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/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 <hirofuchi@users.sourceforge.net>"
  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         sscanf(buf, "%lx", &usbip_debug_flag);
  59         return count;
  60 }
  61 DEVICE_ATTR_RW(usbip_debug);
  62
  63 static void usbip_dump_buffer(char *buff, int bufflen)
  64 {
  65         print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
  66                        buff, bufflen, false);
  67 }
  68
  69 static void usbip_dump_pipe(unsigned int p)
  70 {
  71         unsigned char type = usb_pipetype(p);
  72         unsigned char ep   = usb_pipeendpoint(p);
  73         unsigned char dev  = usb_pipedevice(p);
  74         unsigned char dir  = usb_pipein(p);
  75
  76         pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
  77
  78         switch (type) {
  79         case PIPE_ISOCHRONOUS:
  80                 pr_debug("ISO\n");
  81                 break;
  82         case PIPE_INTERRUPT:
  83                 pr_debug("INT\n");
  84                 break;
  85         case PIPE_CONTROL:
  86                 pr_debug("CTRL\n");
  87                 break;
  88         case PIPE_BULK:
  89                 pr_debug("BULK\n");
  90                 break;
  91         default:
  92                 pr_debug("ERR\n");
  93                 break;
  94         }
  95 }
  96
  97 static void usbip_dump_usb_device(struct usb_device *udev)
  98 {
  99         struct device *dev = &udev->dev;
 100         int i;
 101
 102         dev_dbg(dev, "       devnum(%d) devpath(%s) ",
 103                 udev->devnum, udev->devpath);
 104
 105         switch (udev->speed) {
 106         case USB_SPEED_HIGH:
 107                 pr_debug("SPD_HIGH ");
 108                 break;
 109         case USB_SPEED_FULL:
 110                 pr_debug("SPD_FULL ");
 111                 break;
 112         case USB_SPEED_LOW:
 113                 pr_debug("SPD_LOW ");
 114                 break;
 115         case USB_SPEED_UNKNOWN:
 116                 pr_debug("SPD_UNKNOWN ");
 117                 break;
 118         default:
 119                 pr_debug("SPD_ERROR ");
 120                 break;
 121         }
 122
 123         pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
 124
 125         dev_dbg(dev, "                    ");
 126         for (i = 0; i < 16; i++)
 127                 pr_debug(" %2u", i);
 128         pr_debug("\n");
 129
 130         dev_dbg(dev, "       toggle0(IN) :");
 131         for (i = 0; i < 16; i++)
 132                 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 133         pr_debug("\n");
 134
 135         dev_dbg(dev, "       toggle1(OUT):");
 136         for (i = 0; i < 16; i++)
 137                 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 138         pr_debug("\n");
 139
 140         dev_dbg(dev, "       epmaxp_in   :");
 141         for (i = 0; i < 16; i++) {
 142                 if (udev->ep_in[i])
 143                         pr_debug(" %2u",
 144                             le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 145         }
 146         pr_debug("\n");
 147
 148         dev_dbg(dev, "       epmaxp_out  :");
 149         for (i = 0; i < 16; i++) {
 150                 if (udev->ep_out[i])
 151                         pr_debug(" %2u",
 152                             le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 153         }
 154         pr_debug("\n");
 155
 156         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 157
 158         dev_dbg(dev,
 159                 "descriptor %p, config %p, actconfig %p, rawdescriptors %p\n",
 160                 &udev->descriptor, udev->config,
 161                 udev->actconfig, udev->rawdescriptors);
 162
 163         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 164                 udev->have_langid, udev->string_langid);
 165
 166         dev_dbg(dev, "maxchild %d\n", udev->maxchild);
 167 }
 168
 169 static void usbip_dump_request_type(__u8 rt)
 170 {
 171         switch (rt & USB_RECIP_MASK) {
 172         case USB_RECIP_DEVICE:
 173                 pr_debug("DEVICE");
 174                 break;
 175         case USB_RECIP_INTERFACE:
 176                 pr_debug("INTERF");
 177                 break;
 178         case USB_RECIP_ENDPOINT:
 179                 pr_debug("ENDPOI");
 180                 break;
 181         case USB_RECIP_OTHER:
 182                 pr_debug("OTHER ");
 183                 break;
 184         default:
 185                 pr_debug("------");
 186                 break;
 187         }
 188 }
 189
 190 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 191 {
 192         if (!cmd) {
 193                 pr_debug("       : null pointer\n");
 194                 return;
 195         }
 196
 197         pr_debug("       ");
 198         pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
 199                  "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
 200                  cmd->wValue, cmd->wIndex, cmd->wLength);
 201         pr_debug("\n       ");
 202
 203         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 204                 pr_debug("STANDARD ");
 205                 switch (cmd->bRequest) {
 206                 case USB_REQ_GET_STATUS:
 207                         pr_debug("GET_STATUS\n");
 208                         break;
 209                 case USB_REQ_CLEAR_FEATURE:
 210                         pr_debug("CLEAR_FEAT\n");
 211                         break;
