718 
719                 if (ud->side == USBIP_STUB)
720                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
721                 else
722                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
723 
724                 return -EPIPE;
725         }
726 
727         return ret;
728 }
729 EXPORT_SYMBOL_GPL(usbip_recv_iso);
730 
731 /*
732  * This functions restores the padding which was removed for optimizing
733  * the bandwidth during transfer over tcp/ip
734  *
735  * buffer and iso packets need to be stored and be in propeper endian in urb
736  * before calling this function
737  */
738 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
739 {
740         int np = urb->number_of_packets;
741         int i;
742         int actualoffset = urb->actual_length;
743 
744         if (!usb_pipeisoc(urb->pipe))
745                 return;
746 
747         /* if no packets or length of data is 0, then nothing to unpack */
748         if (np == 0 || urb->actual_length == 0)
749                 return;
750 
751         /*
752          * if actual_length is transfer_buffer_length then no padding is
753          * present.
754         */
755         if (urb->actual_length == urb->transfer_buffer_length)
756                 return;
757 
758         /*
759          * loop over all packets from last to first (to prevent overwritting
760          * memory when padding) and move them into the proper place
761          */
762         for (i = np-1; i > 0; i--) {
763                 actualoffset -= urb->iso_frame_desc[i].actual_length;
764                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
765                         urb->transfer_buffer + actualoffset,
766                         urb->iso_frame_desc[i].actual_length);
767         }
768 }
769 EXPORT_SYMBOL_GPL(usbip_pad_iso);
770 
771 /* some members of urb must be substituted before. */
772 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
773 {
774         int ret;
775         int size;
776 
777         if (ud->side == USBIP_STUB) {
778                 /* stub_rx.c */
779                 /* the direction of urb must be OUT. */
780                 if (usb_pipein(urb->pipe))
781                         return 0;
782 
783                 size = urb->transfer_buffer_length;
784         } else {
785                 /* vhci_rx.c */
786                 /* the direction of urb must be IN. */
787                 if (usb_pipeout(urb->pipe))
788                         return 0;
789 
790                 size = urb->actual_length;
791         }
792 
793         /* no need to recv xbuff */
794         if (!(size > 0))
795                 return 0;
796 
797         ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
798         if (ret != size) {
799                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
800                 if (ud->side == USBIP_STUB) {
801                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
802                 } else {
803                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
804                         return -EPIPE;
805                 }
806         }
807 
808         return ret;
809 }
810 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
811 
812 static int __init usbip_core_init(void)
813 {
814         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
815         return 0;
816 }
817 
818 static void __exit usbip_core_exit(void)
819 {
820         return;
821 }
822 
823 module_init(usbip_core_init);
824 module_exit(usbip_core_exit);
825 
826 MODULE_AUTHOR(DRIVER_AUTHOR);
827 MODULE_DESCRIPTION(DRIVER_DESC);
828 MODULE_LICENSE("GPL");
829 MODULE_VERSION(USBIP_VERSION);
830 

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