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