 212                 case USB_REQ_SET_FEATURE:
 213                         pr_debug("SET_FEAT\n");
 214                         break;
 215                 case USB_REQ_SET_ADDRESS:
 216                         pr_debug("SET_ADDRRS\n");
 217                         break;
 218                 case USB_REQ_GET_DESCRIPTOR:
 219                         pr_debug("GET_DESCRI\n");
 220                         break;
 221                 case USB_REQ_SET_DESCRIPTOR:
 222                         pr_debug("SET_DESCRI\n");
 223                         break;
 224                 case USB_REQ_GET_CONFIGURATION:
 225                         pr_debug("GET_CONFIG\n");
 226                         break;
 227                 case USB_REQ_SET_CONFIGURATION:
 228                         pr_debug("SET_CONFIG\n");
 229                         break;
 230                 case USB_REQ_GET_INTERFACE:
 231                         pr_debug("GET_INTERF\n");
 232                         break;
 233                 case USB_REQ_SET_INTERFACE:
 234                         pr_debug("SET_INTERF\n");
 235                         break;
 236                 case USB_REQ_SYNCH_FRAME:
 237                         pr_debug("SYNC_FRAME\n");
 238                         break;
 239                 default:
 240                         pr_debug("REQ(%02X)\n", cmd->bRequest);
 241                         break;
 242                 }
 243                 usbip_dump_request_type(cmd->bRequestType);
 244         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
 245                 pr_debug("CLASS\n");
 246         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
 247                 pr_debug("VENDOR\n");
 248         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
 249                 pr_debug("RESERVED\n");
 250         }
 251 }
 252
 253 void usbip_dump_urb(struct urb *urb)
 254 {
 255         struct device *dev;
 256
 257         if (!urb) {
 258                 pr_debug("urb: null pointer!!\n");
 259                 return;
 260         }
 261
 262         if (!urb->dev) {
 263                 pr_debug("urb->dev: null pointer!!\n");
 264                 return;
 265         }
 266
 267         dev = &urb->dev->dev;
 268
 269         dev_dbg(dev, "   urb                   :%p\n", urb);
 270         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 271
 272         usbip_dump_usb_device(urb->dev);
 273
 274         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 275
 276         usbip_dump_pipe(urb->pipe);
 277
 278         dev_dbg(dev, "   status                :%d\n", urb->status);
 279         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 280         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 281         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 282                                                 urb->transfer_buffer_length);
 283         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 284         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 285
 286         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 287                 usbip_dump_usb_ctrlrequest(
 288                         (struct usb_ctrlrequest *)urb->setup_packet);
 289
 290         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 291         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 292         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 293         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 294         dev_dbg(dev, "   context               :%p\n", urb->context);
 295         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 296 }
 297 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 298
 299 void usbip_dump_header(struct usbip_header *pdu)
 300 {
 301         pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 302                  pdu->base.command,
 303                  pdu->base.seqnum,
 304                  pdu->base.devid,
 305                  pdu->base.direction,
 306                  pdu->base.ep);
 307
 308         switch (pdu->base.command) {
 309         case USBIP_CMD_SUBMIT:
 310                 pr_debug("USBIP_CMD_SUBMIT: "
 311                          "x_flags %u x_len %u sf %u #p %d iv %d\n",
 312                          pdu->u.cmd_submit.transfer_flags,
 313                          pdu->u.cmd_submit.transfer_buffer_length,
 314                          pdu->u.cmd_submit.start_frame,
 315                          pdu->u.cmd_submit.number_of_packets,
 316                          pdu->u.cmd_submit.interval);
 317                 break;
 318         case USBIP_CMD_UNLINK:
 319                 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
 320                          pdu->u.cmd_unlink.seqnum);
 321                 break;
 322         case USBIP_RET_SUBMIT:
 323                 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
 324                          pdu->u.ret_submit.status,
 325                          pdu->u.ret_submit.actual_length,
 326                          pdu->u.ret_submit.start_frame,
 327                          pdu->u.ret_submit.number_of_packets,
 328                          pdu->u.ret_submit.error_count);
 329                 break;
 330         case USBIP_RET_UNLINK:
 331                 pr_debug("USBIP_RET_UNLINK: status %d\n",
 332                          pdu->u.ret_unlink.status);
 333                 break;
 334         default:
 335                 /* NOT REACHED */
 336                 pr_err("unknown command\n");
 337                 break;
