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