 338         }
 339 }
 340 EXPORT_SYMBOL_GPL(usbip_dump_header);
 341
 342 /* Receive data over TCP/IP. */
 343 int usbip_recv(struct socket *sock, void *buf, int size)
 344 {
 345         int result;
 346         struct msghdr msg;
 347         struct kvec iov;
 348         int total = 0;
 349
 350         /* for blocks of if (usbip_dbg_flag_xmit) */
 351         char *bp = buf;
 352         int osize = size;
 353
 354         usbip_dbg_xmit("enter\n");
 355
 356         if (!sock || !buf || !size) {
 357                 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
 358                        size);
 359                 return -EINVAL;
 360         }
 361
 362         do {
 363                 sock->sk->sk_allocation = GFP_NOIO;
 364                 iov.iov_base    = buf;
 365                 iov.iov_len     = size;
 366                 msg.msg_name    = NULL;
 367                 msg.msg_namelen = 0;
 368                 msg.msg_control = NULL;
 369                 msg.msg_controllen = 0;
 370                 msg.msg_namelen    = 0;
 371                 msg.msg_flags      = MSG_NOSIGNAL;
 372
 373                 result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
 374                 if (result <= 0) {
 375                         pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
 376                                  sock, buf, size, result, total);
 377                         goto err;
 378                 }
 379
 380                 size -= result;
 381                 buf += result;
 382                 total += result;
 383         } while (size > 0);
 384
 385         if (usbip_dbg_flag_xmit) {
 386                 if (!in_interrupt())
 387                         pr_debug("%-10s:", current->comm);
 388                 else
 389                         pr_debug("interrupt  :");
 390
 391                 pr_debug("receiving....\n");
 392                 usbip_dump_buffer(bp, osize);
 393                 pr_debug("received, osize %d ret %d size %d total %d\n",
 394                          osize, result, size, total);
 395         }
 396
 397         return total;
 398
 399 err:
 400         return result;
 401 }
 402 EXPORT_SYMBOL_GPL(usbip_recv);
 403
 404 struct socket *sockfd_to_socket(unsigned int sockfd)
 405 {
 406         struct socket *socket;
 407         struct file *file;
 408         struct inode *inode;
 409
 410         file = fget(sockfd);
 411         if (!file) {
 412                 pr_err("invalid sockfd\n");
 413                 return NULL;
 414         }
 415
 416         inode = file_inode(file);
 417
 418         if (!inode || !S_ISSOCK(inode->i_mode)) {
 419                 fput(file);
 420                 return NULL;
 421         }
 422
 423         socket = SOCKET_I(inode);
 424
 425         return socket;
 426 }
 427 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 428
 429 /* there may be more cases to tweak the flags. */
 430 static unsigned int tweak_transfer_flags(unsigned int flags)
 431 {
 432         flags &= ~URB_NO_TRANSFER_DMA_MAP;
 433         return flags;
 434 }
 435
 436 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 437                                   int pack)
 438 {
 439         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 440
 441         /*
 442          * Some members are not still implemented in usbip. I hope this issue
 443          * will be discussed when usbip is ported to other operating systems.
 444          */
 445         if (pack) {
 446                 spdu->transfer_flags =
 447                         tweak_transfer_flags(urb->transfer_flags);
 448                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 449                 spdu->start_frame               = urb->start_frame;
 450                 spdu->number_of_packets         = urb->number_of_packets;
 451                 spdu->interval                  = urb->interval;
 452         } else  {
 453                 urb->transfer_flags         = spdu->transfer_flags;
 454                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 455                 urb->start_frame            = spdu->start_frame;
 456                 urb->number_of_packets      = spdu->number_of_packets;
 457                 urb->interval               = spdu->interval;
 458         }
 459 }
 460
 461 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 462                                   int pack)
 463 {
 464         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 465
 466         if (pack) {
 467                 rpdu->status            = urb->status;
 468                 rpdu->actual_length     = urb->actual_length;
 469                 rpdu->start_frame       = urb->start_frame;
 470                 rpdu->number_of_packets = urb->number_of_packets;
 471                 rpdu->error_count       = urb->error_count;
 472         } else {
 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 struct usbip_iso_packet_descriptor*
 640 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 641 {
 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         iso = kzalloc(size, GFP_KERNEL);
 648         if (!iso)
 649                 return NULL;
 650
 651         for (i = 0; i < np; i++) {
 652                 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 1);
 653                 usbip_iso_packet_correct_endian(&iso[i], 1);
 654         }
 655
 656         *bufflen = size;
 657
 658         return iso;
 659 }
 660 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 661
 662 /* some members of urb must be substituted before. */
 663 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 664 {
 665         void *buff;
 666         struct usbip_iso_packet_descriptor *iso;
 667         int np = urb->number_of_packets;
 668         int size = np * sizeof(*iso);
 669         int i;
 670         int ret;
 671         int total_length = 0;
 672
 673         if (!usb_pipeisoc(urb->pipe))
 674                 return 0;
 675
 676         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 677         if (np == 0)
 678                 return 0;
 679
 680         buff = kzalloc(size, GFP_KERNEL);
 681         if (!buff)
 682                 return -ENOMEM;
 683
 684         ret = usbip_recv(ud->tcp_socket, buff, size);
 685         if (ret != size) {
 686                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 687                         ret);
 688                 kfree(buff);
 689
 690                 if (ud->side == USBIP_STUB)
 691                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 692                 else
 693                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 694
 695                 return -EPIPE;
 696         }
 697
 698         iso = (struct usbip_iso_packet_descriptor *) buff;
 699         for (i = 0; i < np; i++) {
 700                 usbip_iso_packet_correct_endian(&iso[i], 0);
 701                 usbip_pack_iso(&iso[i], &urb->iso_frame_desc[i], 0);
 702                 total_length += urb->iso_frame_desc[i].actual_length;
 703         }
 704
 705         kfree(buff);
 706
 707         if (total_length != urb->actual_length) {
 708                 dev_err(&urb->dev->dev,
 709                         "total length of iso packets %d not equal to actual "
 710                         "length of buffer %d\n",
 711                         total_length, urb->actual_length);
 712
 713                 if (ud->side == USBIP_STUB)
 714                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 715                 else
 716                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 717
 718                 return -EPIPE;
 719         }
 720
 721         return ret;
 722 }
 723 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 724
 725 /*
 726  * This functions restores the padding which was removed for optimizing
 727  * the bandwidth during transfer over tcp/ip
 728  *
 729  * buffer and iso packets need to be stored and be in propeper endian in urb
 730  * before calling this function
 731  */
 732 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
 733 {
 734         int np = urb->number_of_packets;
 735         int i;
 736         int actualoffset = urb->actual_length;
 737
 738         if (!usb_pipeisoc(urb->pipe))
 739                 return;
 740
 741         /* if no packets or length of data is 0, then nothing to unpack */
 742         if (np == 0 || urb->actual_length == 0)
 743                 return;
 744
 745         /*
 746          * if actual_length is transfer_buffer_length then no padding is
 747          * present.
 748          */
 749         if (urb->actual_length == urb->transfer_buffer_length)
 750                 return;
 751
 752         /*
 753          * loop over all packets from last to first (to prevent overwritting
 754          * memory when padding) and move them into the proper place
 755          */
 756         for (i = np-1; i > 0; i--) {
 757                 actualoffset -= urb->iso_frame_desc[i].actual_length;
 758                 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
 759                         urb->transfer_buffer + actualoffset,
 760                         urb->iso_frame_desc[i].actual_length);
 761         }
 762 }
 763 EXPORT_SYMBOL_GPL(usbip_pad_iso);
 764
 765 /* some members of urb must be substituted before. */
 766 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 767 {
 768         int ret;
 769         int size;
 770
 771         if (ud->side == USBIP_STUB) {
 772                 /* the direction of urb must be OUT. */
 773                 if (usb_pipein(urb->pipe))
 774                         return 0;
 775
 776                 size = urb->transfer_buffer_length;
 777         } else {
 778                 /* the direction of urb must be IN. */
 779                 if (usb_pipeout(urb->pipe))
 780                         return 0;
 781
 782                 size = urb->actual_length;
 783         }
 784
 785         /* no need to recv xbuff */
 786         if (!(size > 0))
 787                 return 0;
 788
 789         ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
 790         if (ret != size) {
 791                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 792                 if (ud->side == USBIP_STUB) {
 793                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 794                 } else {
 795                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 796                         return -EPIPE;
 797                 }
 798         }
 799
 800         return ret;
 801 }
 802 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 803
 804 static int __init usbip_core_init(void)
 805 {
 806         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
 807         return 0;
 808 }
 809
 810 static void __exit usbip_core_exit(void)
 811 {
 812         return;
 813 }
 814
 815 module_init(usbip_core_init);
 816 module_exit(usbip_core_exit);
 817
 818 MODULE_AUTHOR(DRIVER_AUTHOR);
 819 MODULE_DESCRIPTION(DRIVER_DESC);
 820 MODULE_LICENSE("GPL");
 821 MODULE_VERSION(USBIP_VERSION);